US1319951A - Ground-breaking device - Google Patents

Description

aD. ERIER.

GROUND BREAKING DuEvlcL y APPLICATlaN ElLEDHMRJzs, 1915; 1,319,951. I Pmnted oct. 28,1919.

2 SHEETS-SHEET 2.

UNITED STATES PATENT FFIQE.

DAVID ERT'ER, OF SPRINGFIELD, OHIO.

GROUND-:BREAKING- DEVICE.

Specification of Letters Patent.

Patented Get. 28, 1919.

` .Application filed March 25, 1915. Serial No. 17,006.'

` of which the following is a specification.

This invention relates to ground break- ,ine devices and more particularly to de- 25 f vices which areV adapted to be attached to a road roller to permit the lattervto act as a scarifier.

One'of the objects of the invention is to lprovide a mechanism of this' classwhich may vbe'readily attached to a road roller. in

the field so as to avoid-taking the machine out of service and sending it to a factory to have the attachments added thereto.

Another object of the invention is to provideV apparatus of the class described which will be adapted to break up oiled roads, the surface of which has become so caked that ordinary scarifying machines cannot be used on account of becoming clogged.

A further object is to provide an improved form of'cushioning mechanism for the scarifying apparatus, which will be capable of withstanding the severe service to which it is subjected.

With the foregoing and other objects in view, as will appear from the followingdescription, the invention may be embodied in various forms of apparatus, some of which are illustrated inv the accompanying drawings. j

In the drawings Figure ,1 is a side elevation of the rear portion of-a road roller, having one form of my invention applied thereto Fig. 2 is a rear'elevation of the same;

Fig. 3 is a view similar to Fig. 1 showing another form of the invention; Fig. 4 is a rear elevation of the mechanism shown in Fig. 3.-

Referring to the drawings, the rear wheels of a road roller are shown at 10 and the usual tank, at the rear of the machine, is

indicated at 11. The usual draw-bar with which road machines are ordinarily equipped is indicated at 12, this draw-bar being rigidly secured to the rear of the tank 11.

In accordance with my invention, brackets 13 and 14 are secured to the draw-bar 12 and rotatably support a horizontal shaft 15. The shaft 15 has keyed thereontwo sets of alternately arranged arms 16 and 17 Az; shown inFig. 1 the arms 17 are shorter 'than the arms 16 and are inclined at a greater angle so that the digging spikes 1S carried bythe arms will be arranged in stag'- gered relation. The spikes 18 are secured to the arms by having theends of the latter split, as indicated in Fig. 2 and clamped by means of bolts 19. An upwardly projecting arm 2O is keyed to the shaft 15 land has pivotally connected with the upper end thereof a link 21 which is also pivotally connected with downwardly projecting lugs 22 on va cylinder The cylinder is slidably supported on the stationary tubular piston rod 24 which has secured thereon a stationary piston 25. The rod 24 is supported -in brackets 26 and 27 which are secured to i the tank 11. The brackets 26 and 27 also vsupport guide rods 28 and 29 arranged on opposite sides ol' the cylinder' and engaged by oppositely projecting lugs 30 on the cylinder.` A control valve 31 of any suitable form, such as .an ordinary four-way cock, 1s connected with the opposite ends of the'rod 24 by pipes 32 and 33, as clearly shown in Fig. 1. f The valve 31 is indicated more or less diagrammatically anda supply pipe 34 is shown as being connected with the underside thereof. The usual eX- haust pipe is indicated at 35. The rod 24 is preferably in two parts connected with the opposite sides of the piston 25 and provided with perforationsBG for the passage of apressure iuidfor. actuating the cylinder 23.

As shown in Fig5 1, the-parts arein the position in which the spikes 18`dig up the ground. The cylinder 23 is held in the position shown by the pressure fluid which is admitted to the space on Athe lefthand side of the piston by the val've 31.

As the machine moves forward the spikes tear up the ground and, on vaccount of the staggered relation of the spikes, and the spaces between the arms 16 and 17 there will'be little or no clogging when an oiled road is dug up. In digging up an oiled road the surface is usually so caked that it comes up in the form `of a sheet and this sheet will be broken up by the arms 16 and 17. When any of the spikes strikes an 'mmovable obstruction, the spikes will e lifted high enough to permit them to pass over the obstruction, the cylinder 23 moving to the right a sufficient distance to accommodate the necessary lifting. of the spikes. The cylinder 23 thus acts a cushioning device and as soon as the obstruction has been passed over the pressure will move the cylinder toward the left and force the spikes into the .ground again. It will be observed that the parts are so arranged that the force eX- erted on the spikes will be substantially uniform irrespective of the depth of penetration into the ground. v

Refeiring now to Figs. 3 and 4, it will be seen that the shaft 15 and arms 16 and 17 and the digging spikes 18 are the same as in F igs.-1 and 2. In this form of the invention, however, the arm 20 .carries a quadrant 3T which is provided with the gear teeth 36. The teeth38 are arranged concentric with the axis of the shaft 15 and mesh with the teeth of a pinion 39 on a shaft 40. The shaft 40 is supported in bearingbrackets41 which are secured to a suitable frame 42 on the side of the tank 11. rlhe shaft 40` also carries a gear wheel 43 which meshes with a pinion 44 on the crank shaft 45 of an oscillatingengine 46. The engine 46 may be of any preferred construction and since it is a connnon article of trade it is only shown diagrammatically in the drawings. The engine 46 is provided with the usual supply and exhaust pipes 47 for the motive fluid and when the spikes 1S are in the ground the pressure of the motive fluid tends to rotate the shaft 44 in the direction to force the spikes into the ground so that when the spikes meet an immovable obstruction the movement ofthe quadrant 37 will rotate the shaft in opposition to the pressure fluid so that the engine 46 will act as a cushioning device and restore the spikes to their normal depth of penetration as soon as the obstruction has been passed.

lt will be seen that in both forms ofthe invention shown the parts which are attached to theroad machine are of such a simple nature that the work of securing the parts to the machine, being also of a simple nature, may be done in the field and without making it necessary to send the machine to a factory for that purpose. lt will also be seen that the simplicity of the mechanism lwill make .it durable and eflicient in operation and, since the parts are attached to the rear of the machine and the arms 16 and 17 have a rocking movement, the machine itself will not be subjected to an excessive amount of jarring and jolting.

Having described the invention what' is claimed is: y

1. The combination witha road machine, a shaft attached to the rear thereof, a

groundbreaking device non-rotatively ating breaking points pivotally mounted at the rear of said member, alternate arms being of different lengths and having dierent angular positions on said shaft whereby adjacent breaking points will be in different lines transversely of the machine, a cushion-ing device attached to the side of said member, and means operatively connecting said ground breaking device and cushioning device.

3. The combination with a road machine, of a horizontally arranged rock shaft attached to the rear thereof, arms secured on said shaft and spaced apart laterally thereon, separate ground-breaking devices carried by each of said arms, an upwardly projecting arm secured` on said shaft, a cylinder'l slidingly mounted substantially over said shaft and having a downwardly projecting lug, a link connecting said lug and arm, a stationary piston in said cylinder, and means for supplying a pressure fluid to said cylinder on opposite sides of said piston.

In testimony whereof aiixmy signature.

navin narnia.

Images