SQUARE HOLE SAW

摘要

A tool that cuts a hole for a single or double electric gang” switch” box. By having four blades, all cutting at the same time and in the shape of the switch box, a more accurate and appropriately placed hole may be provided. The hole saw may be configured with two centering drills so the tool is guided into the cut. An eccentric drive mechanism converts a rotary drive into reciprocating movement of perpendicularly opposed pairs of blades to cut a rectangular opening.

主权项

1. A rectangular hole saw, comprising:
a housing having a front face, a back face, and at least one sidewall; an eccentric drive mechanism carried within the housing operable to reciprocate a first pair of blade carriers orthogonally relative to a second pair of blade carriers, the eccentric drive mechanism comprising;
a rotary drive shaft having a driven end proximal to the back face and a driving end contained within the housing with an eccentric drive pin carried on the driving end,a first yoke having opposed linear drive ends and an elongate slot defined intermediate the opposed linear drive ends;a second yoke having opposed linear drive ends and an elongate slot defined intermediate the opposed linear drive ends, wherein the eccentric drive pin is received in the elongate slot of the first yoke and the second yoke,a first pair of blade slides reciprocably carried on a first pair of rails disposed in a substantially parallel spaced apart relation;a second pair of blade slides reciprocably carried on a second pair of rails disposed in a substantially parallel spaced apart relation orthogonal to the first pair of rails,wherein the first pair of blade slides are reciprocably moved by the linear drive ends of the first yoke and the second blade slides are reciprocably moved by the linear drive ends of the second yoke.