Bushing for drill template
A bushing for a drill template, the bushing has a head portion for receipt of a drill motor. The head portion has a top surface and a bottom surface with at least one pin protruding from the bottom surface of the head portion. The pin fits within a secondary opening in a template to help retain the bushing in place. A body portion extends from the bottom surface of the head portion. The body portion has an outer surface with a portion of it threaded. The body portion extends through a primary drill hole in the template. A fastening nut having inner threads mates with the outer threads on the body portion to lock the bushing to the template. A bore extends through the head portion and the body portion for receipt of a drill bit.
1. A bushing for a drill template, said bushing comprising:
a head portion for receipt of a drill motor, said head portion having a top surface and a bottom surface;
at least one pin protruding from said bottom surface of said head portion;
a body portion extending from said bottom surface of said head portion, said body portion having an outer surface, a portion of said outer surface having outer threads;
a fastening nut having inner threads, said inner threads mating with said outer threads on said body portion;
a bore extending through said head portion and said body portion;
whereby said body portion is adapted to be inserted into a first opening formed in a template, with said at least one pin being received within a second opening formed in the template, said second opening being adjacent said first opening, said pin resisting rotation of said bushing with respect the template, said bottom surface of said head portion engaging the template, said bushing being retained within said template by threading said nut onto said external threads on said body portion.
2. The bushing of claim 1 , wherein said top surface of said head portion includes a mating surface to engage a drill head.
3. The bushing of claim 2 , wherein said a mating surface includes at least two raised locking tabs that define a recess for receipt of a drill head.
4. The bushing of claim 3 , wherein said locking tabs have inclined surfaces to engage the drill head to positively lock the drill head with respect to said locking tabs.
5. The bushing of claim 1 , wherein said outer surface of said body portion has knurling to frictionally engage with the inner diameter of a hole in a template.
6. The bushing of claim 1 , wherein said head portion and said body portion are integral.
7. A bushing and drill template comprising:
a template having at least one primary drill opening having an inner diameter and a secondary opening, said template being adapted to engage a work piece to properly and repeatedly form at least one hole in the work piece;
a bushing mounted in said at least one primary opening to protect said primary opening from drilling operations, said bushing have a head portion for receipt of a drill head, said head portion having a top surface and a bottom surface; at least one pin protruding from said bottom surface of said head portion; said at least one pin engaging said secondary opening to resist rotation of said bushing with respect to said template;
a body portion extending from said bottom surface of said head portion, said body portion having an outer surface, a portion of said outer surface having outer threads; said outer surface having an outer diameter slightly less than said inner diameter of said primary drill opening in said template, said body portion being inserted into said primary drill opening;
a fastening nut having inner threads, said inner threads mating with said outer threads on said body portion; said template having a recess coaxial with said primary opening, said recess receiving said fastening nut; said fastening nut fastening said bushing onto said template;
a bore extending through said head portion and said body portion;
whereby said template is positioned against a work piece and a drill head is engaged with said bushing head, said drill head includes a drill bit which is received within said bore, the drill bit extends through said bore and engages said work piece to form a desired hole in the work piece.
8. The bushing of claim 7 , wherein said top surface of said head portion includes a mating surface to engage a drill head.
9. The bushing of claim 8 , wherein said a mating surface includes at least two raised locking tabs that define a recess for receipt of a drill head.
10. The bushing of claim 9 , wherein said locking tabs have inclined surfaces to engage the drill head to positively lock the drill head with respect to said locking tabs.
11. The bushing of claim 7 , wherein said outer surface of said body portion has knurling to frictionally engage with the inner diameter of a hole in a template.
12. The bushing of claim 7 , wherein said head portion and said body portion are integral.