# US 4,391,056 A · Retaining means for revolver cylinders

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- Number: US 4,391,056 A
- Document ID: US4391056A
- Status: Granted
- Kind: A
- Application number: 06/219,433
- Filed: 1980-12-23
- Granted: 1983-07-05
- Earliest claimed: 1979-12-27
- Assignees: Forjas Taurus S/A
- Inventors: Jose C. M. Bornancini
- Web page: https://patentgrep.com/patent/US4391056A

## CPC

- F41C 3/14: Revolvers (F41C3/10 takes precedence; sealing aspects F41A3/76; using a revolving drum magazine for feeding revolver-type guns other than revolvers F41A9/27; extractors or ejectors therefor F41A15/02)
- F41C: SMALLARMS, e.g. PISTOLS, RIFLES (functional features or details common to both smallarms and ordnance, mountings therefor F41A; projecting missiles without use of explosive or combustible propellant charge F41B); ACCESSORIES THEREFOR

## Abstract

A retaining means for revolver cylinders includes a resilient bushing which, upon being inserted in the cylinder bore, is engaged in an annular recess in a hollow cylinder axle making it impossible to disengage the two parts from one another after introducing an extractor mechanism in the bushing and threadedly connecting a sleeve of the mechanism with the threaded end of the extractor rod.

## Claims

### Claim 1

In a firearm including a frame, a hammer mounted in the frame, a barrel, a cylinder opening between said hammer and said barrel, a bore in the wall of the cylinder opening beneath said hammer, a cylinder rotatably mounted in said opening and tiltably movable out of said opening for the loading and extraction of cartridges therefrom, said cylinder having a centrally disposed bore, a hollow cylinder axle telescopically fitted within said cylinder bore, a cartridge extraction mechanism, said mechanism including an extractor rod having an inner end and an outer end, a star shaped member at the outer end of said rod, the improvement comprising a resilient bushing fitted in that end of the cylinder bore adjacent said hammer, said end of the cylinder bore having a recess therein, said recess being of lesser diameter than the diameter of the remainder of the bore, a projection extending into said recess, means on said bushing cooperating with said projection to fix said bushing against rotation, retaining means on the inner wall of said cylinder axle, retaining means on the outer wall of said bushing, whereby when said cylinder axle is moved axially in said cylinder bore from the barrel end of said frame toward said hammer, said cylinder axle retaining means and said bushing retaining means engage with each other and connect the bushing to said cylinder axle.

### Claim 2 (depends on 1)

A firearm according to claim 1 wherein, said bushing comprises a cylindrical body, having a flange at one end thereof, an annular shoulder at the other end thereof and a plurality of slots extending from the annular shoulder toward said flange, the means on said bushing cooperating with said projection comprising one of said slots.

### Claim 3 (depends on 1)

A firearm according to claim 1 wherein, said retaining means on said bushing comprises an annular shoulder at one end thereof and the retaining means on the inner wall of said cylinder axle comprises an annular recess into which said shoulder fits.

### Claim 4 (depends on 1)

A firearm according to claim 1 wherein, the inner end of said extractor rod is externally threaded and said rod has a groove extending longitudinally between said threaded end and said star, said projection engaging in said groove to prevent rotation of said extractor thereof.

### Claim 5 (depends on 4)

A firearm according to claim 4 wherein, said cartridge extraction mechanism includes a sleeve having a threaded bore, spring means and a central rod each of which are partially housed in said sleeve, the threaded end of said sleeve connected to the threaded end of said extractor rod.