US1384077A - Road-construction machinery - Google Patents

Description

IIt P. II/IARTIII. ROAD cKoIIsIIIu'cTIoII MACHINERY.

APPLICATION FILED APR. 23.`I92II I 193545270 Paemd July WZL,

2 SHEETS-SHEET l.

NETE@ PATENT @FFTQ HARRY P. MARTIN, OF CLEARFIELD, PENNSYLVANIA,

Roan-CONSTRUCTION MACHINERY.

ass-inea To all whom t may concern:

Be it known that LHARRY P. MARTiN, a citizen of the United States, and a resident of Clearfield, county of Clearfield, and State of Pennsylvania have invented an Improve-- ment iii Road-onstruction Machinery, of which the following is a specification.

This invention relates to road construction machinery and more particularly to machinery adapted to the distributing of road-making material over the roadbed.

One of the objects of the invention is to provide practical and reliable means that will operate regardless of the slope or character of the ground upon which it is set up.

Another object is to provide a simple and eHective means, readily movable from place to pla-ce, whereby trucks and the like may be mounted thereon and revolved into any position desirable onl the roadbed before dumping the material; to also offer an effectivev means of distributing the contents of the truckor the like, by dumping the same while the truck is being bodily rotated.

Another obj ect of this invention is to provide a turntable that is rugged in structure, easily manufactured from readily obtainable material of a commercial section, and

adaptable in every respect to concrete road construction.

n the construction of pavements, concrete roads, and the like', it is-necessary to set forms for the retaining of concrete and other material. Since standard State highway roads are generally eighteen feet or less in width, it is impossible to turn a truck or the like without damaging the forms set to limit the width of the concrete roadbed. Furthermore, such an attempt to turn or position a truck, which is usually about fourteen feet in length, would result in a blocking of the passage and of forcing other trucks to lie idle during this period. rIhis of course limits the speed of construction and hinders progress in many other respects. it is therefore desirable to bodily rotate the trucks into position for the pouringof concrete and other materials. The ordinary structures obtainable for this work, while they may be able to position the trucks, are so large that they obstruct permanently the passageway between the molds and are accordingly detrimental as hereinbefore pointed out.

VThis invention, among other objects, aims Specification of Letters Patent. Pgabgmgd July 12.9 19219 Application filed April 23,

1921i.. Serial No; 463,912.

to' provide a simple, rugged structure that will quickly and effectively position the Atruck as desired and one that will only obstruct 'the passageway temporarily while the truck is in a position perpendicular to the` -sides of the road. This, of course, greatly facilitates the handling and hauling of the material, and as a result a maximum amount of work at a maximum speed is possible.

In the accompanying drawings, in which is shown one embodiment of this invention by way of example and in which similar reference characters refer to similar parts thereof,

Figure l is a top plan view, the dotted position being that assumed by the structure when the` truck is to be turned perpendicular to the roadbed'; l

Fig. 2 is a side elevation of Fig. l;

Fig. 3 is a detailed drawing of a portion o f Fig. l, showing the method of construction;

Fig. 4t is a-side elevation of F ig. 3, showing one of the supporting wheels of the structure and also a wheel of a truck mounted thereon; and

Fig. 5 is a cross-section of Fig. 3 on the line 5 5.

Referring to the drawings of the illustrated embodiment and more particularly to Fig. l, 'the numeral 10 designates the main body members which are rigidly fixed together by the transverse members l1 to form the rotatable part of the structure. Upon these main body members, which are preferably made from ordinary channel beams, the

bearing, which will be more fully described l hereinafter, the wheels operating on the track l2 aiding inthe operation when necessary. The power for this purpose may be supplied by a few men, or in any other convenient manner. t will be seen that the entire structure is readily laid between the molds 13, which limit the width of the road-y bed, and that the structure ordinarily occupies but one-half of the road or passageway. Tt does temporarily occupy the entire passageway when it is desired to turn the structure perpendicular to v the roadbed, as is shown in the dotted position of Fig. l, but since it remains in this position only momentarily, the obstruction is of insufcient duration to be a. material detriment to the be seen that the ends of the transverse memj bers 11 are securely and rigidlyfastened to 'the main body members 10 by means of the angle irons 20 and the rivets 21. Mounted upon the main body members 10 are the wheel chairs 15 in which the wheels 16 are fixed in any suitable manner, as by inserting their axles through the apertures 17 provided therefor. These chairs are preferably xed to the main body members by.

means of'the bolts 42 inserted through the apertures 18. The track 12,I upon which these wheels operate, is preferably made in four 'sections of any suitable material and is secured by bolts inserted through the apertures 19 to any suitable framework 45. Such a frameworkmay be constructed by rigidly4 fastening the boards 44 to a pair of skids or runners 43, adding suitable braces if necessary, without exceeding a height of 3 inches. 4The main base member 23 is mounted on the framework 45 at substantially the center of the track. r1`he skids or runners 43, in addition to providing a rigid framework, facilitate the removal of the structure from place to place along the roadbed as the work progresses.

