Lifting device

Details Lifting device Lifting device

1977-12-30

1979-11-27

Paperner, L. J.

Material or article handling

Apparatus for moving material to a position in the erection...

Flat wall or ceiling member manipulating means

254 10C, 414917, B66F 722

Patent

active

041758994

ABSTRACT:
A device for raising and lowering sheets of building material utilizes a base support platform on which is attached a support bracket member and a pair of serially connected first and second parallelogram members pivotally joined by a right angle member with the other end of first parallelogram member pivotally connected to the base support platform and the other end of second parallelogram member pivotally connected to an object supporting platform. A spacer arm is pivotally connected to the support bracket and to one leg of the second parallelogram member proximately midway between pivotally connected ends to keep the object supporting platform on a long radius curve or generally straight vertical direction of movement. Hydraulic means are provided for actuating the spacer arm to raise and lower the object supporting platform.

REFERENCES:
patent: 2500815 (1950-03-01), Gerli et al.
patent: 2899084 (1959-08-01), Brunnemer et al.
patent: 3522898 (1970-08-01), Rotheisler
patent: 3952890 (1976-04-01), Armstrong
patent: 3995746 (1976-12-01), Usagida

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