# US 4,392,302 A · Method of manufacturing a movable contact member

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- Number: US 4,392,302 A
- Document ID: US4392302A
- Status: Granted
- Kind: A
- Application number: 06/219,992
- Filed: 1980-12-23
- Granted: 1983-07-12
- Earliest claimed: 1979-12-31
- Assignees: Fuji Electric Co., Ltd.
- Inventors: Shigemasa Saito
- Web page: https://patentgrep.com/patent/US4392302A

## CPC

- H01H 11/00: Apparatus or processes specially adapted for the manufacture of electric switches (processes specially adapted for manufacture of rectilinearly movable switches having a plurality of operating members associated with different sets of contacts, e.g. keyboards, H01H13/88)
- Y10T 29/49208: by assembling plural parts
- Y10T 29/49213: Metal
- H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A contact member for a switching device is formed by soldering a contact tip to a movable contact member. The movable member is formed from an age-hardenable copper alloy that has been subjected in series to solution treatment, half age-hardening, grinding and rust-prevention coating.

## Claims

### Claim 1

A method of manufacturing a movable contact member formed from a flat spring and a contact tip bonded to it, which comprises the steps of:
age-hardening to a one-half hard temper a solution-treated age-hardenable copper alloy that is to be used as the material of the flat spring,
grinding the surface of the age-hardened spring material,
applying a rust-preventing film to the spring material, and
bonding the contact tip to the spring material.

### Claim 2 (depends on 1)

The method as set forth in claim 1, wherein the grinding is carried out by passing the material between two rollers.

### Claim 3 (depends on 2)

The method as set forth in claim 2, wherein the peripheral speed of the rollers is slightly different from the feed speed of the material.

### Claim 4 (depends on 1)

The method as set forth in claim 1, wherein the rust-preventing film treatment is carried out by passing the material through a solution of benzotriazole rust-preventing agent.

### Claim 5 (depends on 1)

The method as set forth in claim 1, wherein the bonding of the contact tip to the flat spring is carried out by soldering with induction heating.

### Claim 6 (depends on 1)

The method as set forth in claim 1, wherein the age-hardenable alloy is beryllium copper 25 and the age-hardening takes place at a temperature of approximately 550.degree. C. in a heating space and at such a traveling speed of the material through the heating space that each portion of the material is subjected to heating for about 30 seconds.