Folding knife safety mechanism

1. A folding knife comprising:

a handle;

an internal cavity defined by the handle;

a blade rotatably coupled to the handle, the blade rotating with respect to the handle into and out of the internal cavity between a retracted position and an extended position, the blade defining a recess;

a sliding lock slidably coupled to the handle; and

a locking spring coupled to the handle, a first end of the locking spring interfaces with the recess when the blade is in the retracted position, the locking spring comprising a second end opposite the first end and a contiguous body that extends from the first end to the second end, wherein the second end is rigidly coupled to the handle, the locking spring interfaces against the sliding lock and biases the sliding lock away from a tip of the blade when the blade is in the retracted position.

2. The folding knife of claim 1 , wherein the blade rotates about a rotational axis with respect to the handle, and wherein the recess defines a first surface that is radially aligned with respect to the rotational axis.

3. The folding knife of claim 2 , wherein the first end of the locking spring interfaces against the first surface of the recess to bias the blade towards the retracted position.

4. The folding knife of claim 1 , wherein the first end of the locking spring interfaces against a tang of the blade.

5. The folding knife of claim 1 , wherein the first end pivots with respect to the second end.

6. The folding knife of claim 1 , wherein the first end of the locking spring does not interface with the blade when the blade is in the extended position.

7. The folding knife of claim 1 , wherein the handle comprises a top and a bottom opposite the top, wherein the locking spring comprises a middle portion that protrudes towards the bottom of the handle, and wherein the middle portion of the locking spring interfaces against the sliding lock.

8. The folding knife of claim 1 , wherein the handle extends along a longitudinal axis, and wherein the locking spring biases the sliding lock along the longitudinal axis.

9. The folding knife of claim 1 , wherein to rotate the blade from the retracted position to the extended position the locking spring is deformed such that the first end pivots relative to second end away from the recess.

10. A folding knife comprising:

a handle comprising a top and a bottom opposite the top;

an internal cavity defined by the handle;

a blade rotatably coupled to the handle, the blade rotating with respect to the handle into and out of the internal cavity between a retracted position and an extended position out of the bottom of the handle, the blade defining a recess;

a locking spring coupled to the handle, the locking spring comprises a middle portion that protrudes towards the bottom of the handle, a first end of the locking spring is within the recess when the blade is in the retracted position, the locking spring comprising a second end opposite the first end and a contiguous body that extends from the first end to the second end, wherein the second end is rigidly coupled to the handle; and

a sliding lock slidably coupled to the handle, wherein the sliding lock interfaces against the middle portion of the locking spring.

11. The folding knife of claim 10 , wherein the blade rotates about a rotational axis with respect to the handle, and wherein the recess defines a first surface that is radially aligned with respect to the rotational axis.

12. The folding knife of claim 11 , wherein the first end of the locking spring interfaces against the first surface of the recess to bias the blade towards the retracted position.

13. The folding knife of claim 10 , wherein the first end of the locking spring interfaces against a tang of the blade.

14. The folding knife of claim 10 , wherein the first end pivots with respect to the second end.

15. The folding knife of claim 10 , wherein the first end of the locking spring does not interface with the blade when the blade is in the extended position.

16. The folding knife of claim 10 , wherein the contiguous body of the locking spring comprises the middle portion that interfaces against the sliding lock.

17. The folding knife of claim 10 , wherein to rotate the blade from the retracted position to the extended position the locking spring is deformed such that the first end pivots relative to second end away from the recess.

18. A folding knife comprising:

a handle;

an internal cavity defined by the handle;

a blade rotatably coupled to the handle, the blade rotating with respect to the handle into and out of the internal cavity between a retracted position and an extended position, the blade defining a recess;

a locking spring coupled to the handle, the locking spring defining a first end and a second end, the first end of the locking spring is within the recess of the blade when the blade is in the retracted position, the second end of the locking spring defining a V-shape, the locking spring comprising a contiguous body that extends from the first end to the second end, wherein the second end is rigidly coupled to the handle; and

a sliding lock slidably coupled to the handle.

19. The folding knife of claim 18 , wherein the blade rotates about a rotational axis with respect to the handle, and wherein the recess defines a first surface that is radially aligned with respect to the rotational axis, and wherein the first end of the locking spring interfaces against the first surface of the recess to bias the blade towards the retracted position.

20. The folding knife of claim 18 , wherein the first end of the locking spring interfaces against a tang of the blade.

21. The folding knife of claim 18 , wherein the first end of the locking spring pivots with respect to the second end.

22. The folding knife of claim 18 , wherein the first end of the locking spring does not interface with the blade when the blade is in the extended position.

23. The folding knife of claim 18 , wherein the handle comprises a top and a bottom opposite the top, wherein the locking spring comprises a middle portion that protrudes towards the bottom of the handle.