Impulse wrench with angle sensing means

Details Impulse wrench with angle sensing means Impulse wrench with angle sensing means

2004-11-30

2008-11-18

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Automatic and/or with time-delay means

With respect to a fixed standard, master or reference device

C388S937000, C173S183000

Reexamination Certificate

active

07453225

ABSTRACT:
In an impulse wrench there is provided an impulse unit with a motor driven inertia drive member, and a movement detecting device arranged to detect an angular movement of the inertia drive member. The movement detecting device includes a rotating disc rigidly connected to and co-rotating with the inertia drive member. The impulse wrench also includes a sensing device including four Hall-element type sensors, and the disc has a rim portion which is magnetised to provide a number of magnetic poles for activating the sensors at rotation of the inertia drive member. The sensors are arranged in pairs such that the delivered signals from the sensors in each pair has a relative phase lag of 180 degrees, and the sensors of one of the pairs are arranged to deliver signals with a phase lag of 90 degrees relative to the sensor signals from the other pair.

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