US3246584A

US3246584A - Paving machine

Info

Publication number: US3246584A
Application number: US225257A
Authority: US
Inventors: Billy R Lee
Original assignee: Individual
Current assignee: Individual
Priority date: 1962-09-21
Filing date: 1962-09-21
Publication date: 1966-04-19
Anticipated expiration: 1983-04-19

Description

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OP mmw NW B. R. LEE

PAVING MACHINE pril 19 1966 Filed Sept.

B. R. LEE

PAVING MACHINE A rin 19', 1966 5 Sheets-Sheet 2 Filed Sept. 21, 1962 3 3 z 90 HO I06 I 34 INVENTOR. BILLY R. LEE- BY ntmi k gk ATTORNEYS B. R. LEE

PAVING MACHINE April 19, 1966 5 Sheets-Sheet 3 Filed Sept. 21, 1962 7 WIIIIIIIIIIIIIIIIIIIIA ME W United States Patent O 3,246,584 PAVING MACHINE Billy R. Lee, Rte. 6, Box 608 C3, Charlotte, N.C.

Filed Sept. 21,1962, Ser. No. 225,257 r 9 Claims. (Cl. 94-46) The present invention relates to paving machines and more particularly to paving machines of the type adapted to be drawn behind a truck containing the paving material, which paving material is unloaded from the truck into the pavingmachine to be spread, smoothed and compacted onto the surface to be paved.

Conventional paving machines for depositing a layer of paving material on a surface to be paved, such as driveways, parking lots, etc., and more particularly those paving machines fordepositing asphaltic paving materials are usually oftwotypes. One type of conventional paving machine is a very large, heavy,.self propelled machine whichhas a large capacity hopper for containing the paving. material and for. depositing the paving material on the surface to be paved. This type paving machine utilizes a screedfor spreading, smoothing and compacting the paving material on the surface and includes suitable burners for heating the working surface of the screed to a temperature at least as high as the temperature of the paving material to prevent the paving material from adhering thereto.

Itcan readily be appreciated that these self propelled machines are extremely complicated in construction and therefore, quite expensive to manufacture and to maintain. Also, these machines are difficult to. operate because, among other things, the .burners for heating thescreed radiate a considerable amountof heat which has a very fatiguing effect upon the operators of the machine.-

Still further,.these self propelled machines require considerable time to be prepared for spreading the paving material since the burners must be, fired and the screed heatedto operating temperature before the machine may be utilized productively. Also,.when the paving operation is interrupted for various and sundry reasons, the burners mustre-main inoperation to keep the screed at operating temperature or the, same mustbe refired and' the screed again brought up to operating temperature before the paving operation may be resumed.

The second type of conventional paving machines are normally drawn behind a truck .which. contains the paving material and thereby obviates the necessity of self propelling means and a large capacity hopper which contributes to the excessive weight and complicated nature of the aforementioned self propelled machines. However, some of this second type of conventional machines have retained the burners for heating thescreed to prevent sticking of 'the paving material thereto.

Therefore, the aforementioned deficiencies inherent in a paving machine utilizing the burners for heating a screed are still present in these machines.

Other conventional truck-drawn paving machines have dispensed with the burners for heating the screed, but the paving material quite frequently sticks to the working surface of the screed which resultsin a very'rough surface on the thusly deposited paving material.

Another deficiency encountered in the operation of conventional paving machines of both types is the difficultyencountered in laying contiguous strips of paving material to form a composite paved surface. Because of this difficulty, some of the conventional paving machines are unable to form strips of paving material in contiguous relation without a space or joint'therebetween which is usually manually filled with paving material since the weight thereof prohibits the machine from being supported by the previously formed strip of paving material.

While other conventional paving machines are capable .of forming paving strips in contiguous relation, the adjacent portion of the previously formed strip is unduly compacted by the paving machine during formation of thecontiguousstrip of paving material since the machine is supported only on a small area of the previously formed strip.

It is therefore an object of the present invention to provide an improved paving machine of simplified construction which obviates the aforementioned difficulties encountered in the operation of conventional paving machines and wherein sticking of the paving material on the working surface of the screed is prevented without the necessity of burners for heating the screed.

Still another object of the present invention is to sticking thereto to thereby facilitate the screedis spread.

ing, smoothing, and compaction of the paving material.

A'more specific object of the present invention is to provide an improved paving machine of .the character described including novel mounting means for the screed whereby opposite ends of the screed are independently, vertically adjustableand wherein the central portion of the screed may be bowed upwardly or downwardly in a minimum amount of time to form strips of paving material having various cross-sectional configurations.

