US3557672A

US3557672A - Paving apparatus

Info

Publication number: US3557672A
Application number: US739373A
Authority: US
Inventors: Albert L Shurtz; Fabian J Leimeister
Original assignee: Individual
Current assignee: Individual
Priority date: 1968-06-24
Filing date: 1968-06-24
Publication date: 1971-01-26
Anticipated expiration: 1988-01-26

Abstract

A towed-type paver including a material hopper having a rearwardly and downwardly inclined front wall, a rear wall, and opposite sidewalls, the walls having lower extremities which mutually define a material discharge opening. A multisection shutoff gate is provided for the material discharge opening including a center section and side sections at each side of the center section. The center gate section may be moved alone between open and closed positions, and the side sections may be moved simultaneously with the center section between open and closed positions. A screed is provided adjustably mounted on the rear wall of the hopper and extending rearwardly therefrom. Vehicle- engaging arms extend forwardly from the hopper for selectively engaging a part of a towing vehicle, and a footactuated linkage is provided for selectively moving the engaging arms between an upper engaging position and a lower disengaged position. A heating system is provided for heating both the front wall of the hopper and the screed.

Description

United States Patent 1 [72] Inventors AlbertLShurtz Fort Wayne, lnd.;

Fabian J. Leimeister, Monroeville, Ohio [21] AppLNo. 739,373 [22] Filed June24, 1968 [45] Patented Jan. 26,1971 [73] Assignee said Leimeister, assignor to said Albert L.

Shurtz, Fort Wayne, Inc.

[54] PAVING APPARATUS 6 Claims, 10 Drawing Figs.

[52]" U.S.Cl.. 94/44 [51] lnt.Cl E0/c19/12 [50] FieldofSearch 94/44,46

[56] References Cited UNITED STATES PATENTS 2,197,878 4/1940 Robinson 94/44 2,252,691 8/1941 Amdt 94/44X 2,500,064 3/1950 Foster 94/44X 2,586,396 2/1952 Tramp1er.. 94/44 2,953,977 9/1960 Warren 94/46X 3,208,359 9/1965 Odell 94/44 3,230,845 1/1966 Mauldin 94/46 3,237,539 3/1966 Layton 94/46X 3,266,392 8/1966 Angelini 94/44 3,286,606 1 1/1966 Layton 94/45 3,373,669 3/ 1968 Schmitz 94/44 Prirr tary Examiner-Jacob L. Nackenoff Attorney-Hood, Gust & Irish section between open and closed positions. A screed is provided adjustably mounted on the rear wall of the hopper and extending rearwardly therefrom. Vehicleengaging arms extend forwardly from the hopper for selectively engaging a part of a towing vehicle, and a foot-actuated linkage is provided for selectively moving the engaging arms between an upper engaging position and a lower disengaged position. A heating system is provided for heating both the front wall of the hopper and the screed.

1 PATENTED m 26 m sutnunra FIG.IO

INVENTORS ALBERT L. SHURTZ FAB\AN J. LElMElSTER bf HooQGusT,

IRI HLUNDV A\'-orneys the hopper and the screed.

PAVING APPARATUS BACKGROUND OF THE INVENTION 1. Field of the Invention H This invention relates generally to paving apparatus, and more particularly to a paver of the towed-type'for spreading and compacting paving material, such as asphalt.

2. Description of the Prior Art One type of towed paver presently in ;use is shown in U.S. Pat. No. 3,288,04l to Jack D. Layton. That paver, which is commonly used for laying, compacting and smoothing asphalt on roads, driveways, parking lots and the like, includes a material hopper having a sloping forward wall whichin com bination with sidewalls and a rear wall define a material discharge opening, theopening being selectively opened and closed by a gate extending the entire length thereof. A screed assembly is pivotally mounted on the rear wall of the hopper and provided with means for adjusting the angle of attack thereof thereby to determine the thickness of the applied layer of asphalt. Screed extensions are 'adjustably mounted at each end of the screed assembly for selective transverse inward and outward movement. The width of the discharge opening may be selectively varied by blockoff plates attached to the screed extensions and moved inwardly and outwardly therewith. The paver is supported by tracks and towedby means'of arms respectively engaging the rims of the wheels of a towing dump truck which thus dumps paving materialinto the hopper as it tows the paver. The screed assembly of the Layton paver may be heated in the manner shown in U.S. Pat. No. 3,286,606.

