U.S. patent number 3,559,813 [Application Number 04/749,883] was granted by the patent office on 1971-02-02 for module mounting system.
This patent grant is currently assigned to Thomas & Betts Corporation. Invention is credited to Charles William Sosinski.
United States Patent |
3,559,813 |
Sosinski |
February 2, 1971 |
MODULE MOUNTING SYSTEM
Abstract
A modular mounting system for mounting feed-through modules. A
feed-through module is one in which components, or conductors, may
be introduced to the module from both its front and back surfaces.
The module mounting system comprises first and second side rails
held together and supported by means of end blocks to which the
first and second side rails are assembled. Provision is made for
mounting holes in both the ends blocks and side rails to permit
fastening devices to be passed therethrough to mount the assembly
to a mounting surface. Placed within the side rails are flexure
means which engage in locking relationship steps on the module
walls thus retaining the module within the mounting system. The
flexure members side rails and end blocks may take on a number of
different configurations in accordance with the module
configuration, and the manner of mounting.
Inventors: |
Sosinski; Charles William
(Linden, NJ) |
Assignee: |
Thomas & Betts Corporation
(Elizabeth, NJ)
|
Family
ID: |
25015617 |
Appl.
No.: |
04/749,883 |
Filed: |
August 2, 1968 |
Current U.S.
Class: |
211/89.01;
211/26; 248/314; 248/507; 439/357; 439/716 |
Current CPC
Class: |
H05K
7/02 (20130101); H01R 13/518 (20130101) |
Current International
Class: |
H05K
7/02 (20060101); A47f 005/00 (); A47f 005/08 () |
Field of
Search: |
;211/89,26,13,94,94.5
;339/198,198 (GI)/ ;248/314,310,361 (TF)/ |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
62,250 |
|
Nov 1913 |
|
OE |
|
287,435 |
|
Jul 1931 |
|
IT |
|
1,206,354 |
|
Aug 1959 |
|
FR |
|
Primary Examiner: Britts; Ramon S.
Claims
I claim:
1. A module mounting system comprising: a first sidewall; a second
sidewall; said first and second sidewalls having first longitudinal
grooves therein; first and second end blocks; said end blocks
having tabs therein engaging said grooves in said first and second
sidewalls; fastening means fastening said first and second
sidewalls to said first and second end blocks to position and lock
said first and second side walls in parallel relationship, spaced
apart by a distance sufficient to receive a module therebetween;
said first and second sidewalls and said first and second end
blocks defining therebetween a completely open, bottomless passage
from a first end surface of said first and second sidewalls to a
second end surface of said first and second sidewalls a thereby
providing access to both the front and the rear faces of a module
received between said sidewalls and at least one first flexure
member projecting inwardly from at least one of said sidewalls for
each module to be mounted between said sidewalls positioned
adjacent said first longitudinal grooves for engaging means on said
module to retain said module in its position between said first and
second sidewalls.
2. A module mounting system, as defined in claim 1, wherein said
first and second sidewalls each have second longitudinal grooves
therein; second flexure members, one for each of said first and
second sidewalls; said second flexure members being mounted in
associated second longitudinal grooves to engage said modules into
engagement with said first flexure members.
3. A module mounting system, as defined in claim 2, wherein said
second flexure members are tubes fabricated from a resilient
material and having a tab coupled thereto to be positioned in said
second longitudinal groove.
4. A module mounting system, as defined in claim 2, wherein said
first and second sidewalls have shoulders adjacent said second
longitudinal grooves; said shoulders and said second flexure
members acting to limit the insertion of modules between said first
and second sidewalls.
5. A module mounting system, as defined in claim 1, wherein said
first and second end blocks have a plurality of mounting holes
therein and said first and second sidewalls have a plurality of
associated mounting holes whereby fastening devices may be passed
through said mounting holes of said first and second end blocks and
said associated mounting holes of said first and second sidewalls
to mount said module mounting system to a mounting surface.
6. A module mounting system, as defined in claim 1, further
comprising an intermediate support block; said intermediate support
block having tabs thereon to engage said first longitudinal grooves
whereby said intermediate support block may be positioned along
said first and second sidewalls intermediate said end blocks to
support said first and second sidewalls and maintain their desired
spacing.
