Double action pistol

A rotatably mounted hammer lock member has a hammer stop abutment. The trigger rod has a first operating projection received in a recess of the hammer lock member such that a reciprocal movement of the trigger rod causes a corresponding rotational movement of the hammer lock member. An interrupter member is hingedly mounted to the hammer. A projection at the rear end of the trigger rod is loosely received in a recess of this interrupter member. The rear end of the trigger rod includes a chamfered control surface area. The frame of the gun includes a corresponding chamfered control surface area. When the trigger rod is moved by the trigger for firing the gun, it rotates the hammer lock member such that its hammer stop abutment will be moved out of the way of the hammer.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
The present invention relates to a double action pistol including a slide, 
a frame, a firing pin, a hammer, a trigger rod and a trigger pivotably 
mounted thereto, and including a means for decocking and locking the 
hammer. 
2. Description of the Prior Art 
Generally known pistols include a mechanism for a manual releasing of the 
safety catch of the firearm. The operation of the safety catch is of 
specific importance if such pistol is carried in a loaded condition, ie 
when a round is loaded in the chamber. It is now generally known that 
specifically in such case a possible manual releasing of the safety catch 
of the gun can lead to a failing of the person having to fire the gun 
specifically if such person is in a stress situation. 
SUMMARY OF THE INVENTION 
It is, therefore, a general object of the invention to provide a double 
action pistol having no separately operable safety catch operating member, 
and does not need a special decocking arm for a decocking of the hammer 
after a loading movement, and which pistol functions to fire merely upon 
the operating of the trigger mechanism. 
A further object of the present invention is to provide a double action 
pistol of which the hammer decocking and locking means include a rotatably 
mounted hammer lock member having a hammer stop abutment, which hammer 
lock member is rotatable between a hammer locking and a hammer release 
position, and the trigger rod having a first operating projection received 
in a recess of the hammer lock member; and having further an interrupter 
member pivotably mounted to the hammer and having a recess in which a 
second operating projection of the trigger rod is received; whereby a 
trigger-caused translatory movement of the trigger rod is transformed into 
a rotary movement of the hammer lock member and simultaneously transmitted 
by the interrupter member to the hammer such to be transformed into a 
pivoting movement thereof.

DESCRIPTION OF THE PREFERRED EMBODIMENT 
The cross-sectional view of the pistol illustrated in FIG. 1 is so far 
merely for the purpose of illustrating a present preferred embodiment of 
the invention. Accordingly, only those structural members are identified 
by reference numerals which are necessary for understanding the present 
invention. The other important parts of this pistol are generally known to 
the person skilled in the art. FIG. 2 illustrates on an enlarged scale a 
section through the same pistol as illustrated in FIG. 1, whereby however 
more parts or structural units, respectively, of the embodiment of the 
invention are shown. 
The pistol includes a hammer 1, pivotably supported by a pin 18 defining 
the pivot axis of the hammer at the frame 9 of the gun. This allows the 
well-known pivoting, ie cocking and decocking movement of the hammer 1. 
The gun is equipped with the trigger 5 that is pivotably mounted on the 
one hand to the frame 9 and on the other hand to the trigger rod 4. The 
trigger rod 4 extends from the trigger 5 back towards the general area of 
the hammer 1 of the pistol. At its rear end, the trigger rod 4 is designed 
with a first projection 13 and an adjacently located second projection 16, 
which projections are designed in the sectional view of FIG. 3. The first 
projection 13 is taller than the second projection 16. The first, taller 
projection 13 extends into a recess 14 of a hammer lock member 2, 
sometimes termed sear, which hammer lock member 2 is illustrated 
separately in FIG. 5. The hammer lock member 2 is supported on a pin 8, 
mounted in turn in the frame 9. Accordingly, this pin 8 defines a rotation 
axis of the hammer lock member 2. The hammer lock member 2 includes 
furthermore a hammer stop abutment 12. When considering in FIG. 2 only the 
trigger rod 4 and its operating projection 13 extending into the recess 14 
of the hammer lock member 2, it is obvious that a translatory movement of 
the trigger rod 4, specifically to the right-hand side of FIG. 2, will 
cause the hammer lock member 2 to rotate counter-clockwise around pin 8 
such that the hammer stop abutment 12 makes a corresponding circular 
movement around the pin 8. 