SUMMARY or THE iuvsurron The present invention, in its broader aspects, provides paving apparatus comprising a material hopper having a sloping front wall, a rear wall, and opposite sidewalls, the walls respectively having lower extremities which mutually define a material discharge opening. Gate means are provided connected to the hopper for selectively opening and closing the opening, the gate means including a center section and at least one side section at each side of the center section thereby to provide openings of varying widths. Means is provided for selectively moving the center section alone between open and closed positions, and for moving the side sections between open and closed positions simultaneously'with movement of the center section. Means is provided mountedon the hopper for supporting the apparatus upon a supporting surface for movement thereover in forward and rearward directions, and a screed assembly is provided adjustably mounted on'the rear wall and extending rearwardly therefrom. Means are provided extending forwardly from the hopper for selectively engaging a part of a vehicle thereby to tow theapparatus, and foot-actuated means are provided for actuating the engaging means between an upper engaging positionand a lower disengaged position. Means are provided for heating both the front wall of It is an object of the present invention to provide improved paving apparatus.

Another object of the invention is to provide improved paving apparatus of the towed type.

The above-mentioned and other features and objects of this invention and the manner of attaining them will become more apparent and the invention itself willbe best understood by reference to the following description of an embodiment of the invention taken in conjunction with the accompanying drawings, wherein:

BRIEF" DESCRIPTION or This onawmos FIG. 1 is a rear view in perspectiveshowing the improved paving apparatus of the invention;

.FIG. 2 is a side view of the paving apparatus of FIG. 1 showing its relationship with a towing dump truck;

FIG. 3 is a fragmentary front'view in perspective further illustrating the towing mechanism of the apparatus;

-cludes FIG. 4 is a fragmentary view in perspective further illustrat ing one of the supporting wheels of the apparatus;

FIG. 5 is a top view of the apparatus;

FIG. 6 is a fragmentary side cross-sectional view showing the gate mechanism of the apparatus;

FIG. 7 is a fragmentary view in perspective further showing the gate mechanism;

FIG. 8 is a fragmentary side cross-sectional view showing the gate and lifting mechanism of the invention;

FIG. MS a schematic view showing the front wall and screed heating system of the apparatus; and

FIG. 10 is a fragmentary cross-sectional view taken along the line l0l0 of FIG. 5.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the FIGS. of the drawings, the improved paving apparatus of the invention, generally shown at 12, in-

a material-receiving hopper 14 comprising a downwardly and rearwardly inclined front wall 16, a generally vertical rear wall 18, and

opposite sidewalls

20 and 22 respectively having upwardly extending extensions or

wings

24 and 26 pivotally connected thereto, as by

hinges

28 and 30, for movement between closed positions, as shown in FIG. 1, and outwardly inclined positions, as shown in FIG. 5.

As best seen in FIGS. 6 and 10, front wall 16 comprises a sloping top plate 32, a bottom plate 34, a rear end plate 36 joining the rear extremities of the top and bottom plates, the top, bottom, rear and front plates mutually defining a heating chamber 40, as will be hereinafter more fully described (FIG. 9). A generally horizontal plate 42 extends forwardly from the forward extremity of the top plate 32,, being disposed between inclined forwardly extending

plates

44 and 46. Lifting lugs 48 extend upwardly from the

extension plates

44, 46 to permit bodily lifting the entire paver for over-the-road transport.

The lower extremities of the top plate 32 of the front wall 16, the

sidewalls

20 and 22, and rear wall -18 mutually define an elongated material discharge opening 50 (FIG. 6). A center gate 52, and

side gates

54 and 56 on one side thereof, and

side gates

58, 60 on the other side are provided respectively pivotally connected to the lower extremity of the rear wall 18 by suitable hinges 63, and serve selectively to open and close the discharge opening 50, as best seen in FIG. 6. In a physical, embodiment of the apparatus in which the hopper 14 is 8 feet wide between the

sidewalls

20 and 22, the center gate 52 is 4 feet long, and each of the

side gates

54, 56, 58 and 60 is one foot long, thus selectively providing paving widths of 4 feet, 5 feet, 6 feet, 7 feet or 8 feet, an additional width of 2 feet on each side being provided by the adjustable screed extensions to be hereinafter described.