A further object of the present invention is to provide an improved paving machine of simplified construction of the character described including means for partially compacting the paving material before it reaches the screed and wherein the screed then spreads the partially compacted paving material over the surface to be paved to a predetermined thickness and smooths and further compacts the same.

Some of the objects of the invention having been stated, other objects will appear as the description proceeds, when taken in connection with the accompanying drawings, in which:

FIGURE 1 is a top plan view of the paving machine of the present invent-ion;

FIGURE 2 is a rear elevational view of the machine shown in FIGURE 1 with portions broken away for clarity and with some parts shown in a different operational position;

FIGURE 3 is an end elevational view of the apparatus shown in FIGURE 1;

FIGURE 4 is a vertical transverse section taken substantially along line 44 in FIGURE *1;

FIGURE 5 is an isometric detail looking in the direction of the arrow 5 in. FIGURE 4 with portions broken away for clarity;

FIGURE 6 is an enlarged fragmentary vertical section taken substantially along line '6.-6 in FIGURE 3;

FIGURE 7 is an enlarged transverse vertical section taken substantially along line 77in FIGURE 2;

FIGURE 8 is an enlarged fragmentary isometric View looking in the direction of the arrow 8 in FIGURE 1; and

FIGURES 9-11 are sectional views of various types of paving strips which may be formed by the paving machine of the present invention.

Referring now to the drawings, and more particularly to FIGURE 1, the paving machine of the present invention is generally indicated at 20 and comprises a hopper 21 defined by a pair of generally

rectangular side members

22, 23 joined together at their forward portion by a channel member 24 and rearwardly therefrom by a rear wall 25 extending downwardly and tfor-wardly at an acute angle to the vertical (FIGURE 4). The web portion of channel member 24 is preferably disposed at a rearwardly and downwardly extending acute angle to the vertical. Rear wall 25 preferably extends upwardly beyond the upper edge of

side members

22, 23 to aid in preventing paving material from falling rearwardly out of hopper 21 and behind rear wall 25 and terminates in a lower edge spaced upwardly from the lower edges of

side members

22, 23 to define a paving material discharge opening in the bottom of hopper 21.

Hopper 21 is supported for movement over the surface to be paved by a pair of skids 26, 27 (FIGURE 2) preferably formed of suitable angle material and having one leg thereof disposed vertically and mounted on the outer surface of

side members

22, 23 with the horizontal legs thereof disposed at the same elevation as the lower edges of

side members

22, 23. The forward portions of

skids

26, 27 are preferably curved upwardly (FIGURE 3), as is the forward portions of the lower edges of

side members

22, 23 to facilitate movement of paving machine 20 over the surface to be paved.

It is noted that the lower portions of

side members

22, 23 serve as means to confine the paving material being discharged from hopper 2=1 therebetween and to prevent spreading thereof outwardly from the machine 20. It is further noted that the forwardly and downwardly angled position of rear wall 25 permits some of the weight of the paving material disposed within hopper 21 to be utilized to hold machine 20 downwardly in contact with the surface to be paved.

A pair of chains 28, 29 (FIGURE 1) are connected at one end to channel member 24 at spaced points and are adapted to be connected at their other ends to a prime mover, such as a truck or the like, for drawing paving machine 20 over the surface to be paved. A pair of

braces

30, 31 are connected at one end to channel member 24 closely adjacent to chains 28, 29 and at their other ends to

side members

23, 24 for bracing channel member 24 to prevent the same from being bent forwardly as machine 20 is drawn over the surface to be paved.

An angle member 32 (FIGURE 4) has one leg 32a thereof mounted on the rear surface of the lower portion of rear wall 25 by any suitable means (not shown) with the other leg 32b thereof disposed perpendicular to rear wall 25 and extending rearwardly and downwardly therefrom at an acute angle to the horizontal. Angle member 32 defines means for partially compacting the paving material discharged from hopper 21 beneath the lower edge of rear wall 25.

A screed 33 (FIGURES 1 and 2) is disposed rearwardly of rear wall '25 and angle member 32 and extends for substantially the full distance between

side members

22 and 23. Screed 33 preferably comprises an angle member 34 (FIGURES 4 and 8) having one leg 35 thereof disposed generally horizontally and the other leg 36 thereof extending upwardly from the front edge of horizontal leg 35. The lower portion 36a of leg 36 is disposed substantially vertically, or perpendicular to horizontal leg 35, and the upper portion 36b of leg 36 is bent rearwardly at an acute angle to the vertical.

