U.S. patent number 3,766,677 [Application Number 05/178,268] was granted by the patent office on 1973-10-23 for pivotal barrel and receiver assembly having a removably mounted breech block.
This patent grant is currently assigned to The Innovation Resources Corporation. Invention is credited to Richard G. Waddell.
United States Patent |
3,766,677 |
Waddell |
October 23, 1973 |
PIVOTAL BARREL AND RECEIVER ASSEMBLY HAVING A REMOVABLY MOUNTED
BREECH BLOCK
Abstract
A double-barreled firearm of the over-under barrel configuration
utilizing a break-open type action wherein the barrels are hinged
on trunnions fixed to the receiver. The receiver is formed with a
top and two parallel depending sides having a machined channel
therein for slidably receiving a removable breech block. Openings
are provided in the breech block for passage of barrel locks
extending past the breech face and engaging detents in the breech
end of the barrel housing. A removable trigger group is releasably
secured to the bottom of the receiver and includes a trigger, a
sear actuator, a pair of sears, and a pair of hammers; a
selector/safe carriage is also provided within the trigger group
and is slidably positionable to select either of the sears for
actuation while automatically locking the non-selected sear. The
selector/safe carriage may also be positioned to lock the trigger
to prevent firing of either barrel. The positioning of the
selector/safe carriage is achieved through the utilization of a
pivoted cam actuated by a manual safe/selector switch located on
top of the receiver. A release lever is also positioned on the top
of the receiver for withdrawing the barrel locks from the detents
in the barrel housing; an extension having a camming surface is
secured to the barrel locks for engaging the cam following surface
on the selector/safe mechanism to automatically position the latter
in the same position at any time the barrel locks are disengaged
from the barrel housing. The distance from the trunnions to the
machined channels in the receiver is accurately controlled to thus
permit interchangeability of different size barrels with a given
receiver.
Inventors: |
Waddell; Richard G. (Phoenix,
AZ) |
Assignee: |
The Innovation Resources
Corporation (Phoenix, AZ)
|
Family
ID: |
22651879 |
Appl.
No.: |
05/178,268 |
Filed: |
September 7, 1971 |
Current U.S.
Class: |
42/75.04; 42/40;
42/42.01; 42/44 |
Current CPC
Class: |
F41C
7/11 (20130101); F41A 15/06 (20130101); F41A
3/58 (20130101); F41A 19/21 (20130101) |
Current International
Class: |
F41A
19/00 (20060101); F41A 15/06 (20060101); F41C
7/11 (20060101); F41A 15/00 (20060101); F41A
3/58 (20060101); F41A 19/21 (20060101); F41A
3/00 (20060101); F41C 7/00 (20060101); F41c
007/00 (); F41c 011/00 (); F41c 011/08 () |
Field of
Search: |
;42/40,8,44,75D |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
237,657 |
|
Aug 1925 |
|
GB |
|
1,280,514 |
|
Nov 1961 |
|
FR |
|
Primary Examiner: Borchelt; Banjamin A.
Assistant Examiner: Jordan; C. T.
Claims
I claim:
1. In a firearm, the combination comprising: a receiver having a
top and two side plates, said side plates extending downwardly from
said top and forwardly thereof to form an open top barrel receiving
channel; a pair of oppositely disposed trunnions, one in each
forwardly extended side plate for receiving a barrel pivotally
supported by said trunnions; a pair of oppositely disposed machined
channels, one formed in each side plate, said machine channels
opening toward each other and positioned beneath said top and at
predetermined distances from said trunnions, said machined channels
extending substantially transverse to the axis of a barrel
positioned in said barrel receiving channel; a breech block
extending between and removably positioned in said machined
channels and having a breech face for abutting the breech end of
the barrel, said breech block remaining stationary during
functioning of the firearm; means removably securing said breech
block in said machined channels; locking means for locking said
barrel in a position with the breech end thereof opposite said
breech face.
2. The combination set forth in claim 1, wherein said machined
channels are rectangular in cross section and extend downwardly
from beneath said top to receive and position said breech block
from the bottom of said receiver.
3. The combination set forth in claim 1, including a firing pin
mounted within said breech block and means for retaining said
firing pin in said breech block.
