US3261271A - Paving machine - Google Patents

Description

L. J. TOMASO PAVING MACHINE July 19, 1966 4 Sheets-Sheet 1 Filed Oct. 15. 1963 0m 5 mm *INVENTOR.

LOUIS J. TOMASO ATTORNEYS July 19, 1966 L. J. TbMASO 3,261,271

PAV'ING MACHINE Filed Oct. 15, 1963 4 Sheets-Sheet 2 LOUIS J. TOMASO INVENTOR.

ATTORNEYS July 19, 1966 L. J. TOMASO 3,261,271

PAVING MACHINE Filed on. 15, 1963 4 Sheets-Sheet 5 F|G 5 FIG INVENTOR.

LOUIS J. TOMASO F|G 9 BY ATTORNEYS July 19, 1966 J, o so I 3,261,271

PAVING MACHINE Filed 001;. 15. 1963 4 Sheets-Sheet 4 LOUIS J. TOMASO INVENTOR.

ATTORNEYS United States Patent() 3,261,271 PAVING MACHINE Louis J. Tomaso, Seattle, Wash., assignor to Northwest Construction, Inc., Seattle, Wash. Fiied Oct. 15, 1963, Ser. No. 316,229 9 Claims. (CI. 9445) This invention relates to improvements in what are generally designated as Paving Machines. More particularly, it relates to an improved paving apparatus operable for the settling or for the compacting of a plastic paving material such as concrete upon its being deposited and spread on a prepared roadbed or base surface, and which apparatus, incident to this ope-ration, shapes the surface of the compacted paving material to the desired crown or troughing and trowels or finishes the shaped surface.

It is a primary object of the present invention to provide a machine with a main frame structure that is equipped at its ends with driven wheels for its rolling support and guided travel on the usual form members that define the opposite side edge limits of the pavement; that is adjustable in length to span road beds or strips of various widths and which machine embodies, as a principal or characterizing feature thereof, two troweling and surfacing rollers which together span the road bed or strip being paved and which are rotatably driven for the compacting, surface shaping and troweling of the paving material as the machine is advanced along the roadbed.

It is also an object of this invention to provide means for effecting the vertical end adjustments of the two troweling and surface forming rollers as required for establishing the desired crowning, leveling or troughing of the top surface of the paving strip.

Another object of the invention resides in providing the machine frame structure with transporting wheels at opposite sides, medially of its ends, whereby the machine may be supported for towing travel from one place of use to another and which wheels are adjustable to and from their positions of functional use without repairing their detachment from the main frame structure of the machine.

Further objects and advantages of the present invention reside in the specific means for adjusting the troweling rollers for establishing the desired extent of crowning or extent of troughing; for adapting the span of the unit troweling rollers and machine to road beds or prepared areas of various widths; in the equipping of the unit with a pair of ground wheels and adjusting means therefor whereby they may be adjusted from and into positions for ready towing travel of the machine along a highway and in the details of construction of its various novel parts and in their combination and mode of use, as will hereinafter be described.

In accomplishing the above mentioned and other objects of the invention, I have provided the improved details of construction, vthe preferred forms of which are illustrated in the accompanying drawings, wherein FIG. 1 is a side view of the present paving machine as extended between and for travel on the forms defining the opposite side limits of a roadbed;

FIG. 2 is a top or plan view of the machine, as seen in FIG. 1.

FIG. 3 is an enlarged end elevation of the present machine, particularly showing the supporting wheels at that end and their powered driving means.

FIG. 4 is a vertical section taken longitudinally of the machine substantially on line 44 in FIG. 2 with portions of the main frame broken away to shorten the view.

FIG. 5 is an enlarged, cross-sectional view of parts taken on line 55 in FIG. 4, showing one of the vertically adjustable troweling roller supporting slides.

FIG. 6 is an enlarged, cross-section taken on line 66 in FIG. 4, showing the pivotal support for the inner end of one of the troweling rollers.

FIG. 7 is an enlarged, vertical cross-section taken on line 77 in FIG. 1 showing the telescopic mounting of parts of the main frame structure.

FIG. 8 is a view, longitudinally of the machine frame, shown in dash-dot lines, but with the two troweling rollers shown in solid lines, as adjusted to form a crowned top surface.

FIG. 9 is a similar view, but showing the troweling rollers adjusted to form a troughed surface.

FIG. 10 is a section on line 1010 in FIG. 3, showing the mounting and part of the driving means for one of the machines supporting end wheels.

FIG. 11 is a fragmental showing of one of the frame adjusting cylinders and its connections.

FIG. 12 is a schematic showing of the hydraulic control system.

