US3288041A

US3288041A - Multiple-use paver

Info

Publication number: US3288041A
Application number: US387302A
Authority: US
Inventors: Jack D Layton
Original assignee: LAYTON Manufacturing CO
Current assignee: LAYTON Manufacturing CO
Priority date: 1964-08-04
Filing date: 1964-08-04
Publication date: 1966-11-29
Anticipated expiration: 1983-11-29

Description

Nov. 29, 1966 J. D. LAYTON MULTIPLE-USE PAVER Filed Aug. 4, 1964 Jack D. Layf'on A L 7-? n 13F 12: nl a I...

INVENTOR.

United States Patent 3,288,041 MULTIPLE-USE PAVER Jack D. Layton, Salem, 0reg., assignor to Layton Manufactoring Co., Salem, Oreg., a corporation of Oregon Filed Aug. 4, 1964, Ser. No. 387,302 Claims. (Cl. 94-46) This invention relates to paving 'machines or pavers, and more particularly to such machines including a hopper, into which is dumped aggregate for paving, and means cooperating with said hopper to spread the aggregate as it pours from the hopper.

A type of paving operation frequently performed today comprises surfacing a ditch or trench such as might have been prepared in an already paved surface for the purpose of receiving a water main, gas line, or other underground equipment. Ditches have widely varying widths, and any paver used in such paving operations should be readily adjustable to accommodate these differences in width. Further, any machine usable for ditch paving purposes preferably should also be employable for regular paving operations, such as paving a strip spanning some eight feet or more, as are found in the usual roads.

Generally, an object of this invention is to provide a new and improved paving machine, which is especially adapted to pave over ditches or trenches of varying widths.

Another object is toprovide such a paver, which can pave with equal facility strips of wide span such as are needed in the paving of an entire road surface.

More specifically, this invention features a paver including a hopper with an elongated bottom opening which extends transvensely of the paver, and novel out-off plates with opposed inner marginal portions functioning partially to close off this opening at the base of the hopper. The cut-off plates are shiftable relative to each other, to change the spacing between opposed inner edges of the plates, these inner edges defining opposite ends of what is referred to herein as an aggregate flow opening or aperture. With the plates shifted wide apart, a corresponding wide spacing is produced between these edges and an a ggregate flow opening of considerable length such as might be employed in the surfacing of a relatively wide ditch results. With the plates moved together, the opening is made smaller, to accommodate the paving over of narrower ditches.

In a paving machine adapted to pave an entire road surface with pavement strips of wide span, a transverse hopper may be provided in the paver having a length substantially corresponding to the width desired in the usual paving strip, and material flowing from the base of the hopper forms a strip as wide as the hopper. A screed trailing the hopper and moving over such material smooths and compacts it. To enable the paving of strips of wider span, What are referred to as screed extensions may be mounted on the paver, which are extensible from opposite ends of the hopper. Openings at the end of the hopper enable aggregate to allow laterally of the paver and against these screed extensions, and strike-off plates in the extensions plane the material to level it flush with the material compacted by the screed. According to this invention, additional cut-01f plates may be detachably mounted on these screed extensions, including opposed inner marportions that partially close off a portion of the opening at the base of the 'hopper. By adjustment of these screed extensions, the spacing between the cut-off plates may be changed to vary the size of the open space between the plates. Screed elevators may be mounted adjacent opposite ends of the screed to lift the screed slightly from the level of the paved surface containing the ditch. With this organization, intermediate portions of the screed only smooth out newly laid material.

Other objects and advantages are attained by the invention, and the same is described hereinbelow in conjunction with the accompanying drawings, wherein:

FIG. 1 is a perspective view of portions of a paver, including an elongated transversely extending hopper with an opening extending along the base thereof, and showing cut-off plates as contemplated partially closing this opena;

FIG. 2 is a perspective view of rear portions of the paver illustrated in FIG. 1, illustrating mechanism whereby a screed extension may be shifted laterally outwardly to one side of the paver;

FIG. 3 is a cross sectional view, taken generally along the line 33 in FIG. 1, showing how a cut-off plate is supported in the paver with such plate extending between forward and rear sides of the opening at the base of the hopper;

FIG. 4 is a perspective view showing portions of a cut-off plate removed from the paver; and

FIG. 5 illustrates diagrammatically how the paver operates when paving over a ditch.

