Title:
LARGE-SIZED CRANE HAVING ELECTRIC SHOCK REDUCING FUNCTION
Document Type and Number:
Japanese Patent JP3019259
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a large-sized crane having an electric shock reducing function of a simple structure capable of permanently and effectively reducing electric shock by high frequency high voltage generated by resonating broadcasting radio waves.
SOLUTION: Because an electric shock reducing device 13 has wire suspended from the vicinity of a tip on one end side of a crane movable beam 6b into the sea in a vertical direction, an impedance varying part 15 interposed serially on the halfway of wire 14 (a coil and a condenser are serially connected) and an electrode plate 17 provided in a state that the plate 17 is buried into the sea at a lower tip part of wire 14, a resonance frequency of a container crane 1 for broadcasting radio waves is changed by the impedance varying part 15 and also a sharpness degree Q becomes small, high frequency voltage induced by broadcasting radio waves becomes lower. Therefore, electric shock due to high frequency voltage acting on a lifting sling member 11 by resonance with broadcasting radio waves can be surely reduced.
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Inventors:
Shigeru Sasaki
Takeuchi Yasuki
Takeuchi Yasuki
Application Number:
JP22056898A
Publication Date:
March 13, 2000
Filing Date:
August 04, 1998
Export Citation:
Assignee:
Kawasaki Heavy Industries, Ltd.
International Classes:
B66C15/00; B66C19/00; H02H9/04; (IPC1-7): B66C15/00; B66C19/00
Domestic Patent References:
| JP4236129A | ||||
| JP1104595A | ||||
| JP7237889A | ||||
| JP8251801A | ||||
| JP9235090A | ||||
| JP5781275U | ||||
| JP5332938B2 | ||||
| JP552396B2 | ||||
| JP552397B2 |
Attorney, Agent or Firm:
Toshio Okamura