Cam and clutch configuration for a power tool
First Claim
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1. A power tool comprising:
- a flywheel;
an activation arm having a first arm, a second arm pivotally mounted to the first arm, and a roller that is coupled to the second arm;
a driver disposed between the roller and the flywheel;
a cam that is movable in a predetermined direction for causing the activation arm to rotate about a pivot to drive the roller against the driver so that the driver frictionally engages the flywheel; and
a clutch that cooperates with the cam to inhibit the cam from moving in a direction opposite the predetermined direction in response to a reaction force that is applied by the driver onto the activation arm.
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Abstract
A power tool with a flywheel, an activation arm, a driver, a cam and a clutch. The activation arm can have a first arm, a second arm, which can be pivotally mounted to the first arm, and a roller that can be coupled to the second arm. The driver can be disposed between the roller and the flywheel. The cam can be moveable in a predetermined direction for causing the activation arm to rotate about a pivot to drive the roller against the driver so that the driver frictionally engages the flywheel. The clutch can cooperate with the cam to inhibit the cam from moving in a direction opposite the predetermined direction in response to a reaction force that is applied by the driver onto the activation arm.
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Citations
24 Claims
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1. A power tool comprising:
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a flywheel; an activation arm having a first arm, a second arm pivotally mounted to the first arm, and a roller that is coupled to the second arm; a driver disposed between the roller and the flywheel; a cam that is movable in a predetermined direction for causing the activation arm to rotate about a pivot to drive the roller against the driver so that the driver frictionally engages the flywheel; and a clutch that cooperates with the cam to inhibit the cam from moving in a direction opposite the predetermined direction in response to a reaction force that is applied by the driver onto the activation arm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A power tool comprising:
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a structural backbone; a flywheel mounted on the structural backbone; an activation arm having a first arm, a second arm and a roller, the first arm being coupled to a follower, the second arm being pivotally mounted to the first arm, the roller being coupled to the second arm; a pivot pivotally coupling the first arm to the structural backbone; a driver disposed between the roller and the flywheel and movable along a translation axis between a retracted position and an extended position; a cam having a cam surface that is engagable to the follower; an actuator with a body and a member that is movable relative to the body along an actuation axis, the body being coupled to the structural backbone, the member being coupled to the cam such that the cam is movable along the actuation axis in a first direction and a second direction that is opposite the first direction; and a ground plate coupled to the structural backbone; wherein actuation of the power tool is at least partially accomplished through movement of the member in the first direction such that the cam surface contacts the follower and pivots the first arm about the pivot pin and the roller engages the driver against the flywheel to thereby transfer energy from the flywheel to the driver, and wherein a reaction force applied to the activation arm drives the cam into locking frictional engagement with the ground plate to thereby resist movement of the cam in the second direction. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification