Cutlery – Cutting tools – Saw
Patent
1989-04-07
1990-10-16
Watts, Douglas D.
Cutlery
Cutting tools
Saw
30393, B27B 1100
Patent
active
049625888
ABSTRACT:
A portable reciprocating saw includes a tool housing, an electric motor enclosed in the tool housing and having an output shaft, an elongated slider for supporting a saw blade, and motion converting means mounted in the tool housing for converting the rotation from the electric motor into a reciprocating motion of the slider in longitudinal direction. The motion converting means includes a bevel gear meshing with the ouptut shaft of the electric motor and rotatable about an axis inclined to a plane transverse to the longitudinal direction of the slider, a slider block mounted on the slider and having a guide groove formed on a lower surface thereof in a direction transverse to the longitudinal direction of the slider, and an eccentric pin mounted on the bevel gear at a position eccentric from the center of the bevel gear and loosely fitted in the guide groove of the slider block. With this arrangement, during operation of the electric motor, the slider performs a composite orbital motion including a reciprocating motion in longitudinal direction and a pivotal motion about a pivot axis extending transverse to the longitudinal direction.
REFERENCES:
patent: 4385443 (1983-05-01), O'Banion
patent: 4676001 (1987-06-01), Wagner
Fushiya Fusao
Shibata Mitsuyoshi
Yamazaki Takashi
Makita Electric Works Ltd.
Watts Douglas D.
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