 |
Description  |
|
|
The present invention relates to a snap fastener.
In known constructions, the half of the snap fastener which is referred to
as the male part, has the ball formation and a half which is referred to
as the female part has a socket receiving this formation.
The attachment of the two halves of the snap fastener to the supporting
fabric requires additional means which, depending on the purpose of the
snap fastener, is constructed to do the least possible damage to the
fabric, such as, for instance, so-called claw plates. The claws themselves
are pointed and when inserted through the supporting fabric widen the mesh
so that the cutting of the threads is substantially excluded. The free
ends are bent over on the other side of a base plate of the respective
part of the snap fastener. The field of use of such snap fasteners is
extremely large since they fulfill the function of fastening in a very
unobvious manner. As a rule, the male part is anchored flat behind a
covering strip so that the necessity or problem of a direct decorative
covering does not arise here. On the other hand, however, it is also known
to cover the invisible halves of the snap fastener by machine with a
non-removable or permanent decorative cap.
It is an object of the present invention, to provide a snap fastener by a
simple method of manufacture and in the smallest possible structural
height in a manner advantageous to use. This object is achieved in that
the snap fastener whose basic function is to fasten is given, by the
provision of a decorative element, also a decorative function which
remains present when the snap fastener is open and which can be associated
as desired with fashion applications; the holding means necessary for this
purpose are simple, operate reliably, and do not require any additional
parts, but rather are of simpler manufacture than the known snap fasteners
and remain more securely in their position. In addition, the snap
fasteners of the present invention even have; the advantage that they are
easier to apply to the specific articles of use.
According to the present invention, the male part is provided on its top
with a socket to receive and hold a decorative covering part by a
reversible snap connection between the male part and the decorative
covering part.
The top plate of the male part can be provided, extending from the edge
over which known holding claws grip, with an inwardly directed upwardly
bent section, the flanged edge of which forms the central socket opening.
One favorable feature of the invention is that the section extends up in
the form of a conical frustum.
In accordance with the invention this the section extends upwardly in
stepwise manner.
The invention furthermore proposes that the edge of the central opening be
formed with individual barb-like tongues which extend obliquely downwardly
into the opening in order to obtain an irreversible fastening of the
decorative covering part.
Another advantageous embodiment consists in accordance with the invention
in the female part also having a plug-in type socket for holding a
decorative covering part.
Thus each snap-fastener part can be provided individually on its one broad
side with a female opening and on the opposite broad side with a male
projection which is adapted for locking in the female opening. The male
projection can bear the decorative covering.
It is advantageous, in accordance with the invention, for the male
projection to be anchored in a hollow in the decorative part and have a
central opening for the entrance of a centering pin of the decorative
part.
A claw like anchoring is provided between the outer surface of the pin and
the tongues of the male projections.
The small projection can extend from a plate which is of smaller area than
the decorative part and which has on its edge holding claws which engage
over the bottom plate which bears the female opening. Both the male
projection and the female opening should be formed of elastically
resilient individual tongues.
One favorable feature of the invention is that the centering pin extends
conically towards the free end.
In this connection it is advantageous in accordance with the invention that
both the female part and the male part have masking tops of identical
shape which are coupled by a push-and-turn bayonet connection with a
holding part fastened to the fabric and which form the central
snap-fastener socket which is closed in the case of the male part by a
decorative element which is snapped into it.
Furthermore, the invention provides that the mask upper part be provided
with outwardly directed wings which extend from the socket wall and with
which there are associated passage openings in the upper plate of the
holding part, supporting shoulders which are gripped by the wings and
extend in the circumferential direction of the top plate adjoining such
passage openings.
Another advantageous embodiment is provided in accordance with the
invention in that the wings are alternately staggered in height and
alternately grip above and below the supporting shoulders.
The supporting shoulders can be formed of the upwardly bent inner-wall
annular zone of the upper plate.
One favorable feature of the invention is that the downward bent edge of
the masking top can rest on the supporting material.
In this connection it is advantageous in accordance with the invention that
at least the upper plate of the holding part of the male part and of the
female part be of in the same shape.