4. The combination set forth in claim 1, wherein said breech block
incorporates a pair of oppositely disposed L-shaped shoulders
extending perpendicular to said breech face, each positioned
adjacent a side and top of said breech block; said shoulders
forming, with said receiver sides and top, two rectangular openings
extending perpendicularly through said breech face and breech
block, and wherein said locking means comprises a pair of locking
arms slidably mounted in said rectangular openings and
spring-biased to extend outwardly of said breech face for engaging
the breech end of said barrel and holding said barrel in a closed
position.
5. The combination set forth in claim 1, wherein said breech block
incorporates at least one opening extending therethrough
perpendicular to said breech face and wherein said locking means
comprises a locking arm slidably mounted in said opening and
spring-biased to extend outwardly of said breech face for engaging
the breech end of said barrel and holding said barrel in a closed
rectangular position.
6. The combination set forth in claim 2, including a firing pin
mounted within said breech block and means for retaining said
firing pin in said breech block.
7. The combination set forth in claim 2, wherein said breech block
incorporates a pair of oppositely disposed L-shaped shoulders
extending perpendicular to said breech face, each positioned
adjacent a side and top of said breech block; said shoulders
forming, with said receiver sides and top, two rectangular openings
extending perpendicularly through said breech face and breech
block, and wherein said locking means comprises a pair of locking
arms slidably mounted in said rectangular openings and
spring-biased to extend outwardly of said breech face for engaging
the breech end of said barrel and holding said barrel in a closed
rectangular position.
8. The combination set forth in claim 2, wherein said breech block
incorporates at least one opening extending therethrough
perpendicular to said breech face and wherein said locking means
comprises a locking arm slidably mounted in said opening and
spring-biased to extend outwardly of said breech face for engaging
the breech end of said barrel and holding said barrel in a closed
rectangular position.
Description
BACKGROUND OF THE INVENTION
The present invention pertains to firearms, and more particularly,
to a break-open type firearm utilizing interchangeable barrel sets
as well as multiple barrel firearms having a barrel firing order
selection means.
Double-barreled firearms have been long known and used; the
desirability of such an arm, particularly the over-under
configuration, is evidenced by the continued demand for such arms
for an extensive number of years. However, such arms are usually
expensive as a result of the relatively large amount of
hand-fitting and manual labor involved in their manufacture. The
most common double-barreled configuration in the over-under variety
is a shotgun cartridge of the same gauge in each barrel wherein
each incorporates a different choke. The utilization of such
firearm configuration for high-powered rifle cartridges is more
limited since the pressures involved with such cartridges are more
demanding of the strength of the action and the tolerances utilized
in the manufacture of the arm.
In firearms of this type, a significant contribution to the
required labor in the manufacture thereof results from the
tolerance requirements of the head space. In break-open type
actions, particularly the over-under variety, this head space is
controlled by the distance between the trunnion pins upon which the
barrel housing is pivoted and the breech face. Since the receiver
is formed with side walls extending forwardly from the breech face
to support the trunnions, machining the breech face to close
tolerance relative to the positioning of the trunnions becomes a
very difficult task requiring the skill of a technician to hand-fit
the barrel housing to the receiver. It is well known that such
double guns may be obtained with interchangeable barrel groups;
however, such interchangeable or substitute barrels must each be
hand-fit to the individual receiver and cannot be provided as an
"off-the-shelf" accessory.
The removal of the operating mechanism of a firearm of the type
described is of critical importance in the maintenance of the
firearm. The complexity of this mechanism positioned behind the
machined breech face often necessitates the attention of a skilled
gunsmith for removal and inspection or repair. It is also desirable
to incorporate as a function of this mechanism the ability to
select a barrel for firing and to provide a means for positively
locking the sears when the firearm is placed on safe through a
conveniently positioned safety mechanism.
OBJECTS OF THE INVENTION
It is therefore an object of the present invention to provide a
firearm susceptible of using interchangeable barrels without the
necessity of fitting each barrel housing to a respective
receiver.
It is still another object of the present invention to provide a
firearm of the break-open variety wherein the distance between the
barrel hinging trunnions and the breech face may be consistently
controlled within desired limitations to provide dimensional
uniformity among successively manufactured receivers.
It is still another object of the present invention to provide a
firearm incorporating a breech block having a breech face that may
accurately be machined prior to insertion in the receiver.
