# US 8,333,141 B2 · Recoil absorbing assembly for automatic weapons

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- Number: US 8,333,141 B2
- Document ID: US8333141B2
- Status: Granted
- Kind: B2
- Application number: 12/711,573
- Filed: 2010-02-24
- Published: 2011-08-25
- Granted: 2012-12-18
- Earliest claimed: 2010-02-24
- Assignees: Vinghog AS
- Inventors: Sigvart Schøning-Olsen; Jan Marius Hektoen
- Web page: https://patentgrep.com/patent/US8333141B2

## CPC

- F41A 25/14: adjustable
- F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE

## Abstract

A recoil absorbing assembly is provided for automatic weapons secured to a weapon cradle having a fixed portion and a portion movable longitudinally thereto, the fixed cradle portion being rotatably mounted to a support, including a recoil absorbing spring and friction device arranged in connection with the cradle portions. Further the friction device includes a main shaft provided with angled friction blocks and a movable bearing housing surrounding the main shaft and having free floating pistons as to cooperate with the friction blocks, the recoil absorbing spring being situated on the main shaft in elongation of the bearing housing.

## Claims

### Claim 1

A recoil absorbing assembly for automatic weapons secured to a weapon cradle having an fixed portion (1) and a portion (2) movable longitudinally thereto, wherein the fixed cradle portion is rotatably mounted to a support, and wherein the assembly comprises a recoil absorbing spring (3) and a friction device (4, 5) arranged in connection with the cradle portions, wherein the friction device includes a main shaft (4) provided with angled friction blocks (6, 7) and a movable bearing housing (5) surrounding the main shaft, wherein the bearing housing (5) comprises free floating pistons (8, 9) arranged in the bearing housing (5) and spring biased against the friction blocks, the recoil absorbing spring (3) being situated on the main shaft in elongation of the bearing housing, wherein the main shaft (4) is provided with a mechanism (10, 11) that tunes the friction by pushing the friction blocks (6, 7) outwards, the friction tuning mechanism includes a shaft portion (10) longitudinally movable using a tension sleeve (11) arranged in an end of the main shaft (4) opposite of the friction blocks (6, 7).

### Claim 2 (depends on 1)

A recoil absorbing assembly according to claim 1, wherein the angled friction blocks (6, 7) are formed with inclined surfaces (12, 13) adjacent corresponding surface portions (14, 15) of the main shaft (4).

### Claim 3 (depends on 2)

A recoil absorbing assembly according to claim 2, wherein friction block surfaces (16, 17) opposite of the main shaft portion (10) are inclined vertically.

### Claim 4 (depends on 1)

A recoil absorbing assembly according to claim 1, wherein the movable bearing housing (5) is formed with bearings (18, 19) arranged at each end thereof and surrounding the main shaft (4).

### Claim 5 (depends on 4)

A recoil absorbing assembly according to claim 4, wherein the bearings (18, 19) are made from metal, preferentially bronze.

### Claim 6 (depends on 1)

A recoil absorbing assembly according to claim 1, wherein the free floating pistons (8, 9) are situated in a manner forming an angle to the main shaft (4), preferentially 4°.

### Claim 7 (depends on 6)

A recoil absorbing assembly according to claim 6, wherein the free floating pistons (8, 9) are provided with friction increasing portions (20, 21) adjacent the friction blocks (6, 7).

### Claim 8 (depends on 1)

A recoil absorbing assembly according to claim 1, wherein the free floating pistons (8, 9) are spring biased against the friction blocks (6, 7).

### Claim 9 (depends on 1)

A recoil absorbing assembly according to claim 1, wherein the main shaft (4) is connected to the fixed cradle portion (1), whereas the bearing housing (5) is connected to the movable cradle portion (2) by using brackets (22, 23, 24) situated in each end of the main shaft and one end of the bearing housing, respectively.