Percussion driver drill, and a changeover mechanism for changing

Details Percussion driver drill, and a changeover mechanism for changing Percussion driver drill, and a changeover mechanism for changing

2000-02-14

2000-11-07

Smith, Scott A.

Tool driving or impacting

Drive adjustable to completely change kind of drive

Adjustable to impacting device

173216, B25B 23159

Patent

active

061422428

ABSTRACT:
A pair of stoppers (47) capable of moving back and forth in an axial direction of a spindle (5) are provided on an outer periphery of a tubular portion (9a) for supporting the spindle (5). As a pair of projections (49) provided on a first change ring (32) are moved in conjunction with the rotation of the first change ring (32) which is capable of changing over the operating mode of a percussion driver drill, the stoppers (47) move back and forth in the axial direction. During a percussion mode and a drill mode, the stoppers (47) abut against a flat washer (50) for fixing an internal gear (13) to restrict the forward movement of the flat washer (50), while, during a clutch mode provided in the first change ring (32) as a third changeover position, the stoppers (47) move away from the flat washer (50). A pair of washers (40, 41) superposed on each other in the axial direction of the spindle (5) are interposed between the first change ring (32) and a second change ring (39). The washer (40) has a click (45) capable of engaging in one of recesses (59) formed in the first change ring (32). The washer (41) has a click (46) capable of engaging in one of recesses (58) formed in the second change ring (39).

REFERENCES:
patent: 4274304 (1981-06-01), Curtiss
patent: 5339908 (1994-08-01), Yokota et al.
patent: 5458206 (1995-10-01), Bourner et al.
patent: 5531278 (1996-07-01), Lin
patent: 5550416 (1996-08-01), Fanchang et al.
patent: 5692575 (1997-12-01), Hellstrom
patent: 5842527 (1998-12-01), Arakawa et al.

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