GB2140840A - Roofing tiles - Google Patents

Abstract

A concave tile 4 has two opposing curve sides 41, 42 and two opposing straight sides one of the straight side 43 being provided with teeth like engaging protrusions 431 and another straight side being provided with an extended portion which is curved to form a channel 45, engaging ridges 46 being provided near one of the curve sides 41. At the bottom side of the tile is provided a groove 48 for engaging with the engaging ridges 46 when two tiles are overlapped one another. A convex tile 5 used at the edge junctions between adjacent concave tiles is comprised of a channel 52 member of segment like cross section and a contracted portion 53 extended from one end of the channel, another end of the channel capable of being lapped over the contracted portion 53 of another convex tile when two convex tiles 5 are joined together. A wire 6 passing through holes 47 may engage with mortar laying in the overlap between tiles. <IMAGE>

Description

SPECIFICATION Roofing tiles This invention relates to roofing tiles, particularly to glazed tiles for roofing palace like building, Chinese traditional building, temple etc.

It is known that there is a tile roofing system in which a piece of convex tile 2 is adhered to where two pieces of concave tiles 1 are jointed together by means of a cement mortar as shown in Fig. 1. In such kind of roofing tiles, after a period (about three or four years) the adhesion between the concave and convex tiles is lost due to the wear of the concrete by exposure to the weather. As this type of roofing tiles is generally glazed and used for the roofs of palace like building, Chinese style arbor, temple etc., which have highly inclined roofs, the failure of the concrete may easily lead to the disintegration of pieces of tiles. This is due to the imperfect structure of the tiles which incurs imperfect coupling of the convex and concave tiles.

Furthermore, the cement mortar therefor is requied in a considerable amount so as to enable to fill the space between the convex and concave tiles.

In roofing such building, it must be in conformity with Chinese traditional specification. Sometimes, two pieces of concave tiles have to be slightly spaced apart to meet the specification. In such case, the cement mortar is often dropped into the clearance between the tiles, thereby increasing the consumption of the cement mortar. As the construction and arrangement of such tiles can not allow good ventilation, the roof constructed thereby is not easily dried after moistened, and even sometimes will cause leakage of water.

According to the invention, a concave roofing tile is comprised of a four-sided concave member having two opposing sides and two opposing straight sides, a portion of one of the straight sides, with a length from one of the curve sides to a point spaced apart in some extent from another curve side, is extended upward and curved to form a channel.

Engaging ridges are provided on the top side of the member within a region between another curve side and a line passing through the point and parallel to another curve side.

Groove means engageable with the engaging ridges are provided at the bottom side of the member near one curve side. Teeth like engaging protrusions are provided on the top side of the member along another straight side. Advantageously, the engaging ridge means is parallel to the curve side.

According to the invention, the convex tile used in combination with the above concave tile is comprised of a channel member of segment like cross section having its height slightly and gradually decreased from one end to another end thereof, and a contracted portion extended from the higher end of the channel. The contracted portion has a cross section in the shape of a segment.

An object of the invention is to provide improved concave and convex glazed tiles which can be coupld with the cement mortar with better adhering manner.

Another object of the invention is to provide a concave glazed tile which can be laid with the other with more stable and effective engagement.

Another object of the invention is to provide a concave glazed tile and a convex glazed tile which can be coupled together with more effective engagement and arrangement.

These and other objects, features and advantages of the present invention will be more apparent in the following description of a preferred embodiment with reference to the accompanying drawing, in which: Figure 1 shows an arrangement of concave and convex tiles in the prior art: Figure 2 is a perspective view of a concave tile constructed according to the invention; Figure 3 is a perspective view of the concave tile in another position; Figure 4 is a perspective view of a convex tile constructed according to the invention; Figure 5 is a sectioned view taken along the line V-V' of Fig. 4; Figure 6 is a bottom view of the convex tile; Figure 7 illustrates the arrangement of the concave and convex tiles for roofing; Figure 8 illustrates the cementing of the concave tile to the roof; Figure 9 is a sectioned view taken along the line IX-IX' of Fig. 7; and Figure 10 illustrates the arrangement of the concave and convex tiles in which two concave tiles are slightly spaced apart.

