E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
E21D 15/32 (2006.01) E21D 15/44 (2006.01)
Patent
CA 2162369
The support prop consists of an outer tube (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.
Bacon Stuart Michael
Greenwood Andrew Thomas
Hillier Allan Winston
Spearing Anthony John Spencer
Terblanche Ivan
Advanced Mining Software Limited
Dorbyl Limited
Gowling Lafleur Henderson Llp
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