7. A module mounting system, as defined in claim 4, wherein said
module has first and second sidewalls arranged to be positioned
adjacent said first and second sidewalls of said mounting system;
said module first and second sidewalls having first portions
proportioned to fit between and be engaged by said first flexure
members; second portions proportioned to fit between said shoulders
of said first and second sidewalls and third portions proportioned
to engage said second flexure members.
8. A module mounting system as defined in claim 1, wherein said
first flexure members are positioned upon blanks placed in said
first longitudinal grooves; said first flexure members having free
ends extending in a first direction transverse to said first
longitudinal grooves and toward the opposite one of said first and
second sidewalls.
9. A module mounting system, as defined in claim 8, wherein said
first flexure members are bifurcated.
10. A module mounting system, as defined in claim 1, wherein said
first flexure members are positioned upon blanks placed in said
first longitudinal grooves; said first flexure members comprising
complementary pairs, each member of the pair having a free end, the
free ends of the pair facing each other and generally extending
toward the opposite one of said first and second sidewalls.
11. A module mounting system, as defined in claim 10, wherein each
of said flexure members is bifurcated.
12. A module mounting system, as defined in claim 10, further
comprising stop members one for each complementary flexure member
pair, positioned intermediate said flexure member complementary
pairs and upon said blanks.
13. A module mounting system, as defined in claim 1, wherein said
first flexure member is integral with a first edge defining said
first longitudinal groove, and extends into said first longitudinal
groove.
14. A module mounting system, as defined in claim 13, further
comprising second flexure members; said second flexure members
engaging said module and urging said module into intimate contact
with said first flexure members; said second flexure members are
integral with the second edge defining said second longitudinal
groove and extend into said first longitudinal groove; at least one
first and second flexure member comprising a complementary pair,
whose free ends face one another and extend generally towards the
opposite one of said first and second sidewalls.
15. A module mounting system, as defined in claim 5, wherein said
end blocks are provided with recesses adjacent said mounting holes
to accept the head portion of a fastening device, whereby said head
portion is prevented from extending beyond the surface of said
mounting system.
16. A module mounting system, as defined in claim 15, wherein said
end blocks are unitary.
17. A module mounting system, as defined in claim 1, wherein said
end blocks comprise a plurality of portions coupled together.
18. A module mounting system, as defined in claim 12, said module
is symmetrical about a center position and is severable into two
portions about said center position; each of said portions placed
in said system from opposite directions, and caused to engage each
other and said stop members whereby said module is retained in said
system by means of said complementary flexure member pairs.
19. A module mounting system, as defined in claim 1, further
comprising second flexure members, one for each of said first and
second sidewalls; each of said second flexure members being coupled
to one of said first and second sidewalls and extending
therebetween.
Description
CROSS REFERENCES TO RELATED APPLICATIONS
1. Module Mounting System by Charles W. Sosinski, Ser. No. 724,033
- filed Apr. 25, 1968
2. Module Extraction Tool by Charles W. Sosinski, Ser. No. 731,671
- filed Apr. 26, 1968
3. Module - By Charles W. Sosinski, Ser. No. 750,265 - filed Aug.
5, 1968
4. Module System by Charles W. Sosinski, Ser. No. 756,254 - filed
Aug. 29, 1968
BACKGROUND OF THE INVENTION
l. Field of the Invention
The invention is directed to the field of rack or rail mounting of
component modules, which either contain components of an electronic
system or which contain the interconnection modules for coupling
together one or more of a plurality of individual conductors and
components.
2. Description of the Prior Art
Modular mounting systems, as are presently known in the prior art,
employ either two shallow U-shaped channels to support, and mount,
individual modules or a single large U-shaped support member. In
the former arrangement, that of the two shallow U-shaped channels,
the first of these channels is arranged to fit at the bottom of the
module while the second fits over the module top, both with the
straight portions of the U engaging portions of the back and front
faces of the module. A number of modules are arranged along the
lower rail and the top rail is then placed atop the modules.
Mounting blocks are then inserted at the ends of the two rails in
order to hold the rails in engagement with the modules and to
facilitate the mounting of the entire module support system. To
prevent bowing of the support rail, which would permit the unwanted
removal or falling out of the modules, it is necessary to put
additional support blocks along the length of the support rails.
