Browse Prior Art Database

Compliant Ground Clamp for Personal Computer Testing

IP.com Disclosure Number: IPCOM000060335D
Original Publication Date: 1986-Mar-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Cummins, AW: AUTHOR [+3]

Abstract

This article describes a compliant ground clamp mechanism which provides reliable electrical grounding to personal computers (PCs) during systems test despite considerable positional variation of grounding features. In systems testing of a personal computer it is necessary to provide reliable frame grounding prior to application of high pot test voltages. Since assembly pallet, product dimension, feature tolerances and positional repeatability vary widely, it is necessary that a grounding scheme be configured such as to provide reliable grounding regardless of product and carrier variations. Referring to the drawings, Fig. 1 is a front view and Fig. 2 is an end view of the ground clamp disclosed herein. A floating tooling plate is shown in Fig. 1 in broken lines.

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Compliant Ground Clamp for Personal Computer Testing

This article describes a compliant ground clamp mechanism which provides reliable electrical grounding to personal computers (PCs) during systems test despite considerable positional variation of grounding features. In systems testing of a personal computer it is necessary to provide reliable frame grounding prior to application of high pot test voltages. Since assembly pallet, product dimension, feature tolerances and positional repeatability vary widely, it is necessary that a grounding scheme be configured such as to provide reliable grounding regardless of product and carrier variations. Referring to the drawings, Fig. 1 is a front view and Fig. 2 is an end view of the ground clamp disclosed herein. A floating tooling plate is shown in Fig. 1 in broken lines. This plate provides a method to move the clamp into proximity to the system under test. The clamp is comprised of two pneumatic cylinders 1 mounted on support plate
3. A contact bar 4 having compliant movement is attached to the rams 5 of each cylinder 1. Segmented contacts 6 and 7 are provided on the contact bar 4. A clamp body 8 having compliant movement is attached to the floating tool plate by means of shoulder screws 9. Extension springs 10 connect the support plate 3 to the floating tooling plate. In operation the PC to be tested enters the test station on its assembly pallet. The clamp is moved into position for operation. The pneumatic cylinder...