Somewhat adjacent the hammer lock member 2 an interrupter member 3 is 
located. This interrupter member 3, which is illustrated best in FIG. 4, 
is pivotably mounted to the hammer 1 via a pin 24 illustrated in FIGS. 2 
and 4. 
The second, lower operating projection 16 of the trigger rod 4 projects 
into a recess 15 of the interrupter member 3. Accordingly, a translatory 
movement of the trigger rod 4 will cause a translatory movement of this 
interrupter member 3 which, since it is pivotably mounted via the pin 24 
to the hammer 1 will cause a pivoting, ie cocking and decocking, 
respectively, movement of the hammer 1 around its pin 18. The frame 9 
includes a support 25, see FIG. 2, for this interrupter member 3, 
preventing it from pivoting downwards (anti-clockwise around pin 24) in 
case of the second operating projection 16 of the trigger rod 4 moving 
away out of the recess 15. 
At its rear end that includes the two operating projections 13 and 16, the 
trigger rod 4 has a chamfered control surface area 20. The frame 9 has a 
further chamfered control surface area 21 which is aligned with the first 
named control surface area. If, as will be explained lateron more in 
detail, the rear end of the trigger rod 4 glides due to its control 
surface area 20 along and downward the chamfered control surface area 21 
of the frame 9, the second operating projection 16 of this trigger rod 4 
can indeed move completely out of the recess 15 of the interrupter member 
3 such that the interrupter member 3 comes to lie on top of the above 
mentioned support 25 formed in the frame 9. 
Turning again to the hammer 1, FIG. 1 illustrates that the hammer 1 
includes an abutment 17 co-operating with the hammer stop abutment 12 of 
the hammer lock member 2. The reference numeral 19 identifies the firing 
pin striking area of the hammer 1. 
The illustrated embodiment includes, furthermore, the as such well-known 
hammer spring 10 acting onto the rod-shaped spring guide 11, which is 
biassed against the hammer 1 to cause it to strike the firing pin 6 upon 
its releasing. The firing pin 6 is located according to wellknown designs 
in the slide 7 of the gun. 
The lower side of the hammer 1 includes, furthermore, an oblique bottom 
resting surface 22. The rod-shaped spring guide includes likewise an 
oblique top supporting surface 23 onto which the bottom resting surface 22 
of the hammer 1 rests in the illustrated state thereof. These two surfaces 
are illustrated by means of one common dashed line in FIG. 2. 
Now, the operating of this embodiment of the invention will be described in 
detail, whereby it will become obvious that the hammer 1 is secured 
against an accidental striking or contacting the firing pin 6 up to a 
complete pulling of the trigger 5 into its (right-hand) terminal position, 
which is arrived at specifically by means of the hammer lock member 2. 
If the gun is loaded (or after each firing), the slide 7 is moved backwards 
(based on the illustration of FIG. 2) on the frame 9, which backward 
movement is made when loading the gun anew manually or then is produced by 
the recoil movement after a shot has been fired. This backward movement of 
the slide 7 causes the hammer 1 to pivot around its pin 18 against the 
restoring force of the hammer spring 10. The interrupter member 3 is 
pivotably mounted via the pin 24 to the hammer 1. Accordingly, the 
pivoting movement of the hammer 1 causes a backward (to the right-hand 
side) movement of the interrupter member 3. 
The tooth 26 of the interrupter member 3, limiting one side of the recess 
15 (see FIG. 4), pulls the trigger rod 4 and accordingly the trigger 5 
backwards. Furthermore, the first operating projection 13 of the trigger 
rod 4 which projects into the recess 14 of the rotatable hammer lock 
member 2 causes the hammer lock member 2 to make a limited rotary movement 
around its pin 8. 
