US1819304A

US1819304A - Contraction center strip

Info

Publication number: US1819304A
Application number: US417959A
Authority: US
Inventors: Robert R Robertson
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-01-02
Filing date: 1930-01-02
Publication date: 1931-08-18
Anticipated expiration: 1948-08-18

Description

Aug. 18, 1931. R. R. n'oszRTsN 1,819,304

CONTRACTION CENTER STRIP Filed Jan. 2. 1950 7 1 12 11 j .4 zygzzfilmr Boeri 2. oberzi'sam Patented Aug. 18, 1931 ROBERT R. ROBERTSON, OF CHICAGO HEIGHTS, ILLINOIS CONTRACT-ION CENTER STRIP Application filed January 2, 1930. Serial No. 417,959.

This invention relates to an improved contraction center strip or parting'strip for concrete road construction work, and covers a strip or sheet of ribbed or longitudinally corrugated sheet metal embracing upper and lower sections integrally connected by an intermediate section which is provided with spaced apertures to permit stakes or pins to be engaged therethrough to hold the strip in place upon a sub-grade, with an open bead or channel formed longitudinally along the lower edge of the strip resting or seatingin the sub-grade, and having a deflectable bead integrally formed on the upper section of the 5 strip to project slightly above the top surface of the concrete top section of the road to permit the top bead to be longitudinally deflected or grooved to a level below the topsurface of the road, forming'a center groove longitudi- 0 nally in the road adapted to be eventually filled with pitch, or the like, to mark the longitudinalcenter of the completed road.

It is an object of this invention to provide an improved contraction center strip for con- 2 crete roads which embraces a longitudinally ribbed or corrugated apertured metal strip provided with upper and lower sections integrally connected with an intermediate .V-

shaped section, the sides of which are positioned at an angle 'with'respect' to the upper and lower sections and are connected to said upper and lower sections and to one another by slightly enlarged reinforcing beads-or ribs to provide an improved reinforced center 3 strip which may be constructed of a comparatively light-weight sheet metal of reduced weight and cost. I

It is also an object of this invention to provide a concrete road contraction center strip of light-Weight longitudinally corrugated sheet metal provided with reinforcing beads along the lines of bend of'the strip, with the lower margin of the strip provided with an open rounded foot bead while the upper longitudinal margin of the strip is provided with a weakened tube or bead adapted to be longitudinally indented or grooved afterthe pouring of concrete on opposite sides of the strip to provide a road center groove adapted a be eventually filled with pitch, or the like,

after the concrete has set.

A further object of the invention is to provide a reinforced sheet metal parting strip for concrete roads with said strip having a weakened'or collapsible bead formed on the upper margin thereof normally positioned to project above the top level of the road and eventually adapted to be ,deflected or 001- ,7 lapsed below the level of the road to afford a groove for the reception of pitch, or the like, to mark the center of the'road.

It is furthermore an object of this invention to provide an improved contraction center strip adapted to be constructed of lightweight sheet metal which is corrugated and reinforced by beads or ribs along the lines of bend of the-sheet, said-strip being provided with an open foot bead along the lower margin and having a deflectable or collapsible bead formed'along the uppermargin, and

adapted, af.er the concrete has been poured,

to be deflected to afi'ord a center groove in the road for the reception of pitch, or similar material, to designate the center line of the 7 I road.

It is an important object of this invention to provide an improved concrete road contraction center strip of longitudinally corrugated light-weight sheet metal reinforced along the lines of bend by reinforcing ribs and having an open bead along the bottom margin of the strip and a deflectable bead along \he top margin, said beads stopping short of one end of the strip, which end is slightly tapered to permit the same to be frictionally and wedgingly engaged in one end of an adjacent center strip to hold the strips interlocked one with the other when placed upon the sub-grade along the center portion of a road under construction.

Other and further important objects of this invention will be apparent from the disclosures in the specification and the accompany ing drawin A a The invention" (in a preferred form) is illustrated in the drawings and hereinafter morefu'lly described.

On the. drawings:

Figure l'is an isometric view of an improved concrete road contraction center strip embodying the principles of this invention and having stakes or pins engaged through apertures thereof to facilitate supporting of the center strip in position on a road subgrade.

Figure 2- is a fragmentary side elevation of the interfitting ends of a pair of contraction center strips embodying the principles of this invention and showing the interfitting end-to-end engagement'of the strips when mounted in position upon a sub-grade.

Figure 3 is a fragmentary transverse section through a concrete road having an improved contraction center strip embedded in the concrete with the deflectable top bead projecting above the top level of the road.

Figure 4 is a similar fragmentary transverse section through the concrete road after the top bead has been indented ordeflected to provide a center groove which, as illustrated, is filled with pitch, or the like.

As shown on the drawings: I The reference numeral 1 indicates a concretetroad sub-grade having deposited there on concrete which forms the body or main portion of the road 2. Secured longitudi-.

\ nally on the road upon the top surface of the tively light-weight sheet metal :stamped or shaped out of longitudinall corsub-grade 1 by means of retaining stakes or pins 3 is an improved road contraction center or parting strip embodying the principles of this invention and comprising a comparasection rugated sheet metal into a form to a 0rd a V-cross-sectioned intermediate or middle section 4and integral upper and lower sections 5 and 6 respectively.

