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Title:
RAM DRILLING APPARATUS EQUIPPED WITH IMPACT CUTTER PISTON
Document Type and Number:
Japanese Patent JPS6272884
Kind Code:
A
Abstract:
In a ram boring machine for laying pipelines without trenching, a double blade that is axially moveable against a compression spring is housed in an impact tip and projects through slots in the impact tip. The double blade is struck by a striker piston and moves, during the breaking-up of an old pipe laid in the ground, substantially independently of the ram boring machine or of its housing. In this way substantially all the impact energy of the piston is used for the benefit of the breaking-up operation.

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Inventors:
HERUMUUTO ROOMAA
Application Number:
JP22576786A
Publication Date:
April 03, 1987
Filing Date:
September 24, 1986
Export Citation:
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Assignee:
TORAKUTOOTECHNIC PAURU SHIYUMI
International Classes:
E21B4/06; E21B7/26; E21B7/20; E21B7/28; E21B7/30; E21B10/40; E21B29/10; F16L55/165; (IPC1-7): E21B7/26
Domestic Patent References:
JPS5282814A1977-07-11
Foreign References:
US4505302A1985-03-19
Attorney, Agent or Firm:
Honda Kodaira (2 outside)



 
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