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US 4,005,811 AGranted
Roof bolt injection mast
AssigneeAustralian Iron & Steel Proprietary Limited
InventorJohn Francis Garaty
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AssigneeAustralian Iron & Steel Proprietary Limited
InventorJohn Francis Garaty
Estimating the term…
This invention relates to a roof bolt injection mast comprising an elongate member having a length slightly less than the height from the floor to the roof of a tunnel or gallery in which the mast is to be operated, the elongate member being provided with a passage which extends therethrough from one end to the other and a port extending through the sidewall thereof to communicate with the said passage, a portion of the passage extending from the lower end of the member to the point of communication with the port being enlarged whereby a fluid introduced through said port will provide the means whereby a first piston disposed in the enlarged portion of the passage is operable to lock the mast between the floor and the ceiling while a second piston disposed in the main passage provides the means whereby a roof bolt disposed therein will be injected into the roof under the influence of the fluid introduced through the port.
A roof bolt injection mast comprising an elongate member having upper and lower ends, passage means extending through said member from end to end, a first piston disposed in a portion of said passage means at the lower end thereof, high pressure fluid inlet means communicating with said passage means adjacent the upper end of said first piston, and means providing for relative movement between said member and said first piston under the influence of a high pressure fluid introduced through said inlet means;
An injection mast for injecting a roof bolt into the roof of a tunnel, comprising elongate body means having passage means extending therethrough from end to end to receive roof bolt means, an enlarged portion at the lower end of said passage means, a first piston disposed in said passage means, a second piston disposed in said enlarged portion and means defining a fluid inlet zone between said pistons whereby upon supply of fluid introduced at said zone at a high pressure said second piston will move away from said first piston to lock said mast between the floor and the roof of the tunnel and said first piston will then move away from said second piston to drive roof bolt means from said passage means into the roof of said tunnel.
A roof bolt injection mast comprising an elongate body for positioning in an upright position in a tunnel or the like, a passage means extending through said body from end to end, an upper portion of said passage means being arranged to receive a a roof bolt therein, a lower portion of said passage means being larger in diameter than said upper portion and having a piston therein, said piston being operable under the influence of a high pressure fluid introduced into said passage means through fluid inlet means to lock said mast between the roof and the floor of said tunnel, said fluid being operable to eject a roof bolt from said passage means into said roof.
Dependencies are inferred from the claim text.