Single failure proof crane

Details Single failure proof crane Single failure proof crane

1978-03-06

1979-11-27

Spar, Robert J.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

2541874, 192 12R, B66D 148

Patent

active

041757270

ABSTRACT:
A synergistic safety system is incorporated in a crane driven by a high-speed motor which requires both an energy-absorbing torque-limiting device in the speed reduction unit and a drum emergency holding device. The energy-absorbing torque-limiting device transmits the static and dynamic torque required to rotate or hold the drum against the maximum carried load, but will slip at a pre-determined setting to absorb high-speed rotational energy of the drive train and/or torque of the drive motor in the event a two-blocking, load hang-up, overload, or engagement of the drum emergency holding device occurs. The drum emergency holding device is set automatically when the energy-absorbing torque-limiting device is actuated and/or any drive train component fails, which are detected by one or more sensing sub-systems.

REFERENCES:
patent: 2017352 (1935-10-01), Quick
patent: 2468092 (1949-04-01), Mahnke
patent: 2489832 (1949-11-01), Symonds
patent: 2652230 (1953-09-01), Hoyle et al.
patent: 2820609 (1958-01-01), Bock et al.

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