US3869961A - Action spring assembly for forwardly urging the action bar of shotguns - Google Patents

Action spring assembly for forwardly urging the action bar of shotguns Download PDF

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Publication number
US3869961A
US3869961A US342599A US34259973A US3869961A US 3869961 A US3869961 A US 3869961A US 342599 A US342599 A US 342599A US 34259973 A US34259973 A US 34259973A US 3869961 A US3869961 A US 3869961A
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action
spring assembly
spring
coil springs
ring
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US342599A
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Takeji Kawamura
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A5/00—Mechanisms or systems operated by propellant charge energy for automatically opening the lock
    • F41A5/18—Mechanisms or systems operated by propellant charge energy for automatically opening the lock gas-operated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A3/00—Breech mechanisms, e.g. locks
    • F41A3/64—Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
    • F41A3/78—Bolt buffer or recuperator means
    • F41A3/82—Coil spring buffers
    • F41A3/86—Coil spring buffers mounted under or above the barrel

Definitions

  • a shotgun includes an action spring assembly forwardly urging the action bar.
  • the action spring assembly has a pair of coil springs arranged in a row and a shock absorbing member interposed between the coil springs.
  • the shock absorbing member is constructed by two rings so assembled that they may buffer the force applied to one spring and transmit the buffered force to the other spring when the action bar is returned to its orginal position.
  • a conventional shotgun or fire arm is provided with an action bar which is rearwards moved through a piston with propellant gases generated upon firing of the shotgun so as to bring the shotgun to a waiting condition.
  • the action bar is then returned to its original position by a coil spring when the pressure of propellant gases is decreased.
  • the returning of the action bar by the coil spring heretofore has been accompanied with a great shock force and sound.
  • an object of the present invention is to provide an action spring assembly which may return the action bar of the shotgun without a great shock force and sound.
  • FIG. 1 is a perspective view of a shotgun including an action spring assembly according to an embodiment of the present invention
  • FIG. 2 is a sectional view of the part of the shotgun shown in FIG. l;
  • FIG. 3 is an enlarged sectional view of the buffer member of the spring assembly.
  • FIG. 4 is a perspective expanded view of a pair of rings of the buffer member.
  • a shotgun body l is ofa conventional configuration having a barrel 2, receiver 3, and butt 4. From the receiver 3 there is extended a magazine tube 5 on which an action bar 6 is provided as shown in FIG. 2.
  • the action bar 6 includes a short cylindrical section or forward part 7a slidably mounted around the magazine tube 5 and a pair of parallel bars or rearward parts 7b with one end fixed to the rear upper part of the cylinder 7a and the other end connected to a sliding member as described later.
  • the front end of the cylinder 7a is securely connected to the rear end of a piston 8 slidably received in a cylinder 10, so that the action bar may be moved with the piston.
  • the piston 8 may be moved, rearwards or in a direction of an arrow A, against an action spring assembly 11 with propellant gases which have been generated in the barrel 2 at firing of the shotgun and then introduced into the cylinder 10 through an inclined passage 9 formed in the wall of the barrel.
  • the action spring assembly 11 is mounted around the periphery of the magazine tube, which comprises apair of coil springs 12 and 13 having substantially the same length and diameter, and a buffer member 14 interposed between the coil springs and contacted with them.
  • the forward end of one coil spring 12 abuts on the rear end of the short cylindrical section 7a and the rear end of the other coil spring 13 is fixed to the flange 5a, so that the action bar 6 is usually urged in a forward direction of an arrow B by the spring assembly.
  • the buffer member 14 is constructed of a pair of metal rings 15 and 16 with the same diameter.
  • One ring 15 is formed with a transverse cut 15a in the part of its periphery thereby to elastically expand to have its diameter broadened.
  • At one end portion of the ring 15 there is formed an inclined inner surface 15b.
  • the other ring 16 has at the end portion an outer surface 16b inclined at the same angle as the inclined surface of said one ring 15 so that both inclined surfaces 15b and 16b may be slidably contacted with each other.
  • the rear end of the action bar is connected to the sliding member 17 which is received in the under part ofa bolt 19 slidably mounted in a charging room 18 expanded from the base of the barrel 2 to the receiver 3.
  • the sliding member 17 may be slid within a certain range in the bolt 19.
  • the bolt 19 may cooperate with the action bar 6 through the sliding member 17 and slid to a direction of an arrow C with propellant gases at firing of the shotgun.
  • the buffer member of the spring assembly may buffer the force applied to one coil spring and to transmit the buffered force to the other coil spring, so that the shock force and sound are effectively decreased.
  • a spring assembly returning an action bar to its original position which has been moved in one direction by a piston
  • the improvement comprising a pair of coil springs arranged in a row and a shock absorbing member interposed between said coil springs to buffer the force applied to one spring and to transmit the buffered force to the other spring, said shock absorbing member having first and second rings arranged coaxially with the coil springs and contacted with each other, the first ring being able to be resiliently expanded in a radial direction when being pressed by the second ring.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Springs (AREA)
  • Vibration Dampers (AREA)

