US2090117A - Road scraper - Google Patents

Description

37- w. E. GLEDHILL 2,090,117

' FOAD SGRAPER Filed July 20, 1956 2 Sheets-Sheet l awwmboo A Z. Qiedfiili.

Aug. 17, 1937.

w. E. GLE DHILL ROAD SCRAPER Filed July 20, 1936 2 Sheets-Sheet 2 m5. 7am Z'ZZ;

Patented Aug. 17, 1937 UNITED STATES PATENT OFFICE ROAD SCRAPER William E. Gledhill, Gallon, Ohio Application July 20,

7 Claims.

This invention relates to road scraping machines and more particularly to a weight adjuster for the same.

One object of the invention is to provide a road I 5 scraping machine with a weight adjuster which is so associated with the chassis and the road engaging blades that the efifective weight applied to the scraping blades may be controlled. This permits the road scraping machine to be very 10 effectively adapted to the type of material from which the road is formed and eliminates excessive drag and also undesirable wear upon the blades and the runners forming part of the machine.

Another object of the invention is to so construct the weight adjusting means that it may be applied to a road scraper having a construction such as shown in Patent No. 2,021,660, issued November 19, 1935 to E. C. Gledhill, et al., or to other road scraping machines of this general type. When a road scraper of the type referred to above is in use and adjusted so that the runners and blades are in engagement with the surface of the road, the runners and the scraping blades are subjected to the weight of the chassis and other elements of the machine. This weight I is often too great and causes excessive wear upon the runners and the blades and also makes it very difiicult for a small truck, such as a one and one-half ton truck, to drag the scraper along a road.

It is, therefore, another object of the invention to so construct the weight applying means that when the machine is in use, any desired pressure 35 or weight may be applied to the blades and the runners and this weight towhich they are subjected increased or decreased when found necessary to do so.

Another object of the invention is to provide 40 the road scraping machine with a weight regulating device which is simple in construction, strong and durable and very easy to adjust.

The invention is illustrated in the accompanying drawings, wherein Figure 1 is a view showing the improved road scraping machine in side elevation.

Figure 2 is a fragmentary view showing the weight applying and regulating mechanism upon an enlarged scale and illustrating the manner in 5 which it is adjusted by dotted lines.

Figure 3 is a view in elevation looking from the right in Figure 2.

| Figure 4 is a sectional view taken along the line 4-4 of Figure 2.

55 The road scraping machine on which the im- 1936, Serial No. 91,583

proved weight applying and regulating mechanism is mounted has a chassis, indicated in general by the numeral I, and is provided with the usual chassis bars 2. Front and rear wheels 3 and 4 are provided and there has also been provided a tongue 5 by means of which the road scraper may be hitched behind a truck and drawn along a road. There have also been provided elongated runners 6 corresponding to the runners of the road machine disclosed in Patent No. 2,021,660, issued November 19, 1935, and also a scraper 1 corresponding to the road engaging scraper of the prior patent referred to above. The scraper is vertically adjustable relative to the runners and has adjusting means correspond-- ing to the adjusting means disclosed .in the before mentioned patent and actuated by shafts 8. In addition to adjusting the scraper relative to the runners, the runners and the scraper are shiftable vertically as a unit relative to the chassis through the medium of the links or lever arms 9 and the hydraulic lift 10. When such a machine is in use, it is drawn along a road with the runners and the scraper in an elevated position until the place of use has been reached."

The runners and the scraper are then lowered until the runners make contact with the surface of the road and the scraper adjusted so that a scraping action takes place as the machine is dragged forwardly. Engagement of the runners with the surface of the road causes the chassis and the ground engaging wheels 3 and 4 to be shifted upwardly and therefore the entire weight of the chassis and mechanism carried thereby is brought to bear upon the runners. excessive weight to be applied to the runners and the runners are quickly worn out. It has also been found that it is very difficult to drag the road machine along the portion of the road to be worked upon with a small truck.

