Lifting tackle with three pulleys

• Main Author: FAN PINWEN
• Format: Patent
• Language: Chinese; English
• Published: 29.12.2010
• Subjects: CRANES; HAULING; HOISTING; LIFTING; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS,WINCHES, OR TACKLES; PERFORMING OPERATIONS; TRANSPORTING

A lifting tackle with three pulleys comprises a bed plate; an ear plate is connected with the bed plate; two pulley shaft holes are formed on a left margin plate and a right margin plate; a main pulley shaft and an auxiliary pulley shaft are respectively mounted in the two pulley shaft holes; a main pulley is mounted on the main pulley shaft; two auxiliary pulleys are mounted on the auxiliary pulley shaft; the external diameter of the main pulley is larger than those of the auxiliary pulleys; an upper support arm is assembled between the two auxiliary pulleys which are arranged in parallel, and is connected with a lower support arm fixed on the main pulley shaft through a bolt; and the ear plate is connected with the main pulley through the main pulley shaft. Compared with the conventional lifting tackle with three pulleys arranged in parallel, the utility model has the advantages that one pulley is removed, so that the eccentric force of a steel wire rope on the pulleys is reduced, which can overcome the def