Rotary shafts – gudgeons – housings – and flexible couplings for ro – Overload release coupling – Torque transmitted via resiliently biased positive drive...
Patent
1980-11-03
1982-12-28
Petrakes, John
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Overload release coupling
Torque transmitted via resiliently biased positive drive...
74412TA, 192 56R, 192150, F16D 900
Patent
active
043659624
ABSTRACT:
In a motor operated hand-held tool, such as a hammer drill, a drive train transmits driving force from a motor to a drive spindle. The drive train includes a safety clutch positioned on a shaft for interrupting the transmission of driving force if a torque overload occurs. The safety clutch has a hub encircled by a gear ring with spring-biased balls releasably interengaging the hub and ring for transmitting the driving force. The hub is engaged with a thread on the shaft and under normal operation a spring prevents the hub from being rotated relative to the shaft and being displaced axially along the shaft. During torque overload conditions the hub acting against the spring moves axially along the shaft until the hub and gear ring are released.
REFERENCES:
patent: 1651822 (1927-12-01), Johnston
patent: 1657274 (1928-01-01), Niedhammer
patent: 3018866 (1962-01-01), Elliott et al.
patent: 3688522 (1972-09-01), Schmuck
patent: 3835666 (1974-09-01), Hoffman
patent: 4081704 (1978-03-01), Vassos et al.
patent: 4220230 (1980-09-01), Hansen
patent: 4291553 (1981-09-01), Kato et al.
Hilti Aktiengesellschaft
Petrakes John
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