Apparatus for stress relieving springs and the like
US3935413A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 1974 |
| Grant date | Jan 27, 1976 |
| Priority date | — |
| Expiry date | May 30, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B3/0004
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Apparatus comprising a rotary supporting table for moving circumaxial series of work holders in a predetermined circular path. Each work holder comprises an upright pin adapted to receive on and about itself a coil spring and a base member. The base member takes the form of an electrically conductive electrode part. At a loading station, springs are deposited successively on the pins and the table is indexed to move the pins and springs to a stress relieving station. Prior to the stress relieving station, a rotary brush engages the springs and indexes them about their pins to bring an end surface of an end coil into engagement with a small vertical abutment on the base member. The base members have inclined seating surfaces for the side surfaces of the end coils of the springs. At the stress relieving station, an upper electrode is moved into engagement with an upper-most coil of the spring to set the spring slightly and a second part of a lower electrode is moved into engagement with the electrically conductive base member or first electrode part. The spring is then resistance heated for stress relief and thereafter passes through a cooling tunnel having an air blower associated t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.