Abstract

A shotgun includes an action spring assembly forwardly urging the action bar. The action spring assembly has a pair of coil springs arranged in a row and a shock absorbing member interposed between the coil springs. The shock absorbing member is constructed by two rings so assembled that they may buffer the force applied to one spring and transmit the buffered force to the other spring when the action bar is returned to its orginal position.

Description

Elnite Sttes Kawamura ACTION SPRING ASSEMBLY FOR FORWARDLY URGING THE ACTION BAR 0F SHOTGUNS llakeji Kawamura, 1388-1 Akahane, lshinazaka-cho, lHitachi-shi, Ibaragi-ken, Japan Filed: Mar. 19, 1973 Appl No: 342,599
inventor:
U.S. Cl. 89/191 A, 89/198 Int. Cl. F41d 5/04 Field of Search 89/191 R, 191 A, 192, 193,
References Cited UNITED STATES PATENTS Clair 89/192 [451 Mar. 11, 1M5
1,066,206 7/1913 Jolidon 89/190 2,451,624 10/1948 Loomis et al............ 89/191 3,306,168 2/1967 Blumrick 89/190 Primary ExaminerStephen C. Bentley Attorney, Agent, or Firm-Thompson, Birch, Gauthier & Samuels [57] ABSTRACT A shotgun includes an action spring assembly forwardly urging the action bar. The action spring assembly has a pair of coil springs arranged in a row and a shock absorbing member interposed between the coil springs. The shock absorbing member is constructed by two rings so assembled that they may buffer the force applied to one spring and transmit the buffered force to the other spring when the action bar is returned to its orginal position.
3 Claims, 4 Drawing Figures ACTION SPRING ASSEMBLY FOR FORWARDLY URGING THE ACTION BAR OF SHOTGUNS BACKGROUND OF THE INVENTION This invention relates to a shotgun and more particularly to an improvement of an action spring assembly of an action bar used in the shotgun.
A conventional shotgun or fire arm is provided with an action bar which is rearwards moved through a piston with propellant gases generated upon firing of the shotgun so as to bring the shotgun to a waiting condition. The action bar is then returned to its original position by a coil spring when the pressure of propellant gases is decreased. The returning of the action bar by the coil spring heretofore has been accompanied with a great shock force and sound.
SUMMARY OF THE INVENTION Accordingly. an object of the present invention is to provide an action spring assembly which may return the action bar of the shotgun without a great shock force and sound.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a perspective view of a shotgun including an action spring assembly according to an embodiment of the present invention;
FIG. 2 is a sectional view of the part of the shotgun shown in FIG. l;
FIG. 3 is an enlarged sectional view of the buffer member of the spring assembly; and
FIG. 4 is a perspective expanded view of a pair of rings of the buffer member.
DETAILED DESCRIPTION OF THE INVENTION There will now be described one embodiment of the present invention with reference to the accompanying drawings.
