U.S. patent application number 11/125368 was filed with the patent office on 2005-09-29 for holder for securing objects.
Invention is credited to Mekyska, Erich.
Application Number | 20050210634 11/125368 |
Document ID | / |
Family ID | 34923304 |
Filed Date | 2005-09-29 |
United States Patent
Application |
20050210634 |
Kind Code |
A1 |
Mekyska, Erich |
September 29, 2005 |
Holder for securing objects
Abstract
A holding device for spherical and flat objects includes a
carrier body, a clamping device held to the carrier body, a cover
plate held to the carrier body, a plurality of holding elements,
and an axle accommodated by the holding elements. The clamping
device includes first and second clamping elements for
accommodating round or angular objects. The cover plate and carrier
body are partially spaced-apart to provide a guide slot, and at
least one of the carrier body or the cover plate includes retention
elements including formed lips extending from a basic body, each
lip including an uninterrupted front edge. The cover plate is
pivoted in a tiltable manner around the axle to connect the cover
plate with the carrier body and is held under tension of a torsion
spring against the carrier body. The cover plate is also formed so
as to allow a tilt motion against the force of the spring to open
the guide slot.
Inventors: |
Mekyska, Erich; (Pforzheim,
DE) |
Correspondence
Address: |
WILLIAM COLLARD
COLLARD & ROE, P.C.
1077 NORTHERN BOULEVARD
ROSLYN
NY
11576
US
|
Family ID: |
34923304 |
Appl. No.: |
11/125368 |
Filed: |
May 9, 2005 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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11125368 |
May 9, 2005 |
|
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10361546 |
Feb 10, 2003 |
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60425505 |
Nov 12, 2002 |
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Current U.S.
Class: |
24/67R ;
24/67.11 |
Current CPC
Class: |
Y10T 24/20 20150115;
Y10T 24/206 20150115; B42F 1/00 20130101; A44B 1/04 20130101 |
Class at
Publication: |
024/067.00R ;
024/067.11 |
International
Class: |
A44B 001/04 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 8, 2002 |
EP |
02024853.0 |
Nov 8, 2001 |
DE |
201 18 073.1 |
Claims
What is claimed is:
1. A holding device for spherical and flat objects comprising: (a)
a carrier body; (b) a clamping device held to the carrier body, the
clamping device including first and second clamping elements for
accommodating round or angular objects; (c) a cover plate held to
the carrier body, the cover plate and carrier body being partly
spaced-apart to provide a guide slot; (d) a plurality of holding
elements; and (e) an axle accommodated by said holding elements;
wherein: at least one of the carrier body or the cover plate
comprises retention elements including a plurality of formed lips
extending from a basic body, each lip including an uninterrupted
front edge; the cover plate is pivoted in a tiltable manner around
said axle to connect the cover plate with the carrier body; the
cover plate is held under a tension force of a torsion spring
against the carrier body; and the cover plate is formed so as to
allow a tilt motion against the force of the spring to open the
guide slot;
2. The holding device according to claim 1, wherein each of said
first and second clamping elements have a shape of a half dome,
each halfdome being truncated at a respective top of said halfdome
to provide the guide slot and a horizontal and half-cylindrical
recess in a surface touching an opposing clamping element.
3. The holding device according to claim 1, wherein the cover plate
is rocker-shaped and is bound to the carrier body by means of two
projections on the carrier body, each of said projections
comprising a bore accommodating a respective cover plate axle
around which a respective torsion spring is wound and a horizontal
and inbound projection of the cover plate, the torsion spring
exerting torque onto the carrier body and the cover plate which
compresses the cover plate.
4. The holding device according to claim 1, wherein the lips are
formed parallel to and spaced-apart from each other.
5. The holding device according to claim 1, wherein each lip
extends at an angle of about degrees to about 50 degrees relative
to the basic body.
6. The holding device according to claim 1, wherein the front edges
are formed in a zigzagging or undulating manner.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation-in-part of U.S. patent
application Ser. No. 10/361,546 filed Feb. 10, 2003 which claims
the benefit under 35 U.S.C. .sctn.119(e) of U.S. provisional patent
application Ser. No. 60/425,505 filed Nov. 12, 2002 and also claims
priority under 35 U.S.C. .sctn.119 of European Application No.