Referring now to the drawings, and first of all more particularly to FIGS. 1 and 2, here a pa'ver is shown indicated generally at 10, including the usual frame 12 and an elongated hopper 14 mounted on this frame extending transversely of the paver. Ground-traveling means, such as the endless track partially shown at 1'6, may be mounted on either side of the paver adjacent the forward end thereof, for supporting the paver for movement over the ground.

The paver illustrated may perform the usual paving of an entire road surface, by laying down a strip of pavement as wide as hopper 14 is long. In such a paving op eration, a screed 18, which extends transversely of the paver and trails the hopper, travels over fresh aggregate after the material has flowed from the hopper, and smooths and compacts the aggregate. The screed includes along its base a screed plate 20 which actually slide-s over the aggregate while leveling it. During paving of a strip, the screed supports a portion of the weight of the paver, including the load in the hopper, as it will be obvious that the tracks in front only support the forward part of the paver.

The paver shown is towed behind a dump tnuck by means of tow arms (not shown) that project forwardly from the paver and are attached to the rear lateral support wheel assemblies of the truck. With the paver attached, the hopper has a position beneath rear portions of the dump body of the truck, and aggregate, when the body is raised, cascades from the dump body into the hopper. scribed are additionally disclosed in my copending applications entitled Apparatus for Attaching Trailing and Lead Vehicles, filed August 4, 1964, and Lift Mechanism, filed April 30, 1964, now Patent 3,237,539.

Considering now in more detail specific features forming the paver of this invention and referring additionally to FIGS. 3 and 4, hopper 14 comprises a forward wall 22, including a sloping upper portion 22a and a substantially vertical lower portion 22b, a rear wall including portion 24, and

side walls

26, 28. Between the rear wall and wall portion 22b, an elongated opening 30 is defined extending the length of the hopper along the base thereof. Detachable, removable cut-off plates 31, to be described in more detail below, are shown partially closing off the opening in FIG. 1.

Side walls

26, 28 have openings 3-2 therein which open up the ends of the hopper on either side of the paver. These openings are shown closed in FIG. 1 by cover plates openings by fasteners 35.

Payers of the general description so far de-' Aggregate flow through opening 30 is controlled by a gate 34, which takes the form of an elongated nonperforate plate binged at 36 to rear wall portion 24. In FIGS. 1 and 3, the gate is shown in a lowered position, however, the gate may be raised to swing its lower edge 34a upwardly and adjacent the forward wall of the hopper, to stop the flow of aggregate from the hopper.

Screed '18 which trails the hopper includes upstanding frame structure 40 including a wall 40a along the forward portion thereof. The screed is mounted adjacent each of its ends on rear wall portion 24 of the hopper through a universal such as universal 42 which includes a pivot 42a (accommodating pivotal movement about a horizontal transversely extending axis) about a pivot 42b (accommodating pivotal movement about a longitudinally extending horizontal axis). Pivot 42b is important in permitting crown and valley adjustments in the screed, not discussed here in any detail as it forms no part of the invention. Pivot 42a permits swinging of the screed as the unit about a horizontal transverse axis. The frame of the paver includes posts 43 carrying adjustable screw mechanisms 44 which are connected at their bottom ends to the screed. With adjustment of screw mechanisms 44, the screed may be swung relative to the hopper about the horizontal transverse axis described and provided by pivots 42a, and this effects the thickness of the pavement laid. With screed 18 swung toward the viewer in FIG. 2, the lower forward edge of the screed moves away from forward hopper wall 22.

Screed extensions such as the one indicated at 50 are provided in the paver to enable the production of a pavement strip having a span wider than the total length of the paver. Although one is obscured in the drawings, it should be understood that a separate screed extension is present on each side of the paver, the two being similar. Each screed extension includes a vertical strike-off or planer plate 52, and a vertical edger plate 54 disposed at right angles to the strike-off plate and joined to the outer end thereof.

