 |
Claims  |
|
|
We claim:
1. A compact, telescoping telephone instrument, comprising:
a first composite housing configuration having an internal hollow, said
housing having a top surface recess containing a dialer mechanism for
initiating telephone calls, a bottom surface at a given angle with respect
to said top surface with a plurality of apertures on said bottom surface,
a telephone audio component located in said hollow and having a surface
communicating with said apertures, said housing having an opened front
end, a closed back end and closed side surfaces,
a first guide means located on the opposite side of said top surface and
within said hollow and relatively parallel to said side ends to provide a
first path for guiding a slide member from said opened front end towards
said back wall, second guide means located on the opposite side of said
bottom surface and within said hollow for providing a second path in the
same direction as said first path for guiding a slide member from said
opened front end towards said back wall,
a slidable housing member comprising a first hollow section at a first end
for containing within said hollow another telephone component, said
housing having a right and a left slide member extending from said first
section at a second end with said members relatively parallel one to the
other and platform means positioned between said members to align and
position the same, each of said members having a top surface configuration
adapted to coact with said guide means to enable said slidable housing to
move towards said back wall of said first housing, and said members
further having a bottom surface configuration coacting with said second
guide means to further enable said slidable housing to move in the same
direction, whereby said slide members as coacting with said first and
second guide means permits said slidable housings to slide towards and
away from said back wall to thereby cause said another telephone component
to be positioned closer to or further away from said dialer according to
the movement of said slidable housing.
2. The telephone instrument according to claim 1 wherein said first
composite housing comprises a top housing section having a top surface
recess for containing said dialer with an open bottom, a bottom housing
section having a bottom surface at said given angle with an opened top
relatively congruent to said open bottom of said top housing section and
means for securing said top section to said bottom section with said open
bottom and said open top communicating to form said internal hollow, with
said top housing section containing said dialer mechanism, and said bottom
housing section containing said telephone audio component.
3. The telephone instrument according to claim 1 wherein said opened front
end of said first composite housing contains a flange extending upwardly
from said bottom surface, and means located on said platform of said
slidable member adapted to coact with said flange to prevent dislodging of
said slidable housing from said composite housing.
4. The telephone instrument according to claim 1 wherein said first guide
means located on the opposite side of said top surface and within said
hollow comprises a first flange extending from said opened front end
towards said back wall and spaced a predetermined distance from a first
side surface to form a first guide channel therebetween, a second flange
extending from said opened front end towards said back wall and relatively
parallel to said first flange to form a second guide channel with said
opposite side surface.
5. The telephone instrument according to claim 4 wherein said slidable
housing includes on said top surface thereof a first and second projection
spaced apart one from the other at a distance determined by said first and
second guide channels and each adapted to ride in an associated channel to
cause said slidable housing to slide from said opened front end towards
said back wall.
6. The telephone instrument according to claim 1 wherein said second guide
means located on the opposite side of said bottom surface includes a third
flange extending from said opened front end towards said back wall and
spaced a predetermined distance from a first side surface of said first
housing, and a fourth flange extending in the same direction as said third
flange and parallel thereto and spaced from said other side surface by
said predetermined distance.
7. The telephone instrument according to claim 6 wherein said platform
means positioned between said slide members includes first and second
channels located at each side and located between the juncture of said
slide members and said platform for coacting with and riding within said
third and fourth flanges.
8. The telephone instrument according to claim 1 wherein said first section
of said slidable housing has a sloping top surface at a given angle from
the horizontal with said surface sloping from a top side to a bottom side
and relatively in a plane opposite to the said angled bottom surface of
said first housing, said sloping top surface of said first section having
a plurality of apertures for communicating with said telephone component
with said respective angled surfaces of said first section and said bottom
surface presenting an optimum receive/talk condition to a user of said
instrument.
9. The telephone instrument according to claim 1 wherein said given angle
of said bottom surface is approximately twelve degrees with respect to the
horizontal plane.
10. The telephone instrument according to claim 8 wherein said given angle
of said sloping top surface of said slidable housing is about twenty-one
degrees with respect to the horizontal plane.
11. The telephone instrument according to claim 1 wherein said telephone
audio component located in said first composite housing is a telephone
receiver.
12. The telephone instrument according to claim 1 wherein said telephone
audio component located in said slidable housing member is a carbon
telephone transmitter.