The next following forward movement of the slide 7 allows to forward one 
round out of the magazine into the chamber of the gun. Simultaneously, the 
hammer 1 is decocked and urged due to the action of the hammer spring 10 
again forward, ie in the direction to the firing pin 6 or slide 7, 
respectively. This pivoting decocking movement of the hammer 1 causes the 
interrupter member 3 to move forward, ie to the left, such that its 
abutment 27 (FIG. 4) limiting the recess 15 at its other side acts onto 
the second operating projection 16 of the trigger rod 4, moving the 
trigger rod together with trigger 5 forwards. 
This decocking movement of the hammer 1 causes via the first projection 13 
of the trigger rod 4, furthermore, the hammer lock member 2 to rotate 
clockwise around its pin 8 and into the rotational position as illustrated 
specifically in FIG. 2. In this position, the hammer stop abutment 12 of 
the hammer lock member 2 abuts flatly the abutment 17 of the hammer 1 such 
that its firing pin striking area 19 is kept at a small distance away from 
the firing pin 6. 
The gun is now ready to be fired. 
For the firing of the gun the trigger 5 is pulled and accordingly the 
trigger rod 4 is moved backwards. The second projection 16 at the end of 
the trigger rod 4 projecting into the recess 15 (FIG. 4) is urged against 
the abutment 27 backwards. Simultaneously, the first projection 13 of the 
trigger rod 4 projecting into the recess 14 of the hammer lock member 2 
(FIG. 5) comes to rest against the area 28 of the hammer lock member 2, 
such that the backward movement of the trigger rod 4 causes here an 
anti-clockwise rotation of the hammer lock member 2. 
Shortly before reaching the rearmost position of the trigger 5, the trigger 
rod 4 contacts via its rearward chamfered control surface area 20 the 
corresponding chamfered control surface area 21 of the frame 9 (which may 
be a separate member mounted to the frame) and accordingly guided 
downwards at its rear end. For the sake of order it must be mentioned that 
a spring (see FIG. 1) acting between the trigger 5 and the trigger rod 4 
urges the trigger rod 4 upwards, ie into the recesses 14 and 15 of the 
hammer lock member 2 and interrupter member 3, respectively. 
Due to this lateral downward movement of the rear end of the trigger rod 4, 
its second projection 16 moves out of the recess 15 of the interrupter 
member 3 such that it clears the interrupter member 3 completely. 
At the same time, the hammer lock member 2 has been rotated anti-clockwise 
such that its hammer stop abutment 12 has left the position illustrated in 
FIG. 2, it has moved upwards and along a circular path away from the 
illustrated position. (The hammer 1 is standing now oblique, it is 
cocked.) The longer operation projection 13 of the trigger rod 4 remains, 
however, located inside the recess 14 of the hammer lock member 2, such 
that it is definitely held in this upturned rotary position. 
As soon as the projection 16 has cleared the recess 15 of the interrupter 
member 3 and accordingly due to the force of the hammer spring 10, the 
hammer 1 is snapped into its firing pin striking state because now it is 
not prevented from striking the firing pin 6 by the hammer stop abutment 
12 of the hammer lock member 2. 
After the shot has been fired, the same slide 7 initiated movements of all 
members as initially explained re-occur. 
The hammer 1 begins its firing movement in a snapwise fashion. In order now 
to be guided back into its rest position as illustrated in FIG. 2, the 
hammer 1 is equipped at its bottom end with an oblique bottom resting 
surface 22. The rod-shaped spring guide 11 has a similarly obliquely 
extending top supporting surface 23. The rodshaped spring guide 11, still 
being urged by the hammer spring 10 against the hammer, causes now the 
mentioned two surfaces 22 and 23 to flatly abut each other in a surface 
contact, thus guiding the hammer 1 into the illustrated position where its 
firing pin striking area 19 is at a distance from the firing pin 6. 
While there is shown and described a present preferred embodiment of the 
invention, it is to be distinctly understood that the invention is not 
limited thereto, but may be otherwise variously embodied and practiced 
within the scope of the following claims. Specific details of the 
invention may thus be used elsewhere, eg in revolvers.