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Title:
PORTABLE HANDHELD DRILLING APPARATUS
Document Type and Number:
Japanese Patent JP3049177
Kind Code:
B2
Abstract:

PURPOSE: To avoid the defect of possibility that turning moment is increased suddenly by the sudden lowering of the number of revolution of a drill and the gluing of the drill when the drill collides with a resistor in a bored hole, and to surely eliminate a danger existing in a known drilling apparatus by a simple structural means.
CONSTITUTION: A release lever 2 and a brake device operation-coupled with the lever 2 are installed to the drilling apparatus. When the release lever 2 is operation-coupled with the brake device as follows-that is, when the unwanted rotational movement of the drilling apparatus by encountering to a drilling resistance of a drill 18 reaches a previously imparted critical value, the release lever 2 releases the brake device.


Inventors:
Klaus Martin Wool
Hans Nickel
Application Number:
JP18414193A
Publication Date:
June 05, 2000
Filing Date:
July 26, 1993
Export Citation:
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Assignee:
Andreas Sheutair
International Classes:
E21B3/02; E21B1/34; E21B3/035; E21B7/00; E21B11/00; E21B44/00; E21B44/04; (IPC1-7): E21B7/00; E21B3/02
Domestic Patent References:
JP486858B1
Attorney, Agent or Firm:
Takehisa Ito (1 outside)



 
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