Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support – Movable relative to tool along tool-axis
Patent
1988-06-22
1989-06-06
Bishop, Steven C.
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
Movable relative to tool along tool-axis
248601, 403166, 403377, 408 16, 408 75, 408115R, 408241S, B23B 4514
Patent
active
048367206
ABSTRACT:
A hand drill guide comprising an annular base and a plurality of telescopic leg assemblies distributed along the base. Each assembly has a hollow cylinder, fixed perpendicularly at one end to the base, and a rod slidably mounted in the cylinder, the rod extending out of the cylinder through an opening. The drill guide also comprises an annular positioning head to which the other ends of the rods are fixed, and an annular drill holding assembly mounted for selective location on the cylinders. The rod has a retaining ring rigidly connected thereto at a given distance from its upper end to prevent the rod from escaping from the cylinder. A ring is floatingly mounted on the upper portion of the rod inside the cylinder and two springs act on the floating ring: one between it and the upper end of the cylinder and the other between it and the retaining ring, both springs being uncompressed when the retaining ring is adjacent to the bottom end of the cylinder. A stiffening annular member preferably interconnect the cylinders at their open ends. In addition, the positioning head is preferably provided with a manually operable finger which can be moved to show where the center of the drill guide is located, that is where the hole is to be drilled.
REFERENCES:
patent: 2389314 (1945-11-01), Imhof et al.
patent: 2674906 (1954-04-01), Timpner
patent: 2997900 (1961-08-01), Pugsley
patent: 4179231 (1979-12-01), Hadden
patent: 4349301 (1982-09-01), Boyajian
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