GB239776A - Improvements in or relating to stone drills - Google Patents

Improvements in or relating to stone drills

Info

Publication number
GB239776A
GB239776A GB369325A GB369325A GB239776A GB 239776 A GB239776 A GB 239776A GB 369325 A GB369325 A GB 369325A GB 369325 A GB369325 A GB 369325A GB 239776 A GB239776 A GB 239776A
Authority
GB
United Kingdom
Prior art keywords
cutting edge
tool
curved ledges
blows
stone
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
GB369325A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB369325A priority Critical patent/GB239776A/en
Publication of GB239776A publication Critical patent/GB239776A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/26—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by impact tools, e.g. by chisels or other tools having a cutting edge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D3/00—Hand chisels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/72—Stone, rock or concrete
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/105—Exchangeable tool components
    • B25D2250/111—Bits, i.e. inserts or attachments for hammer, chisel, pick
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/305—Twisted part of a chisel or percussive non-drilling tool bit

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Drilling Tools (AREA)

Abstract

239,776. Feldmar, A. B. Feb. 10, 1925. Percussive hand tools.-The leading parts 5 of the cutting edge 3 of a stone &c. drill of the type manipulated by a series of hammer blows are provided at the rear along the edges of the clearance grooves 4 with outwardly curved ledges 8 to prevent wedging of the tool in the drill hole, thereby enabling the tool to be easily rotated between the blows. These curved ledges extend beyond the centre of the cutting edge, and diminish gradually in width. The recoil effect produced by the curved ledges 8 may be increased by grinding the trailing parts 6 of the cutting edge somewhat concave.
GB369325A 1925-02-10 1925-02-10 Improvements in or relating to stone drills Expired GB239776A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB369325A GB239776A (en) 1925-02-10 1925-02-10 Improvements in or relating to stone drills

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB369325A GB239776A (en) 1925-02-10 1925-02-10 Improvements in or relating to stone drills

Publications (1)

Publication Number Publication Date
GB239776A true GB239776A (en) 1925-09-17

Family

ID=9763165

Family Applications (1)

Application Number Title Priority Date Filing Date
GB369325A Expired GB239776A (en) 1925-02-10 1925-02-10 Improvements in or relating to stone drills

Country Status (1)

Country Link
GB (1) GB239776A (en)

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