Implements or apparatus for applying pushing or pulling force – Hoisting truck – Screw
Patent
1985-03-13
1986-05-20
Schmidt, Frederick R.
Implements or apparatus for applying pushing or pulling force
Hoisting truck
Screw
254 8B, 254 89R, B60P 110
Patent
active
045896305
ABSTRACT:
A system of jacking apparatus includes an extendible jack stand with a ratchet for latching it in an extended position, and a power unit which can be selectively engaged with or disengaged from the jack stand. The power unit includes a screw-driven scissors which is interposed between upper and lower plates of the jack stand for raising the jack stand.
The jack stand has a ratchet plate whose lower end protrudes in an exposed location where it can be engaged by a ratchet release member in the power unit.
The power unit is also independently usable as a jack, having a pivotally supported flip-top cover which can be placed over the top of the scissors for engaging and supporting a load.
REFERENCES:
patent: 2476762 (1949-07-01), Detre et al.
patent: 3834669 (1974-09-01), Reid
patent: 3850419 (1974-11-01), Craig
patent: 4123038 (1978-10-01), Meyers
patent: 4177978 (1979-12-01), Warsaw
Arant Gene W.
Hartman Judy J.
Safe-T-Jack, Inc.
Schmidt Frederick R.
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