Power screwdriver and clutch mechanism used therein

Details Power screwdriver and clutch mechanism used therein Power screwdriver and clutch mechanism used therein

1996-01-31

1998-04-07

Meislin, D. S.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

81480, 81477, 192816, B25B 23157

Patent

active

057351830

ABSTRACT:
A power screw driver includes a clutch mechanism composed of a coiled clutch spring so designed as to entangle a drive shaft member and an output shaft member to connect them together, thereby enabling the drive and output shaft members to rotate in unison. By the use of the coiled clutch spring, the clutch engaging operation is achieved smoothly and silently without accompanying impact blow or shock, thereby securing reliable transmission of a torque from the drive shaft member to the output shaft member. The coiled clutch spring may be activated only when the drive shaft member is rotating in the forward direction, in which instance a one-way clutch is used to undertake transmission of the torque when the drive shaft member is rotating in the reverse direction. As an alternative, a single clutch spring may be used to undertake transmission of the torque in the forward and reverse rotational directions. Alternatively, two coiled clutch springs each provided for one rotational direction may be used.

REFERENCES:
patent: 4655103 (1987-04-01), Schreiber et al.

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