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The inventive concept is a device which is used to secure a sheath or stack of papers contained in an architectural sheet rack clamp. The device is essentially a three-tiered rectangular structure forming two parallel, length-wise channels within the spaces defined by the three tiers. One channel, s

The inventive concept is a device which is used to secure a sheath or stack of papers contained in an architectural sheet rack clamp. The device is essentially a three-tiered rectangular structure forming two parallel, length-wise channels within the spaces defined by the three tiers. One channel, situated as the upper clamp retaining channel, is structured so as to securely accommodate the typical sheet clamp used to store such materials as architectural drawings, maps, and other similar over-sized sheets. The second, or lower desk anchoring, channel of the device, contains two adjustable fastening means, enabling attachment of the lower desk anchoring channel to a desk, draftsman's stand, or table.

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1. A device for detachably retaining, in a horizontal orientation atop a desk, a portable sheet clamp having an L-shaped catch and containing oversized paper sheets, the device comprising a predominantly orthogonal longitudinal structure having two parallel, U-shaped channels, wherein the first such

1. A device for detachably retaining, in a horizontal orientation atop a desk, a portable sheet clamp having an L-shaped catch and containing oversized paper sheets, the device comprising a predominantly orthogonal longitudinal structure having two parallel, U-shaped channels, wherein the first such channel, forming an upper clamp retaining channel, comprises an inner width dimension sufficient to contain the clasping section of commonly used portable sheet clamps, and the second such channel forming a lower desk anchoring channel, comprises an inner width dimension which permits secure fit onto the edge of a worktable or desk, the upper clamp retaining channel further comprising a back plate of a thickness allowing the engagement of the L-shaped catch of said portable sheet clamp and a means for attaching the clamp retaining channel to the portable sheet clamp, and the lower desk retaining channel further comprising at least two means for horizontally fastening said lower desk retaining channel onto said edge of a worktable or desk. 2. A device for detachably retaining, in a horizontal orientation atop a desk, a portable sheet clamp having an L-shaped catch and containing oversized paper sheets, the device comprising a primarily longitudinal unitary structure having a rectangular top plate having a top surface and a lower surface;a rectangular middle plate having a top surface and a lower surface;a rectangular bottom plate having a top surface and a lower surface;a rectangular back plate having an outer surface, an inner surface, and of a thickness dimension allowing the engagement of the L-shaped catch of said portable sheet clamp, whereinsaid top plate, middle plate, and bottom plate are oriented parallel to each other and orthogonally and permanently attached along their lengths, to the inner surface of said back plate, said attachments thereby forming (a) a U-shaped upper clamp retaining channel running lengthwise between said top plate and middle plate and, (b) U-shaped lower desk retaining channel running, lengthwise between said middle plate and bottom plate;said unitary structure further comprising a plurality of threaded fasteners insertable perpendicularly and vertically upward through correspondingly threaded openings in said bottom plate, a lockscrew insertable perpendicularly through said back plate so as to emerge into said upper clamp retaining channel, and an acceptor slot excised from said back plate for acceptance of a threaded fastener of the type commonly found on portable sheet clamps. 3. A device as in claim 2, wherein said threaded fasteners comprise at least two machine-threaded bolts, each threaded at one end and having an integral T-handle affixed to the opposite end; andsaid lockscrew comprises a bolt having a threaded structure at one end, and having a gripping surface facilitating grasping by a user's fingers at the opposite end. 4. A method of facilitating the securement and convenient use, in a horizontal orientation atop a desk, table, or drafting stand, a portable sheet clamp having an L-shaped clasp, said clamp being used to retain architectural drawings, maps, and other similar oversized sheet materials, by the steps of: constructing a predominantly orthogonal longitudinal structure having two parallel, equal-length, U-shaped channels, formed byconstructing a rectangular top plate having a top surface and a lower surface;constructing a rectangular middle plate having a top surface and a lower surface;constructing a rectangular bottom plate having a top surface and a lower surface;constructing a rectangular back plate having an outer surface and an inner surface and of a dimension allowing the retention of the L-clasp of said portable sheet clamp;orienting said top plate, middle plate, and bottom plate parallel to each other and attaching, orthogonally along one length of each of said top, middle, and bottom plates, to the inner surface of said back plate, said attachments thereby forming (a) an upper clamp retaining channel running lengthwise between said top plate and middle plate and, (b) a lower parallel, desk anchoring channel running lengthwise between said middle plate and bottom plate;wherein the clamp retaining channel comprises an inner width dimension sufficient to contain the clasping section of said portable sheet clamp, and the desk anchoring channel comprises an inner width dimension which permits secure fit onto the edge of a worktable or desk, the clamp retaining channel further comprising a back plate of a thickness allowing the engagement of the L-shaped catch of said portable sheet clampproviding for a plurality of threaded fasteners insertable perpendicularly through said bottom plate, a lockscrew insertable perpendicularly through said back plate, and an open slot excised from said back plate;attaching, by means of said threaded fasteners, said lower channel to said desk, table, or drafting stand; andattaching, by means of said upper channel and lockscrew, said portable sheet clamp. 5. A method as in claim 4, wherein said threaded fasteners comprise at least two machine-threaded bolts, each threaded at one end and having an integral T-handle affixed to the opposite end; andsaid lockscrew comprises a bolt having a threaded structure at one end, and having a knurled gripping surface facilitating grasping by a user's fingers at the opposite end.