In order to overcome the objections noted above and permit the weight of the chassis to be supported by the road engaging wheels 3 and 4, while at the same time, subjecting the scraper and the runners to sufficient pressure, the improved weight applying and controlling mechanism constituting the subject-matter of this invention has been provided. This weight applying and controlling mechanism has been shown in operative relation to the scraper and the chassis in Figure 1 and is illustrated in detail in Figures 2, 3 and 4. Referring to Figures 1 and 2 it will be seen that cross bars II and 12 formed of angle metal extend transversely of the chassis and are secured to under faces of the chassis bars This causes 2. A hanger or bearing bracket l3 projects forwardly from the cross bar It with its arms extending downwardly below the lower edge of the cross bar and serves as a mounting for a yoke l4 which is pivotally mounted between arms of the hanger by pins l5. The yoke is of an elongated U-shape formation and the lower ends of its arms are pivotally connected with the laterally extending upper end portion of a link l6 by a bolt H. The lower end of the link is pivotally mounted between bearing plates !8 by .a bolt l9, the bearing plates being carried by a bracket 20 rigidly carried by a portion of the scraper I and from an inspection of Figure 2 it will be readily seen that pull exerted forwardly of the chassis upon the yoke I l will urge the upper end of the link [6 forwardly and pressure will be exerted downwardly upon the scraper. By regulating the pressure exerted, the scraper may be subjected to a predetermined weight or pressure and the scraper caused to have the desired slicing and scraping engagement with the surface of a road to remove high spots and cause the material scraped from these high spots to be spread across the road and low spots filled. Therefore, a very good planing action will take place with the runners serving to prevent the scraperfrom sinking into low places in a road surface. The weight of the chassis will be borne by the ground engaging wheels and, therefore, the pressure or weight applied to the scraper may be controlled instead of the scraper and runners being subjected to the entire weight of the chassis and elements carried thereby as would be the case if the ground engaging wheels were out of contact with the road.

Force exerted against the yoke M is obtained from a strong helical spring 2i which extends longitudinally of the chassis intermediate the width thereof between the cross bars H and I2. The forward end of the spring is engaged with a hook 22 at the rear end of a threaded stem 23 which passes through an opening formed in the cross bar It and carries nuts 24 by means of which the stem may be adjusted to regulate tension of the spring. At its rear end, the spring is engaged through an opening formed in the shank 25 of the forks 26 which straddle the yoke I4, as shown clearly in Figure 3, with their rear ends pivotally mounted upon a rod 21. This rod 2'! extends transversely of the yoke in engagement with the rear edge faces of its arms and the intermediate portion of the rod is welded or otherwise fixedly secured to a nut 28 disposed between the arms of the yoke and threaded upon an adjusting shaft 29. The shaft 29 extends longitudinally of the yoke between arms thereof with its upper portion journaled through the bridge 39 of the yoke with its upper end portion protruding from the yoke and carrying a hand wheel 3| by means of which the shaft may be turned. When the hand wheel is turned to rotate the shaft, the nut will be shifted longitudinally of the yoke and the forks 26 will be shifted with the nut longitudinally of the yoke. Therefore, the distance between the pivotal mounting of the yoke and the point at which the rod 21 engages edge faces of the arms of the yoke may be adjusted and leverage regulated. When the forks are in the position shown in full lines in Figure 2, the greatest leverage will be exerted and as the nut is shifted upwardly to move the forks towards the position indicated by dotted lines in Figure 2, the leverage will be gradually reduced until the forks reach the dotted line position where no leverage is exerted and the scraper will not be subjected to weight or pressure by the springs. It will thus be seen that the weight or downward pressure to which the scraper is subjected may be accurately controlled. A very good scraping or planing action takes place without the runners being subjected to excessive wear by frictional engagement with the surface of the road. This also permits the scraper to be drawn along the road by a small truck during a scraping operation.