02024853.0 filed Nov. 8, 2002, which claimed priority of German
Patent Application No. 201 18 073.1 filed Nov. 8, 2001.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a holding device for
spherical and flat objects. The device includes a carrier body and
a clamping device which is held to the carrier body and in which
the clamping device includes first and second clamping elements for
accommodating round or angular objects. The holding device further
includes a cover plate which is held to the carrier body and in
which the cover plate and the carrier body are spaced-apart to
provide a guide slot. At least one of the carrier body and/or the
cover plate includes retention elements including a plurality of
formed lips extending from a basic body, each lip including an
uninterrupted front edge. The cover plate is pivoted in a tiltable
manner around an axle located at holding elements to connect the
cover plate with the carrier body. The cover plate is held under
tension of a torsion spring against the carrier body. The cover
plate is also formed so as to allow a tilt motion against the force
of the spring to open the guide slot.
[0004] 2. The Prior Art
[0005] Many holding devices for spherical or flat objects are
known, but as a general rule these devices are heavy and cumbersome
and require a large amount of space or can accommodate objects only
loosely. However, it may be necessary to hold objects in an
unfavorable position, for example in a vertical one, in which the
objects need to be accommodated safely and tight to prevent the
objects from falling out of the holding device. For such
applications, the holding device should as far as possible be
universally useable and for example be suitable for accepting small
items, tubes, toothbrushes, writing implements, sheets of paper and
the like. In most cases there is a lack of suitable space or a
suitable storage place for providing adequate quantities of the
necessary utensils or objects so that they are accessible to
everyone easily.
[0006] Even in the age of electronic desktop publishing technology,
for example, a paper holding device and if needed a writing
implement holding device are indispensable. In particular, in
locations where short notes are required, a holding device can
prove very useful. For example, a holding device is useful in
domestic situations or office premises near a telephone, a fax
machine or the like. Holding devices for various objects are, for
example, known which include loops or holes in a carrier body, for
example, holding devices for holding writing devices. However,
these holding devices are associated with a basic disadvantage in
that mostly they are designed for only a particular size or a
particular diameter of the object. If objects of a different size
are used, these holding devices no longer fit, i.e. the object
simply lies in the holding device without being held properly. The
situation is similar in the case of writing paper required, which
in most cases is not readily available; consequently, notes are
written into the margin of a newspaper or the like.
[0007] To the extent that paper holders are known, they are limited
to surrounding a block, to adhesive notepaper or memo-pad boxes;
however, all of these paper holders have to rest on a horizontal
surface. When an almost vertical type of attachment is chosen, for
example by the use of magnetic clamps on a vertical metal wall,
these holding devices are suitable for only relatively light-weight
objects, such as for example an individual sheet of paper.
SUMMARY OF THE INVENTION
[0008] It is an object of the present invention to provide a
holding device for round and flat or angular objects which objects
can easily be inserted and held by jamming or pressing action, and
can subsequently be removed just as easily.
[0009] According to the invention, this object is met through the
holding device as disclosed herein.
[0010] The holding device according to the invention includes a
carrier body. The carrier body includes a clamping device with two
opposing clamping elements for accommodating round or angular
objects. The holding device further includes a cover plate which is
held to the carrier body and which is spaced-apart to provide a
guide slot. At least one of the guide slot and/or the cover plate
includes retention elements. The retention elements include a
plurality of formed lips extending from a basic body, each lip
including an uninterrupted front edge. The cover plate is pivoted
in a tiltable manner around an axis located at holding elements to
connect the cover plate with the carrier body. The cover plate is
further held under tension of a torsion spring against the carrier
body, and the cover plate is formed so as to allow a tilt motion
against the force of the torsion spring to open the guide slot.
[0011] In an advantageous embodiment, the elements forming the
guide slot are arranged so as to be spaced-apart by a larger
distance. In this embodiment, the length of the lips are such that
the clearance between the clamping surfaces of the carrier body and
the cover plate is almost completely covered by the lips. As a
result, extremely flat objects such as for example an individual
sheet of paper or a larger stack of paper or a single check
identification card and significantly thicker objects can be
accommodated in one and the same holding device. In this design,
the formed lips bridge the clearance between the two elements
forming the guide slot, namely the cover plate and the carrier
body, and enable the lips to rest directly against the object to be
accommodated, thus providing safe holding.