The

side gates

54, 56, 58 and 60 are selectively raised and lowered by means of suitable chains 62 which. may be selectively engaged with suitable hooks 64 attached to the rear wall 18 adjacent its upper extremity 66, thereby to hold the side gates in their closed positions. Center gate 52 is raised and lowered by'means of a suitable chain 68 having a hook 70 at its upper end for attachment over the tail gate 72 of the bed of a towing dump truck 74, as will hereinafter be more fully described.

Side gate 54 has a plate 75 secured to its upper surface and overlaying the upper surface of center gate 52, side gate 56 has a similar plate 76 overlaying side gate 54, and

side gates

58 and 60 have

similar plates

78 and 80 respectively overlaying center gate 52 and side gate 58. It will now be seen that the

side gates

54 and 58, by reason of the plates 75 and 78, can not be lowered ,to their open positions unless center gate 52 is lowered to its open position, and likewise that the

outer side gates

56 and 60 can not belowered to their open positions unless the center gate 52 is lowered to its open position, and likewise that the

outer side gates

56 and 60 can not be lowered to their open positions unless the center gate 52 and the inner dashed lines in FIG. 6, to its upper closed position, as shown in solid lines, will result in simultaneous closing of any of the side gates which are opened by reason of the

plate members

75, 76, 78 and 80.

In operation, hook 70 on the chain 68 attached to the center gate 52 is placed over the upper extremity of the tailgate 72 of the dump truck 74. It will readily be seen by reference to FIG. 2 that lowering of the dump bed 82 in the direction shown by the arrow 84 will result in upward movement of the upper extremity of the tailgate 72, as shown by the arrow 86, thus resulting in upward movement of the chain 68, as shown by the arrow 88, thereby closing the center gate 52 together with any of the side gates which may be open. It will be understood that lowering of the dump bed 82 will simultaneously close the tailgate 72 to prevent material from being discharged from the truck body into the hopper. When it is desired to lay paving material, the dump bed 82 is raised thus lowering the upper extremity of the tailgate which permits the center gate 52 to open, the tailgate 72 also opening so that material is discharged into the hopper 14 as shown by the arrows 90. If it is desired to lay a width of paving only as wide as the length of the center gate 52, the chains 62 respectively attached to the side gates are left engaged with their respective hooks 64. However, if it is desired to lay a wider width of paving, the chains 62 of the desired number of side gates are disengaged from their respective hooks 64 and thus, the respective side gates will open simultaneously with opening of the center gate 52. With this arrangement, the need for the blockoff plates of the Layton paver is eliminated since the gates of the present invention can be opened and closed at will by lowering or raising the truck bed a small amount. The gate system of the invention also eliminates the need to empty the paver at the end of a particular spread since, as described, lowering of the truck bed automatically and simultaneously closes all of the gates so that any remaining mix in the hopper can be carried a short distance therein for spreading elsewhere.

A screed assembly 92 is provided comprising a rearwardly extending compacting portion 94 and an upwardly extending mounting portion 96 pivotally mounted on extension members 98 and 100 which extend rearwardly from the hopper, as at 102 and 104. The compacting portion 94 includes a bottom plate 104 having sufi'tcient flexibility to permit deflection upwardly or downwardly to provide a crown or valley in the paving, as will be described shortly. Mounting portion 96 comprises two laterally spaced apart

plates

106 and 108 each secured to the bottom plate 104 and adjustably connected by a turnbuckle 110. It will be readily understood that adjustment of the turnbuckle 110 in one direction will draw the upper ends 112, 114 of the

plates

106, 108 more closely together thereby deflecting the center portion of the bottom plate 104 downwardly, as shown by the arrow 116, so as to form a valley in the paving 118, whereas adjustment of the turnbuckle in the opposite direction will separate the upper ends 112, 114 of the

plates

106, 108 thereby deflecting the center portion of the bottom plate 104 upwardly, as shown by the arrows 120 so as to form a crown in the paving. A plate 122 is attached to mounting plate 108, but not to mounting plate 106, and thus moves with the mounting plate 108 in response to adjustment of the turnbuckle 110. An indicating pointer 124 on the plate 122 cooperating with indicia on rear wall 18 indicates the amount of crown or valley deflection of the bottom plate 104.

