Return mechanism for a cyclic tool
First Claim
1. In a powered tool having a powered operative cycle followed by a reset cycle wherein a tool operating mechanism is returned to its start position, the improvement comprising a vacuum return system comprising:
- a) a cylinder having a first end thereof open to the atmosphere and the opposite second end thereof sealed from the atmosphere, b) a slidable piston within said cylinder including sealing means between said piston and the inside wall of said cylinder, said piston connected to said tool operating mechanism such that said piston is axially drawn from said second end of said cylinder toward said first end of said cylinder during said tool'"'"'s operative cycle, thereby creating a vacuum between said piston and said second end of said cylinder whereby said piston is drawn back toward said second end of said cylinder after said tool'"'"'s operative cycle is completed thereby resetting said piston and said operating mechanism to its start position c) means for preventing an accumulation of entrapped air between said piston and said second end of said cylinder.
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Accused Products
Abstract
Disclosed and taught herein is a novel vacuum return mechanism whereby the operating mechanism of a cyclic tool may be reset to its start position after having completed its operative cycle. A piston connected to the tool'"'"'s operating mechanism is caused, by action of the tool'"'"'s operating mechanism, to create a vacuum within a cylinder during the tool'"'"'s operative cycle. Upon completion of the tool'"'"'s operative cycle, the vacuum returns the piston, and thereby the tool'"'"'s operating mechanism, back to their start positions.
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Citations
9 Claims
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1. In a powered tool having a powered operative cycle followed by a reset cycle wherein a tool operating mechanism is returned to its start position, the improvement comprising a vacuum return system comprising:
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a) a cylinder having a first end thereof open to the atmosphere and the opposite second end thereof sealed from the atmosphere, b) a slidable piston within said cylinder including sealing means between said piston and the inside wall of said cylinder, said piston connected to said tool operating mechanism such that said piston is axially drawn from said second end of said cylinder toward said first end of said cylinder during said tool'"'"'s operative cycle, thereby creating a vacuum between said piston and said second end of said cylinder whereby said piston is drawn back toward said second end of said cylinder after said tool'"'"'s operative cycle is completed thereby resetting said piston and said operating mechanism to its start position c) means for preventing an accumulation of entrapped air between said piston and said second end of said cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In a tool having a powered operative cycle followed by a reset cycle wherein a tool operating mechanism is returned to its start position, the improvement including a vacuum return system comprising:
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a) a cylinder having a first end thereof open to the atmosphere and the opposite second end thereof sealed from the atmosphere, b) a slidable piston within said cylinder, c) an annular V grooved elastomeric seal between said piston and the inside wall of said cylinder wherein the open end of said V groove is directed toward said first end of said cylinder such that the outermost leg of said V groove wipes the inside wall of said cylinder thereby providing a vacuum between said piston and said second end of said cylinder as the piston translates toward said first end of said cylinder and permits the passage of entrapped air between said piston and said second end of said cylinder as said piston translates toward said second end of said cylinder, d) said piston connected to said tool operating mechanism such that said piston is axially drawn from said second end of said cylinder toward said first end of said cylinder during said tool'"'"'s operative cycle, thereby creating a vacuum between said piston and said second end of said cylinder whereby said piston is drawn back toward said second end of said cylinder after said tool'"'"'s operative cycle is completed thereby resetting said piston and said operating mechanism to its start position.
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Specification