The present machine, briefly described, comprises a horizontal main frame structure made up of parts that are telescopically adjustable in order to accommodate the machine to prepared roadbeds of various widths. As shown in FIGS. 1 and 2, the main frame structure is in an extended adjustment and it is seen, particularly in FIG. 2, to be rectangular in plan and at its opposite ends comprises hollow horizontal transverse housings 1010 which are joined at corresponding ends in their laterally spaced relationship by paired, vertically spaced cylindrical shafts 1111 which have their outer ends fixedly secured in the corresponding housings 1010 and have their inner end portions telescopically adjustably contained as in FIG. 7, in opposite end portions of elongated housing or beams 12-12 that define the medial opposite side portions of said rectangular frame structure well shown in FIG. 2.

At their opposite ends, each of the opposite end housings 1010 are equipped on their under side with downwardly directed gear housings 13, each of which mounts a stub axle 14 horizontally therethroug-h as shown in FIG. 10. Each of said axles 14, at its outer end, mounts a flanged frame supporting wheel 15. It is to be observed in FIGS. 1 and 2, that the machine frame is shown as spanning a prepared roadbed 16 as defined between laterally spaced forms 1717 that serve as rails on which the two wheels at opposite ends of the machine are mounted for rolling travel. The Wheels 15-15 at both ends of the main frame are adapted to be driven in like manner by chain belts and gearing which will be best understood by reference to FIGS. 3 and 10 wherein it has been shown that the stub axles 14 which mount the wheels 15 fixedly thereon, are revolvably mounted in the corresponding housings 13 and are equipped, within their respective housings, with shaft driving sprocket wheels 18. In opposite ends of each end frame housing 10, directlyabove the stub shafts 14, are counter shafts 19, each with a driving sprocket wheel 20 fixed thereon as in FIG 10. Chain belts 21 operate about aligned sprockets 18 on shafts 14 and sprockets 22 fixed on corresponding countershafts 19. Other chain belts 23 extending horizontally, as shown in FIG. 3, operate about sprocket wheels 20 and sprocket wheels 24 fixed on a driven shaft 25 that is mounted in the housing 10 medially of its ends; shaft 25 being driven by a hydraulic motor 26 that is powered by means presently to be described for moving the machine along the forms 17-47. V The driving means for the pairs of wheels 15-15 at opposite ends of the main frame are alike and the above description, as applied to those wheels at one end, as shown in FIG. 3, will suffice for the wheels 15 at the other end.

The means for effecting a telescopic adjustment of the paired shafts 11-11 at each of the opposite ends of the main frame into or from the corresponding ends of the medial side beams 12-12 of the rectangular main frame structure, comprises the following parts: Referring particularly to FIGS. 2 and 11, it is to be observed that for making this telescopic adjustment at each end, a hydraulic cylinder 30 is fixed at its inner end to a cross beam 31 located near the middle of the main frame structure, and extends parallel with the longitudinal axis of the main frame. Each cylinder 30 has a piston fitted therein with its piston rod 32 extended therefrom and connected at its outer end to a push frame member designated at 33 in FIGS. 2 and 11 fixed to the corresponding housing 10. When hydraulic pressure medium is applied within the inner end of a cylinder 30, it extends the piston rod 32 therefrom thus to telescopically adjust the housing supporting shafts 11-11 from the side beams 1212 and lengthen the main frame accordingly. This application of pressure medium to the outer end of a cylinder 30, likewise retracts its piston rod and the shafts 11--11 and thus effects shortening of the frame accordingly. The means for effecting adjustment of the housings 1il-10, at both ends of the main frame, are alike and as above described. The application of hydraulic pressure medium to the two cylinders 3030 is placed under conventional control and the pressure medium is supplied selectively to either the inner or outer ends of the cylinders through hose connections, as at 3333' leading from a source of supply as presently described in the describing of FIG. 12.

This telescopic adjustment of the end 10 members of the main frame is for the purpose of adapting the machine to the width or span of a roadbed, that is to be paved. Also to retract the frame to a shortened length that best suits the machine for towing travel between different places of its use.

One of the primary features of the present machine resides in the provision therein of the two surface shaping and material troweling rollers 3535 which are shown in FIG. 8 as adjusted to form a crowned road surface and, in FIG. 9, are shown, as adjusted for shaping a troughed or reverse cranial surface; the crowned surface being generally employed for effecting curb drainage while the latter is for central drainage and is usually used in the paving of alleys or Ways which cannot well employ curb drainage. The troweling rollers are alike and their normal inclination as adjusted for shaping a crowned surface is as shown in FIGS. 1, 2 and 8, wherein it is noted that they extend in parallel vertical planes and together span the roadbed between the opposite side forms 17-17 with their inner ends slightly overlapped. At their outer ends, these rollers have supporting trunnions 36, as shown in FIG. 4, fixed centrally thereto. These trunnions are rotatably contained in bearings 37 formed at the lower ends of vertical plates 38 that are adjustably fixed to the outside vertical faces of the corresponding housings 10 for vertical adjustment by bolts 39, as seen at the left hand end of FIG. 4. At their inner ends, these rollers 3535 have supporting trunnions 40 revolubly contained in bearings 41 formed at the lower ends of brackets 42 that are slidably adjustable along substantially horizontal supporting bars 43 that are pivotally suspended as shown in FIG. 4 from transverse beams 44 and 45 of the main frame. The purpose of the sliding movement of the brackets 42-42 longitudinally along the roller supporting bars 43 is to permit the endwise movement of the rollers 3535 that is incident to retracting or extending the main frame to accommodate roadbeds of different widths.

