Apparatus for supporting firearm, firearm assembly, and method of reducing shock of firing

1. A firearm assembly comprising:

a base;

a firearm coupling unit configured to move forward or backward with respect to the base;

an elastic support unit configured to elastically support the firearm coupling unit;

a return delay unit configured to reduce speed at which the firearm coupling unit returns to a coupling unit original forward position; and

a firearm mounted on the firearm coupling unit and comprising:

a bolt assembly configured to move backward or forward; and

a return spring configured to elastically support the bolt assembly,

wherein upon firing the firearm, the firearm coupling unit is configured to return to a coupling unit original forward position after completion of the bolt assembly returning to a bolt assembly original forward position.

2. The firearm assembly of claim 1 , wherein the firearm coupling unit is configured to move forward or backward between the coupling unit original forward position and a coupling unit backward position in each firing, and

wherein the bolt assembly is configured to move forward or backward between the bolt assembly original forward position and a bolt assembly backward position in the each firing.

3. The firearm assembly of claim 2 , wherein the coupling unit original forward position comprises a position where no gap exists between the firearm coupling unit and the base in a moving direction of the firearm coupling unit, and

wherein the bolt assembly original forward position comprises a position where no gap exists between the bolt assembly and the firearm in a moving direction of the bolt assembly.

4. The firearm assembly of claim 1 ,

wherein the coupling unit original forward position comprises a position where no gap exists between the firearm coupling unit and the base in a moving direction of the firearm coupling unit.

5. The firearm assembly of claim 4 , wherein the return delay unit comprises a damper configured to dissipate kinetic energy of the firearm coupling unit, and

wherein the damper is configured to generate a first damping force corresponding to forward movement of the firearm coupling unit larger than a second damping force corresponding to backward movement of the firearm coupling unit.

6. The firearm assembly of claim 5 , wherein the damper comprises a Magneto-Rheological (MR) fluid damper, and

further comprising a control unit configured to control viscosity of a fluid contained in the MR fluid damper according to a movement direction of the firearm coupling unit.

7. The firearm assembly of claim 4 , wherein the return delay unit comprises a frictional force generator configured to generate a frictional force resisting movement of the firearm coupling unit in response to forward movement of the firearm coupling unit.

8. The firearm assembly of claim 7 , wherein the frictional force generator comprises:

a pressure friction unit configured to move into a firearm coupling unit path;

a spring configured to elastically support the pressure friction unit;

a spring mount configured to support the spring; and

a spring mount movement unit configured to control movement of the spring mount,

wherein the spring mount movement unit is configured to move the spring mount in a direction to approach the firearm coupling unit in response to the forward movement of the firearm coupling unit.

9. The firearm assembly of claim 5 , wherein the damper comprises:

a cylinder configured to contain a fluid;

a piston head configured to move in the cylinder in response to movement of the firearm coupling unit; and

a check valve configured to control an amount of the fluid to pass through the cylinder according to a movement direction of the firearm coupling unit.

10. The firearm assembly of claim 1 , wherein the elastic support unit and the return delay unit are arranged in parallel.

11. An apparatus for supporting a firearm, the apparatus comprising:

a base;

a firearm coupling unit to which the firearm is mounted and configured to move forward or backward with respect to the base;

an elastic support unit configured to elastically support the firearm coupling unit; and

a return delay unit, upon firing of the firearm, configured to reduce speed at which the firearm coupling unit returns to a coupling unit original forward position,

wherein the firearm coupling unit is configured to complete returning to the coupling unit original forward position after a bolt assembly of the firearm completes returning to a bolt assembly original forward position.

12. The apparatus of claim 11 , wherein the firearm coupling unit is configured to move forward or backward between the coupling unit original forward position comprising a position where no gap exists between the firearm coupling unit and the base in a moving direction of the firearm coupling unit and a coupling unit backward position in each firing, and

wherein the bolt assembly is configured to move forward or backward between the bolt assembly original forward position comprising a position where no gap exists between the bolt assembly and the firearm in a moving direction of the bolt assembly and a bolt assembly backward position in the each firing.

13. The apparatus of claim 11 , wherein the return delay unit comprises a damper configured to generate a first damping force corresponding to forward movement of the firearm coupling larger than a second damping force corresponding to backward movement of the firearm coupling unit.

14. The apparatus of claim 13 , wherein the damper comprises:

a cylinder configured to contain a fluid;

a piston head configured to move in the cylinder in response to movement of the firearm coupling unit; and

a check valve configured to control an amount of the fluid to pass through the cylinder according to a movement direction of the firearm coupling unit.

15. The apparatus of claim 13 , wherein the damper comprises a Magneto-Rheological (MR) fluid damper, and

further comprising a control unit configured to control viscosity of a fluid contained in the MR fluid damper according to a movement direction of the firearm coupling unit.

16. The apparatus of claim 11 , wherein the return delay unit comprises a frictional force generator configured to generate a frictional force resisting movement of the firearm coupling unit in response to forward movement of the firearm coupling unit.

17. The apparatus of claim 16 , wherein the frictional force generator comprises:

a pressure friction unit configured to move into a firearm coupling unit path;

a spring configured to elastically support the pressure friction unit;

a spring mount configured to support the spring; and

a spring mount movement unit configured to control movement of the spring mount,

wherein the spring mount movement unit is configured to move the spring mount in a direction to approach the firearm coupling unit in response to the forward movement of the firearm coupling unit.

18. The apparatus of claim 11 , wherein the elastic support unit and the return delay unit are arranged in parallel.

19. A method of reducing a shock of firing, the method comprising:

firing a firearm;

moving backward the firearm and a bolt assembly provided in the firearm in response to the firing;

returning the firearm and the bolt assembly to respective positions before the firing;

delaying the returning of the firearm to the position of the firearm before the firing;

completing the returning of the bolt assembly to a position of the bolt assembly before the firing; and

completing the returning of the firearm to a position of the firearm before the firing after the completing of the returning the bolt assembly.

20. The method of claim 19 , wherein the delaying the returning the firearm comprises increasing a first damping force corresponding to forward movement of the firearm from a second damping force corresponding to backward movement of the firearm.

21. The method of claim 19 , wherein the delaying the returning the firearm comprises generating a frictional force in a direction that is configured to resist forward movement of the firearm to the position of the firearm before the firing.

22. The method of claim 19 , wherein the returning the fire arm is performed by an elastic support unit and the delaying the returning the firearm is performed by a return delay unit and

wherein the elastic support unit and the return delay unit are arranged in parallel.