More specifically, the invention relates to replaceable seals for sliding doors used in particular on board ships and rigs, and to be absolutely specific, the invention relates to such replaceable seals in connection with doors capable of functioning both as AO fire doors and as watertight sliding doors.

NO 151 477-B describes watertight sliding doors where sealing strips are arranged between the peripheral portion of the door and the door frame.

The door and sealing strips described in this patent are intended for use on board ships and offshore platforms where there are a number of openings which it must be possible to close in a watertight manner, for example, haches, ports and so on.

In order to ensure a satisfactory watertightness around the peripheral portion of the door, the sealing strips must be compressed once the door has been closed, and this is achieved according to the patent by a Y-section with accompanying lip seals.

Recently, it has become a requirement that watertight doors of the type described in NO 151 477-B must also be fire-resistant.

In addition, it has been found that there is a need to be able to change the seals in a simple, fast and inexpensive manner when damage occurs.

It is an objective of the present invention to solve the problems indicated above and to satisfy market requirements by means of a further development and improvement of the technology described in NO 151 477.

Thus, the present invention relates to replaceable seals mounted on the outside of a Y- shaped support provided on the periphery of a door leaf, for watertight and fire-resistant sliding doors, in particular for use on board ships and rigs, and these seals are characterised in that they are roughly trapeziform in shape, wherein

-the short long side forms a surface of contact against one of the arms of the Y- shaped support; -the first short side forms a surface of contact against the upright of the Y; -the long long side forms a surface of contact against fastening means, preferably in the form of a washer with nuts and bolts; and -the second short side forms the sealing surface of the seal against a door frame.

According to a preferred embodiment of the inventive subject, the replaceable seals are made of a rubber-elastic, watertight and AO fire-resistant material.

The invention will now be described in more detail with reference to the attached figure.

A door leaf whose periphery is equipped with the inventive seal is indicated by means of the reference numeral 14.

A Y-shaped support 12 is welded in place along the periphery of the door leaf 14.

The arms of the Y arms are equipped with holes for fastening devices for the replaceable seals, as will be described below.

The inventive replaceable seal is indicated by means of the reference numeral 10.

It is generally trapeziform in shape and the faces have the following functions: The short side 15 of the two parallel or substantially parallel faces is intended to lie against the outer side of the arm of the Y-shaped support 12.

The first 16 of the non-parallel faces of the trapezium 2 is intended to lie against the respective side of the upright of the Y-shaped support.

The long side 17 of the two parallel or substantially parallel faces comes to lie, in the illustrated embodiment, against a washer 11 which, with the aid of a nut 19 on a threaded bolt 13, serves to secure the seal.

The last 18 of the faces of the trapezium is so designed as to lie against the surface with which the watertightness or fire-resistance is to be obtained.

Each Y-shaped support supports two replaceable seals of a symmetrically identical type on each outer side of the Y-shaped support.

In the event of water pressure on one or the other side of the seal arrangement as shown in the figure, in principle parallel with the plane of the door leaf 14, the free part, indicated by means of the reference numeral 20 in the figure, will be pressed progressively harder against the surface against which it is sealed and on increasing pressure an ever-greater area of the face 18 will be pressed against the opposite surface and thus provide an increasingly stronger seal.

In cases of fire, a seal of the type outlined above will be charred on the exposed side, thereby forming insulation between the door leaf 14 and the opposite door frame, and where the protection is sufficiently good to satisfy fire class AO standards.

The inventive seal system permits variations not possible hitherto, for equipping, by use of a standard design, sliding doors with seals of different types according to the requirements which must be met, since the seals are standardised and replaceable and can be changed using simple mechanical aids and with the use of a retaining washer 11, bolts 13 and nuts 19.

In addition to the differences in quality in each individual category, the purpose of Y- shaped support 12 according to the invention is to support seals which are both watertight and AO fire-resistant and which therefore in a simple manner combine essential features and meet requirements laid down in part in the existing regulations.