US3248128A - Pivotal load bearing plate for wheelbarrows - Google Patents

Description

April 6, 1966 L. l. GRABLE ETAL 3,

PIVOTAL LOAD BEARING PLATE FOR WHEELBARROWS Filed Sept. 21, l96 4 United States Patent 3,248,128 PIVOTAL LOAD BEARING PLATE FOR WHEELBARROWS Lawrence I. Grable and Gilbert W. Grable, both of 12325 La Cadena Drive, Colton, Calif., and Donald L.

Grable, 546 Prospect St., Riverside, Highgrove, Calif.

Filed Sept. 21, 1964, Ser. No. 397,892 1 Claim. (Cl. 28047.31)

This invention relates to a wheelbarrow frame such as shown in our patent application, Serial No. 224,297, now US. Patent 3,199,891, in which many of the elements are the same as used in this application.

The general object of the invention is to provide a new and novel means of protecting lawns, roofs, and other surfaces from damage from the front end of the wheelbarrow frame, when dumping material upon a surface which is susceptible to damage from high load concentration or shifting when dumping, produced by the small area of contact presented by the supporting front member of the conventional wheelbarrow.

A more specific object of our invention is to provide a pivotally mounted load bearing shoe attached to the wheelbarrow frame so constructed and arranged that the shoe materially reduces the unit pressure on turf, roof or loosely packed earth, and, that the shoe does not shift position after the load is transferred from the wheel to the shoe when dumping the load; this prevents any damage to the turf, roof, etc.

Other objects and advantages of this invention will be apparent from the following description taken in connection with the accompanying drawing, wherein:

FIG. 1, is an elevational view of a wheelbarrow embodying the pivotally mounted load bearing shoe of our invention. 7

FIG. 2, is an elevational view of the wheelbarrow of FIG. 1, but showing the application of the pivotally mounted shoe in load bearing position when the barrow is raised to discharge its load.

FIG. 3, is a fragmentary plan view of the front end of the wheelbarrow to show in enlarged detail, the load bearing shoe and its pivotally mounted elements, the view being taken along the lines 33 of FIG. 1.

FIG. 4, is a side elevation of the elements shown in FIG. 3, the view being taken on thelines 44 of FIG. 3.

FIG. 5, is an enlarged fragmentary side elevation of the pivotally mounted load bearing shoe, as it appears in FIG. 2.

FIG. 6, is an exploded view in perspective showing the shoe and the barrow frame elements which provide for pivotal movement of the shoe.

Referring to the drawing by reference characters we have shown our invention as embodied in a wheelbarrow which is indicated generally at 10. As shown, the wheelbarrow, 10, includes a pair of tubular metal extensions 11a and 1117, which project forwardly and downwardly from the center section of the wheelbarrow frame, 11, which has a front tie bar, 110, that is encircled by the shoe plate pivot, 20b, that is attached to the shoe plate, 20a, to comprise the shoe plate generally, 20.

3,248,128 Patented Apr. 26, 1966 "ice Welded to front extension, 11a, is a stop, 11s, which controls the position of the shoe limiting the counterclockwise movement to prevent the shoe from contacting the periphery of the wheel 13.

In FIG. 2, the arrangement is shown diagrammatically wherein the wheelbarrow, 10, assumes the dumping position on the surface, T, with the shoe contacting the surface, T; in this position it will be noted that the entire surface of the shoe is in'full contact with the surface, T, with the pressure applied along the longitudinal center line of the shoe, 20, before the load is transferred from the wheel, 13, to the shoe, 20; that shoe, 20, has several times the bearing area of the wheel, 13, eliminating any possibility of the shoe shifting its position, under load, while dumping. Y

From the foregoing, it will be apparent that we have a novel improvement to a wheelbarrow which can be economically manufactured and which is strong in construction and with which loads can be safely dumped without damage to the supporting surface, T. 7

Having thus described our invention, we claim:

In combination with a wheelbarrow, a flat pivotal load bearing plate mounted on said wheelbarrow, said wheelbarrow including a load carrying tray and a carrier wheel, said carrier wheel being mounted forward of the center of gravity of the tray, a frame structure including spaced side members positioned under said tray and secured thereto; a support attached to each side member of said frame to the rear of the center of gravity of said tray; said car- -rier wheel mounted on a load carrying axle one end of which is attached to one of said side members and the other end is attached to the other of said side members forward of the supports and the center of gravity of said tray; a cylindrical tie member connected to the extreme front end of each of said side members forward of and enclosing the carrier wheel; a cylindrical tube rotatably mounted on and encircling said tie member between the frame side members; said flat plate attached to said tube along its longitudinal center line with the ends of the tube equidistant respectively from the ends of said plate; said plate and said tube being free to rotate around said cylindrical tie member at the front end of the said frame side members; a stop attached to the front portion of one of said side members adjacent to the said cylindrical tie member for engaging said flat plate to prevent rotation of said plate into the periphery of the carrier wheel.

References Cited by the Examiner UNITED STATES PATENTS 1,365,106 1/1921 Hyde 280-4712 1,436,965 11/ 1922 Landkamer 28(l47.31- X 2,462,424 2/ 1949 Popplewell 298 -3 FOREIGN PATENTS 1,281,947 12/ 1961 France.

1,287,203 l/ 1962 France.

BENJAMIN HERSH, Primary Examiner.

I. A. PEKAR, Assistant Examiner.

Images