13. A compact, telescoping telephone instrument, comprising:
a first housing (B) having a top surface and an opened bottom surface, said
top surface having a recess for containing a dialer mechanism, first and
second sidewalls and a back wall extending from said top surface to form
an enclosure for said mechanism, said bottom surface of said housing (B)
having first and second channels parallel to each other and extending from
a opened front end towards said back wall, with each channel associated
with and located a predetermined distance frm said an associated sidewall,
a second housing (A) having a sloping top surface including a plurality of
apertures, first and second sidewalls and a back wall, with an opened
bottom surface, said sidewalls and back walls as surrounding said open
bottom surface relatively congruent to said sidewalls and back walls of
said first housing to permit said first housing to be emplaced over said
second housing, to form a hollow recess therebetween, with said second
housing containing a telephone audio component communicating with said
apertures in said sloping top surface, with said top surface sloping from
said back walls of said housings as emplaced towards said opened front
end, said second housing (A) having located beneath said top surface and
within said hollow first and second flanges directed from said opened
front end towards said back wall and each separated from an associated
sidewall by a predetermined distance,
a third slidable housing (C) adapted to be inserted in said opened front
end of said first and second emplaced housings, said third housing
containing a first hollow section for containing another audio component
and having first and second elongated side rail assemblies extending from
a surface of said first section and relatively parallel one to the other,
with a top surface of said side rail assemblies adapted to coact with and
be guided by said first and second channels in said first housing (B) and
with a bottom surface of said side rail assemblies adapted to coact with
and be guided by said first and second flanges of said second housing (A)
to permit said housing (C) to slide with respect to said first and second
housings (A and B),
means coupled to said third housing (C) to limit the distance said housing
(C) slides with respect to said first (B) and second (A) housings.
14. The telephone instrument according to claim 13, further including:
a central boss depending from the bottom of said back surface of said first
housing (B) and having an aperture located thereon.
15. The telephone instrument according to claim 14
wherein said sloping top surface of said second housing has an aperture
therein for communicating with said aperture in said central boss when
said first housing (B) is placed in congruency with said second housing
(A), fastening means inserted in said apertures of said boss and said
sloping surface for securing said first housing (B) to said second housing
(A).
16. The telephone instrument according to claim 15 wherein said third
slidable housing (C) further includes a platform positioned between said
first and second elongated side rail members to provide support thereto
while rigidly positioning the same.
17. The telephone instrument according to claim 16 wherein said platform
includes a central aperture adapted to encircle said fastening means to
allow said slidable housing (C) to move freely.
18. The telephone instrument according to claim 13 including means coupled
to said slidable housing (C) operative to limit the movement of said
housing (C) when said housing (C) is slid away from housings (A) and (B).
19. The telephone instrument according to claim 13 wherein said sloping top
surface of said second housing (A) is at an angle of about twelve degrees
with respect to the horizontal plane.
20. The telephone instrument according to claim 13 wherein a top surface of
said first hollow section is at a predetermined angle, with said surface
containing a plurality of apertures, said angle and hence the slope of
said surface directed opposite to said sloping top surface of said second
housing (A), wherein said telephone audio components have respective
portions physically facing each other to provide a convenient
receiver/transmit path for a user.
21. The telephone instrument according to claim 20 wherein said
predetermined angle of said top surface of said first hollow section is
about twenty degrees with respect to the horizontal plane.
22. The telephone instrument according to claim 13 further including a
circuit board located in the hollow formed when said first housing (B) is
emplaced in congruency with said second housing (A).
23. The telephone instrument according to claim 13 wherein said audio
component in said second housing (A) is a telephone receiver component.
24. The telephone instrument according to claim 13 wherein said other audio
component in said slidable housing (C) is a carbon transmitter. |
|
 |
|
 |
Claims |
|
|
|
Description |
|
|
BACKGROUND OF THE INVENTION
This invention relates to telephone sets and more particularly to a compact
telephone set employing a telescoping housing configuration for simple and
reliable use.
There are many existing telephone sets which are available to the public
and they are all different designs and shapes according to the aesthetic
preferences of the user.
