Browse Prior Art Database

Spring Back Tester

IP.com Disclosure Number: IPCOM000034594D
Original Publication Date: 1989-Mar-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 3 page(s) / 64K

Publishing Venue

IBM

Related People

Yakubowski, C: AUTHOR

Abstract

A spring back tester was developed to detect for displacement freedom, or binding conditions, of each spring-loaded insert within a matrix of inserts. It will also detect for inserts that are assembled with defective springs which do not have specified spring constants (stiffness). This tester depresses each spring-loaded insert with uniform and gradually increasing pressure and detects for spring anomalies by comparing vertical displacement of the individual plunger which pushes the inserts into the hat with respect to a reference position. The tester 9 (see figure) consists of the following major components: 1. Gas Bearing Plungers: A linear array of plungers 12 housed within closely machined journal guides 22.

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Spring Back Tester

A spring back tester was developed to detect for displacement freedom, or binding conditions, of each spring-loaded insert within a matrix of inserts. It will also detect for inserts that are assembled with defective springs which do not have specified spring constants (stiffness). This tester depresses each spring-loaded insert with uniform and gradually increasing pressure and detects for spring anomalies by comparing vertical displacement of the individual plunger which pushes the inserts into the hat with respect to a reference position. The tester 9 (see figure) consists of the following major components: 1. Gas Bearing Plungers: A linear array of plungers 12 housed within closely machined journal guides 22.

Pressurized air is used to reduce the stiction between

the plungers and guides by directing the air from the

plenum 13 through a port 23 on each plunger. This air

connects with an internal circuit of holes 24,

permitting the flow of air to each face of the plungers

12. The air flows

toward the bottom of each guide while suspending and

lubricating the plungers with a dynamic gas film. The

stiction and frictional forces are negligible, thereby

making each plunger respond only to the supply pressure

within the plenum. 2. Pushers: Pushers 14 are attached to the end of each plunger 12. The pushers are configured to only contact

the stepped, non- functional surface of the inserts 10.

The front face of the pushers are scribed with band

marks 15. As the plenum 13 is gradually pressurized,

the vertical location of the pushers 14 which are in

contact with the spring-loaded inserts 10, is

determined by the pressure being applied on the pushers

within the plenum 13, reactive spring force, and the

condition of interface between the inserts and the hat

5 (stuck or bound insert situation). Once the location

of the pushers is established by the previously

mentioned variables, defective insert sites are

visua...