초록 ▼

A reciprocating saw generally includes a housing and a motor supported by the housing. A spindle is mounted for reciprocation relative to the housing, the spindle having a front end for supporting a saw blade and being movable through a cutting stroke and a return stroke, and the cutting stroke may

A reciprocating saw generally includes a housing and a motor supported by the housing. A spindle is mounted for reciprocation relative to the housing, the spindle having a front end for supporting a saw blade and being movable through a cutting stroke and a return stroke, and the cutting stroke may have a stroke length. A rotary member may be supported for rotation about a rotary axis. The saw may further include an adjusting assembly operable to adjust the stroke length of the spindle. Also, the saw may include a counterweight supported for movement relative to the housing, a movement of the counterweight substantially balancing at least a portion of movement of the spindle, and an adjusting assembly operable to adjust the movement of the counterweight.

대표청구항 ▼

We claim: 1. A reciprocating saw comprising: a housing; a motor supported by the housing; a spindle supported for reciprocation relative to the housing, the spindle having a front end for supporting a saw blade and being movable through a cutting stroke and a return stroke, the cutting stroke and t

We claim: 1. A reciprocating saw comprising: a housing; a motor supported by the housing; a spindle supported for reciprocation relative to the housing, the spindle having a front end for supporting a saw blade and being movable through a cutting stroke and a return stroke, the cutting stroke and the return stroke having a stroke length; a spindle drive mechanism connected between the motor and the spindle and operable to reciprocate the spindle; a counterweight supported for movement relative to the housing, a movement of the counterweight in a direction substantially opposite a movement of the spindle substantially balancing at least a portion of the movement of the spindle; a counterweight drive mechanism operable to move the counterweight relative to the housing; and an adjustment assembly having an actuator extending outwardly through the housing and being operable to adjust an extent of movement of the counterweight relative to the housing in response to adjusting the stroke length of the spindle. 2. The reciprocating saw of claim 1, wherein the counterweight has a range of movement relative to the housing, and wherein the adjustment assembly is operable to adjust the range of movement of the counterweight relative to the housing. 3. The reciprocating saw of claim 2, wherein the counterweight has a stroke length defining the range of movement, and wherein the adjustment assembly is operable to adjust the stroke length of the counterweight. 4. The reciprocating saw of claim 3, wherein, in a first condition of the adjustment assembly, the counterweight has a first stroke length, and wherein, in a second condition of the adjustment assembly, the counterweight has a second stroke length, the second stroke length being different than the first stroke length. 5. The reciprocating saw of claim 3, wherein the counterweight has a center of mass, the center of mass being movable relative to the housing between a first position and a second position, a distance between the first position and the second position being the stroke length of the counterweight. 6. The reciprocating saw of claim 5, wherein the adjustment assembly is operable to adjust the distance between the first position and the second position. 7. The reciprocating saw of claim 1, wherein the counterweight drive mechanism includes a rotary member supported for rotation relative to the housing and drivable by the motor, and a drive arm connected between the rotary member and the counterweight, rotation of the rotary member causing the drive arm to move the counterweight relative to the housing. 8. The reciprocating saw of claim 7, wherein the rotary member is rotatable about a rotary axis, and wherein the drive arm is connected to the rotary member along an eccentric axis offset from the rotary axis. 9. The reciprocating saw of claim 7, wherein the spindle drive mechanism includes the rotary member and a spindle drive arm connected between the rotary member and the spindle, rotation of the rotary member causing the spindle drive arm to reciprocate the spindle. 10. The reciprocating saw of claim 1, wherein the spindle has a stroke length relative to the housing, and wherein said reciprocating saw further comprises a spindle adjustment assembly operable to adjust the stroke length of the spindle. 11. The reciprocating saw of claim 10, wherein the adjustment assembly provides at least a portion of the spindle adjustment assembly. 