The angle of attack of the bottom plate 104 of the screed assembly 92, which determines the thickness of the paving layer 118, is adjusted by means of

suitable jacks

126, 128 interconnecting the outer ends 130 and 132 of the compacting portion 94 and the outer ends of the members 98 and 100, as shown. The

jacks

126, 128 are independently manually operated by

suitable cranks

134, 136,,thus permitting tilting or cocking of the entire screed assembly as dictated by the paving needs. The angle of attack of each end 130, 132 of this screed assembly is indicated by a suitable pointer 138 (only one of which is shown in FIG. 1) having one end secured to the upper distal end thus indicating the angle of attack on a scale 140 on the respective member 98, 100.

Screed extensions

142, 144 are provided on each side of the paver, each comprising a strilteoflplate 146 and an extension plate 148. Each of the

screed assemblies

142, 144 is adjustably mounted for lateral inward and outward movement, as shown by the arrows 150, by means of

suitable members

152, 154 journaled in suitable bearing tubes 157, 158 mounted on the respective mounting

plate

106, 108. Selective adjustment of the

screed extensions

142, 144 is provided by means of members 160 attached to the respective strikeoff plate 146, and moving herewith, and respectively having a roller chain 162 secured thereto. Each of the chains 162 is engaged by a sprocket 164 mounted on a suitable shaft 166 and manually operated by a suitable crank 168.

As best seen in FIG. 6, each of the

sidewalls

20, 22 has a eutout portion 170 formed therein communicating with the interior of the hopper thus permitting the material in the hopper to spill outwardly therethrough when the

screed extensions

142, 144 are extended. The openings defined by these cutout portions 170 are closed by the strikeofi plates 146 when the screed extensions are in their innermost positions, thus preventing the flow of material through these openings.

The paver is supported for forward and rearward movement over the ground 172 by means of a pair of

wide wheels

174, 176. Each of the

wheels

174, 176 is mounted beneath the forward end 178 of the hopper by means of a pair of downwardly extending

brackets

180, 182. Each of the wheels is rotatably mounted between the pair of brackets 1 80, 182 by means of a suitable bearing pin (not shown) selectively positioned in one or the other of two

openings

184, 186, as best seen in FIG. 4. Thus, each of the

wheels

174, 176 may be selectively positioned at two different distances beneath the hopper. This arrangement, in turn, permits independent adjustment of the height of the screed assembly above the ground, separate and apart from the angle of attack adjustment provided by the

jacks

126, 128. Thus, when both of the

wheels

174, 176 are rotatably attached to the

brackets

180, 182 by means of the lower openings 184, the screed assembly has a generally lower position with respect to the ground. On the other hand, when both of the wheels are attached by means of the upper opening, 186, the screed assembly is at a higher elevation, thus permitting the application of a much thicker paving layer, or the laying of crushed rock. Further, mounting of one of the wheels by means of the lower openings 184 and the other by means of the upper openings 186 provides a much greater tilting or cocking of the screed assembly than is available through adjustment of the

jacks

126, 128, thus permitting paving of one side of a highly crowned roads where it is desired to provide a thick layer of paving adjacent the outer edge and a thin layer adjacent the crown at the center.

Mud and dirt are removed from

wheels

174, 176 by means of

suitable scrapers

188, 190 pivotally mounted on the

brackets

180, 182 and biased into scraping engagement with the surface of the respective wheel by means of

levers

192, 194 connected by a suitable spring 196.

The paver is towed by means of the vehicle-engaging apparatus 198, as best seen in FIGS. 2 and 3. A pair of

anns

200, 202 are provided each having a hook portion 204 at its distal end for selectively engaging the axle 206 of the rear wheels 208 of the truck 74.

Arms

200, 202 are adjustably received within

tubes

210, 212 thereby to accommodate the paver to different types of trucks.

