Support prop

摘要

PCT No. PCT/GB94/00961 Sec. 371 Date Jun. 26, 1996 Sec. 102(e) Date Jun. 26, 1996 PCT Filed May 5, 1994 PCT Pub. No. WO94/27029 PCT Pub. Date Nov. 24, 1994The support prop consists of an outer robe (12) with an open flared mouth (14) into which a plunger (16) projects. A deforming ring (18) in use engages the plunger and is initially located within the flared mouth of the outer tube. A chamber (26) is provided within the prop into which fluid under pressure can be introduced through an inlet (28) to the chamber to locate the prop between two surfaces by displacing the plunger relative to the outer tube. A seal (24) is located within the chamber to prevent the fluid from escaping between the plunger and the bore of the outer tube.