US1733198A - Apparatus for manufacturing pavement - Google Patents

Description

04th 29, 1929. c, MULLEN 1,733,198

APPARATUS FOR MANUFACTURING PAVEMEfiT Original Filed June 18, 1926 2 Sheets-Sheet l Oct. 29, 1929. Q MULLEN 1,733,198

APPARATUS FOR MANUFACTURING PAVEMENT 1 Original Filed June 18, 1926 .2 Sheets-Sheet 2 Patented bet. 29 1929 UNITED. "STA omnnsnuous'rmn MULLER, or mon'rnnnn, QUEBEC, CANADA APPARATUS iron MANUFACTURING PAVEMENT Original application filed June 18, 1926, Serial No. 116,996. Divided and this application filed December I l 5, 1927. Serial No. 237,901,

This invention relates to improvements in apparatus for manufacturing pavement, and in general, my invention relates to that type of pavement which is constructed of one, two,

or more layers of inixtures, which mixtures consist of intermingled, irregularly shaped rigid mineral or other particles, such as crushed stone, gravel, slag,"sand, dust, known as the aggregate, coated ,and cemented to gether by bituminous plastifimaterial, such a asasphalt, tar, oil, known as the cementing medium, in which type of pavement such a layer or layers ofmixtures is spread and compacted, while still sufliciently plastic, upon a 5 foundation or base or upon another such layer of mixture which previouslyhas'been, spread,

or spread and compacted. v

In particular, my invention'relates to a novel, means and way of compacting-the type 0 of pavement described in the foregoing paragraph, and specially to a novel meansand way of compacting that type of pavement which is constructed oftwo or more layers of mixtures, each of which "mixtures consists of intermingled irregularly shaped rigid mineral or; other particles, which particles,

known as the mineral aggregate, are graded from some maximum size down to a very small size so that when'intermingled and 0 coated and cemented together by abituminous'cementing medium, spread, and com pressed, they producea dense" structure, in which type of pavement such a layer of mixture, the minerahaggregate of -which is graded from about one-tenth to one-quarter inch size down, is spread and compressed,

while sufliciently plastic, upon another suchlayer of mixture, the mineral aggregate of whichiis graded from about three-quarters to 40 one and one-half inch size dqwn, which previously has been spread, or spread and com-" pressed; and to the pavement resulting from this 'novel way of compacting, which'is itself novel in that it has characteristics-resulting from this novel method of compacting, such:

as greater uniformity'of density and pcompaction.

Heretofore, the compacting of this type of pavement has been accomplished, in the 50. earliest years of the industry, by gang tamping which consisted of a number of laborers lifting and'dropping heavy tamping irons on the mixtures after they have been distributed to place; and, later, by: both hand and self-propelled rollersQ Each of these methods has its faults, most of which, my invention eliminates.

Hand tamping was superior to'rolling because the vertically delivered blow'compacts bituminous paving mixtures better than slowly applied pressure from a roller, which has a tendency to shove the material ahead rather than to drive it vertically down into place, but hand tamping required much 1 labor, and the difficulty in maintaining a gang of workmento sohigh a point of efficiency that it would be properly done was almost insurmountable. Tamping is also superior because, as the face of the tamper is short, it operates on an area so restricted that there is the minimum of opportunity for bridging sections where the mixture has not been spread sufliciently heavy. 1 r

Hand rolling is impractical for securing compaction for the reason that it is not possible to operate a sufliciently heavy roller for thatpurpose by hand power; yet, it is free from one of the principal objections to self propelled rollers operated by steam or otherwise, in that power, being applied by men at the end of a long handle, the thrust of propulsion is not in the roller itself, and thereof a hand vroller is not nearly so great.

The purpose of my invention is to secure-a method of compacting bituminous paving mixtures i-nto pavements such as I have defrom the objections to the methods previously in use; and to this end I have applied mechanical power tampi'ng through an apparatus, tamper or roller, which'is referably not self-propelled by means 0 the fore the tendency to shove the mixture ahead I scribed which will be, as far as ppssible, free a surface delivering the blows, Com ressed' air has so far been usedas the vme c anical power but obviously steam, electricity, or any other source of, artificial power wi11 produce at least approximately the same result.

