US2033028A

US2033028A - Pavement curb

Info

Publication number: US2033028A
Application number: US750271A
Authority: US
Inventors: Gaisman Lucien
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-06-24
Filing date: 1934-10-27
Publication date: 1936-03-03
Anticipated expiration: 1953-03-03

Description

N.B m ww mm. m Lm Filed Oct. 27, 1954 Patented Mar. 3, 1936 "PAVEMENT CURB Lucien Gaisman, .Audensha.w,z Manchester, E land Application"ctober'27, 1934, .SerialNo. "150,271 J InGreat'Britain"June"24,"1933 i: 7-: C aims- Modernroad traffic conditionshave made it firstmoulded'andvulcanized in the required bull- A necessary to provide in certain places, road-curbs "which canbe seen readily-from a'distanceand which offer the maximum visibility in "darkness or in fog, in order. to minimize the possibility of accidents; and which are also so-madeand applied that if an accident should'occunthe nature and construction of the'curb (if involved) will "tend'to reducethe eifects of the accident. Instances of such. places are (a) the islands provided at crossroads in arterial and other roads, and (b) the edges of the adjacent pavements of the crossroads meeting at those or at other .points.

'The object of this invention is to provide pavement curbs possessing'the necessary visibility, resiliency and strength.

According .to the invention, the curb is made up of side-,by-side units each comprising'a-base 'block having on its roadward top corner a rubberocap permanently attached thereto, Ithe cap forming'the outer face of the curb ,ongthe side next the roadway and also beingflush with, and forminga part of, the top face of the pavement; the caps beingyellow, amber, white, or black and yellow, or black and white, or any other suitable colour or combination of colours, to render the curb easily distinguishable.

The base blocks may be of concrete, moulded on to the preformed rubber caps, or may be preformed of concrete, brick or other suitable material, and in all cases the cap will preferably be united to the block by interlocking undercut segmental projections and recesses, some of which will be at the edges and corners.

In the accompanying drawing, which illustrates examples and uses of the invention:-

Fig. 1 is a perspective view of one form of the side-by-side units, and

Fig. 2 is a like view of another form of unit.

Fig. 3 is a perspective view of the cap shown in Fig. 2.

Fig. 4 is a side view, and

Fig. 5 a rear view of the rubber cap shown in Fig. 2.

Fig. 6 is a sectional perspective view of a portion of a pavement curb constructed according to the invention.

In the example illustrated in Figs. 1, 2, 3, 4, and 5, the rubber cap a has an underface b of harder rubber, and anchoring projections 0 also of harder rubber, shaped and arranged as described in United States Patent No. 1,560,174 and British Patents Nos. 198,618 and 211,321, 214,433, 235,938

and 247,009. In making up the unit, the cap is nosev or other required shape of the curb, and such'finished cap is then putinto a moulding box with its hard rubber projections upwards, whereuponconcrete,"to,the required depth, width and 'lengthis cast on toit. The'concrete sets on to the cap, the cap and concrete block thereby being permanently secured together and forming the complete composite unit.

In an alternative method ofmaking up the unit, a preformed concrete block of bull-nose or other required shape,,is first 'made by moulding or casting theconcrete base block onto a flexible rubber negative, and removing the negative after :the'concrete hasset andj'the rubber cap (having an underface ofhard rubberand hard rubber gprojections), is thenvulcanize'd on .to it.

"The unitsmay have onlya slight incline on the :roadwardside, asshown in Fig. 1,, or. may. have ,a rnore pronounced incline as shown in Fig. 2, or .7

may have no incline at all. The. inclined face ,may .meetjthe vertical faceatfthe lower edge of g the cap,..( r,lbelowv or above such edge. Further, the base'block'may extend upwards flush with the cap as shown in Fig. 1, or be recessed as shown in Fig. 2, in which case the pavement will overlie the rear part of the block.