Ordinarily, the outer end vertical adjustment of the rollers 35-35 is not changed to any appreciable extent after once being established but their overlapping inner ends may be adjusted upwardly or downwardly to establish the desired crowning or troughing of the surface being formed by the rollers. This crowning or troughing ad- 4 justment of rollers 3535 is accomplished by the following descirbed means.

First, it is to be noted that the inner end of each roller supporting bar 43, as seen in FIG. 4, is pivotally supported by a horizontal pivot pin 45 extended between vertical bars 46' fixed in a cross-beam structure 44 of the main frame, see FIG. 6, and at its outer end is supported by a vertically movable slide 47 mounted in guideway 47 that is formed by spaced vertical cross-beams 4545 of the main frame structure, as shown in FIG. 5, vertical adjustment of this end of the bar 43 is effected by means of an adjusting bolt 49 threaded downwardly through a member 49' of the beam structure. The bar 43 is longitudinally slotted for adjustment of the bracket 42 therealong. After the extending or contracting adjustment of the main frame has been made, the bracket 42 is then secured in its adjusted position in bar 43 by means of one or more bolts 51 as shown in FIG. 6 The endwise slope of a roller 35 as established by the vertical adjustment of the slide 47 as effected by bolt 4? is secured by a locking bolt 51 applied to guideway 48 and adapted to be clamped firmly against an end member of the slide 47.

With the rollers 3535 adjustably mounted as described, it is required that they be rotatably driven in order to effect the desired surfacing of the plastic concrete or other pavement material as spread thereon. This rotation of each of the troweling rollers is effected by the following means:

The outer end supporting trunnion 36 of each roller extends, as shown in FIG. 4, beyond its containing bearing 37 and is there equipped with a driving sprocket wheel 50 over which a chain belt 61 operates. This chain belt also operates over and is driven by a sprocket wheel 62 fixed on the drive shaft 63 of a hydraulic motor 64 that is suitably mounted on the corresponding end frame housing 10 and to which hydraulic pressure medium is supplied from valve controls presently to be described. The direction of travel of the paving machine, and direction of rotation of the rollers 35-35 controlled to best suit the work being done and grade of the road bed.

To provide for ready travel of the machine from one place of use to another, it is equipped with a pair of road wheels -80 which are shown in FIGS. 1 and 2 to be located at opposite sides of the main frame approximately medial of its ends; each wheel being rotatably mounted on a stub axle 81 extending outwardly from one of a lever arm 82 that is provided at a medial point on the main frame, as at 83 for vertical pivoting and at its end opposite the wheel has an operating connection through a hydraulic cylinder 84 for actuating the lever arms 8282 to swing the wheels from a raised, inoperative position, as seen in full lines in FIG. 1 to the dash line position shown in the same view, to support the machine for towing travel.

To provide for towing the machine, the main frame structure is provided at one end as in FIG. 1, with a draw bar 99 that is pivotally connected to the end housing to permit it to be swung from its full line position to FIG. 1 to the dash line position for its connecting with a towing vehicle. After the machine has been towed to a place of use and wheels 15 placed on the form rails 17-17 then the wheels 80 are lifted by retraction of the hydraulic cylinders 84, and the draw bar is swung upwardly and back to that position in which it is shown in FIG. 1. The hydraulic connections with the cylinders 84-84 is as shown schematically in FIG. 12.

In FIG. 12, a motor driven pump 1% draws hydraulic pressure medium from a storage or supply tank 101 through a shut off valve 102 and delivers it through a pressure relief valve 103 and breed valve 104 to hand controlled valves -105, which control its delivery to the hydraulic motors 2828 for driving the traction wheels 15-15 at opposite ends of the main frame for moving the paving machine along the side forms 1717 at a desired speed.

Direction of drive of these wheels is selectively obtained by reversal of the setting of the hand controlled valves 105.

Also, the motor 100 supplies pressure medium through valves 103 and 104 to hand valves 106106 that control its delivery to the hydraulic motors 6464 that drive the troweling rollers 35-35.

