US1316345A - Rtjdderpost of steel-concrete vessels - Google Patents

Description

H. ALFSEN. RUDDERPOST OF STEEL CONCRETE VESS ELS.

APPLICATION FILED JULY 31.1918- Patented Sept. 16, 1919.

Fig. 2.

Tm: COLUMBiA PLYANOGRAPH 50.. WASHINGTON D c UNITED STATES PATENT onnron.

HAIR-ALB ALFSEN, 0F PORSGRUND, NORWAY, ASSIGNOR TO JOHN MfiLLER LARSEN, OF CHICAGO, ILLINOIS.

RUDDERPOST 0F STEEL-CONCRETE VESSELS.

Specification of Letters Patent.

Patented Sept. 16, 1919.

To all whom it may concern:

Be it known that I, HARALD ALFsEN, a subject of the King of Norway, of Porsgrund, Norway, have invented certain new and useful Improvements in Rudderposts of Steel-Concrete Vessels; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

The present invention relates to an improvement in the rudder posts of reinforced concrete vessels and has for its object to enable the said rudder post to be easily changed in case of breakage or when a change of rudder post may be desirable for other reasons, for instance owing to corrosion or the like.

For this purpose the exterior parts of the rudder post are fastened to the parts embedded into the body of the vessel, in a manner which enables the exterior parts of the vessel to be changed without detriment to the casting. The fastening may be performed by rivets, screws or by other suitable means.

A form of the invention is illustrated on the drawing.

Figure 1 is a longitudinal section through the stern of a reinforced concrete vessel, showing the rudder post.

Figs. 2, 3 and 4 are cross sections on the lines A-B, CD and EF of Fig. 1.

As it is seen on Fig. 1 the rudder post consists of the parts 1 and 2, which are cast into the hull of the vessel, and the part 3 which is outside the hull. This part as seen on Figs. 2 and 3 is fastened to the embedded parts by means of bolts or rivets 4, so that it may be removed or changed without removing the embedded parts 2' and 3. In order that a large stress, such as a shock or the like shall not be liable to loosen parts 1 and 2, the part 3 is so constructed that a bregkazge will take place on the lines w-a or The parts of the rudder post embedded in the hull of the ship are covered as far as possible by concrete, so that no corrosion of these parts has to be feared, and the said parts are also anchored in the best possible manner into the steel concrete hull.

Claims:

1. In a rudder-post for concrete vessels and the like, one or more members embedded into the concrete hull of the ship, and a member connected to the first named members outside the embedded portion and so constructed that it will break under excessive stresses or shocks at a point outside the connection thereby preventlng exposure of said embedded members to dangerous shocks or stresses.

2. In a rudder post for reinforced concrete vessels and the like one or more members embedded into the concrete hull of the ship and one member fastened to the said first members in such a manner that it may be removed or changed without moving the parts embedded in the concrete, said free part of the rudder post being so constructed, that in case of large stresses or shocks it is liable to break at a point outside the connection with the embedded members with the object of preventing exposure of said members to dangerous shocks or stresses.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

HARALD ALFSEN.

Witnesses Moenus Boson, THOMAS HERZ.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.

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