Browse Prior Art Database

Contact Pressure Device for Personal Computers

IP.com Disclosure Number: IPCOM000040486D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Harris, JC: AUTHOR [+3]

Abstract

A technique is described whereby an option card support frame, as used to support circuit cards in personal computers, is designed with the required spring tension, so as to meet the required electro-magnetic compatibility (EMC) grounding specifications, when card brackets are installed. The design differs from prior art in that the need for springs welded onto the frame is eliminated as well as separate paint masking operations. When installed, brackets 10, as shown in the figure, are required to maintain contact pressure against frame 11 in order to meet EMC requirements. In prior art, springs or spring plates were welded to frame 11 in order to maintain contact pressure. However, this method required masking the area during painting and required extensive adjustments to mate the spring or spring plate with the bracket.

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Contact Pressure Device for Personal Computers

A technique is described whereby an option card support frame, as used to support circuit cards in personal computers, is designed with the required spring tension, so as to meet the required electro-magnetic compatibility (EMC) grounding specifications, when card brackets are installed. The design differs from prior art in that the need for springs welded onto the frame is eliminated as well as separate paint masking operations. When installed, brackets 10, as shown in the figure, are required to maintain contact pressure against frame 11 in order to meet EMC requirements. In prior art, springs or spring plates were welded to frame 11 in order to maintain contact pressure. However, this method required masking the area during painting and required extensive adjustments to mate the spring or spring plate with the bracket. The design described herein eliminates the need for separate spring welding and masking operations to frame 11 in such a way as to provide the required bracket to frame tension forces in order to meet EMC requirements. Brackets 10 are designed with an inward bend as a standard feature and this feature is utilized in the new design of frame 11. Also in the new design, bracket support 12 is an integral part of frame 11, fabricated in such a way so as to provide outward spring pressure against curled surface 13. When bracket 10 is inserted into shadow box 14, it assumes the position as shown in 15. Bra...