As shown in FIG. 1, a shotgun body l is ofa conventional configuration having a barrel 2, receiver 3, and butt 4. From the receiver 3 there is extended a magazine tube 5 on which an action bar 6 is provided as shown in FIG. 2. The action bar 6 includes a short cylindrical section or forward part 7a slidably mounted around the magazine tube 5 and a pair of parallel bars or rearward parts 7b with one end fixed to the rear upper part of the cylinder 7a and the other end connected to a sliding member as described later. The front end of the cylinder 7a is securely connected to the rear end of a piston 8 slidably received in a cylinder 10, so that the action bar may be moved with the piston. The piston 8 may be moved, rearwards or in a direction of an arrow A, against an action spring assembly 11 with propellant gases which have been generated in the barrel 2 at firing of the shotgun and then introduced into the cylinder 10 through an inclined passage 9 formed in the wall of the barrel.
The action spring assembly 11 is mounted around the periphery of the magazine tube, which comprises apair of coil springs 12 and 13 having substantially the same length and diameter, and a buffer member 14 interposed between the coil springs and contacted with them. The forward end of one coil spring 12 abuts on the rear end of the short cylindrical section 7a and the rear end of the other coil spring 13 is fixed to the flange 5a, so that the action bar 6 is usually urged in a forward direction of an arrow B by the spring assembly.
The buffer member 14 is constructed of a pair of metal rings 15 and 16 with the same diameter. One ring 15 is formed with a transverse cut 15a in the part of its periphery thereby to elastically expand to have its diameter broadened. At one end portion of the ring 15 there is formed an inclined inner surface 15b. The other ring 16 has at the end portion an outer surface 16b inclined at the same angle as the inclined surface of said one ring 15 so that both inclined surfaces 15b and 16b may be slidably contacted with each other.
The rear end of the action bar is connected to the sliding member 17 which is received in the under part ofa bolt 19 slidably mounted in a charging room 18 expanded from the base of the barrel 2 to the receiver 3. As a conventional manner, the sliding member 17 may be slid within a certain range in the bolt 19. The bolt 19 may cooperate with the action bar 6 through the sliding member 17 and slid to a direction of an arrow C with propellant gases at firing of the shotgun.
With the spring assembly constructed as described above, when the action bar which has been slid in a direction ofan arrow A is moved in a direction of an arrow B to return its original position, the buffer member of the spring assembly may buffer the force applied to one coil spring and to transmit the buffered force to the other coil spring, so that the shock force and sound are effectively decreased.
What is claimed is:
1. In a spring assembly returning an action bar to its original position which has been moved in one direction by a piston, the improvement comprising a pair of coil springs arranged in a row and a shock absorbing member interposed between said coil springs to buffer the force applied to one spring and to transmit the buffered force to the other spring, said shock absorbing member having first and second rings arranged coaxially with the coil springs and contacted with each other, the first ring being able to be resiliently expanded in a radial direction when being pressed by the second ring.
2. The spring assembly according to claim 1 wherein the first ring has a traverse cut.
3. The spring assembly according to claim 2 wherein the inner surface of the first ring has a portion inclined at an angle on one side and the outer surface of the second ring has a portion inclined at the same angle as the inclined portion of the first ring to contact with the same.