The removal, or insertion, of individual ones of modules within the
support system is made difficult because of the presence of the
overhanging lips which engage the front and rear faces of the
modules themselves and the mounting hardware. It is necessary, in
order to remove individual modules, or to insert modules after the
rails have been assembled, to remove the assembly entirely from the
mounting surface, remove one end block and perhaps one or more of
the intermediate support blocks and then slide the modules free of
the ends of the rails. All service, which the modules on the rail
would provide, is disrupted during the time the modules are
inserted or replaced.
The further approach of the mounting of the individual modules is
the use of a U-shaped channel which surrounds the sides and front
surfaces of the module and has overhanging lips which seize the
back of the module. The modules are supported, and positioned
within the rails, by means of end blocks which are also used to
fasten the rail to a mounting surface. In order to minimize the
amount of block removal and disruption of service, slots are placed
along the overhanging front edges at various positions along them
so that only one or more of the adjacent modules will have to be
disrupted in order to remove or insert any desired module. However,
due to high packing density it may also be necessary to remove the
rail from a mounting surface, remove one of the end blocks and then
remove one or more modules in order to remove, or insert, a further
module.
SUMMARY OF THE INVENTION
The present invention seeks to overcome the difficulties noted
above with respect to prior art devices by providing a modular
mounting system which mounts and supports the modules and which
permits the easy insertion, or removal, of a single module, or any
number of modules without disturbing the adjacent modules and
without requiring that the entire mounting system be removed from a
mounting surface. In addition, the module mounting system of the
invention provides for feed-through, or double faced modules,
permitting the interconnection of conductors, or components,
mounted on both the front and back faces of the module and
providing the necessary internal coupling therebetween. The module
mounting system provides for rigid support of a plurality of such
feed-through modules permitting individual modules to be removed,
inserted, or repositioned along the module mounting system without
disruption to other modules. It permits the module to be operated
upon from both the front and back surfaces as well as permitting
the individual removal of component portions of a single module
either from a front face or rear face without disruption to the
remaining portion of the modules.
These desired characteristics are obtained by the use of a module
mounting system wherein there are provided first and second
discrete mounting side rails which are coupled together by means of
end blocks which serve to support the side rails, establish the
spacing required for the placement of modules therebetween and
permits the mounting of the system upon a mounting surface.
Positioned within the first and second side rails are a plurality
of first flexure members which engage a step on the sidewall of the
module to lock the module into position once the module has been
properly placed between the side rails. In addition there are
provided second flexure members which bear upon portions of the
module and force the module into intimate contact with the first
flexure members to assure locking of the module within the support
mounting system. In such an arrangement unitary modules
proportioned to fit between the first and second side rails and
with recesses arranged to engage the first flexure members and
bearing surfaces to engage the second flexure surface are provided.
In a second embodiment, wherein the first and second side rails are
completely symmetrical provision is made to receive a module which
is also symmetrical about a center line and can be separated into
two component halves about such central line. The module is
introduced into the module mounting system from opposite exposed
faces of the assembled mounting system and joined to one another
limited by means of a stop arranged to limit the insertion of the
individual component portions of the module.
In a further embodiment the sides are provided with first and
second flexure members which are formed as intrical portions of the
sidewall and thus remove the necessity of providing additional
flexure members. The end blocks may take a variety of shapes in
accordance with the types of mounting desired and the type of
sidewalls employed. In addition, there are provided central
supports to lock the individual module side rails together to
maintain the desired spacing should the first and second side rails
be of extremely great length. It is therefore an object of this
invention to provide an improved form of module mounting
system.
It is yet another object of this invention to provide an improved
form of module mounting system for feed-through modules.
It is still another object of this invention to provide an improved
module mounting system wherein individual ones of the modules may
be inserted, removed or repositioned without disruption of service
and without disturbing adjacent modules.
It is yet another object of this invention to provide an improved
module mounting system and a unitary module having feed-through
capabilities to be mounted within the module mounting system in a
first direction and its components and interconnection so as to
utilize both a front and back face thereof.
It is yet another object of this invention to provide an improved
module mounting system where an individual component portions of
the modules can be inserted from the front and back faces and
joined within the module support system itself.
Other objects and features of the invention will be pointed out in
the following description and claims and illustrated in the
accompanying drawings, which disclose, by way of example, the
principles of the invention, and the best modes which have been
contemplated for carrying it out.
BRIEF DESCRIPTION OF THE DRAWINGS
In the Drawings:
FIG. 1 is an isometric view of a module to be employed with the
module mounting system constructed in accordance with the concepts
of the invention.
