US2304441A - Scraper and earth mover - Google Patents

Description

Dec. 8, 1942. I M. M. BRODERSEN arm. ,304,

SCRAPER AND EARTH MOVER Original Filed April 6, 1936 2 Sheets- Sheet 2 65' I INVENTORS FIG-8.

- Facet e 9 Y ENT oF-Floe S CR'APEKAND EARTH MOVER Max M..Brodersen, Alhambra, and Leu 0. Bird,

Glendale, Calii'., assignments, to

assignors, by direct and mesl le R. G. Le Tourneau, 1110;, Stockton, Calif., a corporation of California Original application April 6, 1936, Serial No. 72,934. Divided and this application June 7,

1939, Serial No. 277,950

1 Claim. (01. 37-126) This invention relates to improvements in heavy duty earth handling or scraper apparatus of the type shown in our applications for Letters Patent filed March 25, 1935, Serial No. 12,812, Pat.No. 2,168,318, and April 6, 1936, Serial No. 72,934, Pat. No, 2,168,319, the present application being a division of our application Serial No. 72,934.

One of the purposes of this invention is to provide an implement having a bowl and an apron -or closure therefor, in which the bowl comprises a forward section which is fixed to the frame and rear section hinged to the forward section whereby the material carried by means of the bowl and apron may be said to be divided into three portions, namely, a portion retainedby the apron, a portion retained by the fixed section and a portion in the rear section, thus the portion retained by the apron is discharged upon raising said apron, then, by tilting the rear section, the portion within the forward section is pushed out by the weight of the discharging portion from the rear section and inasmuch as it is necessary to lift only the portion of the material within the rear section of the bowl. less power is required than heretofore possible for handling like loads.

Moreover these provisions in making it unnecessary to lift but one of three portions of the entire load, and but a small part of the load carrying receptacle, decrease friction and wear, render the operation of the implement smoother and more reliable, and also make possible a nicety of control not heretofore-possible, as well as in- V crease the efficiency of the implement as a whole.

Another purpose of this invention is to provide heavy duty earth handling apparatus of the character described which by reason of the use of sectional bowl construction and associated means including a scraper blade fixed to the fixed section of the bowl and hinged to the tiltable section of the bowl, makes it unnecessary to employ a latch for holding the tiltable section against undesirable tilting when engaged in the earth during the loading operation.

A further purpose of this invention is to provide apparatus of the character described wherein a novel form of single cable and straight line operated block and tackle means may be advantageously used for controlling and effecting the operation of the sectional bowl-apron unit, such that upon pulling the cable the apron is first lifted and then the movable section of the bowl is tilted and upon releasing the cable, said section of the bowl returns to carrying position first, and then the apron can be lowered.

With the foregoing and other objects in view, the invention hereof consists in' th combination, correlation and construction of parts, elements and features which will be described in the following specification and finally pointed out in the claim hereto appended, it being understood that the apparatusof our invention is subject to modification within the scope of said claim.

Figure l is top plan view of one form of scraper embodying the invention.

Figure 2 is a side elevation of Figure 1, showing the implement in the carrying position.

Figure 3 is a side elevation showing the implement in the scraping position.

Figure 4 is a side elevation illustrating the dumping position of the implement.

Figure 5 is a section of line 5-5 in Figure 1.

Figure 6 is a section on the same plane as Figure 5, showing the dumping, position of the bowl.

Figure 7 is a detail of theswivel means forsupporting the implement on the forward carriage.

Figure 8 is a section on line 88 in Figure 6.

In the embodiment of the invention, as shown in the accompanying drawings, a jointed vehicular frame structure la is made up of forward and rearward sections 2a and 3a. The forward section 2a includes a transverse member to provided with a leg 5a swivelled at 60. on a wheeled carriage la. A draft tongue 8a provides for connection of said carriage with a tractor. Rearwardly and downwardly extending arms 9a of the carriage la are pivotally connected as at Illa with the rearward section'3a.

As here provided the rearward section 3a of frame la-comprises Side members 62 which in their fabrication include the solid side plates 63 which are of an inverted triangular shape and are fabricated to make the side members 62 of a tubular or hollow cross section, as illustrated in Figure 8. One leg of each of the triangularly shaped member 62 projects rearwardly and terminates in the extension 64 pivotally supported on the rear axle Ila, of a wheeled carriage 12a, while the other leg projects upwardly.

