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Description  |
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BACKGROUND AND SUMMARY OF THE INVENTION
The invention is in the field of devices which use vacuum, air flow, brush
and electrical charge dissipating action to remove dust and other
particles and to remove static electricity from phonograph records and the
like. It is particularly concerned with portable battery powered devices
for doing this efficiently and inexpensively.
There are various prior art devices for cleaning phonograph records.
Examples are described in Taylor, et al, U.S. Pat. Nos. 3,005,223;
3,150,401; and 3,654,660, and a device of this type is made by VOR
Industries of California under the name VAC-O-REC. These prior art devices
typically have a housing into which the record is partly inserted through
a record slot. The record is supported in the housing on its edge at three
points and is frictionally driven for rotation at one of them. Brushes
along the slot center the record, and an electrically conductive strip of
foil in the housing contacts the record to dissipate electrical charge
from it. An electrical motor connected to a household current outlet
rotates the record and also drives a vacuum blower to pick up dust from
the record and the brushes. Such prior art devices may not have sufficient
versatility, low cost or ease of use in certain cases. For example, these
prior art devices must be connected to a household current outlet, which
limits their choice of location and makes them less convenient to move
from place to place. Moreover, some types of dirt on records, such as
grease or fingermarks, can not be removed effectively by these prior art
devices, but must be removed by separate washing of the records. This is
inconvenient, and may also result in danger if a wet record is cleaned
with such prior art devices, this danger being the possibility of an
electric shock at household outlet voltage. In addition, these prior art
devices, so far as known to applicant, work well only with the regular
size LP records since they support the record edge at three fixed points.
In view of this prior art, there is a need for a record cleaning device
which is highly portable, can be used at any location and can be easily
moved from place to place, a device which in many cases can clean by
itself dirt, such as grease and finger marks from records, without the
danger of electrical shock of the user, a device which can work well with
records of the several common sizes without any resetting, a device which
can effectively remove static charge, and a device with these
characteristics which would be inexpensive to make and maintain and would
be convenient to use. This invention is directed to providing a device
meeting such needs.
One specific embodiment of the invention is a device which comprises a
housing enclosing a cleaning chamber. The housing has an elongated record
slot through which a record is at least partly inserted into the cleaning
chamber. A pair of cleaning brushes flank the record slot along the
forward part of its length. The brushes contact and engage portions of the
opposite sides of the record inserted in the slot. The brushes, which can
be made of foam material, can be moistened with a record cleaning solution
to help clean the record. In addition, each of the brushes is easily
removable for washing and can then be replaced with a fresh edge facing
the record. Alternately, a new brush may be conveniently installed. A pair
of jaws grip each brush but expose one of its long edges to face and
contact the record. The jaws are easily removable from the housing, and
from each other, to free the brush for cleaning or replacement, and easily
reassemble and reconnect to the housing.
The part of the record inserted into the cleaning chamber is supported
along its edge by a V-section pulley and a V-section guide. The pulley,
covered with a resilient high friction material, is V-shaped in axial
section, and the record edge fits in the bottom of the V. The record is
supported at a second point, spaced along the record edge from the pulley,
by the V-section guide. The guide and the pulley, both supported in the
housing, flank the center of gravity of the record, and can support
records of various sizes without any readjustment of the device. The
pulley is driven by a battery powered electric motor via a drive belt to
thereby rotate the record about its normal axis. The motor is in the rear
of the housing, with its shaft extending transversely between the
sidewalls of the housing. The same motor drives a vacuum blower, for
vacuuming the record portion which is in the housing. The batteries for
the motor are in the base of the housing.
The exemplary device embodying the invention has a pair of air inlets in
the sidewalls of the housing, which inlets are spaced from the record slot
and flank the sides of the record portion which is in the housing. Air is
drawn into the cleaning chamber through the air inlets as well as perhaps
through the record slot. There is an air outlet at the rear of the housing
for the exiting air. The airflow created by the blower thus enters the
cleaning chamber through the air inlets and perhaps the record slot, picks
up dust and other particles from the record portion which is in the
cleaning chamber, and exits through the air outlet at the rear of the
housing.
The housing also encloses a static charge dissipating strip which is in the
cleaning chamber and has a slit along part of its length to receive and
contact the part of the record which is in the cleaning chamber. The strip
may be a single piece of resilient, electrically conductive material such
as aluminum coated resilient plastic sheet (e.g., Mylar) which is
connected to a floating electrical ground to discharge static charge that
may be on the record.
