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Casters are detachably mounted upon the underside of the molded plastic frame of a dolly by the use of a single bolt. The caster is provided with a flat, horizontally disposed mounting plate which underlies and bears against a horizontal surface on the bottom of the frame enclosed within a periphera

Casters are detachably mounted upon the underside of the molded plastic frame of a dolly by the use of a single bolt. The caster is provided with a flat, horizontally disposed mounting plate which underlies and bears against a horizontal surface on the bottom of the frame enclosed within a peripheral sidewall integral with and projecting downwardly from the frame. The mounting plate can be vertically moved into face-to-face engagement with the horizontal surface on the frame when in a first angular orientation and then rotated about a vertical axis to a second angular orientation in which webs on the sidewall spaced below the horizontal surface underlie portions of the plate to retain it against vertical separation from the frame. A single bolt detachably retains the plate against rotation from this last position.

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In a dolly including a unitary molded, horizontally disposed, load-supporting frame, a plurality of swiveling casters supporting said frame, and means on said frame for detachably mounting said casters in the underside of said frame, said casters each having a generally rectangular mounting plate wi

In a dolly including a unitary molded, horizontally disposed, load-supporting frame, a plurality of swiveling casters supporting said frame, and means on said frame for detachably mounting said casters in the underside of said frame, said casters each having a generally rectangular mounting plate with first, second, third and fourth corners and an upper surface lying in a horizontal general plane, said rectangular mounting plate further having a first opening adjacent said fourth corner; the improvement when said mounting means comprises: a plurality of flat, horizontal, downwardly facing mounting plate-engaging surfaces on the bottom of said frame, each plate-engaging surface having a second opening extending through said frame; a peripheral sidewall integral with and projecting downwardly from the bottom of said frame and extending around each of said plate-engaging surfaces, each said peripheral sidewall being conformed to surround the periphery of said rectangular mounting plate when said upper surface of said rectangular mounting plate is inserted vertically upwards with its said upper surface in face-to-face engagement with said plate-engaging surface and to accommodate limited rotation of said rectangular mounting plate relative to said frame, while so engaged, about a vertical axis between first and second angular positions relative to said frame, said peripheral sidewall including a first wall having first and second straight wall segments defining an obtuse angle between said first and second straight wall segments, a second wall having a straight second wall segment and a curved second wall segment, said curved second wall segment connected to one end of said first straight wall segment, and straight second wall segment extending generally perpendicularly to the first straight wall segment of the first wall, a third wall having a straight third wall segment and a curved third wall segment, said curved third wall segment connected to said straight second wall segment, said straight third wall segment extending generally perpendicular to said straight second wall segment and generally opposing said first wall, a fourth wall having a straight fourth wall segment and a curved fourth wall segment, said curved fourth wall segment connected to said straight third wall segment and said straight fourth wall segment connected to said second straight wall segment of said first wall, said fourth wall generally opposing said second wall and having a greater length than said second wall; first, second and third horizontally disposed thin webs integral with each said sidewall at spaced locations thereon and underlying respective portions of said plate-engaging surface and spaced from said plate-engaging surface by a distance at least equal to the thickness of said rectangular mounting plate, said webs being conformed to accommodate vertical, upward movement off said rectangular mounting plate into face-to-face relationship with said plate-engaging surface when said rectangular mounting plate is in said first angular position relative to said frame and to underlie and retain said rectangular mounting plate in face-to-face relationship with said plate-engaging surface when said rectangular mounting plate is located in said second angular position, said first opening in said rectangular mounting plate aligned with said second opening in said frame when said rectangular mounting plate is located in said second angular position, said first web having an outermost edge extending angularly from said first wall to a point generally adjacent the second wall transition from said straight second wall segment to said curved second wall segment, said outermost edge of said first web further disposed in generally linear relationship to said second straight wall segment of said first wall, said second web having an outermost edge angularly extending from said second wall to a point generally adjacent the third wall transition from said straight third wall segment to said curved third wall segment, said outermost edge of said second web being generally perpendicular to said outermost edge of said first web, and said third web having an outermost edge extending angularly from said third wall to said curved fourth wall segment, said outermost edge of said third web disposed generally parallel to the outermost edge of said first web and generally perpendicular to the outermost edge of said second web; and a bolt, including a head and a nut, mounted through said second opening in said frame and passing through said first opening adjacent said fourth corner of said rectangular mounting plate to maintain said rectangular mounting plate against rotation from said second angular position.