Importance

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Abstract

A device for driving a screw, pin, rivet or the like into a threaded or drilled hole is disclosed which is adapted to operate a nozzle comprising a pair of nozzle halves to pinch it. When driving a screw by means of the device as a screw driver, a thrust sleeve is displaced forwards by operating an E-shaped control lever on a stationary cylinder and thereby the nozzle halves are depressed at their rear parts so that they are opened. Then the screw to be driven is located in position midst the nozzle halves kept open and thereafter the control lever is restored to the original position. A press block is displaced forwards by means of a spring in the thrust sleeve and expands the nozzle halves, causing the nozzle to be opened to firmly hold the screw. By locating the nozzle with the screw held thereby just in front of a threaded hole and then lightly pushing a rotary cylinder, while rotating the same, a center rod is displaced forwards and thereby the thrust sleeve is in turn displaced forwards to depress the nozzle halves. As a result the nozzle is opened and disengaged from the screw and at the same time it is driven by the free end portion of the center rod. The control lever may be formed in a triangular shape in cross section and have a surface extension for easy operation by an operator's finger.

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First Claim