Tubes

210, 212 are respectivelyattached to

tubes

214, 215 which are journaled in bearing

members

216, 218 and 220 mounted below the forward end 178 of the hopper.

Anns

200, 202 are thus independently mounted for pivotal movement between their lower disengaged and upper axle-engaging positions. An inner rod 221 extends through the

tubes

214, 215 respectively extending beyond the opposite ends thereof. Torsion springs 222, 224 respectively connect the outer ends of the

tubes

214, 215 and the outer ends of the rod 221, springs 222 and 224 thus biasing

arms

200 and 202 upwardly toward extremity of the respective mounting

plate

106, 108 and its 75 their axle-engaging position.

transport of thepaver overthe highway.

' sidewall 20, and baffle 248 and sidewall 22,

The

arms

200, 202 are selectively moved between their lower and upper positions by means of a foot-actuated lever member 226 positioned over the compacting portion 94 of the screed assembly 92and pivotally mounted on member 100, as at 228.'The footactuated lever member 226 is connected to lever member 230 on rod 221 by means of a link 232. Lever member 226 is held in its downward position by a suitable latch 234 pivotally mounted on'member 100. It will now be seen that downward movement of the foot-actuated lever member 226 will tend to tighten the torsion springs 222, 224, thus causing the

arms

200, 202 to independently pivot upwardly to their axle engaging position. This twin torsion bar arrangement makes it possible for one man to raise or lower the axle-engaging assembly 198 without difficulty. The independent pivotal mounting with the accompanying spring biasing of

twoarms

200, 202 accommodates up and down motion of the towing truck and tilting of the truck axle so that the paver will not drift on side hills oraround short turns.

Suitable rollers 234 are rotatably mounted on the front end 178 of the hopper for engaging the truck wheels 208 thereby permitting the truck to back the 'paver, as required.

Referring particularly. iOFlGS. 2 and 8, the center gate lifting chain 68 passes through a bracket' 236 on the rearwall 18, chain 68 having an extra link or other. abutment 238 thereon. Thus, when the truck bed 82 has been lowered a suflicient distance to close the center gate 52 as above-described,

further lowering of the truck bed with concurrent lifting ofthe chain 68 inthe direction 88 will cause the abutment 238 to engage the bracket 236, thus resultingin pivoting of the entire paver'about the

wheels

174, 176 so as to raise the entire screed assembly 92 above the ground. Thus, automatic raising of the assembly occurs immediately following the closing of the shutotT gates by lowering of the dump. truck bed, the rear or screed end of the paver thus being automatically raised at the sametime so as to permit the truck operator to maneuver the paver without completely picking it up. This arrangement completely eliminates the hydraulic jacks and chain hoist previously required to raise the screed assembly.

It will be seen that the sidewall extensions or

wings

24, 26 are retained in their outward positions by suitable chains and 27, the outward inclination of the wings being adjustable by means of suitable hooks on every wall. These wings thus allow unloading of trucks of different widths, while both the wings and the screed extensions can be withdrawn to permit Referring'now particularly to FIG. 9, the chamber within the front wall 16 of the hopper is longitudinally divided into two

sections

242, 244. Each of theseheating chamber. sections is further transversely divided by

baffles

246, 248 into forward and

rear portions

250, 252 and 254, 256. It will be seen that each of the

baffles

246, 248 extends inwardly from the

respective sidewall

20, 22 toward the center partition 240, being spaced therefrom to provide

openings

258, 260 respectively communicating between the forward and rear chamber portions.

Openings

262, 264 are respectively formed in the bottom plate 34 adjacent the

sidewalls

20, 22 and the front wall 38.

Angled plates 2 66, 268 extend between bafl'le 246 and and receive and direct

suitable burners

270, 272 toward the rear wall 36, as shown.

Burners

270, 272 are respectively connected to a tank 274 of suitable fuel, such as liquid propane, by

lines

276, 278. It will be seen that the heated products of combustion from the

burners

270, 272 travel initially toward the rear wall 36, then inwardly toward the partition 240, forwardly through the

openings

258, 260, outwardly toward the

sidewalls

20, 22 and the finally exhausted through the

openings

262, 264, thus efficiently heating the entire surface area of the top plate 32 of the front wall 16 of the hopper. By so heating the front wall of the hopper, it is possible to handle either hot or cold mixed asphalt directly from an asphalt plant or directly from a stockpile. ln the case of the use of cold mix asphalt, heating the front wall allows the mix to slide more easily down the front wall and smoothly through the discharge opening. Heating the front wall also facilitates the use of hot mix during cold weather.

