Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS3803741 A
Publication typeGrant
Publication dateApr 16, 1974
Filing dateJan 3, 1973
Priority dateJun 27, 1972
Publication numberUS 3803741 A, US 3803741A, US-A-3803741, US3803741 A, US3803741A
InventorsDucommun R
Original AssigneeInt Armament Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Safety device for a cylinder revolver
US 3803741 A
A safety device for a revolver wherein the cylinder is mounted on a pin which is selectably movable along its axis from a first fixed position at which the pin is free of engagement with the hammer to a second fixed position at which the pin engages the hammer to prevent it from reaching the firing position.
Previous page
Next page
Description  (OCR text may contain errors)

United States Patent Ducommun [75] Inventor: Rene Albert Ducommun, Staufen, P E S F b Switzerland rzmary xamtaeramue em erg Assistant Examiner-C. T. Jordan [73] Assignee: International Armament Attorney, Agent, or Firm-Cushman, Darby &

Corporation, Alexandria, Va. Cushman [22] Filed: Jan. 3, 1973 [21] Appl. No.: 320,766

[57] ABSTRACT [30] Foreign Application Priority Data June 27, 1972 Switzerland 9654/72 A Safety device for a revolver wherein the Cylinder is mounted on a pin which is selectably movable along 52 0.5. CI. 42/66 its axis from a first fixed position at which the p is s 1 Int. Cl F41c 17/04, F4lc 1/00 free of engagement with the m r to a on fixe 581 Field of Search 42/66, 65, 59 position at Whieh the p engages the hammer to P vent it from reaching the firing position. [56] References Cited UNITED STATES PATENTS 2 Claims, 3 Drawing Figures [65,098 6/1875 Hopkins 42/66 .15 7 if .1 i ,l I/

\\\\\\\ve\\ 12 11 u h i v 2a 4 SAFETY DEVICE FOR A CYLINDER REVOLVER The invention relates to a safety for a cylinder revolver having a hammer.

in the field of revolvers there already exist safety features which prevent the accidental firing of shots, for instance in the case of the revolver being dropped. The known arrangements operate in such a manner that they limit the movement of the hammer. However, these arrangements are complicated or they operate in such a manner that they do not satisfy all safety requirements and the regulations of many countries.

The purpose of the invention is to provide for a cylinder revolver having a hammer, a safety which restricts the movement of the hammer and which can be utilized independently of the usual safeties and which is simpler than the known safeties as far as construction and handling are concerned.

The principle of the invention is that the axis pin of the cylinder is formed in such a way as to act as a safety pin. The cylinder axis pin is provided with two annular grooves. The axis pin is mounted so as to be axially movable, except when restricted in its movement by a latch pin mounted laterally with respect to the revolver frame. The latch pin is held in position by a coiled spring arrangement which maintains the latch pin in a position which engages either the first or the second annular groove of the axis pin, thus restricting axial movement of the axis pin.

The invention will be explained in detail by reference to the following drawings:

H0. 1 shows, in cross section, the safety in its Safe position;

FIG. 2 shows the safety in the Off position, the revolver being ready for firing; and

FIG. 3 shows the safety after firing.

In the drawings the revolver is only demonstrated to such an extent as is necessary to understand the invention. The numeral 1 indicates the hammer which is under the pressure of the hammer spring 2 and which is restrained by the trigger 3. The scar tip 4 of trigger 3 is formed like a nose and cooperates with the full cock notch 5 and with two adjacent safety notches 6 and 6a on the hammer. The tip 4 of the trigger 3 engaging the safety notch 6a represents the traditional safety. A cylinder 7 is mounted inside frame 13 on a cylinder axis pin 8 which is rotatable and slidable. This cylinder axis pin 8 is characterized by two annular grooves, 10 and 11, with which a cylinder axis pin latch 9 cooperates. Numeral 12 indicates a shell which is hit by the firing pin 1a on the hammer at the moment of firing. Part of the barrel is shown as 14.

The operation of the safety will now be described. The safety in its Safe" position (FIG. 1) is arranged in such a way that the hammer 1 under pressure of the hammer spring 2 rests against the cylinder axis pin 8. In this position the hammer and the half cock notch 6 on the hammer l are held out of engagement with the sear tip 4 of the trigger 3.

It is the purpose of this invention to give the revolver a safety additional to the traditional one provided by the safety notch 6a. This is accomplished by the face that the cylinder axis pin latch 9, which is retained in the annular groove 10 of the axis pin 8 by means of a spring, not shown in this picture, serves as a stop which prevents the axis pin 8 from sliding longitudinally. When the cylinder axis pin latch 9 is depressed it is moved laterally in such a way that it moves out of engagement with the annular groove 10 of the cylinder axis pin 8, thus releasing the pin so that it can be moved axially. As a consequence, while groove 10 is engaged, the hammer l, and therefore the firing pin la, cannot possibly strike the cartridge 12. The result is a revolver absolutely safe against any uncontrolled activity, especially that caused by the revolver being dropped or by carelessness in operation of the hammer l or trigger 3.

The safety is put into Off" position by bringing the hammer l backwards into shooting position (full cock position). This way the sear tip 4 of the trigger 3en- The safety groove 10 should be arranged in such a manner that the safety becomes effective before the sear tip 4 of the trigger 3 engages the half cock safety notch 6 of the hammer l in order to avoid engagement of the trigger 3 while in safe position.

The above described feature has the advantage that, should the traditional safety fail, there is still an independent second safety available which restricts the hammer and consequently the firing pin 1a from striking the cartridge.

What is claimed is: x

l. A safety device for a revolver of the type including a cylinder for supporting a cartridge to be fired, a trigger-actuated hammer and a firing pin associated with said hammer for firing said cartridge upon contacting the cartridge, the device comprising:

an axially movable pin upon which the cylinder is mounted; and

means for selectively securing said movable pin in a first axial position out of engagement with said hammer and in a second axial position for engaging the hammer so as to restrain the firing pin from contacting the cartridge.

2'. A safety device asset forth in claim 1 wherein the pin in its second axial position engages the hammer so as to restrain it from contacting said trigger.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US165098 *Jun 7, 1875Jun 29, 1875 Improvement in safety-catches for revolvers
US720775 *Mar 15, 1902Feb 17, 1903Frank A BeckwithFirearm.
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4133127 *Nov 21, 1977Jan 9, 1979Armando PiscettaSafety device for obsolete cylinder firearms
US5704152 *Oct 22, 1996Jan 6, 1998Martin HarrisonSecure, quick release safety gun lock
US6336282 *Jan 18, 2000Jan 8, 2002Armi San Marco S.R.L.Device for automatically putting a revolver on safety
US6862830 *Sep 5, 2003Mar 8, 2005Forjas Taurus S.A.Safety device for guns
US7921589 *May 28, 2008Apr 12, 2011Freedom ArmsSingle action firearm action
U.S. Classification42/66
International ClassificationF41A17/00, F41A17/74
Cooperative ClassificationF41A17/74
European ClassificationF41A17/74