Adjustable stroke mechanism for a scotch yoke assembly
AssigneeS-B Power Tool Company
InventorsMartin Feldmann, Vance E. Roe
Life of this patent
Estimating the term…
Abstract
A scotch yoke mechanism for converting rotational movement into reciprocating linear movement and having an adjustable stroke length. The scotch yoke mechanism includes a stroke length toggle eccentrically connected to a cam such that the stroke length toggle may assume one of first and second positions. The first position defines a first stroke length which is shorter than a second stroke length defined by said second position. Rotational movement of the cam causes the stroke length toggle to assume the first position when the cam is rotated in a first direction to assume the second position when the cam is rotated in a second direction opposite the first direction.
Claims13
A scotch yoke mechanism for a reciprocating saw including a reversible rotary motor which is rotatable in both first and second directions, the second direction being opposite to the first direction, the reciprocating saw further including a saw blade operably connected to the motor such that rotational movement of the motor is converted into linear movement of the saw blade, said scotch yoke mechanism comprising:
- a cam operably connected to and receiving rotational force from the motor, and
- a stroke length toggle eccentrically connected to said cam, said stroke length toggle being adjustable between a first position and a second position, said stroke length toggle being operably connected to the saw blade;
- wherein rotation of said cam in said first direction causes said stroke length toggle to assume said first position which defines a first stroke length;
- wherein rotation of said cam in said second direction causes said stroke length toggle to assume said second position which defines a second stroke length;
- said first stroke length being different than said second stroke length.
A reciprocating saw for linearly driving a saw blade at one of first and second stroke lengths in accordance with a rotational direction of a reversible rotary motor, said reciprocating saw comprising:
- a housing adapted to receive the reversible rotary motor;
- an output shaft operably connected to and rotationally driven in one of a first and a second directions by the reversible rotary motor;
- a rotatable cam operably connected to and receiving rotational force from said output shaft;
- and,
- a stroke length toggle eccentrically connected to said cam, said stroke length toggle being adjustable between a first position and a second position, said stroke length toggle being operably connected to the saw blade;
- wherein rotation of said cam in said first direction causes said stroke length toggle to assume said first position which defines a first stroke length;
- wherein rotation of said cam in said second direction causes said stroke length toggle to assume said second position which defines a second stroke length;
- said first stroke length being different than said second stroke length.
A reciprocating saw comprising:
- a housing adapted to receive the reversible rotary motor;
- an output shaft operably connected to and rotationally driven in one of a first and a second directions by the reversible rotary motor;
- a rotatable cam operably connected to and receiving rotational force from said output shaft;
- and
- a stroke length toggle eccentrically connected to said cam, said stroke length toggle being adjustable between a first position and a second position, said stroke length toggle being operably connected to the saw blade;
- first and second stop pins mounted to said upper surface of said cam;
- wherein rotation of said cam in said first direction causes said stroke length toggle to assume said first position which defines a first stroke length;
- wherein rotation of said cam in said second direction causes said stroke length toggle to assume said second position which defines a second stroke length;
- said first stroke length being different than said second stroke length;
- wherein said first pin defines a maximum displacement of said stroke length toggle in said first direction and said second pin defines a maximum displacement of said stroke length toggle in said second direction, wherein positioning of said first and second pins determines said first and second stroke lengths.
Dependencies are inferred from the claim text.