HOLE SAW MANDREL

1 . A hole saw mandrel comprising:

a tool end for connecting said hole mandrel with a drill;

a hole cutting end, connected to said tool end, including a hole saw receiver and a drill bit receiver; and

said hole saw receiver further including means for reducing or eliminating play between a hole saw and said hole saw mandrel when said hole saw is in use.

2 . The hole saw mandrel of claim 1 wherein said means for reducing or eliminating play comprises:

a pressure plate; and

a quick locking means.

3 . The hole saw mandrel of claim 2 wherein said quick locking means comprises:

a threaded portion for receiving a threaded portion of said hole saw; and

a pair of pins for mating with corresponding holes in said hole saw to lock said hole saw into place.

4 . The hole saw mandrel of claim 1 wherein said means for reducing or eliminating play comprises:

a backing plate;

whereby when said hole saw is attached to said hole saw mandrel, a back of said hole saw is placed in direct contact with said backing plate.

5 . The hole saw mandrel of claim 1 wherein said hole saw receiver comprises a collar which is independent of said central portion.

6 . The hole saw mandrel of claim 5 wherein said collar is threaded.

7 . The hole saw mandrel of claim 1 further comprising a central portion for connecting said tool end to said hole cutting end;

8 . The hole saw mandrel of claim 1 further comprising:

an ejector for ejecting a slug from said hole saw after a hole has been cut.

9 . The hole saw mandrel of claim 8 wherein said ejector further comprises:

an ejecting collar having a central hole allowing said ejecting collar to slide over said central portion; and

a set of ejecting pins, connected to said ejection collar;

wherein when said ejecting collar is moved from a non-ejection position to an ejection position, said pins pass through said hole saw to remove said slug from said hole saw.

10 . The hole saw mandrel of claim 9 wherein in said non-ejection position an end of each of said ejecting pins is located within a complimentary hole in a base of said hole saw.

11 . The hole saw mandrel of claim 9 further comprising:

a back plate; and

a spring;

said back plate and said spring located at said tool end of said hole saw mandrel causing said ejecting collar to be biased in said non-ejection position;

wherein when a hole saw is to be attached, said ejection collar may be urged away from said hole cutting end to a hole saw attachment position and then returned to said non-ejection position by said spring after said hole saw has been attached.

12 . The hole saw mandrel of claim 1 further comprising:

a hole for receiving a set screw in order to lock said drill bit into said hole saw mandrel.

13 . The hole saw mandrel of claim 1 further comprising:

release means for receiving a key to provide release of said hand saw from said hand saw mandrel without a user's hands having to touch said hole saw.

14 . The hole saw mandrel of claim 13 wherein said release means comprise:

a gear, located in said hole cutting end, for receiving said key;

said gear for translating rotational movement of said key to rotation movement for detaching said hole saw from said collar.

15 . The hole saw mandrel of claim 13 wherein said release means comprise:

a set of holes, located in said hole cutting end, for receiving said key;

whereby insertion of said key into said set of holes and rotation of said holes causes said hole saw to detach from said collar in a ratchet-like system.