The central portion of leg 36 of angle member 34 is cut away as indicated at 37 (FIGURES 2 and to form a cutout or space therein. A closure plate 38 is mounted on the rear surface of vertical portion 36a of leg 36 on one side of the cutout 37 and extends thereacross to close the cutout 37 to the passage of paving material therethrough while permitting the portion of leg 36 on the opposite side of cutout 37 to move relative to closure plate 38.

Plates 39 (FIGURE 8) are mounted on the front face of the vertical portion 36a of leg '36 on opposite sides of cutout 37 and extends between the ends of leg '36 and the opposite sides of cutout '37. Plates 39 are of height substantially the same as the height of vertical portion 36a of leg 36 and serve as reinforcing means therefor.

A pair of brace members 40, 41 (FIGURES 2 and 8) are connected along one side edge to the upper surface of horizontal leg 35 and along the other side edge to vertical portion 36a of leg 36. Brace members 40, 41 extend from opposite ends of the angle member 34 to points adjacent to the opposite sides of cutout 37 in leg 36 and serve to reinforce angle member 34. The portion of horizontal leg 35 rearwardly of brace members 40, 41 is reinforced by a plurality of lateral brace members 42 extending between brace members 40, 41 and the rear edge of horizontal leg 35 at spaced points along horizontal leg 35 intermediate the ends of brace members 40, 41 and by longitudinal brace members 43 extending between the lateral brace members 42. It is noted that

brace members

42 and 43 are connected to horizontal leg 35 and to each other by any suitable means, such as welding or the like.

Means generally indicated at 44 (FIGURES 4 and 5) are provided at the central portion of angle member 34 for bowing the same upwardly or downwardly to form paving strips of varying cross-sectional configurations, such as the fiat strip A shown in FIGURE 9, the crowned strip B or strip having a convex upper surface shown in FIGURE 10, and the valley strip C or strip having a concave upper surface shown in FIGURE 11, and comprises a pair of

vertical members

45, 46 mounted at their lower ends on horizontal leg 35 of angle member 34 and at their upper ends on the upper edge of rearwardly angled portion 36b of leg 36 on opposite sides of the cutout 37. A second pair of spaced

vertical members

47, 48 are mounted at their lower ends on the horizontal leg 35 of angle member 34 by any suitable means such as welding and extend upwardly therefrom. Second

vertical members

47, 48 are preferably formed of angle material with one leg thereof disposed parallel to the rear edge of horizontal leg 35 and parallel to the first

vertical members

45, 46.

A pair of adjustment bars 50, 51 are mounted at opposite ends in suitable openings formed in

vertical members

45, 47 and 46, 48, respectively. A bolt 52 is journaled for rotation at one end in an opening formed in bar 51 and has a pair of collars 53, 54 mounted thereon on opposite sides of bar 51. A suitable key 55 is mounted in bolt 52 to maintain collar 53 against movement away from bar 51. The other end of bolt 52 is externally threaded and is matingly received in an internally threaded opening in bar 50 for moving adjustment bars 50 and 51 relative to each other to upwardly or downwardly bow angle member 34.

Mounting blocks 56 (FIGURE 6) are mounted on each end of leg 36 of angle member 34 and have internally threaded openings therein which matingly receive bolts 57 therein. Bolts 57 penetrate through vertically elongate openings 58, 59 in

side members

22, 23, respectively and terminate in portions 60 which define bearing blocks. Bearing blocks 60 have a vertically extending opening therein with the walls of the openings being concave. Universal bearings 61 are mounted in the concave walled openings in bearing blocks 60 for rotation about a horizontal axis but are held against rotation about a vertical axis by means (not shown). Bearings 61 have internally threaded openings through the central portion thereof in which are disposed vertically disposed screws 62.

Each of the screws 62 is journaled for rotation at its lower end in a bearing 63 mounted on the horizontal legs on hopper 21 for pivotal movement about a horizontal axisat t-he front portion of the screed. The rear. portion of screed 33 is therefore freely movable upwardly and downwardly about bolts 57 such that the full weight of the rear portion of the screed rests on the paving material discharged from hopper 21. A chain 66 is connected at one endto an angle member 67 mounted adjacent the top of rear wall'25 and at its otherend to the rear portion of screed 33 to limit the downward pivotal movement of the rear portion of screed 33.

