B - Operations – Transporting – 23 – D
Patent
B - Operations, Transporting
23
D
B23D 51/16 (2006.01) A01G 3/053 (2006.01) H01H 9/06 (2006.01)
Patent
CA 2475831
A drive mechanism for a power tool is disclosed, in which the power tool has a housing, a motor provided in the housing, and an output shaft adapted to be caused by the motor to execute reciprocating motion. The drive mechanism comprises a gear plate (34) adapted to rotate about a first axis (Z-Z) and having a plurality of elongate first teeth (33) extending substantially in a plane perpendicular to said first axis; and connecting means cooperating with said gear plate (34) and adapted to cause reciprocating movement of an output shaft of the tool in response to rotation of said gear plate about said first axis, wherein said reciprocating movement has a component perpendicular to said first axis. Conventional drive mechanisms which have an output shaft adapted to be caused by the motor to execute reciprocating motion generally have bevel gears with teeth formed at 45° to the axis of rotation of the gears. By providing a gear plate and connecting means which provide a reciprocating drive force for an output shaft of a power toot with teeth formed at 90° to the axis of rotation of the gear, instead of teeth formed at 45° to the axis of rotation of the gear, this provides the advantage that the gear is cheaper and easier to make as the gear teeth do not have to be formed as accurately as prior art inclined gear teeth. Also, the gear plate does not need to be as accurately located relative to the gear driving it, since some longitudinal movement in the direction of the mutually engaging teeth is possible without the gears ceasing to function correctly.
Black & Decker Inc.
Sim & Mcburney
LandOfFree
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