US142677A - Improvement in center-boards for vessels - Google Patents

Description

l. GALL.

Center Boards for Vessels.

Patented September 9, 1873..

En STATES PATENT FFICE.

JAMES CALL, OF RICHMOND, MAINE.

Specification forming part of Letters Patent N 0. 142,677, dated September 9,1873; application iiled July 26, 1873.

To all whom it may concern Be it known that I, JAMES CALL, oi' Richmond, in the county of Sagadahoc and State of Maine, have invented a new and valuable Improvement in Center-Boards for Vessels; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings making a part of this specification, and to the letters and figures of reference marked thereon.

Figure l of the drawings is a representation of a perspective view of my center-board. Fig. 2 is a sectional view of the same.

My invention relates to center-boards for vessels; and it consists in the construction and novel arrangement of the horizontal flanges on each side of the lower edge of the center board; of the oblique curved slots through the center-board 5. the guard-plate, with its transverse pins, engaging with said slots; the pivoted arms and the tube for the operatingrod, as hereinafter more fully described.

In the drawings7 A represents the keel of a vessel; B, the vessels bottom; C, the center-board. D D are pivoted arms connecting the center-board and keel. E is an iron guardglate attached by bent langes to the side of the keel, and forming therewith a slot, within which the center-board plays. F is atube running rom the bottom of the vessel to the deck. G indicates an operatig-rod running through the tube and connecting with the center-board by means of which the said center-board may be raised or lowered at pleasure. H represents base flanges horizontally extending outward from each side of the bottom of the center-board at right angles therewith, showing, in cross-section, the form of an inverted T. I I are oblique-curved slots in the centerboard, through which pass the pins KK. These strengthen the iron plate on the side of the keel, and serve as bearings, upon which the center-board rests when in its raised or depressed position. The curvature of the slots is opposed to the curve of direction of the center-board and tangential thereto, so that when the center-board is fully raised or depressed it will remain in position.

It will be perceived that this invention may be applied to any vessel of ordinary construction with but little labor or expense, and without impairing the strength or security of the vessel. Sometimes it is preferred, instead of using a guard-plate, to slot the keel itself 5 or the center-board may be double, embracing the keel. i

The protecting side plate E should, properly, be made of malleable iron. Its width and appropriate thickness will be proportioned to the 'size of the vessel to which it is to be applied.

The extremities of the plate E should be reenforced on the inner sides of the iianges to strengthen the hold of the bolts passing through them, and also to govern the width of the slot proportioned to the center-board intended to move therein.

The horizontal iian ges on the lower edge of the center-board are designed to hold the Water to said board, and thereby to serve to prevent lateral deviation, keeping the vessel in a true course while they offer no obstacle to direct motion.

What I claim as-new, and desireto secure b lLetters Patent, is-

The T-shaped center-board C, having the oblique-curved slots I, in combination with the guide-pins K, pivoted arms I), and operating-rod G, substantially as specified.

In testimony that I claim the above I hereunto subscribe my name in the presence of two witnesses.

JAMES CALL.

Witnesses:

J osEPH CALL, Jos. M. BLAGDEN.

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