Basically, a telephone set must include a transmitter, a receiver and for
selective communication, a dialer. As such, practical telephone sets
embody other features such as two-way operation and ringing. Components
employed in telephone sets have been greatly improved and presently are
extremely rugged and reliable. The carbon transmitter is widely used in
such sets as it is comparatively inexpensive and serves both to amplify
energy and as an acoustic-electric converter. The modern telephone set
also includes a number of circuits which are used for supervision. Among
these are the switch hook which, among other things, closes the battery
circuit when the handset of the phone is removed from the base. This
powers the transmitter and actuates a relay to indicate a service request,
or to connect the telephone line associated with the set to a dialing
register. The functions performed by the telephone set are fairly well
known in the prior art and are associated with great reliability.
There has been a desire in the prior art to provide telephone sets which
tend to be smaller and more compact than the typical desk phone. These
sets have the convenience of being easy to handle, have aesthetic appeal
and take up a minimum amount of space.
One such instrument is designated as a flip phone and basically is a one
piece telephone set which is connected to the operating company phone
network by means of a coiled cord with modular jacks on each end. The
instrument is placed on line by lifting the same up from a horizontal
surface. The lifting action operates a spring activated plate which
rotates outwardly from the underside of the phone set. Dialing is
accomplished by depressing a keyboard (touch tone). Conversation is
maintained by holding one's ear to the concave receiver section and
speaking at the plate which is part of the rotatable assembly. Speech is
reflected from the plate into a condensor microphone situated at the hinge
or pivot end of the telephone set where the plate and body of the phone
meet. The phone is "hung-up" or disconnected by repositioning the same on
the horizontal surface, while being careful to allow the plate to fold
back under the body of the phone.
The phone is quite compact but is associated with certain disadvantages
which offset reliability and operation. The phone employs a cone speaker
and condensor microphone as transmitting and recieving components. Such
elements are more susceptible to damage during typical use than the carbon
microphone and typical receiver components in present phones.
The phone requires the user to dial while the plastic foldout plate is
pointed in the direction of the user and the user is required to "talk at"
a plate or flat surface rather than into a perforated transmitter
enclosure. This phone is extremely susceptible to false "hang-ups" as when
it is put down, it is disconnected and hence, a conscious effort on the
part of the user is not necessary to hang-up.
In view of these factors and others, it is seen that the operation of such
an instrument is quite different from the standard telephone set and the
differences are disturbing and confusing to a user.
Other prior art telephones employed a sliding arrangement where a
transmitter and receiver and dialer are all located in a unitary housing.
Upon sliding or extending the housing, one activated the phone to the
"off-hook" status and by collapsing or returning the housing, one
initiated the "on-hook" or hang-up mode.
In any event, such instruments were unreliable in that the mechanical
assemblies were unstable and complicated and provided difficulty in
operation and reliability due to construction techniques.
There is a need for a compact and reliable
There is a need for a compact and reliable telephone set which is capable
of accommodating standard phone company receiver and transmitter
components, while being compact and smaller in size than conventional
instruments. The instrument provides a telescopic housing which must be
extended for "off-hook" operation and retracted for "on-hook" conditions.
This requires a conscious effort on the user's part to place the phone in
operation and is consistent with present phone subset operation. The
phone, when extended in the "off-hook" mode, provides a proper mouth to
ear length ratio to accommodate all users and includes an ordinary
receiver and transmitter to enable one to converse using the instrument
much as the handset on the conventional instrument.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A compact telescoping telephone instrument, comprising a first composite
housing configuration having an internal hollow, said housing having a top
surface recess containing a dialer mechanism for initiating telephone
calls, a bottom surface at a given angle with respect to said top surface
with a plurality of apertures on said bottom surface, a telephone receiver
located in said hollow and having a surface communicating with said
apertures, said housing having an opened front end, a closed back end and
closed side surfaces, first guide means located on the opposite side of
said top surface and within said hollow and relatively parallel to said
side ends to provide a first path for guiding a slide member from said
opened front end towards said back wall, second guide means located on the
opposite side of said bottom surface and within said hollow for providing
a second path in the same direction as said first path for guiding a slide
member from said opened front end towards said back wall, a slidable
housing member comprising a first hollow section at a first end of
containing within said hollow a telephone transmitter, said housing having
a right and a left slide member extending from said first section at a
second end with said membersrelatively parallel one to the other, and
platform means positioned between said members to align and position the
same, each of said members having a top surface configuration adapted to
coact with said first guide means to enable said slidable housing to move
towards said back wall of said first housing, and said members further
having a bottom surface configuration coacting with said second guide
means to further enable said slidable housing to move in the same
direction, whereby said slide members as coacting with said first and
second guide means permits said slidable housing to slide towards and away
from said back wall to thereby cause said transmitter to be positioned
closer to or further away from said receiver and dialer according to the
movement of said slidable housing.