In operation, the battery powered motor drives the V-section pulley to
rotate the record inserted in the cleaning chamber. As the record rotates,
the brushes rub against, or at least contact, the respective sides of the
record to remove or at least dislodge dust or other particles that may be
on the record. The dust or other particles are drawn away from the brushes
and the record by the air flow created by the blower, which is also driven
by the same motor. Static electrical charge that may be on the record is
dissipated as the record rotates by the static charge dissipating strip.
The brushes, which may be made of liquid absorbing material, may be
moistened, e.g., with record cleaning fluid, to help remove or dislodge
particles and to help remove grease and finger marks or other such matter
that may be on the record. The brushes can be conveniently removed for
washing, and may be reinstalled with a different, fresh edge, facing the
record, or the entire brush may be easily replaced. Since the device is
battery operated it can be installed anywhere and can be conveniently
moved from place to place. Moreover, there is no danger of an electric
shock to the user. Because of the efficient operation of the device, the
battery drain is low while the cleaning action is thorough.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a phonograph record cleaner in accordance
with the invention.
FIG. 2 is a partly elevational and partly sectional side view thereof.
FIG. 3 is a partial sectional view taken along 3--3 of FIG. 2.
FIG. 4 is a partial sectional view taken along 4--4 of FIG. 2.
FIG. 5 is a partial sectional view taken along 5--5 of FIG. 2.
FIG. 6 is a partial sectional view taken along 6--6 of FIG. 2.
FIG. 7 is an exploded perspective view of a cleaning brush and brush jaws
forming a part of the record cleaner of FIG. 1.
DETAILED DESCRIPTION
Referring to FIGS. 1 and 2, a record 10 is partly inserted into the housing
12 of a record cleaner which forms one embodiment of the invention. The
lower portion of the record 10 enters the housing 12 through an elongated
slot 14 and is supported within a cleaning chamber 16. The bottom edge of
the record rests at the notch of a V-shaped pulley 18 (FIGS. 2 and 5) and
the notch of a guide 20 (FIGS. 2 and 4). The pulley 18 is rotated as
described below to slowly turn the record 10 about its normal axis of
rotation. As the record 10 rotates, its grooved sides rub against brushes
22 and 24, which help remove or dislodge dirt on the record and may be
moistened, as with record cleaning fluid, to help clean grease, finger
marks and other matter from the record. Additionally, there is an air flow
created as described below of air which enters the interior of the housing
12 through intake slots 26 and 28 (FIGS. 1 and 4), and perhaps through the
record slot 14 as well and exits the housing 12 through an air outlet 30.
Still additionally, a static removing strip 32 (FIGS. 2 and 3), which is
electrically conductive and is suitably electrically grounded, rubs
against the grooved sides of the record 10 and picks up static electricity
that may be on the record. The record 10 rotates about its axis for one or
more complete revolutions so that its entire grooved surfaces may be
thoroughly cleaned.
When the record 10 is inserted in the housing 12 as indicated in FIGS. 1
and 2, its bottom edge is centered with respect to the record slot 14
because it rests at the notches of the pulley 18 and the guide 20 and
because it is flanked by the brushes 22 and 24, as best seen in FIG. 4,
and by a pair of guides of which only a guide 33, removably secured in a
slot 34, is visible in FIG. 1. A corresponding guide removably secured in
a corresponding slot is disposed opposite the guide 33, behind the record
10 as viewed in FIG. 1. The guide 33 and its counterpart are made of a
soft material, such as felt, and are closer to each other than the facing
sides of the record slot 14 such that the record 10 is kept from touching
the hard plastic material of the record slot 14 but touches instead only
the guides 33 and the brushes 22 and 24.
The brushes 22 and 24 are secured to the housing 12 such that they can be
easily removed for cleaning or replacement. In particular, referring to
FIGS. 4 and 7, the brush 24, which is in the form an elongated bar of
square cross section, is gripped between jaws 34 and 36 such that one of
its long edges is exposed and the exposed edge faces a corresponding
exposed edge of the other brush 22. The entire brush assembly comprising
the brush 24 and the jaws 34 and 36 can be taken apart by hand as
indicated in FIG. 7 and can be put back together by aligning the pegs 36a,
36b and 36c extending from a flange 36d of jaw 36 and corresponding holes
34a, 34b and 34c in a corresponding flange 34d of jaw 34 and pressing the
two jaws toward each other such that the pegs enter the holes. The flanges
34d and 36d then slide in a frictional fit in a corresponding channel 38
(FIG. 4) where they are held in a frictional fit. The entire brush
assembly can be removed by pushing the jaws or the pin 36b toward the
other brush assembly such that the flanges 34d and 36d slide out of the
channel 38. When taken apart as illustrated in FIG. 7, the brush 24 may be
washed to remove dirt that it may have picked up, and the brush assembly
may be reassembled with a different long edge of the brush 24 facing
toward the other brush. The entire brush 24 may also be replaced. The two
brush assemblies are identical so that the brush assembly including the
other brush 22 need not be described again. The brush 24 may be made of a
liquid absorbing material such as urethane foam so that it can be
moistened with a record cleaning solution to facilitate cleaning and so
that it can easily be washed.
