U.S. patent number RE30,184 [Application Number 05/957,200] was granted by the patent office on 1980-01-08 for holders for tape cassettes.
This patent grant is currently assigned to IDN Inventions and Development of Novelties AG. Invention is credited to Peter Ackeret.
United States Patent |
RE30,184 |
Ackeret |
January 8, 1980 |
Holders for tape cassettes
Abstract
A housing with one side open to form an entrance for a tape
cassette, a slider within the housing and movable toward and away
from the entrance, a spring pressing the slider toward the
entrance, a latch retaining the spring cassette in the housing
against the pressure of said spring, reel-retaining inserts for
insertion into the hub of the tape spools, the inward and outward
movement relative to the spool hubs being controlled by movement of
the slider in the housing, in certain instances the insert being
mounted on the slider and in other instances the insert being
mounted on the housing.
Inventors: |
Ackeret; Peter (Kusnacht,
CH) |
Assignee: |
IDN Inventions and Development of
Novelties AG (Lenzerheide, CH)
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Family
ID: |
27185958 |
Appl.
No.: |
05/957,200 |
Filed: |
November 2, 1978 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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Reissue of: |
582118 |
May 30, 1975 |
04030601 |
Jun 21, 1977 |
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Foreign Application Priority Data
Current U.S.
Class: |
206/387.12;
312/9.57 |
Current CPC
Class: |
G11B
23/0233 (20130101) |
Current International
Class: |
G11B
23/023 (20060101); B65D 085/672 () |
Field of
Search: |
;206/387 ;312/319 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Moy; Joseph Man-Fu
Attorney, Agent or Firm: Palmatier; H. Dale
Claims
What we claim is: .[.1. A holder for tape cassettes and the like,
the holder comprising a housing having at least one compartment
with an open front side to slidably receive a slider in the
compartment, a slider in the housing and adapted to linearly
transport a cassette into and out of said compartment, the slider
having a cassette-engaging rear wall spaced inwardly from said open
front side of the housing and the slider having an open and
unobstructed front side permitting removal of the cassette from the
slider by sliding movement and without tilting, stop means to limit
the length of sliding movement of said slider, locking means being
provided to hold the slider in its compartment against the force
exerted by a spring in the housing and urging the slider into its
open position, and cassette reel retention members brakingly
engaging into the cassette reel apertures when said slider is
locked, said retention members being pivotable in a plane
perpendicular to the direction of sliding in response to and upon
movement of the slider into its open position thereby
disengaging from said reel apertures..]. 2. A holder .[.according
to claim 1, in which.]. .Iadd.for tape cassettes and the like, the
holder comprising a housing having at least one compartment with an
open front side to slidably receive a slider in the compartment, a
slider in the housing and adapted to linearly transport a cassette
into and out of the compartment, the slider having a
cassette-engaging rear wall spaced inwardly from said open front
side of the housing and the slider having an open and unobstructed
front side permitting removal of the cassette from the slider by
sliding movement and without tilting, stop means to limit the
length of sliding movement of said slider, locking means being
provided to hold the slider in its compartment against the force
exerted by a spring in the housing and urging the slider into open
position, and cassette reel retention members brakingly engaging
into the cassette reel apertures when said slider is locked, said
retention members being pivotable in a plane perpendicular to the
direction of sliding in response to and upon movement of the slider
into its open position thereby disengaging from said reel
apertures, .Iaddend.the reel retention members are on the slider
and extend toward the open front side of the housing from said rear
wall, said reel retention members being pivotable within the
housing to tilt out of the reel apertures, and the housing being
divided by means of ribs projecting inwards from walls of the
housing into two chambers, said ribs extending toward the open
front side and parallel to the direction of sliding movement of the
slider and cassette, the first of said chambers accommodating the
cassette and the other of the chambers accommodating the tilting
movement of said reel retention members as the
transport slider moves in the housing. 3. A holder according to
claim 2, in which the transport slider has aligned pin extensions
adjacent opposite ends of said rear wall, said pin extensions
having associated with them slots in the adjacent side walls of the
housing and running in the direction of movement of the slider and
cassette to limit the ejection movement of the transport slider,
and said pin extensions pivotally mounting the transport slider to
permit tilting of the retention members
into and out of the cassette reel apertures. 4. A holder according
to claim 3, in which the pin extensions and slots are disposed
adjacent both chambers and adjacent the ribs therebetween, and said
resilient means bearing against the rear wall of the transport
slider in said first chamber and in off-centre relation to the
pivot axis extending through said pin extensions whereby to tilt
