Counterbalanced reciprocating mechanism
AssigneeMilwaukee Electric Tool Corporation
InventorBernhard Palm
Life of this patent
Estimating the term…
Abstract
The motor drives the crown gear which has an upwardly projecting eccentric drive pin which drivingly engages the channel fixed on the spindle which reciprocates in the fixed tube and supports a saw blade. The induced vibration is counterbalanced by the reciprocating counterbalance which slides on the outside of the tube. The crown gear has a cylindrical drive member which engages the cylindrical hole in the transfer block. The transfer block is moved in an orbital path and the opposed parallel sides engage and reciprocate the counterweight. The crown gear and cylindrical drive member have material removed to counterbalance the two drives.
Claims16
A reciprocating drive mechanism comprising,
- a housing,
- a spindle mounted in said housing for reciprocating motion,
- a counterweight mounted in said housing coaxial with said spindle and moveable relative to said spindle,
- eccentric drive means for reciprocating said spindle,
- eccentric drive means for reciprocating said counterweight in the direction opposite the direction of said spindle so the axial forces induced by reciprocation of the spindle are substantially cancelled, with by means counterbalancing said drive means.
A reciprocating drive mechanism comprising,
- a housing,
- a spindle mounted in said housing for reciprocating motion,
- a counterweight mounted in said housing for reciprocating motion relative to said spindle,
- said spindle and said counterweight being concentric, and
- first eccentric drive means for reciprocating said spindle and second eccentric drive means for reciprocating said counterweight in opposite directions so the axial forces induced by reciprocation are substantially cancelled.
A reciprocating drive mechanism comprising,
- a housing,
- a drive motor in said housing,
- a spindle mounted in said housing for reciprocating motion,
- a counterweight mounted in said housing for reciprocating motion parallel to and concentric with said spindle,
- first and second eccentric drive means driven by said motor and connected to said spindle and said counterweight respectively,
- said drive means being operative to reciprocate said spindle and said counterweight in opposite directions.
A reciprocating saw comprising,
- a housing including a gear case,
- a motor in said housing and having a motor shaft,
- a pinion gear on said shaft,
- a crown gear mounted in said housing and driven by said pinion gear,
- a spindle mounted in said gear case for reciprocating motion,
- a counterweight mounted in said case for reciprocating motion parallel to and concentric with said spindle,
- primary and secondary eccentric drive means mounted on said crown gear and connected to said spindle and said counterweight respectively,
- said primary and secondary drive means operating to reciprocate said spindle and said counterweight in opposite directions.
A reciprocating saw comprising,
- a housing including a gear case,
- a motor in said housing and having a motor shaft,
- a crown gear rotatably mounted in said housing and driven by said motor shaft,
- a spindle mounted in said gear case for reciprocating motion,
- first eccentric drive means connecting said crown gear to said spindle to reciprocate said spindle as said crown gear is rotated,
- a counterweight mounted in said gear case for reciprocating motion parallel to and concentric with said spindle axis,
- a second eccentric drive means connecting said crown gear to said counterweight,
- said first and second eccentric drive means being offset with respect to each other so the forces induced by reciprocation of the spindle is counterbalanced by the counterweight.
Dependencies are inferred from the claim text.