Interposed between the upwardly projecting legs of the triangular side members 62 and secured thereto is a tubular cross member 20a which carries intermediate its ends a pair of forwardly extending lugs which in turn pivotally support as at 22a. the rear ends of the pair of forwardly extending arms 23a. The forward ends of arms 23a are pivotally supported, as at 26a, on the upper ends of links 25a which in turn are pivotally connected, as at 2111, to the frame section 2a Interposed between the forward ends j and bowl. Lugs 88 on links .L member 20a and the ;-f. ca ble,58a isdead ended on theback of the bowl -cley1 2 9a fa "extended When a pulling force is between the pulley blocks 28a and Na and passed over one idler pulley 29a and through swiveled pulley 3la and is then connected to a hoist on a vehicle or tractor in the'usual manner. When the cable 32 is pulled, the arms 23a are pushed rearwardly, by reason of the fixed ulley block l9a, thereby swinging the rear section 3a upwardly about the axle Ila, thu'sraising the rear part of a bowl 10 mounted on the rear sectionv 3a. When the cable 321i is released, the weight of the bowl and frame structure lowers the frame 251! abut stops 69 on frame member. to limit the height to which the implement may be raised.

interposed between plates 13 and secured to the bottom edge thereof. The tiltable section I2 of the bowl comprises a bucket 15 which is hinged .to the blade I4 as shown at 16. An apron or clo- ..i sure 45a pivotally connected as shown at 5011 to frame section 311 through the arms 49a, is provided for;;the;receiving end of the bowl M for retaining material in excess of the capacity of "the bowl. v Pulley blocks59a, lilla'and Bin are mounted on the back of the tiltable section 12, on the cross apron 48a, respectively. A

'ctio 12,. as shown at 11, and reaved through ,pul'ley blocks 59a and-1160a, then passed to pulley blockbla and waved-through it and the pulley block ;;l9a,' then i passed over another idler puldthrough sw'iveled pulley 30 and then .'so thatit maybeconnected to a hoist on the tractor or vehicle.

exerted on the cable 58a a block and tackle effect takes place between pulley blocks I So and iila thereby raising the apron 48a which is lighter in weight than the tiltable bowl section 12. When the apron reaches the end of its upward movement as limited by the cross member a, further pulling on the cable 58a causes a block and tackle effect between pulley blocks 59a and 60a whereby to tilt the bowl section 12 for dumping. When the cable is released the section 12 and apron 48a gravitate to carrying position shown in Figure 2, the section I2 dropping first and then the apron.

By virtue of this construction of the bowl a portion of the accumulated material is discharged first by raising the apron 4811, then by tilting the bowl section 12 the material in the fixed section II of the bowl is pushed out by the discharging portion from the tilted section 12, thus it is necessary to lift only the portion of material within the tiltable section of the bowl and consequent- 13*, a like amount of material may be handled with less expenditure of power thanheretofore in the art.

Inasmuch as this type of a scraper will handle a larger amount of dirt it is advisable, due to the increase of the load, to provide antifriction bearings I8 in the swivel support 6a carrying the spaced forwardly at all times from forward end of frame section In on the carriage la, as illustrated in Figure 7.

It is important to note that due to the construction of the sectional bowl, and especially the rearwardly slanting front edges of the tiltable section of the bowl, there is not sufficient past center weight to counterbalance the tiltable section when in dumping position. If the front section of the bowl was moved or tilted, or the front edges of the rear or tiltable section were vertical instead of slanted obliquely rearwardly, the bowl would tend to remain in dumping position and would not in all cases freely gravitate to carrying position, and in extreme dumping position the vertical edges would tend to gouge the ground in turning and thereby bend or damage the apparatus.

Furthermore elimination of wear and other advantages of our apparatus may also be ascribed to having the stationary front section of the bowl the tilt-able rear section of the bowl, it being unnecessary to move the tiltable section into overlapping relation with the stationary section except when dumping the load. Moreover the apron is at all times spaced forwardly of and does not overlap the tiltable section. Thus, the load is divided into three distinct portions located and held respectively in the tiltable section, the fixed section and the apron.

Considering the apron as a part of the bowl, such bowl may be said to comprise three sections wherein the middle section is fixed and the other sections are disposed on opposite sides and contiguous with the fixed sections and are relatively adjustable for carrying and dumping portions of the load as well as for causing the fixed section to carry and dump its share of said load.

We claim:

A scraper including a carrying frame, a bowl mounted on the frame and made up of three load-carrying sections, the centralbowl section including side plates fixed to the frame and a scraper blade fixed between said plates, another of such bowl sections being pivoted to swing up and down on an axis to the rear of and adjacent said blade and extending backwardly beyond the rear edges of the side plates of the central bowl section, the third bowl section comprising an apron pivoted for swinging movement away from or toward the front edge of the cutting blade, means to swing the second and third sections on their respective pivots, and means to lower or raise the scraper blade to or from scraping position.

MAX M. BRODERSEN.

LEN O. BIRD.

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