Claims (3)

1. In a spring assembly returning an action bar to its original position which has been moved in one direction by a piston, the improvement comprising a pair of coil springs arranged in a row and a shock absorbing member interposed between said coil springs to buffer the force applied to one spring and to transmit the buffered force to the other spring, said shock absorbing member having first and second rings arranged coaxially with the coil springs and contacted with each other, the first ring being able to be resiliently expanded in a radial direction when being pressed by the second ring.
1. In a spring assembly returning an action bar to its original position which has been moved in one direction by a piston, the improvement comprising a pair of coil springs arranged in a row and a shock absorbing member interposed between said coil springs to buffer the force applied to one spring and to transmit the buffered force to the other spring, said shock absorbing member having first and second rings arranged coaxially with the coil springs and contacted with each other, the first ring being able to be resiliently expanded in a radial direction when being pressed by the second ring.
2. The spring assembly according to claim 1 wherein the first ring has a traverse cut.
US342599A 1973-03-19 1973-03-19 Action spring assembly for forwardly urging the action bar of shotguns Expired - Lifetime US3869961A (en)

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Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4244273A (en) * 1978-12-04 1981-01-13 Langendorfer Plastics Corporation Rifle modification
FR2495759A1 (en) * 1980-12-09 1982-06-11 Mauser Werke Oberndorf CYLINDER HEAD FOR AUTOMATIC WEAPONS
US4389920A (en) * 1981-02-20 1983-06-28 Dufour Sr Joseph H Semiautomatic firearm
US5076139A (en) * 1990-08-29 1991-12-31 Hiett Charles A Buffer for firearms
US20060027091A1 (en) * 2004-07-23 2006-02-09 Andres Ratti Reciprocating barrel firearm apparatus
EA007440B1 (en) * 2005-09-27 2006-10-27 Петр Николаевич Черкашин Automatic device for shooting weapon of light, average and heavy calibre
US20070227133A1 (en) * 2006-03-31 2007-10-04 Caterpillar Inc. Cylinder With Internal Pushrod
US20080276797A1 (en) * 2006-07-24 2008-11-13 Paul Leitner-Wise Self-cleaning gas operating system for a firearm
US20100024636A1 (en) * 2008-07-29 2010-02-04 Winge Michael L Gas pressure mechanism in gas-operated firearm
US8176837B1 (en) 2009-10-11 2012-05-15 Jason Stewart Jackson Firearm operating rod
US20130036900A1 (en) * 2011-08-08 2013-02-14 Stephen Mark Mueller Recoil Apparatus for Firearm
US8640598B1 (en) 2010-07-19 2014-02-04 Jason Stewart Jackson Sleeve piston for actuating a firearm bolt carrier
US20150226503A1 (en) * 2012-08-06 2015-08-13 Ata Silah San. A.S. Novel operating system in the semi-automatic firearms
US9261314B1 (en) 2010-07-19 2016-02-16 Jason Stewart Jackson Sleeve piston for actuating a firearm bolt carrier
US9506711B2 (en) 2012-07-31 2016-11-29 Lwrc International Llc Barrel nut assembly and method to attach a barrel to a firearm using such assembly
US9506702B2 (en) 2014-01-10 2016-11-29 Jv Precision Machine Company Externally loading semi-automatic firearm with integral or non-removable feeding device
US9625232B2 (en) 2013-03-15 2017-04-18 Lwrc International Llc Firearm buffer system and buttstock assembly
US9658011B2 (en) 2011-08-17 2017-05-23 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US9772150B2 (en) 2012-07-31 2017-09-26 Lwrc International Llc Firearm receiver assembly
US9810495B2 (en) 2011-08-17 2017-11-07 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US9816546B2 (en) 2012-07-31 2017-11-14 Lwrc International Llc Barrel nut assembly and method to attach a barrel to a firearm using such assembly
WO2017204768A1 (en) * 2016-05-23 2017-11-30 Ultron Savunma Sanayi Ve Ticaret A. S. Rifle mechanism

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US483539A (en) * 1892-10-04 claie
US1066206A (en) * 1909-07-06 1913-07-01 Charles J Jolidon Magazine-firearm.
US2451624A (en) * 1947-08-27 1948-10-19 Remington Arms Co Inc Inertia rate of fire retarders
US3306168A (en) * 1965-08-16 1967-02-28 Howard J Blumrick Gas operated semi-automatic pistol

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US483539A (en) * 1892-10-04 claie
US1066206A (en) * 1909-07-06 1913-07-01 Charles J Jolidon Magazine-firearm.
US2451624A (en) * 1947-08-27 1948-10-19 Remington Arms Co Inc Inertia rate of fire retarders
US3306168A (en) * 1965-08-16 1967-02-28 Howard J Blumrick Gas operated semi-automatic pistol