[0012] In this arrangement, the object can be attached either in a
horizontal or a vertical position or in a position inclined to
vertical. The holding device is thus eminently suitable for
accommodating maps or drawings as well as tubes, check
identification cards, calling cards or other flat objects which if
needed can also be arranged in a stack.
[0013] Advantageously, the lips are connected in a single piece
with the basic body which accommodates them, so that when an
elastic material is used there is sufficient inherent elasticity in
order to be able to accept the respective objects. The lips which
have been formed on the basic body in one piece can be arranged so
as to be parallel, undulating or zigzagging, with the spacing
between adjacent lips remaining constant.
[0014] According to an embodiment of the invention, the lips are
arranged perpendicular or at an angle of 20 to 50 degrees relative
to the basic body, with the lips including uninterrupted or
interrupted front edges. Thus, the elastic retention means includes
a flat body with several lips formed in one piece and extending
parallel to each other. The lips are arranged at a particular angle
and thus facilitate the insertion of objects. The lips also provide
adequate resistance so that the objects are prevented from falling
out. The outer edges of the lips come to rest against the objects
so that they are held by a jamming or quasi-wedging action.
[0015] The holding device provides a particular advantage if a
stack of several sheets of paper is inserted between the clamping
surfaces. Due to multiple contact established by the lips or front
edges which are aligned parallel in relation to each other, a
single sheet can be removed from the existing stack of loosely
stacked paper, without the complete stack or further papers being
pulled out of the holding device.
[0016] The lips can be arranged so as to be inclined or preferably
so as to extend across the direction of insertion, with the angle
of inclination of the lips at the opposing retention means
supplementing itself to the extent that the ends of the lips either
touch each other or protrude into the respective opposing clearance
space. This arrangement ensures that the lips come to rest fully
against the object to be accommodated, for example a stack of paper
or a newspaper or a map. Because the objects inserted are
relatively light in weight, the contact force of the elastic lips
provides a safe hold with the above-mentioned advantages. Several
flat objects arranged in a stack can be accommodated and
subsequently removed individually, either in downward direction or
to the side at an angle, without the remaining objects being
removed as well at the same time, because they are kept reliably
and safely in place by the jamming action of the lips. This effect
results because when a single object, for example a sheet of paper,
is withdrawn, always a considerable number of lips act upon the
remaining stack of paper. As a result, the contact force prevents
any object from slipping out. The front edge of the lips can be
uninterrupted or interrupted if required, so that the inherent
elasticity is further improved. To the extent that there are gaps,
these gaps can be arranged so as to be offset from lip to lip.
[0017] A further embodiment of the invention provides for the
retention means with the lips to be attached to the elements
forming the guide slot, namely the carrier body and the cover
plate, either flush or in an indentation, for example to be glued
on. As a result of this measure, almost the entire clearance
between the elements forming the guide slot is available for
accommodating objects.
[0018] A further specific embodiment of the invention provides for
the carrier body to be provided on the one hand for accommodating
the retention means and on the other hand for accommodating a
clamping device for accommodating and holding round or angular
objects. In this embodiment, a holding device for flat objects is
combined with a clamping device for accommodating round or angular
objects. In this way, an advantageous combination results which for
example can be used at the same time for accommodating a toothbrush
and a toothpaste tube, or in particular also for accommodating a
writing device and the paper required for it. The combination,
according to the invention, of a writing device holder and a paper
holder thus provides a constructional unit which can be attached in
a vertical or horizontal position, for example by using an adhesive
pad.
[0019] A further embodiment of the invention provides for the
carrier body to hold an upper cover plate, the carrier body and the
cover plate being held together by a pivoting means, around which a
torsion spring is wound and holds the pivoting cover plate under
mechanical tension as to press the cover plate against the carrier
body. Both the carrier body and the cover plate form a guide slot.
A stack of paper can thus be inserted into the guide slot where it
is held in any desired position by the retention means, while a
writing device is held by the further clamping device.
[0020] A further embodiment of the invention provides for the cover
plate and the carrier body to be held together by bearing support
projections or pins, arranged on the carrier body, which bearing
supports lock into place in corresponding counter elements on the
cover plate. The bearing supports include either bores which lock
into place with corresponding pins on the cover plate or horizontal
pins which lock into place with corresponding boxes in the cover
plate. Both combinations allow the cover plate to tilt.