Still referring to FIG. 9 in contention with FIG. 1, the compacting portion 94 of the screed assembly includes

top walls

280, 282 spaced from the bottom wall 104, end

walls

282, 286,

back walls

288, 290, and

inner walls

292, 294 which mutually define with the

plates

106, 108, two

heating chamber sections

296, 298.

Baffles

300, 302 extend outwardly from the

inner walls

292, 294 toward the

end walls

284, 286 to subdivide the

chamber sections

296, 298 respectively into forward and

rear portions

304, 306 and 308, 310. The outer ends of the

baffles

300, 302 are spaced from the

end walls

284, 286, respectively, and in turn have forwardly and rearwardly

inclined bafiles

312, 314 extending therefrom to defined

passageways

316, 318 communicating between the forward and

rear chamber portions

304, 306 and 308, 310, respectively. Y

Burners

320, 322 extend through the

inner walls

292, 294 intothe

forward chamber portions

304, 308 and the products of combustion thus respectively travel outwardly toward the

end walls

284, 286, rearwardly through the

passageways

316, 318, and then inwardly through the

chamber portions

306, 310, being finally discharged through openings 324, 326 in the

backwalls

288, 290, as shown.

Burners

320, 322 are also connected to the fuel tank 274 removably mounted on the rear wall 18 of the hopper by means of brackets 328 and coil spring loop 330. It is thus seen that the bottom-compacting plate 104 of the screed is uniformly heated throughout its surface area, thus providing efficient smoothing of the paving material 118. Ready access to the burners 320, 322is-p'rovided by a removable cover plate 332. It is-also seen that the

front wall burners

270, 272 project through openings 334 in the

sidewalls

20, 22, and that ready access thereto is thus provided.

Expanded

metal catwalks

336, 338 are hingedly connected to the

top walls

280, 282, as by hinges 340 to provide more secure footing for the operator standing upon the compacting portion 94 of the screed assembly.

While there have been described above the principles of this invention in connection with specific apparatus, it is to be clearly understood that this description is made only by way of example and not as a limitation to the scope of the invention.

I claim:

1. Paving apparatus comprising: a materialv hopper having an inclined load-supporting wall and sidewalls, said. walls respectively having lower extremities mutually defining a material discharge opening; gate means connected to said hopper for selectively opening and closing .said opening including a plurality of side-by-side sections thereby to provide openings of various widths; first means for selectively moving one section alone between open and closed positions; second means for moving a plurality of adjacent sections between open and closed positions simultaneously between their open and closed positions; and a screed adjustably mounted on said rear wall and extending rearwardly therefrom, said first moving means comprising an elongated relatively flexible lifting member having one end attached to said one of said gate sections, said second moving means comprising a member connected to one of said gate sections in a manner to engage the adjacent sections when said one section is being moved into said closed position whereby movement of said one section into its closed position simultaneously moves the adjacent sections into their closed positions.

2. The apparatus of claim 1 further comprising at least one other elongated relatively flexible member having one end attached to a respective gate section, and means on said hopper for selectively engaging said flexible members thereby to hold said gate sections in said closed position thereof.

3. The apparatus of claim 1 wherein one of said walls is a rear wall, and further comprising a pair of wheels coaxially mounted adjacent the forward portion of said hopper, said screed normally supporting a substantial portion of the weight of said apparatus and the contents of said hopper, and further comprising means on said rear wall cooperatively engaging an abutment on said lifting member in said closed position of said one gate section plate member whereby further movement of said lifting member results in pivoting of said apparatus about said wheels thereby elevating said screed above said supporting surface.