the slider under influence of the resilient means to withdraw the
retention members from the reel apertures, and means on the slider
and adjacent the retention members to limit
tilting of the slider in the housing. 5. A holder .[.according to
claim 1, in which.]. .Iadd.for tape cassettes and the like, the
holder comprising a housing having at least one compartment with an
open front side to slidably receive a slider in the compartment, a
slider in the housing and adapted to linearly transport a cassette
into and out of the compartment, the slider having a
cassette-engaging rear wall spaced inwardly from said open front
side of the housing and the slider having an open and unobstructed
front side permitting removal of the cassette from the slider by
sliding movement and without tilting, stop means to limit the
length of sliding movement of said slider, locking means being
provided to hold the slider in its compartment against the force
exerted by a spring in the housing and urging the slider into open
position, and cassette reel retention members brakingly engaging
into the cassette reel apertures when said slider is locked, said
retention members being pivotable in a plane perpendicular to the
direction of sliding in response to and upon movement of the slider
into its open position thereby disengaging from said reel
apertures, .Iaddend.the transport slider is L-shaped, with lateral
guide walls, forms a drawer which has in its base a pair of
counterslots in which retaining levers are pivotably supported as
locking members in
alignment with slots in the opposite wall of the housing. 6. A
holder according to claim 5, in which stops are moulded on the base
to limit the ejection movement of the slider in co-operation with
aligned guide slots
in the adjacent covering wall. 7. A holder .[.according to claim 1,
in which.]. .Iadd.for tape cassettes and the like, the holder
comprising a housing having at least one compartment with an open
front side to slidably receive a slider in the compartment, a
slider in the housing and adapted to linearly transport a cassette
into and out of the compartment, the slider having a
cassette-engaging rear wall spaced inwardly from said open front
side of the housing and the slider having an open and unobstructed
front side permitting removal of the cassette from the slider by
sliding movement and without tilting, stop means to limit the
length of sliding movement of said slider, locking means being
provided to hold the slider in its compartment against the force
exerted by a spring in the housing and urging the slider into open
position, and cassette reel retention members brakingly engaging
into the cassette reel apertures when said slider is locked, said
retention members being pivotable in a plane perpendicular to the
direction of sliding in response to and upon movement of the slider
into its open position thereby disengaging from said reel
apertures, .Iaddend.the transport slider is T-shaped and has
moulded on the back of its longitudinal shank stop teeth which have
guide slots in the side wall of the housing associated with them,
and in which tongues are cut out of the covering wall and angled
towards the inside of the housing, and have associated with them
oblique control surfaces on the
transverse shanks of the transport slider. 8. A holder .[.according
to claim 1, in which.]. .Iadd.for tape cassettes and the like, the
holder comprising a housing having at least one compartment with an
open front side to slidably receive a slider in the compartment, a
slider in the housing and adapted to linearly transport a cassette
into and out of the compartment, the slider having a
cassette-engaging rear wall spaced inwardly from said open front
side of the housing and the slider having an open and unobstructed
front side permitting removal of the cassette from the slider by
sliding movement and without tilting, stop means to limit the
length of sliding movement of said slider, locking means being
provided to hold the slider in its compartment against the force
exerted by a spring in the housing and urging the slider into open
position, and cassette reel retention members brakingly engaging
into the cassette reel apertures when said slider is locked, said
retention members being pivotable in a plane perpendicular to the
direction of sliding in response to and upon movement of the slider
into its open position thereby disengaging from said reel
apertures, .Iaddend.the transport slider is T-shaped and has
moulded on the back of its longitudinal shank stop teeth which have
guide slots in the covering wall associated with them, and in which
tongues are cut out of the transverse shanks of the transport
slider and angled towards the inside of the housing, and have
associated with
them control surfaces on the covering wall. 9. A holder
.[.according to claim 1, in which.]. .Iadd.for tape cassettes and
the like, the holder comprising a housing having at least one
compartment with an open front side to slidably receive a slider in
the compartment, a slider in the housing and adapted to linearly
transport a cassette into and out of the compartment, the slider
having a cassette-engaging rear wall spaced inwardly from said open
front side of the housing and the slider having an open and
unobstructed front side permitting removal of the cassette from the
slider by sliding movement and without tilting, stop means to limit
the length of sliding movement of said slider, locking means being
