Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Patent
1999-08-03
2000-11-21
Banks, Derris H.
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
81 631, B25B 1346
Patent
active
061486957
ABSTRACT:
A ratchet wheel includes an inner periphery and an outer periphery. The outer periphery includes a number of arcuate concave teeth each having two sides and an intersection of the two sides. The ratchet wheel includes a center, a line from the center to the intersection dividing an angle between the two sides into two unequal portions, thereby forming asymmetric arcuate concave teeth to provide improved structural strength and improved torque. In another embodiment, the concave teeth are non-arcuate to reduce the formation time for the teeth, thereby reducing the production cost.
REFERENCES:
patent: 2317461 (1943-04-01), Jackson
patent: 2764048 (1956-09-01), Thompson
patent: 4991468 (1991-02-01), Lee
patent: 5636557 (1997-06-01), Ma
Banks Derris H.
Ojini Anthony
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