US1255050A - Method of forming flange-grooves and molds therefor. - Google Patents

Description

l. H. QUINBY..

METHOD oF mamma FLANGE GRoovEs AND MoLDs THEREFDR.

AFPLlxJATlON FILED JUNEIZI; i917. l

. Patented Jan. 29,1919

flevqfr. l

HIS ATTORNEY iii? JAMES H. QUINBY, 0F SAN JOSE, CALIFORNA.

Specification ot Letters Patent.

raeemea aan. so, isis.

Application led June' 12, 191.17. Serial No. 174,245. I

To all 'whom z't may concern:

Be it known that I, JAMES H. QUINBY, a citizen of the United States, and resident of San Jose, in the county-of Santa Clara. and State of California, have invented a certain new and useful Improvement in the Methods of Forming FlangeG`rooves and Molds Therefor, of which the following is a specification.

'My invention relates to a method of forming-a groove in asphalt paving alongthe inner side of the ordinary T rail .where the fiange of the car wheel operates, and to providing a suitable strip for the molding of said groove.

It is, of course, obvious 'that in paving that portion of a road or street lying hetween car rails a space must he provided close to the inneredge of each rail to accommodate the anges on the car wheels.

When an asphalt paving is used this space or groove is sometimes provided by using a Trilby rail so that no groove is required in the pavement itself, but this is necessarily such an expensive method of providing the required groove that a T rail is ordinarily used and the groove worked in the pavement by hand labor while the said pavement is being laid.

The formation of this groove by hand labor is objectionable for several reasons. lt is far from heilig uniform, and pockets are toi-med in which dirt and refuse accuniulate. The slope of the side of the groove is so gradual that it offers a noticeable depression to vehicle wheels when crossing the rails at right angles, and permits vehicle wheels to drop into the'groove when running parallel with the track with the resulting serious difficulty and danger of turning the same back to the normal surface of the road. In the finished asphalt pavement the voids must he reduced to a minimum, therefore hand worked grooves cannot be as permanent as the roller finished main surface as the required compression is effected only to a slight depth while in the roller finished surface" the required compression is effected throughout the entire depth of the asphalt. The natural result is that the shoulder of the groove is easily worn and broken away and requires constant repairing.

It is, therefore, the object of my invention to provide a method providing substantially all of the advantages of the Trilby rail,

overcoming all of the diiiculties enumerate?L above, and eti'ectmg a substantial saving in material and labor.

In the accompanying drawing, which will method,

Figure 1 is a sectional, perspective view through a rail and a portion, of street paving with mold in position after rolling.

Fig. 2 is a transverse cross section through a rail and a portion of street paving atteithe saine 4has been rolled andthe mold removed. y Q

Similar characters of reference refer to similar parts throughout the several views. At l is indicated a T rail, at 2 is indi cated a portion of' the concrete base of the street or road pavement, and at 3 is indicated the finished asphalt surface of that portion of the pavement von the outer side of the rail l.

tion of its width and then curving upwardly and inwardly in the form of an ogee curve to join the inner edge of surface 5.

At 4 is indicated a strip of suitable material, preferably wood, having,v

i substantially flat throughout about; one and one-half inches of the lower por l/Vhen the asphalt 8 is placed in position on the inner side of rail l and on concrete hase i). and 1s prepared for rolling, strip 6 is Aplaced in the position shown iii dottedlines at (3" in Fig. 2, dotted line 8a indicating the surface ot the asphalt before rolling. When the said asphalt is rolled the strip ialiliem Wise rolledl and forced into the position shown in Fig. 1, thereby compressing the underlying asphalt Ato substantially the same degree as the balance of the asphalt and forming a hard and permanent groove in Which the fiange-9 of car Wheel l() may freely operate; l2 have found that by forming compression surface 7 'as shown and above described I can form a groove with a permanent, hard, compressed surface which presents no edges that Will'break away, that is uniform in size and Wearing qualities, that requires no hand tooling, anditliat in isfactorily Withstands the Wear and scrapclose to the inner` edge of the rail.

ln F ig. 2 the dotted line 6 indicates that mold 4 may be first positioned in a substantially horizontal position, but the position shown at 6 is deemed the best because the mold having'its outer edge positioned against the rail as at 11 the rolling of the same causes it to eXert an inward as Well 4 as a downward pressure at point 12 where the greatest strength and therefore the greatest Compression is required. It has been found that informing the shoulder of the groove as above set forth the results `are substantially equal to those secured by the use of the Trilby rail and at very Considl rolling. rolling the strip simultaneouslywith the asphalt, and finally reniioving the said strip. l

f lThe method of forming a flange groove in asphalt pavements and along the inner side of a rail, which -consists in bedding a mold strip in the asphalt parallel with the rail and against its inner edge and with theinner edge of its upper-surface substantially aaeaoeo flush with said asphalt, said asphalt being in condition for rolling, then rolling the said strip simultaneously with the said asphalt and finally removing the said strip.

3. The method of forming a iange groove in asphalt pavements and along the inner side of a rail, which consists in bedding a mold strip in the asphalt with its upper and outer edge substantially parallel with and a distance above the upper and inner edge of the rail, and its Lipper andinner edge substantially flush with said asphalt, said aslphalt being in condition for rolling, then rolling the said strip simultaneously With the said asphalt and finally removing the said strip. i

4; rlhe method of forming a fiange groove in asphalt pavements and along the inner side of a rail, which consists in bedding mold strip having an ogee compression surface in the asphalt and parallel with the inner edge of the rail, said asphaltv being prepared for rolling, then simultaneously rolling said asphalt and said strip, and finally removing said strip.

ln testimony whereof I have hereunto atied my signature this 7th day of June, 191

Janes n. @Unter

Images