Pneumatically operated screw driver

Details Pneumatically operated screw driver Pneumatically operated screw driver

2004-09-03

2008-05-13

Hail, III, Joseph J. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Machine

C081S054000, C081S057420, C081S430000, C081S433000, C081S434000

Reexamination Certificate

active

07370559

ABSTRACT:
A pneumatically operated screw driver ensuring a complete return of a piston to its top dead center. The screw driver has a compressed air return chamber for returning the piston to its top dead center by applying a compressed air in the return chamber to the piston. The piston includes a main piston and an auxiliary piston. The main piston is first reaches its bottom dead center, and then the auxiliary piston reaches its bottom dead center whereupon screw driving is terminated. Before the auxiliary piston reaches its bottom dead center, and after the main piston moves past a predetermined position, a compressed air is introduced into the return chamber. After the main piston reaches the bottom dead center, application of the compressed air pressure in the return chamber to the auxiliary piston is prevented.

REFERENCES:
patent: 6026713 (2000-02-01), Ohmori et al.
patent: 6880431 (2005-04-01), Wakabayashi et al.

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