A lubricant dispensin'g means 70 (FIGURE 2) is disposed above-screed 33 "and comprises a supply tank 71' rotatably mounted at opposite ends on brackets 72,y73 (FIGURES 3 and 4) by-

bolts

74, 75,"(FIGURE 2), respectively:

Brackets

72, 73 are mounted on and extend rearwardly from

side members

22, 23, respectively. A crank handle 76 (FIGURES 3 and 8) is fixedly mounted on one end of supply tank 71 for facilitating rotation thereof and has a first groove 77 formed in the inner surface thereof at one end and a second groove 78 formed in the inner surface thereof on the opposite side' of tank 71- from first groove 77.- A'latch 80 is mounted on side member 22 and extends rearwardly therefrom. Latch 80 includes a laterally projecting portion 80a which is disposed in the path of travel of crank handle 76 as-the same rotates with supply tank 171' and is engageable with grooves 77, 78to releasably hold crankhandle 76 and hence supply tank 71 in each of two positions.

Supply tank 71 has alongitudinallyextending row of spaced openings 81;preferably of very small diameter, (FIGURES 7 and 8) in one side thereof through which a lubricant L is to be dispensed onto screed 33 therebeneath when tank 71 is in the first of its two positions with openings 81 on'the lower side thereof. Lubricant L is preferably diesel fuel, but may be any suitable lubricant Without departing from the scope of the present invention. It is noted that openings 81 may be varied in diameter to accommodate various types of lubricants without, departing from the present invention.

A valve 82 (FIGURES 2 and 7) ismounted in a suitably threaded opening in the opposite side of supply tank 71 from openings 81. Valve :82 is preferably of the ball check, petcock type and includes avertical opening 83 therethrough. A ball check 84 is disposed in the upper portion of opening 83 and a rotatable core 85 is mounted there-below at a medial portion of jopening 83. Core 85 has an opening 86 therethrough which is adapted to be alined with vertical opening 83 to admit air to the interior of supply tank 71. It is noted that an upward projection 87 is provided below .ball check 84 when valve 82 is in the upwardly extending position from tank 71 to prevent ball check 84 from closing opening 83. Core 85 has. a handle 88 connected thereto by which the same may be rotated to control the amount of air admitted to the interior of supply tank 71 to thus meter the flow of lubricant L. through the openings 81.

Supply tank 71 also has a second internally threaded opening adjacent one end thereof in which is normally disclosed a closure plug 89 (FIGURE.v 2) which is. removable for fillingsupply tank 71 with lubricant.

Skid. extension members 90, 91 (FIGURES 1 and 2) are mounted on

skids

26, 27, respectively, by

hinges

93, 94 for pivotalmovem-ent between a horizontal position and a vertical position. Extension members 90, 91 are suitably reinforced by reinforcing members 95, 96 mounted thereon. When in the down position, skid extension members 90, 91 serve as extensions of'skids 26, 27 to 6 thereby spreadthe weight of paving machine 20 over a much larger portion of the surface supporting the same.

Turn buckles 100, 101 are mounted at one end on brackets 102, 103, respectively, by

bolts

104, 105. Brackets 102, 103 are in turn mounted on

side members

22, 23, respectively. The other ends of turn buckles 100, 101 are connected to brackets 106,107 by bolts 110, 111 and

brackets

106, 107 are in turn mounted on skid extension members 90, 91,'respectively.

A pair of

latches

112, 113 are pivotally mounted on

side members

22, 23, respectively, by bolts 114, 115 and are engageable with skid extension members 90, 91 when the same are in the vertical position to maintain the same in this position when not in use. It is noted that to move skid extension members 90, 91 to the vertical position from the horizontal position, turn buckles 100, 101 are removed by removing

bolts

104, 105 and 110, 111 and members 90,91 are pivoted upwardly to the vertical position and latches 112, 113 are engaged therewith. When the skid extension members90, 91 are moved to the horizontal position, t-urn buckles 100, 101 are reconnected to maintain skid extension members 90, 91 in the horizontal position.

In operation, when paving machine 20 is to be used to form a driveway or other similar strip of paving material, supply tank 71 is filled with a supply of lubricant and is. positioned in ite-second position with openings 81 on the upper side thereof. Screed 33 is then adjusted to the height to form the desired thickness of paving material on the surface to be paved by rotating screws 62 in the appropriate direction by crank members 65 which causes universal bearings 61 and hence, bearing blocks 60, to move upwardly or downwardly and to carry opposite ends of screed 33 therewith. It is noted that if desired, a paving strip may be formed with one side thereof thicker than the other by suitable independent adjustment of opposite ends of screed 33.

