Adjustable cheek piece for a firearm butt stock

• US 7,810,270 B2
• Filed: 01/11/2008
• Issued: 10/12/2010
• Est. Priority Date: 01/11/2007
• Status: Active Grant

• Current Assignee: Magpul Industries
• Original Assignee: Magpul Industries
• Inventors: Fitzpatrick, Richard, Mayberry, Michael T
• Primary Examiner(s): Johnson; Stephen M
• Assistant Examiner(s): Troy; Daniel J
• Application Number:
  US12/013,226
• Publication Number:
  US 20080236017A1
• Time in Patent Office: 1,005 Days
• Field of Search: 42/710.1, 42/72, 42/73, 42/74
• US Class Current: 42/73
• CPC Class Codes: F41A 21/481 using partial or interrupted threads, e.g. bayonet-type mountings

Abstract

A firearm butt stock with an adjustable cheek piece comprises an elongate stock base having a top, a bottom, a right side, a left side, a proximal end and a distal end. The stock base has a transverse pivot shaft near the stock base top and a transverse catch shaft spaced from the pivot shaft lengthwise of the stock base near the stock base top. A cheek piece has a proximal end and a distal end and a left and a right sidewall. The cheek piece defines a plurality of lengthwise stacked receptacles opening toward a proximal end of the cheek piece and an elongate hole having a distal and a proximal end spaced lengthwise and distal of the stacked receptacles. The stacked receptacles, the catch shaft, the elongate hole and the pivot shaft are configured so that with the pivot shaft received in the elongate hole and the pivot shaft at the distal end of the elongate hole, the catch shaft is received in one of the stacked receptacles and the cheek piece is prevented from pivoting about the pivot shaft. With the pivot shaft at the proximal end of the elongate hole, the catch shaft clears the opening of the stacked receptacles and the cheek piece can pivot about the pivot shaft. A spring detent is provided in operative association with one of the pivot shaft and the catch shaft. The spring detent prevents relative movement of the pivot shaft and the proximal and distal ends of the elongate hole without application of a lengthwise force to the cheek piece in a desired lengthwise direction of movement sufficient to overcome the spring detent.

Claims

1. A firearm butt stock comprising:

an elongate stock base having a top, a bottom, a right side, a left side, a proximal end and a distal end, the stock base having a transverse pivot shaft near the stock base top and a transverse catch shaft spaced from the pivot shaft lengthwise of the stock near the stock base top;

a cheek piece having a proximal end a distal end and left and right sidewalls, the cheek piece defining a plurality of lengthwise stacked receptacles opening toward a proximal end of the cheek piece and an elongate hole having a distal and a proximal end spaced lengthwise and distal of the stacked receptacles, the stacked receptacles, the catch shaft, the elongate hole and the pivot shaft being configured so that with the pivot shaft received in the elongate hole and the pivot shaft at the distal end of the elongate hole, the catch shaft is received in one of the stacked receptacles and the cheek piece is prevented from pivoting about the pivot shaft and with the pivot shaft at the proximal end of the elongate hole, the catch shaft clears the opening of the stacked receptacles and the cheek piece can pivot about the pivot shaft; and

a spring detent operatively associated with one of the pivot shaft and the catch shaft, the spring detent preventing relative movement between the pivot shaft and the proximal and distal ends of the elongate hole without application of a lengthwise force to the cheek piece in a desired lengthwise direction of movement sufficient to overcome the spring detent.

2. The firearm butt stock of claim 1 wherein the spring detent comprises the elongate hole being peanut-shaped with a proximal lobe and a distal lobe separated by waist, the waist having a width less than a diameter of the pivot shaft, and at least one of the cheek piece and the pivot shaft being formed of a resilient material.

3. The firearm butt stock of claim 2 further comprising the cheek piece having a pair of the peanut-shaped holes axially aligned in the left and right sidewalls and the elongate base having a pair of the pivot shafts axially aligned and extending from the right side and the left side of the stock base near the stock base top, the left and right pivot shafts being received in the left and right peanut-shaped holes respectively.

