Power hand tool with improved oscillating eccentric and fork mechanism
First Claim
Patent Images
1. A power tool comprising:
- a motor including a drive shaft that is rotatable about a central longitudinal axis of the drive shaft;
an eccentric pin attached to the drive shaft such that (a) an angle between a central longitudinal axis of the eccentric pin and the central longitudinal axis of the drive shaft is oblique and (b) the rotation of the drive shaft causes rotation of the eccentric pin about the central longitudinal axis of the drive shaft;
a bearing attached to the eccentric pin; and
a fork that includes arms and in which the bearing is arranged such that the rotation of the eccentric pin about the central longitudinal axis of the drive shaft causes the fork to rotate about an axis that is non-parallel to the central longitudinal axis of the drive shaft, wherein the eccentric pin and the fork are arranged relative to each other such that an angle of between (a) the central longitudinal axis of the eccentric pin and (b) a central longitudinal axis of the fork remains fixed throughout the rotations of the eccentric pin and of the fork;
wherein at least one of;
the fork includes a fork member that includes a hollow tubular structure; and
the power tool further comprises an output spindle (a) that includes a pivot connection that includes at least one axle that protrudes outwardly from the output spindle, and (b) to which the fork is rotatably connected for rotation of the fork about a fork rotation axis that is perpendicular (1) to the central longitudinal axis of the drive shaft and (2) to the axis that is non-parallel to the central longitudinal axis of the drive shaft.
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Abstract
An oscillating power tool includes a drive motor producing rotary motion and an oscillating mechanism for converting the motor rotary motion to an oscillatory side-to-side movement. The oscillating mechanism includes a fork having two arms and coupled to an output spindle and includes a bearing positioned between the two arms of the fork and coupled to the drive motor. The arrangement of the fork and the bearing isolate relative rotation and translation between the components of the tool while still imparting an oscillatory motion to the output spindle.
34 Citations
20 Claims
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1. A power tool comprising:
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a motor including a drive shaft that is rotatable about a central longitudinal axis of the drive shaft; an eccentric pin attached to the drive shaft such that (a) an angle between a central longitudinal axis of the eccentric pin and the central longitudinal axis of the drive shaft is oblique and (b) the rotation of the drive shaft causes rotation of the eccentric pin about the central longitudinal axis of the drive shaft; a bearing attached to the eccentric pin; and a fork that includes arms and in which the bearing is arranged such that the rotation of the eccentric pin about the central longitudinal axis of the drive shaft causes the fork to rotate about an axis that is non-parallel to the central longitudinal axis of the drive shaft, wherein the eccentric pin and the fork are arranged relative to each other such that an angle of between (a) the central longitudinal axis of the eccentric pin and (b) a central longitudinal axis of the fork remains fixed throughout the rotations of the eccentric pin and of the fork;
wherein at least one of;
the fork includes a fork member that includes a hollow tubular structure; and
the power tool further comprises an output spindle (a) that includes a pivot connection that includes at least one axle that protrudes outwardly from the output spindle, and (b) to which the fork is rotatably connected for rotation of the fork about a fork rotation axis that is perpendicular (1) to the central longitudinal axis of the drive shaft and (2) to the axis that is non-parallel to the central longitudinal axis of the drive shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 19, 20)
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9. A power tool comprising:
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a motor including a drive shaft that is rotatable about a central longitudinal axis of the drive shaft; an eccentric pin attached to the drive shaft such that (a) an angle between a central longitudinal axis of the eccentric pin and the central longitudinal axis of the drive shaft is oblique and (b) the rotation of the drive shaft causes rotation of the eccentric pin about the central longitudinal axis of the drive shaft; a bearing attached to the eccentric pin; a fork that includes arms and in which the bearing is arranged such that the rotation of the eccentric pin about the central longitudinal axis of the drive shaft causes the fork to rotate about a first fork rotation axis that is perpendicular to the central longitudinal axis of the drive shaft; and an output spindle to which the fork is rotatably connected for rotation of the fork about a second fork rotation axis that is perpendicular to the first fork rotation axis and that is perpendicular to the central longitudinal axis of the drive shaft;
wherein at least one of;
the fork includes a fork member that includes a hollow tubular structure; and
the output spindle includes a pivot connection that includes at least one axle that protrudes outwardly from the output spindle. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification