Percussion driver drill, and a changeover mechanism for changing over a plurality of operating modes of an apparatus
US6142242A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2000 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | Feb 14, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D2211/064
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
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 …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.