The invention furthermore proposes that the claw plate of the male part
continue into the snap-fastener button.
Still another advantageous development of the invention is provided by the
fact that the mask upper part has turn-gripping projections on its outer
surface.
Finally, it is favorable in accordance with the invention for the mask
upper part to extend as a cover up to above the bent claws of the claw
plate.
As a result of such development, a snap fastener of increased value is
created. While retaining the previous function of a fastener, there is now
added, with minimum structural height, the favorable decorative function,
such that the decorative covering part can even serve as ordinary button
which can replace the conventional sewn button. The decorative cover part
also serves as gripping means for the fastener. As a result, no unusual
manipulations occur. The structural members are maintained extremely
simple. The male part is provided on top with an insertion socket in order
to hold the decorative cover part. The reversible snap connection between
male part and the decorative cover part which is employed results in a
large number of advantages: Firstly there is a wide range of variations
for the decorations which can be applied. The possible loss of the
decorative cover part is no difficulty since the cover part is rapidly
replaced. If this decorative cover part serves a button function, resewing
is unnecessary. Upon drycleaning or washing, the decorative cover part can
if necessary be detached from the male part in order to protect it --
depending on the nature of its surface, its type of material, etc. -- from
possible damage due to strong mechanical or chemical action. The snap
fastening as such, however, is also advantageous since small tilting
movements of the connected parts are compensated for without impairing the
security of the fastening. The snap fastening is effected in the manner
that the top plate of the female part, extending from the edge over which
the conventional holding claws grip, has an inwardly directed upwardly
raised section whose flanged edge forms the central socket opening. The
upward displacement of the flanged edge also makes it possible, despite a
compact shape, to improve the entrance into the socket also from an
optical standpoint. The frustoconical shape of this section which is
selected results, together with the flanged edge, in excellent
stabilization, so that very thin material can be used, which in its turn
benefits the small structural height desired. The same purpose is also
served by the measure of developing the section in step shape. The
corresponding step can be placed so far into the region of the edge that
it terminates directly in front of the pointed ends of the holding claws
which grip over the edge of the upper plate of the male part. Since the
step also extends over the thickness of the holding claws, advantageous
protection is obtained from direct mechanical action, for instance the
bending of said claws. However, a favorable irreversible mounting of the
decorative part is also possible in accordance with the invention if the
edge of the central opening is shaped into individual barb-like tongues
which extend obliquely downward into the opening. This solution has the
advantage that the corresponding association of the decorative cover part
can be carried out without the use of tools. For example, for the
reversible or irreversible adding of a second or inner head, the female
part can also have an insertion socket to hold this button or the
decorative cover part.
In order to obtain still further advantages with respect to application to
corresponding articles of use, and particularly articles of clothing, the
two base parts of the snap fastener which are to be fastened to each other
can be shaped in the same manner. This greatly simplifies manufacture. The
number of operations for the production of the entire snap fastener is
reduced. In addition to a saving of tools, simplified assembly is also
obtained since, in addition to the decorative part, there are only two
different structural parts which can be used both for the one part of the
snap fastener and for the other. To this end, each male projection fits in
interlocking manner in each female opening. This also results in
advantages in shipment, as well as sale. Snap-fastener top parts as well
as snap-fastener bottom parts can be stored without regard to whether they
are to be used subsequently as the male part or the female part. This
possibility of storage results in advantages also with respect to the
application of the snap fasteners by machine to the articles of use. The
expense is substantially reduced in particular in the case of articles of
clothing. Separate arrangement as well as separate storage is no longer
necessary; both parts of the snap fastener can be associated by machine
with the article of clothing, namely on both overlapping sections of the
clothing, regardless of the subsequent manner of buttoning. This not only
results in the advantage that the female part and the male part cannot be
confused so that improperly produced articles occur, but, on the contrary,
with the same arrangement of the structural parts both on men's and on
women's clothes, the customary manner of buttoning can be determined
subsequently. The decorative cover part will then be associated with the
outside part of the snap fastener; by the development in accordance with
the invention, it is possible, despite unsorted arrangement of the
snap-fastener parts on the overlapping sections of clothing, to associate
the decorative cover part in each case with the outwardly facing section
of the corresponding snap-fastener part, depending on the manner of
buttoning, regardless of whether this snap-fastener part serves as male
part or as female part extends into the decorative part. The decorative
part, which is preferably made of plastic, can remain free of thin-walled
sections when the fastening section of the male part extends into the
female part. The interlock between the decorative cover part and the male
projection takes place in stable fashion, and the material of the
decorative part need not be elastic; the evasive movement for the
interlocking is effected by the elastic deflection of the tongues of the
male projection. By this measure, even rigid decorative parts of metal can
be used, depending on the article of clothing. The decorative part comes
into a favorable locking position as a result of the centering.
