CA2083215A1 - Compound pavement stone - Google Patents

Abstract

Abstract of the Disclosure The side surfaces of the compound stones are pro-vided with relatively flat joggle elements which in-terlock with little play when said stones are laid out, while adjoining side surfaces of neighboring stones are in contact along two lines only. A com-promise between a sufficient mutual securement of the stones and a certain mutual mobility thereof is thus obtained, in particular a certain tilting of neighbor-ing stones with respect to each other, whereby it is possible to produce uneven places in pavements.

(Fig. 2)

Description

r - :

COMPOUND PAVEMENT STONE :

BACKGROUND OF THE INVEN'rION

The present invention refers to a compound pave-ment stone having complementally shaped joggle ele-ments on opposite side surfaces. Different embodi-ments of such composite stones are known, said joggle elements generally being formed in such a manner that they interlock substantially without any clearance when the pavement is laid out in order to prevent any mutual displacement of said stones. Also, in this -~
case, the joints between neighboring stones are so narrow that they do not have to be filled up with sand. On the other hand, compound stones are known which have joggle elements which interlock without any play but whose surfaces are at a certain distance from each other when the compound pavement is laid out.
Likewise, a mutual displacement of the stones is sub-stantially excluded, but they have to be filled up with sand, moreover.

SUMMARY OF THE INVENTION

It is the object of the present invention to pro- `~
vide a compound pavement stone having complemental joggle elements, said stone representing a compromise in so far as a mutual displacement of the stones is substantially prevented and filling up with sand is --unnecessary while a certain mutual mobility of the stones, in y`articular a slight mutual tilting, is pos- -~
sible, however. This object is attained by means of a compound pavement stone having complementally shaped joggle elements wherein said joggle elements interlock ~-;

(DM/as 16.11.92) `

with a clearance and thereby allow a mutual tilting of neighboring stones. According to another embodiment, said complemental joggle elements interlock with little clearance or are in line contact with each other. Particular embodiments are defined in the de-pendent claims.

SHORT DESCRIPTION OF THE DRAWINGS

The invention is described in more detail hereinafter with reference to an example of an embodi-ment which is illustrated in the drawing.

Fig. 1 shows a spatial representation of a stone;
I

Fig. 2 shows a section of a pavement; and Fig. 3 shows a side view of a part of the pave-ment. ~ -DETAILED DESCRIPTION OF THE INVENTION -..;, :
Compound stone 1 shown in Fig. 1 has an essen-tially square shape with four equally formed lateral surfaces having cyclically recurrent joggle elements and surface portions, respectively. Each lateral sur-face is provided with a locking tooth 2 having a rela-tively steep flank 2a and a less steep flank 2b. The ;
steep flank 2a of the locking tooth 2 is followed by a tooth space 3 having a plane bottom. Adjacent said tooth spac~ 3, there is a convex surface portion 4 whose profile has a regular curvature or circularshape. The flat flank 2b of tooth 2 is followed by a concave surface portion havin~ slightly vaulted flanks (DM/as 16.11.92) - : . ~ : : , ~ , . . .. .

and a flat central por-tion 5. The corners of the stone are in the form of teeth 6 having relatively weakly inclined flanks. As mentioned, parts 2 to 5 recur on all four sides of the stone in a cyclic man-ner.

As shown in Fig. 2, in addition to square stones 1 according to Fig. 1, rectangular stones 7 may be provided. On their short sides, said rectangular stones are formed as the square stones, and on the long sides, the same group of joggle elements is repeated twice in succession. Fig. 2 illustrates how adjoining stones interlock with little play, only the respective convex surface portions 4 and the flat cen-tral portions 5 being in contact along a line, thus positively determining the mutual distance of the stones, while the locking teeth 2 engage in spaces 3 with some play. Even the position of the edge s-tones, which abut on a bordering indicated by line 8 in Fig.

2, is positively determined by the contact of two apexes of the side surfaces, i.e. locking tooth 2 and corner tooth 6 adjacent concave surface portion 5. In spite of the reduced play between locking teeth 2 and tooth spaces 3, the stones are sufficiently secured against any mutual displacement or twisting. Due to the existing play and the line contact between neigh-boring stones, however, a certain mobility is main~
tained; in particular, individual stones may be slightly tilted with respect to the neighboring stones, as indicated in Fig. 3. The mentioned play between nelghboring, laid-out stones may be about 1 mm, for example, while the level difference between the highest and the lowest portions of the side sur-faces may be e.g. about 4 mm. The mentioned ~obility (DM/as 16.11.92) of the stones allows to lay out pavements over uneven places, e.g. at the junction of a horizontal courtyard and an inclined garage driveway.

In addition to the illustrated stones, stones of other shapes and sizes may be provided, e.g. square stones with double or triple side lengths, angle stones or S-shaped stones, as long as the side sur-faces have at least one group of ~oggle elements 2 to 5 each.

~ ~ ~

(DM/as 16.11.92) ~ ' : : :

Claims (10)

1. A compound pavement stone having complemen-tally shaped joggle elements, wherein said joggle ele-ments interlock with a clearance and thereby allow a mutual tilting of neighboring stones.

2. The compound pavement stone of claim 1, wherein said complemental joggle elements interlock with little clearance or are in line contact with each other.

3. The compound pavement stone of claim 1, wherein each side surface is provided with at least one tooth and one space intended for receiving said tooth.

4. The compound pavement stone of claim 3, wherein said space is wider than said tooth.

5. The compound pavement stone of claim 3, wherein the head surface of said tooth and the bottom of said space are at least approximately flat.

6. The compound pavement stone of claim 1, wherein a group of joggle elements is formed at least once on each side surface, said group comprising a convex, vaulted portion, a recessed portion or space, a tooth, and a concave portion in sequence.

7. The compound pavement stone of claim 6, wherein said convex, vaulted portion has a regularly curved, e.g. a circular profile, while said concave portion has a flat central portion.

8. The compound stone of claim 6, wherein the edges are in the form of a tooth between a convex and a concave portion.

9. The compound stone of claim 3, wherein said tooth is provided with flanks of different steepness.

10. The compound stone of claim 9, wherein the steeper one of said tooth flanks is adjacent to said space.