US2455160A

US2455160A - Load leveler for power scoops

Info

Publication number: US2455160A
Application number: US704108A
Authority: US
Inventors: Burrow Bob
Original assignee: Individual
Current assignee: Individual
Priority date: 1946-10-18
Filing date: 1946-10-18
Publication date: 1948-11-30
Anticipated expiration: 1965-11-30

Description

Nov. 30? 1948 B. R OW I 2,455,160

LOAD LEVELER F011. POWER scoors Fi led Oct. 18,1946

'atented Nov. 30,3948

UNITED STAT S PA E OFFICE:

SClalms. (01. 73-426) This invention .pertains to load levelers-forower scoops.

Heretofore, aggregates for cement mix were aeasured by hand shovels or scoops, or by measuring boxes of predetermined proportions. Iince the advent of the power scoop, attached to he front of a small tractor, manual handling of .ggregates is unnecessary and undesirable. The rower scoop is used to pick up and convey agrregates from the supply pile to the mixer apron. loads taken by impact on the power scoop, however, vary, due to unavoidable differences in loadng conditions, such as the height of the supply iile, moisture content, etc. In order to secure iroperly proportioned mixes it is necessary to se- :ure uniform loading of the scoop. It is con- ;idered impractical to load the scoop uniformly 2 Figure 2, is a side sectional view thereof. Similar numerals referto' similar parts in the several views.

The scoop body i is provided with guide channels 2 positioned, as shown, a desired distance from its bottom on each of its side plates to receive the-ends of screed bar 3. This is attached to the bottom of a vertically extending rod 4 pivotally attached by a bearing block 6 to a yoke 1, which, in turn, is pivoted to the side plates of the scoop by bolt pins ii, and acts as a supporting link.

A spring 8 normally urges the bar 3 toward the rear of the, guides 2 where it is retained until forced forward by a pull on cable attached to the top of rod d. When this cable is pulled toward the rear of the scoop the rod d pivots on :ach'tim-e, however, I have found that if the I :coop is over loaded, it is possible to screed oil. ".he excess load and leave a uniform remainder if the material in the bottom of the scoop. This remainder can be controlled by the position and action of the screed as it moves over the top of v the load, thus removing the excess from any given scoop load, a uniform volume may be selected and this may then be mixed with the proper proportion of cement to attain a uniform In view of the foregoing, one of the objects of my invention is to provide a scoop for power operated attachment to utility tractors which will receive an impact load of aggregrates in excess of a predetermined desired load and upon operation of a screed bar within the body of the scoop, reject all but a predetermined desired portion of said load.

A second object is to provide a scoop for power shovels, attached to utility trucks, having a screed bar operative as a sweep within the body of the scoop and controlled by mechanism actuated from the operator's compartment in the truck.

A third object is to provide a utility truck elevating scoop with a leveling screed bar, operative by pivotally mounted levers, and with sliding motion controlled by guides within the body of the scoop.

Other objects will appear hereinafter.

I attain the foregoing objects by means of the devices shown in the accompanying drawings, in which:

Figure 1 is a perspective view of a power onerated scoop, of the type attached to a utility truck or tratcor, with my load leveling device incorporated; and

its supporting bearing 6 and yoke] swings downward so that bar 3 will move along the channel guides 2. This motion is against the tension of spring8 and as soon as pull on the cable is released the bar returns to the inner end of guides 2.

An apron it may be added to extend above bar 3 if desired; Scoop l is attached to the elevating track of a utility truck by arms 9 and ill in the usual manner, and the customary dumping mechanism (not shown) is used in the manner well known to the art.

In use, a load of sand or aggregate is taken by lowering the scoop, and forcing it into the supply pile by forward motion of the truck. The scoop is then raised above the pile and the leveling mechanism operated by pull cable t. This screeds off the excess aggregates above the predetermined level indicated by guides 2 and governed by their distance from the bottom of the scoop, and levels the load on the scoop to a known amount. The leveled load may then be carried to the mixer and mixed with the proper proportion of cement.

Having fully described my invention and explained its use I wish to be limited only by the followingclaims. a

I claim:

l. A load leveler for power operated scoops comprising, in combination, a, scoop body having a bottom, sides, guide channels on the inner faces of said scoop sides a predetermined distance from said bottom, a screed her having its ends slidably operative in said guide channels so that its lower edge moves in a plane a predetermined distance above said scoop bottom and having an upwardly extending apron, a link yoke pivoted to the sides of said scoop body, a vertically extending operative rod attached to said screed bar pivotally mounted on said link yoke, and a spring operative between said screed bar and the rear portion of said scoop body, adapted to normally retain said bar in inoperative position at the inner end oi said guides. and means for drawing the top of said operative bar toward the rear of the scoop body.

2, A load ieveier for power operated scoops,

' comprising, in combination, a scoop having a bottom, side plates, an open front and a'raised back, horizontal guide channels on the inner faces of said side plates, positioned a predetermined distance above said bottom, a horizontal screed bar having a superposed apron, with its ends slidably operative in said guide channels above said scoop bottom, a link yoke pivotally supported on the sides of said scoop, a vertically extending operative rod attached to the middle of said screed bar and pivotally mounted on said link yoke, and a spring normally holding said screed bar in a retracted position to the rear oi said guides, said operative rod extending above said pivotal link yoke mounting and having an operative pull cable attachment thereon.

3. A load leveler for power operated scoops including, in combination, a scoop adapted to be mounted on a power truck, said scoop'having a on the sides oi said scoop body,

flat bottom, an open front and an elevated back and sides, guides formed on the inner faces of said sides a predetermined distance above said scoop bottom, a screed bar having its ends operatively supported in said guides so that its lower edge will move in a plane above said scoop bottom,

REFERENCES CITED The following references are of record in the file-of this patent:

UNITED STATES PATENTS Number Name Date 304,939 Kohler Sept. 9, 1884 678,272 Neumayer July 9, 1901 993,560 Skyum May 30, 1911 1,567,320 Davis -5.-- Dec. 29, 1925