Traversing hoists – Overhead – Cable
Patent
1974-11-14
1976-06-22
Makay, Albert J.
Traversing hoists
Overhead
Cable
B66F 906
Patent
active
039646149
ABSTRACT:
A portable, readily attachable and detachable, mobile materials handling device which is capable of being selectively connected at or near the extreme end of the boom of a crane, for example, a hydraulic crane, to provide the crane with a fork lifting capability. When suspended from the boom head of a crane, the device is free from engagement with any support member of the crane other than the boom head. The attachment comprises elevator means which include a fork lift carriage assembly capable of being raised and lowered in cooperation with a plurality of telescoping channel members by the operation of the load line of the crane to achieve the desired lifting functions at all positions accessible by the boom of the crane. Leveling means are provided for maintaining the orientation of the fork lift, for example, in a substantially horizontal position, wherein the main frame of the elevator mechanism is maintained in a substantially vertical position. The leveling means comprise a pair of spaced leveling members defining gear racks which mate with similar drive pinions driven by a power source conncted to the power system of the crane. The leveling members are secured to the elevator means so that, by operation of the drive pinions, the lower end of the elevator means may be advanced or retracted relative to the vertical by the tracking of the leveling members. The apparatus is arranged for convenient and rapid attachment to the crane, and the method of attachment is disclosed wherein the load line of the crane is reeved about a plurality of guide members, to connect to the boom of the crane. When so positioned, the device is raised into a connecting alignment with attaching pins on the boom head to be automatically secured thereabout with a locking member. The primary laching mechanism comprises the attaching pins on the boom of the crane which cooperate with cammed, generally U-shaped slots on plates secured to the device and further includes the locking members for enveloping the attaching pins and being secured thereabout by a dog member. A secondary safety locking mechanism is disclosed comprising laterally actuatable pins in the plates on the device to be secured in mating recesses in the boom head by the operation of the secondary pin latching mechanism. The apparatus is characterized as being readily attached and detached from the boom of the crane and as being operable throughout the range of operation of the boom, for example, 0 to 70 degrees or more relative to a horizontal plane. Moreover, the load space above the fork lift is substantially free from interfering members to accommodate a wide variety of loads.
In another embodiment, the leveling means comprises one or more hydraulically actuated members, for example, hydraulic cylinders, connected either directly or through linking means to the elevator means for orienting the fork lift carriage assembly.
REFERENCES:
patent: 1384768 (1921-07-01), Luce
patent: 2646182 (1953-07-01), Maas
Makay Albert J.
Oresky Lawrence J.
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