' A further purpose of my invention is to permitthe economical laying of such asphalt i paving mixtures as I have described in relatively small areas in buildings, on tennis courts, and in all restricted places where only the mastic asphalt method is now regularly used, which produces a pavement or flooring. with undesirable. characteristics resulting from said mastic method of floating the mixers are moved from place to place, which is too expensive for small area work.

My mvention consists in a method of compacting a pavement, in one or more layers,

and in the pavement resulting from. the application of that method, and the apparatus therefor, by which method I secure a pavement more uniformly and more satisfactorily compacted than heretofore possible, by employing in combination the distributing into place of bituminous paving mixtures and op- 1,7es,1es

lic roller designed to be moved over the surface of the material to betamped and while being moved to be subjected to power blows. The form of roller illustrated is formed with corrugations 10 designed to impress a predetermined pattern on the surface being tampe'd. The roller"ear ries an axle 12 on which the tamping means B are mounted by means of a frame C. The frame 0 is conveniently in the form of an arch having end extensions 13 and 14 with journals 15 and 16 mountedon the ends of the axle 12. The central part 17 of the arch constitutes an anvil or shock-distributing member to receive the blows of the plunger 18 of the power tamping device B. This power tamping de vice 'B may be conveniently in the form of an air gun, the construction of which is crating thereupon while they are still suifiin the art and h,Wh n supplied ciently plastic a power driven tamping plate or roller of such size as to give the desired degree of-compaction without having a suffi: cient length of plate or roller bearing upon the mixture to spanlsect-ions where the distributionis not sufficiently heavy.

A further. feature of my invention consists in applying this method to a two or more layer pavement such as patented to me by the Canadian Patent Ofifice under Letters Patent Number 247,652, issued -March 17, 1925, in which the plate or roller transmitting the tamping blows to the asphalt paving mix ture used for an under layer bears a pattern as set forth in aforesaid Letters Patent; and, where, if it is desired to use the same method for compacting the top or surface layer, then inorder to produce a non-slippery, non-skid surface, the. plate or roller may bear a pattern for producing a uniformly marked surface,

. or, if a perfectly smooth surface is desired,

then the surface of the plate or roller may be smooth. I 1

My improved method may be carried out and my improved pavement constructed by the preferred apparatus hereinafter described in detail.

In the drawings, in which like characters of -'reference indicate corresponding parts A in all figures:

Figure 1 is an elevation of one embodiment of apparatus'which may be used to carry out my inventionand which, as apparatus itself, contains certain features of the invention;

Figure 2 is an elevation of an alternative form of roller which may be used;

Figure 3 is an end elevation of the apparatusshown in Figure 1; v

with a source of compressed air as from the pipe 19, is designed to cause the member 18 to deliver a plurality of power blows on the member 17 which are thereby transmitted through the, axle '12 to the tamping member A. Means may be provided for'absorbing the shock of the air gum-such means comprising supporting arms 20 and 21 leading from the outer extremity of the frame C and extending through a cross bar 22 connected to the member B, springs 23 extending from nuts 24 on the arms 20 and 21 to the upper side of the cross bar, whereby the upward movement of the power gun will beresisted by the said spring.

Means are conveniently provided for manu-' any or otherwise propelling the tamping contain lubricating material such as oil-saturated waste which will clean the surface of the roller A, and having sides 25 and 26 which act as a scraper on the roller.

The form of the roller Af shown in Figure 2 diifers only in the form of pattern from the roller shown in Figure 1. Another varied form of pattern is shown in Figure 4:, where the roller A is formed with spiral grooves.

