U.S. patent number 3,745,879 [Application Number 05/105,862] was granted by the patent office on 1973-07-17 for grenade launcher bipod support.
This patent grant is currently assigned to Oy Tampella AB. Invention is credited to Niilo Kakrvo Asikainen, Esko Ilmari Koskinen.
United States Patent |
3,745,879 |
Asikainen , et al. |
July 17, 1973 |
GRENADE LAUNCHER BIPOD SUPPORT
Abstract
A grenade launcher bipod support in which the two legs of the
bipod are individually adjustable. The adjustment for each leg
includes an internally threaded adjusting sleeve into which upper
and lower portions of the legs are threaded so the legs are
adjusted in turnbuckle fashion. The upper ends of the legs are
pivotally mounted on a connector by gear segments which are in mesh
so the legs can only be pivoted simultaneously. A connecting
bracket is pivotally connected to the connector and the bracket is
in turn pivotally connected to the barrel of the grenade launcher.
Means are provided to lock both pivotal connections of the
connecting bracket as well as to lock the gear segments so the
bipod assembly remains in the position to which it is manually
set.
Inventors: |
Asikainen; Niilo Kakrvo
(Kaupinkatu, SF), Koskinen; Esko Ilmari
(Salhojankatu, SF) |
Assignee: |
Oy Tampella AB (Tampere,
SW)
|
Family
ID: |
5760430 |
Appl.
No.: |
05/105,862 |
Filed: |
January 12, 1971 |
Foreign Application Priority Data
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Jan 24, 1970 [DT] |
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P 20 03 182.7 |
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Current U.S.
Class: |
89/37.05;
89/40.06 |
Current CPC
Class: |
F41A
27/06 (20130101) |
Current International
Class: |
F41A
27/06 (20060101); F41A 27/00 (20060101); F41f
021/00 () |
Field of
Search: |
;42/94
;89/1F,1J,37B,37BA,37L,4E |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Bentley; Stephen C.
Claims
What is claimed is:
1. A grenade launcher bipod support arrangement comprising
first and second support legs, each of said legs including
screw thread means to positively adjust the length of each leg;
a connecting bracket pivotally connected to the barrel of the
launcher for movement about a first generally horizontal axis;
a connector pivotally connected to said connecting bracket for
pivotal movement about a second axis parallel to said first
axis;
means pivotally connecting said first and second legs to said
connector for pivotal movement in a direction generally parallel to
said first and second axes; and
gear means interconnecting said legs for simultaneous pivotal
movement to maintain each of said legs at the same angle relative
to said axis.
2. A grenade launcher support according to claim 1 wherein
said support further includes first selectively operable lock means
to lock said connector against pivotal movement at one of said
axes; and
second selectively operable lock means to lock said legs against
pivotal movement.
3. A grenade launcher support according to claim 2 wherein
said first lock means includes
a manually manipulable lock nut; and
said second lock means includes
a second manually manipulable lock nut.
4. A grenade launcher support arrangement according to claim 1
wherein
said gear means interconnecting said legs for simultaneously
pivotal movement includes
a first gear secured to the upper end of said first leg, and
a second gear secured to the upper end of said second leg and in
mesh with said first gear.
5. A grenade launcher support according to claim 4 wherein
said first gear is a gear segment mounted for pivotal movement
about a first axis;
said second gear is a gear segment mounted for pivotal movement
about a second axis spaced from said first axis;
said gear segments having gear teeth in mesh at a location between
said axes; and
said first and second legs being secured respectively to said first
and second gear segments at locations on the opposite side of said
pivots from said gear teeth.
6. A grenade launcher bipod support arrangement comprising
a. first and second support legs, each including separate hollow
upper and lower leg portions, said upper leg portion being
externally threaded with threads of one hand and said lower leg
portion being externally threaded with threads of the other hand, a
guide sleeve extending into said upper and lower leg portions, said
guide sleeve having a diameter to be a close sliding fit in at
least one of said leg portions, means connecting said guide sleeve
to the other of said leg portions, and a coupling sleeve adjustably
connecting said upper and lower leg portions and having internal
threads of said one hand formed in its upper portion and internal
threads of said other hand formed in its lower portion, whereby
rotating said sleeve relative to said leg portions adjusts the
length of a leg;
b. a connector connected to the barrel of the launcher for movement
relative to the barrel;
c. first means pivotally connecting the upper portions of said legs
to said connector; and
d. second means interconnecting said legs for simultaneous pivotal
movement.
7. A grenade launcher bipod support arrangement comprising
a. first and second support legs, each of said legs including means
to adjust the length of the leg;
b. intermediate connecting means pivotally connected to the barrel
of the launcher for movement about a first axis;
c. a connector pivotally connected to said intermediate connecting
means for movement about a second axis parallel to said first
axis;
d. first means pivotally connecting the upper portions of said legs
to said connector; and
e. second means interconnecting said legs for simultaneous pivotal
movement.