- .Thetransverse members 14, whose ends are rigidly fastened to the main body members by the rivets 22, in addition to bracing the members 11-and making a rigidtable out of the main body members, have another function which will now be more fully described. Referring particularly to Fig. 5, it will be seen that the members 14 are bent into substantially an arched shape to accommodate the thrust ,bearing 41. This arch is formed in any convenient manner, as

' by vbending the above members at the four points 28, 29, 30 and 31, forming the straight portions 32, 32, 33, 33 and 34. Part 34 is of sufficient length to accommodate the pivoting part 27 of the main thrust bearing. The beams are bent downward at the points 29 and 30 andupward at 28 and 31,`

so that the extreme ends are substantially parallel to the member 34, but nearer to the ground. The arch thus formed must not be bent up in excess of the road clearance of the trucks to'be carried. Themain thrust bearing 41, constructed to have a low center of gravity, consists of the main supporting base member 23 and the pivoting member 27. The base member 23; has a concave spherical recess in its upper end. rl`he .pivoting member 27, which is rigidly xed'by means of the rivets 25 to the members 14, has its lower end in a convex spherical form, to coperate with the concave recess in the upper end of the base member. These two members form a kind of ball and socket essaim? joint which primarily centers, but in addition aids in the support of the table portion and permits the rotation thereof. It also allows slight movements perpendicular to the plane of rotation without ,causing any stresses in the bearing.- This latter is found very desirable, especially when the load goes on or off the table. An aperture 40 is provided in the pivoting member for the admis sion of a lubricant, such as oil, to the surfaces 24 and 26 of the bearing.

It is usually impractical to make the i upon the size of the loads to be handled I and its length will depend upon the length of the channels, which in turn will depend upon the length of the truck, generally about 14 feet.

Fig. 4 shows a wheel 37 of a vehicle mounted on one of the main channel members 10. It is readily'seen that the flanges 35 and 35 and reinforcing members 36 and 36 prevent the wheels of the truck from sliding or running off the main channel members when the truckis once started on the table.

It is desirable that the main body members be as near the ground as possible, so that trucks may be mounted thereon with comparative ease. However,'these members must be sufficiently high to clear the molds 13 when the structure 1s revolved in a position perpendicular to the roadbed. This l height, of course, is determined by the height of the wheels 16 and the size of the thrust bearing and arch. It is desirable that the arch be sufficiently large-to accommodate a comparativelylarge thrust bearing without causing the main body members to be unnecessarily. high. A

1t will be seen that this entire structure is easily laid, since it is comparatively light and consists of a minimum number of parts and is likewise easily removed. No exact centering is required since the track is sufliciently wide to permit slight errors in the positioning thereof. It also effectively performs its function without obstructing. per.-

manently more than one-,half of the road-` way. It will be further noted that there is above provided in this invention a structure of simple and inexpensive construction and highly eflicient action.

As various embodiments Vmay be made in the invention above set forth and as many changes .mightbe made in the structure hereinbefore described, it is to be understood that all matter herein set forth is to be interpreted as illustrative and not in a limiting sense.

l claim as my invention:

1. In a device of the class described, in combination a track, Wheels operating on said track, a pair of substantially parallel girders adapted to carry a load, means substantially centrally positioned with respect to said girders and secured thereto to pivot said girders for rotation and for carrying part of the load on said girders, means substantially co-axial With said pivoting means and providing a supporting surface for said pivoting means and a plurality of arched transverse members cooperating With said girders and said pivoting means.

2. ln a device of the class described, in combination a track, Wheels operating on said track, a pair of substantially parallel girders adapted to carry a load, means substantially centrally positioned with respect 'to said girders to pivot said grders for rotation and for supporting part of the load on said girders, means substantially co-axial with said pivoting means 'and providing a supporting surface, a plurality of arched transverse members, cooperating with said main body members and said pivoting mea-ns, and a plurality of transverse members to aid the said arched transverse members in holding' the said girders in a definite position relative to each other.

3. ln a device of the class described, in combination a track, Wheels operating on said track, a pair of substantially parallel girders adapted to form a run-Way for a truck mounted upon said Wheels and an additional reinforcing member, coperating ivith and rigidly liXed to each of said girders, a series of transverse members coperating` With said parallel girders to hold said girders in a fixed position, relative to each other and a central thrustbearing rigidly fixed to a plurality of saidtransverse mem* bers.

