US2337297A - Hauling scraper - Google Patents

Description

Dec. 21, 1943. w. H. MCGLADE HAULING SCRAPER Filed Aug. 3, 1940 s Shegts-Sheet 1 1N VENT OR.

E, M m M M m M Dec. 21, 1943. w H CG D HAULING SCRAPER Filed Aug. 3, 1940 3 Sheets-Sheet 3 ATTORNEYS.

Patented Dec. 21, 1943 HAUIJNG SCRAPER Wayne H. McGlade, Indianapolis, Ind., assignor to J. D. Adams Manufacturing Company, Indianapolis, Ind., a corporation of Indiana Application August 3, 1940, Serial No. 350,989

1 Claim.

My invention relates to hauling scrapers, and more particularly to that type of hauling scraper in which thereis provided for the open front end of the bowls. movable closure which will prevent the escape of-earth from the bowl before emptying of thebowl is desired.

" One of the' main objects of my invention is to operatethe movable closureand the bowl by a common operating-means while insuring that the bowlwill'not be dumped until the closure is completely out'of the-way; Another object of my invention is to' provid'e" an improved means for raising and lQwerIn'g'the' bowl to control its elevation-both 'durlrig filling and hauling. A further' object of myinvention is to provide means facilitatingreturn ofthe bowl to normal position afterit hasbeen;dun'l'peclif In-' carrying ou't myinvention, I employ a frame comprising front-and rear sections pivotally in terconnected-on-a horizontal transverse axis between front and rear supporting wheels. The scraper bowl is pivotallyinounted on the rear section in advance "o'f tl'ie rear wheels, and is 'swingable betwe'en its loading and dumping positions about'itsafxis of' pivotal mounting. To control the height 'of the bowl the relative disposition of the two frame-sectionsabout their axis of pivotalinterconnectionis varied; and for this purpose,'Iemp1oy a thriistmember which is pivotally connected to therear frame-section above such aasana which extends forwardly over the front frame-section; i -where 5 -mechanism including sheaves-'and a'-cable-is arranged to move the thrust member rearwardly and thus raise the bowl. "--'1"hebowl-closure is movably mounted on the rear frame sectiom and is raised from bowlclosing position bwm'e'an'swhich reacts upon the bowl and tends to -tilt it from loading to dumping position. A latch, normally operating to hold the bowizin'loadingeposition; is arranged to be auto- =matically ireleased when the closure is fully raised'. wAssociated with the bowl is a yielding :m'eans arran'gedtorbestressed by movement of the bowluinto sdumping position and therefore to exerton the'bowllan effort tending to return it to loading position: .1

The-iaccompanying-drawings illustrate my invention':2l ig.:. 1 is aafragmental plan view of the scrapen-Figezj is'aa side. elevation of the scraper showing ithe bowl elevated into the hauling position; Fig; '3 is al's'o-sia side elevation, but showing the.;.bowl .rin loading position; Fig. 4 is a fragmental sidepelevation showing the bowl-closure raised and;therbowl,in dumping position; Fig. '5 .is: arfragmentalrplan view of the sheave-andcable mechanism employed to control elevation of the bowl; Fig. 6 is a vertical section on the line 6-6 of Fig. 5; Fig. 7 is-a horizontal section through the axle-post on the front frame-section; Fig. 8 is a fragmental side elevation, in partial section, of the latch which operates normally to hold the bowl in loading position; and Fig. 9 is a rear elevation of such latch mechanism.

As will be clear from Figs. 1 and 2, the frame of the scraper comprises a front section i0 and a rear section I! pivotally interconnected by pivot pins I2 disposed in alinement with each other at opposite sides of the frame. The rear frame-section i0 is provided at its rear end with coaxial supporting wheels 43. The front frame section is desirably arched to provide clearance for the front wheels and has at its frnot end a downwardly projecting axle post It, desirably oi box-section as illustrated in Fig. 7. An axle shank 15 (see Fig. 2) is rotatably mounted on a vertical axis in the post It; and the front axle it'of the scraper is pivoted to the shank i5 on a horizontal axis as by means of a pivot bolt H. A draft-tongue i8, pivoted to the front axle for swinging movement in a vertical plane, extends forwardly for connection to a tractor by means of which the scraper is drawn. Front wheels it are mounted on suitable spindles at opposite ends of the axle it.

