Retractable utility knife

1. A utility knife, comprising:

a handle;

a blade holder connected to the handle by means that is movable about at least two axes for connecting the blade holder to the handle for movement in a single curvilinear path relative to the handle between a retracted position and an extended position;

a button assembly that is moveable along a transverse linear path with respect to the handle and that cooperates with the blade holder to move the blade holder to the extended position; and

a utility blade replaceably attached to the blade holder for selective removal and replacement of the utility blade.

2. The utility knife of claim 1 , wherein the handle further comprises a first aperture from which the blade holder projects in the extended position.

3. The utility knife of claim 2 , wherein the handle further comprises a second aperture from which the blade holder projects as it is moved between the retracted position and the extended position.

4. A utility knife, comprising:

a handle including a right side, a left side, a front face, and a top side, and a first aperture and a second aperture;

a blade holder connected to the handle by means that is movable about at least two axes for connecting the blade holder to the handle for movement in a curvilinear path relative to the handle between a retracted position and an extended position;

a utility blade replaceably attached to the blade holder for selective removal and replacement of the utility blade, wherein the first aperture is in the front face from which the blade holder projects in the extended position and the second aperture is in the top side from which the blade holder projects as it is moved between the retracted position and the extended position.

5. The utility knife of claim 4 , wherein the blade holder further comprises a slot having a vertical portion perpendicular to a horizontal portion, which cooperate to provide the blade holder with ability to move in the curvilinear path with respect to the handle.

6. The utility knife of claim 5 , the utility knife further comprises a button assembly that cooperates with the slot in the blade holder, wherein the button assembly pushes the blade holder to the extended position and the blade holder moves with respect to the button assembly.

7. A utility knife, comprising:

a handle;

a blade holder connected to the handle by means that is movable about at least two axes for connecting the blade holder to the handle for movement in a curvilinear path relative to the handle between a retracted position and an extended position with a top surface of the blade holder maintaining a substantially consistent perpendicular orientation with respect to a right side of the handle; and

a utility blade replaceably attached to the blade holder for selective removal and replacement of the utility blade.

8. The utility knife of claim 7 , wherein the handle further comprises a first aperture from which the blade holder projects in the extended position, a second aperture from which the blade holder projects as it is moved between the retracted position and the extended position, the right side, a left side, a front face, and a top side, wherein the first aperture is in the front face and the second aperture is in the top side.

9. The utility knife of claim 8 , wherein the blade holder further comprises a slot having a vertical portion perpendicular to a horizontal portion, which cooperate to provide the blade holder with ability to move in the curvilinear path with respect to the handle.

10. The utility knife of claim 9 , and further comprising a button assembly that cooperates with the slot in the blade holder, wherein the button assembly pushes the blade holder to the extended position and the blade holder moves with respect to the button assembly.

11. The utility knife of claim 7 , and further comprising at least two axes about which the blade holder is pivotally attached to the handle.