Apparatus for aligning trolleys

Details Apparatus for aligning trolleys Apparatus for aligning trolleys

1980-12-31

1982-11-09

Schacher, Richard A.

Traversing hoists

With haul-in line

212153, 212218, 105163SK, 414460, B66C 502

Patent

active

043580203

ABSTRACT:
In a crane having two trolleys free to move independently and parallel to each other and supporting a common load, such as a spreader, an apparatus is provided to alert the operator of the crane when the common load is excessively skewed. In one embodiment, a flexible inextensible cable connects the two trolleys together. One end of the cable is joined to one trolley and the other end of the cable is joined to a constant tension spring carried by the other trolley. Once the two trolleys are aligned without the common load being skewed, any relative motion between the two trolleys causes the load to become skewed and a change in relative position of that end of the cable joined to the constant tension spring. A tripping device is positioned adjacent to that end of the cable joined to the constant tension spring. The tripping device actuates an alarm or other suitable circuit to alert the crane operator when the two trolleys are excessively misaligned or when the load carried by the trolleys has been excessively skewed.

REFERENCES:
patent: 3703016 (1972-11-01), Schramm
patent: 3826380 (1974-07-01), Lenander

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