FIG. 2 is an isometric view of a portion of the module mounting
system constructed in accordance with the concepts of the invention
but with the end block removed in order to disclose the internal
details of the module mounting system.
FIG. 3 is an isometric exploded view of an end block employed to
complete the module mounting system of FIG. 2 and showing the
fasteners used to assemble the end block and side rails and
assemble the module mounting system to a support member.
FIG. 4 shows an alternative embodiment of a module to be employed
with an alternative embodiment of a module mounting system
constructed in accordance with the concepts of the invention.
FIG. 5 is an isometric view of a module mounting system constructed
in accordance with an alternative embodiment of the invention and
with the end block removed to disclose the internal details of the
module mounting system.
FIG. 6 is an isometric view of an end block employed with the
module mounting system of FIG. 5.
FIGS. 7 through 13 are isometric views of additional end blocks
employed with the module mounting systems of FIGS. 2 and 5.
FIG. 14 is an isometric view of an intermediate support member
employed with the module mounting systems of FIGS. 2 and 5.
FIG. 15 shows an alternative construction of the module mounting
system sidewalls of FIG. 5.
Similar elements are given similar reference characters in each of
the respective FIGS.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Turning now to FIG. 1 there is shown a module 20 arranged to be
positioned and engaged to a module mounting system as will be
described below in relation to FIG. 2. The modules are described in
the above cited applications 1, 2, and to which reference is hereby
made. Module 20 consists of a body portion 22 and sidewalls 24.
Positioned within the sidewall 24 is a large recess 26 which
extends for a portion of its height. At the bottom of recess 26
there is provided a step 28 whose function will be described below.
Further, communicating with the recess 26 and extending to the
bottom of the module sidewall 24 is a smaller recess 30. Chamfered
edge 32 marks the transition from the upper portion of the module
20 to the bottom portion 39 of lesser width. Mounted within the
module 20 are a plurality of cavities for receipt therein of
connection hardware to permit the coupling together of components
or electrical conductors. The cavities are sealed by means of a
rear face seal 36 which has a number of access apertures 38
therethrough.
Module 20 is arranged to be positioned between two mounting rails
40 and 42 as is shown in FIG. 2 to which reference is now made.
Mounting rails 40 and 42 are generally identical to one another and
have therein first longitudinal grooves 44. Longitudinal grooves 44
are formed in such a manner as to provide dovetail edges 46. In
addition, there is provided at the lower portion of the side rails
40 and 42 a built-up shoulder 48 which restricts the spacing
between the side rails 40 and 42 at the bottom. Along this built-up
area, or shoulder, 48, is a second longitudinal groove 50.
Positioned within the first longitudinal groove 44 is a blank 52
from which are struck a plurality of bifurcated flexure members 54.
The free ends 56, of the bifurcated flexure members 54, will extend
in a direction generally termed to be downward and inward. The
definition of downward is assumed to be towards the restricted
space portion between the side rails 40 and 42 whereas inward is
taken to be towards the longitudinal center of the assembly.
Although bifurcated flexure members 54 are shown it should be
understood that a single flexure member may be employed if such is
desired. It should also be understood, although not visible in FIG.
2, a similar flexure member 54 exists in the rail 42. Thus there
will be one pair of such flexure members 54 for each module 20
positioned between the rails. The free ends 56 of the flexure
members 54 will engage the steps 38 of the module 20 as is better
seen in FIG. 1. Chamfered edge 30 of the module will cause the
deflection of the free ends 56 of the flexure members 54 outwardly,
that is away from the longitudinal center between the rails 40 and
42 to permit the passage of the module 20 in the interspace between
the rails 40 and 42. As soon as the step 28 has passed the free end
56 of the flexure members 54, they will be permitted to return to
their initial positions thus engaging the step 28. The manner of
interconnection between such flexure members 54 and the steps 28 of
the module 20 sidewalls and the manner in which such modules may be
inserted and removed are more fully described in the above cited
applications 1 and 2 to which references is made.
