Automatic shaft lock
US5016501A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 29, 1988 |
| Grant date | May 21, 1991 |
| Priority date | — |
| Expiry date | Jul 29, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B21/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An automatic shaft lock for use in power tools with one end that carries implements such as screwdriver heads, drill bits and the like, permits use of the tool manually, i.e., without power. The locking mechanism allows rotation of the shaft by the motor but locks rotation of the shaft when torque is applied at the implement end or to the housing so as to allow manual use of the tool. In the preferred embodiment, a locking ring is concentric with an end of the spindle that is connected to the implement and also with an end of the output shaft driven by the motor. A wedging pin wedges against the locking ring to prohibit rotation of the spindle and the output shaft except when the spindle is driven by the output shaft which, when driven in either direction, traps the pin in a non-wedging position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.