The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 1995
Filed:
Apr. 08, 1992
Heinz Hasselmann, Hagen, DE;
Anton Munzebrock, Dortmund, DE;
Peter Stehr, Hagen, DE;
Walter Voll, Hassfurt, DE;
Mannesmann Aktiengessellschaft, Dusseldorf, DE;
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.