Tool driving or impacting – Impacting devices – With anvil arranged to transmit torsional impact to tool
Patent
1996-04-22
1997-05-06
Smith, Scott A.
Tool driving or impacting
Impacting devices
With anvil arranged to transmit torsional impact to tool
173 935, 173177, B25B 702, B25B 2314
Patent
active
056261985
ABSTRACT:
A pneumatically powered torque impulse delivering tool for screw joint tightening comprises a housing (10) with a forward impulse chamber (11) enclosing a hydraulic impulse generator (15), a motor chamber (12) disposed rearwardly of the impulse chamber (11) and including a vane type air motor (19), and air inlet and outlet passages (26, 27) located at the rear end of the housing (10). The motor cylinder (20) is provided with radial air communication openings (37a,b, 38a,b, 39a,b) and outer grooves (37c,d, 38c,d, 39c,d) forming passages for connecting the openings (37a,b, 38a,b, 39a,b) to the air inlet and outlet passages (26, 27). Two pairs of openings (37a,b, 38a,b) are alternatively connected to the air inlet and outlet openings (26, 27) via rearwardly extending grooves (37c,d, 38c,d) and a reverse valve (31), whereas a third pair of openings (39a,b) permanently act as outlet openings and communicate with the impulse chamber (11) via forwardly extending grooves (39c,d), and at least one groove (41a,b) extending over the entire length of the cylinder (20) without coinciding with any one of the air communication openings (37a,b, 38a,b, 39a,b) and arranged to connect the impulse chamber (11) to the outlet passage (27).
REFERENCES:
patent: 3253662 (1966-05-01), Sacchini
patent: 3315754 (1967-04-01), Holdo et al.
patent: 3323395 (1967-06-01), Burnett et al.
patent: 3608649 (1971-09-01), Roggenburk
patent: 4120604 (1978-10-01), Garofalo
patent: 4418764 (1983-12-01), Mizobe
patent: 4838133 (1989-06-01), Dainin
patent: 4844176 (1989-07-01), Podsobinski
patent: 5217079 (1993-06-01), Kettner et al.
Atlas Copco Tools
Smith Scott A.
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