I The upper and lower sections 5 and 6 of the strip are disposed in substantially the same plane and areintegrally connected by means of the V-shaped intermediate section 4. The center strip is constructed of longitudinally corrugated sheet metal, thereby permitting sheet metal of reduced weight to be used to reduce the cost of the steel material used in the construction of the road. The intermediate section 4 of the center strip is provided with pairs of apertures or openings 7 through which the stakes or pins 3 are adapted to be projected, with the lower ends of .the stakes driven into the sub-grade 1.

The two corrugated or reinforced walls I forming the V-shaped intermediate section 4 are integrally connected at the apex line by an enlarged middle'reinforcing rib or head 8, Wl11Ch"eXt6I1d.S throughout-the full length of the center strip. At the lineof bend or juncture between the upper strip sectibn 5 and the upper wall of the intermediate section 4 is an upper reinforcing bead or rib 9 which is rounded outwardly ina direction opposite from the rounding of the intermedi ate reinforcing bead 8. Integrally connectin}; the-lower-strip section 6 with the lower wall of the intermediate section 4 along the line of juncture of said sections is a lower reinforcing-bead or rib 10 which is also rounded outwardly in a direction opposite from the curvature of the intermediate reinforcing head 8.

The reinforcing

ribs

8, 9 and 10 are larger than the ordinary corrugations of the sheet metal and are located directly at the angled portions of the contraction center stri This construction greatly reinforces the strip and permits a comparatively thin sheet of sheet metal-to be used in the construction of the centerstrip.

Integrally formed along the lower longitudinal edge or margin of the lower strip section 6 is a rounded base or foot bead 11 provided with an integral upwardly and outwa rdly curved flange 12. This rounded foot head 11 affordsa groove or pocket for the reception of concrete to hold the center strip anchored in position on the sub-grade. The

foot head 11. and the flange 12 thereof extend which a portion of the foot bead 11 has been cut is slightly inclined upwardly to afford a wezlging edge 14, affording an arrangement whereby one end of the contraction center strip may be slidably and frictionally engaged in the adjacent end of another contraction center strip to hold the center strips aligned in frictional interlocking engagement upon a road sub-grade.

Integrally formed on the top margin of the upper center strip section 5 is a rounded top centergroove forming bead 15 which extends from one end of the contraction center strip to a point 16 a short distance from the. opposite end of-the strip. From the point 16 to the end of the center strip the upper margin of the top strip section 5 is cut or tapered to provide an inclined wedging edge 17. The end of the contraction center strip which has the bead portions cut away and is provided with the inclined wedging edges Hand 17 affords a tail piecef'or end section which is adapted tobe slidably and frictionally. engaged in one end of an adjacent contraction center strip with -the lower wedging ede 14 engaged in the grooved base or foot ead 11, while the upper wedging edge 17 is adapted to be engaged beneath the head 15, so that the two contraction center strips lockinglyinterfit one another,

as illustrated in Figure 2, permitting the cut-' off ends of the foot head 11 and the top bead 15 of-one strip to 'abut against the ends of the bottom and top beads of the.strip with which it inte'rfits.

The top bead 15 formed on each center strip is weakened longitudinally along each side inner channel or of the bead by providing the same with a line of spaced cuts or slots 18.

The contraction center strips of the improved type hereinbefore described are adapted to be slidably engagedwith respect to one another end-to-end in frictional looking engagement, as shown in Figure 2, and are adapted to be supported in position upon the sub-grade of a road under construction. The interfitting center strips are secured in place by means of the retaining pins or stakes 3 which project through the apertures 7 and are driven into the sub-grade. When the contraction center strips are mounted in position upon the sub-grade 1, the base or foot bead 11 rests upon'the sub-grade or if necessary, may be wedged into the sub-grade a slight distance in order to position the top center groove forming bead 15 sothat the rounded upper portion thereof will project slightly above the top level of the road when the same is completed, as illustrated in Figure 3. After the interfitting aligned contraction center strips have been staked in positionupon the sub-grade, as described, concrete is deposited upon the sub-grade on opposite sides of the center strip to completely embed the same, but leaving the rounded upper portion of the top beads exposed to project a slight distance above the top level of the road section 2. The concrete .which has been poured is permitted to set to a required degree, after which a deflecting or indenting machine or roller device is engaged with the top head 15 and is rolled over the same to indent or deflect the same downwardly within itself, as indicated in Figure 4, to form the the level of the top bead and formlng a center fgroove in the road section 2, which may be lled with pitch, or other suitable material, 20, as clearly illustrated in Figure 4.

The pitch 20 is usually not poured to fill the center groove until after the concrete which forms the main body section 2 of the road has been allowed to set sufliciently to permit the sections of the road on opposite sides of the center strip to gradually move outwardly away from the opposite sides of said strip to form the required split in the road. After the center groove and a splitting of the road have been completed, pitch or other suitable material is adapted to be filled into the groove from, time to time to provide the customary dark center line for the completed road.

