US1363346A - Grading-machine - Google Patents

Description

W. PILGER.

GRADING MACHINE.

APPLICATION FILED MAY 24. 1919.

Patented Dec. 28, 1920.

3 SHEETS-SHEET 1.

WV w WM. P/L GER.

W. PILGER.

GRADING MACHINE.

APPLICATION FILED MAY 24. 1919.

Patented Dec. 28, 1920.

3 SHEETSSHEET 2.

INVENTOR- Ww. P/L 613/"?v W. PILGER.

GRADING MACHINE.

APPLICATION FILED MAY24 1919.

1,363,346. Patented Dec. 28,1920.

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INVENTOP 54w. P/l. GER.

UNITED STATES WILLIAM PILGER, OF CENTER, COLORADO.

GRADING-MACHINE.

Specification of Letters Patent.

Patented Dec. 28, 1920.

Application filed May 24, 1919. Serial No. 299,428.

T all w ham it may concern:

Be it known that I, NLLIAM PILGER, a citizen of the United States, residin at Center, in the county of Saguache and tate of Colorado, have invented certain new and useful Improvements in Grading-Machines, of which the following is a specification.

My invention relates to grading machines used for leveling fields, roads and other surfaces, and its primary object is to provide in a machine of this character an earthscoop which discharges its load at its end opposite to that at which it enters and which is moved to the dumping position by a mechanism of simple and highly effective construction.

Other objects of my invention reside in the provision of certain adjustments and other devices which render the machine of practical use under varying circumstances and conditions.

With these and other objects in view all of which will fully appear in the course of the following description my invention consists of the construction and arrangement of parts which in their preferred form have been shown in the accompanying drawings in which like characters of reference designate corresponding parts throughout the several views and in which Figure 1 is a plan view of my improved grading machine in its preferred form,

Fig. 2, a section taken on the line 2-2, Fig. 1, and

Fig. 3, a sectional elevation showing a simplified form of the machine suitable for lighter work.

Referring first to Figs. 1 and 2 of the drawings, the reference character 2 designates the frame of a carrier which at its rear end is supported upon traction-wheels 3 and at its opposite end upon pivotally mounted caster-wheels 4.

A scoop 5 mounted at the forward portion of the frame is pivotally supported as at 6 to move about a horizontal axis extend ing beneath its bottom surface and adjacent its rear end.

The scoop is open at its front to receive the earth which is excavated by a cutting edge 7 at the forward end of its bottom 8, and its opposite end is normally closed by a door 9 which swings about hinges at its upper edge.

The scoop is suspended by longitudinally extensible links 10 from a lever 12 made in the form of a gallows frame which at the end of its parallel side members is fulcrumed in boxes 13 on the side sills of the carrier.

A Windlass 14 is provided to move the lever about its fulcrum for the purpose of bringing the scoop to its dumping position, and a chair 15 serves to support the lever 111 its normal position of rest in which it extends forwardly of its fulcrum with reference to the operative movement of the machine.

The windlass which is supported upon a platform 16 at the rear end of the carrier, comprises a winding drum 17 mounted between standards 18, and a ratchet 19 which cooperates with an adustable pawl 20 to hold the drum against retrograde motion.

The lever is connected with the drum through the intermediary of a multiple tackle consisting of pulley blocks 21 fastened at the free end of the lever and on a standard of the Windlass, and a rope 22 which at its ends is fastened to the other standard and to the drum of the Windlass and which is trained around the pulleys. Buffers composed of pivoted uprights 23, relatively stationary standards 24 and interposed springs 25 are mounted on the sills of the carrier frame to yieldingly arrest the movement of the lever when it is raised by the tackle to move the bucket to its dumping position, and a stop-bar 26 normally engages the door at the rear end of the scoop to brace the latter during its scraping action.

The bar is slidably mounted in brackets 27 on the under side of the latform which supports the Windlass and t e drivers seat 28, and it is connected by a rod 29 with a foot lever 30 which by movement about its fulcrum draws the bar out of engagement with the scoop to permit of its being brought to its dumping position.

A pair of draw-rods 31 at the front end of the frame connected by a link 32 provide ready means for sheathing the tractor by which the machine is pulled along the surface to be graded.

In the operation of the machine the parts are normally in the position shown in Fig. 2,

in which the lever 12 rests upon the chair and the bar 26 engages the rear end of the scoop which slants forwardly and digs into the surface with the cutting edge at the front end of its bottom plate, it being understood that by lengthening or shortening the link, the depth at which the cutting edge penetrates the ground is readily varied.

The forward movement of the machine causes the excavated dirt to enter the scoop which when full is moved to the dumping position shown in broken lines in Fig. 2 to discharge its load.

To bring the scoop to this position the lever is raised by winding the rope upon the drum of the Windlass after the stop-bar has been retracted by adjustment of its lever. When the scoop moving about its pivotal axis, nears the perpendicular, its door opens by the weight of the load and the latter is dumped on the ground.

To subsequently return the parts to their original position the pawl is separated from the ratchet, thereby permitting the lever with the suspended scoop to move by gravity until their movement is arrested by the engagement of the lever with the slanting seat upon which it isnormally supported.

The modified form of my invention illustrated in Fig. 3 is designed for lighter work than the machine hereinbefore described.

The lever is fulcrumed as at 33 upon a block 34 on the frame of the carrier and held in its. adjusted positions by a hand-adjusted detent 35 cooperating with a toothed segment 36 at the rear end of the wheeled frame which is provided with suitable means for sheathing one or more draft-animals by which the machine is drawn along the surface to be graded.

The scoop is, as in the first form of my invention, suspended from the lever by 1011- gitudinally extensible links. It is pivotally mounted between the sills of the frame by means of bolts 35 and it may be made without a door to close its discharge end, for reasons of economy and simplicity in operation.

Having. thus described my invention what I claim and desire to secure by Letters-Patent is:

1. A grading machine comprising in combination with a wheeled carrier, a pivoted scoop open at its ends, mechanism to turn the scoop about its pivot to a position in which its rear end is lowermost for the discharge of its load, and an adjustable stop on the carrier bracing the scoop in its oper ative position.

2. A grading machine comprising in combination with a wheeled carrier, a pivoted scoop open at its ends, a hinged door normally closing the opening at the rear end of the scoop, mechanism to turn the scoop about its pivot to a position in which its rear end is lowermost for the discharge of its load, and an adjustable stop on the carrier engaging the door and bracing the scoop in its operative position.

3. A grading machine comprising in combination with a wheeled carrier, a scoop pivoted near one end, a lever fulcrumed on the carrier, a link on the lever pivotally connected with the scoop near its opposite end, and a support for the lever.

41 A grading machine comprising in combination with a wheeled carrier, a scoop pivoted near one end, a lever fulcrumed on the carrier, a link on the lever pivotally connected with the scoop near its opposite end, a support for the lever, a tackle connected with the lever, and a Windlass on the carrier for lifting the lever off its support'through the medium of the tackle.

5. A grading machine comprising in combination with a wheeled carrier, a pivoted scoop, a bar slidable on the carrier, against the rear end of the scoop, and means to lock the harm an adjusted position.

In testimony whereof I have aflixed my si gn ature.

WILLIAM PILGER.

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