A scraper-bowl 25 is pivoted near its open front end to the rear frame-section it by means of trunnions 26 and is swlngable about such trunnions between the carrying and loading position shown in Figs. 2 and 3 and the dumping position shown in Fig. 4. Because the trunnions 26 are located near the front of the bowl, the weight of the bowl tends to cause its rear end to drop; and to limit such movement of the bowl, it may be provided at its rear end with one or more cars 21 (Fig. 1) which engage the upper surface of a cross-member 28 on the rear frame-section ill.

The preferred form of closure for the front end of the bowl comprises an apron 30 which projects forwardly and upwardly from the cutting edge of the bowl and with which there are associated two wings 3| which extend upwardly from the apron and are provided with rearward extensions overlapping the side walls of the bowl 25. The closure is mounted on the forward ends of arms 33 whose rear ends are pivoted to the rear frame-section on trunnions 34 above the bowl.

The elevation of the bowl, both during loading and during hauling, is controlled through the medium of a thrust member 36 which is pivoted to the front end of the rear frame-section on an axis spaced well above the pivot pins |2.' The thrust member 35 desirably comprises a tubular cross member 31, which has rigid with it at its ends arms 35 pivoted to the rear frame-section H by trunnions 33, and a pair of opposed channel members 45 secured to the cross member 31 and extending forwardly therefrom above the front frame section i5, the front ends of such channels being interconnected by a cross-piece 4|. To provide additional rigidity, oblique braces 42 may extend between the front ends of the channels 45 and the opposite ends of the cross-member 31.

Mounted on the front frame section I between the channels 45, I dispose a set of coaxial sheaves 45. A cooperating set of sheaves 45 is mounted between the channels 45 at the front ends thereof. A cable 41, conveniently having its dead end secured, as at 45, to the front end of the thrust member 35, is reeved between the two sets of sheaves 45 and 45, the free end of the cable passing downwardly from the last sheave 45, around a direction-changing pulley 49 swiveled on a vertical axis at one side of the axle-post l4, and thence forwardly to suitable hoist mechanism (not shown) on the tractor which draws the scraper.

Conveniently, the sheaves 45 are mounted on a common fixed shaft 5| which is supported in a bracket 52 on the front frame section l5 and the ends of which project beyond such bracket to support rotatably a pair of guide rollers 53 received respectively in the channels 45, as will be clear from Figs. 5 and 6.

For the purpose of operating the bowl 25 and bowl-closure 353|, I employ a second cable 55. This cable may have its free end anchored, as at 55 (Fig. 1), to the thrust member 35 and is reeved between a set of sheaves51 at the rear end of the bowl and a second set of sheaves 55 rotatably supported above the cross member 31. Leaving the last sheave 55, the cable 55 extends downwardly, around a sheave 55 on the apron 35, upwardly over pulleys 55 and 5| on the front framesection, again downwardly and around a second direction-changing pulley 52 swiveled On a vertical axis at the side of the axle-post I4, and thence forwardly to the hoist mechanism on the scraper-pulling tractor.

It will be noted that, with the parts arranged as just described, the application of tension to the cable 55 will tend both to raise the closure 353| and to tilt the bowl 25 toward its dumping position. As it is desired that the closure be out'of the way before the bowl is dumped, I provide means for insuring that tension in the cable 55 will not cause dumping movement of the bowl until after the elevation of the closure has beencompleted.

' To accomplish the result just noted, I mount on the rear frame-section II in rear of the bowl a transverse rock shaft 55 (Figs. 8 and 9) rigid with which is a forwardly anddownwardiy extending latch member 55' whose free end enga es an abutment 51 on the rear wall of the bowl 25 and prevents the bowl from tilting. oward dumping position. For the purpose of rocking the shaft 55 to release the latch 55, there is rigidly secured to the shaft near its outer end an arm 55 connected by a pin 55 to a block clamped between two nuts 1| on the screw-threaded lower end of a rod 12. The rod 12 extends generally upwardly from the block 15,' its upper end being slidabiy received in a guide 13 (Figs. 2 and 4) located on the rear frame section in rear of one of the trunnions 34. The adjacent closure-supporting arm 33 is provided with a rigid finger 14 positioned to engage the upper end of and depress the rod 12 to rock the shaft and release the latch 55 as the closure reaches elevated position. A spring 15, acting between the rod 12 and the rear frame section tends yieldingly to raise the rod and hold the latch in engaged position.- Movement of the latch under the influence of the spring 15 may be limited by arranging the arm 55 so that it will engage the cross-member 25, as indicated in Figs. 8 and 9.