Mounted within the second longitudinal groove 50 is a second
flexure member 57 which consists generally of a tubular member 58
and a tab 60. Tab 60 will be positioned within the second
longitudinal groove 50 and will permit the tubular portion 58 to
remain above the groove 50. Upon downward insertion of the module
20, between the rails 40 and 42, the tubular member 58 of the
second flexure means 57 will engage the chamfered portion 30, of
the module 20, thus limiting downward insertion of the module 20 in
the interspace between the rails 40 and 42. In addition the flexure
member 57 will exert a certain upward force upon the module 20 thus
assuring intimate contact between the free ends 56, of the flexure
members 54, and the step 28. It should be noted that the flexure
members 54 do not extend all the way to the end of the side rails
40 and 42. This is the portion wherein the end blocks will be
inserted as described below. Positioned in this portion of the side
rails 40 and 42 are mounting holes 62 and assembly holes 64.
Turning now to FIG. 3 details of a first embodiment of the end
block may be seen. End block 70 is provided with male dovetails 72
arranged to engage the overhanging edges 46 of the female dovetail
44 on side rails 40 and 42. End block 70 will be advance so that
end 74 will be flush with the end of the side rails 40 and 42 but
no overhanging occurs. After the end block 70 has been positioned
in the manner described, fastening means such as 77 (only one of
which is shown) are passed through the assembly holes 64 and into
complementary threaded apertures 76 in end block 70 to assembly the
side rails 40 and 42 to the end block 70. Although not shown, a
similar end block 70 will be assembled at the opposite end of the
side rails 40 and 42 of FIG. 2. The assembled mounting system is
now ready to be mounted upon a mounting surface. For this purpose,
recessed holes 78 are provided within the male dovetails 72 further
aperture 80 is provided in the base of end block 70, to receive a
fastening means such as screw 83, and finally an aperture 82 is
provided in a top portion of the end block 70. It should be noted
that the aperture 82 is of sufficient size to permit the passage
therethrough of the head of the fastening device so as to permit
the head to come into engagement with the material about the
aperture 80 thus preventing the head of the fastening device from
being exposed outside of the assembled mounting system. In a
similar fashion, mounting holes 62, in the side rails 40 and 42 are
also oversized so that the head of a fastening device will come to
rest around the material surrounding the aperture 78 so as not to
expose the head of the mounting device outside of the assembled
mounting system. For example; if it is desired to position a module
20 in such a position as to face the operator when the end block 70
is positioned between the side rails 40 and 42, a fastening means
can be passed through the holes 82 and thence the holes 80 of end
block 70 and the entire assembled mounting system mounted to two
upright spaced rails. Full access is then available to both the
front and the back of the module 20 as is needed.
With the devices of FIG. 1 and 2 it is quite evident, as far as
insertion or removal of the module 20 is concerned with respect to
the side rails 40 and 42, that this must be done from the module
20's rear face. In certain instances it is desirable that the
module be insertable and removable from either direction. At least,
that a portion of it be so removable. Reference is now made to FIG.
4 which depicts a module 100 composed of two identical portions 102
and 104 coupled together by means of pins connecting the various
cavities within the module 100 together. Each portion of module
100, that is 102 and 104, are identical each having a large recess
portion 106 as was described with respect to recess 26 of module 20
of FIG. 1 and a smaller recess 108, communicates with recess 106 of
module 100 forming steps 110, chamfered areas 112 extend from the
parting line 114 which provides a slight indentation with respect
to the remaining portions of the sidewalls of the module 100. At
the parting line 114 is a flexible cushion which acts to push the
respective portions 102 and 104 against their associated flexure
members 128. In the assembled condition each of the cavities (not
shown) will be extended straight through from portion 102 to
portion 104. Each will have an end seal such as 116, having
passages through the seal into the cavities such as 118.
Turning now to FIG. 5 there is shown a mounting system for
employment with the module 100 of FIG. 4. Walls 120 and 122 are
identical to one another and are symmetrical about a center line.
Dovetailed slots 124 extend along their longitudinal length and are
adapted to receive therein a blank 126 having complementary pairs
of bifurcated flexure members 128, whose free ends 130 face one
another, extend generally inwardly; that is, towards the opposite
side rails 120 and 122. Also along the blank 126 are stop members
132 approximately center the width of the dovetail slot 124. In
order to position a module 100 within the assembled mounting system
employing side rails 120 and 122, once the end blocks have been
assembled, it is necessary to separate the module 100 into its
component parts 102 and 104 and insert one each from respective top
and bottom surfaces. Module portions 102 and 104 will cause
deflection of the bifurcated flexure members 128 until such time as
free ends 130 are able to engage the steps 110. Stop member 132
will act against the chamfered portions 112 and limit the insertion
of the module portions 102 and 104 to their correct depth. In this
position the module portions 102 and 104 will be joined to form the
overall module 100 which will be locked by the combined efforts of
the flexure members 128. The cushion at the parting line 114 will
urge the module portions 102 and 104 against the flexure members
128. It should be noted again that the blank 126 does not extend to
the end of the rails 120 and 122 but stops somewhat short of them.
