The invention concerns a hinge between bone and crown of sunshades having a diameter larger than 2,5 meter. For this purpose is used an attachment that is fastened to the bone. The notches in this attachment cooperate with cams of the crown which form together a hinge. With well-known sunshades a galvanised wire is taken through holes in the bones. The bones are with the wire put around the crown and then the ends of the wire are turned around each other. The wire is in this way a turn-around shaft. This construction is unsuitable for larger sunshades. The use of pins as axis has as consequence that the crown enlarges which cause a disproportionate increase of the circumference of the folded sunshade.

The invention provides for a hinge which reduces the diameter of the crown without doing concessions to the strength of the construction. For this purpose a attachment is developed that contains the elements of the hinge and to fasten reliable to the bone.

The invention will be explained with the help of the drawing.

Fig. 1 shows schematic the sunshade.

Fig. 2 shows the crown with pivoting part and bone. Fig. 3 shows a larger version of Fig. 2.

Fig. 4 shows the pivoting part with a tubular bone.

Fig. 5 shows the construction with the crown.

Fig. 6 shows a cross-section through the pivoting part.

Fig. 7 shows a cross-section 7-7 through pivoting part.

Fig. 1 shows schematic the sunshade with the foot (1), column (2), The bones <3) and the bone supports (4). At (5) and (6) is a crown which carry pivoting members with bones (3) and bone supports (4).

In Fig. 2 the crown is indicated with (7). In crown (7) are notches ⁽ 6). At the inside αf notch (8) cams <9> are made which face each other. The cams are circular with two flats opposite to each other. In the notch (8) fits a pivoting part (10). This pivoting part (10) is foreseen of of circular notches (11) which are foreseen of slits.

Pivoting parts (10) are having a bore (12) to take up bone (3). Bore

(12) reaches further than the centre of notch (11). Bone (3) is fixed with pin (13). In crown (7) is an opening (14) for the passage of column (2). At (5) is crown (7) permanent fixed with column (2) while at (6) the crown (7) is movable along column (2) to permit the folding up of the sunshade.

In Fig. 3 is indicated a version of a larger type where bones (3) consists of thin-walled metal tube which is connected with a snapping fastener (15) to pivoting part (10). Fig. 4 shows bone (3) with pivoting part (10) in the position to carry out the assemblage with crown (7). In Fig. 5 is bone (3) shown in folded position.

It is found that by using a deep bore (12) in pivoting part (10) a very solid construction is realised because notch (11) cannot bend away. The construction is very favourable for using die-casting, in plastic or metal. Especially at the assemblage of large sunshades the hinge is easy to put together and to handle.