The present invention relates to a forward set trigger device for a firearm, comprising a striking element that is acted upon by a main spring and has a catch interacting with a locking element, which can be disengaged from the catch by a trigger blade via a release mechanism.
Trigger devices with a forward setting function are known, e.g. from AT 338 658, DE 297 09 330 U1 or DE 33 01 754 A1, and serve to bring the trigger blade in an unstable cocked position with especially low trigger weight by a forward setting movement, or set trigger movement, for precision shots. On the other hand, uncocking mechanisms are known for a long time for conventional trigger devices to uncock the main spring for safety purposes. The invention at hand sets its aim to equip a forward set trigger device with a safe uncocking mechanism.
This aim is achieved with a forward set trigger device of the type mentioned in the introduction, which is characterised by the novel combination of:
an uncocking mechanism for the main spring by means of which a main spring support facing away from the striking element can be brought into a position that uncocks the main spring; and
a forward setting mechanism of a kind known per se, having a spring element which is articulated to the trigger blade and supported on a stop and which can be brought into an unstable cocked position during a forward setting movement of the trigger blade;
wherein the uncocking mechanism brings the spring element out of its unstable cocked position when the main spring support is moved into the uncocked position.
In this way the forward setting mechanism is uncocked (“un-set”) while uncocking the main spring, so that the forward setting mechanism is uncocked in any case when recocking the firearm, thereby removing the danger of an accidental triggering of a shot. The safety of the forward set trigger device in use is thereby decisively increased.
According to a preferred feature of the invention, the main spring support has a nose which presses onto an adjusting screw of the trigger blade during uncocking to un-set the trigger blade, which yields a simple and effective safety mechanism.
Preferably said adjusting screw is accessible from the bottom side of the trigger blade, whereupon the uncocking mechanism of the forward setting mechanism can be adjusted to the uncocking mechanism of the striking mechanism without disassembling the weapon.
The forward set trigger device according to the invention can be combined with further features known per se from AT 336 658, according to which the stop of the spring element is adjustable via a screw and/or the unstable cocked position of the spring element is a biased beyond-dead center position and/or the spring element is a leaf spring, each ensuring an operation mode which is safe and not susceptible to breakdowns.
In a further preferred embodiment of the invention, the release member is mounted in a pivoting lever, which can be pivoted away from the locking element by means of the uncocking mechanism. Thereby faulty activations in the uncocked position can be prevented under all circumstances.
Preferably the uncocking mechanism has a cocking slide which moves the main spring support via a linkage, wherein especially preferably the cocking slide is lockable by means of a press button. Using a cocking slide for uncocking the forward setting mechanism enables a familiar usage for the user and requires only minor modifications at existing trigger devices to integrate the uncocking functionality according to the invention.
The forward set trigger device of the invention is suitable for all kinds of triggers, breeches and firearms, for example with striking elements of a firing pin or striking bolt type. A preferred application is a use with trigger devices with striking hammers, whose main spring support can be uncocked by a pivoting movement, which can be achieved by said cocking slide via a linkage.
The invention will be explained in greater detail hereinafter on the basis of exemplary embodiments illustrated in the accompanying drawings, in which:
In
According to
The cocking slide 17 protrudes in a known manner on the upper side of the housing of the weapon and can be slid via a gripping area 18 from the uncocked position shown in
In the cocked position of the main spring 11 (
For this reason, in the cocked position (
In the cocked position of
For the normal trigger function of the trigger blade 8 (dashed lines), the trigger blade 8 rests—with a trigger blade appendix 29 protruding from opposite of its pivot point 28 in the housing 6—tightly on the lower end 30 of the release bolt 24. In this position (see also function line 38) the release bolt 30 can be pressed up against the force of the spring 26 by drawing back the trigger blade 8 and thereby unlatching the locking element 20 from the catch 21 of the striking hammer 9 to fire the shot.
To activate the forward set trigger function, the trigger blade 8 is pressed forward from the dashed position as shown in
When setting the trigger blade 8, i.e. when moving the trigger blade appendix 29 down and distancing it from the lower end 30 of the release bolt 24, the spring element 31 is cocked or slightly bended (as a leaf spring) between the stop 33 and the hinge 32, until the points 33, 32 and 28 come into a stretched (or slightly overstretched) function line 37. This position constitutes an unstable force equilibrium, i.e. easily movable out of its stop position, of the kind of a biased beyond-dead center position. By slightly pressing the trigger blade 8 backwards, the stretched function line 37 is left and the unstable equilibrium is disturbed: The point 32 with the backward end of the trigger blade appendix 29 snaps up under the force of the spring element 31 and hits onto the lower end 30 of the release bolt 24, whereupon the locking lever 20 is disengaged from the striking hammer 9 and the shot is fired. In the forward set position, only a very small actuation weight is thus necessary to fire the shot.
The uncocking mechanism for the main spring 11, comprising i.a. the movable main spring support 12, the linkage 13, 15 and the cocking slide 17, is configured to uncock the forward set trigger mechanism of the trigger blade 8 while uncocking the main spring 11 (FIG. 2→
In the shown example, the main spring support 12 therefor has a nose 39 on the lower side, which can press onto the upper side of the trigger blade 8, more precisely on a side of the trigger blade 8 opposite side of the appendix 29 with respect to the pivot point 28. Optionally, the trigger blade 8 can here contain an adjusting screw 40, which is accessible and adjustable from the lower side of the trigger blade 8 via an opening 41. The nose 39 of the main spring support 12 thereby presses on the adjusting screw 40 of the trigger blade 8 during uncocking of the main spring 11 and thereby simultaneously uncocks the forward setting mechanism 31-38.
In the uncocked position of
Instead of a striking hammer 9, a different striking element can be used, e.g. a striking bolt with a striking lug as the catch 21. Instead of a spring element 31 embodied as a leaf spring, a tilting lever, arm or such, which is acted upon by a pressure spring, can be used. The forward setting mechanism could alternatively also be arranged at the side of the trigger blade 8 which is opposite to the pivot point 28, in which case the mechanical coupling between the uncocking mechanism and the forward setting mechanism acts on a corresponding other point of the trigger blade 8 or its forward setting mechanism. Also, instead of a cocking slide 17, a different kind of actuation element could be used for the uncocking mechanism, e.g. an uncocking lever or an uncocking wheel. Instead of a pivoting movement, the main spring 11 could, for example, also be uncocked by a linear movement, by mounting the main spring support 12 linearly movable.
The invention is thus not limited to the presented embodiments, but encompasses all variants and modifications thereof that fall within the scope of the appended claims.
Number | Date | Country | Kind |
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GM 50011/2012 | Feb 2012 | AT | national |
Filing Document | Filing Date | Country | Kind |
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PCT/AT2013/050020 | 1/24/2013 | WO | 00 |