Title:
BOAT LIFTING DEVICE
Document Type and Number:
Japanese Patent JP3716074
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a boat lifting device which allows stable pullup operation of a boat by absorbing a steep change of the apparent weight of the boat when the sea surface level is changed abruptly by the wave.
SOLUTION: A boat lifting device has a winch 10 equipped with a hydraulic motor 10A, and a high pressure accumulator 36 and a low pressure accumulator 37 are connected through pilot check valves 34 and 35 to the high pressure side circuit 32 and low pressure side circuit 33 of the hydraulic motor 10A, and the check valves 34 and 35 are opened when the winch 10 is in the wind-up operation. When the load pressure of the motor 10A has risen abruptly, the oil pressure of the high pressure side circuit 32 is released to the high pressure accumulator 36, and the motor 10A is rotated reversely so as to pay off a wire rope reversely, and thereby an impact force applied to the wire rope and boat is relieved.
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Inventors:
Kenji Sato
Application Number:
JP14487997A
Publication Date:
November 16, 2005
Filing Date:
June 03, 1997
Export Citation:
Assignee:
Kayaba System Machinery Co., Ltd.
International Classes:
B63B23/48; B66D1/50; (IPC1-7): B66D1/50; B63B23/48
Domestic Patent References:
| JP60017436Y1 | ||||
| JP54136060A | ||||
| JP61179191U |
Attorney, Agent or Firm:
Masaki Goto
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