The conical shape of the pin has various advantages. On the one hand the
possibility of evasion for the male projection is provided in the first
detent section, while on the other hand in the final detent position the
pin lies in properly fitting manner in the central opening of the male
projection. In this way a very stable connection is obtained. In order to
pull the decorative cover part off from the male projection, for instance
so that the decorative part will not be subjected to mechanical or
chemical action upon the cleaning of the article of clothing, there are
thus required forces which considerably exceed the detent forces of the
detent point between the male part and the female part. The decorative
cover part thus forms a true gripping handle which can be loosened only
intentionally but cannot come loose unintentionally, i.e. during
disengagement of the male and female parts. The form-fitting insertion of
the center in this even produces the advantage of a claw-gripping by the
tongues. The decorative cover part is fixed fast against rotation. In
addition to the advantages of technique of use, an optically pleasing
solution is also created. The decorative part not only completely covers
the male part, but even extends over it, so that from the outside only the
decorative element is visible.
There are also advantages with regard to the reliability in use. The
elastic development of the two detent means of a snap-fastener part for
interlocking between the snap-fastener part serving as male part and as
female part respectively results in a uniform distribution of the
pressures for the obtaining of the interlock position. The forces are
distributed uniformly over both sections, which increases the operating
life of the interlocking means with an extremely simple development which
is saving of material. The firmness of the interlocked position is not
impaired thereby.
The reversible associating of a decorative element results in a large
number of advantages. With suitable development, for instance, the
male-side opening is closed by a decorative element which is snapped into
place. When the decorative cover part serves as button in conventional
sense, there is the advantage that all articles of clothing can be
equipped with the same snap fastener on the same attaching machine and the
decoration applied only before the packing of the article of clothing.
This results in advantages in storage and fabrication. The female part can
also serve to receive a decorative part without closure function. As
further essential advantage, there is the easy mounting by the final
consumer. The previous rivet-like association of the structural parts
which clamp the fabric between them is eliminated. Thus even the mask top
can be removed and replaced by another one. By loosening the mask top, the
serrated ring becomes accessible. It can be taken off by the final
consumer or the garment maker -- if it has been mechanically damaged or
attached at the wrong place -- and replaced by a new snap fastener. The
snap fastener is extremely durable and resistant to mechanical forces. As
a result of the structural measure that the masking tops has outward
directed wings extending from the wall of the socket opening, with which
wings there are associated passage openings in the upper plate of the
holding part which can furthermore be used for both parts of the fastener,
adjoining which passage openings there are supporting shoulders which grip
over the wings and extend in the circumferential direction of the top
plate, precisely defined associated starting and end positions are
established. This forms a favorable prerequisite for the automatic
associating of the snap-fastener parts on the supporting material. If the
wings are even alternately staggered in height so that they extend above
and below the supporting shoulders, a fastening between the masking top
part and the holding part which withstands practically all customary axial
pressures is produced. The supporting shoulders are advantageously formed
by the upward bent inner-edge annular zone of the upper plate. It is also
desirable that the downward bent edge of the masking top part rest on the
supporting material. With equal resting on the edge side of the
correspondingly curved edge zone there is also obtained a protective
covering of the claws of the claw plate which fixes the holding part on
the supporting material. The gripping projections on the cylindrical
surface of the mask top part which are finally proposed also favor the
automatic associating of the snap-fastener parts on the supporting
material.