Having thus described the invention, what is claimed as new is:

1. In a road machine, a chassis having ground engaging wheels, ground engaging runners extending longitudinally of said chassis and shiftable vertically into and out of engagement with the ground, a scraper carried by said runners and extending under the chassis transversely thereof, a toggle structure extending vertically and pivotally connected with the chassis and the scraper, and spring actuated means for applying pressure upon the toggle structure in a direction to straighten the same, the said means being shiftable longitudinally of one member of the toggle into position to exert predetermined downward pressure upon the scraper.

2. A road machine comprising a chassis having ground engaging wheels, runners extending longitudinally of the chassis and shiftable vertically towards and away from the ground, a scraper. carried by said runners and extending under the chassis transversely thereof, a toggle structure mounted between the chassis and scraper, a power spring, and a connection between the spring and toggle shiftable longitudinally of one member of the toggle whereby leveragemay be controlled and the scraper subjected to predetermined downward pressure.

3. In a road machine, a chassis having ground engaging traction members, runners extending longitudinally of said chassis, a scraper carried by said runners and shiftable vertically relative to the runners, a toggle structure mounted between the chassis and scraper and when moved in a straightening direction exerting downward pressure upon the scraper, and spring actuated means for urging the toggle in a straightening direction having a connection shiftable longitudinally of one member of the toggle whereby leverage exerted thereon may be regulated.

4. In a road machine, a chassis having road engaging wheels,runners extending longitudinally of said chassis, a scraper carried by said runners and extending under the chassis, a toggle structure having an upper member pivoted to the chassis and a lower member pivoted to the upper member and to the scraper, a power spring, and an anchor for said spring connected with the upper toggle member and shiftable longitudinally thereof whereby leverage may be controlled and the toggle caused to exert predetermined downward pressure upon the scraper.

5. In a road machine, a chassis, runners extending longitudinally of the chassis, a scraper carried by said runners and extending under the chassis transversely thereof, a toggle structure having a lower link pivoted to said scraper and an upper yoke pivoted to said chassis and having its lower end pivoted to the upper end of the lower link, a power spring having one end connected with said chassis, an anchor connected with the other end of said spring, and a mount ing for said anchor carried by and shiftable along i'Z5 said yoke whereby leverage between the anchor and yoke may be regulated and the spring caused to exert predetermined downward pressure upon the scraper.

6. In a road machine, a chassis, runners extending longitudinally of said chassis, a scraper carried by said runners and extending under the chassis transversely thereof, and means for applying controlled downward pressure upon said scraper, said pressure applying means comprising a toggle structure disposed vertically between the scraper and chassis and having an upper yoke pivoted to said chassis and a lower link pivoted at its lower end to the scraper and having its upper end pivotally connected with the lower end of said yoke, a shaft extending longitudinally of said yoke and being rotatably carried thereby and threaded, a mounting threaded. upon said shaft and having movement longitudinally of the yoke to adjusted positions thereon. when the shaft is rotated, a spring having one end connected with said chassis, and an anchor for the other end of said spring connected with said mounting.

7. In a road machine, a chassis, runners extending longitudinally of the chassis, a scraper carried by said runners and extending under thechassis transversely thereof, and means for subjecting the scraper to predetermined downward pressure consisting of a toggle structure having a lower link pivoted at its lower end to said scraper and an upper yoke pivoted intermediate its ends to said chassis and having its lower end pivotally connected with the upper end of said link, a shaft extending longitudinally of said yoke between arms thereof and rotatably carried by the yoke, a block in threaded engagement with said shaft disposed between the arms of said yoke and held against rotation thereby whereby the block will be shifted longitudinally of the yoke when the shaft is turned, a rod carried by said block and having end portions projecting from opposite sides thereof beyond arms of the yoke in engagement with edge faces of the arms of the yoke, a fork straddling said yoke and pivotally connected with the projecting end portions of said rod, said fork extending forwardly from the yoke and having an eye at its forward end, a spring extending longitudinally of said chassis with its rear end engaged through the eye of said fork, and a mounting for the forward end of said spring carried by said chassis and adjustable longitudinally thereof for regulating tension of said spring.

WILLIAM E. GLEDHILL.

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