Implements or apparatus for applying pushing or pulling force – Fluid pressure – Vehicle attached
Patent
1988-12-27
1990-01-02
Hartman, Judy
Implements or apparatus for applying pushing or pulling force
Fluid pressure
Vehicle attached
254100, 254104, 72705, 29239, B66F 324
Patent
active
048908185
ABSTRACT:
The door forcing apparatus for forcing a door set in a door jamb comprises two side rails each having a substantially L-shaped cross section engagable with a beveled edge between the door jamb and the door, a plurality of nearly flat drive wedges pivotally mounted on the side rails adjacent their vertices each having a nearly flat foot oriented parallel to the door pivotally mounted adjacent their circular-arc-shaped edge pressible against the door, two adjustable braces each of which comprise a bracing hydraulic cylinder or a turnbuckle which is pivotally attached to each of the two side rails adjacent one end of the apparatus, two U-shaped-cross-sectioned drive rods on each of which the drive wedges connected to the side rails are pivotally mounted and two driving hydraulic cylinders, each of which has a piston rod pivotally attached to an end of one of the drive rods and whose cylinder is pivotally mounted on a support bracket at one end of a side rail.
REFERENCES:
patent: 3741029 (1973-06-01), Bellemare
patent: 4657225 (1987-04-01), Hoehn et al.
patent: 4682765 (1987-07-01), Mainville
patent: 4762304 (1988-08-01), Hill
patent: 4783053 (1988-11-01), Yirmiyahu et al.
Hartman Judy
Kroll Michael I.
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