Adjustable buttstock for firearm

Patent metadata

Field	Value
Publication number	US-2016202016-A1
Application number	US-201614994394-A
Country	US
Kind code	A1
Filing date	Jan 13, 2016
Priority date	Jan 13, 2015
Publication date	Jul 14, 2016
Grant date	—

Abstract

A buttstock includes a mounting extension member attachable to a firearm receiver, an adjustable butt pad for varying the length of the stock, and an adjustable cheek rest for adjusting the height of the stock. The butt pad assembly is attached to the extension member by a laterally compressible clamping member operated by a double-acting cam lever having two locking surfaces and a non-locking release surface. At least one adjustment rail extends forward from the butt pad through opposing movable jaws of the clamping member. The rail can slide forward/rearward to adjust the stock length which is lockable via the cam lever locking surfaces. The cheek rest includes compressible opposing adjustment legs operated by a similarly configured cam lever in one embodiment. The height of the cheek rest may be adjusted and locked in position in a similar manner.

First claim

What is claimed is:

1 . An adjustable buttstock for a firearm, the buttstock comprising:
a longitudinal axis; an elongated stock mounting extension member configured to mount to the firearm; a clamping member disposed on the mounting extension member, the clamping member having downwardly extending and opposing first and second jaws; a butt pad assembly comprising an elongated butt pad and a first adjustment rail protruding axially forward from the butt pad, the first adjustment rail received between the jaws and slidable between a plurality of indexed axial positions for adjusting the length of the buttstock; the jaws of the clamping member laterally movable together and apart between a locked position lockingly engaging the first adjustment rail in one of the axial positions and an unlocked position partially disengaging the first adjustment rail which allows the rail to slide axially relative to the jaws between the axial positions; an opening spring biasing the jaws apart; a double-acting cam lever assembly mechanically coupled to the first and second jaws, the cam lever assembly comprising a cam lever pivotably mounted on the first jaw and including two opposing locking surfaces selectively rotatable into engagement with a bearing surface on the first jaw and a non-locking release surface disposed therebetween; the cam lever pivotably movable from a center release position to one of two opposing locking positions; wherein placing the cam lever in the center release position positions the release surface towards the bearing surface on the first jaw and moves the jaws apart to the unlocked position for adjusting the length of the buttstock; wherein moving the cam lever from the center release position to either of the two locking positions engages one of the locking surfaces with the bearing surface on the first jaw and draws the jaws together to the locked position for fixing the length of the buttstock.

2 . The buttstock according to claim 1 , wherein the locking surfaces are arcuately shaped and the release surface is flat.

3 . The buttstock according to claim 2 , wherein the bearing surface is formed on a washer coupled to the first jaw.

4 . The buttstock according to claim 1 , wherein the cam lever assembly further comprises a transversely movable coupling shaft extending laterally between the first and second jaws, the coupling shaft operably coupling the cam lever to the second jaw for moving the jaws together or apart via pivoting the cam lever.

5 . The buttstock according to claim 4 , wherein the first and second jaws are both molded or cast as an integral unitary structural part of the clamping member.

6 . The buttstock according to claim 5 , wherein the second jaw clamping member includes a non-detachable upper portion and a detachable lower locking piece movably coupled to the upper portion, the locking piece connected to the coupling shaft and movable towards and away from the first jaw independently of the upper portion.

7 . The buttstock according to claim 6 , wherein the locking piece includes a first locking protrusion and the first adjustment rail includes a plurality of longitudinally arranged index grooves, the locking protrusions selectively lockingly engage one of the index grooves on the first adjustment rail when the jaws are in the locked position.

8 . The buttstock according to claim 1 , further comprising a longitudinally-extending stabilizing rod having a front end attachable to the firearm and a rear end coupled to the butt pad assembly.

9 . The buttstock according to claim 1 , wherein the stabilizing rod and mounting extension member are received in complementary configured sockets formed in the clamping member.

10 . The buttstock assembly according to claim 9 , further comprising a threaded cross bolt extending laterally between the first and second jaws, the cross bolt being tightened to apply a compressive clamping force on the mounting extension member and stabilizing rod for securement to the clamping member.

11 . The buttstock according to claim 10 , wherein the cross bolt extends through a transverse hole in the stabilizing rod to lock the stabilizing rod to the clamping member.

12 . The buttstock according to claim 4 , wherein tension in the cam lever assembly is adjusted by rotating a finger nut disposed on an end of the coupling shaft at the second jaw, the finger nut including a plurality of radially extending detents which alternatingly engage a raised rib formed on a washer disposed on the second jaw.

13 . The buttstock according to claim 1 , further comprising:
a cheek rest movably coupled to the upper adjustment rail, the cheek rest adjustable in height with respect to the mounting extension member, the cheek rest including first and second adjustment legs extending downwards from opposing lateral sides of an arcuately curved top of the cheek rest; a pair of vertically extending toothed racks formed on each adjustment leg; a first toothed washer arranged on the first adjustment leg, the first washer comprising a first row of teeth and a second row of teeth engaging the pair of toothed racks on the first adjustment leg; a first spring biasing the first toothed washer outwards for disengaging the toothed racks on the first adjustment leg from the first and second rows of teeth on the first washer; a double-acting second cam lever assembly mechanically coupled to the first and second adjustment legs, the second cam lever assembly comprising a second cam lever mounted on the first adjustment leg, the second cam lever including an elongated operating handle and a cam head comprising two opposing locking surfaces and a non-locking release surface disposed therebetween; the second cam lever pivotably movable from a center release position to one of two opposite locking positions; wherein placing the second cam lever in the center release position disengages the first and second rows of teeth on the first washer from the toothed racks on the first adjustment leg to enable the height of the cheek rest to be adjusted; wherein moving the second cam lever from the center release position to either of the two opposite locking positions engages the first and second rows of teeth on the first washer with the toothed racks on the first adjustment leg to fix the height of the cheek rest.

14 . The buttstock according to claim 13 , wherein the first adjustment rail extends longitudinally between opposing first and second bearing blocks disposed inside the cheek rest, the first bearing block biased into engagement with the first adjustment rail by the first spring, and the second bearing block biased into engagement with the first adjustment rail by a second spring.

15 . The buttstock according to claim 14 , wherein the second cam lever assembly further comprises a transversely movable coupling shaft extending laterally between the first and second adjustment legs, the coupling shaft operably coupling the cam lever to the second adjustment leg for moving the adjustment legs together or apart via pivoting the cam lever.

16 . The buttstock according to claim 15 , wherein tension in the second cam lever assembly is adjusted by rotating a finger nut disposed on an end of the coupling shaft at the second adjustment leg, the finger nut including a plurality of radially extending detents which alternatingly engage a raised rib formed on the second washer.

17 . An adjustable buttstock for a firearm, the buttstock comprising:
a longitudinal axis; an elongated mounting extension member configured to mount to the fi

Assignees

• Sturm Ruger & Co

Inventors

• Mather Jonathan Philip
• Taylor Adam Jay
• Gurney Mark J

Classifications

• F41C23/14 Primary

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