Further advantages and details of the invention will be explained below
with reference to several illustrative embodiments shown in the drawing in
which:
FIG. 1 shows the male part of the snap fastener,
FIG. 2 shows the decorative covering part by itself,
FIG. 3 is a section along the line III--III of FIG. 1,
FIG. 4 shows the female part of the snap fastener,
FIG. 5 is a section along the line V--V of FIG. 4,
FIG. 6 shows the male part in accordance with the second embodiment,
FIG. 7 is a section along the line VII--VII of FIG. 6,
FIG. 8 shows a female part in accordance with the second embodiment,
FIG. 9 shows a male part in accordance with the third embodiment,
FIG. 10 is a section along the line X--X of FIG. 9,
FIG. 11 is a top view on another modified embodiment of the female part,
FIG. 12 is a section along the line XII--XII of FIG. 11,
FIG. 13 shows a fifth variant of the female part,
FIG. 14 is a bottom view of a snap-fastener part in accordance with the
sixth embodiment,
FIG. 15 is a longitudinal section through the corresponding decorative
cover part,
FIG. 16 is a longitudinal section through the snap-fastener part of the
sixth embodiment, serving here as male part,
FIG. 17 is a longitudinal section through the snap-fastener part serving as
female part,
FIG. 18 is a top view of a snap-fastener part,
FIG. 19 shows the interlock between female and male as well as decorative
cover parts of the sixth embodiment, with particular showing of the
optional use as female part or male part,
FIG. 20 shows the decorative element of a seventh embodiment,
FIG. 21 is a corresponding section through the male part of the snap
fastener in accordance with the seventh embodiment,
FIG. 22 is a section through the female part,
FIG. 23 is a vertical section through the snap fastener of the seventh
embodiment, shown in interlocked position,
FIG. 24 is a bottom view of the mask upper part,
FIG. 25 is a cross section along the line XXV--XXV of FIG. 24,
FIG. 26 is a top view of the mounting part,
FIG. 27 is a cross section along the line XXVII--XXVII of FIG. 26,
FIG. 28 is a top view of the claw plate,
FIG. 29 is a side view thereof,
FIG. 30 shows the claw plate in a different form than that shown in FIG.
29, and
FIGS. 31 and 32 show variants of a non-detachable snap fastening between
decorative element and snap fastener.
The snap fastener of the first embodiment of the invention shown in FIGS. 1
to 5 consists of the male part P and the female part M, as well as a
decorative cover part Z adapted to be associated with the snap fastener.
A top plate 21 forms a part of the male part P. This plate is fastened to
the supporting material 9 by a claw plate 3 which simultaneously forms the
snap-fastener button 4. The holding claws 16 of this plate 3 pass through
the supporting material 9 and are so bent at their end that they extend
over the edge 22 of the top plate 21. The edge 22 extends parallel to the
supporting material 9.
The central region of the top plate 21 is raised upward, i.e. it lifts off
from the supporting material 9. The upward raised section is designated
23. The inner edge 24 of this section is flanged over and forms a central
detent opening 5 for a pin-like detent projection 6 of the decorative
covering part Z made, for instance, of plastic. This detent projection 6
is undercut, as can be noted from FIG. 2. In order to facilitate the
making of the snap connection, it can be hollowed out in its entire depth
in the region of its pin-like projection so as to produce in this way a
highly elastic pin-wall section. The bottom of the pin-like detent
projection 6 is kept flat. Its side or annular surface terminates shortly
in front of the supporting material 9. The bottom of the decorative cover
part Z, which in this case is of mushroom shape, is hollowed out so that
the edge of this part covers the holding claws 16, hiding them and
protecting from contact with them.
The section 23 has the course approximately of a conical frustum. Due to
this and due to the flanged edge 24 which describes the insertion socket
5, the top plate 21 of the male part P is stabilized in itself.
However, as shown by the male part of FIG. 10, this section can also be
raised up in stepwise manner. The corresponding step is marked 23' and
lies directly in front of the tip 16' of the radially inwardly directed
holding claws 16.