[0021] In this arrangement, the cover plate of the holding device
and the carrier body which each form one part of the guide slot,
can be made either in a single part or if need be in two parts.
[0022] Either the cover plate or the carrier body may possibly
extend only partly over the corresponding counterpart. For example,
the cover plate can be attached to the bearing supports in a
rectangular aperture of the carrier body, or the carrier body can
be attached in a corresponding aperture of the cover plate.
Therefore, it is not absolutely necessary to use two components
which are of the same size and which are approximately
mirror-symmetrical. If the carrier body and the cover plate is a
two-part variant, accommodation of the cover plate in the carrier
body is for example within an opening, in that the cover plate can
be snapped into holding elements. In this way it is possible to
create an elegantly shaped variant, for example a holding device
for a writing device and for a paper pad, with the holding device
being extremely useful and being able to be attached in any
position, and furthermore making it possible to remove the writing
device with one hand and, if need be, to remove a single sheet from
the paper holder, either before or after this sheet is written
on.
[0023] In a further embodiment, the clamping device is designed for
accommodating and holding round or angular objects. For example,
the clamping device may hold writing devices, tools, toothbrushes,
wet shavers, nail files and the like. The clamping device includes
a carrier plate with two clamping elements, of which at least one
clamping element is held so as to be slidable and springloaded. The
carrier plate and the clamping element, of which there is at least
one, include corresponding guide means. Due to the clamping jaw, of
which there is at least one, being movably arranged on the carrier
body or on the carrier plate and being guided under spring tension,
they can be compressed and in a home position they can touch each
other, at least in the lower region, so that both clamping elements
come to rest in a defined position relative to each other.
[0024] In this arrangement, the area of the clamping jaws is
relatively large in relation to the carrier plate or the carrier
body. In this way, either a large full-surface support option or a
large concave-surface support option with a margin spaced at a
distance is achieved. This arrangement causes the clamping jaws to
slide properly on the carrier plate or on the carrier body. As an
alternative option, the two clamping elements or clamping jaws are
arranged so as to be slidable within a guide. As a result of the
slide guidance, the writing implements or similar utensils to be
accommodated can be accommodated by simply pressing them in, and
they can be removed just as easily.
[0025] Preferably, the writing-implement holder includes two
clamping jaws which are mutually opposed, and which in the home
position, at least in the lower region, can partly touch each other
so that the clamping jaws form a small gap in the upper region of
insertion so as to facilitate the insertion of the object. The
guide arrangement for the clamping jaws includes a base of the
guide and/or a raised guide surface, for example a bulge on the
carrier plate or if need be the carrier body. The base of the guide
engages at least one groove or one slot in the carrier plate. The
base of the guide includes at least two retention claws which are
aligned in opposite directions, with the retention claws gripping
the groove or the slot from behind.
[0026] As an alternative, the base of the guide can include a
sliding shoe, a triangular guide or a dovetail guide, with the
groove or the slot comprising a corresponding accommodation
surface. The above-mentioned measures prevent the base of the guide
of the clamping jaws from being able to slide out of the carrier
plate or the carrier body; in this case the connection would be
lost.
[0027] As an alternative, the guide arrangement of the clamping
jaws can additionally include at least one drill hole in the
transverse stay or in the base of the guide in order to accommodate
at least one pin held in the carrier plate, on which the clamping
jaw, of which there is at least one, slides to and fro. This
alternative embodiment supports the ease of operation of the
clamping jaws by a pin which is arranged at a certain distance from
the guide surface of the carrier plate or of the carrier body.
[0028] To facilitate insertion of writing devices and for improved
handling, the clamping jaws include two interior surfaces which are
opposite each other and which are designed to be
mirror-symmetrical. The interior surfaces are bevelled in the
direction of movement of the object, and in the middle region are
of round, angular or elliptic shape. In the transition area between
the bevelled surface and the shaped area there is a narrowing which
enables the writing device to be partially encompassed. As already
explained, the bevel provided on the clamping jaws facilitates
inserting and putting into place the objects, while the narrowing
requires that the clamping jaws are slightly pushed apart for
insertion, so that after the clamping jaws have closed up, the
round, triangular or elliptic region comes to rest against the
object, for example a writing device, thus preventing the object
from sliding out. In this arrangement the existing narrowing can be
spaced apart; alternatively it can cause the two opposing clamping
jaws to rest against the object.