12. A reciprocating saw comprising: a housing; a motor supported by the housing; a spindle supported for reciprocation relative to the housing, the spindle having a front end for supporting a saw blade and being movable through a cutting stroke and a return stroke, the cutting stroke having a stroke length; a spindle drive mechanism connected between the motor and the spindle and operable to reciprocate the spindle; a spindle adjustment assembly operable to adjust the stroke length of the spindle; a counterweight supported for movement relative to the housing, a movement of the counterweight in a direction substantially opposite a movement of the spindle substantially balancing at least a portion of the movement of the spindle; a counterweight drive mechanism operable to move the counterweight relative to the housing; and a counterweight adjustment assembly having an actuator extending outwardly through the housing and being operable to adjust an extent of the movement of the counterweight relative to the housing in response to adjusting the stroke length of the spindle. 13. The reciprocating saw of claim 12, wherein the spindle adjustment assembly provides at least a portion of the counterweight adjustment assembly. 14. The reciprocating saw of claim 12, wherein the counterweight adjustment assembly provides at least a portion of the spindle adjustment assembly. 15. The reciprocating saw of claim 12, wherein the spindle drive mechanism provides at least a portion of the counterweight drive mechanism. 16. The reciprocating saw of claim 12, wherein the counterweight drive mechanism provides at least a portion of the spindle drive mechanism. 17. The reciprocating saw of claim 16, wherein the counterweight drive mechanism includes a rotary member supported for rotation relative to the housing and drivable by the motor, and a drive arm connected between the rotary member and the counterweight, rotation of the rotary member causing the drive arm to move the counterweight relative to the housing. 18. The reciprocating saw of claim 17, wherein the spindle drive mechanism includes the rotary member and a spindle drive arm connected between the rotary member and the spindle, rotation of the rotary member causing the spindle drive arm to reciprocate the spindle. 19. A reciprocating saw comprising: a housing; a motor supported by the housing; a spindle mounted for reciprocation relative to the housing, the spindle having a front end for supporting a saw blade and being movable through a cutting stroke and a return stroke, the cutting stroke having a stroke length; a rotary member supported for rotation about a rotary axis; an adjusting assembly adjustably connected with the rotary member, the adjusting assembly defining an eccentric axis at a position relative to the rotary axis, the position of the eccentric axis being adjustable relative to the rotary axis to adjust the stroke length of the spindle; an arm member having a drive end connected to the rotary member along the eccentric axis and a spindle end connected to the spindle; and a bearing connected to the drive end of the arm member, the bearing having an inner race and an outer race, the outer race being connected to the arm member, the eccentric axis intersecting the inner race. 20. The reciprocating saw of claim 19, wherein the arm member is pivotally connected to the rotary member. 21. The reciprocating saw of claim 19, wherein the eccentric axis is parallel to the rotary axis and spaced a distance from the rotary axis, the distance being adjustable between a first distance and a second distance. 22. The reciprocating saw of claim 19, further comprising a counterweight assembly supported for movement during reciprocation of the spindle to substantially balance at least the spindle. 23. The reciprocating saw of claim 22, wherein the counterweight has a counterweight stroke length, and wherein said reciprocating saw further comprises a counterweight adjustment assembly operable to adjust the counterweight stroke length. 24. The reciprocating saw of claim 23, wherein the counterweight has a center of mass, the counterweight stroke length being defined between a first position of the center of mass and a second position of the center of mass. 25. A reciprocating saw comprising: a housing; a motor supported by the housing; a spindle mounted for reciprocation relative to the housing, the spindle having a front end for supporting a saw blade and being movable through a cutting stroke and a return stroke, the cutting stroke having a stroke length; a rotary member supported for rotation about a rotary axis; an adjusting assembly adjustably connected with the rotary member, the adjusting assembly defining an eccentric axis at a position relative to the rotary axis, the position of the eccentric axis being adjustable relative to the rotary axis to adjust the stroke length of the spindle; and an arm member having a drive end connected to the rotary member along the eccentric axis and a spindle end connected to the spindle; wherein the adjusting assembly further includes an arcuate gear having a center axis, the center axis being coincident with the eccentric axis, the arcuate gear movably engaging the rotary member. 26. The reciprocating saw of claim 25, further comprising a fastener disposed along the eccentric axis, the fastener fixedly connecting the arcuate gear to the drive end of the arm member, the fastener pivotally connecting the arcuate gear to the rotary member. 