US2153897A - Scraper - Google Patents

Description

S. S. MOORE April 11, 1939.

SCRAPER Filed Aug. 51, 1936 5 Sheets-(Sheet l SSJVoore ATTORNEY April 11, 1939. MOORE 2,153,897

: SCRAPER Filed Aug, 51, 1936 3 Sheet-Sheet 2 INVENTOR 1 I S.S-

g v Q %Y S. S. MOORE April 11,1939.

SCRAPER Filed Aug. 51, 1956 5 Sheets-Sheet 3 S. S.M001"e ATTORNEY Patented Apr. 11, 1939 UNITED STATES PATENT OFFICE Application August 31,

7 Claims.

This invention relates. to wheel mounted tractor controlled scrapers and particularly represents improvements over the scraper in my copending application for patent, Ser. No. 4,064,

filed January 30, 1935, which issued as Patent Number 2,088,091 on July 27, 1937.

The principal object of the present invention pressure is exerted on the same and the tendency for the bowl to be deflected or warped and its supports to be strained when under load, is

eliminated.

The frame arrangement also has been improved with a view'notonly to increase its strength without any material increase in weight, but so that its appearance isenhanced and the scraper is made more suitable for overhead loading if desired.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views:

Figure 1 is a side elevation of the scraper in its scraping position.

Figure 2 is a similar view of the scraper in the carrying position.

Figure 3 is a similar view of the scraper in a dumping position. 4

Figure 4 is a top plan view of the scraper in the carrying position.

Figure 5 is an elevation of the swinging sheave unit detached.

Referring now more particularly to the characters of reference on the drawings, I denotes the side frames of the scraper, of trussed beam construction, converging at their forward end to support a deep bending standard 2 on the lower end of which a swivel two-wheeled truck 3 is mounted. The frame structure at its rear end is supported by transversely spaced wheel units 4.

The main' scraper bowl 5, which is disposed between the frames i and between the front and rear wheels is of any suitable form and includes 1936, Serial No. 98,653 (Cl. 37-426) a bottom plate 6 and side plates 1; the latter extending some distance in front of the scraper blade 8. The bowl is supported from the back near the bottom and at its sides by compression arms 9 pivoted on-the bowl as at H] and also axially of the rear wheels as at H.

Pivoted on trunnions 12, mounted on the frames l near the bottom of the same on both sides and toward the front end of the bowl, are bellcrank plates l3, disposed between the frames and sides of the bowl. The upper forward leg of each bellcrank is connected by an inverted L-shaped arm l4 to the adjacent pivot l0; while the other rear leg of the bellcrank is connected to the bowl adjacent the front of the same and below the bellcrank by a link l5, which is pivoted on said bellcrank and on a bracket l6 secured a to the adjacent side plate of the bowl.

The front apron or auxiliary bowl I! is swung from the trunniens l2 by forwardly extending arms l8 which are rigidly connected to, but are spaced from, the apron except toward the front, so that the side plates of the apron may overlap the side plates of the bowl inwardly of the same as shown. A cable l9 on each side of the bowl and apron, extends from a connection with the adjacent side plate I at its forward end over a pulley 20 mounted in a fixed position on top of the frame I, and down to a connection with the apron at the forward end of the arm l8. Downward movement of the front end of the apron is limited by the engagement of an overhanging stop bar 2| mounted on the apron at the top and front, with a ledge flange 22 mounted on and extending transversely of the frames I (see Fig. 2).

The control of the bowl and apron movement from the tractor to which the scraper is attached is effected as follows:

Extending from the usual power driven drum unit on the tractor is a single pull cable 23. This extends about a swinging pulley 24 mounted on one side of the standard 2, to and over a fixed pulley 25 mounted on top of the corresponding frame I, and then along said frame. Adjacent the rear end of the frame the cable passes over and between sheaves 26 fixed on the frame and sheaves 21 fixed on the corresponding arm 9. From the sheaves 21 the cable passes across. to the opposite side of the frame by a special guide pulley or sheave unit.

This unit comprises a pair ,of single pulleys 28 spaced transversely of the frames wlth'their axis extending lengthwise of the scraper, the housings of said pulleys being connected by a tubular member 29 disposed in a plane adjacent the top of said pulleys (see Fig. 5). Trunnions 30 parallel to the member 29 project beyond the pulley housings at the top and are turnable in bearings 3| secured on top of the housings of sheaves 26. The cable 23 from the lower sheave 2! can thenpass over and between the pulleys 28 without binding; the swivel mounting of the pulley unit compensating for the change in position of the adjacent run of the cable due to the vertical movement of the arms 9 as the cable is pulled or released. From the opposite pulley 28 the cable extends to one sheave 27 of the other arm 9, and then between said sheaves and another fixed sheave 26, and finally to an anchor on the frame or at said fixed sheave 26 as indicated at 32 in Fig. 4. In this manner a pull on the single cable 23 is imparted with equal intensity to both arms 9, so that both said arms have the same lifting effect and there is no tendency for the scraper to warp or be deflected laterally due to any misdistribution of the load in the bowl.

