Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Patent
1996-04-24
1998-05-12
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
192 431, B25B 1346
Patent
active
057492727
ABSTRACT:
A ratchet screw driver 10 is provided which has a handle 20 secured to a primary shaft 40, which in turn is secured to a ratchet housing 50. The ratchet housing 50 selectively supports a secondary shaft 140 which supports driver tips 170 thereon. A switch 120 provides for selective operation of the ratchet screw driver 10 to operate only in a clockwise direction, only in a counterclockwise direction, or in a neutral position which operates in both clockwise and counterclockwise directions. The switch interacts with the ratchet mechanism in a manner such that toggling of the switch in a clockwise direction configures the ratchet screw driver 10 to then be utilizable in a clockwise direction. Toggling of the switch 120 in a counterclockwise direction causes the ratchet screw driver 10 to then be utilizable in a counterclockwise direction. The ratchet housing 50 includes a left pawl 100 and right pawl 110 supported upon a left shelf 70 and right shelf 80 within the ratchet housing 50. The left pawl 100 and right pawl 110 are actuated by the switch 120 to selectively interfere with teeth 152 on a clutch wheel 150 which is secured to the secondary shaft 140. A shroud 130 overlies the ratchet housing 50 and supports the secondary shaft 140 from translation away from the ratchet housing 50 and primary shaft 40. A cross bar 26 is provided extending laterally from the handle 20 to maximize an amount of torque which can be applied by hand to the ratchet screw driver 10.
REFERENCES:
patent: 593157 (1897-11-01), Furbish
patent: 4290328 (1981-09-01), Clark
patent: 4621718 (1986-11-01), De Carolis
patent: 4696208 (1987-09-01), Lay
patent: 5063797 (1991-11-01), Huang
patent: 5379873 (1995-01-01), Shiao
patent: 5437212 (1995-08-01), Thompson et al.
Heisler Bradley P.
Smith James G.
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