BRIEF DESCRIPTION OF THE DRAWINGS
Above-mentioned and other features and objects of this invention will
become more apparent by reference to the following description taken in
conjunction with the accompanying drawings, in which:
FIG. 1 is a top perspective plan view partially in cross section of a
telephone instrument according to this invention.
FIG. 2 is a bottom perspective view partially in cross section of the
instrument of FIG. 1.
FIG. 3A is a bottom view of a housing (B) containing a dialer keyboard.
FIG. 3B is a side view of the housing (B).
FIG. 4A is a bottom view of a slidable transmitter housing (C).
FIG. 4B is a top view of the housing of FIG. 4A.
FIG. 4C is a front view of the housing of FIG. 4B.
FIG. 4D is a side view of the housing.
FIG. 5A is a front view of a receiver housing (A).
FIG. 5B is a top view of the housing of FIG. 5A.
FIG. 5C is a bottom view of the housing of FIG. 5A.
FIG. 6 is a side diagrammatic view of the telephone instrument of FIGS. 1
and 2 in an extended or off-hook position.
FIG. 7 is a partial cross sectional view taken through line 7--7 of FIG. 6
and depicting the guide mechanisms between housings A,B and C.
FIG. 8A is a diagrammatic view showing the telephone instrument in an
on-hook position depicting an opened hook switch position.
FIG. 8B is a diagrammatic view of the telephone instrument in an off-hook
position depicting closure of the hook switch.
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, there is shown a perspective view of a telescoping
telephone set 10 according to this invention. As previously indicated, a
modern telephone receiver usually includes a transmitter, a receiver and a
dialing assembly. The telephone set 10 of FIG. 1 basically consists of
three housings.
A first housing A includes the telephone receiver which is conventional
receiving element found in conventional modern day phone sets and is an
extremely reliable component. The housing A is mounted relatively rigidly
with respect to a top housing section B. The top housing section B
contains a touch tone dialer assembly 11. As is known, the assembly 11
consists of a plurality of keys or buttons which bear the digits 0-9 and
is of the configuration found on conventional instruments used for dialing
telephone numbers. The unit 11 is available as a standard component or
keyboard from many sources and upon actuation or any of the buttons
associated with the keyboard 11, a touch tone frequency signal is
transmitted over the telephone lines to initiate dialing pulses for a
called number. Slidably mounted in relation to housings A and B is the
housing C. The housing C contains a carbon microphone or transmitter also
of conventional design and as employed in present day telephone
instruments.
Referring to FIG. 2, there is shown a bottom perspective view of the
instrument in FIG. 1 where the housings have been indicated by the same
letters, A, B and C. As can be seen from FIG. 2, the receiver housing has
a concave receiving area 12 which is held to the ear of a user and which
enables him to place the instrument directly over his ear with the
perforations included in area 12 directing the sound from the receiver.
The transmitter housing C also contains a plurality of perforations 14
indicative of a transmitting region to enable the user to speak directly
therein during conversation.
Hence, it is immediately ascertained from FIGS. 1 and 2 that the unit
consisting primarily of housings A,B and C will enable one to conduct
conversation in a relatively ordinary manner and according to the
techniques employed in a conventional instrument. It can be seen from
FIGS. 1 and 2 that housings A and C possess transverse surfaces which
provide a given angular relationship between the plane of the receiver
contained in housing A with the plane of the transmitter contained in
housing C. The angle depicted as RA associated with housing A is about
12.degree., while the angle RC associated with housing C is about
21.degree.. This enables a user to conduct an ordinary conversation
without the necessity of concentrating on directing his voice into the
transmitter section C. The above described angles provide an optimum
relationship between the receiver and the transmitter to enable one to
carry on a convenient conversation.
The instrument depicted in FIGS. 1 and 2 is partially extended. As
indicated, the housing A is rigidly secured with respect to housing B
during assembly. The transmitter housing C is slidably mounted with
respect to housings A and B. A user, by grasping housing C may withdraw
housing C in the direction of the arrow 15 to extend the same in a fully
opened position which, as will be explained, is indicative of an off-hook
position. When housing C is retracted or moved in the direction of arrow
16, the subset assembly 10 is in a closed position or on-hook condition.
