Implements or apparatus for applying pushing or pulling force – Step-by-step traveling bar – Pawl actuated
Patent
1977-03-18
1978-08-01
Hoffman, Drayton E.
Implements or apparatus for applying pushing or pulling force
Step-by-step traveling bar
Pawl actuated
188181T, 2541873, B66D 100
Patent
active
041038738
ABSTRACT:
The disclosure relates to an overload protection apparatus for hoisting machines such as rope hoists or chain blocks. One gear incorporated in the reduction gear train of the hoisting machine is composed of an outer and an inner gear units between which torque is transmitted through resilient means acting therebetween. The resilient means are adapted to be compressed, upon receipt of an excessively large torque, i.e. in case of an overload, to allow a relative movement in the direction of rotation between the outer and the inner gear units. The relative movements of the gear units in the direction of rotation is then converted into a movement in the direction of thrust. Detecting switch is provided for opening an electric circuit for lifting, upon detecting the movement in the direction of thrust, thereby to stop the lifting operation.
REFERENCES:
patent: 1883164 (1932-10-01), Jassakos
patent: 2901076 (1959-08-01), Dean
patent: 3194371 (1965-07-01), Rabinow
patent: 3285573 (1966-11-01), Hanawa et al.
patent: 3305058 (1967-02-01), Orwin et al.
patent: 3754413 (1973-08-01), Borrini
Furuichi Mitsuyuki
Gomi Shigenori
Sato Isao
Hitachi , Ltd.
Hoffman Drayton E.
Underwood Donald W.
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