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Publication numberUS422930 A
Publication typeGrant
Publication dateMar 11, 1890
Filing dateApr 17, 1889
Publication numberUS 422930 A, US 422930A, US-A-422930, US422930 A, US422930A
InventorsGeorge H. Fox
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Lock for fire-arms
US 422930 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

(No Model.)



No. 422,930. atent'ed Mar. 11, 1890.

G'emge HEI.




SPECIFICATION forming part of Letters Patent No. 422,930, dated March 11, 1890.

Application filed April 17, 1889. Serial No. 307,577. (No model.)

To all whom it may concern..-

Be it known that We, GEORGE H. FOX and HENRY F. WHEELER, citizens of the United States, residing at Boston, in the county of Suifolk and State of Massachusetts, have invented certain new and useful Improvements in Looks for Fire-Arms; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which 1t appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

Thisinvention relates to improvements in looks for fire-arms, particularly that class termed double-acting, in which the trigger serves as a means both to cook the hammer as well as to release the latter from the sear in the act of discharging the weapon.

Our invention consists, in combination with a trigger and sear, of a fly, so called, hung upon the rear of the trigger, and which serves to swing and cock the hammer when a back ward pull is exerted upon the trigger; furthermore, in mechanism attached to the ham mer adjacent to the fly, whereby upon engagement of the sear in the full-cock notch, and when the pressure of the mainspring is transferred to the sear, said mechanism shall operate to release the fly from the hammer simultaneously with any diminution in the pull then existing upon the trigger. By such arrangement a very important result is accomplished. The weapon with such mechanism is provided with a double-action lock, so termed-that is, one in which a pull upon the trigger cooks the hammer, while a further continued pull releases said hammerto discharge the weapon; or, if desired, an ordinary cooking of thehammer can be produced, when a subsequent pull on the trigger will discharge the weapon, as generally desired in target practice, where precision of aim is necessary.

The general relation and operation of the parts as a complete organization will hereinafter be fully explained and described.

The drawings accompanying this specification represent in Figure 1 a sectional elevation of a revolving fire arm embodying my invention with the lock mechanism as positioned after the discharge of the weapon or prior to the cocking of the hammer. Fig. 2 represents the stock portion, showing the position of the lock mechanism immediately after the sear has engaged the hammer without the pull upon the trigger being diminished. Fig. 3 represents a similar "iew when the pull onthe trigger has ceased, showing the fly disengaged from the hammer. Fig. 4 is a sectional elevation of the hammer with the fly-releasing mechanism. Fig. 5 is a side elevation of the fly and the pawl for actuating the cylinder. Fig. 6 is an end View showing the manner of uniting the pawl and fly with the trigger. Fig. 7 is a perspective view of the fly.

I In the annexed drawings, A represents the stock portion, and B the barrel portion, including the cylinder and other co-operating parts, of a revolving fire-arm.

Our invention in the present instance pertains solely to the lock mechanism, in which the hammer is indicated at 2, the trigger at 3, sear at 4, and mainspring at 5, while the cylinder-actuating finger or pawl is shown at 6 and the fly at '7 Said parts-are arranged and bear the same relation as hitherto generally adopted in'weapons of this class, which contain double-action lock mechanism, so termed.

By our improvements the hammer can be cooked by a pulL upon the trigger and thenleft in engagement with the sear at full-cock. A pull on the trigger at any convenient subsequent time will then release the hammer,

or the hammer can be cooked by a pull on the trigger, while a continued further pull will release the hammer, as in ordinary double-action weapons. This is a great advantage, as it enables the weapon to be used, as desired, either for rapid continued firing or for intermittent firing, as in target practice.

By reference to Figs. 5, G, and 7 it will be seen that the cylinder-pawl 6 is pivoted on pin or stud 8, attached to the upper rear end of the trigger-head, the latter formed with cars, which straddle the lower end of the fly, also mounted upon said pin; further, the fly is vertically disposed, and the upper end terminates in a hook. Beneath the latter and upon that portion adjacent to the ham mer, which is furnished with a lip 9, is an abutment or shoulder 10. Laterally of said shoulder is a projection. engaging a spring 12, which is common to the fly and to the portion of the hammer is located a spring{ actuated pin 15, which is so situated as to contact with the face of the abutment on the fly, as will now be, described.