[0029] In order to achieve even contact force onto the clamping
jaws and thus onto the writing devices, at least one spring is used
for spring tensioning, with the spring being arranged in a guide
between the brackets or the bases of the guides, and the supporting
bracket or the supporting rim of the carrier body.
[0030] In order to provide further improved retention, the inside
of the clamping jaws can include ribbing, roughening or a rubber
coating. In this arrangement, the carrier plate or the carrier body
can be round or if need be angular in shape. The carrier plate is
accommodated in a corresponding opening of the carrier body. Aside
from these considerations, the shape of the carrier body can be
designed to be independent and purposeful.
BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Other objects and features of the present invention will
become apparent from the following detailed description considered
in connection with the accompanying drawings. It should be
understood, however, that the drawings are designed for the purpose
of illustration only and not as a definition of the limits of the
invention.
[0032] In the drawings, wherein similar reference characters denote
similar elements throughout the several views:
[0033] FIG. 1 are three external views of the holding device
according to an embodiment of the invention;
[0034] FIG. 2 are partially broken views of the holding device
according to the embodiment of FIG. 1; and
[0035] FIG. 3 are three views of an embodiment of the carrier plate
used in the holding arrangement according to the invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0036] In FIG. 1, the holding device 1 according to an embodiment
of the invention is shown in three views. FIG. 1a shows a top view
of holding device 1. Holding device 1 is made up of a carrier body
2, on which a clamping device 3, made up of a first clamping
element 4 and a second clamping element 5 as well as a cover plate
6, is disposed.
[0037] FIG. 1b shows a rear view of holding device 1. FIG. 1b also
shows carrier body 2 with clamping device 3, but only one of the
clamping elements (second clamping element 5) can be seen in this
view. Cover plate 6, which is disposed behind clamping device 3 in
this partial view, partially surrounds clamping device 3. In FIG.
1c, the same holding device 1 as in FIGS. 1a and 1b is shown in a
side view. It is clearly evident from FIG. 1c how a carrier body 2
carries clamping device 3, which includes a first clamping element
4 and a second clamping element 5 as well as a cover plate 6. As
shown in FIG. 1c, carrier body 2 carries clamping device 3 so that
cover plate 6 can tilt approximately in the middle, about a holder.
In this way, a guide slot 7 opens in order to accommodate flat
objects, such as single sheets of paper, several sheets of paper,
check identification cards, or other flat objects in it.
[0038] In FIG. 2, holding device 1 as shown in FIG. 1 is shown in
several partial figures, in a partially broken view, in order to
show hidden details of holding device 1. In this connection, FIGS.
2a, 2b and 2c correspond to FIGS. 1a, 1b and 1c. In addition, FIGS.
2d and 2e show another detail of holding device 1 according to the
invention.
[0039] In FIG. 2a, which corresponds to the secondary figure from
FIG. 1, both clamping device 3 and cover plate 6 are disposed on a
carrier body 2. First clamping element 4 and second clamping
element 5 are shown partially transparent in FIG. 2. A slide 17 is
shown, in each instance, through first clamping element 4 and
second clamping element 5, which slide is affixed to these clamping
elements below first clamping element 4 and second clamping element
5. The two slides 17 surround an axle or a rail 18, which is
disposed within a carrier plate 19, which is connected with carrier
body 2. Two spiral springs 20, 21 are disposed on axle or rail 18,
which springs are tensed between slides 17 and carrier plate 19 in
compressive manner.
[0040] First clamping element 4 can be displaced to the left on the
carrier plate 19 in FIG. 2a, while second clamping element 5 can be
displaced to the right on carrier plate 19. By means of the
displacement of the individual clamping elements 4 and 5, spiral
springs 20, 21 disposed on axle or rail 18 are compressed, and
thereby press clamping elements 4 and 5 together, by way of slides
17. By means of force of the spiral springs 20 and 21, an object
that is held between first clamping element 4 and second clamping
element 5 is therefore securely attached. Carrier plate 19 can
optionally be part of carrier body 2. Carrier body 2 may also have
an indentation 25 into which carrier plate 19 fits precisely,
whereby carrier plate 19 accommodates axle or rail 18 for
accommodating the spiral springs 20 and 21. Aside from clamping
device 3, FIG. 2a also shows the partially transparent cover plate
6, through which holding elements 13 are visible, which accommodate
an axle 12, about which axle 12 a torsion spring 14 is wound.
