Tool driving or impacting – Impacting devices – With anvil arranged to transmit torsional impact to tool
Patent
1998-12-04
2000-03-14
Smith, Scott A.
Tool driving or impacting
Impacting devices
With anvil arranged to transmit torsional impact to tool
173104, 173205, 173213, 173216, 173171, B23B 4500
Patent
active
060359471
ABSTRACT:
A primary shaft locking device of an electromotive tool is disclosed. A plurality of braking blocks are installed with a plurality of axially projected supporting pieces and a plurality of radially projected nose portions. An output shaft is installed within the receiving hole and a cam is installed in one end of the output shaft so that the cam is rotated synchronously with the output shaft. Furthermore, a driving disk attached to a speed changing gear set is installed, the disk surface of which is installed with a plurality of convex blocks having a fan shape. These convex blocks is matched with the fixing seat, and is arranged between the two supporting pieces installed on the braking blocks. Thereby, when the rotary is driven to rotate, at first, the convex block will rotate the supporting pieces in order that the braking block release from braking condition so as to drive the output shaft, the cam and the braking block to rotate at the same time. While when the driving disk is stopped, since the output shaft is rotated in the reverse direction, the cam will drive the convex portion of the braking blocks, thus a friction force will induce between the braking block and the inner wall of the fixing seat, thereby, the fixing seat is firmly fixed.
REFERENCES:
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patent: 4619162 (1986-10-01), Van Leare
patent: 5083619 (1992-01-01), Giardino et al.
patent: 5538089 (1996-07-01), Sanford
patent: 5908076 (1999-01-01), Marcengill et al.
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