Title:
【発明の名称】削岩機の打撃穿孔頂部
Document Type and Number:
Japanese Patent JPS62502269
Kind Code:
A
Abstract:
PCT No. PCT/DE86/00097 Sec. 371 Date Nov. 13, 1986 Sec. 102(e) Date Nov. 13, 1986 PCT Filed Mar. 8, 1986 PCT Pub. No. WO86/05542 PCT Pub. Date Sep. 25, 1986.Percussion drill bit for rock perforators is provided whose frontal face is covered by a plurality of hard-metal studs, whereby a plurality of studs are positioned to form a group, there being several of these groups present and each of the so-called groups being at a distance from one another at least circumferentially and separated through circulation-medium channels, and further provided with at least one axial center channel located roughly in a center of the frontal face and opening into the circulation-medium channels, characterized in that each group consists of only one row of studs (1) arranged on sloped protruding drilling facets (4), in that the drilling facets (4) run against the rotation direction (A) of the drill bit, at an angle with respect to the radius, and in that the circulation-medium channels (2) formed in the frontal face widen starting from the center of the drill bit, radially towards the outside.
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Inventors:
Treats, Jug Free
Application Number:
JP50158186A
Publication Date:
September 03, 1987
Filing Date:
March 08, 1986
Export Citation:
Assignee:
Treats, Jug Free
International Classes:
E21B10/36; E21B10/00; E21B10/38; E21B10/56; E21B; (IPC1-7): E21B10/36
Attorney, Agent or Firm:
Osamu Nakahira