In order to permit the top bead 15 tobe conveniently deflected inwardly or indented, as illustrated in Figure 4, the weakened side sections of said bead are provided by slotting the sides of the bead or otherwise forming the same to permit the top of the bead to he readily deflected or bent inwardly within the lower half of said head? It will, of course, be understood that many groove 19, thereby lowering changes may be made and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and it Is, therefore, not purposed to limit the patent granted hereon otherwise than necessitated by the scope of the appended claims.

I claim as my invention:

1. A concrete road contraction center strip comprising a corrugated body strip, a base bead integrally formed on the lower longitudinal margin thereof, and a weakened top bead integrally formed on the top longitudinal margin of the body strip and adapted to be deflected after the contraction center strip has been embedded in concrete.

2. A concrete road contraction center strip comprising a reinforced body strip, an upwardly directed base bead integrally formed on the lower longitudinal margin of the body strip, and a top bead integrally formed on the top longitudinal margin of the body strip and adapted to be deflected after the concrete has been poured to embed the centerstrip, to form a center groove in the road.

3. A contraction center strip comprisin a reinforced corrugated body section, an a weakened deflectable head on one of the longitudinal margins thereof.

4. A concrete road contraction center strip flectable bead formed on the upper longitudinal marginof the body strip and adapted to be deflected after the contraction center strip is embedded in concrete to form a center groove in the concrete.

6. A concrete road contraction center strip comprising a plurality of sections disposed in angular connected relation and having reinforcing beads formed at the angular junctions of the sections forming the contraction center strip, and means on said strip adapted to be deflected to provide a groove for the formation of a road center line.

7. 'A concrete road contraction center strip comprising a plurality of corrugated body sections disposed at angles with respect to one another, reinforcing beads provided at the angular junctions of the body sections, a base bead opening upwardly and formed on the strip having restrip, and a hollow delower longitudinal margin of the body strip,

and a weakened deflectable top bead inte-' grally formed on the top longitudinal margin of the body stri p 8. The comblnation with a contraction center strip of a bead integrally formed on one of the margins thereof and eventually adapted to be deflected to provide a groove integrally formed along the lower longi-- therein.

9. A concrete road contraction center strip comprising a corrugated body section having enlarged reinforcing beads formed therein, an upwardly opening foot bead integrally formed on one longitudinal margin of the center strip and extending from one end of the center strip to within a short distance of the opposite end of said center strip, and a weakened bead integrally formed on the other longitudinal margin of the center strip and extending from one end of said center stri to within a'short distance of the opposite en thereof.

I 10. A concrete road contraction center strip comprising a reinforced corrugated body section having apertures therein for the reception of retaining stakes, a rounded base bead tudinal edge of the body strip and having an upwardly directed outwardly curved flange forming a part thereof, and a closed weakened bead integrally formed on the top longitudinal margin of the body strip and adapted to be deflected after the contraction center strip has been embedded in concrete to proyide a center groove in the concrete.

11. A concrete road. contraction center strip comprising a bent corrugated body section having enlarged reinforcmg beads along the lines of bend, a rounded open base bead integrally formed on one longitudinal margin of the body section, a closed weakened bead integrally formed on the upper longitudinal margin of thebody strip, and a tapered extension integrally formed at one end of the body strip adapted to be moved into interfitting engagement with an adjacent contractioncenter strip to lock the center strips to-- gether; 12. A concrete road contraction center strip comprising a corrugated body section having apertures therein for the reception of retaining stakes, enlarged reinforcing beads formed in the body section, an open foot bead integrally formed on one longltudinal'margin of the body section, a weakened closed bead integrally formed on the opposite longitudinal margin ofthe body section,

strip comprising an upper corrugated secformed on the upper section, and means formed on one end of the contraction center strip to permit the same to interfit an adjacent contraction center strip.

15. A concrete road contraction center strip comprising an apertured corrugated body section, a base bead integrally formed thereon and extending from one end of the body section to within a short distance of the opposite end thereof, and a weakened deflectable bead integrally formed on the body section and extending from one end thereof to within a short distance of the opposite end and adapted to be indented after the contraction centerstrip has been embeddedin concrete, to provide a groove in the concrete.

16. The combination with a concrete road contraction center strip, of means integrally formed thereon adapted to be deflected after the contraction center strip has been embedded in concrete to provide a groove in the concrete for the reception of a material forming the-center line of the road.

17. A concrete road contraction center strip comprising a reinforced apertured body section, and a bead integrally formed thereon having slots therein to weaken the bead to permit the same to be deflected inwardly within itself to form a groove for the formation of a road center line.

In testimony whereof I have hereunto subscribed my name at Chicago, Cook County,

Illinois.

ROBERT R. ROBERTSON.

and a tapered extension on one end of the body section to facilitate alignment of the body section terstrip. 4

13. A concrete road contraction center with another contraction censtrip comprising abent corrugated body section, enlarged reinforcing beads" formed along thelines of bend of the body section, and a tapered extension on one end of the body section tofacilitate mounting of the same in alignment with an adjacent contraction center strip. Y

14. A concrete road contraction center