Torque controlled tapping device
US4002960A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1974 |
| Grant date | Jan 11, 1977 |
| Priority date | — |
| Expiry date | May 1, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23Q15/12
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A threading and/or tapping device has a housing including a tubular portion and a chamber portion that provides a shelf for a motor. A shaft rotatably connected to a slide within the tubular portion extends downwardly through the chamber portion with a tool holder on its exposed end. The slide is movable by the operator to advance and retract the shaft and a gear train within the chamber includes a drive gear on the motor shaft and a driven gear through the axis of which the tool holder shaft extends to rotate therewith and to slide relative thereto as the operator advances or retracts the shaft. The housing includes means for detachably attaching it with the work holder shaft either normal to or axially aligned with a support. Means are provided to maintain, by a tachometer feedback control, a selected motor speed and a trip is provided to interrupt the operation of the motor if a predetermined maximum torque is exceeded, the torque being visually presented to enable the operator to so control the advance of the tool that overcutting at its leading or trailing edges may be substantially eliminated by maintaining the torque within an optimum range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.