The operation of the lock mechanism in cooking the hammer is as follows: The various operating parts being in the several positions shown in Fig. 1, with the hammer down, a backward pull on the trigger 3 swings its rear portion upwardly, as likewise the'pawl '6 and fly 7. The abutment lO is in contact with the hammer, the lip 9 of the latter resting above it. By this means the hammer is actuated, swinging back until the sear 4 has entered the fullcock notch 14. Should the pull on the trigger be continued, the trigger wipes the tail of the sear, when I the hammer is released and falls by the action of the mainspring. This describes the relation and operation of the parts when the lock mechanism is used as a double-action one, the trigger-spring forcing the trigger .7 with its fly and pawl to resume their former positions.

the mainspring is transferred from the fly,

Assuming, however, that the weapon is to be employed for target practice and it is desired to simply cock the weapon,

the operation of theparts, as above described,

is the same until the-sear has engaged the.

full-cock notch of the hammer. The pull on the hammer is now removed in lieu of be.- ing continued. The result is that when the sear has locked the hammer the pressure of which then upheld the hammer and the opposing mainspring, to the sear as a support. When the fly is thus relieved from such pressure, the actuating bolt'or pin 15 is then free '1 to perform its duty, advancing outwardly from the hammer against the fly, and disengages In the weapon abovedescribed is shown an internal-hammer pistol-one which can be readily thrust in a pocket or holster without danger of catching the hammer and thereby causing accidental discharges. The hammer is concealed beneath a removable cap 16; further, in connection therewith, the hammer is provided with a shoulder 17, engaged by a safety locking-bolt 18. The latter is springactuated to remain in either an active or inactive position and projects in part exteriorly of the cap sufficient to enable said safety-bolt to be readily operated by the hand.

Fig.1 represents the hammer locked, while the lock mechanism is completely inoperative so long as the safety-bolt remains in the position shown.

What we desire to claim is-.--

1. The improved lock mechanism for firearms, consisting of a hammer, a sear, and a trigger, combined with a fly-operated by the trigger to cock the hammer and a spring affixed to the hammer, which operates to release the fly from the hammer immediately after the sear enters the full-cock notch, substantiallyas described.

2. The improved lock mechanism for firearms, consisting of a hammer, a sear, and a trigger, combined with a fly operated by the trigger to cook the hammer, and a movable projection carried by the hammer, but operated by means disconnected therefrom to re- 'as set forth.

a, hammer provided with spring-actuated mechanism which operates the fly to disengage the latter from the hammer immediately after the sear enters the full-cock notch, substantially as and for the purposes herein stated. A

4. The combination, with the hammer, the scar, and the trigger pivoted in the stock portion of a firearm, a pawl and fly pivoted to the trigger, and a spring actuating said. pawl and fly oppositely, of the abutment 10 on the fly, the lip 9 on the hammer, which interlock at certain definite times, and a spring-actu- IIO ated pin carried by thehammer and serving 3. The weapon is now cooked and the parts remain in the same relative positions until a renewed pull upon the'trigger causes the latter to release the sear and the hammer falls. v The advantages derived from this improved lock mechanism are obvious, as before premised. We do not, therefore, desire to be lim ited to the precise form of device for releasing the fly from the hammer, as many modi- I fied forms will readily suggest themselves to those skilled in the art.

to disengage said abutment and lip, substantially as herein specified.

In testimony whereof we affix oursignat'ures in presence of two witnesses.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3030723 *Aug 3, 1959Apr 24, 1962Ivy Jessie TFiring mechanism for a gas operated revolver
US3079718 *May 19, 1959Mar 5, 1963Allyn Harold DFiring mechanism with variable contact sear notch
US5160795 *Jul 29, 1991Nov 3, 1992Crosman CorporationGun with pivoting barrel, rotary ammunition cylinder, and double action firing mechanism
US5285766 *Jul 30, 1992Feb 15, 1994Crosman CorporationGun with removable rotary ammunition clip
US5400536 *Jun 22, 1992Mar 28, 1995Crosman CorporationGun with pivoting barrel, rotary ammunition cylinder, and double action firing mechanism
US5704150 *Sep 19, 1994Jan 6, 1998Crosman CorporationGun with pivoting barrel, rotary ammunition cylinder, and double action firing mechanism
US8359777Aug 1, 2008Jan 29, 2013Sturm, Ruger & Company, Inc.Light weight firing control housing for revolver
US8887429Jan 7, 2013Nov 18, 2014Sturm, Ruger & Company, Inc.Light-weight firing control housing for revolver
WO2009023531A1 *Aug 7, 2008Feb 19, 2009Sturm Ruger & CoLight-weight firing control housing for revolver