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:
Nov. 11, 2003
Filed:
May. 01, 2001
Shinobu Higashi, Niihari-gun, JP;
Kazuhisa Ishida, Tsuchiura, JP;
Kouji Funato, Niihari-gun, JP;
Toshimi Sakai, Niihari-gun, JP;
Masami Ochiai, Niihari-gun, JP;
Teruo Igarashi, Higashiibaraki-gun, JP;
Akira Nakayama, Tsuchiura, JP;
Tsutomu Udagawa, Niihari-gun, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A winch over-winding prevention apparatus includes: a winch drum that is driven for up/down hoist in response to a command issued through an operating lever; a stop switch that is activated when a suspended object raised or lowered as a hoisting cable wound around the winch drum is further taken up or fed out is hoisted up to a predetermined stop position; and a stop device that stops drive of the winch drum when the stop switch is activated, and further includes: a speed detection device that detects a hoist speed of the suspended object; a speed reduction device that reduces a drive speed of the winch drum once the suspended object reaches a predetermined speed reduction start position; and a speed reduction control device that calculates a deceleration rate of the winch drum in correspondence to the hoist speed of the suspended object detected by the speed detection device and controls drive of the speed reduction device in response to a speed reduction command corresponding to the deceleration rate.