US3696936A — Printed circuit card rack

Claim 1

Independent Claim 172 words

A printed circuit card rack and guide assembly comprising, a. a pair of horizontally spaced end plates, b. a pair of vertically spaced shelf means connected to said end plates, c. a plurality of pairs of apertures in said shelf means, at least one aperture of each pair being an elongated slot, d. a plurality of card guides, each of said card guides including snap-in projections snapped into one of said pairs of apertures, the size of said projections and said elongated slots being such as to slidably retain said projections in said slots, e. each of said card guides having a base and a pair of vertical sides forming a U-shaped cross-section, f. at least a portion of said base having a curved, pre-bowed shapE, and g. each of said card guides being composed of material which is sufficiently resilient such that, upon insertion of a printed circuit card, said curved, pre-bowed base is at least partially flattened and said projection slides in said slot to accommodate elongation of said guide.

Claim 2

Dependent Claim 172 words

A printed circuit card rack and guide assembly comprising, a. a pair of horizontally spaced end plates, b. a pair of vertically spaced shelf means connected to said end plates, c. a plurality of pairs of apertures in said shelf means, at least one aperture of each pair being an elongated slot, d. a plurality of card guides, each of said card guides including snap-in projections snapped into one of said pairs of apertures, the size of said projections and said elongated slots being such as to slidably retain said projections in said slots, e. each of said card guides having a base and a pair of vertical sides forming a U-shaped cross-section, f. at least a portion of said base having a curved, pre-bowed shapE, and g. each of said card guides being composed of material which is sufficiently resilient such that, upon insertion of a printed circuit card, said curved, pre-bowed base is at least partially flattened and said projection slides in said slot to accommodate elongation of said guide.

Claim 3

Dependent Claim 39 words

The printed circuit card rack and guide assembly as claimed in claim 1 wherein each of said guides comprise curved, pre-bowed mid-portions spaced from said shelf means, and flat surfaces adjacent said projections in engagement with said shelf means.

Claim 4

Dependent Claim 68 words

The printed circuit card rack and guide assembly as claimed in claim 1 wherein said shelf means comprise one-piece shelf members, said shelf members being bent at a plurality of right angles to form front and rear channel-shaped portions, and elongated vent slots in said shelf members extending substantially the full width between said card guides and substantially the full distance between said front and rear channel-shaped portions.

Claim 5

Dependent Claim 46 words

The printed circuit card rack as claimed in claim 3 wherein said front channel shaped portions include a flat, vertical front edge, and indicia means imprinted on said edge in vertical alignment with each card guide for indicating the index position of each printed circuit card.

Claim 6

Dependent Claim 84 words

A printed circuit card rack comprising: a. a pair of horizontally spaced end plates, b. a pair of upper and lower horizontal members connected to said end plates, c. a plurality of slightly elongated slots in said horizontal members, d. a plurality of prebowed card guides, e. means securing said prebowed card guides to said horizontal members, f. said securing means including projection means extending through and slidable in said slightly elongated slots for accommodating variations in the length of said prebowed card guides.

Claim 7

Dependent Claim 84 words

A printed circuit card rack comprising: a. a pair of horizontally spaced end plates, b. a pair of upper and lower horizontal members connected to said end plates, c. a plurality of slightly elongated slots in said horizontal members, d. a plurality of prebowed card guides, e. means securing said prebowed card guides to said horizontal members, f. said securing means including projection means extending through and slidable in said slightly elongated slots for accommodating variations in the length of said prebowed card guides.

Claim 8

Dependent Claim 54 words

The printed circuit card rack as claimed in claim 5 wherein said prebowed card guides include integral snap-in projections forming said projection means, said snap-in projections including reduced diameter portions having diameters slightly less than the width of said slots, and enlarged diameter portions having diameters slightly greater than the width of said slots.

Claim 9

Dependent Claim 47 words

The printed circuit card rack as claimed in claim 5 wherein said horizontal members include vertical flanges, each of said end plates including integral tabs engaging and secured to said vertical flanges, each of said end plates further including horizontal flanges rigidly connected to said horizontal members.

Claim 10

Dependent Claim 38 words

The printed circuit card rack as claimed in claim 7 wherein said vertical flanges of said horizontal members are spot welded to said tabs, and said horizontal members are spot welded to said flanges on said end plates.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1975-10-10	1976-04-10	1976-10-10	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1979-10-10	1980-04-10	1980-10-10	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1983-10-10	1984-04-10	1984-10-10	$7700.00	Window Closed / Lapsed

Printed circuit card rack

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