Method and apparatus for forming a row of spring coils from a continuous length of wire
US4112726A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1977 |
| Grant date | Sep 12, 1978 |
| Priority date | — |
| Expiry date | Sep 12, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21F35/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A single continuous length of spring wire is formed into a continuous length spiral or helix which is subsequently folded into a wave configuration for establishing in row form, a plurality of individual spring coils disposed generally parallel one to another. Each coil in the row is connected at its opposite ends to adjacent coils by head or connector end sections. The head or connector end sections are then formed, preferably into a planar Z-shaped configuration such that the formed connector sections at the same ends of the coils are disposed in a common plane normal to the axes of the coils which they interconnect. During forming of the end sections or heads of the coils, each connector section is deformed from a looped three-dimensional attitude into the planar Z-shaped attitude by interengagement with novel forming pins and forming dies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.