Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Patent
1999-10-29
2000-11-28
Meislin, D. S.
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
81438, B25B 1346
Patent
active
061519944
ABSTRACT:
A ratchet screwdriver includes a handle defining a ratchet shaft receiving hole therethrough, and a ratchet shaft disposed therein. The ratchet shaft has a ratchet wheel mounted securely between first and second end portions, and an engaging unit between the ratchet shaft and a drive shaft inserted in the first or second end portions to prevent axial displacement and permit co-rotation thereof. A ratchet housing includes a coupling portion sleeved on the ratchet shaft and coupled to the handle for co-rotation therewith, a wheel confining portion defining a cavity enclosing the ratchet wheel, and a shoulder between the coupling and wheel confining portions. The wheel confining portion is formed with a pawl retaining groove in communication with the cavity to receive a pawl member which is mounted pivotally on the shoulder and which extends radially into the cavity. A biasing member biases the pawl member to mesh with the ratchet wheel such that when the handle is driven in a counterclockwise direction, the ratchet and the drive shafts correspondingly rotate in the counterclockwise direction. The handle is turned 180 degrees along a radial line to reverse positions of the first and second end portions of the ratchet shaft to permit rotation of the handle in the clockwise direction.
REFERENCES:
patent: 5875692 (1999-03-01), Lin
patent: 5964132 (1999-10-01), Chen
patent: 5967003 (1999-10-01), Lin
patent: 6076432 (2000-06-01), Chang
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