US1357509A - Ship - Google Patents

Description

R. OGAWA.

Patented Nov. 2, 1920.

2 SHEETS-SHEET I.

R. OGAWA.

SHIP.

Al't'LlCATION FILED OCT. 9. I919.

Patented Nov. 2, 1920.

2 SHEETS-SHEET 2.

anucufog RIOHEI OG'AWjA, 0F TOKYO, JAPAN.

srurl Specification of Jietters Patent.

PatentedNov. 2, 1920.

Application filed-October 9, 1919. Serial-No. 329,579.

T 0 all to 710m it may concern I Be it known that I, Rronnr ()GAWA, subject of the Emperorof Japan residing at No. 22 Tatsuokacho, Hongoku, Tokyo, Japan, have invented certain new and useful Improvements in Ships, of whichthe following is a specification.

This invention relates to improvements 1n ships and more particularly to means for reinforcing the sides of ships hulls.

In building wooden ships and the like, hold beams are employed in the hull for the purpose of reinforcin the interior and spacing the sides apart. lhese hold beams take up considerable space which might be otherwise used for storing the cargo or locating the machinery. I

The object of the present invention 1s to provide a construction by which the hold beams may be dispensed with without affecting the strength of the hull.

To this end, metal plates are arranged on the inner planking of the hull in a-linement with the transverse frames or ribs of the hull, and these plates extend from deck to keel and are bolted in place by bolts which pass through the outer planking, the transverse frames, the inner planking and the metal plates.

With the foregoing object outlined, and with other objects in view which will appear as the description proceeds, the invention consists in the novel features hereinafter described in detail, illustrated in the accompanying drawings and more particularly pointed out in the appended claims.

Referring to the drawings Figure l is a transverse sectional view of a portion of a ships hull showing my invention applied thereto.

Fig. 2 is a perspective view of a portion of the construction shown in Fig. 1.

Fig.3 is a detailed sectional view on an enlarged scale.

Fig. i is a diagram showing the relative bending movements of a ships side.

Tn the drawings the outer wooden planking of the ships hull is shown as extending longitudinally of the vertically arranged transverse wooden ribs or frames, and located on the inner sides of the transverse frames are longitudinally extending wooden inner planking.

The construction so far described is that oftlre ordinaryship and the sides are usually reinforced by the inner hold beams. In order, however, to eliminate the hold beams and at the same time to secure the necessary stability, T have provided metal reinforce ments 1 which are arranged in alinement with the transverse ribs and extend from the deck to the keel.

These metal reinforcements are in the form of flat straps which lie flush with the inner planking and rest at points on vertical inner linings 3. The metal straps forming the reinforcements have their ends connected together as shown at 2, so that they may be conveniently fitted to the sides of the ship. The end straps at the keel and deck are angularly bent as shown to pro vide knees which engage said keel and deck. lVith the foregoing construction internal forces exerted by the weight of the cargo and machinery 'ill not be directly transmitted to the transverse frames or ribs and the ship planking and external forces caused by the water will not affect the transverse frames and planking.

A ship s hull is ordinarily subjected to the following forces, first, the lateral pressure of the water; second, the lateral pressure of the cargo; third, the vertical pressure of the water; fourth, the vertical pressure of the cargo; fifth, the lateral forces arising through rocking, and sixth, the lateral forces arising from waves dashing over the ships sides.

In View of the forces exerted on the hull it is necessary for the sake of safety to have some form of internal reinforcements. This I have endeavored to provide without decreasing the cargo space.

In the diagram shown by Fig. 4 the, bending movements caused by external forcesis shown diagrannnatrcally, and it will be seen that these bending movements are of gradually increasing curvature. In the diagram the curve a (Z shows the gradually increasing bending movements at the top side of the hull, the curve Z) (Z shows the bending movement at the middle; the curve 6 (Z shows the bending movement at the bottom bilge; the surve (3 shows the lateral forces at the beam end; and Z shows the depth of the hold.

From the foregoing I believe that the con struction and advantages of my invention will be readily understood and I am aware that changes may be made in details Without departing from the spirit of the invention as set forth in the claims.

lVhat I claim and desire to secure by Letters Patent is:

1. In a ships hull the combination With the transverse Wooden frames, and inner and l outer longitudinal planking, of metallic reinforcements for the transverse frames laid inside the inner planking in line with the transverse frames, and fastenings extending through the outer planking, transverse frames, inner planking and metallic reinforcements to hold the parts together, the reinforcements being extended from the keel to the deck knee.

2. In a ships hull the cornbination with the transverse Wooden frames and inner and outer longitudinal planking, of metallic plates for the transverse frames laid on the inner surface of the inner planking in line with the transverse frames and extending from keel to deck knee, and fastening bolts extending through the outer planking, trans-

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