It is still a further object of the present invention to provide a
firearm incorporating a breech block that may readily be removed
for inspection and/or repair.
It is a further object of the present invention to provide a
multiple barrel firearm of the break-open variety incorporating a
barrel selector mechanism that automatically provides a positive
safety when the action is broken.
It is another object of the present invention to provide a multiple
barrel firearm incorporating a selector mechanism that
automatically places the non-selected barrel into a positive safe
condition.
It is still another object of the present invention to provide a
firearm wherein the trigger-sear-hammer mechanism as well as the
selector/safe mechanism is readily removable from the receiver
without the utilization of tools.
These and other objects and advantages of the present invention
will become apparent to those skilled in the art as the description
thereof proceeds.
SUMMARY OF THE CHOSEN EMBODIMENT
Briefly, in accordance with the embodiment chosen for illustration,
an over-under firearm of the break-open type is provided with a
solid receiver having a top and depending side walls with the side
walls extending forwardly of the top to form a barrel-receiving
channel. Trunnions are fitted in the forward portion of the side
walls and a pair of opposed machined channels are formed in the
interior of the side walls beneath the receiver top. The channels
may be formed such as by broaching and slidably receive a
pre-machined breech block having firing pins mounted therein. The
breech block is secured in the receiver through the utilization of
a pin passing through the lower portion thereof. A trigger group
including a frame is secured through an opening in the bottom of
the receiver through the utilization of a latch. The trigger group
includes a pair of hammers pivotally secured to the frame and a
corresponding pair of sears. The sears incorporate extensions which
are contacted by a sear actuator for disengaging the sear with the
corresponding hammer. A selector/safe mechanism including a
selector/safe carriage is mounted in the frame on a pair of
transverse pins which permit the carriage to be positioned
laterally of the receiver. The selector/safe carriage and the sear
actuator move in unison with the selector carriage engaging either
sear extensions to place the corresponding sear, hammer, and barrel
in the safe position.
The removable breech block includes a pair of L-shaped shoulders
extending perpendicular to the breech face and which form
rectangular openings extending through the breech face and breech
block when the breech block is inserted in the receiver, the
rectangular openings or passages being bordered on the bottom and
one side by the breech block, on one side by the receiver side
plate, and on the top by the receiver top. A pair of barrel locks
slidably extend through these passages and engage detents provided
in the breech end of the barrel housing for positively locking the
barrels into a firing position. The action may be broken by
actuation of a release lever operating in either direction which
operates a cam to withdraw the barrel locks. A barrel lock
extension "cams" the selector/safe carriage to its central or safe
position, thereby placing both barrels in a positive safe position
automatically upon breaking the action. The selector/safe carriage
may be placed in a desired barrel firing position through the
utilization of a selector button extending through the top of the
receiver.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention may more readily be described by reference to
the accompanying drawings, in which:
FIG. 1 is a side elevational view of a firearm incorporating the
teachings of the present invention, showing a shotgun-over-shotgun
configuration.
FIG. 2 is a side elevational view of a barrel group of the
rifle-over-rifle configuration that may be utilized interchangeably
with the barrel group of FIG. 1.
FIG. 3 is a cross section of the barrel band utilized in the
embodiment of FIG. 2.
FIG. 4 is an exploded perspective view of the receiver utilized in
the present invention, showing the removable breech block and other
mechanism.
FIG. 5 is an exploded perspective view of the removable breech
block used in the present invention, showing the firing pins
carried by the breech block.
FIG. 6 is a partly exploded and partly sectional view of a firearm
constructed in accordance with the teachings of the present
invention.
FIG. 7 is an exploded view of the release lever and selector/safe
selection mechanism.
FIG. 8 is a side elevational view of the trigger group of the
present invention.
FIG. 9 is an end view of the apparatus of FIG. 8, looking toward
line 9--9.
FIG. 10 is an exploded perspective view of the trigger group of
FIGS. 8 and 9.
FIG. 11 is a side elevational view, partly in section and partly
exploded, of a portion of the firearm of FIG. 1.
FIG. 12 is an elevational view of the breech end of the barrel
housing of FIG. 11, viewing from line 12--12.