provided to hold the slider in its compartment against the force
exerted by a spring in the housing and urging the slider into open
position, and cassette reel retention members brakingly engaging
into the cassette reel apertures when said slider is locked, said
retention members being pivotable in a plane perpendicular to the
direction of sliding in response to and upon movement of the slider
into its open position thereby disengaging from said reel
apertures, .Iaddend.the transport slider has on the back of its
longitudinal shank stop teeth which have guide slots in the
covering wall associated with them, and in which levers aligned
with the core apertures of the cassette are cut out of the
longitudinal shank, which are bent out of the plane of the
longitudinal shank and when the cassette is pushed in are pivoted
with their free ends into the core
apertures to lock the tape spools. 10. A holder .[.according to
claim 1, in which.]. .Iadd.for tape cassettes and the like, the
holder comprising a housing having at least one compartment with an
open front side to slidably receive a slider in the compartment, a
slider in the housing and adapted to linearly transport a cassette
into and out of the compartment, the slider having a
cassette-engaging rear wall spaced inwardly from said open front
side of the housing and the slider having an open and unobstructed
front side permitting removal of the cassette from the slider by
sliding movement and without tilting, stop means to limit the
length of sliding movement of said slider, locking means being
provided to hold the slider in its compartment against the force
exerted by a spring in the housing and urging the slider into open
position, and cassette reel retention members brakingly engaging
into the cassette reel apertures when said slider is locked, said
retention members being pivotable in a plane perpendicular to the
direction of sliding in response to and upon movement of the slider
into its open position thereby disengaging from said reel
apertures, .Iaddend.on the open side of the housing accommodating
the cassette, the locking means engages over the inserted cassette
and is arranged on one end wall of the housing. .Iadd. 11. A holder
for tape cassettes and the like, the holder comprising a housing
having at least one compartment with an open front side to slidably
receive a slider in the compartment, a slider in the housing and
adapted to transport a cassette into and out of said compartment,
the slider having a cassette-engaging rear wall spaced inwardly
from said open front side of the housing, stop means to limit the
length of sliding movement of the slider, locking means being
provided to hold the slider with a cassette in its compartment
against the force exerted by a spring in the housing and urging the
slider into its open position, at least one cassette reel retention
member brakingly engaging into a cassette reel aperture when said
slider is locked, said one retention member being mounted at said
slider rear wall and being pivotable, together with said rear wall
in a plane perpendicular to the direction of sliding in response to
and upon movement of the slider into its open position and thereby
disengaging from said reel apertures. .Iaddend..Iadd. 12. A holder
according to claim 11 and including a pair of juxtaposed ribs
spaced from each other in the compartment and extending
substantially parallel to the direction of sliding movement of the
slider and cassette, the ribs dividing the compartment into
adjoining first and second chambers, the first of said chambers
receiving the cassette and slider to accommodate the sliding
movement thereof, and the second of the chambers accommodating the
tilting movement of the reel retention member when pivoted out of
the reel aperture of the cassette. .Iaddend. .Iadd. 13. The holder
according to claim 12 wherein the rear wall of the slider has a
side edge confronting and moving along the ribs in the compartment,
the slider being pivotable about an axis extending along said
elongated side edge of the rear wall, the spring exerting a tilting
torque upon said rear wall to tilt the slider and withdraw the
retention member from the reel aperture when the slider and
cassette move toward the open front side of the housing.
.Iaddend..Iadd. 14. A holder for tape cassettes and the like, the
holder comprising a housing having at least one compartment with an
open front side to slidably receive a slider in the compartment, a
slider in the housing and adapted to transport a cassette into and
out of said compartment, the slider having a cassette-engaging rear
wall spaced inwardly from said open front side of the housing, stop
means to limit the length of sliding movement of the slider,
locking means being provided to hold the slider with a cassette in
its compartment against the force exerted by a spring in the
housing and urging the slider into its open position, at least one
cassette reel retention member brakingly engaging into a cassette
reel aperture when said slider is locked, said slider extending
substantially to said open housing front side, at least one
cassette reel retention member extending from a slider portion
adjacent said open housing front side into a cassette reel aperture
in braking engagement therewith when the slider is in its inner
position, said reel retention member disengaging from said aperture
by tilting in a plane perpendicular to the direction of sliding
once the slider has moved along a predetermined path of the
housing. .Iaddend.
