Title:
【発明の名称】めくら穴のアンダカット用穴あけ装置
Document Type and Number:
Japanese Patent JP2572061
Kind Code:
B2
Abstract:
A bit assembly for undercutting a blind bore extending along a bore axis between an open outer end and a closed inner end and having a substantially cylindrical wall of a predetermned diameter centered on the bore axis and extending between the ends comprises a pusher body normally seated in the closed inner end of the bore and having an outwardly turned camming surface inclined to the bore axis, and a bit having a shaft extending along a longitudinal bit axis and having an inner end, an outer end, and a pair of longitudinally extending sides terminating at the inner end. One of the sides is at least partially cylindrical and centered on the bit axis and the inner end is formed with a camming surface engageable with the camming surface of the body and inclined to the bit axis. A blade fixed permanently and stationarily on the inner end projects radially from the one side of the shaft, the other side being cut back toward the bit axis.
Inventors:
KAARU AISHAIDO
Application Number:
JP9295287A
Publication Date:
January 16, 1997
Filing Date:
April 15, 1987
Export Citation:
Assignee:
KAARU AISHAIDO
International Classes:
B28D1/14; B23B29/034; B23B31/08; B23B41/06; B23B51/00; B25G3/38; E21B7/08; E21B10/26; F16D3/20; (IPC1-7): B28D1/14
Domestic Patent References:
| JP58155113A | ||||
| JP61135709A |
Attorney, Agent or Firm:
Morio Sada (1 outside)