In this portion, there are assembly holes 134 placed on either side
of a mounting hole 136.
Turning now to FIG. 6 there is shown an end block 40 having male
dovetails 142 arranged to engage the upper and lower edges of the
dovetail slots 124 of the side rails 120 and 122. A plurality of
threaded mounting apertures 144 are provided to receive therein the
fastening devices (not shown) which are passed through the assembly
holes 134 in the side rails 120 and 122 to fasten the side rails
120 and 122 to the end block 140. Recessed mounting holes 146 are
provided in the sidewalls of the end block 140 and a bottom
mounting hole 148 is provided in the base 148. An enlarged aperture
150 is provided in the upper portion of the end block 140 to permit
the head of a fastening device to pass therethrough, as was
described with reference to aperture 82 of FIG. 3. Once the module
mounting system has been assembled; that is, with the side rails
120 and 122 assembled to the end block 140 the entire assembly may
be mounted upon two vertical support rails and the module portions
100 to -04 inserted as described above.
Turning now to FIGS. 7 through 13 other forms of end blocks can be
seen. In FIG. 7 the end block 160 is shown rotated 90.degree. with
respect to the end block 140 position shown in FIG. 6. End block
160 will have a plurality of male dovetailed tabs 162 for
engagement with the edges of the female dovetail 124 of the
mounting system of FIGS. 2 and 5. The end block 160, of FIG. 7, is
constructed of two portions; the first being a U-shaped channel
upon which are formed the male dovetailed tabs 162 and a central
portion 164. Tabs 166 are passed through apertures, not visible in
the FIG., and are crimped over to assemble the two part unit into a
unitary end block 160.
In FIG. 8 there is shown a one piece end block 170 formed with a
tab 172 which permits this end block 170 merely to mount the side
rails 120 and 122 of FIG. 5 in a position such that the faces of
the modules 100 are visible to one standing before the module
mounting system. The device of FIG. 9 is a three part end block 180
composed of identical upper and lower portions 182 joined to a
central portion 184. It presents a somewhat simpler fabrication
than the end block 140 described with reference to FIG. 6.
In FIG. 10 there is shown an end block 190 which permits the
mounting of the side rails 120 and 122 further from the mounting
surface by providing a long column 192 which may be fastened to the
mounting surface to cause the side rails 120 and 122 to extend
further from that mounting surface. FIGS. 11, 12 and 13, are other
forms of single piece end blocks, 200, 210 and 220 respectively. In
each of these, provision is made for employment of these end blocks
in mountings in the horizontal position as described above with
respect to FIG. 8 or in positions at 90.degree. rotation from that
position. End blocks of the general type shown in FIGS. 7 through
13 may be proportioned for use with the side rails of either FIGS.
2 or 5, and coupled to such side rails by appropriate means well
known in the art. FIG. 14 shows an intermediate support member 230
to be positioned anywhere along the length of an assembled mounting
system of either FIGS. 2 or 5, to prevent the unwanted separation
of rails of great length. Using such an intermediate support member
230 the rails will not be permitted to bow or if such bowing does
occur the spacing between the two side rails will be maintained so
that modules will not be removable from the mounting system except
by the normal removing techniques.
Turning now to FIG. 15 there is shown an alternative construction
of the side rails 120 and 122 of FIG. 5. In this arrangement a side
rail 240 is provided with pairs of bifurcated flexure members 242
adjacent a longitudinal groove 244. In this instance the entire
sidewall, including the bifurcated flexure members 242, are
fabricated from a single material, having the proper resilience, so
that it is unnecessary to provide additional, separate flexure
members as is necessary with the devices of FIGS. 2 and 5.
While there have been shown and described and pointed out the
fundamental novel features of the invention as applied in the
preferred embodiments, it will be understood that various omissions
and substitutions and changes of the form and details of the
devices illustrated and in their operation may be made by those
skilled in the art, without departing from the spirit of the
invention.
The embodiments of the invention in which an exclusive property or
privilege is claimed is defined as follows:
* * * * *