27. the reciprocating saw of claim 25, wherein the adjusting assembly further includes an actuator operatively engaged with the arcuate gear and selectively engageable with the rotary member, wherein, when the actuator is engaged with the rotary member, the stroke length is fixed and, when the actuator is disengaged from the rotary member, adjustment of the actuator adjusts the stroke length of the spindle. 28. A reciprocating saw comprising: a housing; a motor supported by the housing; a spindle mounted for reciprocation relative to the housing, the spindle having a front end for supporting a saw blade and being movable through a cutting stroke and a return stroke, the cutting stroke having a stroke length; a rotary member supported for rotation about a rotary axis; an adjusting assembly adjustably connected with the rotary member, the adjusting assembly defining an eccentric axis at a position relative to the rotary axis, the position of the eccentric axis being adjustable relative to the rotary axis to adjust the stroke length of the spindle; and an arm member having a drive end connected to the rotary member along the eccentric axis and a spindle end connected to the spindle; wherein the rotary member further includes a drive element connected to a drive shaft, and an adjusting element connected to the drive shaft. 29. The reciprocating caw of claim 28, wherein the drive element is a gear rotatable about the rotary axis. 30. The reciprocating saw of claim 28, wherein the adjusting element is a gear fixed to the drive shaft. 31. A reciprocating device comprising: a housing; a motor supported by the housing; a spindle supported for reciprocation relative to the housing, the spindle having a front end for supporting a saw blade and being movable through a cutting stroke and a return stroke, the cutting stroke and the return stroke having a stroke length; a spindle drive mechanism connected between the motor and the spindle and operable to reciprocate the spindle; a counterweight supported for movement relative to the housing, a movement of the counterweight in a direction substantially opposite a movement of the spindle substantially balancing at least a portion of the movement of the spindle; a counterweight drive mechanism operable to move the counterweight relative to the housing; and an adjustment assembly having an actuator extending outwardly through the housing and being operable to adjust an extent of movement of the counterweight relative to the housing in response to adjusting the stroke length of the spindle. 32. the reciprocating device of claim 31, wherein the counterweight has a range of movement relative to the housing, and wherein the adjustment assembly is operable to adjust the range of movement of the counterweight relative to the housing. 33. The reciprocating device of claim 32, wherein the counterweight has a stroke length defining the range of movement, and wherein the adjustment assembly is operable to adjust the stroke length of the counterweight. 34. the reciprocating device of claim 33, wherein the counterweight has a center of mass, the center of mass being movable relative to the housing between a first position and a second position, a distance between the first position and the second position being the stroke length of the counterweight. 35. the reciprocating device of claim 34, wherein the adjustment assembly is operable to adjust the distance between the first position and the second position. 36. The reciprocating device of claim 32, wherein, in a first condition of the adjustment assembly, the counterweight has a first stroke length, and wherein, in a second condition of the adjustment assembly, the counterweight has a second stroke length, the second stroke length being different than the first stroke length. 37. The reciprocating device of claim 31, wherein the counterweight drive mechanism includes a rotary member supported for rotation relative to the housing and drivable by the motor, and a drive arm connected between the rotary member and the counterweight, rotation of the rotary member causing the drive arm to move the counterweight relative to the housing. 38. The reciprocating device of claim 37, wherein the rotary member is rotatable about a rotary axis, and wherein the drive arm is connected to the rotary member along an eccentric axis offset from the rotary axis. 39. The reciprocating device of claim 37, wherein the spindle drive mechanism includes the rotary member and a spindle drive arm connected between the rotary member and the spindle, rotation of the rotary member causing the spindle drive arm to reciprocate the spindle. 40. The reciprocating device of claim 31, wherein the spindle has a stroke length relative to the housing, and wherein said reciprocating device further comprises a spindle adjustment assembly operable to adjust the stroke length of the spindle. 41. the reciprocating device of claim 40, wherein the adjustment assembly provides at least a portion of the spindle adjustment assembly.