Referring to FIGS. 2 and 5, the record is supported and is centered with
respect to the record slot 14 by the pulley 18 and the guide 20. The
pulley 18 is additionally used to drive the record for rotation about its
normal axis. As seen in FIG. 5, the pulley 18 is V-shaped in axial
section, and the part engaging the record is covered with a high friction
material such as a wide rubber band stretched over the V-shaped portion of
the pulley. The pulley 18 is rotated about its axis by a motor 38 whose
shaft 40 has affixed to it a driving pulley 42. The pulley 42 drives
another pulley 44 via a drive belt 46. The pulleys 44 and 18 are affixed
to the same shaft 48 journaled at suitable supports 50 and 52 affixed to
the housing 12.
As best seen in FIGS. 2 and 6, the bottom edge of the record 10 is also
supported at a guide 20 which has a V-shaped notch receiving the record
edge, and has pegs 20a and 20b journaled at supports 54 and 56 secured to
the housing 12. The V-shape of the pulley 18 and the guide 20 center the
record 10 properly and the fact that the record is supported at only two
points and that the guide 20 is journaled for free rotation at supports 54
and 56 help the device accomodate records of different sizes without any
adjustments. The guide 20 is made of a low friction material, such as
Delron, and this plus the fact that it can rotate freely help provide a
built-in floating adjustment of the record cleaner to records of different
sizes.
In addition to the cleaning action due to the brushes 22 and 24 wiping the
grooved sides of the record, there is an air flow which impinges on the
grooved sides of the record portion that is in the cleaning chamber and
exits from the device carrying dirt and other particles. As best seen in
FIG. 2, this air flow is created by a cage fan 58 affixed to and rotating
with the shaft 40 of the same motor 38 which drives the V-shaped pulley
18. The cage fan 58 rotates within a housing 60 which has an opening 62
communicating for air flow with the cleaning chamber 16 and has an exhaust
chute for directing air drawn from the cleaning chamber 16 out of the
exhaust opening 30. The main part of the air flow enters the cleaning
chamber 16 through the air intake slots 26 and 28 (FIG. 4).
Static electricity from the record is removed with the help of an
electrically conductive resilient strip 32 which, as best seen in FIGS. 2
and 3, is disposed within the cleaning chamber 16 and has a central slit
64 to receive the record 10. The strip 32 is made of a material such as an
aluminum coated Mylar, and is held in place by being affixed to supports
66, 68, 70 and 72 affixed to the housing 12. As best seen in FIGS. 3 and
4, the long outside edges of the strip 32 are pinched between relatively
rigid plastic strips 74, 76, and 78, 80 secured as shown in the supports
66-72. These supports having facing slots into which the strips 74, 76 and
78, 80 are held in frictional fit such that the strip 32 can be easily
inserted in place and can be removed for replacement if necessary. The
strip 32 is electrically connected by means of a wire 82 to one pole of
batteries 84, 86 (FIG. 2), which are connected electrically with the motor
38 through an off-on switch 88.
In operation of the device described above, a record 10 is inserted in the
record slot 14 as indicated in FIGS. 1 and 2 such that its edge rests on
the pulley 18 and the guide 20 as indicated in FIGS. 5 and 6. The motor 38
is then turned on by connecting the batteries 84, 86 to it through switch
88. The motor 38 drives the pulley 18 to slowly rotate the record 10 and
drives the cage fan 58 to create an air flow entering the cleaning chamber
16 through the air inlets 26 and 28 and perhaps through the record slot 14
and impinging on the grooved sides of the record part which is in the
cleaning chamber 16. The air flow, and any particles carried by it, exit
through the outlet 30. As the record 10 is slowly rotated, its grooved
sides are wiped by the edges of the brushes 22 and 24 which contact, it
and electrical static charge that may be carried by it is dissipated by
the strip 32 which is at the floating electrical ground of one side of the
batteries 84, 86. The record is kept from being scratched at the record
slot 14 by the felt guides 33.
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