Door truck with a one piece frame and low friction wheels
AssigneeRichards-Wilcox, Inc.
InventorDouglas C. Mittag
Life of this patent
Estimating the term…
Abstract
A door truck which has a one piece frame and plastic wheels for operation in an overhead track for supporting a door in which the wheels are mounted to the frame with barrel nuts and a threaded stud. The frame has a door supporting portion through which a pendant nut can be extended with its head mounted upwardly or downwardly so as to support a door.
Claims22
A door truck for holding a door and which is moveable in and along an overhead track, comprising:
- a frame member with a vertical portion through which at least one opening is formed;
- first and second plastic wheels formed with supporting openings;
- an axle structure formed of a threaded stud threadedly receiving first and second barrel nuts which passes through the supporting openings of said wheels;
- and
- said first and second barrel nuts providing respective non-rotating bearing surfaces around which the wheels rotate, and for retaining and positioning the wheels relative to said frame opening through which the threaded stud passes.
The door truck according to claim 1 wherein the frame member has an L-shape with a bottom of the L having a flange with a hole in it which receives a bolt connecting the frame member to the door.
- 11.The door truck according to claim 10 Wherein the bolt has a head and the head is positioned against the flange with a threaded portion of the bolt extending downwardly to a mounting structure on the door.
A door truck for holding a door and which is moveable in and along an overhead track, comprising:
- a frame member with a vertical portion through which at least one opening is formed;
- first and second plastic wheels formed with supporting openings;
- an axle structure formed of a threaded stud and at least first and second holding members which pass through the respective supporting openings of said wheels;
- and
- said first and second holding members being connected to each other via said threaded stud through said at least one frame opening to mount said first and second wheels on opposite sides of said frame member, said first and second holding members each having a head and an extending portion as a bearing surface directly supporting said plastic wheels which rotate therearound, and said first and second holding members captivating and positioning said wheels relative to said vertical portion.
A door truck for holding a door and which is moveable in and along an overhead track, comprising:
- a frame member with a vertical portion through which two openings are formed;
- first, second, third, and fourth plastic wheels formed with supporting openings;
- first and second axle structures formed of at least a threaded stud and first and second holding members which pass through the supporting openings of said wheels and having non-rotating cylindrical extending portions which are in direct rotational bearing contact with plastic portions of said wheels;
- and
- said first and second holding members of each axle structure being threadedly joined to each other with said threaded stud through said respective frame openings to mount said first and third wheels on one side of said frame member, and said second and fourth wheels on an opposite side of said frame member, said first and second holding member cylindrical extending portion having an inner surface directly facing said vertical portion and an outer head captivating said wheels.
A method for assembling a door truck for holding a door, said door truck being designed for movement along an overhead track beneath which the door hangs, comprising the steps of:
- stamping out a one-piece metal frame member having a vertical portion through which at least one opening is provided;
- and
- assembling first and second plastic wheels to the frame member by threading at least a first member onto one end of a threaded stud and a second member onto an opposite end of the threaded stud to form an axle structure, the first and second members providing non-rotating bearing surfaces around which the wheels rotate and which together with a head captivate said wheels for mounting the plastic wheels at the opening.
Dependencies are inferred from the claim text.