Recoil reduction system for firearm

Patent metadata

Field	Value
Publication number	US-2016010944-A1
Application number	US-201514794949-A
Country	US
Kind code	A1
Filing date	Jul 9, 2015
Priority date	Jul 9, 2014
Publication date	Jan 14, 2016
Grant date	—

Abstract

A user-adjustable recoil reduction system for a firearm includes a buttstock and a butt pad assembly movably mounted to the buttstock. A spring is disposed in the buttstock which is acted on by opposing front and rear spring guides. A preload adjustment screw is rotatably coupled to the butt pad assembly which engages the rear spring guide. Rotating the screw in opposing directions alternatingly advances or retracts the rear spring guide in the buttstock. Advancing the rear spring guide compresses the spring to set a first spring preload condition and retracting the rear spring guide relaxes the spring to set a second spring preload condition different than the first condition. The spring preload conditions may be selected to match firing light or heavy type ammunition shell loads. In one embodiment, the adjustment screw is accessible for adjusting the preload without removing the butt pad assembly from the buttstock.

First claim

What is claimed is:

1 . An adjustable recoil reduction system for a firearm, the system comprising:
an axially extending buttstock having a longitudinal stock axis, a rear end, a front end, and a longitudinally extending internal cavity; a ram including a cantilevered mounting extension, the mounting extension projecting forward from the ram through the rear end of the buttstock into the internal cavity, the mounting extension slideably coupling the ram to the buttstock; a butt pad coupled to the ram; an adjustable plunger assembly comprising a rear spring guide disposed in the buttstock and a preload adjustment screw rotatably coupled to the ram and engaging the rear spring guide, the plunger assembly being movable forward and rearward in the buttstock; and a first compression spring mounted inside the buttstock and engaged by the rear spring guide, the plunger assembly operating to compress the first compression spring when the buttstock moves rearward relative to the plunger assembly; wherein rotating the adjustment screw in a first direction advances the rear spring guide and compresses the first compression spring for setting a first preload condition, and rotating the adjustment screw in an opposite second direction retracts the rear spring guide and allows the first compression spring to expand for setting a second preload condition; wherein when a rearward acting recoil force is generated by discharging the firearm, the buttstock moves rearward and compresses the first compression spring against the plunger assembly to absorb at least a portion of the recoil force.

2 . The system according to claim 1 , wherein the assembly is inserted deeper into the buttstock when the buttstock moves rearward than when the buttstock is in a forward non-recoil position.

3 . The system according to claim 1 , further comprising a tubular spring sleeve disposed inside the buttstock which holds the first compression spring therein, the plunger assembly movably inserted in the spring sleeve.

4 . The system according to claim 3 , wherein a front end of the spring sleeve includes a socket engaged with a cylindrical boss formed in the internal cavity of the buttstock.

5 . The system according to claim 1 , further comprising an elastomeric skirt coupled to the rear end of the buttstock and the ram, the skirt compressing and radially expanding when the buttstock moves rearward.

6 . The system according to claim 1 , further comprising a second compression spring concentrically arranged around the first compression spring, the rear spring guide compressing both the first and second compression springs when the buttstock moves rearward.

7 . The system according to claim 5 , further comprising a front spring guide, the front and rear spring guides each including a first shoulder engaging the first compression spring and a second shoulder engaging the second compression spring.

8 . The system according to claim 1 , wherein the ram includes a plunger mounting protrusion comprising internal threads which rotatably engage the preload adjustment screw.

9 . The system according to claim 1 , further comprising a vertically elongated spacer plate disposed between the butt pad and the ram.

10 . The system according to claim 1 , wherein the butt pad includes a through passage that provides access to the preload adjustment screw without uncoupling the butt pad from the ram.

11 . The system according to claim 1 , wherein the buttstock includes an axially spaced apart pair of longitudinal slots each of which slideably engage a transverse dowel pin extending through the mounting extension of the ram to slideably couple the mounting extension to the buttstock.

12 . An adjustable recoil reduction system for a firearm, the system comprising:
a buttstock extending rearward from a receiver, the buttstock having a longitudinal stock axis, a rear end, a front end, and an internal cavity extending between the front and rear ends; a spring assembly disposed in the buttstock, the spring assembly comprising a tubular sleeve fixedly mounted inside the buttstock, a first spring inside the sleeve, a second spring inside the sleeve concentrically arranged around the first spring, a rear spring guide engaged with the first and second springs, and a front spring guide engaged with the first and second springs; a butt pad assembly comprising a butt pad configured for placement against a shoulder of a user and a ram coupled to butt pad, the butt pad assembly movably coupled to the buttstock; an axially elongated preload adjustment screw threadably coupled to the ram and having a front end engaging the rear spring guide to fix a position of the rear spring guide relative to the sleeve, the preload adjustment screw movable forward and rearward relative to the buttstock by rotating the preload adjustment screw in opposing directions; wherein rotating the preload adjustment screw in a first direction compresses the first and second springs to set a first preload condition, and rotating the preload adjustment screw in an opposite second direction expands the first and second springs to set a second preload condition; wherein when a rearward acting recoil force is generated by discharging the firearm, the buttstock moves rearward and the rear spring guide compresses the first and second springs thereby absorbing at least a portion of the recoil force.

13 . The system according to claim 12 , wherein the first and second springs expand when the recoil force is removed via the buttstock moving forward.

14 . The system according to claim 12 , wherein the butt pad assembly remains stationary against the user's shoulder when the firearm is discharged and the buttstock and spring assembly move rearward.

15 . The system according to claim 12 , wherein the rear spring guide slides forward in the sleeve under the rearward acting recoil force.

16 . The system according to claim 12 , wherein the ram includes a vertically oriented mounting flange having a height substantially coextensive with a height of a front end of the butt pad.

17 . The system according to claim 12 , further comprising a spacer plate interspersed between the butt pad and the ram.

18 . The system according to claim 12 , wherein the buttstock further includes a sidewall and an axially elongated slot disposed in the sidewall, and further comprising a transverse pin mounted inside the buttstock inserted through the slot and connected to a forward projecting mounting extension disposed on the ram, the pin and slot acting to movably couple the butt pad assembly to the buttstock.

19 . The system according to claim 12 , further comprising an elastomeric skirt coupled to the rear end of the buttstock and the ram, the skirt compressing and radially expanding when the buttstock moves rearward.

20 . The system according to claim 12 , further comprising a vertically elongated spacer plate disposed between the butt pad and the ram.

21 . The system according to claim 12 , wherein the ram includes a thrust block which engages a vertically oblong plate attached to the rear end of the buttstock when the buttstock moves rearward under recoil.

22 . A method for reducing recoil in a firearm, the method comprising:
providing a firearm including a buttstock, a butt pad assembly movably coupled to a rear end of the buttstock, a coiled first spring disposed inside the buttstock, and an adjustable plunger mechanism comprising a rear spring guide engaging the c

Assignees

• Sturm Ruger & Co

Inventors

• Downey Matthias
• Boyle Darrell
• Wilkinson Todd
• Barrett Jonathan

Classifications

• F41C23/06

  Stocks {or firearm frames} specially adapted for recoil reduction · CPC title

• F41C23/08 Primary

  Recoil absorbing pads · CPC title

• F41C23/14

  Adjustable stock or stock parts, i.e. adaptable to personal requirements, e.g. length, pitch, cast or drop · CPC title

• F41C23/20

  Butts; Butt plates; Mountings therefor (F41C23/08, F41C23/10, {F41C23/14} take precedence) · CPC title