Boom length sensing and indicating system with self-synchronizat

Details Boom length sensing and indicating system with self-synchronizat Boom length sensing and indicating system with self-synchronizat

1977-12-16

1978-12-26

Haroian, Harry N.

Geometrical instruments

Area integrators

Electrical

116124F, G01B 312

Patent

active

041309405

ABSTRACT:
A boom length sensing and indicating system for a crane of the type having an operator's cab, in which changes in the extended length of the boom are sensed and a signal representative of the sensed changes is generated. The changes are sensed and the representative signal generated by a cable that winds and unwinds from a reel mounted on the boom in response to changes in boom length. A boom length indicator mounted in the cab of the crane has a movable dial or pointer to indicate the extended length of the boom. A stepping motor connected to the indicator receives the generated signal representative of the sensed changes and drives the indicator by an amount and in a direction related to the sensed changes. A pair of stops cooperate with the indicator to prevent movement of the indicator beyond predetermined upper and lower extremities of indicator movement regardless of sensed changes in the extended length of the boom, thereby providing self-synchronization of the indicator.

REFERENCES:
patent: 3780440 (1973-12-01), Taylor
patent: 3812589 (1974-05-01), Schultheis

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