US1504352A - Road machine - Google Patents

Description

J. B. JARMIN ROAD MACHINE Filed June 11'. 1923 Fatented Aug. 112, 1924i.

JAMES B. JARMIN, OF SPOKANE, WASHINGTQN.

ROAD MACHINE.

Application filed. June 11, 1923.

T 0 all whom it may concern:

Be it known that 1, JAMES B. JARMIN, a citizen of the United States, residing at Spokane, in Spokane County and State of Washington, have invented certain new and useful Improvements in Road Machines, of which the following is a specification.

My present invention relates to improvements in road machines for use in grading, surfacing and reconstructing roads and for excavating ditches. The invention relates particularly to that type of machines employing a pair of scrapers or excavating blades, and is especially embodied in a frame for supporting these blades in parallelism, regardless of the position of the blades with relation to the scraper frame or machine. In this class of Work, and especially in ditching, it is essential for best results that the rear blade shall follow exactly in the tracks of the front blade of the scraping machine. And'this requirement is also es sential in road smoothers, drags and other similar implements. The two working blades are supported and maintained in parallelism and are adjustable to angular position by manipulation of a flexible frame, and by the utilization of my invention, regardless of the angular position of the blades, they are maintained in parallelism with their ends in alinement.

In the accompanying drawings I have illustrated the invention as physical-1y embodied in a scraper machine, but as this is one exemplification of the invention, it will be understood that other forms of blades or scrapers may be used without departing from the spirit of my invention as set forth in the appended claims.

Figure 1 is a perspective view showing the flexible frame and scrapers and connections.

Figure 2 is a diagrammatic plan view showing the angularly adjustable blades in parallelism, and in dotted lines showing the frame flexed and the scraper bars angularly disposed.

Figure 3 is a view similar to Figure 2, but showing the scraper blades in full lines and disposed at an angle opposite to that of the dotted lines of Figure 2.

The scraper blades are connected with a flexible supporting frame that is adjustable and jointed in order that the scrapers may be adjusted angularly to the direction of travel of the implement in order that the material scraped may be transferredto the Serial No. 644,626.

side of the road or ditch under construction; The scraper frame is of rectangular mshape, having at its rear a transverse or cross bolster 1, preferably of channel iron, and pivoted at 2 to a swivel head indicated as part of a yoke 2'. This yoke forms a stationary part of the implement, and the rectangular frame is swiveled to swing either to right or left over the surface of the ground with point 2 as a center.

Side bars 3 and 1 of the frame are also of channel bars and they are pivoted respectively at 5 and 6 to the ends of the swiveled rear bolster 1. The flexible frame is suspended from a metallic ring 7, which is horizontally disposed above the frame, centrally of the implement and supported in fixed bearings in order that it may be rotated about a fixed center, as indicated in dotted lines in Figure 1. In my application for Patent No. 644,625 filed June 11, 1923, means are illustrated for rotating or revolving this ring on its vertical axis. Depending from the rotary ring are a pair of diametrically disposed, vertical posts 8 and 9, each fixed at its upper end, as 10,to the ring, and it will be apparent as the ring is revolved or oscillated in a horizontal plane, these posts will move in a circular path with the ring. At their lower ends the posts are provided with journal brackets 11 that are attached at the outer sides of the respective side bars 5 and 6 of the flexible frame, and by these connections the rotary movement of the ring and posts is transferred into a swiveled or oscillatable movement of the flexible frame on, the swivel head 2.

There are two working blades or scrapers carried by the flexible frame, 12 being indi cated as the front blade and 13 as the rear blade, each having a reinforcing angle iron. 14 bolted at its rear and extending through out its length. In normal position these blades, which are at all times in parallelism, are disposed transversely of and at right angles to the longitudinal center of the scraper frame or implement, and are sup ported from the flexible frame in such manner that they may be swung to the angular positions in Figures 2 and 3 and yet maintain their parallelisnr' with the rear blade following the exact course of the front blade.

For connecting the blades with the flexible frame, two pairs of brackets 15 are employed, one pair for each blade, and the brace them and maintain them in upright position. The hooks however have a comparatively loose fit over the blades to permit angular adjustment of the latter, each on two pivots 18. These pivots may be bolts formed on the lower ends of the brackets and passed through the horizontal flanges of the angle-iron braces of the blades, and form vertically disposed supports for the blades in order that they may swing with the flexible frame.

Thus it will be apparent that by swinging the ring on its center C in Figure 1, through the instrumentality of the posts 8 and 9, the rectangular frame'is flexed at its pivotal connections 5 and 6, and the rear bolster 1 caused to oscillate on its swivel point 2. The blades, each of which has a pair of spaced pivotal supports on the flexible frame are swung about an axis with point C as the center, always in parallelism and with the ends of the rear blade directly on a line back of the ends of the front blade. In Figure 2, the blades, in dotted lines are swung to angular position in order that material may be swept to the right side of the roadway or delivered at the right of a ditch, while in Figure 3 the blades, shown in full lines, are swung to position to deliver mate rial at the left ends thereof. Thus the blades regardless of their angular position with relation to the longitudinal axis of the implement or the longitudinal center line thereof, havetheir complementary ends in alinement, and a line connecting thecomv plementary ends of the blades is parallel with the longitudinal axis or direction of travel of the implement.

By thisarrangement of parts the rear blade is made to follow in the exact path or course of the front blade, and the blades being duplicates in length have their longitudinal centers exactly in line with the iongitudinal center of the implement and also with the swivel point of the scraper frame or flexible frame. \Vith the blades thus equi-distant, as to their length, at the two sides of the longitudinal center of the implement, the strain or drag on the blades as they encounter the ground surface, is equally distributed at the sides of the longitudinal center of the implement. This equal distribution of strain permits facile guiding or steering of the implement whether horsedrawn or power-driven, and permits the implement to absorb vibrations or shocks as the scrapers travel over their course.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is l. The combination with the side bars of a flexible frame having a fixed pivot point, of a rotary member having a fixed axial center, diametrically arranged supporting members fixed to said rotary member and pivotally connected to said side bars, and a pair of movable blades carried by said side bars disposed equi-distant about said axial center.

2. The combination with a member rotatable about a fixed axial center, of a flexible frame having a fixed pivot point, diametrically disposed supporting members fixed to said rotatable member and having pivotal connection with the flexible frame, and a pair of spaced blades pivotally supported at diagonal points equi-distant from said axial center on said flexible frame. The combination with a rotary ring having diametrically arranged, fixed posts, with a flexible frame including a swiveled bolster, and pivoted side bars having pivotal connection with the fixed posts, a pair of parallel spaced blades, brackets on said side bars, and pivotal connections between said brackets and blades arranged on diagonal lines about the center of the ring,

In testimony whereof I aflix my signature.

JAMES B. J ARMIN.

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