U.S. patent number 3,604,069 [Application Number 05/024,495] was granted by the patent office on 1971-09-14 for cable strain relief device.
This patent grant is currently assigned to Pacific Plantronics, Inc.. Invention is credited to Wolfgang W. Jensen.
United States Patent |
3,604,069 |
Jensen |
September 14, 1971 |
CABLE STRAIN RELIEF DEVICE
Abstract
A strain relief device for supporting a cable used with a
communications headset of the type worn on a user's ear. The device
provides freedom of movement and relief from strain resulting from
the weight of the cable. A transversely bored plunger is slidably
mounted in a transversely bored housing with slots provided through
these two parts for receiving the cable. The plunger is yieldably
urged in a direction to releasably grip the cable in the desired
position when the housing is clipped to the user's wearing apparel.
The device facilitates rapid adjustment of cable position by either
sliding the cable relative to the housing, or pivoting the housing
with respect to the clip. Means are provided to prevent unintended
separation of the cable from the device during this adjustment.
Inventors: |
Jensen; Wolfgang W. (Capitola,
CA) |
Assignee: |
Pacific Plantronics, Inc.
(Santa Cruz, CA)
|
Family
ID: |
21820877 |
Appl.
No.: |
05/024,495 |
Filed: |
April 1, 1970 |
Current U.S.
Class: |
24/332; 24/115G;
24/600.6 |
Current CPC
Class: |
A44B
99/00 (20130101); H04M 1/15 (20130101); Y10T
24/3984 (20150115); Y10T 24/45393 (20150115); Y10T
24/3435 (20150115) |
Current International
Class: |
A44B
21/00 (20060101); H04M 1/15 (20060101); A44b
021/00 (); A44b 013/02 () |
Field of
Search: |
;24/73SH,81HS,81DC,73,81,49K,239 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Griffin; Donald A.
Claims
While the foregoing embodiment is considered to be preferred, it is
understood that numerous variations in the details and arrangement
of parts, which have been described and illustrated in order to
explain the nature of the invention, may be made by those skilled
in the art within the spirit and scope of the invention as
expressed in the appended claims.
1. A device for adjustably supporting a cable on the wearing
apparel of a user, the device including the combination of: a
housing having a cavity defining a closed end and an open end, the
housing being formed with a transverse bore for receiving a length
of the cable and a slot through a side of the housing extending
into the bore on a side thereof remote from the closed end; a
plunger slidably mounted in the housing cavity for movement between
a cable gripping position and a cable releasing position, the
plunger being formed with a transverse bore for receiving the
length of cable and a slot on a side of the plunger extending to
the plunger bore on a side thereof remote from the housing open
end; clip means secured to the housing to releasably engage a
portion of said wearing apparel; and, means yieldably urging the
plunger to its gripping position to releasably lock the cable
between the plunger and housing bores.
2. The invention of claim 1 and further characterized in that said
clip means is rotatably mounted with respect to said housing for
selective adjustment of the angular position of the length of cable
with respect to the clip means.
3. The invention of claim 1 and further including means pivotally
mounting said housing on the clip means, and means yieldably
holding said housing in gripping relationship on the clip means to
permit selective pivotal adjustment of the housing and length of
cable with respect to the clip means.
4. The invention of claim 3 and further characterized in that said
housing includes a stud projecting outwardly on a side
substantially opposite of said housing slot, said clip means
includes an opening mounted over said stud, and said yieldable
means includes a locking ring retaining said stud within the clip
means opening.
5. The invention of claim 1 and further including stop means to
limit inward displacement of said plunger with respect to said
housing to a position where the plunger slot is moved in relation
to the housing slot precluding unintended separation of the cable
from the cable releasing position.
6. The invention of claim 5 and further characterized in that said
stop means includes a circumferential shoulder on the distal end of
said plunger, said shoulder axially spaced from the housing open
end in said cable gripping position of the plunger, and engaging
said open end in said cable releasing position.
Description
BACKGROUND OF THE INVENTION
Headsets have been provided for radio telephone operators, aircraft
crewmen, or other personnel for use in communications systems.
