Adjustable stroke length, reciprocating tools

Details Adjustable stroke length, reciprocating tools Adjustable stroke length, reciprocating tools

1975-09-15

1977-06-28

Scott, Samuel

Machine element or mechanism

Mechanical movements

Rotary to or from reciprocating or oscillating

F16H 2118

Patent

active

040317633

ABSTRACT:
This invention is drawn to reciprocating power tools. It is often desirable in reciprocating power tools to be able to adjust the length of the stroke of the tool member. The invention disclosed herein comprises an inexpensive device for performing this function. In effect, a screw adjustment member having a hand knob is mounted in the tool housing and when rotated changes the position of one end of a simple lever. The other end of the lever bears against a rotating member which is mounted on the power output shaft of the tool. As this movable rotating member is adjusted, it causes a second simple lever to rotate, changing the position of the arm of the reciprocating mechanism with respect to the shaft of the power drive means. Thus, as the knob on the screw adjustment member is rotated, the swing arm length of the eccentric driven by the power source may be varied.

REFERENCES:
patent: 2307174 (1943-01-01), Wachs
patent: 2839935 (1958-06-01), Hartzell et al.
patent: 2960879 (1960-11-01), Lafitte
Strasser-Rotary-Linear Motion-Product Engineering, Mar. 9, 1959, p. 65.

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