Description
The present invention relates to holders for tape cassettes, for
example magnetic tape cassettes, and the like and is in the form of
a rectangular housing open on one long narrow side, with locking
members for the tape spools of the cassette which are pivoted into
the spool apertures of the cassette when the latter is pushed in,
and are pivoted out of the spool apertures when the cassette is
pushed out. The pivoting movements of the locking members are
controlled by means of an L-shaped slider which is supported so
that it is movable in the direction of the movement of the
cassette, and has a pressure spring acting on it.
A tape cassette has been proposed which has a series of adjacent
chambers, formed by means of drawn-in partitions, each of which
accommodates one cassette and into which the cassettes that are to
be stored are pushed from the front. In order that the cassettes
should be held firmly in the chambers and the unwinding and take-up
spools for the tape should be locked, on a side wall of each
chamber an L-shaped slider is supported so that it is
longitudinally movable, and the slider has two apertures arranged
one behind the other in the direction of movement of the slider.
The apertures have associated with the corresponding apertures in
the adjacent side wall to allow room for the movement of two blades
attached to the slider which have locking cams for the cassette
spools.
A leaf spring which is led through an aperture in the base and is
attached to the base acts on the angled transverse shank of the
slider. The stored cassettes project forwards out of the magazine
so that they can be grasped laterally with the fingers and pulled
out.
When the cassette is pulled out, the slider is also pulled with it
for a short distance, and then, assisted by the spring, reaches a
position in which the cams pivot out of their locking position,
whereupon the cassette can be pulled out without hindrance.
The object of the present invention is to create a cassette holder
out of which the cassettes no longer partly project in the inserted
state and are exposed to the risk of dirt and other damage, and
which in addition will offer the advantage that the cassette is
particularly easy to remove.
According to the invention the dimensions of the housing are such
that it takes in the cassette completely, and the slider is
constructed as a transport slider so that when the blocking means
holding the cassette in its inserted position is released the
slider automatically conveys the cassette in advance into a
position in which it is easy to grasp.
By way of example only embodiments of the invention will now be
described in more detail with reference to the accompanying
drawings of which:
FIGS. 1 and 2 show respectively a first embodiment of the invention
in longitudinal section and cross-section along the line II--II in
FIG. 1,
FIGS. 3 and 4 show respectively a second embodiment of the
invention in longitudinal section and in cross-section along the
line III--III in FIG. 3,
FIGS. 5 and 6 show respectively a third embodiment of the invention
in longitudinal section and in cross-section along the line IV--IV
in FIG. 5,
FIG. 7 shows a fourth embodiment of the invention in a diagrammatic
cut-off cross-section,
FIGS. 8 and 9 show respectively a fifth embodiment of the invention
in longitudinal section and in cross-section along the line V--V in
FIG. 8.
The holder consists of three parts, i.e., a one-piece housing 1, a
transport slider 2, and a pressure spring 3. The housing 1 has a
base 4, opposite which the housing 1 is substantially open to form
an entrance or open front side for the insertion and removal of a
cassette 5, narrow end walls 6 and 7, and side walls 8 and 9. On
the outside of the wall 9 strips 10 are arranged which preferably
have a dovetail-shaped cross-section, whilst on the outside of the
wall 8 there are grooves 11 which match the strips 10. Several
similar holders may be stacked and combined to form a unit by
pushing together the inerlocking elements 10, 11.
The end wall 6 is provided along a length 12 from the housing
entrance and parallel to the walls 8, 9 with two parallel slots 6.1
defining a flexible spring tongue 13 therebetween. Such slots are
located in the area between an adjoining rib 19 and the side wall
9. Part of the end wall 6 can therefore be flexibly deflected with
respect to the remainder of the end wall so that a spring tongue 13
is produced. The spring tongue 13 has a lug 14 to keep the cassette
5 locked into the inserted position, whilst the key 15 facilitates
deflection of the tongue.
