Mine roof bolts and the like

Claim 1

A MINE ROOF BOLT COMPRISING AN ELONGATED BOLT MEMBER HAVING AN ENLARGED HEAD PORTION AT ONE END AND A THREADED PORTION AT THE OPPOSITE END CARRYING SUPERIMPOSED RIGHT AND LEFT HAND THREADS, A RIGHT HAND THREAD NUT AND A SPACED APART LEFT HAND THREAD NUT ON SAID THREADED PORTION, A PLURALITY OF INCLINED PLANAR FACES ON EACH OF SAID NUTS, THE FACES ON EACH OF SAID NUTS CONVERGING TOWARD THE RESPECTIVE ENDS OF THE BOLT, WHEREBY THE LARGER ENDS OF THE NUTS ARE IN FACING RELATIONSHIP, AN INTEGRAL CYLINDRICAL SHELL ON ONE OF SAID NUTS EXTENDING AXIALLY THEREOF AROUND THE BOLT FROM THE HIGHEST POINT OF SAID INCLINED FACES TOWARD THE OTHER OF SAID NUTS A PLURALITY OF WEDGE SHELL MEMBERS EQUAL IN NUMBER TO THE INCLINED FACES ON EACH NUT, SAID WEDGE SHELL MEMBERS HAVING INNER INCLINED FACES AT EACH END THEREOF MATCHING AND BEARING ON THE INCLINED FACES OF SAID NUTS, SAID SHELL MEMBERS BEING ADAPTED TO BE FORCED RADIALLY OUTWARDLY FROM THE AXIS OF THE BOLT BY LONGITUDINAL MOVEMENT OF THE NUTS ON THE BOLT AND RESILIENT MEANS SURROUNDING THE WEDGE SHELL MEANS URGING SAID SHELL MEANS TOWARD THE INCLINED FACES ON THE NUTS, THE INCLINED FACES OF THE WEDGE SHELL MEMBERS BEARING ON THE INCLINED SURFACES OF THE NUT CARRYING THE CYLINDRICAL SHELL BEING SHORTER THAN THOSE ON THE OPPOSITE END OF SAID MEMBERS WHEREBY SAID FACES RUN OFF THE INCLINED FACES ON THE NUT AND BEAR ON THE CYLINDRICAL SHELL PERMITTING THE NUT TO TURN WITH THE BOLT SO THAT ITS POSITION ON THE BOLT REMAINS STATIONARY.