Motor 100 also supplies pressure medium from supply tank 101 through valves 105-105 to hand valves 108 108 whereby the extending and retracting of the hydraulic cylinders 3030 to extend the main frame structure is effected. Likewise, it supplies pressure medium to a pair of hand valves 109109 for powering the hydraulic cylinders 84-84 to swing the travel wheels 80-80 into and from travel position. This same pressure line extends through valves 108 and 109 to a hand valve 110 that controls application of pressure medium to a cylinder that swings the draft bar 90 to and from functioned position.

What I claim as new is:

1. A paving machine having a main frame structure adapted to span and equipped for travel along prepared road beds of various widths; said main frame structure comprising a medial section mounting telescopically extendable opposite end sections, two pavement finishing rolls supported for axial rotation at their inner ends from said medial section of the main frame and at their outer ends from the corresponding end sections; said rolls together spanning the roadbed with their inner ends overlapped in side by side relationship, means for axially rotating said rolls to effect their finishing treatment of the paving material; means for adjusting the rolls vertically at their outer ends and means for the endwise sliding support of the inner ends of said rolls from the medial section of the main frame structure.

2. A paving machine according to claim 1 wherein said road bed is defined between opposite edge forms and wherein said frame structure is equipped at opposite ends with Wheels for support of said machine and its guided travel on said forms.

3. A paving machine according to claim 2 including motors on opposite ends of said frame structure for driving the wheels at the ends to effect movement of said machine along said forms to eifect the paving operation.

4. A machine according to claim 2 wherein said main frame structure comprises a rigid medial section with opposite end sections that are telescopically adjustable into and from the medial section to establish the span of the frame structure and wherein each of said finishing rollers has vertically adjustable supports at its outer and inner ends to establish the level or the direction and degree of its surface crowning or troughing support.

5. A paving machine comprising a main frame structure formed by a medial section and opposite end sections; each of said end sections comprising an end housing member equipped with a pair of wheels at its ends for guided travel on the forms that define the opposite edge limits of :a roadbed, and with frame members at its ends that are telescopically adjustable into and from said medial structure to adapt the main frame to the spacing of said forms, a pair of troweling rollers with outer ends supported from corresponding end housing members of said main frame structure and their inner ends supported in overlapped relation from the medial portion of said main frame structure, for endwise adjustment in accordance with the telescopic adjustment of the main frame and means mounted by the opposite end housing sections for driving the corresponding rollers and wheels.

6. A paving machine according to claim 5 wherein the inner ends of said troweling rollers have supporting trunnions revolubly mounted in bracket bearings and said brackets are adjustable along supporting bars that extend along the medial member of the main frame structure, to accommodate the telescopic adjustment of the outer end sections.

7. A machine according to claim 6 wherein said supporting bars have pivotal mountings at one end and are vertically adjustable at their other ends to adjust the angle of slope of said rollers.

8. A machine according to claim 5 wherein the frame adjusting means comprising hydraulic cylinders mounted horizontally and lengthwise in the medial section of said main frame, each with a piston extended toward the corresponding end member and connected thereto for its telescopic adjustment and for the extending or retracting of said troweling rollers.

9. A machine according to claim 8 wherein the wheels at opposite ends of the main frame, and the troweling roller at that end are driven by hydraulic motors supplied by an engine mounted on the medial section.

References Cited by the Examiner UNITED STATES PATENTS "1,619,083 3/1927 Maxon 94-45 2,054,263 9/1936 McCrery 94--45 2,687,679 10/1954 Clary 944S 2,962,949 12/1960 ODea 94-45 3,005,387 10/ 1961 Heltzel 9445 3,113,494 12/1963 Barnes 94-45 JACOB L. NACKENOFF, Primary Examiner.

Claims (1)

1. A PAVING MACHINE HAVING A MAIN FRAME STRUCTURE ADAPTED TO SPAN AND EQUIPPED FOR TRAVEL ALONG PREPARED ROAD BEDS OF VARIOUS WIDTHS; SAID MAIN FRAME STRUCTURE COMPRISING A MEDIAL SECTION MOUNTING TELESCOPICALLY EXTENDABLE OPPOSITE END SECTIONS, TWO PAVEMENT FINISHING ROLLS SUPPORTED FOR AXIAL ROTATION AT THEIR INNER ENDS FROM SAID MEDIAL SECTION OF THE MAIN FRAME AND AT THEIR OUTER ENDS FROM THE CORRESPONDING END SECTIONDS; SAID ROLLS TOGETHER SPANNING THE ROADBED WITH THEIR INNER ENDS OVERLAPPED IN SIDE BY SIDE RELATIONSHIP, MEANS FOR AXIALLY

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