US3132642A - Pavement burner - Google Patents

Description

y 1964 J. A. FINGLAND 3,132,642

PAVEMENT BURNER Filed July 23, 1962 2 Sheets-Sheet l INVENTOR.

@ JOHN A. F/NGLA/VD A r TO/PNEVS y 1954 J, FINGLAND 3,132,642

. PAVEMENT BURNER Filed y 2 2 Sheets-Sheet 2 ,pnn'ulilm 'iilpullii INVENTOR. JOHN A. F/NGLAND ELL/2W 5 WM A T TO/P/VEVS United States Patent 3,132,642 PAVEMENT BURNER John A. Fingland, 1G1 Fairview Ave., Piedmont, Calif. 1

Filed July 23, 1962,.Ser. No. 211,702

4 Claims. (Cl. 126-2712) My invention relates to means'having a variety of uses but especially finding application in the heating of pavement such as asphalt or macadam pavement for repair purposes. .It is customary to draw a vehicle over pavement to be repaired with the vehicle having a flame burner for heating thepavement to an appropriate degree for subsequent working. It is difficult to provide a sufliciently uniform and elfective flame over a large area in order to afford consistent treatment to the pavement in a zone large enough to be economically feasible and to afford effective speed for the work. It is also difficult to provide such a burner in'which the products of combustion are sufficiently bland and innocuous to discharge in thevicin ity without substantial objection. l

It is therefore an object of my invention to provide a pavement burner which affords a uniform flame for heating evenly a relatively large or extensive subjacent area of the pavement to be treated.

Another object of the invention is to provide a pavement burner in which the combustion is sufliciently good so that the'discharge of the combustion products in the immediate vicinity of the burner is not hazardous and does not give rise to objections.

Another object of the invention is to provide an improved and simplified pavement burner.

A still further object of the invention is to provide a pavement burner which can easily be fabricated and can readily be repaired and adjusted.

Another object of the invention is in general to provide an improved pavement burner.

Other objects of the invention together with the fore going areattained in the embodiments of the invention described in the accompanying description and illustrated.

' 40 FIGURE 1 is a plan of a pavement burner constructed in the accompanying drawings, in which:

in accordance Withthe invention and shown in position for use;

FIGURE 2 is a front elevation of the structure shown in FIGURE 1; v

FIGURE 3 is a detailed cross section, the plane of section being indicated by the lines.3-3 of FIGURE 1; v

FIGURE 4 is a detailed cross section, the. plane of section being indicated by the lines 44 of FIGURE 1;

FIGURE 5, is principally a cross section, the plane of which is indicatedby the line 5-5 of FIGURE l; and

FIGURE 6 is an isometric view of a modified form of burner pursuant to the invention, portions of the structure being shown in a transverse section. v

While the pavement burner can be incorporated in a number of different ways, it has been commercially-made substantially-as illustrated herein. In general there is provided a frame 6 which is a metal skeleton fabricated of structural shapes to constitute a carriage. The frame includes elevated sides 7 and 8 and coplanar ends 11 and 12. The frame is supported 'on wheels 13. In practice the carriage is adapted to be advanced over the pavement 14. A subframe 15 is adjustably hung from themain frame 6 by chains 16 and adjusting screws 17.

Disposed on the subframe 15 and extending lengthwise thereof in the general direction of advance of the carriage over the pavement are various burner casings generally designated 18. Since the casings are identical, a description of one applies equally to the others. In the present instance the casings are arranged parallel to each other and are substantially evenly spaced across the frame and extend for substantially the entire, length of the frame in the direction of advance.

As shown particularly in FIGURES 4 and the casings 18 is an integral metal casting having a top wall 21, side walls 22 and 23 which approach each other. as they extend downwardly, and end walls 24 and 26. Thus, each casing is substantially a slightly tapered but nearly rectangular box having a hollow interior. The casing at its opposite ends is provided with aligned, projecting lugs 27 and 28 rotatably supported in boresf29 in the subframe ends. Clampbolts 31 movable inslots 32 firmlyhold the burner casings in any selected inclined position about the axis of the lugs 27 and 28. Each cas-.

ing is thus adjustably but firmly fixed in place despite expansion and. contraction and can readily be removed for repair, replacement or rearrangement.

Spanning the interior of the casing at an appropriate point is a horizontal ortransverse median wall 34' whichmerges witlithe side and end walls. of the casing to enclose an upper chamber 36. The wall 34 throughout its length and at appropriately spaced intervals is provided with elongated through openings 37. The openings extend'in series from one erid of the casing to the other.