Pipes

56, 58 which extend along the backside of the strike-01f plate are joined at one set of ends to edger plate 54, and are slidably received within guides such as guides 60 forming part of upstanding structure 40.

Pipes

56, 58 are tied together by a bracket 62 adjacent their set of ends remote from edger plate 54. It will be noted, as best seen in FIG. 3, that with a screed extension mounted in place its

guide pipes

56, 58 extend along the screed behind upstanding wall 40a of the screed, whereas the strike-off plate 52 in the extension is positioned in trout of wall 40a of the screed. Where strikeoif plates 52 are located behind gate 34- they form, in effect, a part of the rear wall of the hopper in the paver.

A screed extension is moved longitudinally of the hopper or laterally of the paver by means of a rack 64 secured to bracket 62, and pinion 68 mounted on a turn shaft 70. Shaft 70 is journaled on bearing 71 supported on plate 72, which is fixed to bar 73 of structure 40.

In preparing a strip of pavement having a span which is wider than the total length of the hopper, and considering first of all the widest span which may be produced with the paver, cover plates 33 are removed from openings 32 and cut-olf plates 31 at the base of the hopper are also removed. Both screed extensions 50 on either side of the apparatus are extended to the greatest extent possible using the turn shafts described which consitute actuating means for producing such movement. With aggregate dumped into the hopper and on the paver being towed forwardly over the surface to be paved, aggregate flows out through opening 30 to be leveled and smoothed by the screed trailing the opening. Aggregate also cascades out from the ends of the hopper through openings 32 and this aggregate is leveled and smoothed by the strike-olf plates described in the screed extensions. The edger plates form the margins of the strip being laid; If one or both of the extensions 50 are moved inwardly, a. narrower strip is produced. The specific width of a strip in 4 each case is determined by the spacing between the opposed edger plates 54. To produce a strip having a width equaling approximately the length of the hopper, the extensions are moved fully inwardly to positions where the edger plates completely close opening 32 at the ends of the hopper.

According to this invention, when it is desired to pave over a ditch bounded along opposite margins by already paved surfaces, openings 32 in the side walls of the hopper are closed using cover plates 33, opening 30 extending along the base of the hopper is partially closed by inserting cut-off plates 31, and the rear of the paver is slightly elevated from the level of the paved surfaces through elevators 84 fastened to the ends of the screed. With these adjustments, aggregate flows only from an in-. 'termediate portion of opening 32, and an intermediate por tion of the screed only is employedto smooth and level paving material. End portions of the screed, and the strike-off plates and edges of the extensions are maintained above pavement level, which eliminates wear in these parts.

Considering more specifically the construction of a cut-off plate, one of these plates is shown in FIG. 4 detached from the paver. The plate includes an upstanding flange 90, an expansive base 92, a horizontal flange 94 elevated from base 92, and an upstanding web 96 joining the horizontal flange and base 92. Along a margin of base 92, adjacent vertical flange 90, are a series of apertures or bores 98.

Each screed extension includes along the lower edge thereof a horizontal support flange or portion 100' which is joined to the strike-off plate in the extension. This flange has joined thereto upstanding pins 102 distributed along the length thereof. The support flange and pins constitute means for interlocking a cut-off plate and screed extension along one margin of the cut-off plate.

Vertical lower portion 22b of the forward hopper wall has detachably secured thereagainst an angle iron 104. This angle iron extends along substantially the length of opening 30. Flange 106 of the angle iron functions as a rail or track while supporting the forward edges of the cut-off plates when the latter are mounted in position as tially close off opening 30. Opposed inner edges of the 1 plates, shown at 110, 112, define the ends of what is referred to herein as an aggregate flow opening at the base of the hopper Cover plates 33 have bottom edges 116 positioned closely adjacent the top sides of the cut-off 1 plates, and prevent aggregate from cascading out the sides of the paver. Inside the hopper, gate 34 is placed with its lower edge thereof close adjacent the top faces of bases 92 in the cutoff plates. The gate has an overlying relationship with respect to supports 100 and pins 102, and

functions to shield these elements from aggregate.

