US2259404A - Pistol firing mechanism - Google Patents

Description

x Oct. 14, 1941. F. WALTHER PISTOL FIRING MECHANISM Filed March 16, 1959 2 Sheets-Shet 1 Oct. 14, 1941'. F. WALTHER' 5 PISTOL FIRING MECHANISM Filed March 16, 1939 2 Sheets-sheaf 2 Patented Oct. 14, 1941 I 2,259,404 v PISTOL EIRING MECHANISM Fritz Walther, Zella-Mehlis, Germany Germany March 8, 1938 Applicatit}: March 16, 1939, Serial No. 262,188

3 Claims.

The invention relates to a striker cocking mechanism operated by the trigger with trig er slack for hand firearms proposed for a striker and trigger mechanism, whose striker piece is .held incocked positionindependently of the striker cocking mechanism operated by the trigger by engaging with the sear notch and which is released by actuation of the trigger. p

The continuous pull mechanism with double action trigger for pulling and cooking .with trigger slack hitherto known in hand firearms are open to the objection that increase in the trigger resistance for obtaining the trigger slack makes itself apparent even when the. already engaged striker piece is to be released by the trigger.

' This, however, makes it more difiicult to fire an accurate aimed. shot which requires that the trigger. moves very lightly. However,.a reduction of the trigger resistanceat the release of the engaged-striker piece results, in the'known.

Fig. 1 shows, partly in side elevation and partly in longitudinal section, an automatic pistol with a hammer and trigger mechanism for a double action trigger for pulling and. cooking,

Fig. 2 shows in side elevation on a'larger scale a the cocking piece serving at the same time as a scar and the cooking pawl forming the sliding member of the construction illustrated in Fig. 1

operating with the cam element accelerating the cocking movement oi. the hammer,

Fig. 3 shows in side elevation the hammer, the

trigger bar and the trigger with the coordinatedelements on a larger scale than shown in Fig. 1, and r Fig. 4 shows a top plan view of the cocking piece in the position shown in Fig. 3.

constructions, in a weakening of the pressure point effect of the continuous pull mechanism.

The invention overcomes this objection in that a cam element accelerating the cocking movement of the striker piece is arranged on the sliding path of that part of the striker cocking mechanism which participates 'in the sliding oif movementfor the release of thestrlker piece, the cam element being arranged directly in front of the pointfrom which the sliding ofi takes place. The cam element may be formed by providing a projection, a cam or a groove. the striker piece by means of thestriker cocking mechanism, the increase in the trigger resistance will become apparent when the sliding member connected-to the striker piece reaches the cam element; If, on the other hand, the striker piece is cocked by engagement with thesear notch and not by the striker cocking mechanism, the sliding member connected to the striker piece and the cam element will not become operative when the striker piece is released. 'The trigger acts, on the sear withthe result-that the trigger resistance is not influenced by the trigger'slack arrangemention the striker cocking mechanism. The trigger'in this instance can be set so light- 1y, that it meets all requirements; 'A' trigger slack effect is also present due to the difference in trigger resistance between the idle motion of the trigger with the parts connected thereto and .the. subsequent displacement of the sear whose releasing displacement is only extremely short.

An embodiment of the invention is illustrated by way of example, in the accompanying drawings, in which:

When cockin The hammer and trigger mechanism with a double action trigger is accommodated in a frame I to which it is secured. The double action trigger mechanism consists of a trigger .Latrigger bar 3, a cocking piece I mounted at both sides on the frame and serving as a sear too and having a transverse cam member 6, a hammer 6 and a cooking pawl I mounted on the hammer and forming the sliding member, and whose lower end is continually pressed away from the hammer 6 by a spring 8. The main spring, not shown in the drawings. acts in the direction of .the arrow on a hammer operating rod 9 which'in turn transmits the force exerted by the main'spring upon the hammer 6 forming the striker piece.'. The major portion of the upper surface of the cam member 5 constitutes a curved cam portion or element l3 for engagement with the cocking pawl l. I

When the trigger 2 is in its position of rest the cam member 5 oscillatable about the axle I0 is in its lowermost position. The .lower end of the cooking pawl 1 is over the cam portion l3. By

pulling the trigger 2 the cam portion I3 is raised by the engagement of the trigger bar 3 with the cocking piece I. The cam portion forming the sliding path for the cocking pawl I bears against the cooking pawl which in turn moves the ham-' mer 6 in the cooking direction. A relative movement then' takes place between the two parts such a manner, that the'cocking pawl 1' slides over the cam portion l3 until it slides of! with the result that the cooked hammer 6 loses its support and jumps forward v A roove I4 is cut in the upper surface ofthe I cam member 6 adiacent the first cam-portion l3 shortly before the sli in ofl edge. The rear wall of-the groove it constitutes a second cam portion or element l5. As soon as the edge of the pawl 1 enters the groove l4 during the cocking of the firearm by means of the continuous pull mechanism, it must slide, during the continued pulling over the second cam portion l5 whereby the cocking resistance is increased, This second cam portion acts like a kind of accelerating cam. The cocking speed of the hammer increases and consequently the resistance on the trigger 2 also increases suddenly.

As already mentioned, no increase in the trigger resistance takes place when the hammer 6 is cocked, for example, by the recoiling breech block, to such an extent that its nose It engages in the notch I in the cocking piece in this action forming'the sear. The cocking pawl I is then not in contact with the cam member 5. At the release of the hammer 6 the cam member 5 already lifted by the hammer nose lli is additionally raised by the trigger so far that the hammer nose l6 leaves the notch l'l in the cocking piece 5, with the result that the hammer 6 is precipitailed forward. As the cocking pawl I in this instance does not participate in the releasing operation, no increase in the trigger resistance takes place. A trigger slack effect is perceivablc also in this instance. It is based, however, as already mentioned in the opening paragraph, on the difference of the trigger resistance which results when the trigger has terminated its idle movement and then engages the sear and moves the same, in overcoming the additional resistance which occur, into the position releasing the hammer. Such an increase of the trigger resistance like a trigger slack also exists in the The I I claim:

1. In a firearm ,having a frame, a trigger pivoted to the frame, a hammer adapted to be cocked either by direct actuation or by a pull on the trigger, a sear member pivoted to said frame, a bar pivotally connecting said trigger and sear, said sear having a shoulder thereon for releasably holding said hammer when the hammer is cooked by direct actuation, a first cam portion on the sear member for cooking said hammer by means of said trigger, and a second cam portion on the sear member near the hammer-releasing edge of said first cam portion, whereby cocking movement of the hammer is suddenly accelerated just before release.

2. 'In a firearm having aframe, a trigger pivoted to the frame, a hammer adapted to be cocked either by direct actuation or by a pull on the trigger. a scar member pivoted to said frame, a bar pivotally connecting said trigger and sear, said seanhaving a shoulder thereon for releasably holding said hammer when the hammer is cocked by direct actuation, a first cam portion on the sear member for cocking said hammer by means of said tri ger, and a second cam portion on the leasably holding said hammer when the hammer is in cooked or direct actuation, a first cam portion on the sear member for cooking said hammer by means of said trigger, and a second cam portion on the sear member near the hammerreleasing edge of said first cam portion, whereby cocking movement of the hammer is suddenly accelerated just before release.

' Rrrz WALTHER.

Images