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JPH0455087Y2 |
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JPH0477115B2 |
PURPOSE:To reduce the size of a well sinking machine by stretching a chain for moving a drill rod up and down across a guide frame and a drive unit therefor and a rotary unit for rod thereby enabling drilling and intermittent dropping th...
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JPH0477116B2 |
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JPH0475354B2 |
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JPH0473517B2 |
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JPH0449270Y2 |
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JPH0449271Y2 |
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JPH0447275Y2 |
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JPH0447272Y2 |
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JPH0447276Y2 |
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JPH04122477U |
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JPH0465198B2 |
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JPH0463165B2 |
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JPH0439919Y2 |
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JPH04231702A |
PURPOSE: To automatically operate an additional motor in response to the increase of load without generating time delay. CONSTITUTION: When a hydraulic main load motor M1 drives a load, the operating pressure to be generated inside there...
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JPH04221190A |
PURPOSE: To mount and demount a boring rod by holding the lower part rod of the upper and lower boring rods which are screwed by a screw by hydraulic means and installing a holding means on the upper rod which is raised and lowered and i...
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JPH04221188A |
PURPOSE: To improve the workability of a boring device and reduce the execution cost by installing penetration devices on both the sides of a frame and installing a rotary device on the frame and spreading the diameter of a precedingly d...
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JPH0448159B2 |
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JPH0448158B2 |
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JPH0447757B2 |
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JPH0484490U |
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JPH0428958Y2 |
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JPH0441755B2 |
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JPH0441752B2 |
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JPH0438242B2 |
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JPH0423987Y2 |
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JPH0457583U |
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JPH0428877B2 |
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JPH04131492A |
PURPOSE: To make compatible the improvement in the excavation efficiency of soil and safety by simple facilities by spraying compressed air against the surface of the soil of the peripheral section of an excavated pit while pushing and d...
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JPH0417657Y2 |
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JPH0441583U |
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JPH04501446A |
PCT No. PCT/EP90/01353 Sec. 371 Date Apr. 23, 1991 Sec. 102(e) Date Apr. 23, 1991 PCT Filed Aug. 17, 1990 PCT Pub. No. WO91/02880 PCT Pub. Date Mar. 7, 1991.A drilling device including a hydraulically actuated drive for exerting an oscil...
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JPH0430133U |
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JPH047243Y2 |
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JPH049915B2 |
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JPH0449396A |
PURPOSE: To miniaturize a machine and reduce cost by fitting an external casing with a bit at the external main shaft of an auger machine and an auger screw with a bit at the internal main shaft respectively, and rotating the two to the ...
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JPH042156B2 |
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JPH03128786U |
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JPH0348283Y2 |
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JPH0393893U |
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JPH0344824Y2 |
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JPH0360606B2 |
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JPH03191195A |
PURPOSE: To reduce the occupying area of a device by forming a type of four- parts link by the upper arm, one part of lower arm, connecting rod and mast intermediate section of an earth auger device and approaching and separating a leade...
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JPH0336632Y2 |
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JPH03176589A |
PURPOSE: To facilitate the work by a method wherein a conduit is held with a chuck interlocking with a rotary driving device that is attached to the front end of an arm of a machine such as hydraulic crane and the conduit is embed ded in...
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JPH0348316B2 |
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JPH03140591A |
PURPOSE: To prevent the bending of pit excavated as well as form a given free face by a method in which a guide bar is inserted into a preceding pit excavated in a rockbed, and connecting pits are excavated at both sides of the preceding...
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JPH0358387U |
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JPH03125785A |
PURPOSE: To permit a stright pit to be excavated by a method in which an auter casing is turned in the first direction, and an inner rod in the casing is turned in the second direction as the opposite direction to the first direction to ...
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JPH0324707Y2 |
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