In the embodiment shown in FIGS. 1 and 2, the thickness of the
inside of the housing between the two walls 8 and 9 is greater than
the width of the cassette 5 at its widest point. Space is then
provided for ribs 19 (which project inwards from the inside of each
end wall 6 and 7, so that when being inserted and removed the
cassette 5 is guided between the ribs 19 and the wall 9
substantially parallel to the side walls.
The end walls 6 and 7 have slots 16 which are aligned with one
another and run parallel to the walls 8, 9, and the length of which
limits the ejection movement of the transport slider 2 which is
restrained by pin like extensions 17 of the transport slider 2 are
guided in the slots 16.
The transport slider 2 has an approximately L-shaped cross-section
with triangular reinforcing lugs 18. Between its transverse shank
20 and the base 4 of the housing the pressure spring 3 is stressed
and is positioned so that it is off-set towards the wall 9. The
transverse shank or rear wall 20 on which the pressure spring 3
acts operates as a lever arm which is pivotable about the axis of
the pin extensions 17. The other shank 21 of the transport slider
has two projections 22, each of which carries an inwardly-pointing
retainer cam 23. When the cassette is pushed in, these cams engage
in the core apertures of the cassette 5 and lock them. Between the
projections 22 there is a tongue 24 which-- as is apparent from
FIG. 2--is inclined outwardly from the plane of the shank 21. The
shank 21 as a whole rests on the side of the ribs 19 furthest from
the cassette 5 so that it can execute the tilting movement
mentioned previously. The front side of the slider 2, opposite the
rear wall 20, is open and unobstructed to permit the cassette 5 to
slide off the slider 2 when the retainer cams 23 are tilted or
swung out of the core apertures.
In order to store the cassette, after displacing the spring tongue
13 laterally from the long edge of the cassette where the tape is
exposed and must be protected, the cassette is pushed into the
space between the wall 9 and the ribs 19. When the cassette meets
the transverse shank 20 of the transport slider 2, the spring 3 is
compressed and the transport slider is tilted into the position
shown by solid lines in FIG. 2; the cams 23 are thereby pivoted
into the core apertures. As soon as the cassette has been pushed
into the position shown by solid lines in FIG. 1, the spring tongue
13 springs back and holds the cassette firmly with its lug 14. The
spring 3 remains compressed.
If the spring tongue 13 is deflected laterally, perhaps with the
finger, the spring 3 pushes the transport slider outwards, and with
it the cassette 5. As soon as the pin extensions 17 reach the end
of the slots 16, the transport slider cannot be pushed any further,
and tilts about the axis of the pin extensions, so that the cams 23
emerge from the core apertures of the cassette. The tilting
movement is limited by the tongue 24 meeting the inside of the
covering wall 8. The tongue 24 is displaced just so far out of the
plane of the shank 21 that when the tongue rests against the
covering wall 8 the cams 23 do in fact free the cassette 5 but
still rest against it with some friction. This prevents the
cassette from being hurled out; due to this frictional retardation
it is instead lightly clamped in a convenient position to be
grasped. Removal causes no difficulty, since the tongue 24 can
yield resiliently when the thickened part of the cassette is pulled
over the cams 23.
Both the housing 1 and the transport slider 2 consist of a
thermoplastic plastics material. It is understood that both
elements can be produced by means of injection moulds which have
relatively few cut-backs so that the tools can be correspondingly
low-cost.
In the embodiment shown in FIGS. 3 and 4, the wall 8 has two groups
of two slots each, parallel to the direction of movement of the
cassette 5. The first group comprises the guide slots 26, which are
intended to limit the travel of the transport slider 2, whilst the
second group comprises the control slots 27. In the embodiment, a
slot 26 is provided in line with each slot 27, but this is not
essential. More than two slots 26 may also be provided.
The transport slider 2 is in the shape of a drawer with a base 28,
impact wall 29 and lateral guide walls 30. In order to save
material, the base 28 is provided with a cut-out 31. Counter-slots
32 are formed in the base 28 of the transport slider, parallel to
the control slots 27. Parallel to the counter-slots 32, near the
end nearest the impact wall 29, a thin spindle 33 on which are
pivoted retaining levers 34 which are pivotable through 90.degree.
and are aligned with the control and counter-slots 27 and 32.
