Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Patent
1995-09-13
1997-03-11
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
192 432, B25B 1346
Patent
active
056090781
ABSTRACT:
A ratchet mechanism assembly for a ratchet screwdriver includes a cylindrical casing, a rotatable drive shaft, a pair of annular pawl members, a spring unit, and an actuator. The casing has an annular surrounding wall that defines a receiving space therein. The drive shaft has a fixed ratchet wheel journalled within the receiving space. The pawl members are disposed within the receiving space of the casing. Each of the pawl members has a pawl projection projecting from an inner periphery thereof. The spring unit biases the pawl members to cause the pawl projections to engage the ratchet wheel, in such a manner that a tooth of the ratchet wheel is located between the projections in order to prevent rotation of the ratchet wheel relative to the casing. The actuator can be moved to a first position, wherein the pawl projection of one of the pawl members disengages the ratchet wheel to permit rotation of the shaft in the casing in a first direction, and a second position, wherein the pawl projection of the other one of the pawl members disengages the ratchet wheel to permit rotation of the shaft in the casing in a second direction opposite to the first direction.
REFERENCES:
patent: 4488460 (1984-12-01), Ballone et al.
patent: 4777852 (1988-10-01), Herman et al.
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