US 12,221,859 B2
Ball-clamp type fall arrester for drill pipe
Xuyong Liu, Guangdong (CN); Youlin Li, Guangdong (CN); and Guanghong Deng, Guangdong (CN)
Assigned to Guangdong Eagler Geological Equipment Technology Co., Ltd, Zhuhai (CN)
Filed by Guangdong Eagler Geological Equipment Technology Co., Ltd, Guangdong (CN)
Filed on Jun. 9, 2023, as Appl. No. 18/207,684.
Claims priority of application No. 202210665592.3 (CN), filed on Jun. 13, 2022.
Prior Publication US 2023/0399923 A1, Dec. 14, 2023
Int. Cl. E21B 40/00 (2006.01)
CPC E21B 40/00 (2013.01) 13 Claims
OG exemplary drawing
 
1. A ball-clamp type fall arrester for a drill pipe, comprising a base (1) and a steel ball seat (2) arranged in the base (1), wherein the steel ball seat (2) is provided with a liftable steel ball frame (3), a side wall of the steel ball frame (3) is provided with a plurality of limit holes (31), an inner wall of the steel ball seat (2) is provided with a guide ramp (20), each limit hole (31) is provided with a steel ball (4) which is movable radially, and wherein when the steel ball frame (3) is lifted or lowered, a radial position of each steel ball (4) in a corresponding limit hole (31) is positioned by the guide ramp (20), wherein the base (1) is provided with a fork (11), which is rotatably arranged on the base (1) through a pin (13), a top of the steel ball frame (3) is provided with a flange (32) extending radially outwardly, a front end of the fork (11) is clamped at the steel ball frame (3) and abuts against the flange (32).