The longer lever arms of the retaining levers 34 engage in the core
apertures of the tape coil spools of the cassette 5 when the latter
is pushed in, as indicated by solid lines in FIG. 4. The shorter
lever arms project into the control slots 27 associated with them
and are slightly angled. Finally, stops 35 are moulded on the base
28 of the transport slider which are aligned with the guide slots
26 of the wall 8 of the housing.
To assemble the holder, first the spring 3 is inserted into the
housing 1; guides (not shown) may be provided for the spring to
prevent it from kinking. The levers 34 are then moved over with
their long lever arm counter to the insertion direction, so that
they substantially disappear in the counter-slots 32 of the
transport slider. The position of the spindle 33 and the length of
the levers and of the slots are calculated to correspond. The
transport slider 2 can now be introduced into the housing with
slight pressure, with the wall 8 of the housing being flexibly
deformed towards the outside and the base 28 of the transport
slider 2 towards the inside to a certain extent. This is possible
since both parts are made of a suitable thermoplastic plastic
material--preferably polystyrene. This deformation is caused by the
stops 35, the oblique surfaces of which facilitate the insertion of
the transport slider.
When the transport slider is pushed in far enough, the stops 35
drop into the guide slots 26. The stop surfaces 36 of the stops 35
running normal to the plane of the base 28 prevent the transport
slider from being pulled out again without the above mentioned
flexible deformation being produced by hand. Since the short lever
arm of the retaining levers 34 is slightly angled, they also
project somewhat out of the counter-slots during assembly and then
drop into the associated control slots 27. The levers cannot yet
right themselves, since the spindles 33 are still in front of the
control slots 27. This position of the slider 2 is indicated by
dash-dotted lines in FIG. 4.
A cassette 5 can now be pushed in, laterally deflecting the spring
tongue 13. The cassette first meets the inside of the impact wall
29 of the transport slider. When a slight pressure is exerted
inwards on the cassette the transport slider is now pushed in
further, counter to the spring 3, until the short lever arms of the
retaining levers 34 run onto the end edge of the control slots 27.
The retaining levers are thereby pivoted out of the upright
position out of the base 28 so that the long lever arms engage in
the core apertures and secure the tape spools. In this position of
the transport slider 2 with the cassette 5, the spring 3 is almost
fully compressed, and the cassette has reached a position in which
the lug 14 can spring back and over the outer edge of the cassette.
The cassette is thus held and the spring 3 remains compressed for
the ejection operation.
In order to initiate the latter, the key 15 is pressed outwards a
little by hand. The spring 3 can then push the transport slider 2
outwards, with the cassette 5, whereupon the short lever arms of
the retaining levers 34 meet the other end edge of the control
slots 27 and thereby pivot the levers back into a position which is
approximately parallel to the direction of movement and recessed
into the base 28. The cassette is not catapulted out, since its
movement is retarded by lateral strips 37; it can however be
completely pulled out. The strips are moulded on the inside of the
guide walls 30 of the transport slider.
In the embodiment shown in FIGS. 5 and 6, two slots 46 with an
approximately U-shaped are formed in the covering wall 8. The two
tongues 47 acting like leaf springs which are thus formed are
obliquely angled in the direction of the inside of the housing, and
assume the rest position shown by dash-dotted lines in FIG. 6.
In addition, the wall 8 has two guide slots 48 parallel to the
insertion direction of the cassette 5 and a stop tooth 49 of the
transport slider 2 is guided in each slot.
The transport slider 2 has a base 50 which is approximately
T-shaped, and at each end of a shank an angled support section 51,
53 is provided.
The stop teeth 49 are moulded on the longitudinal shank 52, and the
helical spring 3 presses on the support section 53 of this shank.
The transverse shanks 54, 55 effect the lateral guiding of the
transport slider and the retention of the cassette 5. In addition,
they each have, near the central longitudinal shank 52, an oblique
control surface 56, the cutting edge 57 of which faces towards the
covering wall 8 of the housing 1.
