Frame for supporting frangible sheet materials

DETAILED DESCRIPTION We claim: 1.
A frame for supporting and retaining sheet materials, said frame comprising in combination: a.
a pair of racks positioned adjacent one another in an opposed relationship for receiving and engaging portions of the sheet materials, each rack of said pair of racks including a base, a sloping side and at least a pair of passageways extending transversely through said rack in general planar alignment with said base; b.
a plurality of apertures disposed within said sloping side of each said rack for receivingly engaging penetrating portions of the sheet materials, each said aperture being diamond shaped and having the major axis transverse to said rack and the minor axis in general alignment with said rack; c.
at least two rods for interconnecting said racks of said pair of racks and maintaining said racks spaced apart from one another with the sloping sides thereof facing one another, each of said rods engaging a passageway within each of said racks; and d.
interference means disposed intermediate said rods and the respective ones of said passageways for establishing an interference fit therebetween to restrain inadvertent change in spacing intermediate said racks of said pair of racks.
2.
The frame as set forth in claim 1 wherein said passageways extend into said racks through said sloping sides.
3.
The frame as set forth in claim 2 including a boss disposed about each of said passageways for adding structural integrity intermediate said base and said sloping side of said racks.
4.
The frame as set forth in claim 3 wherein said interference means comprises a ridge disposed within each said passageway for establishing an interference fit between said rods and the engaged ones of said passageways.
5.
The frame as set forth in claim 4 wherein the acute angle of said diamond shaped apertures is 30.
degree.
.
6.
The frame as set forth in claim 5 wherein the side surfaces of said diamond shaped apertures slope inwardly at an angle of 75.
degree.
with respect to the plane of said sloping side