In the operation of the scraper, the weight of the parts between the front and rear wheels tends to cause the two-section frame to drop in the middle and the trunnions 35 and thrust member 35 to move. forwardly relative to the front framesection |5, such tendency being opposed by tension in the cable 41. Accordingly, the elevation of the bowl can be controll'edby winding the cable 41 on or unwinding it from the hoist mechanism on the scraper-drawing tractor. When the bowl is being loaded, it is held in its normal position on the rear frame section by the latch 55, and the cable 41 is adjusted so that the cutting edge of the bowl will be below the level of the earth with which the bowl is to be filled, as is illustrated in Fig. 3. During the filling of the bowl, the cable 55 is adjusted to hold the closure 35-3l in the position shown in Fig. 3 with the rear edge of the apron 35 slightly above ground level. As the scraper is drawn over the ground. the earth dislodged by the cutting edge of the bowl fills-the bowl, some of such earth falling forwardly where it lodges on the apron 35.

When the bowl has been filled tothe desired extent, the cable 41 is pulled forwardly, thus shortening the distance between the two sets of sheaves 45 and 45 and moving the thrust member 35 rearwardly. This operation changes the angular relationship of the 'two frame-sections l5 and II about their axis of interconnection and raises the bowl to the hauling position shown in Fig. 2. Simultaneously, the closure 35-3| is lowered relative to the bowl to close the front end thereof. The scraper, with its load of earth, may now be hauled to the place where it is to be dumped.

- -It is to be noted that the guide rollers 53.,

which are co-axial with the sheaves 45 and which have a diameter only slightly smaller than the internal width of the channels 45,

maintain those channels in coplanar relationship with the sheaves. As a result, tension in the cable-stretches between the sheaves 45 and 45 imposes no bendingeilort on the channels. Bowl-raising adjustment of the frame may be limited, as by the provision of co-operating stops 55 and 5| on the bracket 52 and arm 35. (See Fig. 6.)

when the scraper reaches the place where it is to be dumped, the cable 55 is adjusted to raise the closure 35-3|. At the same time the cable 55 applies a raising effort to the closure it also applies to the bowl, through the sheaves 51, an effort tending to tilt the bowl forwardly about the trunnions 25. Because of engagement of the latch 55 with the abutment 51 on the bowl, however, the bowl is positively prevented from tilting until after the closure has been raised high enough for the finger 14 to engage and depress the rod 12 to release the latch 55. As the closure reaches latch-releasing position its further upward movement is limited,as by arrangingthe wings 3| to engage the cross member 31. Thereafter, continued shortening of the cable 55 will swing the bowl forwardly to dumping position, as shown in Fig. 4. The nuts II on the rod 12 permit control of the latch-releasing position of the closure 38-3l.

As will be apparent from Fig. 4, when the bowl is in dumped position it is so nearly vertical that its weight is relatively inefiective to cause its return to normalv position. I therefore prefer to equip the scraper with means tending to return the bowl to its normal position. In the device shown, this means takes the form of a tension spring 85 secured at one end to the rear portion of the frame-section II and extending forwardly and upwardly therefrom, its front end being attached to a chain 86 which extends and is secured to an elevated point at the front of the rear frame-section. At an intermediate point on the chain 88, there is secured a sleeve 81 having a flange adapted to be engaged by a bifurcated bracket 88 on the side wall of the bowl as the bowl approaches dumping position. In clumping position of the bowl, the spring 85 is strained materially, as is clear from Fig. 4, and accordingly the sleeve 81 exerts on the bracket 88 a force tending to swing the bowl rearwardly toward normal position. As soon, therefore, as tension in the cable is released, the bowl, aided by the spring 85, and the closure 30--3| return to their normal positions under the influence of gravity.

There may be a bowl-returning mechanism --858'|--88 on each side of the machine if desired.

I claim as my invention:

In a hauling scraper, a wheel-supported vided with co-operating abutments engageable with each other to stress the spring as the bowl approaches dumping position.

WAYNE H. MCGLADE.

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