Instead of the reversible association of the decorative cover part Z which
has been described, an irreversible attachment can also be brought about
if the inner edge 24 which surrounds the central opening 5 is provided, in
order to form individual tongues acting like barbs, the radial separating
sections 26, preferably extending up into the region of the frustoconical
section 23, as shown in the second embodiment in accordance with FIGS. 6
to 8. These tongues 25 are bent at an angle at the vertex 27 so that they
have an obliquely downward inclined direction and thus extend into the
opening 5. The tongue ends, which are preferably sharp-edged, describe a
circular opening. The diameter of said opening is smaller than the
diameter of the detent projection 6 of the decorative covering part Z,
which projection is in this case preferably cylindrical. The detent
projection is possibly slightly undercut. Due to the fact that the bottom
of the decorative cover part Z rests on the annular rib formed by the
peaks 27 of the tongues 25 and the ends of the tongues moreover dig into
the wall of the detent projection 6', an extremely stable irreversible
attachment is obtained between male part P and decorative cover part Z.
As can be noted from FIG. 5, the snap-fastener button 4, which in this
embodiment is made flexible by slitting it, is introduced, in order to
produce the fastening, into an insertion socket 5 of the female part. In
this case the same top plate 21 as in FIG. 3 is used. The only thing
different is that in this case the claw plate 3 is closed in the center.
In FIG. 8 the female part is modified in the manner that herein the claw
plate 3 forms the central insertion socket 5 for the snap-fastener button,
while the top plate 21, which in this case faces downward, forms the
central opening 5 for a decorative cover part Z which is to be
irreversibly associated with the female part. The manner of operation of
this top plate 21 has been explained above.
The embodiment of FIG. 10 provides a snap-fastener button which is rigid,
i.e. not radially elastic, which once again is integral with the claw
plate 3. In contrast to this, the upward facing claw plate 3 in FIG. 12 of
the female part is adapted to the requirements of elastic action, in that
the flanged edge 28 forming the insertion socket 5 for the snap-fastener
button 4 has radial slits 30 extending to the step 29. The top plate 21
which is facing downward in FIG. 12 corresponds to the manner of
construction already described in FIG. 10. It serves to apply a decorative
cover part Z to the female part.
The development of FIG. 13 differs from that of FIG. 8 merely by the fact
that the claw plate 3 which is located on top has associated with it an
annular plate 31 which is gripped by the holding claws.
In the embodiment shown in FIGS. 14 to 19, the snap fastener also consists
of two structural parts 50, 51 necessary for the purpose of the fastening,
each of which individually, as shown in FIG. 19, can serve alternately as
male part P or as female part M. In the embodiment shown in the drawing,
the part 50 is to be considered as male part P and the part 51 as female
part M.
Aside from these parts, the snap fastener also has a decorative cover part
Z which can be associated with it. The parts 50, 51 are of identical
development, each by itself having a claw plate 3, in this case located on
the top, and a bottom plate 52, the claw plate 3 bearing the upward
directed, undercut male projection 53 serving as snap-fastener button,
which projection has tongue-like, elastic sections as a result of vertical
slots extending up into the plane of the claw plate and has a central
opening 54 on the top. The bottom plate 52 in this case has an upward
raised section 23 which forms the female opening 55 whose inner edge 24 is
flanged; the upward raised section 23 also forms elastic tongues as a
result of slits extending up into the plane of the bottom plate.
Depending on the use made on given articles, the upward raised section 23
may also be developed without slits, in which case the yielding movement
for the interlocking is then provided solely by the tongues of the male
projection.
Each part 50 or 51 is fastened in the following manner to the corresponding
sections 56 and 57 respectively of the supporting material 9: The claw
plate 3 is pressed on the outside against the supporting material so that
the mounting claws 16 which are directed opposite to the male projection
53 pass through the supporting material; the bottom plate 52 is then
placed on the other side of the supporting material in the annular space
formed by the holding claws 16 and gripped by thereupon bending over the
ends of the holding claws in such a manner that the claw plate 3 and the
bottom plate 52 are clamped against each other with the interposition of
the supporting material 9.