Also spanning the side and end walls of the casing in a location below the median wall 34 is a horizontal intermediate wall 38 preferably formed integrally with the remainder of the casing and with it enclosing an intermediate ,;chamber 39 which extends for the full length and width of the casing. J p

In a similar fashion a lower wall 41 merges with the end Walls and the side walls of the casing and extends horizontally across the casing to define 'a lower chamber 42. lower margin of the casing inorder to leave depending flanges 43 and 44 extending entirely around'the bottom of the casing.

The lower wall'41 preferablyprovided. with a plurality of apertures 51 and 52 uniformly distributed throughout their areas. Preferably, the apertures 51 and 52 are madeby drilling through both the lower wall and the intermediate wall so that the apertures ar substantially in vertical alignment. 1

If desired, the lower wall may have more apertures than the intermediate wall s'implyby not drilling all of the aperturesin the lower wall through the intermediate 'wall.

Preferably located coaxially with the end lug 27 is an opening 53 to allow access of a combustible mixture to the interior of the casing, the mixture being supplied to all of 'the casings from acom'mon source and in parallel.

For thatpurpose feed tubes, 54 project into the margins l of. the variousopenings 53'and connect with the hollow lugs'27. A pair of manifolds 57 connect with all of the pipes 54. Supply pipes 58 extend through valves 59 from a suitable fuel source'such as atank of butane, thence in. close thermal relationship with some of the burner casings and then to thejmanifolds 57.

In the operation of this device, a supply of gas such as propane or butane or an equivalent materialis fed through the pipes 58 and entrains and is mixed with a sufficient quantitywof atmospheric air entering through Venturis 61 p so as to afford a combustible mixture in the pipes 54 and the casings 18. The gas-air mixture is confined tempo rarily in the upper chambers 36 of the casings. Since the openings 37 are relatively small and are spaced apart for the entire length of the burner casing, the incoming gas is well distributed and maintains a substantially uniform pressure throughout the elongated upper chamber.

The gas then flows uniformly through the various, spaced-apart openings 37 into the intermediate chamber 39. Again, the number and location of the apertures in the intermediate Wall 38 is such that a substantially uni form pressure obtains within the chamber 39 so that flow Patented May 12, 1964.

5, each of The lower wall 41 is preferably spaced above the and the intermediate wall 38 are is partially confined between the flanges 43 and 44. In

this protected zone between the flanges and below the wall 41 the combustible mixture is finally mixed with secondary air from the atmosphere and is ignited so that flame appears beneath the lower plate 41 and travels outwardly beneath the burner to the sides thereof, depending upon the burner inclination. The flames can be directed as desired at any selected angle. There is an adequate supply of air for combustion so that smoke and carbon monoxide, particularly, are virtually eliminated. The products of combustion escaping to the atmosphere are bland and innocuous.

To assist in ignition and to provide for automatic relighting should any of the flames become accidentally extin guished, pilot gas tubes 62 extend through flexible connection to pilot burners 63.

By the provision of this structure, the incoming gas-air mixture is not only throroughly intermixed and made substantially homogeneous before combustion by being passed through a plurality of series of apertures, but also the gas supply from the source at one end is distributed quite uniformly or is directed and concentrated as desired despite the number and length of the casings so that when combustion ensues the entire covered pavement area can be treated substantially evenly or in a concentrated fashion, as desired. 7

During combustion the burner casings become hot since they are subjected to the surrounding flames, and they expand and contract in amounts somewhat different than the expansion and contraction of the supporting subframe 15, but the pivot lugs 27 and 28 allow easily for such movement without inducing strains in the burner casings or in the subframe. 1

For confining the flames and directing them to a special part of the pavement, each of the casings is provided with lugs 64 pivotally supporting guard plates 66 adjacent the frame sides. Guard plates 67 at the ends swing from links 68 on the subframe 15. Between the casings, cover plates 69 supported by the lugs overlap in any of the varioustilted positions of the casings and assist in confining the combustion.

In some instances, instead of using. an integral castingv to form the burner casingI prefer to bend a plate or sheet of metal such as steel into a U form and invert the U as shown in FIGURE 6. In this'instance there are provided side walls 72 and 73 terminating in lower edges 74 so that there is aflorded a burner casing of approximately the same contour and enclosure as the casing shown in FIGURE 4, for example. The ends of the inverted U are closed by appropriate end plates, not shown, and an apertured bottom plate 76 is flanged and welded into position to afford a position for the apertures 77 therein above the lower edges 74. Before the end plates are fixed in the casing, a metal tube 78 is inserted therein and is welded at appropriate intervals. The tube 78 is provided at its top with a series of elongated openings 79 throughout its length and at its bottom is provided with a number of apertures 81 which substantially line up with the v I 4 I apertures 77. The tube 78 when in position helps define an upper chamber 82, itself encloses an intermediate chamber 83 and also with the bottom plate 76 defines a lower chamber 84. The depending flanges enclose a protected zone for final mixture with secondary air. The structure of FIGURE 6 is arranged on a subframe 15 and is supplied witha gas-air-mixture just as described in,

connection with the other embodiment.

