초록 ▼

An operating system for telescoping a telescopic boom for a crane, particularly a boom having three or more telescoping sections, enabling the boom to be extended and retracted automatically under load according to a predetermined sequence which optimises the load capacity of the boom and the stabil

An operating system for telescoping a telescopic boom for a crane, particularly a boom having three or more telescoping sections, enabling the boom to be extended and retracted automatically under load according to a predetermined sequence which optimises the load capacity of the boom and the stability of the crane. The boom may be switched rapidly between modes of operation in one of which all of the telescoping sections may extend or retract and in another of which at least one telescoping section is maintained in the fully retracted position.

대표청구항 ▼

[ We claim:] [1.] A method for controlling a telescopic boom having at least three boom sections, comprising:(a) storing at least one boom extension table, said boom extension table including a plurality of telescopic boom lengths and, for each telescopic boom length, a section length corresponding

[ We claim:] [1.] A method for controlling a telescopic boom having at least three boom sections, comprising:(a) storing at least one boom extension table, said boom extension table including a plurality of telescopic boom lengths and, for each telescopic boom length, a section length corresponding to each boom section;(b) inputting one of retraction and extension control signals from an operator;(c) determining a sequence of boom section movements based on said boom extension table and said input control signal; and(d) controlling movement of said boom sections in accordance with said sequence of boom section movements.