Hammer drill

Details Hammer drill Hammer drill

1980-09-18

1983-01-04

Reynolds, Wm. Carter

Tool driving or impacting

Impacting devices

With means for rotating tool

173 48, 173118, 173122, 74 22R, B23B 4516

Patent

active

043668690

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.

REFERENCES:
patent: 3828863 (1974-08-01), Bleicher et al.
patent: 3874460 (1975-04-01), Schmid et al.
patent: 4064949 (1977-12-01), Chromy

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