Lock-out for activation arm mechanism in a power tool
First Claim
Patent Images
1. A power tool comprising:
- a frame;
a flywheel mounted to the frame;
a nosepiece coupled to the frame;
a driver received in the nosepiece and disposed proximate the flywheel;
an activation arm assembly having a first arm, and a roller, the first arm being mounted to the frame and pivotable about a first pivot axis, the roller being coupled to the first arm and movable with the first arm between a first position and a second position in which the roller drives the driver into frictional engagement with the flywheel to transmit energy from the flywheel to the driver to cause the driver to move along a translation axis;
a contact trip coupled to the nosepiece and movable between an extended position and a retracted position; and
a stop mechanism having a wedging member and an arm, the wedging member being movable between a first wedge position and a second wedge position, the arm being configured to move the wedging member between the first and second wedge positions in response to movement of the contact trip between the extended position and the retracted position, respectively, wherein the wedging member is disposed in a rotational path of the first arm when the wedging member is positioned in the first wedge position to thereby inhibit the roller from being moved with the first arm into the second position, and wherein the wedging member is disposed out of a rotational path of the first arm when the wedging member is positioned in the second wedge position to thereby permit the roller to be moved with the first arm into the second position.
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Abstract
A power tool, such as a nailer, having a driver, a flywheel and an activation arm for selectively driving the driver into contact with the flywheel to transfer energy therebetween to cause the driver to translate. The power tool includes a wedging member that may be moved so as to resist movement of the activation arm in a direction that would bring the driver into contact with the flywheel. A method for operating a power tool is also provided.
12 Citations
21 Claims
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1. A power tool comprising:
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a frame; a flywheel mounted to the frame; a nosepiece coupled to the frame; a driver received in the nosepiece and disposed proximate the flywheel; an activation arm assembly having a first arm, and a roller, the first arm being mounted to the frame and pivotable about a first pivot axis, the roller being coupled to the first arm and movable with the first arm between a first position and a second position in which the roller drives the driver into frictional engagement with the flywheel to transmit energy from the flywheel to the driver to cause the driver to move along a translation axis; a contact trip coupled to the nosepiece and movable between an extended position and a retracted position; and a stop mechanism having a wedging member and an arm, the wedging member being movable between a first wedge position and a second wedge position, the arm being configured to move the wedging member between the first and second wedge positions in response to movement of the contact trip between the extended position and the retracted position, respectively, wherein the wedging member is disposed in a rotational path of the first arm when the wedging member is positioned in the first wedge position to thereby inhibit the roller from being moved with the first arm into the second position, and wherein the wedging member is disposed out of a rotational path of the first arm when the wedging member is positioned in the second wedge position to thereby permit the roller to be moved with the first arm into the second position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power tool comprising:
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a frame; a flywheel mounted to the frame; a nosepiece coupled to the frame; a driver received in the nosepiece and disposed proximate the flywheel; an activation arm assembly having a first arm, and a roller, the first arm being mounted to the frame and pivotable about a first pivot axis, the roller being coupled to the first arm and movable with the first arm between a first position and a second position in which the roller drives the driver into frictional engagement with the flywheel to transmit energy from the flywheel to the driver to cause the driver to move along a translation axis; a contact trip coupled to the nosepiece and movable between an extended position and a retracted position; and a stop mechanism having an arm, a wedging member and a spring, the arm being coupled for translation with the contact trip, the wedging member being translatable between a first wedging position in which the wedging member is disposed in a rotational path of the first arm to thereby prevent the roller from being moved with the first arm into the second position, and a second wedging position in which the wedging member is disposed out of the rotational path of the first arm to thereby permit the roller to be moved with the first arm into the second position, the spring biasing the wedging member toward the first position. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method for operating a power tool having a flywheel, a driver, an arm that carries a roller and a contact trip, the arm being movable between a first position in which the roller does not drive the driver into engagement with the flywheel, and a second position in which the roller drives the driver into engagement with the flywheel to permit the flywheel to transfer energy to the driver and translate the driver along a translation axis, the contact trip being movable between an extended position and a retracted position, the method comprising:
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providing a bar that is movable between a first wedging position, in which the bar is disposed in a rotational path of the arm to inhibit movement of the arm from the first position to the second position, and a second wedging position, in which the bar is disposed out of a rotational path of the arm to permit movement of the arm from the first position to the second position; biasing the bar into the first wedging position; and moving the bar into the second wedging position in response to a predetermined event. - View Dependent Claims (19, 20)
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21. A power tool comprising:
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a frame; a flywheel mounted to the frame; a nosepiece coupled to the frame; a driver received in the nosepiece and disposed proximate the flywheel; an activation arm assembly having a first arm, and a roller, the first arm being mounted to the frame and pivotable about a first pivot axis, the roller being coupled to the first arm and movable with the first arm between a first position and a second position in which the roller drives the driver into frictional engagement with the flywheel to transmit energy from the flywheel to the driver to cause the driver to move along a translation axis; a contact trip coupled to the nosepiece and movable between an extended position and a retracted position; and a stop mechanism having an arm, a wedging member and a spring, the arm being coupled for translation with the contact trip, the wedging member being translatable between a first wedging position in which the wedging member is disposed in a rotational path of the first arm to thereby prevent the roller from being moved with the first arm into the second position, and a second wedging position in which the wedging member is disposed out of the rotational path of the first arm to thereby permit the roller to be moved with the first arm into the second position, the spring biasing the wedging member toward the first position; wherein the wedging member includes a plurality of rack teeth that engage the first arm when the wedging member is positioned in the first wedge position, wherein the first arm includes a pair of longitudinally extending arm members and a lateral member that extends between the pair of longitudinally extending arm members and wherein the rack teeth contact the lateral member when the wedging member is engaged to the first arm, wherein the stop mechanism further includes a housing into which the spring and the wedging member are received, the housing being removably coupled to the frame, wherein the power tool further comprises a means for returning the driver to a returned position and wherein the returning means is at least partially housed in the housing, and wherein the roller is mounted on a pair of eccentrics and wherein the eccentrics are mounted on a second arm that is pivotally mounted to the first arm about a second pivot axis, and wherein the first and second pivot axes are spaced apart.
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Specification