4. Paving apparatus comprising: a material hopper having an inclined load-supporting wall and sidewalls, said walls respectively having lower extremities mutually defining a material discharge opening; means for heating said load-supporting wall; gate means connected to said hopper for selectivelyopening and closing said opening; a screed adjustably mounted on said rear wall and extending rearwardly therefrom; said load-supporting wall including a heating chamber therein, said heating means being positioned in said chamber, said heating means comprising at least one fluid fuel-burning nozzle positioned in said chamber; means for dividing said chamber into a plurality of sections, there being one of said nozzles respectively positioned in each of said chamber sections, each of said chamber sections having a baffle therein further dividing each of said chamber sections into lower and upper portions, the respective nozzle being positioned in a lower chamber portion and being remotely located from said dividing means, each of said upper chamber portions having at least one opening therein remotely located from said dividing means for exhausting combustion gases therefrom.

S; The apparatus of claim 4 wherein a wall joins said loadsupporting wall to form a rear boundary of said chamber and the front boundary of said discharge opening, each of said nozzles being directed toward the interior surface of said wall.

6. Paving apparatus comprising: a material hopper having an inclined load-supporting wall and sidewalls, said walls respectively having lower extremities mutually defining a material discharge opening; means for heating said load-supporting wall; gate means connected to' said hopper for selectively opening and closing said opening including a plurality of side-by-side sections thereby to provide openings of various widths; first means for selectively moving one section alone between open and closed positions; second means for simultaneously moving a plurality of selected adjacent sections between their open and closed positions; a screed adjustably mounted on said hopper and extending rearwardly therefrom; means extending forwardly fromsaid hopper for selectively engaging a part of a conventional vehicle thereby to move said apparatus both in a forward and rearward direction; means for actuating said engaging means between an upper engaging position and a lower disengaged position, said actuating means including means for biasing said engaging means toward said upper engaging position; a bottom wall spaced below said load-supporting wall, and back and forward walls joining said other wall to said front wall and defining therewith and with the sidewalls of said hopper a first heating chamber, first means for dividing said first chamber into sections, second means for dividing each of said first chamber sections into upper and lower portions, said second means providing a connection between said portions, said load-supporting wall heating means comprising a fluid fuel-burning nozzle positioned in the lower portion of each of said first chamber sections remote from the connection between the respective portions, said bottom wall having openings therein respectively communicating with the upper portion of each of said first chamber sections remote from the connection between the respective portions for exhausting combustion gases therefrom whereby the combustion gases from each of said nozzles traverse both portions of the respective first chamber section; each of said gate means sections comprising a plate member mounted on one of said walls for pivotal movement between an upper closed position and a lower open position; said screed including a bottom material-compacting wall, a top wall spaced from said bottom wall, and respectively spaced back and forward walls and end walls mutually defining a second heating chamber, third means for dividing said second chamber into sections, fourth means for dividin each of said second chamber sections into portions whic communicate ad acent one of said third dividing means and the respective end wall, a fluid-burning nozzle positioned in one portion of each of said second chamber sections remote from the communication between the respective portions, one of said forward and backwalls of said screed having openings therein respectively communicating with the other portion of each of said second chamber sections remote from the communication between the respective portions for exhausting combustion gases therefrom whereby the combustion gases from each of said last-named nozzles traverses both portions of the respective second chamber section, and a fluid fuel tank mounted on the rear surface of said backwall and coupled to all of said nozzles for supplying fuel thereto.

@2 3 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3, 557,672 Dated January 26, 1971 Albert L, Shurtz/Fabian J. Leimeister It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

I sPEcIFIeRTIw Column 2, line 28, --and a front plate 38 joining the forwa:

extremities of the top and bottom plates, should be inserted after tin comma Column 2, lines 7l-73 delete is lowered to its open pos and likewise that the outer s

ide ga te

56 and 60 can not be lowered to the i: open positions unless the center ga t 52- Column 4, line 8 "157" should be "156-" Column 4, line 12- "herewith" should be -therewith Column 4-, line 42- ing, should be ings" Column 4, line 49- "roads should be -road Column 5, line 67- "the" should be --are-- Signed and sealed this 31st day of August 1971 (SEAL) Attest:

EDWARD M.FLETCHER, JR. WILLIAM E. SCHUXLER, JR. Attesting Officer Commissioner of Patents

