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JPS5640953Y2 |
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JPS56501377A |
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JPS5638758B2 |
In a hydraulic percussion rock drill the operation of the working fluid distributing valve is controlled to effect a variation in percussive blow energy and blow frequency by varying the piston hammer stroke. Actuation of the distributin...
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JPS56116492U |
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JPS56116496U |
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JPS5637033Y2 |
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JPS56105556U |
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JPS5631536B2 |
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JPS5629436Y2 |
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JPS5627680B2 |
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JPS5626042Y2 |
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JPS5623435Y2 |
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JPS5664082A |
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JPS5651886U |
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JPS5615270Y2 |
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JPS5631986A |
A pneumatically operated self- propelled ram boring device 2 for boring a hole 8 in the ground is supplied with compressed air through a hose 4 from a mobile compressor unit 6. The unit 6 comprises a compressor 18 driven by a motor 16 an...
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JPS5613594B2 |
1383720 Percussive tools ATLAS COPCO AB 2 July 1973 [30 June 1972] 31369/73 Heading B4C [Also in Divisions F2 and B3] A hammer device comprises a crankshaft 2 having a combustion engine piston 25 and a compressor piston 3 for driving a h...
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JPS56500329A |
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JPS569636B2 |
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JPS56500207A |
In a cylinder formed in a casing a hammer piston is mounted for reciprocating motion and is subjected to periodic pressure pulses from a pressure fluid. To prevent a reaction emanating from each pressure pulse from also acting as a shock...
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JPS5620296A |
A mining or excavating machine has a plurality of hydraulic receivers, such as hydraulic jacks or hydraulic motors, associated with a respective electrically operated valves 21 each controlling the supply of hydraulic fluid to and the re...
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JPS566474B2 |
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JPS567681U |
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JPS5543866B2 |
A striking apparatus has a body which carries a tool and which has a cylinder space, a piston structure within the space, and a sleeve-type distributor valve within the cylinder and around the piston. Flow of hydraulic fluid supplied to ...
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JPS5543864B2 |
A hydraulic percussion tool for developing repeated impact blows for rock drilling and other high force applications is characterized by a piston hammer reciprocably disposed in a cylinder bore and a tubular valve member coaxial with and...
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JPS5543865B2 |
In a hydraulic striking device having a reciprocating piston there are first and second cylindrical spaces surrounding the piston, the first space continuously communicating with a high pressure circuit and the second space alternately c...
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JPS5530106B2 |
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JPS5527742Y2 |
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JPS5527741Y2 |
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JPS5525724Y2 |
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JPS5524232Y2 |
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JPS5524233Y2 |
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JPS5517199B2 |
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JPS5554187A |
A demolition tool for breaking solid materials, particularly rock or concrete in tunnelling, mining, demolishing and excavating applications. The tool has a single impactor (1) of projectile type which is driven by high pressure liquid t...
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JPS5513269B2 |
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JPS5512958B2 |
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JPS5511197B2 |
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JPS5540005U |
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JPS559997B2 |
Pneumatic pick for mines or construction work has a drill rotor, pistons with freewheel coupling and screw pair so as to divide the housing into action spaces. One piston strikes against the drill steel and the piston which works with th...
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JPS5510477Y2 |
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JPS557911B2 |
A hydraulic rock drill having a hydraulic drill drive motor, a hydraulic feed motor, and a hydraulic impact unit and associated pumps for supplying hydraulic fluid under pressure and provided with an automatic control system including a ...
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JPS557514B1 |
A borer comprises a hammer, a spindle connected to rotate with a rotatable table, and a vibrator connected between the hammer and a support for vibrating the hammer. The spindle is free to rotate with respect to the support. A flexible c...
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JPS5528672U |
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JPS5518395A |
In a hammer drill, a drive piston is reciprocated by a motor, and, over a pneumatic buffer, the reciprocating motion is transmitted to a percussion piston. A throttle valve regulates the flow of a fuel mixture to the motor for controllin...
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JPS554915B2 |
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JPS554554B2 |
The intention is to be able to reduce the wear and permit easier starting. The percussion apparatus has a housing (1) to which a tool can be fastened. A piston (27) with a head (4) is axially movable in a reciprocating manner in a cylind...
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JPS5439441Y2 |
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JPS5433625B2 |
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JPS5432991B2 |
An hydraulically operated striking apparatus for driving a rock drill or the like comprises a body having an axial, generally cylindrical, interior space with an inwardly protruding annular member. A cylindrical piston is positioned in t...
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JPS5432987B2 |
1460556 Impact tools HYDROACOUSTICS Inc 17 April 1975 [24 April 1974] 15893/75 Heading B4C A hydraulic pressure tool comprises a housing 300, a bore 308 therein and a piston 310 in the bore, the piston having faces 326, 328 the face 326 ...
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