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4244273A (en) * 1978-12-04 1981-01-13 Langendorfer Plastics Corporation Rifle modification
FR2495759A1 (en) * 1980-12-09 1982-06-11 Mauser Werke Oberndorf CYLINDER HEAD FOR AUTOMATIC WEAPONS
US4389920A (en) * 1981-02-20 1983-06-28 Dufour Sr Joseph H Semiautomatic firearm
US5076139A (en) * 1990-08-29 1991-12-31 Hiett Charles A Buffer for firearms
US20060027091A1 (en) * 2004-07-23 2006-02-09 Andres Ratti Reciprocating barrel firearm apparatus
US7231864B2 (en) 2004-07-23 2007-06-19 Andres Ratti Reciprocating barrel firearm apparatus
EA007440B1 (en) * 2005-09-27 2006-10-27 Петр Николаевич Черкашин Automatic device for shooting weapon of light, average and heavy calibre
US20070227133A1 (en) * 2006-03-31 2007-10-04 Caterpillar Inc. Cylinder With Internal Pushrod
US20080276797A1 (en) * 2006-07-24 2008-11-13 Paul Leitner-Wise Self-cleaning gas operating system for a firearm
US7461581B2 (en) * 2006-07-24 2008-12-09 Lwrcinternational, Llc Self-cleaning gas operating system for a firearm
US20100024636A1 (en) * 2008-07-29 2010-02-04 Winge Michael L Gas pressure mechanism in gas-operated firearm
US8245625B2 (en) * 2008-07-29 2012-08-21 Winge Michael L Gas pressure mechanism in gas-operated firearm
US8176837B1 (en) 2009-10-11 2012-05-15 Jason Stewart Jackson Firearm operating rod
US8640598B1 (en) 2010-07-19 2014-02-04 Jason Stewart Jackson Sleeve piston for actuating a firearm bolt carrier
US9261314B1 (en) 2010-07-19 2016-02-16 Jason Stewart Jackson Sleeve piston for actuating a firearm bolt carrier
US20130036900A1 (en) * 2011-08-08 2013-02-14 Stephen Mark Mueller Recoil Apparatus for Firearm
US8844425B2 (en) * 2011-08-08 2014-09-30 Elite Tactical Advantage Recoil apparatus for firearm
US9810495B2 (en) 2011-08-17 2017-11-07 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US11662169B2 (en) 2011-08-17 2023-05-30 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US11828560B2 (en) 2011-08-17 2023-11-28 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US10598452B2 (en) 2011-08-17 2020-03-24 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US11493292B2 (en) 2011-08-17 2022-11-08 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US9658011B2 (en) 2011-08-17 2017-05-23 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US10309739B2 (en) 2011-08-17 2019-06-04 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US11067352B2 (en) 2011-08-17 2021-07-20 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US9816546B2 (en) 2012-07-31 2017-11-14 Lwrc International Llc Barrel nut assembly and method to attach a barrel to a firearm using such assembly
US9506711B2 (en) 2012-07-31 2016-11-29 Lwrc International Llc Barrel nut assembly and method to attach a barrel to a firearm using such assembly
US11530892B2 (en) 2012-07-31 2022-12-20 Lwrc International Llc Barrel nut assembly and method to attach a barrel to a firearm using such assembly
US10240883B2 (en) 2012-07-31 2019-03-26 Lwrc International Llc Firearm receiver assembly
US9772150B2 (en) 2012-07-31 2017-09-26 Lwrc International Llc Firearm receiver assembly
US11686548B2 (en) 2012-07-31 2023-06-27 Lwrc International Llc Firearm receiver assembly
US11898589B2 (en) 2012-07-31 2024-02-13 Lwrc International Llc Barrel nut assembly and method to attach a barrel to a firearm using such assembly
US10697726B2 (en) 2012-07-31 2020-06-30 Lwrc International Llc Barrel nut assembly and method to attach a barrel to a firearm using such assembly
US10808748B2 (en) 2012-07-31 2020-10-20 Lwrc International Llc Barrel nut assembly and method to attach a barrel to a firearm using such assembly
US10895430B2 (en) 2012-07-31 2021-01-19 Lwrc International Llc Firearm receiver assembly
US9546833B2 (en) * 2012-08-06 2017-01-17 Ata Silah San. A.S. Operating system in the semi-automatic firearms
US20150226503A1 (en) * 2012-08-06 2015-08-13 Ata Silah San. A.S. Novel operating system in the semi-automatic firearms
US11460265B2 (en) 2013-03-15 2022-10-04 Lwrc International Llc Firearm buffer system and buttstock assembly
US10591245B2 (en) 2013-03-15 2020-03-17 Lwrc International Llc Firearm buffer system and buttstock assembly
US9915497B2 (en) 2013-03-15 2018-03-13 Lwrc International Llc Firearm buffer system and buttstock assembly
US9625232B2 (en) 2013-03-15 2017-04-18 Lwrc International Llc Firearm buffer system and buttstock assembly
US9506702B2 (en) 2014-01-10 2016-11-29 Jv Precision Machine Company Externally loading semi-automatic firearm with integral or non-removable feeding device
WO2017204768A1 (en) * 2016-05-23 2017-11-30 Ultron Savunma Sanayi Ve Ticaret A. S. Rifle mechanism

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