DETAILED DESCRIPTION OF THE DRAWINGS
Referring now to FIG. 1, the firearm shown therein is of the
over-under variety having both barrels 10 and 11 accepting shotgun
type cartridges. The barrels are permanently attached to a barrel
housing (not shown in FIG. 1) which is removably and pivotally
secured to the receiver 12 by trunnion lugs such as that shown at
14. A forearm 15 is provided which, in turn, is attached to a
forearm iron 16, the latter being secured to the barrels 10 and 11.
A trigger guard 18 surrounds a conventional trigger 19, the two
being part of a trigger group (not shown in FIG. 1) which is
removably secured in the receiver 12 by a latch mechanism actuated
by trigger group release 21.
A release lever 24 enables the action to be broken and a
selector/safe lever 25 enables the operator to select a safe
position or a position for firing either of the two barrels. A
conventional stock 26 is secured to the receiver 12 in the
well-known manner.
Referring to FIG. 2, an interchangeable barrel set is shown. The
barrel set of FIG. 2 is of the rifle-over-rifle variety wherein
each barrel accepts a rifle cartridge of any predetermined caliber;
the calibers may be the same or different. The barrels 28 and 29
are each fitted to a barrel housing 30 and are tied to each other
near the muzzle thereof by an adjustable barrel band 32. When
utilizing a rifle-over-rifle configuration, convergence of the
trajectories of the projectiles emanating from the respective
barrels becomes important. This convergence may be factory adjusted
or, as shown in FIG. 2, it may be achieved through the utilization
of the barrel band 32. The band may more readily be described by
reference to FIG. 3, wherein it may be seen that an upper ring
portion 34 is provided for surrounding the upper barrel and may be
clamped to the barrel in any convenient fashion, such as by
utilizing the already existing front sight ramp. A lower ring 36
encircles the lower barrel of the pair of barrels and is provided
with two pairs of diametrically opposed set screws 37, 38, 39, and
40. By loosening and tightening appropriate pairs of the set screws
37 - 40, the lower barrel may be "biased" to cause any desired
convergence of projectile trajectories of the two barrels.
Referring now to FIGS. 4 - 10, it may be seen that the receiver 12,
in the embodiment chosen for illustration, is machined from a
single piece of steel and incorporates a top 50 with side plates 52
and 54 extending downwardly therefrom. The side plates 52 and 54
also extend forwardly of the top 50 to form an open top barrel
receiving channel 56. The forward extending portions of the side
plates 52 and 54 are appropriately drilled to receive trunnion lugs
58 and 59; extractor cams 61 and 62 are secured adjacent the
trunnion lugs. The inside surface of the side plates 52 and 54 are
machined to provide a pair of oppositely disposed channels 64 and
65, said channels facing one another and extending generally
vertically from the bottom of the receiver 12 to adjacent the top
50 of the receiver.
An insertable breech block 70 is premachined and includes a breech
face 71 having firing pin holes 73 and 74 therein. The breech block
is slidably positioned in the channels 64 and 65 and is pinned in
place through the utilization of pin 76 extending through the side
plate 54, breech block 70, and side plate 52. The positioning of
the channels 64 and 65 with respect to the center line 78 of the
trunnions 58 and 59 may very accurately be controlled using present
machining techniques. This positioning may be achieved with a
significant degree of repeatability, thus producing receivers such
as receiver 12 having a predetermined trunnion-to-breech face
dimension well within the tolerances to accept mass-produeed barrel
sets.
The breech block 70 also includes firing pins 80 and 81 as well as
firing pin springs 82 and 83 respectively. The firing pins and
their springs are held within the breech block 70 by retaining pins
85 and 86. The pin 76 extending through the side walls 52 and 54 of
the receiver 12 and passing through the breech block 70 also acts
as a pivot pin for a cocking arm 88 and secures cover plate 90 in
place. .differential.The trigger group 100, in addition to the
trigger guard 18 and trigger 19, includes a frame 101. The trigger
19 is pivotally secured to the frame 101 by a trigger pin 103; the
actuating surface 104 of the trigger 19 engages a sear actuator 106
which is pivotally mounted to the frame 101 by pivot pin 107. A
trigger spring 108 urges the trigger in a clockwise direction as
viewed in the figures. The sear actuator 106 is positioned between
locking extensions 110 and 111 of the selector/safe carriage 112.
