Untitled record

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N-PETERS. PHOTO-LfTHOGRAPHER, WASHINGTON. D C.

UNITED STATES PATENT OFFICE.

DONALD TAYLOR, OF EAST BOSTON, MASSACHUSETTS.

BERTH-KNEE FORMER.

Specification, of Letters Patent No. 11,005, dated June 6, 1854.

To dll whom it may concern :

Be it known that I, Donald Taylor, of East Boston, in the county of Suffolk and State of Massachusetts, have invented a new 5 and useful Improvement, which I term a “ berth-knee former ” and which is for the use of ship-carpenters, the same being to enable them to ascertain the correct forms of overlapping berth-knees; and I do hereby 10 declare, that the same is fully described and represented in the following specification and the accompanying drawings, letters, figures, and references thereof.

_ Of the said drawings Figure 1, denotes a 15 side view of the said instrument. Fig. 2, is a longitudinal section of the same. Fig. 3, is a cross section of it taken through one of the rules A, B, to be hereinafter described.

In the said drawings, the said two rules 20 A, B, are formed of bars of metal or wood, each of which is made with a slot, a, extending through it in one direction and also another slot, b, extending through it at right angles to the first, the whole being arranged 25 as seen in the drawings. These two rulers or bars operate in connection with two parallel rulers or bars C, D, which are respectively provided with elongated slots c, . d, arranged as seen in Figs. 1 and 2, and are SO kept apart from one another by two circular rollers G, H, which have the same diameter and are respectively arranged within the slots b, b, of the bars A, B, and have their axles extended through the other slots 35 of said bars. The two bars, 0, D, extend into the slots b, b, of the bars A, B, and they are held to said bars by means of screws, e, e, e, and clamping nuts /, /, /, arranged and applied as seen in the drawings, the bars 40 A B turning freely on the clamps of said screws. There is also applied to the inner side of each bar A B, a flexible spring F, F, which is fastened at its outer end to a bar, while at or near its inner end it rests in a 45 groove, g, ploughed longitudinally in the outer edge of the bar C. There is' also another bar, I, arranged parallel to the bar D and connected to it by means of screws K, K, K, which extend through the bar D, 50 and screw through female screw plates L, L, L, fastened to said bar, the said screws being so applied to the bar, I, as to be fastened to said bar and yet be capable of free rotation. The object of this latter bar, I, 55 provided with screws and connected to the bar, D, as specified is to enable the distance, between the two outer edges of the bars C ✓ and I to be increased as circumstances may require.

In the application of the instrument to 60 the formation of berth knees, the distance between the two outer edges of the bars C, and I, is to be first adjusted to the thickness, which the two overlapping berth knees are to have when they overlap each other. The 65 thickness is illustrated by dotted lines in Fig. 4, which serves to represent two of the knees—one being seen at M and the other at N, and as placed between two berth timbers Ο P. Next the bar, I, is placed against the 70 side of the vessel and the two rulers A, B, brought up against the inner sides of the two deck timbers Ο, P so that the outer edges of the rulers shall lay in contact with the said inner sides of the said timbers 75 Ο, P. When this is done, the clamp nuts are to be turned down, so as to clamp the four rails A B, C, D, into the angular positions which they have. The instrument is now prepared for drafting the berth knees, ⁸⁹the springs F F, indicating the curves to be given to them. If after this, we lay the instrument on a plane surface, and draw lines against the two outer edges of the rules A, B, and along their curved tops and 85 around the springs, F, F, and along the outer edge of the bar, C, between the points where the bar is horizontal to said springs, and if we also draw a line along the outer edge of the bar, I, and another from some ⁹⁰point in said outer edge of the bar, I, and near to the foot of the bar, A, tangentially to the spring F, we not only obtain the overlap line of the two knees, but at the same time we have given to us the form to which ⁹⁵they are to be hewed.

The two rollers, G, H, serve to maintain the parallelism of the two bars C, D, under any circumstances.

My invention will be found to be of great 100 advantage to ship carpenters in the construction of navigable vessels as by it they are enabled with great ease to obtain the correct forms of overlapping berth knees whatever may be the position of the deck ¹⁰⁵timbers and side timbers or sides of a vessel with respect to one another.