In this position, the front flange 17 associated with housing B is in
alignment with the edge 18 of housing C and the instrument assumes, in
this position, the smallest volume.
The instrument is approximately 21/2" wide. The housing B is approximately
6" long and hence, the dimension of the instrument 10 is approximately 6"
long when in the closed position. The maximum height of the instrument is
about 11/2". When the instrument is in its extended position where the
transmitter housing C is fully retracted in the off-hook mode, the
effective length of the instrument increases by about 2" and hence, the
overall length is about 8". Based on the above dimensions, it is
therefore understood that the instrument depicted in FIGS. 1 and 2 is
extremely compact, while capable of performing each and every function of
the conventional telephone.
Also shown in FIGS. 1 and 2 is a terminal aperture 20 for insertion therein
of a coiled telephone cord with modular jacks on each end to permit
coupling of the instrument to a conventional telephone line.
Before proceeding with a detailed explanation of the mechanical structure,
a brief description of the simplicity of operation of the instrument 10 is
believed to be warranted. Essentially, the instrument 10 is placed on line
or in the off-hook position by retracting housing C which contains a
carbon microphone. The retracting of the housing C actuates two leaf
spring switches which alternately place the phone on line and allow the
last number dialed to be recorded and redialed by the touch of a single
button on the key pad 11. When the phone is in the extended position as
above, the key pad 11 is activated and the buttons located thereon can
accommodate normal dialing. The user engages in conversation by holding
recess 12 associated with housing A to his ear and by talking into the
transmitter perforations 14 associated with housing C. The phone is hung
up or rendered in its on-hook position by sliding housing C into housings
A and B. It is not necessary to push section C completely closed as the
switch configuration to be described places the phone in the on-hook
condition when housing C is still extending a relatively small amount,
which distance as will be explained, can be varied.
It is understood that when the instrument 10 is in its on-hook condition,
it can receive a ringing signal from the telephone line. The instrument
contains internal circuitry which upon receipt of a ringing signal, will
activate a buzzer contained on a circuit board, to be described, and
hence, affords an audible tone to the user indicative of a ringing signal.
Referring to FIG. 1, it is seen that a portion of housing B is shown in
broken view. Located on the undersurface of housing B is a flange guide
member or wall 21. The wall 21 extends a predetermined distance back
towards the dialer assembly 11. The wall 21 forms a slot with the side
wall 22 of the housing B. A projection or tab 23 is rigidly positioned on
housing C. Another projection 24 also exists on the left side of housing C
and is relatively identical in configuration as projection 23. This
projection 24 also rides in a channel or slot formed by an additional
flange as 21A located on the other side of housing B. Thus, housing C when
emplaced with respect to housings A and B, has two tabs 23 and 24 which
are guided and ride in the channels formed by the flange 21 and the side
walls of the housing B. The projections 23 and 24, as can be ascertained,
function as stop mechanisms and hence, aid in preventing a user from
withdrawing the housing C from housings A and B.
Referring to FIG. 3A, there is shown a top view depicting walls 21 and 21A
and the slots formed with the corresponding side walls as 22 and 22A of
the housing B. FIG. 3B shows a side view of the housing B and shows the
surface upon which the dialer assembly 11 is mounted.
It is also seen in FIG. 3B that there is an extending flange or lip 30
which secures the rear portion of housing B to housing A when the
instrument 10 is assembled.
Referring to FIG. 2, thee is also shown a partial section taken through
housing A and a partial section taken through housing C. The housing C
essentially consists of a transmitter section 14 which, as indicated
above, contains a standard carbon microphone. The microphone used in a
normal receiver is about 11/2" or more in diameter and is generally
circular in configuration. The receiver is about the same size.
The housing C is formed from a suitable plastic by a molding operation.
Essentially, the housing contains two extending side rail assemblies
designated as 31 and 32. The side rail assemblies are joined together at a
front end by a platform 33. Platform 33 has a slot 34 located thereon,
which slot accommodates a single screw 35, which screw extends via an
aperture in housing A into a threaded boss 36 located on housing B (FIG.
3A). This single screw 35 firmly secures the entire assembly together.
