GB1257285A - - Google Patents

Info

Publication number
GB1257285A
GB1257285A GB1564870A GB1257285DA GB1257285A GB 1257285 A GB1257285 A GB 1257285A GB 1564870 A GB1564870 A GB 1564870A GB 1257285D A GB1257285D A GB 1257285DA GB 1257285 A GB1257285 A GB 1257285A
Authority
GB
United Kingdom
Prior art keywords
striker
housing
making
sssr
expanders
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1564870A
Other languages
English (en)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Publication of GB1257285A publication Critical patent/GB1257285A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/28—Enlarging drilled holes, e.g. by counterboring
    • E21B7/30—Enlarging drilled holes, e.g. by counterboring without earth removal

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
GB1564870A 1970-04-02 1970-04-02 Expired GB1257285A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1564870 1970-04-02

Publications (1)

Publication Number Publication Date
GB1257285A true GB1257285A (fr) 1971-12-15

Family

ID=10062924

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1564870A Expired GB1257285A (fr) 1970-04-02 1970-04-02

Country Status (1)

Country Link
GB (1) GB1257285A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2824915A1 (de) * 1978-06-07 1979-12-20 Paul Schmidt Verfahren zum herstellen von beiderseits offenen erdbohrungen
GB2305383A (en) * 1995-09-25 1997-04-09 Earth Tool Company Pulling device for removing an expander from a boring tool

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2824915A1 (de) * 1978-06-07 1979-12-20 Paul Schmidt Verfahren zum herstellen von beiderseits offenen erdbohrungen
GB2305383A (en) * 1995-09-25 1997-04-09 Earth Tool Company Pulling device for removing an expander from a boring tool

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years