Document Type and Number:
Japanese Patent JPS6319314
Kind Code:
B2
Abstract:
A hammer drill is arranged to rotate and also apply percussive force to a tool receptacle. The percussive force is transmitted from a shaft to a drive piston which, in turn, reciprocates a percussion piston which drives the tool receptacle. The hammer drill includes a housing and a bearing rotatably mounted in the housing. The shaft is rotatably mounted in the bearing and its axis extends perpendicularly of the axis of rotation of the bearing. The bearing supports a contact rim which is in meshed engagement with the shaft. The contact rim is displaceably into frictional contact with a brake member for holding the contact rim against rotation while the bearing rotates carrying with it the shaft. Due to its meshed engagement with the contact rim, the shaft rotates about its own axis causing the drive piston to reciprocate.
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Inventors:
RORUFU BERAITERU
FURANTSU KIROMII
FURANTSU KIROMII
Application Number:
JP12412880A
Publication Date:
April 22, 1988
Filing Date:
September 09, 1980
Export Citation:
Assignee:
HILTI AG
International Classes:
B25D11/12; B23B45/16; B25D11/00; B25D16/00; B25D17/10; E21B1/00; E21B1/12; E21B1/16; E21B6/06; B25D11/10