Reciprocating power tools

A reciprocating power tool comprising:

• a motor,
• a rotary member rotatably driven by the motor, wherein the rotary member has a rotational axis and is operable to selectively rotate in a first direction or a second direction,
• a revolving member extending from the rotary member and displaced from the rotational axis of the rotary member, wherein the revolving member revolves about the rotational axis of the rotary member when the rotary member rotates, the revolving member being arranged and constructed to move relative to the rotational axis of the rotary member so as to change the distance between the rotational axis of the rotary member and the revolving member, and
• a motion conversion mechanism coupled to the revolving member and converting the revolving movement of the revolving member into linear reciprocating movement of a working tool.

A power tool comprising:

• a motor,
• an crank disk rotatably driven by the motor, wherein the crank disk is arranged and constructed to selectively rotate in a first direction or a second direction,
• a crank pin extending from the crank disk and displaced from the rotational axis of the crank disk, whereby the crank pin revolves about the rotational axis of the crank disk as the crank disk rotates, wherein the crank pin is arranged and constructed to move relative to the crank disk so as to change the distance between the crank pin and the rotational axis of the crank disk,
• a guide roller coupled to the crank pin,
• a slider coupled to the guide roller,
• a bearing supporting linear reciprocating movement of the slider, and
• a working tool coupled to the slider.

A power tool comprising:

• a motor,
• a crank disk driven by the motor, the crank disk being rotatable in a first direction or a second direction about a rotational axis,
• a crank pin extending from the crank disk, the crank pin being displaced from and movable with respect to the rotational axis of the crank disk,
• means for changing the displacement of the crank pin with respect to the rotational axis of the crank disk from (A) a first distance when the crank disk is rotating in the first direction to (B) a second distance when the crank disk is rotating in the second direction and
• means for setting a first reciprocating stroke length of a working tool based upon the first distance and setting a second reciprocating stroke length of the working tool based upon the second distance, wherein the first reciprocating stroke length is different from the second reciprocating stroke length.