Lock-out for activation arm mechanism in a power tool
First Claim
Patent Images
1. A power tool comprising:
- a structure;
a flywheel coupled to the structure;
a driver;
an activation arm assembly having a first arm, a second arm, a third arm and a roller, the third arm carrying the roller and being pivotally coupled to the second arm, the second arm being pivotally coupled to the first arm, the first arm being pivotally coupled to the structure; and
a bar coupled to the structure and movable between an extended position and a retracted position;
wherein the activation arm assembly is movable between a first position, in which the roller does not initiate frictional engagement between the flywheel and the driver, and a second position, in which the roller pushes the driver into engagement with the flywheel; and
wherein the bar contacts the activation arm assembly when the bar is positioned in the extended position to inhibit the activation arm assembly from being moved from the first position to the second position, and wherein positioning of the bar in the retracted position disengages the bar from the activation arm assembly to permit the activation arm assembly to be moved from the first position to the second position.
1 Assignment
0 Petitions
Accused Products
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 bar 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.
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Citations
22 Claims
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1. A power tool comprising:
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a structure; a flywheel coupled to the structure; a driver; an activation arm assembly having a first arm, a second arm, a third arm and a roller, the third arm carrying the roller and being pivotally coupled to the second arm, the second arm being pivotally coupled to the first arm, the first arm being pivotally coupled to the structure; and a bar coupled to the structure and movable between an extended position and a retracted position; wherein the activation arm assembly is movable between a first position, in which the roller does not initiate frictional engagement between the flywheel and the driver, and a second position, in which the roller pushes the driver into engagement with the flywheel; and wherein the bar contacts the activation arm assembly when the bar is positioned in the extended position to inhibit the activation arm assembly from being moved from the first position to the second position, and wherein positioning of the bar in the retracted position disengages the bar from the activation arm assembly to permit the activation arm assembly to be moved from the first position to 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 structure; a flywheel coupled to the structure; a driver; an activation arm assembly having a first arm, a second arm, a third arm and a roller, the third carrying the roller and being pivotally coupled to the second arm, the second arm being pivotally coupled to the first arm, the first arm being pivotally coupled to the structure; and a bar coupled to the structure and movable between an extended position and a retracted position; wherein the activation arm assembly is movable between a first position in which the roller does not initiate frictional engagement between the flywheel and the driver, and a second position, in which the roller pushes the driver into engagement with the flywheel; wherein positioning of the bar in the extended position inhibits the activation arm assembly from being moved from the first position to the second position, and wherein positioning of the bar in the retraced position permits the activation arm assembly to be moved from the first position to the second position; and wherein the bar includes a rack with a plurality of teeth that engage an edge of the first arm.
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11. A power tool comprising:
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a structure ; a flywheel coupled to the structure; a driver; an activation arm assembly having a first arm, a second arm, a third arm and a roller, the third arm carrying the roller and being pivotally coupled to the second arm, the second arm being pivotally coupled to the first arm, the first arm being pivotally coupled to the structure; a bar coupled to the structure and movable between an extended position and a retracted position; and at least one elastically deformable member that is coupled to the driver the elastically deformable member being configured to move the driver to a returned position; wherein the activation arm assembly is movable between a first position, in which the roller does not initiate frictional engagement between the flywheel and the driver, and a second position, in which the roller pushes the driver into engagement with the flywheel; wherein positioning of the bar in the extended position inhibits the activation arm assembly from the first position to the second position, and wherein positioning of the bar in the retracted position retracts the bar out of the path of the activation arm assembly to permit the activation arm assembly to be moved from the first position to the second position; and wherein the elastically deformable member is at least partially housed in a housing, the housing being coupled to the structure. - View Dependent Claims (12)
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13. A power tool comprising:
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a structure; a flywheel coupled to the structure; a driver; an activation arm assembly having a first arm, a second arm, a third arm and a roller, the third arm carrying the roller and being pivotally coupled to the second arm, the second arm being pivotally coupled to the first arm, the first arm being pivotally coupled to the structure; a bar coupled to the structure and movable between an extended position and a retracted position; an elastically deformable member that is coupled to the driver, the elastically deformable member being configured to move the driver to a returned position; and a housing coupled to the structure and partially housing the bar; wherein the activation arm assembly is movable between a first position, in which the roller does not initiate frictional engagement between the flywheel and the driver, and a second position, in which the roller pushes the driver into engagement with the flywheel; wherein the bar contacts the activation arm assembly when the bar is positioned in the extended position to inhibit the activation arm assembly from being moved from the first position to the second position, and wherein positioning of the bar in the retracted position permits the activation arm assembly to be moved from the first position to the second position; and
wherein the power tool further comprises a spring that is disposed in the housing, the spring biasing the bar toward the extended position. - View Dependent Claims (14)
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15. A power tool comprising:
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a structural backbone; a flywheel coupled to the structural backbone; a driver; an activation arm assembly having an arm and a roller that is supported by the arm, the arm being pivotally coupled to the structural backbone; a return mechanism having a housing and an elastically-deformable member that is coupled to the driver, the housing being coupled to the structural backbone, the elastically-deformable member being at least partially housed in the housing and operable for biasing the driver into a returned position; and a bar that is partially housed in the housing and movable between an extended position and a retracted position; wherein the activation arm assembly is movable between a first position, in which the roller does not initiate frictional engagement between the flywheel and the driver, and a second position, in which the roller pushes the driver into engagement with the flywheel; and wherein the bar extends into a path of the activation arm assembly when the bar is positioned in the extended position to inhibit the activation arm assembly from being moved from the first position to the second position, and wherein positioning of the bar in the second position. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A power tool comprising:
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a structural backbone; a flywheel coupled to the structural backbone; a driver; an activation arm assembly having an arm a roller that is supported by the arm, the arm being pivotally coupled to the structural backbone; a return mechanism having a housing and an elastically-deformable member that is coupled to the driver, the housing being coupled to the structural backbone, the elastically-deformable member being at least partially housed in the housing and operable for biasing the driver into a returned position; and a bar that is partially housed in the housing and movable between an extended position and a retracted position; wherein the activation arm assembly is movable between a first position, in which the roller does not initiate frictional engagement between the flywheel and the driver, and a second position, in which the roller pushes the driver into engagement with the flywheel; wherein positioning of the bar in the extended position inhibits the activation arm assembly from being moved from the first position to the second position, and wherein positioning of the bar in the retracted position permits the activation arm assembly to be moved from the first position to the second position; and wherein the bar includes a rack with a plurality of teeth that engage an edge of the arm.
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22. A power tool comprising:
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a structural backbone; a flywheel coupled to the structural backbone; a driver; an activation arm assembly having an arm and a roller that is supported by the arm, the arm being pivotally coupled to the structural backbone; a return mechanism having a housing and an elastically-deformable member that is coupled to the driver, the housing being coupled to the structural backbone, the elastically-deformable member being a least partially housed in the housing and operable for biasing the driver into a returned position; a bar that is partially housed in the housing and movable between an extended position and a retracted position; and a spring that is disposed in the housing, the spring biasing the bar toward the extended position; wherein the activation arm assembly is movable between a first position in which the roller does not initiate frictional engagement between the flywheel and the driver, and a second position, in which the roller pushes the driver into engagement with the flywheel; wherein positioning of the bar in the extended position inhibits the activation arm assembly from being moved from the first position to the second position, and wherein positioning of the bar in the retracted position permits the activation arm assembly to be moved from the first position to the second position.
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Specification