Referring to Figs. 2 and 3, there is shown a four-sided concave roofing tile 4 having two opposing curve sides 41 and 42 and two opposing straight sides 43 and 44. Adjacent to the side 43 are provided teeth like protrusions 431. A portion of the side 44 is extended upward and curved to form a channel 45 of reverse U-shape, the channel 45 being slightly and gradually decreased in height from one side 453 to another end 452. On the surface of the channel 45 are provided with grooves 451.

There is further provided engaging ridges 46 parallel to the side 41. Between the ridges 46 are provided two openings 47 for insertion of a bent wire 6. At the bottom side of the tile 4 is provided a recess 48 which can receive the engaging ridges 46. Protrusions 49 are further provided at the bottom side of the tile 4.

Referring to Figs. 4, 5 and -6, there is shown a convex roofing tile 5 which is used in combination with the tile 4. The tile 5 is in the form of a channel 52 having a shape of segment in its cross-section. The height of the channel 52 is slightly and gradually decreased from one end to another end. A contracted portion 53 is extended from the higher end of the channel 52 and an engaging recess 51 is provided at the bottom portion of the channel 52. Inside the channel 52 are provided parallel grooves 54.

Referring to Figs. 7, 8 and 9, there is shown an examplary arrangement of tiles 4 and 5 in which four pieces of tiles 4 are laid together in overlapping positions and two pieces of tiles 5 are superimposed respectively on the channel 45 of tiles 4. The bottom sides of the tiles 4 are adhered to the roof 7 by providing a cement mortar therebetween.

For better fixedness, wire rods 6 are bent and penetrated through openings 47 of the tiles 4 respectively into the cement mortar. The protrusion 49 gives better stability for positioning tiles 4. In arrangement, each tile 4 is inclined with its side 41 being upper and its side 42 being lower, and lapped over the other which is placed lower, the recess 48 being in engagement with the engaging ridge means 46.

The channel 45 of the tile 4 is lapped over and engaged with the engaging protrusions 431 of the other tile 4 which is placed side by side therewith. As the channel 45 has a gradually increasing height, it can be in the same height alignment with other channel 45 which is extended thereover. Each tile 5 is lapped over the contracted portion 53 of other tile 5 and is cemented with the surface of the channel 45 by means of the cement mortar 8 as better seen in Fig. 9. Grooves 451 of the channel 45 and grooves 54 of the convex tile 5 are in engagement with the cement mortar, thereby obtaining further cementing effect between the channel 45 and the convex tile 5.

However, instead of grooves 451 and grooves 54, other engaging means, such as projections and ridges which can provide the same effect are also suitable to be provided in the channel 45 and the convex tile 5.

Referring to Fig. 10, there is shown an arrangement of the concave and convex tile in which two side by side disposed tiles 4 are spaced slightly apart. As the cement mortar is provided between the channel 45 and the convex tiles 5 it will not be dropped into the clearance between two tiles 4. In addition, due to the presence of the channel 45 good ventilation can be achieved.

With the invention thus explained, it is apparent that obvious modifications and variations can be made without departing from. the scope of the invention. It is therefore intended that the invention be limited only as indicated in the appended claims.

Claims (6)

1. In combined concave and convex roofing tiles a concave roofing tile comprising, a four-sided concave member having two opposing curve sides and two opposing straight sides, a portion of one of said straight sides, with a length from one of said curve side to a point spaced apart in some extent from another said curve side, extended upward and curved to form a channel, engaging ridge means provided on the top side of said member within a region between another said curve side and a line passing through said point and parallel to another said curve side, groove means engageable with said engaging ridge means provided at the bottom side of said member near said, one curve side; and teeth like engaging protrusions provided on the top side of said member along another said straight side.

2. A concave roofing tile according to Claim 1, wherein said engaging ridge means is parallel to said another curve side.

3. A concave roofing tile according to Claim 2, wherein said channel is provided with engaging grooves on the surface thereof.

4. In combined concave and convex roofing tiles a convex roofing tile comprising, a channel member of segment like cross section having its height slightly and gradually decreased from one end to another end thereof, and a contracted portion extended from the higher end of said channel, said contracted portion having a cross section in the shape of a segment.

5. A convex tile as substantially described hereinbefore with reference to the accompanying drawings.

6. A concave tile as substantially described hereinbefore with reference to the accompanying drawings.