4. The firearm butt stock of claim 3 further comprising the cheek piece side walls defining opposing lengthwise slots forming the plurality of lengthwise stacked receptacles and the elongate base has a pair of the catch shafts axially aligned and extending from the right side and the left side of the stock base near the stock base top receivable in the lengthwise stacked receptacles.

5. The firearm butt stock of claim 2 wherein the cheek piece and the pivot shafts are formed of the same resilient material.

6. The firearm butt stock of claim 2 wherein the cheek piece is integrally formed of a resilient polymer.

7. The firearm butt stock of claim 6 wherein the elongate stock base is integrally formed from the resilient polymer.

8. The firearm butt stock of claim 1 further comprising the cheek piece side walls defining opposing lengthwise slots in an inner surface forming the plurality of lengthwise stacked receptacles and the elongate base has a pair of the catch shafts axially aligned and extending from the right side and the left side of the stock base near the stock base top receivable in the lengthwise stacked receptacles.

9. The firearm butt stock of claim 1 further comprising the plurality of lengthwise stacked receptacles being two.

10. The firearm butt stock of claim 1 wherein the cheek piece and the pivot shafts are formed of the same resilient material.

11. The firearm butt stock of claim 1 wherein the cheek piece is integrally formed of a resilient polymer.

12. A firearm comprising:

an upper receiver;

a grip housing;

a barrel; and

a butt stock, the butt stock comprising;

an elongate stock base having a top, a bottom, a right side, a left side, a proximal end and a distal end, the stock base having a transverse pivot shaft near the stock base top and a transverse catch shaft spaced from the pivot shaft lengthwise of the stock near the stock base top;

a cheek piece having a proximal end, a distal end and left and right sidewalls, the cheek piece defining a plurality of lengthwise stacked receptacles opening toward a proximal end of the cheek piece between the sidewalls and an elongate hole having a distal and a proximal end spaced lengthwise and distal of the stacked receptacles, the stacked receptacles, the catch shaft, the elongate hole and the pivot shaft being configured so that with the pivot shaft received in the elongate hole and the pivot shaft at the distal end of the elongate hole, the catch shaft is received in one of the stacked receptacles and the cheek piece is prevented from pivoting about the pivot shaft and with the pivot shaft at the proximal end of the elongate hole, the catch shaft clears the opening of the stacked receptacles and the cheek piece can pivot about the pivot shaft; and

a spring detent operatively associated with one of the pivot shaft and the catch shaft, the spring detent preventing movement of the pivot shaft between the proximal and distal ends of the elongate hole without application of a lengthwise force to the cheek piece in a desired lengthwise direction of movement sufficient to overcome the spring detent.

13. The firearm of claim 12 wherein the spring detent comprises the elongate hole being peanut-shaped with a proximal lobe and a distal lobe separated by waist, the waist having a width less than a diameter of the pivot shaft, and at least one of the cheek piece and the pivot shaft being formed of a resilient material.

14. The firearm of claim 13 further comprising the cheek piece having a pair of the peanut-shaped holes axially aligned in the left and right sidewalls and the elongate base having a pair of the pivot shafts axially aligned and extending from the right side and the left side of the stock base near the stock base top, the left and right pivot shafts being received in the left and right peanut-shaped holes respectively.

15. The firearm of claim 14 further comprising the cheek piece side walls defining opposing lengthwise slots forming the plurality of lengthwise stacked receptacles and the elongate base has a pair of the catch shafts axially aligned and extending from the right side and the left side of the stock base near the stock base top receivable in the lengthwise stacked receptacles.

16. The firearm of claim 12 further comprising the cheek piece side walls defining opposing lengthwise slots forming the plurality of lengthwise stacked receptacles and the elongate base has a pair of the catch shafts axially aligned and extending from the right side and the left side of the stock base near the stock base top receivable in the lengthwise stacked receptacles.

17. The firearm butt stock of claim 16 wherein the elongate stock base is integrally formed from the resilient polymer.