1
George A Hibbard, Ward D Morrison, Ralph C Lumbra: Mine roof driller-bolter apparatus and method. Joy Manufacturing Company, William J O Rourke Jr, Raymond W Augustin, December 13, 1983: US04420277 (29 worldwide citation)

An apparatus for bolting the roof of an underground mine is disclosed comprising a mobile frame, a boom extending from the frame and a housing provided at the end of the frame. The housing supports an upwardly extending stinger, a drilling mechanism including a drill centralizer having a central bor ...


2
Edward A Bailey, Rene Pertusio, George A Hibbard: Bit coupling means. Joy Manufacturing Company, March 9, 1976: US03942838 (26 worldwide citation)

A rock hammer and more particularly a rock hammer having thereon improved means for securing a cutting or breaking bit assembly thereto.


3
George A Hibbard, Ward D Morrison: Hammer. Consolidated Technologies Corporation, November 5, 1985: US04550785 (20 worldwide citation)

A hydraulically operable hammer and more particularly a hydraulically operable hammer having improved cycling of a hammer piston reciprocable therewithin.


4
George A Hibbard: Hammer. Joy Manufacturing Company, E Wallace Breisch, August 11, 1981: US04282937 (8 worldwide citation)

A hydraulically operable hammer and more particularly a hydraulically operable hammer having improved cycling of a hammer piston reciprocable therewithin.


5
George A Hibbard: Hammer. Arnold B Silverman, March 22, 1977: US04012909 (8 worldwide citation)

A hammer and more particularly a fluid operable hammer wherein alternating impetus provided by pressurized liquid and gas means actuates a reciprocable hammer piston to generate repetitive impact loads.


6
George A Hibbard: Fluid operable hammer. Joy Manufacturing Company, December 13, 1977: US04062268 (5 worldwide citation)

A hammer and more particularly a fluid operable hammer wherein alternating impetus provided by pressurized liquid and gas means actuates a reciprocable hammer piston to generate repetitive impact loads.


7
George A Hibbard: Hammer having fluid biased work member. Joy Manufacturing Company, May 16, 1978: US04089380 (3 worldwide citation)

A hammer and more particularly a fluid operable hammer wherein alternating impetus provided by pressurized liquid and gas means actuates a reciprocable hammer piston to generate repetitive impact loads. A work member is provided to receive blows from the hammer and includes an enlarged portion locat ...


8
George A Hibbard: Rock drill. Joy Manufacturing Company, George Patrick Baier, May 5, 1981: US04265321 (3 worldwide citation)

A percussive rock drill and more particularly a percussive rock drill having improved means for passing a flow of flushing fluid therethrough.


9
George A Hibbard: Rock drill. Joy Manufacturing Company, J Stewart Brams, November 13, 1979: US04174010 (3 worldwide citation)

A percussive rock drill and more particularly a percussive rock drill having improved means for passing a flow of flushing fluid therethrough.


10
Edward A Bailey, George A Hibbard: Air manifold and delivery passageways for rock drill. Joy Manufacturing Company, December 21, 1976: US03998279

An improved fluid operated rock drill apparatus having all fluid connections thereto secured to the yoke of the drill assembly by a unitary connector means. The yoke is centrally located so that the high pressure fluid being directed to the rock drill hammer piston flows through a path of reduced le ...