The length of the cable I8 is such that when the bowl is in a digging position as shown in Fig. 1, the apron is raised a considerable distance from the scraping blade 8 due to the relative decrease in length of the other run of said cable. With a pull on the cable 23 to raise the bowl to a carrying position, the bowl is first raised at its rear end. Such raising however at once imparts a forward movement to the arms M at their front end, causing the bellcrank l3 to be swung forwarclly and its rear leg to be raised. Since the bowl is connected to said rear legs by the links l5, the front end of the bowl is likewise raised from the ground. At the same time with the raising of the bowl, the adjacent run of the cable I9 is shortened while the other one is lengthened. The apron is thus relatively lowered until when the bottom plate of the bowl is substantially horizontal, the rear end of the bottom plate of the apron contacts the bottom plate of the bowl adjacent the scraper blade 8 as shown in Fig. 2.

As the arms 9 are raised still further the upward movement of the rear end of the bowl 5 is much greater than that of the front end, due to the fact that the forward end of the arms I4 then move but little from the carrying position. The front end of the bowl however is also moved back, swinging about the links l5, and as a result the adjacent runnings of the cable l9 are lengthened still more as shown in Fig. 3. This correspondingly shortens the other apron-attached runs of said cable and the apron is pulled still higher, or where it is not only well out of the way of the dirt discharging from the main bowl, but so that the bottom of the apron is disposed at a considerable downward slope that its contents will be positively discharged also. This feature enables me to use a relatively large capacity apron or auxiliary bowl, instead of the round-backed one previously employed, while insuring proper discharge of the dirt from the apron when the main bowl is raised to a dumping position.

From the foregoing description it will be readily seen that I have produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described my invention, what I claim as new and useful and desire to secure by Letters Patent is:

1. A scraper including a main bowl having a scraping blade, frames between which the bowl is disposed, a front dirt-carrying apron for the bowl, forwardly projecting arms pivoted on the frames and rigidly supporting the apron, pulleys mounted on the frames above the apron, a cable about and depending from each pulley, the for ward run of the cable being connected to the apron adjacent the front end thereof and the rear run of said cable being connected to the bowl adjacent the front end thereof; said cable being arranged so that when the bowl is in a scraping position the apron is above the blade, means mounting the bowl in connection with the frames for movement from a scraping through a carrying to a dumping position and arranged so that with the movement of the bowl from a scraping to a carrying position the rear run of the cable will be shortened, and will be lengthened with the movement of the bowl from a carrying to a dumping position whereby to also raise the apron, and control means to thus move the bowl; the arms being spaced from the side plates of the apron except toward the front thereof whereby the arms may be outwardly and rearwardly of the front end of the bowl while enabling the side plates of the apron to overlap the sides of the bowl inwardly of the same.

2. A scraper including side frames, a bowl disposed between the same, arms at the sides of the bowl pivoted on the bowl and on the frame for movement in a vertical plane, a single control cable extending along one side frame, and cable engaging members on the frames and arms over which said single cable passes unbroken and arranged so that a pull on the cable is transmitted with equal pressure to both arms.

3. A scraper including side frames, a bowl disposed between the same, transversely spaced arms pivoted on the bowl and on the frame for movement in a vertical plane, a single control cable extending along one side frame, upper and lower sets of sheaves on the frames and on the arms respectively and direction changing pulleys supported from the frames in position to direct the cable from one side of the frame to the other; the cable initially passing over one frame sheave, then down to and over the adjacent arm sheave, then up to the adjacent pulley and across to the other pulley, then over the adjacent frame sheave down to and about the corresponding arm sheave, and up to an anchor on the frame.

4. A structure as in claim 3, with a rigid tubular member connecting the housings of the pulleys and disposed substantially tangent to the top of the pulleys and through which the cable passes.

5. A structure as in claim 3, with a rigid member rigid with and extending between the housings of the pulleys, to form a rigid unit, and means mounting said unit at the top for swinging movement about an axis parallel to the pivotal axis of the arms.

6. In a scraper having a frame, a main bowl, a front dirt carrying apron to cooperate with the front of the bowl, and arms pivoted on the frame rearwardly of the front end of the bowl and ex tending forwardly to rigid connection with the apron, means supporting the bowl from the frame and including a pivot connection on the bowl adjacent its forward end and bottom, bowl moving means applied to the bowl to raise said pivot connection with the movement of the bowl between scraping and carrying positions and to then swing the bowl about-said pivot connection; a pulley mounted on the frame above the apron and bowl and a cable over the pulley, one end of the cable being fixed on the bowl at a point ahead of and normally above the pivot connection and the other end of the cable being fixed on the apron ahead of the bowl; the apron being held raised by the cable a predetermined distance from the bottom of the bowl at the front thereof when the latter is in a scraping position.

'7. In a scraper, a frame, a bowl, means hanging the bowl in connection with the frame for raising and upsetting movement in a vertical plane, a control cable extending lengthwise of the frame, upper transversely spaced sheaves mounted on the frame, lower similarly spaced sheaves mounted in connection with the bowl rearwardly of its hanging means and direction changing pulleys supported from the frame in position to direct the cable from one side of the frame to the other; the cable initially passing over one frame sheave, then down and over the adjacent bowl sheave, then up to the adjacent corresponding bowl sheave and then up to an anchor onthe frame. 1

STANLEY S. MOORE.

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