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Peter Mommertz
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Individual
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Individual
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Publication of GB190609126ApublicationCriticalpatent/GB190609126A/en
9126. Mommertz, P. April 17. Shoring and strutting.-Mine props a r e constructed of a lower tubular member a, Fig. 3, fitted with a base c and adapted to receive an upper member d, which is retained in position by wedges g carried by a collar b supported on the lower member a. Fig. 8 shows a modification, in which the stroke of the wedge g is adjusted by a transverse wedge f, which may be replaced by a screw. Fig. 11 shows a further modification, in which the wedge g is replaced by a cam k.