Method and apparatus for the wireless control of lift devices by

Details Method and apparatus for the wireless control of lift devices by Method and apparatus for the wireless control of lift devices by

1992-04-08

1995-03-28

Chilcot, Jr., Richard E.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359142, 359154, 212160, 34082572, H04B 1000

Patent

active

054022576

ABSTRACT:
In this method and apparatus for the wireless control of a lift device and, in particular, of a traveling crane, a plurality of transmitting units communicate by infrared transmission of data telegrams to a receiving unit associated with the crane. The data telegrams include an integrated address signal that is unique to each transmitting unit and is stored in a memory module of the transmitting unit. The receiving unit decodes the data telegram and, if the crane is not then in use, stores the address signal in a comparison circuit of the receiving unit. Only subsequently-received data telegrams incorporating the stored address signal are passed to the crane for controlling the crane, thereby assuring that a user not then in control of a crane operation cannot interfere with its operation. Each transmitting unit also includes a user-operable release switch for releasing that user's control of the crane by clearing the address signal then stored in the comparison unit so as to permit control of the crane by other users through other transmitting units.

REFERENCES:
patent: 4236255 (1980-11-01), Burgener et al.
patent: 4430652 (1984-02-01), Rothenbuhler et al.
patent: 4661991 (1987-04-01), Logemann
patent: 4673911 (1987-06-01), Yoshida

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