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:
May. 28, 2002
Filed:
Oct. 19, 2000
Xiangqian Gao, Beijing, CN;
Enqian Zhan, Beijing, CN;
Heng Su, Beijing, CN;
Fenrong Cheng, Beijing, CN;
PetroChina Company Limited, Beijing, CN;
Abstract
The invention relates to a liquid controlled disk braking device having a brake disk, brake caliper, and a caliper carrier. The brake disk is postionable on the roller of a main hoist and forms a brake pair together with the brake calipers. A combination of service and emergency calipers, each caliper being responsive to fluid pressure, is used to effect operational and stationary braking. Service calipers are used to apply operational braking forces against the brake disk when the disk is rotating, applying braking forces when subjected to fluid pressure. Emergency calipers are used to apply braking forces when the brake disk is stationary or when liquid pressure to the caliper has been removed or lost.