FR2245449A1 - Pneumatically driven hammer drill - has sleeve forming exhaust passage and secured at both ends - Google Patents

Pneumatically driven hammer drill - has sleeve forming exhaust passage and secured at both ends

Info

Publication number
FR2245449A1
FR2245449A1 FR7335091A FR7335091A FR2245449A1 FR 2245449 A1 FR2245449 A1 FR 2245449A1 FR 7335091 A FR7335091 A FR 7335091A FR 7335091 A FR7335091 A FR 7335091A FR 2245449 A1 FR2245449 A1 FR 2245449A1
Authority
FR
France
Prior art keywords
secured
sleeve
exhaust passage
hammer drill
pneumatically driven
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.)
Granted
Application number
FR7335091A
Other languages
French (fr)
Other versions
FR2245449B1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DIEVAL RECTIFICATION AUTO
Original Assignee
DIEVAL RECTIFICATION AUTO
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 by DIEVAL RECTIFICATION AUTO filed Critical DIEVAL RECTIFICATION AUTO
Priority to FR7335091A priority Critical patent/FR2245449A1/en
Publication of FR2245449A1 publication Critical patent/FR2245449A1/en
Application granted granted Critical
Publication of FR2245449B1 publication Critical patent/FR2245449B1/fr
Granted 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
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • E21B4/14—Fluid operated hammers
    • E21B4/145—Fluid operated hammers of the self propelled-type, e.g. with a reverse mode to retract the device from the hole

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Drilling And Boring (AREA)

Abstract

The upper part (21) of the hammer is screwed onto the lower part (311) and tapers to a tool point with a projecting tip which has a morse cone end embedded in the point. Compressed air is fed axially to a first chamber (161) and along a hollow piston. Air escapes around the end of the piston into an annular space before passing through openings (131) in the cylinder. The openings lead to an annular space (121) defined by a sleeve (55) secured to the outside of the cylinder. The sleeve is correctly positioned by a lower plug (56) which defines exhaust openings (57) with the sleeve.
FR7335091A 1973-09-27 1973-09-27 Pneumatically driven hammer drill - has sleeve forming exhaust passage and secured at both ends Granted FR2245449A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7335091A FR2245449A1 (en) 1973-09-27 1973-09-27 Pneumatically driven hammer drill - has sleeve forming exhaust passage and secured at both ends

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7335091A FR2245449A1 (en) 1973-09-27 1973-09-27 Pneumatically driven hammer drill - has sleeve forming exhaust passage and secured at both ends

Publications (2)

Publication Number Publication Date
FR2245449A1 true FR2245449A1 (en) 1975-04-25
FR2245449B1 FR2245449B1 (en) 1978-03-17

Family

ID=9125779

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7335091A Granted FR2245449A1 (en) 1973-09-27 1973-09-27 Pneumatically driven hammer drill - has sleeve forming exhaust passage and secured at both ends

Country Status (1)

Country Link
FR (1) FR2245449A1 (en)

Also Published As

Publication number Publication date
FR2245449B1 (en) 1978-03-17

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Legal Events

Date Code Title Description
ST Notification of lapse