As will be seen from the drawing, the cap on its outer face lies substantially in planes at angles to each other and joined by intermediate curved portions, the interlocking projections may be arranged as segmental undercut units along the edges of each such plane and as intermediate undercut island projections below the said intermediate curved portions.

As shown in Fig. 5, there may be additional interlocking projections on the underface of the cap, in the form of square section ribs in sets arranged at angles to each other, each set comprising a number of parallel ribs.

The rubber cap will preferably have its outer part of yellow, amber, white or like colour, in whole or for the greater part of its area, and usually all the units in a curb will have their caps so coloured, but combinations of colour such as black and yellow or black and white may be employed by differently colouring alternate units or alternate groups of units. The invention however is not limited to the colouring of all the caps, as some of the caps in a curb may, at regular intervals, be of natural rubber colour, say for ornamental eifect so long as the curb as a whole presents the required ease of visibility.

The improved curbs are not necessarily parts of an artificial pavement, but may be arranged along a grass verge or other roadside area.

In some cases the units may be relatively long, similar to all-concrete cur-b blocks now in use, and in such case the expression side-by-side units in this specification and in the following claims must be taken to include an end-to-end arrangement.

Instead of concrete, other mouldable material can be used, or the cap can be vulcanized on to a preformed base of cast iron or other metal. In each case a complete curb unit is obtained, which incorporates a rubber cap, preferably yellow, to the required depth-generally to the road leve1and which rubber on the top surface can be made to extend into the pavement sufiiciently to form a yellow line at the edge of the pavement for the guidance of pedestrians. Strength and anchorage are obtained of such an order that no person can pull the cap away from the base unit, nor will the cap, or unit be disturbed by any ordinary wear and tear of traflic such as glancing blows or direct blows from the wheels of vehicles.

The invention is not limited to any particular form of anchorage, but the anchorage will preferably be such as to resist strains in all directions.

The improved units may be formed with their side faces parallel, or inclined one to the other, according to the required shape (in plan) of the pavement along the edge of which they are to be placed.

What I claim is:

1. A composite unit for making a curb, comprising a rigid block recessed across its whole width at one top corner, the recess extending back from such comer along the top surface of the block and also down one side of the block a distance at least equal to the height of the curb above the roadway, but not to the bottom of the block, such recess being provided with further and segmental undercut recesses along its edges, and some of which are at its corners, and a rubber cap completely filling the recesses to complete the side and top of the block and to form the said corner of the curb.

2. A composite unit for making a curb, according to claim 1, wherein the recess and cap have a pronounced curve at the top corner, and the block has a further undercut recess on the corner, away from the edges, also filled by the cap.

3. A composite unit for making a curb according to claim 1, wherein the floor of the recess, and

the outer face of the cap, each have fiat portions in more than two planes, and wherein there are undercut recesses in the block, filled by the cap, on each of such fiat portions of the larger recess.

4. A composite unit for making a curb, according to claim 1, wherein the floor of the recess, and the outer face of the cap, each have flat portions in more than two planes, and wherein there are undercut recesses in the block, filled by the cap, on each of such fiat portions of the larger recess, and wherein also the recess and cap have a pronounced curve at the top corner, and the block has a further undercut recess on the corner, away from the edges, also filled by the cap.

5. A composite unit according to claim 1, wherein the block has a further and right-angled recess at its rear top corner, into which a pavement slab may fit.

6. A composite unit for making a curb, according to claim 1, wherein the floor of the recess, and the outer face of the cap, each have flat portions in more than two planes, and wherein there are undercut recesses in the block, filled by the cap, on each of such flat portions of the larger recess, and wherein also the recess and cap have a pronounced curve at the top corner, and the block has a further undercut recess on the comer, away from the edges, also filled by the cap, the block also having a further and right-angles recess at its rear top corner, into which a pavement slab may fit.

'7. A composite curb unit according to claim 1 wherein the under face of the cap also has parallel sets of square-section ribs arranged at angles to each other and entering complemental recesses in the block.

LUCIEN GAISMAN.