Elevators 84 each may take the form of an angle piece 1 118, including a sloping front web 120 which acts as a. The elevators are detachably secured to'the 1 deflector. screed as by fasteners 122, which connect an elevator to a portion 124 forming part of the screed. With the ele-- vators in place, the bottoms of the elevators are somewhat below the base of the screed.

In paving over a ditch bounded by paved areas, and

referring to FIGS. 1 and 5, an aggregate flow opening is left between the cut-off plates which is substantially as long as the ditch which it is desired to pave over is wide. With the paver moved over and along the ditch, such as the ditch 134 in FIG. 5, material flows out through the opening and is leveled oflf along a plane which is slightly With two cut-off plates mounted in As previously discussed, the innermarginofscreed 18" moves toward and away fromwall22b of the hopper, on adjustment of screw mechanisms. This movement results in some lateral shifting of the cut-off plates relative to front wall 22b, since the cut-off plates move with the screed. Angle iron 104 accommodates such lateral movement. The movement, of course, is not so great as to cause flange 94 to move completely ofi flange 106 of the angle iron.

While an embodiment of the invention has been described, it is not thereby intended to be strictly limited thereto, as it is desired to cover all modifications and variations as would be apparent to one skilled in the art, and that come within the scope of the appended claims.

It is claimed and desired to secure by Letters Patent:

1. In a paver including an elongated hopper extending transversely of the paver, having an elongated opening extending longitudinally along the base of the hopper, said hopper including an upright forward wall defining the front side of said opening,

an elongated support substantially paralleling said opening, extending along the opening on the rear side thereof,

a horizontally disposed cut-off plate, including an inner rnanginal portion partially closing off said opening, and having a rear edge detachably locked to said support,

a horizontal track exposed to the inside of the hopper mounted on said forward wall,

said cut-off plate'having a forward edge slidably supported on said track, and

means for moving said support laterally of said paver,

with said support then producing corresponding movement in said cut-off plate.

2. In a paver including an elongated transversely extending hopper with an elongated opening extending along the length thereof at its base, and ground-traveling means supporting the hopper for movement over the ground; a pair of extensible devices mounted adjacent opposite sides of said paver, each of which is extensible laterally of the paver from adjacent an end of the hopper; each of said extensible devices including an elongated support which is exposed to the inside of said hopper and which extends along the opening adjacent the rear of the opening, said supports shifting laterally outwardly of the paver on extension of the devices; a cut-off plate mounted on each of the devices, each cut-off plate having an edge resting on a support of an extensible device; means detachably locking each cut-off plate to the support on which it rests; and guide means exposed to the inside of the hopper extending along the front of said opening movably supporting said cut-off plates; said cut-off plates having opposed inner edges adjustably spaced from each other by movement of said extensible devices.

3. The paver of claim 2, wherein said supports are movable laterally of said opening, said guide means comprises elongated rail structure extending longitudinally of said opening, constructed to accommodate movement of the cut-off plates both laterally and longitudinally of the rail structure.

4. In a paver including an elongated hopper having forward and rear walls and an elongated bottom opening extending along the length of the hopper between said walls; means supporting the hopper for movement in a lateral direction over 'the ground; an elongated shut-off gate within the hopper above said opening for cont-rolling the flow of aggregate through the opening, and means mounting said gate on one of said walls; an extensible device adjacent each end of the hopper comprising an elongated movable support extending longitudinally of the opening, said supports being adjacent one side of the opening and beneath the means mounting said gate on said one of said walls, and the shut-off gate being in coveringrelation over the support; opposed cut-off plates below said shut-otf gate with opposed inner marginal portions partially closing off said opening; said cut-off plates having a set of side edges supported on said supports; and means disposed with the shut-off gate in covering relation thereover detachably connecting said side edges of the cut-' off plates and said supports.

5. The paver of claim 4 which further comprises guide means exposed to the inside of the hopper extending along the side of said opening opposite its said one side, and wherein said cut-off plates have another set of side edges opposite their first-mentioned set of side edges movably supported on said guide means.

