Adjustable buttstock clamp

Patent metadata

Field	Value
Publication number	US-9360272-B2
Application number	US-201514717036-A
Country	US
Kind code	B2
Filing date	May 20, 2015
Priority date	May 20, 2014
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

An adjustable buttstock clamp for a rifle is disclosed which includes a cam lever having a mechanical locking feature configured to engage with a groove in a buttstock extension shaft when in the locked position. A buttstock recoil pad may be attached to an extension shaft that can telescope in and out of the body of the buttstock, allowing the user to adjust the length of pull of the rifle and angle of the recoil pad. In one embodiment, the shaft includes a number of grooves on its surface along the length of the shaft and the shaft is held in place using a band clamp that is activated by the cam lever. When the cam lever is in the locked position, the locking feature engages with one of the grooves of the shaft to hold the buttstock recoil pad at the desired length and angle.

First claim

What is claimed is:

1. An adjustable buttstock damp comprising:
a band damp with at least two end portions;
a cam lever configured to be operatively coupled to the at least two end portions, the cam lever comprising:
an eccentric camming portion configured to pivot around a cam axis; an eccentric camming surface on the eccentric camming portion configured to apply a clamping force on the least two end portions when in a locked position;
a cam lever handle extending from the eccentric camming portion; and a locking feature extending from the eccentric camming portion in a direction perpendicular to the cam axle axis, wherein a portion of the locking feature is configured to pass within an inner area of the band clamp when the eccentric camming portion is in the locked position, wherein dimensions of the locking feature are complementary to at least one of width and depth of a plurality of grooves of a buttstock shaft.

2. The adjustable buttstock clamp of claim 1 , wherein the band clamp is configured to receive a grooved extension shaft having an outer surface contoured to define a plurality of grooves at different points along a length of the grooved extension shaft, and wherein the locking feature is configured to engage with one of the plurality of grooves when the eccentric camming portion is in the locked position.

3. The adjustable buttstock clamp of claim 2 , further comprising a leaf spring operatively coupled to the band clamp, wherein an outer surface of the band clamp is contoured to define a slot accessing an inner circumference of the band damp and a portion of the leaf spring is configured to pass through the slot and within the inner circumference of the band clamp and to engage with one of the plurality of grooves.

4. The adjustable buttstock damp of claim 2 , wherein the locking feature is further configured to apply a camming force against a portion of the grooved extension shaft when the eccentric camming portion is in the locked position.

5. The adjustable buttstock damp of claim 2 , wherein the locking feature is configured to engage with one of the plurality of grooves before the eccentric camming surface of the cam lever applies a significant clamping force on the at least two end portions, allowing the extension shaft to rotate around its axis while preventing the extension shaft from sliding along its axis.

6. The adjustable buttstock clamp of claim 2 , further comprising the grooved extension shaft.

7. The adjustable buttstock clamp of claim 6 , wherein a buttstock recoil pad is attached to a flange portion located at one end of the grooved extension shaft.

8. The adjustable buttstock clamp of claim 7 , further comprising a boss feature located at an end of the grooved extension shaft opposite the flange portion.

9. The adjustable buttstock clamp of claim 8 , wherein the band damp is configured to be mounted within a cavity of a rifle buttstock, and the grooved extension shaft is configured to telescope in and out of the rifle buttstock through the band damp.

10. A firearm including the adjustable buttstock clamp of claim 1 .

11. A cam lever comprising:
an eccentric camming portion configured to pivot around a cam axis;
an eccentric camming surface on the eccentric camming portion configured to apply a clamping force on end portions of a band clamp when the eccentric camming portion is in a locked position;
a cam lever handle extending from the eccentric camming portion; and
a locking feature extending from the eccentric camming portion perpendicular to the cam axis, and wherein a portion of the locking feature is configured to pass within an inner circumference of the band clamp when the eccentric camming portion is in a locked position, wherein dimensions of the locking feature are determined based on at least one of width and depth of a groove of a grooved extension shaft of a buttstock shaft.

12. The cam lever of claim 11 , wherein the locking feature is configured to engage with a groove of a grooved shaft passing through the band damp when the eccentric camming portion is in the locked position.

13. The cam lever of claim 12 , wherein the grooved shaft is a buttstock extension shaft configured to adjust at least one of a rifle's length of pull and a recoil pad angle of orientation.

14. An adjustable length rifle buttstock comprising:
a band clamp having at least two end portions;
a buttstock body having an outer surface defining a cavity for receiving the band clamp; a buttstock extension shaft having a plurality of grooves around its circumference at different points along its length and defining a plurality of ridges between the plurality of grooves, wherein the extension shaft is configured to telescope in and out of the cavity through the band clamp; a buttstock recoil pad attached to one end of the buttstock extension shaft;
a cam lever operatively coupled to the at least two end portions, the cam lever comprising:
an eccentric camming portion configured to pivot around a cam axis; an eccentric camming surface on the eccentric ramming portion configured to apply a clamping force on the at least two end portions when the earn eccentric camming portion is in a locked position;
a cam lever handle extending from the eccentric camming portion; and a locking feature extending from the eccentric camming portion in a direction perpendicular to the cam axis, wherein a portion of the locking feature extends into one of the plurality of grooves when in the locked position and remains clear of the plurality of ridges when in an unlocked position.

15. The adjustable length rifle buttstock of claim 14 , wherein the outer surface of the buttstock body is contoured to define a cam lever groove for receiving a handle portion of the cam lever when the eccentric camming portion is in the locked position.

16. The adjustable length rifle buttstock of claim 15 , wherein a handle portion of the cam lever conforms to the outer surface of the buttstock body when the eccentric camming portion is in the locked position.

17. A firearm including the adjustable length rifle buttstock of claim 15 .

18. A firearm including the adjustable length rifle buttstock of claim 15 , wherein a user can adjust at least one of the length of pull of the firearm and the buttstock recoil pad's angle of orientation by placing the eccentric camming portion in the locked position when the buttstock extension shaft is in a desired location.

Assignees

• Sig Sauer Inc

Inventors

• Hopkins David B

Classifications

• F41C23/14 Primary

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

• F41C23/08

  Recoil absorbing pads · CPC title

• F41C23/20

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

• F41C23/04

  Folding or telescopic stocks or stock parts (articulated or collapsible guns F41A11/04) · CPC title