Safety cutter apparatus and system

1. A cutter apparatus, comprising:

a housing sized to be hand-held, the housing including a channel and openings adjacent to the channel at three different sides of the housing; and

a blade carrier sized to fit within and slide along the channel, the blade carrier including three engaging portions that extend from the openings such that a force bearing upon any of the portions can cause the blade carrier to slide along the channel, the blade carrier being repositionable from and in relation to a fully retracted position of the blade carrier, one of said engaging portions when the blade carrier is repositioned away from the fully retracted position during a blade replacement operation being engaged at the side opening of the housing through which said engaging portion extends preventing lateral movement of the blade carrier away from said side opening of the housing, and said side opening at a rear portion thereof being shaped such that said engaging portion is not engaged by said side opening when the blade carrier is in the fully retracted position.

2. The cutter apparatus of claim 1 , wherein the blade carrier includes blade installation instructions thereon and the instructions include an image of a blade shown correctly oriented for installation on the blade carrier.

3. The cutter apparatus of claim 1 , wherein the housing is made at least in part from a plastic.

4. The cutter apparatus of claim 1 , wherein the blade carrier is configured to secure a blade to the cutter apparatus such that a cutting edge of the blade faces a bottom side of the housing, and the housing includes a metal skid plate which is secured to a bottom side of the housing defining a portion of an opening that faces the blade when the blade carrier is in an extended position.

5. The cutter apparatus of claim 1 , wherein the housing and the blade carrier are shaped such that a cutting force applied to the housing when the blade carrier is in an extended position causes a top edge of the blade carrier to come into contact with the housing to frictionally lock the blade carrier in the extended position until the cutting force is removed.

6. The cutter apparatus of claim 1 , wherein the housing includes dual flange members which are snap fitted through a channel in the blade carrier.

7. The cutter apparatus of claim 1 , further comprising:

a spring configured to push the blade carrier toward a retracted position away from a distal end of the housing.

8. The cutter apparatus of claim 1 , wherein at least one of the engaging portions includes a gripping surface.

9. The cutter apparatus of claim 8 , wherein the gripping surface includes ridges.

10. The cutter apparatus of claim 1 , wherein the housing includes recessed outer surface portions within which the openings are formed.

11. The cutter apparatus of claim 10 , wherein the recessed outer surface portions extend longitudinally along the housing.

12. The cutter apparatus of claim 10 , wherein at least one of the engaging portions includes a top surface that is substantially flush with an outer surface of the housing adjacent to one of the one or more recessed outer surface portions.

13. The cutter apparatus of claim 1 , wherein the housing includes an indented portion sized to receive spare blades.

14. The cutter apparatus of claim 1 , wherein the housing includes two housing portions that are pivotally coupled together.

15. The cutter apparatus of claim 14 , wherein one of the two housing portions includes a threaded channel, and further including:

a screw configured for securing the two housing portions together, the screw having a threaded surface complementary to the threaded channel, the screw including a head with a perimeter portion that can be rotated by a user of the cutting apparatus.

16. The cutter apparatus of claim 15 , wherein the head is shaped as a wheel.

17. The cutter apparatus of claim 14 , further including:

a spring configured for urging the two housing portions apart.