Trigger return spring mechanism
A trigger return spring assembly mountable on a frame of a firearm includes a trigger mounted on the frame pivoting about a first axis of rotation. A trigger bar attached to the trigger pivots relative to the trigger about a second axis of rotation fixed on the trigger. A bore extends through the trigger along a third axis oriented transversely to and positioned between the first and second axes of rotation. A plunger extends through the bore and is movable along the third axis. A first end of the plunger is attached to the trigger bar and a second end has a retaining surface oriented transversely to the third axis. A shoulder is positioned within the bore proximate to the trigger bar. A compression spring captured within the bore, between the shoulder and the retaining surface, exerts a force pushing the retaining surface away from the shoulder.
1. A trigger return spring assembly for a firearm comprising a frame, said trigger return spring assembly comprising:
a trigger mountable on said frame for pivoting motion about a first axis of rotation fixed on said frame;
a trigger bar attached to said trigger and pivotable relatively thereto about a second axis of rotation fixed on said trigger;
a bore extending through said trigger along a third axis oriented transversely to and positioned between said first and second axes of rotation;
a shoulder positioned within said bore proximate to said trigger bar;
a plunger extending through said bore and movable along said third axis, a first end of said plunger being attached to said trigger bar, a second end of said plunger comprising a retaining surface oriented transversely to said third axis; and
a compression spring captured within said bore between said shoulder and said retaining surface and exerting a force pushing said retaining surface away from said shoulder.
2. The trigger return spring assembly according to claim 1 , wherein said first end of said plunger terminates in a first head, and said second end of said plunger terminates in a second head.
3. The trigger return spring assembly according to claim 2 , wherein said retaining surface is located on said second head facing said spring.
4. The trigger return spring assembly according to claim 2 , wherein said second head is rotatable about a fourth axis transverse to said third axis.
5. The trigger return spring assembly according to claim 2 , further comprising a yoke mounted on said trigger bar, said first head pivotally engaging said yoke.
6. The trigger return spring assembly according to claim 1 , further comprising a first pin attaching said trigger bar to said trigger.
7. The trigger return spring assembly according to claim 1 , further comprising a second pin attaching said trigger to said frame.
8. A firearm, said firearm comprising:
a frame;
a trigger return spring assembly comprising:
a trigger mounted on said frame for pivoting motion about a first axis of rotation fixed on said frame;
a trigger bar attached to said trigger and pivotable relatively thereto about a second axis of rotation fixed on said trigger;
a bore extending through said trigger along a third axis oriented transversely to and positioned between said first and second axes of rotation;
a shoulder positioned within said bore proximate to said trigger bar;
a plunger extending through said bore and movable along said third axis, a first end of said plunger being attached to said trigger bar, a second end of said plunger comprising a retaining surface oriented transversely to said third axis; and
a compression spring captured within said bore between said shoulder and said retaining surface and exerting a force pushing said retaining surface away from said shoulder.
9. The firearm according to claim 8 , wherein said first end of said plunger terminates in a first head, and said second end of said plunger terminates in a second head.
10. The firearm according to claim 9 , wherein said retaining surface is located on said second head facing said spring.
11. The firearm according to claim 9 , wherein said second head is rotatable about a fourth axis transverse to said third axis.
12. The firearm according to claim 9 , further comprising a yoke mounted on said trigger bar, said first head pivotally engaging said yoke.
13. The firearm according to claim 8 , further comprising a first pin attaching said trigger bar to said trigger.
14. The firearm according to claim 8 , further comprising a second pin attaching said trigger to said frame.