Ships – Fenders – Roller
Patent
1982-03-03
1983-09-27
Blix, Trygve M.
Ships
Fenders
Roller
B63B 5902
Patent
active
044062419
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a device for absorbing friction between ships' hulls and the quay walls of harbours. This type of device is also called a quay fender.
Various types of quay fender are known.
The fender which is closest to the one to which the present invention relates comprises a series of worn pneumatic tires disposed against one another on a wooden beam which is positioned horizontally with respect to the quay wall.
In the working position, the tires rest against the vertical side of the quay wall. They are clamped at the ends of the beam by means of wooden components secured in a perpendicular manner to the beam.
These fenders are unsatisfactory, mainly for the following reasons:
On the one hand, the wood of the beam is quickly damaged by sea-water, so that the fender must be replaced at the end of a relatively short period. In addition, the use of wood is quite unsuitable for utilisation of the fender in a fully submerged state.
Because of this, such a fender is unsuitable for protection of the submerged bulge at the bow of a ship, which is usually called "the bulb".
Moreover, it is virtually impossible to achieve close and uniform contact between the tires and the outer surface of the wooden beam, so that the tires tend to be displaced on the beam with respect to one another, giving rise to rubbing which causes rapid deterioration of the fender.
On the other hand, since it is impossible to ensure water-tightness between the interiors of the tyres and the surface of the wooden beam, the tires cannot easily be filled with a material capable of giving the fender the desired shock-absorbing effect. It is an object of the present invention to overcome the above disadvantages by providing a fender which is simultaneously reliable, effective and inexpensive.
The device to which the invention relates, for absorbing friction between ships and quay walls, comprises a series of worn pneumatic tires disposed against one another on an elongate body intended to be positioned substantially horizontally with respect to the quay wall.
According to the invention, the device is characterised in that the elongate body consists of a cylindrical metal tube filled with concrete lightened by low density fillers, that the worn pneumatic tires are filled with a low density elastic material, that the parts of the pneumatic tires adjacent to the metal tube are closed off in a water-tight manner by flexible sleeves in contact with the metal tube and that the tube is closed off at its ends by means of plates which project with respect to the outer surface of the tube, these projections holding the assembly of tires pressed against one another.
The use of a cylindrical tube allows perfect contact to be obtained between the tires and the outer surface of the tube. This perfect contact, combined with the fact that the tires are presed against one another between the tube end plates, prevents any harmful displacement and rubbing of the pneumatic tires, liable to shorten the life span of the fender.
Moreover, because it is possible for very good contact to be achieved between the pneumatic tires and the outer surface of the tube, it is possible to obtain very good water-tightness between this surface and the interiors of the pneumatic tires. The pneumatic tires can therefore be filled with a suitable material so that the desired shockabsorbing effect can be obtained.
In addition, the fact that the cylindrical tube is filled with light concrete not only makes this tube rigid, which is essential so that perfect contact can be maintained between the pneumatic tires and the tube, but also allows the fender to be adapted to the desired buoyancy conditions.
According to an advantageous embodiment of the invention, the metal tube is filled with concrete comprising particles of a material selected from the following group: pumice, expanded polystyrene, rubber chips, balls of expanded glass.
According to a preferred embodiment of the invention, the pneumatic tyres are filled with rubber shavings or powder, also coming from worn p
REFERENCES:
patent: 2413210 (1946-12-01), Blackman
patent: 2562957 (1951-08-01), Sipken et al.
patent: 2680859 (1954-06-01), Hultberg
patent: 2952979 (1960-09-01), Rolando
patent: 3455269 (1969-07-01), Dean
patent: 3724413 (1973-04-01), Duncan et al.
patent: 3848853 (1974-11-01), Way et al.
patent: 3951384 (1976-04-01), Hildreth, Jr.
patent: 4055136 (1977-10-01), Fujisawa et al.
Blix Trygve M.
Sotelo Jesus D.
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