The male projections 53 are in this case adapted for interengagement with
the female openings 55, i.e. the male projection of the part 50 fits in
locking fashion in the female opening of the part 51, but the male
projection of the part 51 also fits in the female opening of the part 50.
The ornamental part Z is provided with a correspondingly shaped cavity 58
for interlocking with the male projection 53 of the corresponding male
part P. The male projections 53 of the two parts 50, 51 fit into this
cavity 58.
From the roof 58' of the cavity 58, a downward conically tapering centering
pin 59 extends centrally. The pin 59 is so dimensioned that its larger
cross section located in the vicinity of the roof fits in form-fitting
fashion in the central opening 54 of the male projection in interlocked
position with the male projection.
Aside from the cavity 58, the decorative cover part Z also has a recess 60
on its bottom, which recess is adapted to the shape of the claw plate 3;
when the decorative cover part Z is in engaged position with the male
projection 53, the recess 60 receives the claw plate 3 in such a manner
that it is invisible from the outside.
As already mentioned, FIG. 19 shows the possibility of using the parts 50,
51 either as male part P or as female part M. The solid lines show the
part 50 in the position serving as male part P. The part 51 in this case
forms the female part M.
With due consideration of the different manners of buttoning in particular
women's and men's garments, the parts 50, 51 can also be so arranged that
the part 50 which is associated with the section 56, as shown in dash
line, serves as female part M. The decorative part Z would in this case be
engaged with the male projection 53 of the part 51, which in this case
lies on top.
For an arrangement of the decorative part on the male projection in which
it also engage by claw action in axial direction, the edges of the central
passage opening 54 of the male projection 53 can also be flanged inward,
as indicated in FIG. 19 by the reference number 100.
A further embodiment, shown in FIGS. 20 to 29, also has male part P, female
part M, and a decorative element Z.
The components of the male part P as well as of the female part M are in
this embodiment in each case one masking top part 1, a holding part 2, and
a claw plate 3. The masking top parts 1 are of identical development.
The holding parts 2 are also of the same development.
The claw plates 3 are also of the same development with regard to their
specific function; the claw plate 3 associated with the female part M is
merely continued into a centrally located snap-fastener button 4. The
latter cooperates with the correspondingly centrally located snap-fastener
socket 5 of the masking top part 1 of the female part M.
The corresponding socket 5 of the male-side masking top part 1 is closed by
the detent projection 6 of the snap-in decorative element.
The decorative element consists of plastic or in any event of material of
sufficient flexibility. The pin-like detent projection is undercut
corresponding to the oblique course of the wall 7 of the socket. In order
to facilitate the introduction of the snap engagement, the projection 6
over a portion of its length has a cavity 8 extending from the face end.
It leads to a highly elastic annular bead 6' which continues in the last
third of the length of the button into the solid and thus also more
resistant button section. The bottom of the decorative element Z is flat
so as to obtain a snug fit thereon on the masking upper part 1. As can be
seen, the cap-shaped, button-like decorative element Z extends over the
masking upper part 1 which can be adapted in color and structure to
whatever is desired. As a result of the protrusion, the decorative element
Z can also be used as handle or directly as button if the holding force of
the detent projection 6 is greater than of the snap-button detent force.
The dish-shaped masking upper part 1 is associated with the holding part 2
which is fastened by means of the claw plate 3 to the supporting material
9 by the reversible insert-and-turn connection. For this purpose wings 10
protrude from the retracted detent socket wall 7. The wings are directed
outward. As shown in FIG. 24, the masking upper part has a total of four
such wings. They are distributed at equal angles apart but alternately
displaced in height so that the wings 10 pass above and below supporting
shoulders 11 of the upper plate 12 of the holding part 2. The upper plate
12 has two passage openings 13 which take into consideration the contour
of two diametrically opposite wings 10 and extend from a central opening
3'. For the coupling of the two parts 1 and 2, the lower wings 10 are
aligned with the openings 13, inserted and turned 45.degree.. In this
connection the bottom wings 10, i.e. the wings furthest away from the
decorative element Z, move over detent projections 14 produced by pimples,
so that their narrow edges 10' lying in direction of rotation come against
end stops 15 which are also produced by pimples. In the engaged position,
the wings are held secured against rotation at both narrow edges 10' and
10" between the pimples which are a corresponding distance apart from each
other.
