Patents Assigned to Birmingham Bolt Company
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Patent number: 5073064Abstract: An anchor assembly for installing a threaded roof bolt under tension in a bore hole formed in underground passageways, mines, and the like. The anchor assembly includes a conventional two compartment resin cartridge and a mechanical expansion unit. A support collar is threaded on the bolt to restrict axial movement of the mechanical expansion unit. The mechanical expansion unit includes a camming plug and an expandable shell. A pair of hollow tubular sleeves are positioned intermediate the camming plug and the support collar to prevent the resin from embedding in the grooves of the threads of the bolt. Accordingly, the bolt is free to rotate relative to the substrate.Type: GrantFiled: April 27, 1990Date of Patent: December 17, 1991Assignee: Birmingham Bolt CompanyInventors: Henry A. Leonard, Charles W. Schaffer
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Patent number: 4876877Abstract: A portable tool for bending elongated mine roof bolts in situ including a stationary support portion for holding a part of a roof bolt, a movable support portion for holding another part of the roof bolt, a power cylinder and piston for moving the movable support portion in an arc to effect bending one end of the bolt, to permit insertion thereof into a mine roof opening. The power cylinder and piston being activated to return the movable support portion to its initial position, thereby straightening the bolt to permit full insertion of the bolt into the mine roof opening.Type: GrantFiled: June 14, 1988Date of Patent: October 31, 1989Assignee: Birmingham Bolt Company, Inc.Inventor: Claude C. White
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Patent number: 4859118Abstract: A mine roof support anchor and process for installing the same. The anchor comprises a pair of wedge members, each of which has tapered surfaces adapted for interengagement to effect expansion of the shell into gripping engagement with the mine roof. The wedge members are joined by a connector at one end thereof. Upon threading the roof bolt through one wedge member, the upper end of the bolt engages the connector, thereby effecting upper movement of the other wedge member and downward movement of the one wedge member, causing rapid expansion of the shell. External ribs on one of the wedge members engage the mine roof after partial expansion of the shell to limit upward movement of the wedge member. A vertical rib on the wedge member through which the roof bolt is threaded prevents rotation thereof during the rotation of the bolt through the anchor.Type: GrantFiled: June 21, 1988Date of Patent: August 22, 1989Assignee: Birmingham Bolt Company, Inc.Inventor: Charles W. Schaeffer
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Patent number: 4764055Abstract: A resin reinforced expansion anchor system for a mine roof support bolt or the like utilizes a specially configured, thin-walled expansion shell together with a thin-walled, dual-taper plug for expanding the shell. The shell and the plug cooperate to implement a particularly desirable type of mechanical expansion anchoring action while simultaneously providing a symmetrical array of resin flow passages at circumferentially spaced locations about the anchor assembly to permit proper distribution and flow of a quick setting resin mix. The system of the invention enables a relatively large diameter rock bolt or threaded bar to be securely anchored in a blind drilled hole that is of relatively small diameter, with the anchoring action of a mechanical expansion anchor assembly being desirably augumented by the anchoring action of a concurrently established resin bond.Type: GrantFiled: September 23, 1987Date of Patent: August 16, 1988Assignee: Birmingham Bolt Company, Inc.Inventors: Carl A. Clark, Raymond L. Wright
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Patent number: 4749310Abstract: A mine roof truss including opposed angularly disposed roof bolts, a horizontal truss member extending between the roof bolts, and couplings connecting the roof bolts to the truss member. Each coupling comprises a housing having walls forming a cavity into which the head of the roof bolt and an end of the truss member are inserted and secured. The end of the truss member is provided with a T-shaped head which is inserted through a slot in the housing wall leading to the cavity, following which the truss member is rotated relative to the housing to lock the truss member to the coupling. The roof bolt head and truss member are pivotally connected with the coupling to permit adjustments thereof when installed on an uneven roof surface.Type: GrantFiled: September 30, 1986Date of Patent: June 7, 1988Assignee: Birmingham Bolt Company, Inc.Inventor: Claude C. White
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Patent number: 4556344Abstract: A combination expansion shell and resin secured mine roof anchor assembly comprising an elongated bolt which carries rebar and an expansion shell. The assembly is inserted into a mine roof opening, in the back end of which is positioned a resin and catalyst cartridge. The cartridge is ruptured by the assembly allowing the resin and catalyst to gravitate downwardly, where they are mixed together by the rebar upon rotation of the bolt. The bolt is rotated a predetermined number of revolutions to obtain proper mixing of the resin and catalyst preparatory to setting, after which the continued rotation of the bolt in the same direction effects movement of the expansion shell into gripping engagement with the mine roof.Type: GrantFiled: February 13, 1984Date of Patent: December 3, 1985Assignee: Birmingham Bolt CompanyInventor: Claude C. White