Description
This invention relates to grenade launchers and particularly to a
bipod support arrangement for supporting the barrel of grenade
launchers and mortars at a proper angle of elevation.
More specifically, the invention relates to a bipod support
arrangement which simplifies setting up the grenade launcher as
well as changing the elevational aiming angle of the grenade
launcher barrel.
In prior grenade launchers the barrel is supported by a bipod
including a pair of legs which maintain the barrel at a desired
elevational angle. The legs are usually pivotally connected to an
intermediate elevating device secured to the barrel. Customarily,
the elevating device takes the form of a screw or spindle which is
adjusted to set the angle of elevation of the barrel. The
disadvantage of such a construction is that the extent of
adjustment of the screw or spindle is usually not adequate to set
the barrel to all desired angles of elevation, especially where the
terrain is very uneven. This problem cannot be overcome by
increasing the length of the adjusting device, since increasing
this length requires shorter support legs, and using shorter
support legs for the bipod limits the distance the legs can be
spread apart with the result that there is insufficient lateral
support for the grenade launcher.
The object of this invention is a bipod support arrangement for
grenade launcher barrels and the like which provides a substantial
range of elevational adjustment for the barrel, but without
impairing the lateral stability of the grenade launcher in its
customary three point support at the two legs and the barrel.
In accordance with the invention the bipod includes a pair of legs
pivotally connected to an intermediate link which in turn is
pivotally connected to the grenade launcher barrel. Each leg is of
the telescoping type which can be positively adjusted
longitudinally, and the upper ends of the legs are interconnected
by gear segments so both legs must be moved simultaneously.
The arrangement of this invention provides the advantage that each
of the bipod legs is of substantial length whereas the intermediate
or connecting link to which the legs are connected can be
relatively short. The advantage of long support legs is that the
legs can be spread apart a substantial distance when the grenade
launcher is set up, and correspondingly, the lateral stability of
the barrel is considerably improved. The advantage of the gear
segment arrangement is that after the grenade launcher is initially
set up and bedded or fired in, it is virtually impossible to adjust
the legs unequally even though the length adjustment of the legs is
made individually. Correspondingly, there is little, if any, danger
that the azimuthal adjustment of the barrel will be disturbed when
the elevational angle of the barrel is adjusted by adjusting the
length of the supporting legs. In addition, since there is an
adjusting spindle associated with each leg, stresses resulting from
firing the grenade launcher are distributed over two spindles,
rather than one. While the manner in which and the mechanism by
which the length of the legs is adjusted can of course be
accomplished in many ways, it is preferred to provide legs with
separate upper and lower threaded portions threaded into a sleeve
so the length of each leg is adjusted in a manner similar to that
of a turnbuckle. The threads on the upper and lower portions of the
legs are of course of opposite hand and the sleeve has threads of
one hand in its upper portion and of the other hand in its lower
portion so rotating the sleeve relative to the leg portions causes
the leg to shorten or elongate. The upper and lower leg sections
advantageously take the form of hollow sleeves which are guided
relative to each other by a guide sleeve that extends a substantial
distance through both the upper and lower leg sleeves.
An additional advantage of the gear segment connection between the
legs is that this segment assures that both legs will be adjusted
to the same angle relative to a vertical plane passing between the
legs. Hence, equal lateral support of the barrel is assured. In the
preferred arrangement, the gear segments take the form of double
arm levers with the respective legs connected to the segments at
one side of the pivot points for the segments and the teeth meshing
with each other at the other side of the pivot point for the
segments. The extent of pivotal movement of the segments, and
correspondingly, the support legs connected to the segments, is
advantageously limited by stops.
Numerous other features, objects, and advantages of the invention
will become apparent with reference to the drawings which show a
preferred embodiment, and in which:
FIG. 1 is a diagrammatic side elevational view of a grenade
launcher including the bipod arrangement of this invention;
FIG. 2 is a partial view in front elevation of the grenade launcher
of FIG. 1;
FIG. 3 is an enlarged view in section taken along line III -- III
of FIG. 2; and
FIG. 4 is a longitudinal sectional view of a support leg of the
bipod showing the details of the leg adjustment arrangement.
While the preferred embodiment of this invention will now be
described with reference to the grenade launcher shown in the
drawings, it is to be understood that the invention also has
utility with other projectile lauching devices such as mortars and
the like. The grenade launcher 1 shown at FIG. 1 has a projectile
launching barrel 2 with a spherical shaped lower end 3. A base
plate 4 has a spherical socket 5 to receive spherical end 3 so
barrel 2 is supported on the base for universal pivotal
movement.