These headsets have either been mounted to the user's head by means
of a headband or other supporting arrangement, or have been of the
self-supporting type adapted to fit over the user's ear. The cable
carrying the leads to the headset typically extends from the
headset and hangs freely across the body of the user. The weight of
this cable pulling against the headset is somewhat uncomfortable to
the user, especially where the headset is used over a long period
of time. Moreover, where the user is active and moves his body or
turns his head frequently throughout his work activities, then the
freely hanging cable oftentimes interferes with his movements and
is otherwise a nuisance. The expediency of merely affixing the
cable to the user's wearing apparel is not entirely satisfactory
where the user changes positions frequently, since this requires
adjusting and readjusting of the free length of the cable. Thus,
the need has been recognized for a small, simple and inexpensive
device for supporting a headset cable in a manner relieving the
strain or weight of the cable from the user's head, and also which
facilitates easy and fast adjustment of cable position and
length.
SUMMARY OF THE INVENTION AND OBJECTS
It is a general object of the invention to provide a new and
improved cable strain relief device for use with communications
headsets.
Another object is to provide a device of the type described
supporting a headset cable to the apparel of a user and relieving
cable weight from the user's head for improved comfort and reduced
fatigue.
Another object is to provide a cable strain relief device
releasably attached to the apparel of the user and which releasably
holds the cable in a position which is readily and easily adjusted
through both lengthwise and pivoting adjustments.
Another object is to provide a cable strain relief device of the
type described bed which is relatively small and light weight,
inexpensive, and comprises a relatively small number of parts.
The invention provides a housing and plunger formed with transverse
bores which, when aligned, receive the headset cable. Slots in the
housing and plunger facilitate insertion and removal of the cable.
A spring in the housing urges the plunger in a direction for
gripping the cable against the housing. A stop on the plunger end
limits plunger travel to prevent unintended separation of the cable
from the housing. Inward displacement of the plunger provides
lengthwise adjustment of the cable, while rotation of the housing
with respect to a mounting clip provides angular adjustment .
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view illustrating a cable strain relief
device incorporating features of the invention shown in position on
the wearing apparel of a user;
FIG. 2 is an enlarged perspective view of the strain relief device
illustrating the use thereof in supporting a headset cable;
FIG. 3 is a side elevational view of the strain relief device shown
in gripping relationship with a cable; and,
FIG. 4 is a side elevational view, partially in axial cross
section, of the strain relief device.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawings and particularly FIG. 1 a strain
relief device in accordance with the invention is illustrated
generally at 10. This device is clipped to the coat edge or lapel
12 of a user 14 for supporting a headset cable 16. The cable
depends from a communications headset 18, shown in phantom view as
mounted above the user's ear. Headset 18 may be of the
self-supporting type illustrated in copending application Ser. No.
839,016, filed July 3, 1969. This type of headset is adapted to be
supported on the user's ear with a voice tube 20 having its distal
end extending to the user's mouth and an acoustic tube 22
insertable into the auditory canal of the user. Cable 16 supplies
electrical signals through leads connected with microphone and
receiver transducers within the housing of the headset.
Referring to FIG. 2 strain relief device 10 is illustrated in
greater detail. Device 10 comprises a cable gripping housing
assembly 24 pivotally mounted on a clip assembly 26. Assembly 24 is
adapted to releasably grip headset cable 16 for carrying a part of
the cable weight when the clip assembly is secured to the user's
wearing apparel.
FIGS. 3 and 4 illustrate details of the component elements of
device 10. Cable gripping assembly 24 comprises a housing 28, shown
as cylindrical, defining an internal cavity 29 having a closed end
30 and an open end 32. A transverse bore 34 is formed through the
walls of the housing and is of a diameter sized to cradle or
receive headset cable 16, as best illustrated in FIG. 3. A
transverse slot 36 is formed through a side of the housing and
extends into the bore on the side thereof remote from housing open
end 32. Slot 36 is sized with a width adapted to freely permit
insertion and removal of the cable. A square boss 38 is molded
integral with housing 28 on a side thereof remote from the opening
defined by housing slot 36. An integral stud 40 projects from boss
38, and this stud is formed with a locking shoulder 42.
A slide or plunger 44, shown as cylindrical, is mounted for sliding
movement within housing cavity 29. A transverse bore 46 is formed
in the housing with a diameter sized to cradle the cable, as shown
in FIG. 3. A transverse slot 48 is formed on a side of the plunger
for registry with housing slot 36, and extends into bore 46 on a
side thereof remote from housing open end 32. An operating button
50 is provided with a skirt 51 defining an internal bore for
mounting on a reduced projecting end 52 of the plunger. A
self-threading screw 55 is provided to lock the button on the
plunger.
