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Return mechanism for a cyclic tool

  • US 6,755,336 B2
  • Filed: 12/20/2001
  • Issued: 06/29/2004
  • Est. Priority Date: 12/22/2000
  • Status: Expired due to Term
First Claim
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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:

  • 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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