Automatic shaft lock

Tools – Wrench – screwdriver – or driver therefor – Machine


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173 12, B25B 1700




An automatic shaft lock for use in power tools with one end that carries implements such as screwdriver heads, drill bits and the like, permits use of the tool manually, i.e., without power. The locking mechanism allows rotation of the shaft by the motor but locks rotation of the shaft when torque is applied at the implement end or to the housing so as to allow manual use of the tool. In the preferred embodiment, a locking ring is concentric with an end of the spindle that is connected to the implement and also with an end of the output shaft driven by the motor. A wedging pin wedges against the locking ring to prohibit rotation of the spindle and the output shaft except when the spindle is driven by the output shaft which, when driven in either direction, traps the pin in a non-wedging position.

patent: 3802518 (1974-04-01), Albert
patent: 3866493 (1975-02-01), Ringerud
patent: 4448098 (1984-05-01), Totsu


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