|Publication number||US3722162 A|
|Publication date||Mar 27, 1973|
|Filing date||Oct 12, 1970|
|Priority date||Oct 10, 1969|
|Also published as||CA924555A, CA924555A1, DE6939758U|
|Publication number||US 3722162 A, US 3722162A, US-A-3722162, US3722162 A, US3722162A|
|Original Assignee||Ludvigsen H|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (7), Referenced by (7), Classifications (16)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent 1191 Ludvigsen' 1 Mar. 27, 1973  TESSELATION OR PAVING ELEMENT 30 Foreign Application Priority Data Hans Thorkil Ludvigsen, Fjellebro,-
 ABSTRACT Tesselation or paving element or tile comprising an underpart having two by two symmetrical side surfaces, of which one pair is converging and the other diverging in the direction of the upper surface, said part carrying at its upper surface a prism, the base of which is' congruentwith the upper surface, wherein said prismatic part makes up at least one-third, preferably more than half of the height of the element in order to improve the mutual interlocking in directions perpendicular to the surface of the paving as well as making the joints impenetrable for loose underlayer.
'Tesselation of paving element or tile having parallel upper surfaces and bottom faces and oblique, two by two, symmetrical side surfaces, of which at least one pair is converging in the upper surface and at least another pair in the bottom face, are known. Thus,
' these bodies make up shortened cross prisms, the axis of which is parallel with the upper surface and the bottom face.
' respondingto or smaller than the surface in question,
said base having such a form that the elements when joined may form a continuous surface. By these known elements the height of the prism in question is small in comparison with that of the cross prism.
3 Claims, 4 Drawing Figures Oct. 13, 1969 Germany ..G 69 39 758.6
52] US. CL. ..52/608, 94/13  Int; Cl. ..E04b 2/00, E041) 1/24, EOIC 5/00  Field of Search ..52/608-611, 575, 52/590, 572, 573, 415; 94/13 ' References Cited I UNITED STATES PATENTS 1,417,010 5 1922 Wright et 1 ..94/13 194,250 8/1877 Krackowizer etal ..52/575 621,100 3/1899 Knowles .i.....52/61 1 FOREIGN PATENTS OR APPLICATIONS 76,252 12/1947 Czechoslovakia... ..'...52/4l5 29,994 12/1912 Great Britain ..52/608 1,178,186 12/1958 France ..52/590 145,073 2/1931 Switzerland "52/575 P rimafyExamirier Frank L. Abbott Assistant Examiner.l arnes L. Ridgill, Jr. Attorney-Stowell & Stowell PATENTEUmzmza 1 6 '6 i i 4 2 Y i 5 i g 2 1- Fig 4.
,INVENTOIR HANS THORKIL LUDVIGSEN ATTCRNEYS TESSELATION OR PAVING ELEMENT The purpose of the present invention is to improve the tightness of the joints between the elements of the paving or tesselation. According to the invention this has been achieved by forming elements of the kind mentioned above in such a way, that the prismatic part makes up at least one-third, preferably more than half of the height of the element. In addition to thepurpose aimed'at an improved mutual fixing perpendicular to the paved surface is surprisingly obtained when compared with that of the known elements. Furthermore, more even surfaces are obtained with the elements according to the present invention as the elements tend to level during use.
The elements according to the invention may be used advantageously in the covering of-a loose underlayer, f.ex. sand, and may for instance be used for the securing of shores or of river-banks or as revetments on dikes. Due to the improved mutual interlocking effect the pavement can be used on softly curved surfaces, and the pavement is able to take up local settings in the underlayer.
For these purposes the base of the prismatic part of the element may be square, and the length of-the side lines in the upper surfaces and the bottom face may be considerable when compared with the height, f.ex. by square elements two or more times the depth, thus making the element tile-shaped.
In the drawing an embo'diment of the element according to the invention is shown,
FIG. 1 and 2 showing the element seen from the upper surface and the bottom face, respectively, and
FIG. 3 and 4 the element seen from two'sides at right angles to each other.
In the drawing 1 is the upper surface, 2 the bottom face, 3 and 4 the side surfaces of the prismatic part, 5 and 6 the oblique surfaces, of which the surfaces 5 are converging in the upper surface, the surface 6 in the bottom. The upper surface has for ornamental purposes a rounded-off elevation 7. When joined together the tiles are turned around a vertical axis in comparison with the neighboringtiles, in such a way that the oblique surface 5 is always brought into contact with the oblique surface 6 of the neighboring tile.
I claimf 1. Units for use in tesselation, as paving elements, as tiles and the like covering, each of the units consisting of a prism having parallel top and bottom surfaces, the
upper at least one-third portion of each of said units having pairs of symmetrical, parallel side walls the outer surfaces of which are normal to the top and bottom surfaces, and the lower remaining portion of said unit consisting of oblique in pairs of symmetrical planar side walls of which at least one pair of the oblique planar side walls is converging from the bottom surface and at least the other pair of the oblique planar side walls is diverging from the bottom surface, said units being assembled with the upper at least one-third portion of the side walls of adjacent said units in closely spaced parallel relationship.
2. The invention defined in claim 1 wherein the upper portion of each unit exceeds half of the total height of the unit.
3. The invention defined in claim 1 wherein thetop and bottom surfaces of each unit are square.-
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US194250 *||Jun 14, 1877||Aug 14, 1877||Improvement in building-blocks|
|US621100 *||Dec 1, 1898||Mar 14, 1899||Wiltxur w|
|US1417010 *||Aug 6, 1921||May 23, 1922||Wesley Wright Charles||Paving block|
|CH145073A *||Title not available|
|CS76252A *||Title not available|
|FR1178186A *||Title not available|
|GB191229994A *||Title not available|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5051023 *||Jan 3, 1991||Sep 24, 1991||Chichibu Cement Co., Ltd.||Fracture-free layered paving blocks|
|US5332191 *||Oct 26, 1992||Jul 26, 1994||Nolan Terry L||Apparatus for making concrete slabs|
|US6471440 *||Aug 12, 1999||Oct 29, 2002||Rolf Scheiwiller||Paving stone|
|US6939077 *||Jun 10, 1999||Sep 6, 2005||Formpave Holdings Limited||Paving block|
|US8231304 *||Sep 18, 2008||Jul 31, 2012||Les Materiaux De Construction Oldcastle Canada, Inc.||Artificial flagstone|
|US20040088929 *||Sep 23, 2003||May 13, 2004||Keystone Retaining Wall Systems, Inc.||Landscaping block|
|US20090155497 *||Sep 18, 2008||Jun 18, 2009||Les Materiaux De Construction Oldcastle Canada, Inc.||Artificial flagstone|
|U.S. Classification||52/608, 404/41|
|International Classification||E04F13/14, E04F15/08, E02B3/14, E01C5/00, E01C5/06|
|Cooperative Classification||E04F15/08, E04F13/14, E01C5/00, E02B3/14, E01C2201/12|
|European Classification||E04F15/08, E01C5/00, E02B3/14, E04F13/14|