The selector/safe carriage 112 is also mounted on pin 107 but is
restrained from rotation or pivotal motion (such as the pivoting
motion of the sear actuator 106) by a second pin 114 passing
through slots 115 and 116 in the rear of the selector/safe carriage
112. The carriage 112 is thus free to slide transversely on the
pins 107 and 114, together with the sear actuator 106, but only the
sear actuator is free to pivot about the pin 107.
Sears 120 and 121 are mounted for pivotal movement about sear pin
123. The sears each include sear extensions 124 and 125
respectively which extend away from the sear pin 123 and permit the
respective sear to be pivoted about the sear pin by engaging the
sear actuator 106. Sear springs 128 and 129 urge the respective
sears into the hammer-engaging position; the sear springs are
maintained in position by a spring retainer block 130. The retainer
block 130 is secured to the frame 101 by sliding the block
laterally through the openings 134 and 135 provided in the frame
101. The spring retainer block 130 is also provided with openings
138 and 139 for slidably receiving hammer guide rods 140 and 141
respectively. The hammer guide rods are centrally and co-axially
positioned with respect to hammer springs such as spring 151 (only
one hammer spring is shown).
The hammer guide rods 140 and 141 include hammer-engaging tips 153
and 154 which engage hammers 155 and 156 respectively. The hammers
are pivotally secured to the frame 101 by hammer pin 160.
The frame 101 is secured in the bottom of the receiver 12 by
engaging the slightly tapered rear edge 163 with a corresponding
tapered surface 164 at the rear of the receiver 12 and pivoting the
frame upwardly until the camming surface 166 of the trigger group
release 21 engages the edge 167 of the cover plate 90. Continued
rotation of the frame 101 causes the compression of spring 169
until the trigger group release "snaps" into locking engagement
with the cover plate 90 and with the inclined surfaces 170 and 171
abutting corresponding mating surface 174 in the receiver 12.
The safety/selector lever 25 extends through the top of the
receiver and is slidable transversely of the receiver 12 in the
direction indicated by the arrow 180 (FIG. 7). This transverse
motion is transmitted to a selector/safe block 181 through a pin
182. The block is secured to the bottom surface 183 of the receiver
top 50 by a pivot pin 185 which results in a pivotal motion of the
block 181 when the selector/safe lever 25 is positioned. A selector
pin 187 is secured to the block 181 and extends downwardly
therefrom to a position between the locking extensions 110 and 111
of the selector/safe carriage 112 and over the sear actuator 106.
The transverse motion of the selector/safe lever 25 therefore
results in pivotal motion of the selector/safe block 181 and
actuator pin 187 which, in turn, results in transverse sliding
motion of the selector/safe carriage 112 on the pins 107 and 114.
Since the sear actuator 106 is also mounted between the locking
extensions 110 and 111, the former slides transversely with the
carriage 112. It may be noted that the locking extensions 110 and
111 include notches such as notch 200 which slide over the ends of
the sear extensions 124 and 125. When selector/safe carriage 112 is
positioned centrally (the "safe" position), the selector pin 187 is
in an interfering position directly over the sear actuator 106 and
prevents the actuator from being pivoted to fire either barrel.
Sliding the selector/safe carriage 112 to the left or right moves
the selector pin 187 out of interfering relation with the sear
actuator 106. It may be noted that the top of the sear actuator 106
is notched at 106a and 106b on either side of a raised center
portion 109. The pin 187 therefore prevents operation of the
actuator 106 only when the pin 187 is directly over the center
portion 109. If the pin 187 is left or right of the raised center
portion, then the pin is aligned with one of the notches 106a or
106b and the actuator 106 may be operated. Simultaneously with this
movement to a non-interfering position of the selector pin 187, the
sear actuator 106 is positioned immediately above that sear
extension 124 or 125 that is selected while the notch in locking
extension 110 or 111 will engage the non-selected sear extension
and lock that sear against pivotal movement. Pivoting of the
trigger 19 therefore results in pivoting of the sear actuator 106,
causing contact of the actuator with the end of the selector sear
and pivoting of the sear from its engaged to its disengaged
position; the non-selected sear remains locked against pivotal
movement, thus preventing discharge of the non-selected barrel such
as by "doubling."
