Abstract: Curable compositions comprising blends of active hydrogen-containing polymers and curing agents therefor are disclosed. The blends comprise 5 to 60 percent by weight of a free radical initiated addition polymer prepared from a mixture of monomers comprising:1) an epoxy monomer represented by the formula: ##STR1## where R stands for tertiary aliphatic hydrocarbon group having 4 to 26 carbon atoms,2) a polymerizable alpha, beta-ethylenically unsaturated carboxylic acid, and3) optionally at least one other polymerizable alpha, beta-ethylenically unsaturated monomer.Also present in the blend is 10 to 50 percent by weight of an acrylic copolymer different than the addition polymer mentioned above prepared from a mixture of monomers comprising:1) a monomer of the formula: ##STR2## where R.sub.2 is a polymerizable unsaturated hydrocarbon group, R.sub.3 is hydrogen or C.sub.1 to C.sub.4 alkyl, n=2 to 4 and2) at least one other unsaturated monomer copolymerizable therewith.

Abstract: A holding device for holding a workpiece in an adjustable position while one or more operations are carried out thereon comprises a base having an annular flange which is received in arcuate recesses provided for such purpose in a pair of mutually spaced and mutually opposed support arms. At their opposite ends, such support arms are provided with opposed concave recesses receiving a generally spherical member carrying a workpiece attachment plate on which a workpiece can be supported. A shaft extends through the support arms intermediate their ends and spring means associated with that shaft bias the support arms toward each other to retain the annular flange within the arcuate recesses and the generally spherical member within the concave recesses.

Abstract: A random box closing apparatus of the type having a box closing and sealing station having a sealing head which is movable upwardly and downwardly to accommodate boxes of different heights and having a main conveyor adjustable for box width, and having a box sensing station for sensing the height of the box, and having a sensing conveyor adjustable for box width and for further sensing the width of the box, and thereby controlling the spacing of the main conveyor in the box closing and sealing station, in which the apparatus is characterized by height sensing means operable to sense the combined height both of the box and the upper closure flaps extending thereabove when open, and delivering a combined height signal responsive thereto, and movable carriage means upon which said height sensing means is movable upwardly and downwardly, at the box sensing station, and having signal communication means connecting between the height sensing means and the power operated movement means, whereby to move the box seali