4. ln a device of 'the class described, in combination, a track, Wheels operating on said track, a pair of substantially parallel girdcrs mounted upon said Wheels, a series ci' trans ferse members cooperating With said girders to hold said girders in a iixed position relative to each other. a central 'thrust bearing composed of a main pivoting :MmA

bei` and an additional base member cc ,Y ei

" "hereivw a device of class described,

combination. a 'track 'wheels en sai-,l trai-k, pair of ibstantial ders mounted on said ivheeis e av f verse mei. bers rigidly to each other, a supporting surface and a pivoting member cooperating with said supporting surface and rigidly fixed to a plurality of said transverse members.A

6. 4ln a device of the class described, in combination a track, wheels operating on said track, a pair of substantially parallel girders mounted on said Wheels adapted to form a runway for the Wheels of a. truck, a series of transverse members cooperating -With said girders to fix said girders substantially in a parallel position with respect to each other, a supporting surface and a pivoting member cooperating `with said supporting surface and rigidly fixed to a plurality of said transverse members, said plurality of transverse members being arched to receive said supporting surface and pivotihng member.

1. ln a device of the class described, in combination a track, Wheels operating on said track, a supporting surface and a pivoperating with said Wheels to facilitate ro' tation, a pair of main body members adapted to form a runway for a truck, and a reinforcing mcmber rigidly fixed to each of said main body members for transmitting a part of thc load on said members to the said pivoting load-carrying means.

9. ln a device of the class described, in combination a track, Wheels operating on said track, a centrally placed thrust bearing, a pair of main body members, and a plu rality of substantially arched transverse members rigidly fixed thereto, said arched members being rigidly fixed to said thrust bearing and adapted to permit a relatively large thrust bearing Without substantial raising of the tivo main body members.

lO. in a device of the class described, in combination a track, Wheels operating on said track, a centrally placed thrust bearing composed of a supporting surface and a ,pivoting member, a pair of cody members ru Wa'T a track and ibstantiailv arched ed, i i l adap f n rm a plnrairty o member, said arched mem f Y and ad large lent-iai raising of the tvo main f nation a track,

i4: l 1,384,077 Y said track, a lcentrally placed thrust bearing,`

a pair of main body members adapted to receive a truck and a pair of substantially arched transverse members adapted to be fixed to the said central thrust bearing with-- out substantial raising of the said main body members. f

l2. In a device of the class described, in

combination a track, Wheels operating on said track, a centrally placed thrust bearing composed of a main base member and a pivoting member, a pair of girders adapted to receive a truck and a pair of arched transverse members adapted to'be fixed to said centrally placed thrust bearing Without substantial raising of the said girders.

13. In a device of the class described, in combination a track, Wheels operating on said track, a Vcentrally placed thrust bearing composed of a main base member andA a pivoting member,a pair of girders adapted to receive a truck and a pair of arched transverse members adapted to befixed to said centrally placed thrust bearing, Without substantial raising of the said girders, an additional pair of transverse members to aid said arched transverse members in fixing said girders substantially parallel to each other.

14. In a device of the class described, in combination a track, Wheels yoperating on said track, a centrally placed thrust bearing, ra pair of main body members adapted to form a runway for a truck, a pair'of sub# stantially arched transverse members adapted to be fixed to the said centrally placed thrust bearing Without substantial raising of the said main body members, and a rein-v forcing member for each of said main body members and rigidly fixed thereto for transmitting a part of the load on said members to the said thrust bearing.

15. In a. device of the class describedin combinationI a track, Wheels operatingk on ting a portion of the load on said main body members to the said pivoting members andV a reinforcing member for each of said main' body members and rigidly fixed thereto for distributing the load on said members to the said pivoting means.

16. In a device of the class described, in combination a track, Wheels operating on said track, a pair of substantially parallel channelbeams, a runway for a truck formed by the flanges of saidvbeams, a reinforcing member rigidly fixed to each of said beams and forming an additional flange on each of said beams, a centrally placed` thrustbearing adapted to carry part of the load on said channel beams and to facilitate rotation,v a pair of substantially arched transverse members adapted to receive said centrally placed thrust bearing and to transmit a partof the load from said beams to said thrust bearing.

said beams, a centrally placed .thrust bear-v ing adapted to carry part of the load on said channel beams and to facilitate rotation, a

lpair Iof substantially arched transverse members adapted to receive said centrally placed thrust bearing and to transmit a part ofthe load from said beams to said thrust bearing and an additional pair of transverse mem- 4 bers to fix said beams in a definite position #relative to each other.

In testimony whereof, I have signed my name to this specification this fifth day of March, 1921./

H. P. MARTIN.

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