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Compliant Latch for Electronic Cards

IP.com Disclosure Number: IPCOM000034703D
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 5 page(s) / 159K

Publishing Venue

IBM

Related People

Behrens, LM: AUTHOR [+6]

Abstract

Described is a method of latching a covered electronic logic card or "book", into a logic cage such that contact pin insert/extract forces are overcome with a user friendly "feel", positive retention is achieved, and system tolerances are corrected for (allowing full seating of the connectors between the logic book and cage). (Image Omitted) An overview of the logic card/cage concept is shown in Fig. 1. The books 1 are equipped with latches 2 at the top and bottom and are inserted into a logic cage 10 which includes a backplane card 3 at its rear and latch engagement features 4 at its top and bottom. Also included on cage 10 are secondary latch bars 5. Connection is made between books 1 and the backplane inside the cage (not shown). (Image Omitted) Fig. 2 shows details of an individual latch.

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Compliant Latch for Electronic Cards

Described is a method of latching a covered electronic logic card or "book", into a logic cage such that contact pin insert/extract forces are overcome with a user friendly "feel", positive retention is achieved, and system tolerances are corrected for (allowing full seating of the connectors between the logic book and cage).

(Image Omitted)

An overview of the logic card/cage concept is shown in Fig. 1. The books 1 are equipped with latches 2 at the top and bottom and are inserted into a logic cage 10 which includes a backplane card 3 at its rear and latch engagement features 4 at its top and bottom. Also included on cage 10 are secondary latch bars 5. Connection is made between books 1 and the backplane inside the cage (not shown).

(Image Omitted)

Fig. 2 shows details of an individual latch. Latch 2 is constructed of a single molded plastic part and includes two pivot pins 6 which are trapped in mating holes in the book covers not shown in the figure for clarity and a latch camming member 7 that interfaces vertical camming surfaces 8 on cage 10 and serves to draw the book 1 in or out of the cage 10 as latch 2 is rotated. Note that camming will occur on one side of the member 7 or the other with the corresponding cage camming of the member 7 or the other with the

(Image Omitted)

corresponding cage camming surface 8 depending on whether the book is being inserted or withdrawn. The compliant body 9 of latch 2 has attached to it compliant arm 11, on which are secondary latch 12 and release arm 13. During operation the compliant latch body 9 will allow latch operating point 14 to continue to be rotated after book 1 has been fully inserted. As this occurs, the secondary latch 12 rides up over and engages behind latch bar 5 on cage 10 (details of cage 10 described above are shown in Fig. 3), locking book 1 in place. Unlatching is accomplished by squeezing latch body 9 and release arm 13, lifting and releasing secondary latch 12, and allowing latch body 9 to be rotated in the opposite dir...