Claims

1. Paving apparatus comprising: a material hopper having an inclined load-supporting wall and sidewalls, said walls respectively having lower extremities mutually defining a material discharge opening; gate means connected to said hopper for selectively opening and closing said opening including a plurality of side-by-side sections thereby to provide openings of various widths; first means for selectively moving one section alone between open and closed positions; second means for moving a plurality of adjacent sections between open and closed positions simultaneously between their open and closed positions; and a screed adjustably mounted on said rear wall and extending rearwardly therefrom, said first moving means comprising an elongated relatively flexible lifting member having one end attached to said one of said gate sections, said second moving means comprising a member connected to one of said gate sections in a manner to engage the adjacent sections when said one section is being moved into said closed position whereby movement of said one section into its closed position simultaneously moves the adjacent sections into their closed positions.

4. Paving apparatus comprising: a material hopper having an inclined load-supporting wall and sidewalls, said walls respectively having lower extremities mutually defining a material discharge opening; means for heating said load-supporting wall; gate means connected to said hopper for selectively opening and closing said opening; a screed adjustably mounted on said rear wall and extending rearwardly therefrom; said load-supporting wall including a heating chamber therein, said heating means being positioned in said chamber, said heating means comprising at least one fluid fuel-burning nozzle positioned in said chamber; means for dividing said chamber into a plurality of sections, there being one of said nozzles respectively positioned in each Of said chamber sections, each of said chamber sections having a baffle therein further dividing each of said chamber sections into lower and upper portions, the respective nozzle being positioned in a lower chamber portion and being remotely located from said dividing means, each of said upper chamber portions having at least one opening therein remotely located from said dividing means for exhausting combustion gases therefrom.

5. The apparatus of claim 4 wherein a wall joins said load-supporting wall to form a rear boundary of said chamber and the front boundary of said discharge opening, each of said nozzles being directed toward the interior surface of said wall.

6. Paving apparatus comprising: a material hopper having an inclined load-supporting wall and sidewalls, said walls respectively having lower extremities mutually defining a material discharge opening; means for heating said load-supporting wall; gate means connected to said hopper for selectively opening and closing said opening including a plurality of side-by-side sections thereby to provide openings of various widths; first means for selectively moving one section alone between open and closed positions; second means for simultaneously moving a plurality of selected adjacent sections between their open and closed positions; a screed adjustably mounted on said hopper and extending rearwardly therefrom; means extending forwardly from said hopper for selectively engaging a part of a conventional vehicle thereby to move said apparatus both in a forward and rearward direction; means for actuating said engaging means between an upper engaging position and a lower disengaged position, said actuating means including means for biasing said engaging means toward said upper engaging position; a bottom wall spaced below said load-supporting wall, and back and forward walls joining said other wall to said front wall and defining therewith and with the sidewalls of said hopper a first heating chamber, first means for dividing said first chamber into sections, second means for dividing each of said first chamber sections into upper and lower portions, said second means providing a connection between said portions, said load-supporting wall heating means comprising a fluid fuel-burning nozzle positioned in the lower portion of each of said first chamber sections remote from the connection between the respective portions, said bottom wall having openings therein respectively communicating with the upper portion of each of said first chamber sections remote from the connection between the respective portions for exhausting combustion gases therefrom whereby the combustion gases from each of said nozzles traverse both portions of the respective first chamber section; each of said gate means sections comprising a plate member mounted on one of said walls for pivotal movement between an upper closed position and a lower open position; said screed including a bottom material-compacting wall, a top wall spaced from said bottom wall, and respectively spaced back and forward walls and end walls mutually defining a second heating chamber, third means for dividing said second chamber into sections, fourth means for dividing each of said second chamber sections into portions which communicate adjacent one of said third dividing means and the respective end wall, a fluid-burning nozzle positioned in one portion of each of said second chamber sections remote from the communication between the respective portions, one of said forward and backwalls of said screed having openings therein respectively communicating with the other portion of each of said second chamber sections remote from the communication between the respective portions for exhausting combustion gases therefrom whereby the combustion gases from each of said last-named nozzles traverses both portions of the respective second chamber section, and a fluid fuel tank mounted on the rear surface of said backwall and coupled to all of said nozzles for supplying fuel thereto.