It will be observed that the oil waste in the box E in addition to' wiping the roller will serve to spread a'thin film on it as it turns over to thereby prevent adhesion of the plastamping roller is moved over it and simultaneously the air gun B is operated to deliver a rapid succession of power blows which are transmitted through the roller A which thereby serves as a compacting'member to 7 produce in the paving mixture a density subof the'mixture is insufficiently heavy. The

bearing surface is also relatively narrow and thus adapted to produce uniformity in compression. e

As many changes could be made in the above construction and many apparently widely different, embodiments of my invention, within the scope of the claims, constructed without departing from the spirit or contained in the accompanying specification scope thereof, it is intended that all matter and drawings shall be interpreted as illustrative and not in a limiting sense.

What I claim as my invention is: 1

1. A compacting tool of the character described, comprising a portable compacting roller, a frame mounted onthe roller, an anvil member formed on the frame and a power tamping device adapted to register with and deliver blows against the anvil member supported on the frame, opposed-handle means connected with the framefor moving the roller over the material to be tamped and a scraper member connected with the frame ,and adapted to'contact with the roller.

2., A compacting tool of the character described,- comprising a portable compacting roller, a framemounted on the roller, an anvil member formed on the frame and a power tamping device adapted to register with and deliver 'blows' against'the anvil member re-. silie'ntly supported on the frame, means connected with the frame for moving the roller over the material to be tamped and means for moistening the surface of the rollerto eliminate adherence of the treated substance.

3. A compacting tool of the character described comprising a portable compacting roller, a frame mounted on the rolle'r,"an anvil member formed on the frame and a power tamping device adapted to register with and deliver blows against the anvil member resiliently supported on the frame, means "connected with the frame for moving the roller over the material to be tamped, a scraper member connected to the frame and adapted to contact withthe roller,,and means for moistening the surface of the roller to eliminate adherence of the treated substance.

4:. A compacting tool of the character described comprising a ortable compacting roller formed with uni orm pattern making depressions therein, a frame mounted on the roller, an anvil member formed on the frame and a power tamping device adapted to register with and deliver blows against the anvil member resiliently supported on the frame, and opposed handle members connected with the frame for movingthe roller over the material to be tamped.

5. A compacting tool of the character described comprising a ortable compacting roller formed with uni orm pattern making depressions therein, a frame mounted on the roller, an anvil member formed on the frame and a power tamping device adapted to register and deliverblows against the anvil member resiliently supported on the frame, means connected with the frame for moving the roller over the material to be tamped. a scraper member connected to the frame adapted to contact with the roller and cooperate with the depressions therein, and lubrieating means for the roller.

6. A compacting tool of the character described comprising a portable compacting roller formed with a series of uniform corrugations therein adapted to compact and form an even pattern in the treated substance, a frame mounted on the roller, an anvil member formed on the frame, a power tamping device resiliently supported on the frame adapted to register with and deliver blows against the anvil member, and means for lubricating the surface of the roller. 7. A compacting tool of the character described comprising a portable compacting roller formed with'uniform pattern making depressions thereinfa frame mounted on the roller, an anvil member formed on the frame, an'air gun resiliently supported on the frame adapted to register with and deliver blows against the anvil member, opposed handle members secured to the frame for moving the roller over the material to be tamped, whereby said material is simultaneously rolled, tamped and formed with a uniform pattern.

8. A compacting tool of the character described comprising a portable compacting roller, a frame mounted oh the roller, an anvil member formed on the frame, a power tamping device adapted to register with and deliver blows against the anvil member supported on the frame, means connected to the frame for moving the roller over the material to be tamped, and a casing member secured to the frame adapted to encase lubricatingmeans'for the roller.

9. A compacting tool of the character demeans fobscraping and lubricating the roller including a casing securedto the frame adaptt ed-to conform to the contour of the roller and contact therewith andto encase lubricating saturated inaterial. I A 10. A compacting tool of the character described comprising a portable compacting roller, a'frame mounted on the roller, an an-' vil member 1 med on the frame, v power tamping device resiliently sup orted on the frame adapted to register wit and. deliver blows against the anvil member, means connected with the frame for moving the roller over the material to be tamped} andmeans for 5 scraping and lubricatin the roller including -2o han a casing in connection with the frame adapted to contact with the roller and encase lubrlcat ing saturated material. a

. In witness whereof I have hereunto set my HARLES AUGUSTINE MULLEN.

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