The selector/safe lever 25 is maintained in any of three selected
positions through a spring-loaded ball 202 mounted on the
selector/safe block 181, which ball engages one of three detents
203, 204, or 205 formed in the bottom surface 183 of the receiver
top 50. A release lever 206 is positioned externally of the top 50
of the receiver 12 and extends therethrough and is connected to a
locking cam 208. A pair of barrel locks 210 and 211, in the
embodiment chosen for illustration, are formed of a rectangular
cross section and include tapered faces 212 and 213 respectively. A
cam following surface 215 is positioned relative to the cam 208 so
that rotation of the lever 206 results in the engagement of the cam
208 with the surface 215 and causes the barrel locks 210 and 211 to
move to the right as viewed in the figures. The barrel locks are
urged into an extended position wherein they extend outwardly of
the breech face 71 through the utilization of a barrel lock spring
218 compressed between a shoulder 220 provided in the bottom
surface 183 of the top 50 of the receiver 12 and an opposing recess
221 positioned opposite the camming surface 215. A barrel locking
extension 225 extends rearwardly from the barrel locks 210 and 211
and includes a camming surface 227. Rearward motion of the
extension 225 results in the engagement between the camming surface
227 and a cam following surface 230 provided on the forward surface
of the selector/safe block 181. Therefore, rearward motion of the
barrel lock extension 225 causes the selector/safe block 181 to
assume its central or "safe" position, forcing the selector/safe
carriage 112 to assume a like "safe" position. Thus, upon breaking
the action of the firearm of the present invention, sears in the
engaged position are automatically prevented from being released by
locking the sear actuator.
The breech block 70 includes a pair of L-shaped shoulders 235 and
236 machined therein extending perpendicularly to the breech face
71. When the breech face 70 is inserted in the channels 64 and 65,
the L-shaped shoulders 235 and 236 form rectangular openings
passing through the breech block from the face to the rear thereof.
These openings take a substantially rectangular form, each having
one of the sides and the bottom thereof formed by the L-shaped
shoulders, while the outside side and the top thereof are formed by
one of the side plates 52 or 54 of the receiver 12 and the top
formed by the top 50 of the receiver 12. This rectangular opening
through the breech block permits the utilization of barrel locks
210 and 211 in the form shown. Such a rectangular opening through
the breech would be nearly impossible to machine in prior art
designs. The barrel locks 210 and 211 present slightly tapered
surfaces 212 and 213 so that the locks are readily "cammed" back
into the breech block as the action is closed until the barrel
locks 210 and 211 "snap" into engagement with corresponding detents
240 and 242 provided in the barrel housing 250 (FIG. 12).
Referring now to FIGS. 11 and 12, the barrels 10 and 11 are
attached to barrel housing 250 to which a cocking lever 254 is
slidably secured. The cocking lever engages the cocking arm 88 when
the action is broken, resulting in pivotal movement of the cocking
arm 88 to force the hammers 155 and 156 (not shown in FIGS. 11 and
12) back into their sear-engaging positions. In the embodiment
chosen for illustration, a pair of extractors 260 and 261 are shown
which are slidably positioned alongside the barrel housing 250. The
extractors are urged to their extracted position by engagement
between one of the extractor cams 61 or 62 (FIG. 4) and a cam
contacting surface, such as camming arm 267. It will be obvious to
those skilled in the art that an ejector mechanism may be coupled
with the extraction mechanism above-described utilizing any of
several well-known ejection designs which may incorporate springs,
such as spring 268 engaging extraction rod extension 270.
A forearm 278 incorporating a latch 278 for engaging hook 279 is
provided and includes a fore iron 280 incorporating an
appropriately curved surface 285 for following corresponding curved
surface 287 (FIG. 4) formed in the forward extending side walls 52
and 54. The trunnion lugs 58 and 59 engage arcuate lug receivers
such as receiver 290 formed in the forward portion of the barrel
housing 250. The barrel housing, and thus the barrels, pivot about
the trunnion lugs 58 and 59 which, positioned in the manner
described relative to the insertable breech block 70, provides
accurate positioning of the barrel housing breech face 292 relative
to the breech face 71 without the previously necessary hand-fitting
of the barrel housing 250 and connected barrels 10 and 11 to the
receiver 12.
* * * * *