Title:
HAMMER DRILL
Document Type and Number:
Japanese Patent JPS5518395
Kind Code:
A
Abstract:
In a hammer drill, a drive piston is reciprocated by a motor, and, over a pneumatic buffer, the reciprocating motion is transmitted to a percussion piston. A throttle valve regulates the flow of a fuel mixture to the motor for controlling its operation. A membrane switch connected to and operated by the pressure conditions within the pneumatic buffer controls the throttle valve.
Inventors:
FURANTSU KUROMII
Application Number:
JP9102179A
Publication Date:
February 08, 1980
Filing Date:
July 19, 1979
Export Citation:
Assignee:
HILTI AG
International Classes:
B25D9/10; E21C37/22; B25D11/00; B25D11/12; E21B1/30; E21B1/34; E21B1/38; (IPC1-7): B25D16/00