The circumferential shoulder 56 of the button cooperates with
housing open end 32 in a manner preventing unintended or complete
release of the cable from the housing. In the cable gripping
position of FIG. 3, shoulder 56 is spaced from housing end 32. For
release and longitudinal adjustment of the cable, button 50 is
pressed and the plunger displaced inwardly until shoulder 56 stops
against the housing. At this point the cable is free to slide along
bores 34 and 46 to the desired new position, but right-hand edge of
plunger slot 48 has not cleared the left-hand edge of housing slot
36 sufficient to permit removal of the cable through these
slots.
Means are provided to yieldably urge plunger 44 in a direction
tending to move it out of housing cavity 29. This means may
comprise the illustrated compression spring 58 mounted between
housing end wall 30 and plunger 44. With a length of the cable in
place in the aligned bores of the plunger and housing, spring 58 is
effective to urge the plunger outwardly for firmly gripping the
cable.
Clip assembly 26 comprises a pair of jaws 60,62 pivotally mounted
together by means of rivet or fastener 64. A coil spring 66 is
mounted on fastener 64 with its outwardly projecting ends yieldably
urging the clip jaws together at gripping end 68 in a conventional
manner for releasably gripping the user's wearing apparel. An
opening 70 is provided in upper jaw 60 for mounting the clip
assembly over locking shoulder 42 of stud 40. Means are provided
for resiliently locking the clip assembly to the strain relief
device 10. A variety of means would be satisfactory, but preferably
a resilient locking ring 72, which may be, for example, a bowed
E-ring, is mounted between locking shoulder 42 and the inner
surface of jaw 60. The resiliency of E-ring 72 acting against the
locking shoulder urges jaw 60 into releasable engagement with the
flat surface of housing boss 38. This insures that the selected
pivotal position of housing 24 with respect to clip assembly 26 is
maintained so that the cable extends in the most comfortable
position on the wearer's body. At the same time, the user can
easily readjust this positioning by turning the housing with
respect to the clip assembly.
For initial assembly and installation on a cable, spring 58 and
plunger 44 are mounted in housing cavity 29. The plunger is pushed
inwardly far enough to allow the cable to be inserted through the
plunger and housing slots. The plunger is then released to permit
the spring force to clamp the cable, and button 50 is then fastened
on the end of the plunger by screw 55 preventing complete release
of the cable.
In use of the strain relief device 10, assume that a cable has been
installed and is gripped as illustrated in FIG. 3. For lengthwise
adjustment of the cable, the user may easily grasp housing assembly
24 in one hand and move plunger 44 into the housing against the
force of spring 58 until the cable is released. The user then
slides the cable to the desired position, releases the plunger, and
the cable is again gripped in the new position. The force of spring
58 is effective to move the plunger outwardly and carry the cable
into its seated position on the semicircular portions of housing
bore 34. The yieldable force of the spring retains the cable in
locking engagement between plunger bore 46 and housing bore 34.
Jaws 60,62 of clip assembly 26 are opened for clipping device 10 to
the desired position on the user's wearing apparel providing
sufficient cable length between the headset and strain relief
device for adequate freedom of movement and comfort. If the user
desires to readjust this free cable length, he merely pushes
plunger 44 into the housing for releasing cable 16. The cable is
then moved lengthwise to the desired position and the plunger is
released so that the cable is locked in the most comfortable
position. The user may then adjust, if necessary, the angular
position of cable 16 by turning housing 24 with respect to clip
assembly 26.
From the foregoing it is apparent that there has been provided a
new and improved strain relief device for supporting a headset
cable to the wearing apparel of a user. The elements are relatively
small, simple and inexpensive to build. In user, the major portion
of the weight of the headset cable is supported through a clip
arrangement on the user's wearing apparel to reduce the user's
fatigue. The cable is maintained in the desired position on the
user permitting freedom of body movement without interference from
the cable. The cable position with respect to the clip assembly is
readily adjusted through both lengthwise and pivotal positioning.
Means is provided to prevent unintended separation of the cable
from the device.
* * * * *