Depending upon the desired A, B, or C (FIGURES 9.1l) cross-sectional configuration of the strip to be formed, the central portion of screed 33 is either bowed upwardly or downwardly or positioned at the same elevation as the end portions of screed 33. If a crowned or valley type, B or C (FIGURES 10 and 11) of paving strip is to be formed, bolt'52 is rotated in the appropriate direction to move adjustment bars 50, 51 either toward or away. from each other to bow screed 33 either upwardly or downwardly. If a flat strip A of paving material (FIGURE 9) is to be formed on the surface to be paved, screed 33 is adjusted to be straight throughout its length which will position the horizontal leg 35 of angle member 34 parallel to the surface to be paved throughout its length.

With screed 33 adjusted to the desired height and to the desired elevation configuration -to form the paving strip, paving machine 20 is suitably connected to a truck orthelike which is to draw the same over the surface with hopper 21 disposed beneath the rear end of the truck.

Supply tank 71 is then rotated about its longitudinal horizontal axis to position openings 81 on the lower side thereof by use of crankhandle 76 and held in this position by. the laterally extending portion a of latch member 80 being disposed in groove 78 in crank handle 76.

Valve 82 is adjusted by rotating core by handle 88 to at least partially aline opening 86 with opening 83 to admit air into supply tank 71 to permit lubricant L to flow outwardly through openings 81 and downwardly onto the rearwardly angled portion 36b of leg 36 of angle member 34. The lubricant then flows downwardly along the rearwardly angled portion 36b and onto the forward surface of reinforcing plates 39 and then flows downwardly along the forward surface of the reinforcing plates 39.

Paving material is then dispensed from the rear end of the truck into hopper 21 and the paving material slides downwardly along rear wall 25 as paving machine 20 is drawn over the surface by the truck. The paving material passes beneath the lower edge of rear wall 25 and beneath the lower surface of leg 32b of angle member 32 which partially compacts the same.

The forward surface of reinforcing plates 39 engages the partially compacted paving material and spreads the same over the surface to be paved to the desired thickness. Then, the horizontal leg 35 of angle member 34 moves over the thusly spread paving material smoothing the upper surface thereof and further compacting the paving material. It is noted that the lubricant which has flowed downwardly along the forward surface of reinforcing plates 39 is deposited on the upper surface of the paving material as the same is spread by plates 39 and is spread over the working surface of horizontal leg 35 of angle member 34 as screed 33 moves over the paving material. Lubrication of the working surface of screed 33 prevents the paving material from adhering thereto and thereby facilitates the smoothing and compaction of the paving material. An increased smoothness is thereby imparted to the thusly formed strip of paving material.

If paving machine 20 is to be used to form a paved surface wherein at least two contiguous strips of paving material are to be formed, the first strip is laid in the same manner that machine 20 would be used to lay a driveway or the like. To form the contiguous strip, the skid extension member 90 or 91 on the side of paving machine 20 adjacent the previously formed strip is moved from the vertical position to the horizontal position by releasing the

corresponding latch

112 or 113 and pivoting the skid extension member 90 or 91 downwardly to the horizontal position. With the skid extension member in this position, the

corresponding turn buckle

100 or 101 is connected thereto to maintain the same in the horizontal position. It is noted that the turn buckle may be adjusted to insure that the lower surface of the skid extension member is disposed at the same angle to the horizontal as the upper surface of the previously formed paving strip.

The side of screed 33 adjacent the previously formed strip is then adjusted downwardly by rotation of the screw 62 on this side of the screed to position this end portion of the screed at the same elevation as the upper surface of the previously formed paving strip. The other end portion of screed 33 is then adjusted to the required height above the surface to be paved to form the contiguous paving strip at the desired thickness. The central portion of screed 33 is then adjusted relative to the end portions thereof by means 44 to form the contiguous paving strip with the desired cross-sectional configuration. It is noted that the cross-sectional configuration of the contiguous strips may be varied to form an overall plan for proper drainage or for other various and sundry reasons.

If more than two contiguous strips are to be formed, the same may be formed successively in the manner described above or paving machine 20 may be used to form two separate strips of paving material in spaced relation and then to form a strip of paving material between the previously formed strips and to join the same together without an undesirable ridge or groove. If such a strip is to be formed between previously laid paving strips, screed 33 will be adjusted to position opposite ends thereof as the same elevation as the lower surface of

skids

26, 27 so that the strip to be laid will correspond to the thickness of the previously laid strips. Also, both skid extension members 90, 91 will be moved to the horizontal position to spread the weight of paving machine 20 over a large area of the previously formed strips.

