Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Patent
1989-09-15
1990-10-23
Schmidt, Frederick R.
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
811211, 81475, B25B 1300
Patent
active
049643193
ABSTRACT:
A socket wrench device is used to rotate a spark plug. The device includes a socket member with a socket to fit the spark plug. An endless series of ratchet teeth are provided on the socket member so as to engage with another endless series of ratchet teeth which are provided on a driving member. The driving member is retained on the socket member in such a manner that the ratchet teeth of the driving member are engaged removably with those of the socket member. An annular spring element is sleeved on the driving member so as to bias the two series of ratchet teeth to join together. When the device rotates the spark plug to an appropriate position in the cylinder of an internal combustion engine, an external torque which is applied to the device compresses the spring element, so that the ratchet teeth of the driving member are disengaged from those of the driving member, thereby stopping the rotation of the spark plug relative to the cylinder.
REFERENCES:
patent: 3869945 (1975-03-01), Zerver
patent: 4090121 (1978-05-01), Czeczerski
Cruz Lawrence
Schmidt Frederick R.
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