Knife

1. A knife comprising:

a handle;

a blade including a cutting edge and coupled to the handle so that the blade can pivot about a pivot point relative to the handle between an extended position and a retracted position, in the retracted position the blade is substantially received within the handle and in the extended position the cutting edge is exposed;

a first locking member configured to selectively retain the blade in the extended position and movable to allow the pivotal movement of the blade from the extended position to the retracted position;

a second locking member configured to selectively retain the blade in the retracted position and movable to allow the pivotal movement of the blade from the retracted position to the extended position; and

a push button that is movable relative to the handle, the push button operable to move the second locking member to allow the pivotal movement of the blade from the retracted position to the extended position.

2. The knife of claim 1 , wherein the cutting edge extends along a bottom edge of the blade, the blade further including a point adjacent a front end of the blade, and a hook located at a top edge of the blade.

3. The knife of claim 1 , wherein the cutting edge extends along a bottom edge of the blade, the blade further including a plurality of arcuate recesses that open toward a top edge of the blade.

4. The knife of claim 1 , wherein the blade includes a plurality of apertures that extend through the blade and each of the plurality of apertures includes an arcuate cutting edge.

5. The knife of claim 1 , wherein the cutting edge extends along a bottom edge of the blade, the blade further including a sharp projection that extends down from a generally flat portion of the blade that is not sharp.

6. The knife of claim 5 , wherein the handle includes a semi-circular recess such that the cutting edge can be used to cut a tube located in the semi-circular recess when the blade is positioned between the extended position and the retracted position.

7. The knife of claim 1 , further comprising a frame at least partially within the handle, wherein the first locking member is at least partially formed from a leaf spring portion of the frame.

8. The knife of claim 1 , further comprising a frame at least partially within the handle, wherein the second locking member is at least partially formed from a second leaf spring portion of the frame.

9. The knife of claim 8 , wherein the blade further includes a front end portion and a rear end portion, the rear end portion including a generally flat portion and a locking aperture.

10. The knife of claim 9 , wherein the first locking member includes a first actuator that is a tab portion of the frame, and the second locking member includes a projection and a second actuator that includes the push button to move the projection against the bias of the second leaf spring portion.

11. The knife of claim 10 , wherein the projection of the second locking member is received in the locking aperture of the blade to retain the blade in the retracted position and the projection is movable out of the locking aperture via the push button to allow the pivotal movement of the blade from the retracted position to the extended position.

12. The knife of claim 10 , wherein the first locking member engages the generally flat portion of the blade to retain the blade in the extended position, and the first locking member is movable out of engagement with the generally flat portion of the blade via the tab to allow the pivotal movement of the blade from the extended position to the retracted position.