Torsion spring 14 presses cover plate 6 against carrier body 2,
with loops at the end of its coils, in the vicinity of the two
holding elements 13. As a result, a guide slot 7 is closed on the
right in FIG. 2a, under the tension of torsion spring 14.
[0041] For attachment to carrier body 2, cover plate 6 engages into
a bore 16 of holding elements 13 with projections 22, not shown
here, and is mounted to pivot about holding elements 13 by means of
these projections 22, which engage into bores 16. In FIG. 2b,
carrier body 2 is shown, whereby cover plate 6 and the arrangement
that accommodates it, including carrier elements 13, axle 12, and
torsion spring 14, are shown as completely transparent. It is
evident from FIG. 2b how the torsion spring 14 is wound about axle
12 and how cover plate 6 is mounted to pivot about this axle 12, by
means of projections 22 that engage into a bore 16 of holding
elements 13. In FIG. 2c, holding device 1 according to the
invention is shown in a partially transparent view, whereby
clamping device 3 and cover plate 6 are shown. FIG. 2c clearly
shows how two slides 17 connected with first clamping element 4 and
second clamping element 5 engage about an axle 18. As shown in FIG.
2c, spiral springs 20 and 21 are tensed between slides 17 and
carrier plate 19, and clamping element 4 and clamping element 5
press against one another.
[0042] In the right part of FIG. 2c, cover plate 6 is shown,
whereby a holding element 13, which is connected with carrier body
2, can be seen in the partially transparent view of cover plate 6,
whereby holding element 13 has a bore 16 in which an axle 12 is
accommodated, on the one hand, and into which a projection 22 of
cover plate 6 engages. Shown for the first time in FIG. 2c is an
indentation 15, in which a retention element 8, shown in FIGS. 2d
and 2e, is accommodated. Retention element 8 is made up of a basic
body 10 and lips 9 molded onto it, whereby the molded lips 9 have
uninterrupted front edges 11 and either a zigzag progression or a
wavy progression. Molded lips 9 stand on the basic body 10 at an
angle between 20 and 50 degrees. Retention element 8 is shown in a
side view and a top view in FIGS. 2d and 2e. This retention element
8 preferably is made up of one element, and is made from an elastic
material, for example silicone or rubber. In this connection,
retention element 8 is accommodated in an indentation 15 of carrier
body 2, and glued onto it, for example. If pressure is placed on
the left part of cover plate 6 shown in FIG. 2c, with reference to
holding element 13, a guide slot 7 opens between cover plate 6 and
carrier body 2. Flat objects, for example, a sheet of paper or a
check identification card, can be inserted into guide slot 7. In
this connection, molded lips 9 assure a secure hold of the flat
object within guide slot 7, for a secure hold and clamping even if
guide slot 7 is opened further.
[0043] In FIG. 3, carrier body 2 is shown in three views. According
to an advantageous embodiment, carrier body 2 in FIG. 3a is made up
of a circular indentation 25 on the left side, to accommodate a
carrier plate 19, not shown here, for a clamping device 3, two
holding elements 13, each having a bore 16, and an approximately
rectangular indentation 15 to accommodate a retention element 8. In
FIG. 3b, in which carrier body 2 is shown in a first side view, one
can clearly see the two holding elements 13, which are shown as
semi-transparent, each having a bore 16 that serves to accommodate
an axle 12 and a cover plate 6 (shown in FIG. 2). In FIG. 3c,
carrier plate 2 is shown in another side view, whereby circular
indentation 25 can be seen through the semi-transparent
representation. Furthermore, a holding device 13 having bores 16 is
shown. Also shown is the approximately rectangular indentation 15
for accommodating a retention element 8, which is let in between
two holding devices 13.
[0044] Although only a few embodiments of the present invention
have been shown and described, it is to be understood that many
changes and modifications may be made thereunto without departing
from the spirit and scope of the invention as defined in the
appended claims.
* * * * *