GB1362292A - Rock drills - Google Patents

Rock drills

Info

Publication number
GB1362292A
GB1362292A GB4988971A GB4988971A GB1362292A GB 1362292 A GB1362292 A GB 1362292A GB 4988971 A GB4988971 A GB 4988971A GB 4988971 A GB4988971 A GB 4988971A GB 1362292 A GB1362292 A GB 1362292A
Authority
GB
United Kingdom
Prior art keywords
cylindrical portion
grooves
drill
cutting element
previously cylindrical
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
GB4988971A
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.)
Reinholdt A S
Original Assignee
Reinholdt A S
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 Reinholdt A S filed Critical Reinholdt A S
Publication of GB1362292A publication Critical patent/GB1362292A/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
    • E21B10/00—Drill bits
    • E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
    • E21B10/445—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts percussion type, e.g. for masonry

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Earth Drilling (AREA)
  • Drilling Tools (AREA)

Abstract

1362292 Twist drills H REINHOLDT AS 27 Oct 1971 [25 Nov 1970] 49889/71 Heading B3C [Also in Division B4] A rotary-percussive drill comprises a shank 2, a hard metal cutting element 6 and a pair of helical discharge grooves 8, 9 cut from a previously cylindrical portion 4. The surfaces 10, 11, which guide the drill in use, widen, adjacent the cutting element, to substantially a quarter of the circumference of the previously cylindrical portion. The core of the drill enveloped by the grooves is preferably a cylinder having a diameter greater than half the diameter of the previously cylindrical portion. The grooves may alternatively have the form illustrated in Fig. 3.
GB4988971A 1970-11-25 1971-10-27 Rock drills Expired GB1362292A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702057892 DE2057892A1 (en) 1970-11-25 1970-11-25 Rock drill bits for impact drills

Publications (1)

Publication Number Publication Date
GB1362292A true GB1362292A (en) 1974-08-07

Family

ID=5789029

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4988971A Expired GB1362292A (en) 1970-11-25 1971-10-27 Rock drills

Country Status (7)

Country Link
AT (1) AT313220B (en)
CH (1) CH525753A (en)
DE (1) DE2057892A1 (en)
FR (1) FR2115828A5 (en)
GB (1) GB1362292A (en)
IT (1) IT941107B (en)
NL (1) NL7114401A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7137461B2 (en) 2002-10-03 2006-11-21 Black & Decker, Inc. Masonry drilling tool

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH626557A5 (en) * 1978-09-28 1981-11-30 Guex Philippe & Fils Sa
DE3014693A1 (en) * 1980-04-16 1981-10-22 Hilti AG, 9494 Schaan ROCK DRILL
DE4338667A1 (en) * 1993-11-12 1995-05-18 Hilti Ag Drilling tool
US5641028A (en) * 1995-08-10 1997-06-24 Black & Decker Inc. Drill bit with debris conveying flute

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7137461B2 (en) 2002-10-03 2006-11-21 Black & Decker, Inc. Masonry drilling tool

Also Published As

Publication number Publication date
FR2115828A5 (en) 1972-07-07
NL7114401A (en) 1972-05-29
CH525753A (en) 1972-07-31
AT313220B (en) 1974-02-11
DE2057892A1 (en) 1972-06-08
IT941107B (en) 1973-03-01

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Legal Events

Date Code Title Description
PS Patent sealed
433D Application made for revocation (sect. 33/1949)
434A Offer to surrender (sect. 34/1949)
4336 Case decided by the comptroller ** application not proceeded with (sect. 33/1949)
434F Withdrawal of offer to surrender allowed (sect. 34/1949)
PLNP Patent lapsed through nonpayment of renewal fees