In both forms of the invention illustrated herein, the pavement burner is especially eifective to afford a homogeneous mixture for combustion and effectively distributes the mixture and the resulting flame quite uniformly over a much larger area than heretofore has been deemed prac tical. The operation of the burners is such that the products of combustion discharging from the unit are. unobjectionable.

Whatis claimed is:

1. A pavement burner comprising a frame adapted to be positioned just above a pavement; a plurality of elongated burner casings, each of said casings including a substantially horizontal top wall, a pair of substantially vertical side walls, and a pair of substantially vertical end walls, and each of'said burner casings including a substantially horizontal median wall extending across said casing and having openings therein at intervals and constituting the bottom of an upper chamber in said burner casing, a substantially horizontal intermediate wall extending across said casing and constituting the bottom of an intermediate chamber, a substantially horizontal lower wall extending across said casing and constituting the bottom of a lower chamber, said intermediate Wall and said lower wall having apertures therethrough; means for mounting said burner casings on said frame in horizontal, parallel relationship and for rotation about horizontal, parallel axes, said mounting means including a plurality of hollow lugs each concentric with one of. said axes and disposed on one of said end walls in communication with said upper chamber; means for holding said burner casings in selected positions of rotation about said axes; and means for conducting a combustible mixture through said hollow lugs to said upper chamber. 7

2. A pavement burner as in claim 1 in which said side walls and said end walls depend below said lower wall and are imperforate to define a protected zone beneath said casing. g

3. A pavement burner as in claim 1 in which said apertures in said intermediate wall and said lower wall are in substantially vertical alignment.

4. A pavement burner as in claim 1 and including substantially horizontal overlapping cover plates movably mounted on said side walls and extending longitudinally of said burner casings.

References Cited in the file of this patent UNITED STATES PATENTS 851,486 Bennett Apr. 23, 1907 1,077,260 Daley Nov. 4, 1913 1,322,459 Mattern Nov. 18, 1919 1,552,355 Starner Sept. 1, 1925 1,610,542 Wilson Dec. 14, 1926 1,619,516 Howell Mar. 1, 1927 2,219,787 Parker Oct. 29, 1940 2,228,114 Hess Jan. 7, 1941 2,457,683 Kittel et al. Dec. 28, 1948- 3,055,280 Neville Sept. 25, 1962 3,080,912 Winter Mar. 12, 1963

Claims (1)

1. A PAVEMENT BURNER COMPRISING A FRAME ADAPTED TO BE POSITIONED JUST ABOVE A PAVEMENT; A PLURALITY OF ELONGATED BURNER CASINGS, EACH OF SAID CASINGS INCLUDING A SUBSTANTIALLY HORIZONTAL TOP WALL, A PAIR OF SUBSTANTIALLY VERTICAL SIDE WALLS, AND A PAIR OF SUBSTANTIALLY VERTICAL END WALLS, AND EACH OF SAID BURNER CASINGS INCLUDING A SUBSTANTIALLY HORIZONTAL MEDIAN WALL EXTENDING ACROSS SAID CASING AND HAVING OPENINGS THEREIN AT INTERVALS AND CONSTITUTING THE BOTTOM OF AN UPPER CHAMBER IN SAID BURNER CASING, A SUBSTANTIALLY HORIZONTAL INTERMEDIATE WALL EXTENDING ACROSS SAID CASING AND CONSTITUTING THE BOTTOM OF AN INTERMEDIATE CHAMBER, A SUBSTANTIALLY HORIZONTAL LOWER WALL EXTENDING ACROSS SAID CASING AND CONSTITUTING THE BOTTOM OF A LOWER CHAMBER, SAID INTERMEDIATE WALL AND SAID LOWER WALL HAVING APERTURES THERETHROUGH; MEANS FOR MOUNTING SAID BURNER CASINGS ON SAID FRAME IN HORIZONTAL, PARALLEL RELATIONSHIP AND FOR ROTATION ABOUT HORIZONTAL, PARALLEL AXES, SAID MOUNTING MEANS INCLUDING A PLURALITY OF HOLLOW LUGS EACH CONCENTRIC WITH ONE OF SAID AXES AND DISPOSED ON ONE OF SAID END WALLS IN COMMUNICATION WITH SAID UPPER CHAMBERS; MEANS FOR HOLDING SAID BURNER CASINGS IN SELECTED POSITIONS OF ROTATION ABOUT SAID AXES; AND MEANS FOR CONDUCTING A COMBUSTIBLE MIXTURE THROUGH SAID HOLLOW LUGS TO SAID UPPER CHAMBER.

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