The upper end of barrel 2 is supported by a bipod assembly 6 via a
connecting bracket 7 which is connected to the transversely
extending spaced apart lugs 8a of a clamp sleeve 8, by a bolt 9
which pivotally connects bracket 7 to the lugs. The usual sight on
aiming assembly 10 is also mounted on the sleeve 8. Clamp sleeve 8
is secured to barrel 2.
Bipod assembly 6 includes a first leg assembly 11 and a second leg
assembly 12. Connected to the lower ends of the respective leg
assemblies 11 and 12 are baseplate feet 13 and 14, respectively.
Bipod assembly 6 also includes a connector assembly 15 to which leg
assemblies 11 and 12 are connected, the connector assembly having
its upper end terminating at a sleeve 15a via which the connector
assembly is pivotally connected to connecting bracket 7.
Leg assemblies 11 and 12 are identical. With reference to FIGS. 2
and 4, leg assembly 12 includes a hollow cylindrical or tubular
upper leg portion 16 having an enlarged hollow cylindrical end 17
with external threads 17a. Leg assembly 12 also includes a lower
hollow cylindrical or tubular leg portion 18 having an enlarged
hollow cylindrical upper end portion 19 with external thread 19a
formed on the cylindrical portion. Upper leg portion 16 and lower
leg portion 18 extend into an elongated connecting sleeve 20 as
shown at FIGS. 2 and 4. The upper portion of the inside of sleeve
20 has internal threads 21 formed therein, which threads are of one
hand, for example, left hand threads. The lower portion of sleeve
20 has threads 22 formed therein of the opposite hand from the
threads 21 and are, for example, right hand threads.
Correspondingly, threads 17a of upper leg portion 16 are left hand
threads, and threads 19a of lower leg portion 18 are right hand
threads. The upper internal threads of sleeve 20 are separated from
the lower internal threads 22 at an enlarged internal diameter 22a
of the sleeve at a location midway between the ends of the
sleeve.
Upper leg portion 16 and lower leg portion 18 each have the same
inside diameter. A thin walled guide sleeve 23 extends from the
lower end of lower leg portion 18 to a location adjacent the upper
end of upper leg portion 16, when the leg assembly is in its
substantially contracted position, as shown at FIG. 4. Guide sleeve
23 is connected to the lower leg portion 18 against rotation by a
pin or rivet 24 which extends into an elongated vertical slot 24a
formed in sleeve 23. Advantageously, the upper end of sleeve 23 is
a close fit in upper leg portion 16 so the upper and lower leg
portions are restrained against rotation relative to each other but
can freely move axially when sleeve 20 is rotated. Guide sleeve 23
functions to stiffen the connection between the upper and lower leg
portions and the sleeve 20 and maintains these leg portions in
alignment with each other even though the threaded cylindrical
portions 17 and 19 are relatively short. The upper end of sleeve 20
is provided with a cap 23a containing an annular seal which
prevents earth and other debris from entering the internally
threaded portion of the sleeve 20. Sleeve 20 is externally knurled
to facilitate rotating the sleeve to adjust the length of a leg
assembly.
With reference to FIGS. 2 and 3, the upper portion 16 of leg
assembly 11 is connected to a gear segment 25 whereas the upper
portion 16 of leg assebly 12 is connected to a gear segment 26.
Gear segments 25 and 26 have spur teeth 27 and 28, respectively,
which mesh with each other. Gear segments 25 and 26 are mounted for
rotation on connector assembly 15 at pivot connections 29 and 30,
respectively. It will be observed with reference to FIG. 2 that
gear segment 25 has an outer end portion 25a at the opposite side
of pivot connection 29 from teeth 27 and that gear segment 26 has
an outer end portion 26a on the opposite of pivot connection 30
from teeth 28. The upper end of upper portion 16 of leg assembly 12
is secured to outer portion 26a of gear segment 26 in the manner
shown at FIG. 2 by a nut which is threaded onto the threaded upper
tip of the leg portion. Leg assembly 11 is similarly secured to
outer portion 25a of gear segment 25. By virtue of the gear
segments, leg assemblies 11 and 12 can only pivot
simultaneously.
With reference to FIGS. 2 and 3, connector 15 includes a pair of
parallel front and rear plates 30a and 31a which are connected to a
neck portion 32a of connector assembly 15. Secured to the upper end
of the neck portion 32a is the sleeve 15a via which the connector
assembly is pivotally connected to connecting bracket 7. Gear
segments 25 and 26 are mounted for rotation between the plates 30a
and 31a. As shown at FIG. 3, for the gear segment 25, the segment
has a thickness at a hub portion 33a which is approximately equal
to the distance between the plates 30a and 31a. The pivot
connection 29 for gear segment 25 includes a bushing 31 which
extends through the plate 31a and into the bore of the hub 33a of
gear segment 25. Bushing 31 has an enlarged head, and the length of
the body of the bushing from the inside surface of the head is
slightly less than the relaxed distance between plates 30a and 31a.