The housing C essentially has two slots or channels 40 and 41 located on
each side of the platform 33. These slots are formed by one wall of the
slide channels 31 and 32 and by a wall of the platform 33. If reference is
made to FIGS. 4A to 4D, there is shown respectively a top, bottom, front
and side view of the housing C. The slots or members 40 and 41 are
accommodated by a flange as 45 located on a corresponding surface of
housing A. The flange 45 is similar to flange 21 associated with housing B
and extends along housing A to accommodate the slide members 31 and 32 of
housing C together with slots 40 and 41 formed between the slide members
31 and 32.
Referring to FIGS. 5A to 5C, there is shown a side, top and bottom view of
the housing A. The wall 45 and the corresponding wall 45A on the other
side are clearly shown in FIG. 5A.
As can be seen from FIG. 2, the member C is accurately guided by means of
the slots 40 and 41 and the walls of the slide members 31 and 32. These
are accurately aligned and controlled in movement by means of the flanges
45 and 45A formed in the receiver housing A.
Also seen in FIGS. 2 and 5 is the fact that the slide channel members 31
and 32 also ride in the slots 50 formed between the flange 45A and the
side wall of housing A. The slots 50 and 50A further assure a reliable
guide for the movable transmitter housing C.
As indicated, the slot 34 in the platform 33 serves to accommodate the
screw 35 which is secured in aperture 56 of housing A and as indicated,
serves to couple housing A to housing B (FIG. 3) via the threaded aperture
in the boss 36. Accordingly, the extendable housing C is guided and
maintained in accurate and reliable position with the housings A and B by
means of three distinct mechanical assemblies. Namely, as shown in FIG. 1,
the projections 23 and 24 associated with housing C are positioned to ride
in the channels located in housing B and formed between the side walls 22
and 22A and the extending flanges 21 and 21A. These projections 23 and 24
assure that the bottom surface of the extendable housing C is accurately
controlled. The top surface of the housing C is accommodated by means of
the slide members 31 and 32 and the slots 40 and 41 (FIG. 4) which are
accommodated by the flanges 45 and 45A of housing A (FIG. 5) and the
channels 50 and 50A formed between the extending flanges 45 and 45A and
the side walls of housing A. The slot 34 in the platform 33 serves further
to permit sliding of the housing by providing a passageway for the screw
35 which secures housing A to housing B.
Also shown in FIG. 5C is a lip or flange 47, which flange accommodates the
upstanding flange 30 of housing B securing housing A to housing B when
they are in alignment. The aperture 56 of housing A permits insertion of
the screw 35 therein to further secure housing A to housing B via the
threaded boss 36.
As seen from FIG. 5B, the front surface of housing A which contains the
recess 12 is covered by means of an attractive vinyl sheet 48 and hence,
the top of the screw 35 when inserted in aperture 51, is not visible but
can be accessed by lifting of the vinyl.
The platform 33 of housing C further includes two extending projections 51
and 52. The projections 51 and 52 coact with the underside of housing A
and further prevent the housing C from being withdrawn from the assembly.
Thus, these upstanding flanges 51 and 52 serve together with the
projections 23 and 24 on the other surface of housing C to assure that the
housing C cannot be removed or extended beyond the limits imposed by the
above noted mechanical restraints. The platform 33 serves to provide great
rigidity to housing C and in order to maintain the extending slide members
31 and 32 in a relatively rigid position.
Hence, as can be seen from the above, when the housings A,B, and C are
emplaced and held in position by the single screw 35, the transmitter
housing C can be extended and retracted at will. It is completely guided
on both top and bottom surfaces by the corresponding flanges and channels
and hence, will operate extremely reliably independent of the type of
motion a user may attempt or actually impart to the housing C when it is
in the process of being pulled out or pushed in as the telephone is being
used. The fact that the housing C is guided both on the top and bottom
surfaces enables extremely reliable operation of the instrument 10 over
prolonged periods of use. This, of course, is an important aspect for any
telephone instrument as the typical life of such instruments is for many
years of operation.
Referring to FIG. 6, there is shown a cross sectional side view of the
housings A,B and C. FIG. 6 is a diagrammatic view showing the housing C in
a fully extended position. The dashed line shows the housing C in a
retracted position. As can be ascertained from FIG. 6, when the housing is
fully extended, both projections 24 and the tab 51 prevent further
movement of the transmitter housing C from housings A and B.
