Tool driving or impacting – Drive controlled by relative axial movement of tool – Drive motor controlled
Patent
1994-10-31
1996-07-09
Smith, Scott A.
Tool driving or impacting
Drive controlled by relative axial movement of tool
Drive motor controlled
173 13, 173212, 1731622, E21B 500
Patent
active
055335799
ABSTRACT:
A pneumatic tool includes: a main cylinder having an operating lever for on-off control for the supply of compressed air into the pneumatic tool, a barrel member resiliently coupled to the main cylinder and having a tool unit secured at its front end portion, and an automatically closed throttle valve held in the main cylinder, whereby upon touching on a working object when starting the pounding job, the barrel member will be retracted to open the throttle valve for performing the pneumatic operation by the pneumatic tool; and when subjected to no load condition, the throttle valve will be restored and closed automatically to temporarily stop the pounding of the pneumatic tool to minimize vibration hazard, and an air cushion is inherently formed between the barrel member and the main cylinder for dampening or absorbing the vibration shock of the pneumatic tool.
REFERENCES:
patent: 2899934 (1959-08-01), Salengro
patent: 3223181 (1965-12-01), Price
patent: 3250334 (1966-05-01), Sussman
patent: 3446291 (1969-05-01), Judd et al.
patent: 3599730 (1971-08-01), Luthman
patent: 3924690 (1975-12-01), Shaw
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