It will therefore be apparent that an improved paving machine of simplified construction is provided wherein paving material is prevented from adhering to the screed to form a paving strip having an upper surface of increased smoothness, and which paving machine is very versatile in that the same may be used to lay paving strips of varying cross-sectional configurations and which may be used to join a contiguous strip to a previously formed strip or strips without the formation of an undesirable ridge or groove because the weight of the machine is spread over an increased portion of the previously laid strip to prevent undue compaction thereof.

In the drawings and specification there has been set forth a preferred embodiment of the invention and, although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitations, the scope of the invention being defined in the claims.

I claim:

1. A paving machine for depositing paving'material onto a surface to be paved, said paving machine comprising (a) a hopper adapted to receive paving material therein and having a discharge opening therein for discharging the paving material onto the surface to be paved,

(b) support means connected to said hopper and adapted to engage the surface to be paved for supporting said hopper above the surface for movement thereover,

(c) a screed mounted on said hopper rearwardly of the discharge opening in said hopper and having a working surface adapted to engage the paving material discharge from said hopper for smoothing and compacting the paving material as said paving machine moves over the surface to be paved,

(d) lubricant dispensing means carried by said hopper and disposed adjacent and operatively associated with said screed for dispensing a lubricant onto the working surface of said screed to facilitate the screeds smoothing and compaction of the paving material, and

(e) metering means connected to said lubricant dispensing means for controlling the dispensation of lubricant onto the working surface of said screed to provide a substantially uniform and predetermined amount of lubricant on the working surface of said screed during the period when the same is desired to be lubricated.

2. The structure set forth in claim 1 wherein said screed includes a horizontal portion for smoothing and compacting the paving material and a generally vertical portion extending upwardly from the forward edge of said horizontal portion for spreading the paving material over the surface to a predetermined thickness, and including (e) means mounting said screed on said hopper for pivotal movement about a horizontal axis disposed at the forward portion of said horizontal portion and with the rearward portion of said horizontal portion being movable upwardly and downwardly about said axis and thereby being adapted to freely engage the paving material discharged from said hopper.

-3. A- paving machine for depositing paving material onto a surface to be paved, said paving machine comprising (a) a hopper adapted to receive paving material therein and having a discharge opening therein for discharging the paving material onto the surface to be paved,

(b) support means connected to said hopper an adapted to engage the surface to be paved for supporting said hopper above the surface for movement thereover,

(c) compacting means connected to said hopper and disposed rearwardly of and adjacent to the discharge opening of said hopper for engaging the paving material discharged therefrom and partially compacting the paving material as the paving machine moves over the surface to be paved,

(d) a screed adjustably mounted on said hopper rearwardly of said compacting means for vertical 9 H adjustment to vary the elevation thereofabove the surface to be paved and adapted to engage the partially compacted paving material for spreading the same over the surface to be paved to a predetermined thickness and for smoothing and further compacting the paving material as said screed moves with said hopper over the surface to be paved, (e) lubricant supply means carried by said hopper and operatively associated with said screed for dispensing a lubricant onto the working surface of said screed to facilitate the screeds smoothing and compaction of the paving material, and (f) metering means connected to said lubricant supply means for controlling the flow of lubricant onto said screed to provide a substantially uniformand predetermined-amount of lubricant on the working surface of the screed during the period when the same. is desired to be lubricated and for terminating the -fiow-of lubricant onto the screed as desired. 4. The structure set forth in claim 3 wherein said screed includes a horizontal portion adapted to smooth and compact the paving material and a generally vertical portion extending upwardly from the forward edge of said horizontal portion, said generally vertical portion including a lower portion substantially perpendicular to said horizontal-portion and an upper portion extending upwardly and rearwardly from said lower portion at an'obtuse angle thereto, said lubricant supply means being disposed above said upper portion of said screed for dispensing the lubricant thereon which flows downwardly onto the forward surface of saidlower portion, and forward movement of said paving machine spreading the lubricant onto the lower surface of said horizontal portion.

5. The structure set forth in claim 4 including adjustment means carried by the central portion of said screed for selectively bowing the central portion of said screed upwardly and downwardly relative to the end portions thereof to selectively form paved surfaces having convex and concave cross-sectional configurations, said adjustment means comprising a pair of side-by-side spaced adjustment bars extending laterally of said screed and being rigidly mounted on said screed above said horizontal portion, rotatable bolt means connecting said adjustment bars and upon rotation thereof serving to selectively move said adjustment bars toward and away from each other.

