Planetary gear transmission systems or components – Condition responsive control – Centrifugally controlled clutch or brake
Patent
1999-03-12
2000-07-25
Ta, Khoi Q.
Planetary gear transmission systems or components
Condition responsive control
Centrifugally controlled clutch or brake
475256, 173216, F16H 374, F16H 3510
Patent
active
060931280
ABSTRACT:
A ratchet wrench having a self-shifting transmission apparatus having a rotational drive and a rotational output spindle with a ratchet driven by the output spindle. A first transmission gear and an overrunning clutch are rotatably connected in series between the rotational drive and the rotational output spindle. A centrifugal clutch is rotatably connected in series between the rotational drive and the rotational output spindle. The centrifugal clutch is rotatably connected to a shaft which rotates in the overrunning clutch such that upon the drive rotating at and above a predetermined rotational speed, the centrifugal clutch engages to rotate the output spindle while rotating the shaft to overrun within the overrunning clutch. Upon the drive rotating below the predetermined rotational speed, the centrifugal clutch disengages thereby permitting the overrunning clutch to engage the shaft and rotate the output spindle through the first transmission gear.
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Ingersoll-Rand Company
Nigohosian, Jr. Leon
Ta Khoi Q.
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