A releasing device for attachment to existing pit props of section metal, tubes or timber

摘要

390,027. Mine props. RICHARDS, F., 14, Brynheulog Street, Port Talbot, Glamorgan. June 16, 1932, No. 17001. [Class 20 (ii).] A head or foot fitting 1 for pit props is arranged so that it is held normally in alignment with the prop by means of a stop, removal of which allows tilting between the prop and fitting. The fitting 1 is provided with a groove 2, against which abuts the wedgeshaped end of the prop, and also with extensions 4 which embrace the prop, pin-stops 5 in these extensions being used to retain the fitting and prop in alignment. Removal of one of the stops 5 will allow relative rotation and disengagement of the prop and and the fitting. A hinged stop 6, Fig. 6, may be used in place of a pin stop 5. The extensions may comprise rods 23 provided with eyes 24, 25, Fig. 12, and the fitting may be formed as a socket to receive a wooden plug.