6. A paving machine for depositing paving material onto a surface to be paved, said paving machine comprismg (a) a hopper adapted to receive paving material therein and having a discharge opening therein for discharging the paving material onto the surface to be paved,

(b) skid means carried by opposite sides of said hopper end engageable with a supporting surface for supporting said hopper above the surface for movement thereover,

(c) skid extension means pivotally mounted on said skid means for movement between horizontal and vertical positions, said skid extension means when in horizontal position defining lateral extensions of said skids and cooperating therewith to define hopper supporting means of increased area to thereby spread the weight of said paving machine over a greater area of the surface supporting the paving machine, and

(d) a screed mounted on said hopper rearwardly of said discharge opening therein for spreading the paving material discharge from said discharge opening over the surface to be paved to a predetermined thickness and for smothing and compacting the paving material as said paving machine moves over the surface to be paved, and

(e) adjustable latch means carried by said hopper it) and engageable with said skid extension means for releasably maintaining said skid extension means in each of saidhorizontal and vertical positions and being adjustable to-vary the angle of said skid extension means to the horizontal to correspond to the slope of the supporting surface.

7. A paving machine for depositing paving material onto the surface to be paved, said paving machine comprising (a) a hopper adapted to receive paving material therein and having-a discharge opening therein for dis! charging the paving materialontothe-surface to be paved,

(b)- skid means. carried by opposite sides of said hopper and engageable witha supporting surface for supporting said hopper above the surface for movement thereover,

(c) skid extension means pivotally mounted. on said skid. means for movement between horizontaland vertical positions, said skid extension meanswhen in horizontal position defining lateral extensions-of said skids and-cooperating therewith to define. hopper supporting means of increased area tothereby spread the weight of said pavingmachineover a greater ,area of the surface supporting the paving machine,

(d) a screed mounted on said hopper rearwardly of said discharge opening therein for spreading the paving material discharged from said discharge openings over the surface to be paved to .a predetermined thickness and for smoothing and compacting the paving material as said paving machine moves over the surface to be paved, and

(e) lubricant dispensing means carried by said hopper andoperatively associated with said screed for dispensingmetered. amounts of a lubricant onto the working surface of said screed to facilitate the screeds smoothing and compaction of the paving material.

8. A paving machine for depositing paving material onto a surface to be paved, said paving machine comprising (a) a hopper adapted to receive paving material therein and having a discharge opening therein for discharging the paving material onto the surface to be paved,

(b) skid means carried by said hopper and adapted to engage the surface to be paved for supporting said hopper above the surface for movement thereover,

(c) a screed vertically adjustably and pivotally mounted on said hopper rearwardly of said discharge opening for spreading the paving material over the surface to be paved to a predetermined thickness, said screed including a horizontal portion for smoothing and compacting the paving material and a vertical portion extending vertically from the forward edge of said horizontal portion and an inclined portion extending upwardly and rearwardy from the upper edge of the vertical portion at an obtuse angle thereto, said screed being mounted for pivotal movement about a horizontal axis adjacent the forward edge of said horizontal portion with the rearward portion of said horizontal portion being movable upwardly and downwardly and being adapted to freely engage the paving material discharged from the hopper and to rest thereon with the full weight of said rearward portion,

((1) horizontally disposed, elongate lubricant supply means mounted on said hopper for rotation about a horizontal axis above the inclined portion of said screed and including a longitudinally extending row of lubricant dispensing openings therein, said supply means being normally positioned with said dispensing openings on the under side thereof for dispensing a lubricant onto the inclined portion of said screed,

which lubricant flows downwardly onto the working surface of said screed to facilitate said screeds smoothing and compaction of the paving material, said supply means being rotatable to a second position wherein said dispensing openings are disposed on the upper side thereof to terminate the flow of lubricant onto said screed,

(e) latch means carried by said hopper for releasably maintaining said supply means in each of said positions, and

(f) valve means carried by said lubricant supply means for metering the flow of lubricant through said dispensing openings.

