Patent ID: 7484442
Filing Date: 2009-02-03
Classification: B25B

Abstract:
1. A torque adjustable screwdriver having a torque indicator, comprising: a holding portion including a handle, a spring, and a stopper; the handle being a hollow cylinder; one first end of the handle being formed with inner threads and having two cambered slots at two opposite sides; and a second end of the handle also having inner threads; the stopper having a threaded hollow post; in assembly, the threaded hollow post being engaged to the outer threads of the second end of the handle; the spring being received in the hollow space of the handle; the operation unit having a ratchet unit, a rotary rod, an exposed post, and a screwdriver head; the rotary rod being a long rod; one end of the rotary rod being formed with an enlarged end; one end surface of the enlarged end having teeth; the rotary rod being installed within the handle and passing through the spring and the stopper; the spring resisting between one end of the enlarged end and the stopper; the ratchet unit having an approximate cylinder shape and one end surface of the ratchet unit being formed as a sawteeth surface; in assembly, the ratchet unit being engaged to the teeth of the enlarged end of the rotary rod; and a setting unit including a driving rod, a rotary unit, a resisting unit, and an adjusting cover; the rotary unit being a hollow cylinder with outer threads at one end; an inner side of the rotary unit having the outer threads being formed with a teeth; the outer threads of the rotary unit being engaged to the inner threads of the handle; an end of the rotary unit without the outer threads resisting against one end of the ratchet unit; a middle section of the driving rod having a plurality of protruding teeth; one end of the driving rod being formed as an enlarged head; in assembly, the driving rod being installed within the handle; the enlarged head resists against the ratchet unit for limiting the movement of the driving rod; when the driving rod is pulled outwards, the teeth of the driving rod are engaged to the teeth of the rotary unit.