ADJUSTABLE BUTTSTOCK CLAMP

• US 20150338186A1
• Filed: 05/20/2015
• Published: 11/26/2015
• Est. Priority Date: 05/20/2014
• Status: Active Grant

• Current Assignee: Sig Sauer Incorporated (SIG Sauer US Holding LP)
• Original Assignee: Sig Sauer Incorporated (SIG Sauer US Holding LP)
• Inventors: Hopkins, David B.
• Granted Patent: US 9,360,272 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F41C 23/04 Folding or telescopic stocks or stock parts articulated or collapsible guns F41A11/04
• CPC Class Codes: F41C 23/08 Recoil absorbing pads
• CPC Class Codes: F41C 23/14 Adjustable stock or stock parts, i.e. adaptable to personal requirements, e.g. length, pitch, cast or drop
• CPC Class Codes: F41C 23/20 Butts; Butt plates; Mountings therefor F41C23/08, F41C23/10, F41C23/14 take precedence

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.

Claims

1. An adjustable buttstock clamp comprising:

a band clamp with at least two end portions;

a cam lever configured to be operatively coupled to the at least two end portions and to pivot around a cam axle, wherein a camming surface of the cam lever is configured to apply a clamping force on the at least two end portions when in a locked position; and

a locking feature extending from the cam lever in a direction perpendicular to the cam axle, wherein a portion of the locking feature is configured to pass within an inner area of the band clamp when the cam lever is in the locked position.

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 cam lever 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 clamp 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 clamp of claim 2, wherein dimensions of the locking feature are complementary to at least one of width and depth of the plurality of grooves.

5. The adjustable buttstock clamp 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 cam lever is in the locked position.

6. The adjustable buttstock clamp of claim 2, wherein the locking feature is configured to engage with one of the plurality of grooves before the 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.

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

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

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

10. The adjustable buttstock clamp of claim 9, wherein the band clamp 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 clamp.

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

12. 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.

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

14. The cam lever of claim 13, 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.

15. The cam lever of claim 13, wherein dimensions of the locking feature are determined based on at least one of width and depth of the groove of the grooved extension shaft.

16. 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 and configured to apply a clamping force on the at least two end portions when the cam lever is in a locked position; and

a locking feature extending from the cam lever in a direction perpendicular to a 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.

17. The adjustable length rifle buttstock of claim 16, 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 cam lever is in the locked position.

18. The adjustable length rifle buttstock of claim 17, wherein a handle portion of the cam lever conforms to the outer surface of the buttstock body when the cam lever is in the locked position.

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

20. A firearm including the adjustable length rifle buttstock of claim 17, 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 cam lever in the locked position when the buttstock extension shaft is in a desired location.