Referring to FIG. 7, there is shown a cross sectional view taken through
line 7--7 of FIG. 6. FIG. 7 shows the relationship of the various
projections as 23 and 24 on housing C as well as the slide members 31 and
32 and how they are accommodated within the associated slots of housings A
and B. Accordingly, there has been described a rigid mechanical assembly
permitting one to withdraw and insert housing C to enable on-hook and
off-hook operation of the telephone assembly 10 in a rapid and reliable
manner. The mechanical assembly thus depicted assures that the housing C
can be pulled out and pushed in reliably and without concern over lateral
or extraneous forces that might be imparted to the assembly by a typical
user and under the many different conditions which a telephone set would
be subjected to during conventional use.
The above described configuration affords great mechanical stability while
providing an extremely compact and practical instrument. As can be
ascertained from FIG. 4, the transmitter housing C has a first hollow
section which accommodates an ordinary carbon microphone used in a
conventional telephone instrument. FIG. 5 depicts the housing A which
contains a receiver unit also of the type employed in a conventional
telephone system. Accordingly, the compact phone above described enables
one to employ conventional receivers and transmitter modules which have
been developed, tested, and used for many years and are extremely
economical and reliable in operation.
Housing B, as shown in FIG. 3, has a recess or section for accommodating a
conventional touch tone keyboard 11 which, as indicated, is also a
commercially available component and of the type employed in conventional
telephone instruments.
SUPERVISION OPERATION OF THE TELEPHONE UNIT 10
As above indicated, apart from the receiver, transmitter and dialer, a
telephone instrument such as 10 is required to perform certain operations
generally designated as supervisory operations. The telephone above
described serves immediately to be placed in the off-hook condition when
the housing C is extended to the position, for example, shown in FIG. 6
with respect to housings A and B. In order to operate in the off-hook
condition, one must provide a closed circuit to the telephone lines
connected to the instrument. In this manner, a current is supplied to the
instrument from the battery located at the central office. The flow of
this current indicates to the central office that the instrument is busy.
It is, of course, understood that a busy condition could mean that the
instrument is being used for conversation as it is part of an existing
call either as a called or a calling party or that the instrument is
requiring service or is dialing and so on. In any event, a conventional
receiver uses a hook switch which operates when a hand set is lifted from
a cradle or from the base assembly of a telephone. This switch action
must, of course, be provided in the above described telephone instrument.
Referring to FIG. 3A, there is shown a printed circuit board 60. The
printed circuit board 60 contains various components to enable the
telephone set 10 to operate properly. As such, the printed circuit board
contains a ring detector, which circuit serves to detect a ringing signal
impressed on the telephone lines when the instrument is being accessed.
The detector serves to actuate a buzzer or other device also located on
the printed circuit board. Tbe board contains other conventional
components which are found in most telephones such as a side tone circuit
and varistor devices to limit the amplitude of the transnitted and
received signal. Such devices are well known and exist in most
conventional telephones. The particular phone described herein also
contains integrated circuit modules which enable the storage of a
telephone number where that number may be automatically retrieved for
immediate dialing by the depression of a key associated with keyboard 11.
Such techniques are well known in the telephone art and are not considered
part of this invention and therefore, further discussion of the same will
be limited.
The circuit board 60 also interfaces with the keyboard 11 and has a circuit
for converting the depression of a key into suitable signals indicative of
dialing pulses or dialing frequencies for operation over a conventional
telephone line. In this manner, the keybord 11 is connected to the printed
circuit board 60 by means of a suitable flat ribbon conductor. The printed
circuit board 60 is included in the hollow between housings A and B and
also interfaces with the transmitter and receiver modules contained in
housings A and C. Located on the printed circuit board when it is properly
positioned between housings A and B are two leaf type switches.
Referring to FIG. 8A, there is shown a first switch 70 which is opened when
housing C is in the on-hook position with respect to housings A and B. The
switch 70 is mounted on the printed circuit board 60 and sits with its
contact in the normally opened position when housing C is in the off-hook
position. Not shown but directly on the opposite side of the printed
circuit board 60 is an additional switch in relatively the same position
on the circuit board as switch 70.