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Patent number: 4534680Abstract: A combination expansion shell and resin secured anchor assembly for installation in a mine roof opening including an elongated bolt having rebar attached to the upper end thereof and an expansion shell below the rebar. The assembly is inserted into a mine roof opening in the back end of which is positioned a resin and catalyst cartridge, the cartridge being ruptered by the rebar, allowing the resin and catalyst to gravitate downwardly between the opening wall and rebar, where they are mixed upon rotation of the bolt and rebar. The bolt is rotated a predetermined number of revolutions to obtain optimum mixing of the resin and catalyst, after which continued rotation of the bolt in the same direction causes outward movement of the expansion shell into gripping engagement with the mine roof.Type: GrantFiled: November 1, 1984Date of Patent: August 13, 1985Assignees: Birmingham Bolt Company, Jim Walter Resources, Inc.Inventors: Claude C. White, Frederick Carr
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Patent number: 4534679Abstract: A combination expansion shell and resin secured anchor assembly for installation in a mine roof opening including an elongated bolt having rebar attached to the upper end thereof and an expansion shell below the rebar. The assembly is inserted into a mine roof opening in the back end of which is positioned a resin and catalyst cartridge, the cartridge being ruptured by the rebar, allowing the resin and catalyst to gravitate downwardly between the opening wall and rebar, where they are mixed upon rotation of the bolt and rebar. The bolt is rotated a predetermined number of revolutions to obtain optimum mixing of the resin and catalyst, after which continued rotation of the bolt in the same direction causes outward movement of the expansion shell into gripping engagement with the mine roof.Type: GrantFiled: November 1, 1984Date of Patent: August 13, 1985Assignees: Birmingham Bolt Company, Jim Walter Resources, Inc.Inventors: Claude C. White, Frederick Carr
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Patent number: 4483645Abstract: A combination expansion shell and resin secured anchor assembly for installation in a mine roof opening including an elongated bolt having rebar attached to the upper end thereof and an expansion shell below the rebar. The assembly is inserted into a mine roof opening in the back end of which is positioned a resin and catalyst cartridge, the cartridge being ruptured by the rebar, allowing the resin and catalyst to gravitate downwardly between the opening wall and rebar, where they are mixed upon rotation of the bolt and rebar. The bolt is rotated a predetermined number of revolutions to obtain optimum mixing of the resin and catalyst, after which continued rotation of the bolt in the same direction causes outward movement of the expansion shell into ripping engagement with the mine roof.Type: GrantFiled: February 16, 1982Date of Patent: November 20, 1984Assignee: Birmingham Bolt CompanyInventors: Claude C. White, Frederick Carr
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Patent number: 4437795Abstract: A mine roof anchor assembly comprising an elongated bolt, one end of which is threadedly engaged with an expansion anchor. The expansion anchor includes a cone nut threaded on the bolt which moves axially through a shell for expanding the latter into gripping engagement with the mine roof. A bail member of inverted L-shape is connected to, and extends upwardly from, the expansion shell, a portion of the bail member overlying the cone nut to limit the relative longitudinal movement of the bolt when it is rotated in the cone nut. That portion of the bail member overlying the bolt is deflected by the latter to urge teeth mounted on the bail member portion into impinging engagement with the mine roof.Type: GrantFiled: November 2, 1981Date of Patent: March 20, 1984Assignee: Birmingham Bolt CompanyInventor: Claude C. White
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Patent number: 4347020Abstract: A mine roof bolt assembly including a shank having anchoring means at one end for securing the shank in the back of the bore, the opposite end of the shank being threaded. A bolt head having a central bore, includes a first threaded bore portion threadedly engaged with the threaded end of the shank. A stop plug is threaded into a second threaded bore portion in the bolt head and abuts an end of the shank to initially limit penetration of the shank into the bore of the head. The bolt head is rotated by rotational means having a predetermined torque limit, moving the head longitudinally with respect to the shank, exerting a force on the stop plug which strips the threads from the second threaded bore portion, thereby permitting uninterrupted passage of the shank through the bore. A roof plate positioned on the shank between the bolt head and roof is then forced upwardly by the head into supporting engagement with the mine roof, and the predetermined torque of the rotational means is established.Type: GrantFiled: January 2, 1980Date of Patent: August 31, 1982Assignees: Birmingham Bolt Company, Jim Walter Resources, Inc.Inventors: Claude C. White, Frederick Carr
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Patent number: 4342527Abstract: This is a support assembly for underground mine and tunnel roofs. The assembly includes a tubular member comprising two opposed semi-cylindrical portions, the opposed longitudinal edges on one side of the member being connected together. Portions of the edges on the opposite side of the member are provided with one or more complemental mating angular recesses, which together form a tapered opening in the tubular wall for receiving wedge members. A ram successively engages the wedge members to force the same through the tapered opening, to effect expansion of the tubular member into bonding engagement with the roof.Type: GrantFiled: July 10, 1980Date of Patent: August 3, 1982Assignee: Birmingham Bolt CompanyInventor: Claude C. White