Pneumatically operated screw driver

Details Pneumatically operated screw driver Pneumatically operated screw driver

1996-05-31

1998-03-24

Meislin, D. S.

Tools

Wrench, screwdriver, or driver therefor

Machine

173 935, B25B 2100

Patent

active

057300356

ABSTRACT:
A pneumatically operated screw driver having a moving unit rotatable about its axis by rotation of a rotor and movable axially by a pneumatic pressure. The moving unit includes a spline shaft supported by the rotor through a ball spline, and a drive bit aligned with the spline shaft and engageable with a head of a screw. The spline shaft has an annular flange portion. A movable piston is disposed concentrically over the spline shaft and movable in an axial direction thereof with respect to the spline shaft. A spring is disposed over the spline shaft and is interposed between the movable piston and the flange portion. A stop member is provided to a rotor or a frame body. If pneumatic pressure is applied to the movable piston, the latter is axially moved downwardly and is brought into abutment with the stop member. The spline shaft is also moved axially slightly after the movement of the movable piston. The shrinkage of the spring will generate shape-restoration force thereof to further move the spline shaft after the stop of the movable piston.

REFERENCES:
patent: 5186084 (1993-02-01), Totsu
patent: 5231902 (1993-08-01), Uno et al.

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