Extending through the bushing is a bolt 32 with an enlarged head,
which bolt is threaded into a nut 33. When head 34a of the bolt is
turned in a tightening direction, plates 30a and 31a are moved
slightly toward each other to clamp against hub 33a of the gear
segment and thereby lock the gear segment against rotation. The
extent of pivotal movement of gear segments 25 and 26 is limited by
a pair of stop tabs 34. As shown at FIG. 3, stop tab 34 is bent
inwardly from plate 30a toward plate 31a and extends into the path
of travel of gear segment 25 so the extent to which the leg
assemblies can be spread apart is limited by engagement of the end
of the gear segment with the tab.
Connecting bracket 7 includes a pair of connecting arms which are
secured to an elongated tubular casing 36 at their lower ends and
to a sleeve 37 at their upper ends. The arrangement is such that
casing 36 is parallel with sleeve 37. Extending through the sleeve
36 is an axle pin or bolt 35 which also extends through the sleeve
15a pivotally connect connector assembly 15 to connector bracket 7.
The upper end of the neck 32a of the connector bracket is secured
to sleeve 15a and extends through a downwardly opening slot in
casing 36 of sufficient circumferential extent to provide for
pivotal movement. Sleeve 15a is secured to the bolt 35. When knob
or nut 39 is tightened, the friction between the end of the bolt
and the inside face of the knob on casing 36 locks the bolt and
correspondingly the sleeve 15a against rotation. Casing 36 can also
house the azimuthal adjustment mechanism for the barrel 2.
The sleeve 37 at the upper end of the legs of connecting assembly 7
extends between the lugs 8a of the clamp sleeve 8. Sleeve 37 is
pivotally connected to the lugs by a bolt 9 which extends through
the sleeve and the aligned openings in the lugs. Lugs 8a are
relatively thin and hence, are inherently somewhat flexible. Hence,
tightening knob 40 which is threaded onto an end of shaft 9
compresses the lugs into frictional engagement with the ends of
sleeve 37 to lock the sleeve 37 and correspondingly the connecting
bracket 7 against pivotal movement relative to barrel 2.
OPERATION
Operation and use of the grenade launcher provided with the
improved bipod assembly 6 of this invention will now be explained.
When the grenade launcher is being transported or carried, the leg
assemblies 11 and 12 are pivoted inwardly toward each other and
toward the barrel so the legs are generally parallel with the
barrel 2. To set up the grenade launcher for firing, it is merely
necessary to spread the leg assemblies 11 and 12 to the position of
FIG. 2, which position is automatically predetermined by the stop
tabs 34 which limit the extent to which the legs can be spread
apart. By virtue of the action of gear segments 25 and 26, both
legs are spread apart to extend at the same angle relative to a
vertical plane including barrel 2 (assuming of course that the
barrel is in its centered aximuthal position), whether or not stop
tabs 34 are engaged. Normally, however, the legs will be spread
apart until the segments 25 and 26 do engage the stop tabs 34 of
connector assembly 15. The leg assemblies are locked in this
position by tightening the nut 34a to lock the gear segments
against pivotal movement. Feet 13 and 14 are then embedded in the
earth as shown at FIG. 2, and base 4 is similarly bedded. The
aiming device 10 is then used to determine the proper angle of
elevation of the barrel and the barrel is then set to the proper
elevational angle by rotating the sleeves 20 of each leg assembly.
During the adjustment of the length of the leg assemblies pivotal
movement between the barrel and the leg assemblies occurs at shaft
35 and bolt 9. As soon as the proper angle of elevation of the
barrel is obtained, knobs 39 and 40 are tightened to lock the
assembly in position.
It will be appreciated that where the terrain is uneven, leg
assembly 11 for example, may be adjusted to a length considerably
shorter than the legs of leg assembly 12, for example where the
foot 13 is embedded in an elevated mound. However, after the legs
are spread and bedded, the user of the launcher will find that
elongating one leg assembly will tend to lift the other leg
assembly and correspondingly, he will adjust the two leg assemblies
simultaneously to the proper length to firmly support the upper end
of the barrel both vertically and laterally.
While a preferred embodiment of the bipod and support arrangement
for a grenade launcher has been shown and described in detail, it
is to be understood that numerous changes can be made without
departing from the scope of this invention as defined herein and in
the appended claims.
* * * * *