| 摘要 |
A device for gripping the external wall surface of a pipe or bar without deforming or demaging the surface thereof, comprising a tubular body (1, 2) having at least one end open for insertion of a pipe or bar in a direction (17), a ball cage (8, 9) co-operating with a tapered internal wall part (11) and spring-loaded by a spring (10) and spring retaining member (3). A circumferentially split ferrule (4) has an outwardly tapered surface co- operating with the spring-retaining member (3). A metal ring (5), an anti- extrusion ring (6) and an 'O' ring seal (7) are slidably located within the body. The ball cage (8, 9) loosely retains a pipe or bar within the device, but when fluid pressure within the body (1, 2) increases the 'O' ring (7) is forced against rings (5, 6) thus in turn causing the split ferrule (4) to be compressed to grip the pipe or bar around its circumference thus to prevent it from being removed from the body (1, 2).
|