Shown in FIG. 8A is a tab 71. The tab 71 is located and rigidly secured to
the bottom edge of the extending slide member 31 associated with housing
C. Referring to FIG. 4A, there is shown the tab 71 which extends from the
slide member 31. Adjacent tab 71 is another tab 72 which is secured to
member 32. It is noted that tabs 71 and 72 are displaced one with respect
to the other. Essentially, as shown in FIG. 4A, tab 72 is located above
tab 71 on the vertical axis. Referring to FIG. 2, tab 71 is again clearly
shown in position.
The printed circuit board 60, as indicated, essentially is located between
housings A and B and basically as shown in FIG. 3A, the printed circuit
board 60 has the switches 70 and 70A located on the underneath side or
bottom surface of the board with the open contact of the switches as 70
facing the top surface of the housing B. The printed circuit board as
located rests or is emplaced between housings A and B by resting on the
tabs as 80 and 80A of FIG. 5C and the printed circuit board 60 as shown in
FIG. 3, has a semicircular aperture on the front side surface which
encircles the central boss 36 associated with housing B (FIG. 3). As
previously indicated, the aperture 56 in housing A accommodates the screw
35 which secures housing A to B when the printed circuit board is
positioned as shown in FIG. 8A.
As the housing C is retracted or moved into its opened position as
designated by arrow 72 of FIG. 8A, the tab 71 coacts with the leaf spring
contact of switch 70 and urges the contact upward to hence close the
switch as shown in FIG 8B. In a similar manner, tab 72 will operate to
close switch 70A. However, due to the locations of tabs 71 and 72 on the
slide members 31 and 32 associated with housing C, switch 70 is closed
prior to switch 70A based on the location of the tabs. As can be
ascertained from FIG. 8B, when the housing C is again pushed in to
housings A and B in the direction of arrow 73, tab 72 releases switch 70A
first and thereafter tab 71 releases switch 70.
In the above manner, one obtains closure as follows: When the telephone is
moved in the position shown in FIG. 8B, tab 71 closes switch 70 before tab
72 closes switch 70A and this occurs in the off-hook position. When
housing C is moved in the position as shown in FIG. 8A or into the on-hook
position, tab 71 releases switch 70 before tab 72 releases switch 70A.
Switch 70A controls the hook switching sensing circuitry associated with
the printed circuit board. Switch 70 shorts a resistor in the tip lead
which provides loop current to the telephone in the off-hook mode. This
loop current must be available before switch 70A closes to allow the
off-hook sensing pin associated with the circuitry contained on the
printed circuit board to detect the current for proper operation.
Hence, as is seen in FIGS. 8A and 8B, one obtains a selective switch
closure when the telephone set is placed in the off-hook position by
moving housing C to the extended position. This sequentially closes
switches 70 and 70A in a sequence which causes switch 70 to close before
switch 70A and causes switch 70A to open before switch 70 when the phone
is placed in the on-hook position. This type of operation is also
available in conventional phones via the hook switch which affords a
delayed operation and hence, such a hook switch in a conventional phone is
actually more difficult to implement than the switching mechanisms
described above.
One can also ascertain that the location of tabs 71 and 72 on the slide
members 31 and 32 of housing C and the placement of switches 70 and 70A on
the printed circuit board determines when the switches will be activated
in regard to the position and traveling of housing C. In this manner, the
respective components can be located so that the full retraction of
housing C is not necessary to activate the switches and hence, the
instrument can be placed in the on-hook and off-hook positions via the
operation switches 70 and 70A within predetermined limits concerning the
position of housing C and hence, housing C need not be fully inserted or
retracted to enable on-hook or off-hook operation.
The electrical control of a telephone circuit via switches 70 and 70A to
provide loop current as well as an activating signal to electrical
circuitry contained on the printed circuit board is a necessary feature in
a telephone instrument and is accurately and reliably supplied to tabs 71
and 72 in activating switches 70 and 70A and the above operation, as
indicated, is extremely effective and reliable.
There has thus been described a telephone instrument of a telescoping type
which is extremely compact, while being mechanically rugged. The
instrument consists of three housings; two of which as housing A and
housing B respectively contain the receiver and dialing components of the
telephone with an interfacing circuit board 60 mounted there between. A
third housing C contains a carbon microphone and is slidably mounted with
respect to housings A and B and as such, is accurately guided therebetween
by means of multiple guide assemblies which enable reliable operation of
housing C to afford on-hook and off-hook operation. The extension and
retraction of housing C within housings A and B activates supervision
switches in a sequential manner to assure that loop current is provided by
the instrument during a call or pursuant t | | |
