Tray and tool holder adaptable to stepladders

Claim 1

A tool and small parts utility tray with mounting plates comprising: a rectangular tray having four exterior corners formed by the intersection of two lateral and two longitudinal exterior walls, a floor panel and interior wall elements defining open upwardly facing recessed compartments adapted to receive a closure plate hingedly attached to an upper edge of a lateral exterior wall, lateral outwardly extending flange elements attached to oppositely facing longitudinal exterior wall portions, open ended cylindrical vertical bearing surfaces formed and defined by surrounding wall portions rotatably received within said vertical bearing surfaces a shaft having a castor wheel assembly attached thereto, mounting plates comprising: an upper and a lower mounting plate for readily attaching and detaching said utility tray to a supporting surface; said upper mounting plate is rectangular in shape having a pair of length and a pair of width edge portions and an upper and a lower surface; a rib depending from the lower surface and adjacent each of said length edge portions of the plate, each of said ribs forming a longitudinal "U" shaped outwardly facing channel section; a latch with a hook shaped catch formed therewith, the latch attached to said lower surface of said upper mounting plate and a free-end extending outwardly beyond a first width edge portion of said upper plate, said hook shaped catch facing rearward toward the said second width edge portion and formed outwardly of said lower surface of said upper mounting plate; the latch being biased downward away from said lower surface of said upper mounting plate; a spring biased plunger residing within a spring and plunger housing have two end faces, said plunger housing attached to said lower surface of the upper mounting plate, parallel to and equidistant from the "U" shaped longitudinal channel sections, said plunger biased outwardly of a first end face of said spring and plunger housing and toward said latch; said upper surface of said upper mounting plate in contact with and attached to said floor panel of said utility tray; said lower mounting plate formed and having a rectangular shaped in plan, a "U" shaped inwardly facing upturned channel formed along two length edge portions of said rectangular lower mounting plate, a first and second lip formed upwardly and at the mid-point of each of two width edge portions of the lower rectangular mounting plate, said lower mounting plate attached to said supporting surface, wherein said outwardly facing "U" shaped channels of the upper mounting plate slidingly receive, in dovetail fashion, the inwardly facing channels of the lower mounting plate; said spring biased plunger forcibly urged inward of said spring plunger housing by moving contact with said first upwardly formed lip, downwardly biased latch of said hook engagingly capturing the second upwardly formed lip of the lower mounting plate thereby releasably locking said utility tray in a predetermined location relative to said mounting surface whereby the utility tray when detachedly removed from said supporting surface converts to a wheeled tool and small part utility tray.