Buttressed sprag plate

Details Buttressed sprag plate Buttressed sprag plate

E - Fixed Constructions

21

D

61/67

E21D 17/05 (2006.01) E21D 15/52 (2006.01) E21D 23/06 (2006.01)

Patent

CA 1110859

A B S T R A C T The invention relates to mine working apparatus including a sprag plate. The sprag plate is included in a sprag unit that can be reciprocated in the fore- and-aft direction of the canopy and the sprag unit includes a sprag slide and a link system that can be reciprocated in the fore-and-aft sense relatively to each other. There is a range of lost motion between the slide and the link system and the means for moving the sprag unit between the position in which the sprag plate is operative and the position in which the sprag plate is inoperative also moves the sprag slide and the link system relatively to each other through their range of lost motion and this relative movement swings the sprag plate between a generally upright, operative, position and a generally horizontal, retracted position.

325988

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