Assembly is carried out by first inserting the spring 3 into the
housing 1. The transport slider is then pushed into the housing 1,
with the base 50 being deformed slightly inwards and the wall 8
deformed slightly outwards. This flexible deformation is ensured by
the choice of a suitable plastics material for both parts. As soon
as the stop teeth 49 reach the guide slots 48 they drop into the
latter and the flexible deformation disappears. The transport
slider is then in the position indicated by dash-dotted lines in
FIG. 6.
The holder is now ready to receive a cassette; the transport slider
cannot be pushed out by the spring 3 since the stop surfaces 58 of
the stop teeth 49 rest against the end edge of the guide slots 48.
If a cassette 5 is now pushed in whilst gently pushing the spring
tongue 47 away sideways, the cassette first meets the inside
surface of the support section 53 facing the cassette. When it is
pushed in further, the transport slider is pushed further into the
housing 1, compressing the spring 3. The oblique control surfaces
56 thereby engage behind the tongues 47, lift the latter inwards
out of the base 8, and push them into the core apertures of the
cassette, with which the tongues 47 are aligned. The tape spools
are thus locked. The tongues are thereby flexibly deformed and
return to their rest position when the cassette is removed. For
this purpose it is sufficient if the lug 14 of the tongue 13, which
has hitherto held the cassette in the inserted position and the
spring 3 tensioned, is lifted away from the cassette 5 by exerting
slight lateral pressure on the key 15, so that the spring 3 can
expand, whereupon the transport slider 2 returns to the position
indicated by dash-dotted lines. In order that the cassette should
not be catapulted out, braking springs (not shown) can be
provided.
FIG. 7 shows how the reverse arrangement of the tongues 47' can be
provided on the transport slider and the control surfaces 56' on
the base 8' of the housing. In this case it is necessary, as is
easily apparent, to reverse the direction in which the tongues
extend, and thus they here point away from the insertion aperture
of the holder.
In the embodiment shown in FIGS. 8 and 9 the spring 3 rests on the
one hand against the inside of the base 4, and on the other hand on
the transverse shank 67 of the transport slider 2 nearest the base
4, and is compressed in the storage position shown. The transport
slider 2 is substantially L-shaped in cross-section, with a
longitudinal shank 66, the transverse shank 67 and lateral guide
surfaces 68. From the surface of the longitudinal shank 66 two stop
teeth 69 extend in the direction of the wall 8 of the housing 1
into guide slots 70 which are formed in the wall 8. The end edges
71 of the slots 70, facing the holder aperture, serve as stops for
the ejection movement of the transport slider. In addition, in the
surface of the longitudinal shank 66 of the transport slider 2 two
apertures 72 extending lengthwise in the ejection direction are
provided, and from the end of these near the holder aperture two
retaining levers 73 extend. These retaining levers are bent out of
the plane of the shank 66 and assume the rest position indicated by
dash-dotted lines in FIG. 9, out of which they can be flexibly bent
into the position shown by solid lines.
In order to assemble the holder explained this far, first the
spring 3 is inserted into the housing 1; in order that the spring
should not kink, guides (not shown) are preferably provided. The
transverse slider is then pushed in, for which purpose the lug 14
is bent aside, until the stop teeth 69 meet the front edge of the
wall 8. Since the teeth 69 have an oblique surface, the transport
slider can be pushed in further with increased pressure. As soon as
the teeth 69 reach the guide slots 70 they fall into the
latter.
The holder is now ready to receive a cassette 5. The cassette is
placed on the transport slider and pushed into the housing with
slight pressure. The retaining levers thereby meet an oblique
surface 64 on the free edge of the wall and are pushed inside the
housing, whereupon they engage in the core apertures of the
cassette and lock the tape spools. When the cassette 5 is pushed in
far enough (FIG. 8) the lug 14 snaps over the edge of the cassette
and holds the cassette firmly. To remove the cassette, the lug is
pushed outward with the key 15 so that the spring 3 ejects the
transport slider with the cassette; the retaining levers 73 thereby
return to their rest position and free the cassette 5. The ejection
movement of the cassette 5 can be retarded by means which are not
shown. The transport slider is pushed out until the stop teeth 69
engage with the end edges 71.
It should be emphasized that with this embodiment no additional
space is required in the housing for the pivoting out of the
retaining lever.
* * * * *