9. A paving machine for depositing paving material onto a surface to be paved and for spreading the same over the surface, said paving machine comprising (a) a hopper adapted to receive paving material therein and having a discharge opening for discharging the paving material onto the surface to be paved,

(c) compacting means mounted on said hopper rearwardly of and adjacent to the discharge opening of said hopper and adapted to engage the paving material being discharged therefrom for partially compacting the paving material as the paving machine moves over the surface,

(d) a screed adjustably mounted on said hopper rearwardly of said compacting means for vertical adjustment to vary the elevation above the surface to be paved and being adapted to engage the partially compacted paving material for spreading the same over the surface to be paved to a predetermined thickness and for smoothing and further compacting the paving material as such screed moves with said hopper over the surface,

(e) an elongate, horizontally disposed lubricant supply tank rotatably mounted on said hopper above said screed for rotation about a horizontal axis and having a longitudinally extending row of spaced-apart lubricant dispensing openings in one side thereof which is normally the under side of said tank, said supply tank being rotatable about its axis to position said row of openings on the upper side of said tank to terminate the flow of lubricant onto said screed, and

(f) valve means mounted on said tank for varying the admission of air to the interior of said tank for metering the flow of lubricant through said openings onto said screed for providing a ubstantially uniform predetermined amount of lubricant on said screed during the period when the same is desired to be lubricated.

References Cited by the Examiner UNITED STATES PATENTS 2,586,396 2/1952 Trampler 9446 X 2,737,094 3/ 1956 Jackson 9448 2,762,276 9/1956 Mauch 9444 2,842,036 7/1958 Overman 9446 2,909,970 10/1959 Jackson 9448 2,950,660 8/1960 Standfuss 9446 2,951,426 9/1960 Pollitz 9446 2,953,977 9/1960 Warren 9446 X 3,026,780 3/1962 Stein 9446 X CHARLES E. OCONNELL, Primary Examiner.

HENRY C. SUTHERLAND, Examiner.

Claims

9. A PAVING MACHINE FOR DEPOSITING PAVING MATERIAL ONTO A SURFACE TO BE PAVED AND FOR SPREADING THE SAME OVER THE SURFACE, SAID PAVING MACHINE COMPRISING (A) A HOPPER ADAPTED TO RECEIVE PAVING MATERIAL THEREIN AND HAVING A DISCHARGE OPENING FOR DISCHARGING THE PAVING MATERIAL ONTO THE SURFACE TO BE PAVED, (B) SUPPORT MEANS CONNECTED TO SAID HOPPER AND ADAPTED TO ENGAGE THE SURFACE TO BE PAVED FOR SUPPORTING SAID HOPPER ABOVE THE SURFACE FOR MOVEMENT THEREOVER, (C) COMPACTING MEANS MOUNTED ON SAID HOPPER REARWARDLY OF AND ADJACENT TO THE DISCHARGE OPENING OF SAID HOPPER AND ADAPTED TO ENGAGE THE PAVING MATERIAL BEING DISCHARGED THEREFROM FOR PARTIALLY COMPACTING THE PAVING MATERIAL AS THE PAVING MACHINE MOVES OVER THE SURFACE, (D) A SCREED ADJUSTABLY MOUNTED ON SAID HOPPER REARWARDLY OF SAID COMPACTING MEANS FOR VERTICAL ADJUSTMENT TO VARY THE ELEVATION ABOVE THE SURFACE TO BE PAVED AND BEING ADAPTED TO ENGAGE THE PARTIALLY COMPACTED PAVING MATERIAL FOR SPREADING THE SAME OVER THE SURFACE TO BE PAVED TO A PREDETERMINED THICKNESS AND FOR SMOOTHING AND FURTHER COMPACTING THE PAVING MATERIAL AS SUCH SCREED MOVES WITH SAID HOPPER OVER THE SURFACE, (E) AN ELONGATE, HORIZONTALLY DISPOSED LUBRICANT SUPPLY TANK ROTATABLY MOUNTED ON SAID HOPPER ABOVE SAID SCREED FOR ROTATION ABOUT A HORIZONTAL AXIS AND HAVING A LONGITUDINALLY EXTENDING ROW OF SPACED-APART LUBRICANT DISPENSING OPENINGS IN ONE SIDE THEREOF WHICH IS NORMALLY THE UNDER SIDE OF SAID TANK, SAID SUPPLY TANK BEING ROTATABLE ABOUT ITS AXIS TO POSITION SAID ROW OF OPENINGS ON THE UPPER SIDE OF SAID TANK TO TERMINATE THE FLOW OF LUBRICANT ONTO SAID SCREED, AND (F) VALVE MEANS MOUNTED ON SAID TANK FOR VARYING THE ADMISSION OF AIR TO THE INTERIOR OF SAID TANK FOR METERING THE FLOW OF LUBRICANT THROUGH SAID OPENINGS ONTO SAID SCREED FOR PROVIDING A SUBSTANTIALLY UNIFORM PREDETERMINED AMOUNT OF LUBRICANT ON SAID SCREED DURING THE PERIOD WHEN THE SAME IS DESIRED TO BE LUBRICATED.