PIPE WRENCH Russian patent published in 1997 - IPC

FIELD: oil refining machine engineering, particularly all branches of national economy for screwing and unscrewing threaded joints of tubes and other cylindrical parts. SUBSTANCE: jaw 2 jointly connected with handle 1 is built-up one. Said jaw includes two side pieces and shaped member 9 placed between side pieces, secured to respective side pieces and having common surface with them. Shaped member 9 has cavity for securing second end of spring 13. In order to mount wrench on tube it is inserted inside tube by means of jaws 2,3 spring-loaded by spring 13. Then lengthwise effort is applied to handle 1. EFFECT: enhanced reliability of wrench operation, lowered labor consumption of it manufacture. 2 dwg