Percussive drill with safety interlock for reversing gear
US4428438A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 3, 1980 |
| Grant date | Jan 31, 1984 |
| Priority date | — |
| Expiry date | Jul 3, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D2216/0092
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A reversing switch, controlling the direction of rotation of the working spindle of a combination motor-driven hand tool, displaces a rack rod in a direction parallel to the axis of the spindle to provide an interlock both with a percussion boring feature and with provisions for seating attachments on the chuck sleeve of the tool, such as a circular saw. When the percussion boring feature is put into operative position, the rack rod is caused to prevent moving the reversing switch from right-hand rotation to left-hand rotation. When the switch is set for left-hand rotation, the seating surface of the chuck sleeve locks to prevent mounting an attachment and, at the same time, the percussion boring mechanism is blocked in an out-of-service position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.