U.S. patent number 3,580,131 [Application Number 04/867,614] was granted by the patent office on 1971-05-25 for antifeedback device.
This patent grant is currently assigned to THE United States of America as represented by the Secretary of the Army. Invention is credited to John R. Zimmerman.
United States Patent |
3,580,131 |
Zimmerman |
May 25, 1971 |
ANTIFEEDBACK DEVICE
Abstract
A simplified antifeedback device for installation in vertically
fed belt-e ammunition supply systems is disclosed. The device
comprises a tube mounted in a cutaway portion of the feed guide in
such a manner that it is moved up and out of the way as the
ammunition belt advances, but lodges itself between links of the
ammunition belt and the cutaway portion of the feed guide when the
belt is drawn downward by gravity upon the cessation of ammunition
feed.
Inventors: |
Zimmerman; John R. (Sterling
Heights, MI) |
Assignee: |
THE United States of America as
represented by the Secretary of the Army (N/A)
|
Family
ID: |
25350129 |
Appl.
No.: |
04/867,614 |
Filed: |
October 20, 1969 |
Current U.S.
Class: |
89/34 |
Current CPC
Class: |
F41A
9/54 (20130101) |
Current International
Class: |
F41A
9/54 (20060101); F41A 9/00 (20060101); F41d
009/02 () |
Field of
Search: |
;42/50 ;89/33 (R)/
;89/33 (Drum)/ ;89/33 (B)/ ;89/33 (BA)/ ;89/33 (BB)/ ;89/33 (BC)/
;89/33 (D)/ |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Borchelt; Benjamin A.
Assistant Examiner: Bentley; Stephen C.
Claims
I claim:
1. An antifeedback device for vertically fed belt-type ammunition
supply systems comprising:
a feed guide;
a cutaway portion in a lateral portion of said feed guide bent
toward the exterior of said feed guide;
a gap in said lateral portion formed when said cutaway portion is
bent exteriorly;
a tube movably mounted in said gap, parallel to said lateral
portion and in contacting relation cutaway portion; and
a wire passing longitudinally through said tube and fastened to
said lateral portion of said feed guide beyond the opposing edges
of said gap.
2. The antifeedback device of claim 1 wherein the opposing
extremities of said wire are fastened to said lateral portion of
said feed guide beyond the opposing edges of said gap.
3. The antifeedback device of claim 2 wherein the opposing
extremeties of said wire are fastened to the exterior of said
lateral portion of said feed guide.
4. In combination:
a. an antifeedback device for vertically fed belt-type ammunition
supply systems comprising:
a feed guide;
a cutaway portion in a lateral portion of said feed guide bent
toward the exterior of said feed guide;
a gap in said lateral portion formed when said cutaway portion is
bent exteriorly;
a tube movably mounted in said gap, parallel to said lateral
portion and in contacting relation with said cutaway portion;
and
a wire passing longitudinally through said tube and fastened to
said lateral portion of said feed guide beyond the opposing edges
of said gap; and
b. a loaded ammunition feed belt made up of interconnected loaded
links which belt moves vertically within said feed guide;
said tube being rotated out of the way of said ammunition feed when
it is drawn upward by a feed mechanism and lodging between two
consecutive links of said ammunition feed belt and said cutaway
portion when said ammunition feed belt is drawn earthward upon
cessation of operation of said feed mechanism.
Description
The invention described herein may be manufactured, used, and
licensed by or for the Government for governmental purposes without
payment to me of any royalty thereon.
The present invention relates to antifeedback devices for
vertically fed ammunition systems.
The use of vertical feed systems in belt fed guns particularly in
vehicles has long caused the problem of gravity induced feedback
and consequent jamming of the ammunition when firing and hence
ammunition advance ceases.
It is therefore an object of the present invention to provide an
simplified and inexpensive device which insures elimination of
ammunition belt feedback without interference with conventional
advance of same.
Other objects and advantages of this invention will be made obvious
to those skilled in the art when the following description is
considered in relation to the accompanying drawings of which:
FIG. 1 is a perspective view of the antifeedback device of the
present invention;
FIG. 2 is a cross-sectional view of the antifeedback device of the
instant invention showing the positions of the device during
ammunition belt advance; and
FIG. 3 is a cross-sectional view of the device of the present
invention showing same in position to prevent belt feedback during
cessation of ammunition supply.
Generally the invention provides a simplified antifeedback device
for installation in vertically fed belt-type ammunition supply
systems.
As shown in FIG. 1, the device comprises a tube 14 mounted on a
wire 12 in the gap 13 formed when cutaway portion 20 in lateral
portion 11 of feed guide 10 is folded back toward the exterior of
feed guide 10. The wire 12 which passes through tube 14 is secured
to wall 11 of feed guide 10 at or beyond the opposing edges of gap
13.
As shown in FIG. 2, when ammunition 18 comprising ammunition casing
17 and charge 19 in feed belt 21, formed by joining links 16, is
fed in the direction of arrow 22, i.e., into the firing mechanism
or chamber of the respective weapon (not shown) the antifeedback
device of this invention, and specifically tube 14, rotates against
cutaway portion 20 of feed guide 10 up and out of the way, in
contacting relationship with the advancing ammunition and
ammunition belt. As shown in FIG. 2, wire 12 is preferably mounted
such that tube 14 advances upward in the direction of movement of
the ammunition and belt to a point where wire 12 is in contact with
interior surface 23 of tube 14.
No criticality is attached to this design, however, such an
arrangement permits free advance of the ammunition and ammunition
feed belt while maintaining tube 14 in a rotatively restrained
position with only limited freedom of movement. However, some other
arrangement might be substituted if this orientation causes rattle
or other inconvenience.
FIG. 3 shows the antifeedback device of this invention in
functional arrangement with ammunition feed belt 21. In this
orientation firing of the weapon advancement of ammunition and
ammunition belt have ceased and gravity tends to draw the belt and
ammunition in the direction of arrow 24. Such advancement is
inhibited by the rotation of tube 14 against cutaway portion 20
downward until it becomes engaged between two links 16 of
ammunition belt 21. In this position tube 14 is lodged between the
two links 16 and cutaway portion 20 of feed guide 10 so as to
prevent any further feedback of ammunition belt 21. Gravitational
pull against the feed belt causes tube 14 to lodge in the position
shown and hence no feedback of the ammunition is experienced.
Immediately upon commencement of firing however, as ammunition feed
progresses in the direction of arrow 22 of FIG. 2, tube 14 rotates
up and out from between the two links 16 of feed belt 21 and the
ammunition in belt 21 advances freely as shown in FIG. 2.
This very simple device thus inhibits all feedback of feed belt 21
while providing no impedance to its advancement during weapon
firing.
Furthermore, the entire system is very simple, has no actual
working parts, and requires no complex circuitry or mechanism of
any kind.
The particular materials utilized in the various members of the
device of this invention, are not critical. However, the use of a
hard plastic material for tube 14 would be preferred over the use
of a metallic tube of similar construction if it reduces noise
caused by vibration in the vehicle or weapon in conjunction with
which the device is used. Similarly, the method of securing wire 12
to lateral portion 11 of feed guide 10 is not critical, and any
conventional means for securing same may be used. The method found
to be most preferable has been to weld wire 12 at a position beyond
the opposing edges of gap 13.
The invention has been described in detail with particular
reference to preferred embodiments thereof, but it will be
understood that variations and modifications can be effected within
the spirit and scope of the invention.
* * * * *