The upper plate 21 which forms the shoulders 11 is obtained by indenting
the central section of the holding part 2. The depth of indentation
corresponds approximately to the thickness of the wings, so that the
bottom of the wings terminates on the same plane as the bottom of the
holding part 2. On this plane there also terminates the edge 1' bent over
the point of fastening between the holding part 2 and the claw plate 3,
which edge rests by means of the end surface 1" on the supporting material
9. The end surface 1" can also be bent outward in order to protect the
supporting material.
The claw plate is provided on its circumference with uniformly distributed
pointed claws 16. The latter are obtained by tabs which are cut out freely
and then bent upward. The claw points 17 are rounded so that when the
supporting material is fabric, these claws pass through the supporting
material, with a widening of the meshes, and are then bent over in the
direction towards the holding part, their tips 17 then coming into
position directly in front of the bend 18 forming the supporting shoulders
11.
The claw plate associated with the male part P differs from the claw plate
associated with the female part M only by the fact that the claw plate 3,
as already mentioned, continues into the centrally located snap-fastener
button 4. The latter is plotted crosswise. The corresponding slitting 19
is continued up into the region of the claw plate 3. The button 4 is also
undercut by a corresponding course of the wall of this embossed button so
that it cooperates with the wall 7 of the masking upper part which is
undercut with the same angle. The face end of the button 4 is left open.
In the case of the claw plate 3 associated with the female part M, the
central region is punched out, as a result of which the supporting
material 9 can still move away somewhat.
It is advantageous, particularly for the completely automatic associating
and connecting of the masking upper parts with the holding parts 2, if
mounting markings or grip projections 20 are provided on the outer surface
of these masking upper parts. They can be taken into consideration upon
the embossing and furthermore be used to facilitate the opening of the
push-and-turn connection by hand. Holding parts can also advantageously be
provided with projections to assure automatic feeding in correct position.
The central snap-fastener socket 5 can also be developed polygonally,
particularly, for instance, for the aligning of decorative emblems, or
else for the automatic mounting in correct position and the transmission
of the rotary fastening forces.
In accordance with the variants of FIGS. 31 and 32, the decorative part Z
is provided for the interlocking with the snap-fastener projection 53 of
the claw plate 3 with an undercut cavity 58 having a central,
mushroom-shaped pin 59'. The tabs of this projection 53 which are cut free
by cross-slotting down to the base of the claw plate 3 are bent inward and
then bent back, for instance, in the direction towards the plate 3. For
the claw-holding action, the tabs come below the edge of the pin obtained
as a result of the mushroom-shaped thickening.
In this connection the relatively rigid outer wall of the cavity 58 forms
the peripheral supporting surface. In order to make possible passage
through the annular space of the cavity which is of smaller cross section,
the bent-back tabs move for a short time away and then come in barb-like
fashion below the edge of the mushroom. The narrow pass in the case of the
embodiment shown in FIG. 31 is overcome essentially by plastic deformation
of the end-thickened pin and slight removal of material on same and on the
wall of the cavity and, in the case of the embodiment shown in FIG. 32,
essentially by the slit pin in this case which can be compressed in the
elastic region by the amount necessary for the passage of the snap-button
projection 53. In both cases pushing-in is readily possible by hand. By
the oblique position of the flanged projection tabs shown in the drawing,
an undetachable connection is obtained. Pulling forces which act on the
decorative part Z result in an increase in the effect of the action of the
claws. The tabs are pressed even firmer into the undercut base of the
cavity.
While we have disclosed several embodiments of the present invention it is
to be understood that these embodiments are given by example only and not
in a limiting sense.
* * * * *
|
|
 |
|
 |
Description |
|