6. The paver of claim 5, which further includes a screed and the base of the screed is movable transversely of said opening, and wherein said supports are mounted on said screed, and said guide means accommodate movement of the cut-off plates in a direction extending transversely of said opening.

7. In a paver including a hopper having forward and rear walls for holding paving material, and a screed mounted adjacent the rear of the hopper with a plate along the base of said screed which is movable toward and away from the forward wall of the hopper on adjustment of the screed; an opening along the base of the hopper disposed between said forward Wall and said screed; an extensible device extensible laterally of the paver mounted on said screed and partaking also of the movements in the screed, said device including an elongated movable support extending along the rear of said opening exposed to the inside said hopper which support shifts laterally outwardly relative to the paver on extension of the device; a cut-off plate detachably locked to said extensible device having one edge supported by said support; and guide means extending along the front of said opening adjacent said forward wall which guide means supports said cut-off plate for movement in a lateral direction as produced by lateral movement of said support, said guide means also accommodating such movement in said cut-off plate as is produced by movement of said support on adjustment in the position of said screed.

8. In a paver including a frame and ground-traveling means supporting the paver for movement over the ground,

an elongated 'hopper mounted on the frame extending transversely of the paver having an elongated opening extending longitudinally of the hopper along the base thereof,

an elongated transversely extending screed, mounted on the frame rearwardly of the hopper and its said opening, adapted to smooth aggregate pouring from the hopper while supporting a portion of the weight of the paver,

an elongated upright strike-01f plate extending longitudinally of said hopper, adjacent each end of the hopper, and extensible means supporting the strikeoff plate for movement outwardly of the paver,

a horizontal cut-01f plate mounted on each of said strike-off plates, with an inner marginal portion partially closing off said opening,

said cut-off plates having opposed inner edges spaced from each other under said hopper and defining opposite ends of an aggregate flow aperture at the 'base of the hopper, and

a pair of screed elevators attached to said screed adjacent opposite ends thereof, respectively, each adapted to ride on a supporting surface while holding a screed end above said surface, intermediate portions of said screed in this position of the screed being operable to level off aggregate flowing through said aggregate 7. flow opening along a plane somewhat above the supporting surfaces upon which the elevators ride.

9. The paver of claim 8, wherein each cut-off plate is mounted on a strike-01f plate by detachable locking means connecting an edge of the cut-0E plate and strike-ofi plate, and wherein elongated rail structure is provided movably supporting an oppositeedge of the cut-01f plate.

10. The paver of claim 9, which further includes a gate mounted within the hopper abovesaid opening, for

controlling the flow of aggregate through the opening, and 10 References Cited by the Examiner UNITED STATES PATENTS CHARLES E. OCONNELL, Primary Examiner.

N. C. BYERS, Assistant Examiner.

Claims

1. IN A PAVER INCLUDING AN ELONGATED HOPPER EXTENDING TRANSVERSELY OF THE PAVER, HAVING AN ELONGATED OPENING EXTENDING LONGITUDINALLY ALONG THE BASE OF THE HOPPER, SAID HOPPER INCLUDING AN UPRIGHT FORWARD WALL DEFINING THE FRONT SIDE OF SAID OPENING, AN ELONGATED SUPPORT SUBSTANTIALLY PARALLELING SAID OPENING, EXTENDING ALONG THE OPENING ON THE REAR SIDE THEREOF, A HORIZONTALLY DISPOSED CUT-OFF PLATE, INCLUDING AN INNER MARGINAL PORTION PARTIALLY CLOSING OFF SAID OPENING, AND HAVING A REAR EDGE DETACHABLY LOCKED TO SAID SUPPORT, A HORIZONTAL TRACK EXPOSED TO THE INSIDE OF THE HOPPER MOUNTED ON SAID FORWARD WALL, SAID CUT-OFF PLATE HAVING A FORWARD EDGE SLIDABLY SUPPORTED ON SAID TRACK, AND MEANS FOR MOVING SAID SUPPORT LATERALLY OF SAID PAVER, WITH SAID SUPPORT THEN PRODUCING CORRESPONDING MOVEMENT IN SAID CUT-OFF PLATE.