US256324A - Samuel ibwin - Google Patents

Description

(No Model.)

8. IRWIN. OAR LOOK.

Patented Apr. 11,1882,

INVENTOR ATTORNEYS WITNES N, PETiIL FhvtbLilhogl'lpMr, Wlahington, D C.

h I UNITED STATES PATENT "OFFICE.

SAMUEL IRWIN, OF LINDSAY, ONTARIO, CANADA.

OAR-LOCK.

SPEGIFIGATION forming part of Letters Patent No. 256,324,. dated April 11, 1882.

Application filed January 6,1882. (N model.)

To all whom it may concern:

Be it known that I, SAMUEL IRWIN, of the town of Lindsay, in the county of Victoria and Province of Ontario, Dominion of Canada, have invented a new and useful Improvement in Oar-Locks; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which-- Figure 1 is a plan view of a complete oar and its attachment. Fig. 2 is an enlarged plan view of the oarsockets, segments, and fulcrumbox, the latter having its top plate removed by a sectional cut. Fig. 3 is a longitudinal section of Fig. 2 through the line w w. Figsl 4 and 5 are respectively a top view and a longitudinal section of the gunwale-plate. Fig. 6 is a detail view, in perspective, of the fulcrum-box, which is cast in one piece.

My invention is an improvement in thatclass of oar-locks'whose object is to enable a person in rowing to face in the direction in which the boat is being propelled, thus facilitating the steering and avoiding the necessity of turning and looking around from time to time. The particular form of devices for accomplishing this result upon which my improvement is based is that in which the handie-section and blade-section of the oar are separately fulcrumed between plates, and their adjacent ends provided with toothed segments that gear with each other to produce a compound movement, and in which the fulcrum-plates are provided with journals or trunnions that rock in hearings on the gunwale or outrigger to permit the vertical oscillation ofthepaddle in entering and leaving the water.

My improvement consists in the peculiar construction of the fulcrum-boxes and the construction and arrangement of the toothed segments of these oar-sections, designed to obviate all looseness at this point and cause the movement of one oar-section to be reproduced in the other oar-section with a corresponding full and equal movement, as hereinafter more fully described.

In the drawings, A A represent the two sections of adivided oar, which are firmly seated in the sockets a a These sockets are formed with toothed segmentsC (l at their adjacent ends, which mesh into each other between the two plates B B and are fulcrumed upon bolts or pins D11 Now, when the handle-section of the oar '(see Fig. 1) is pulled in the direction of the arrow or toward the rower, the outer or blade section, it will be seen, moves in the same direction and propels the boat forward in the direction in which the rower is facing. This general construction of oar as thus described I do not claim as new but it will be seen that if there is any looseness at the fulcrumbolts, or if the teeth of the segments are free to slide over each other vertically, the outer section of the oar will drop and be loose, and the movement given to the handle-section will not be exactly reproduced in a corresponding full. movement of theblade section. It is therefore very necessary that there should he no looseness whatever at this point. For the purpose of avoiding such looseness and preserving a stiff and staunch connection at this point, such as will resist the heavy wearing strain to which theseparts are subjected, I first cast the upper plate, B, and

lower plate, B of the fulcrum-box in one piece, connected by the four posts 0. Then the hub of the segments which encircle the fulcrum pins is made with a long bearing, while the width of the teeth is less than that of the hubs by about one-half. Now, by reference to Fig. 3, it-will be seen that the upper plate of the fulcrum -box is depressed in its center and has a bearing upon the top faces of the teeth of the segments, which, coacting with the long bearing of the fulcrum-hubs, causes the teeth always to rest in the same relative plane and prevents the drooping of the outer section of the oar, and makes it to reproduce the full movement of the handle section. While, however, the top plate, B, is made to bear against the edges of the teeth to secure the result described, the lower plate, 0, is v slightly removed from the bottom edges of the teeth, so as to allow any dirt or trash that might get between the teeth to drop out, instead of being retained at that point. The casting of the fulcrum-box all in one piece, it will be seen, also serves to hold the two plates rigidly in place, which it is impossible to do when the plates are simply connected by bolts, for the shaking movement of the oar incident to its use will sooner or later involve some looseness.

In order to allow the necessary vertical rocking movement of the oar to permit it to enter and leave the water, the fulcrum-box has on its opposite sides, and projecting at right angles to the oar, trunnions dd, which rest in bearings in upturned lugs, c e, of the gunwaleplate j, which latter is screwed to the gunwale of the boat. To permit of the insertion or re moval of these trunnions, one of the bearings of thelugs is in the nature of an open slot, which is closed by a spring-seated slide, g, which being pulled back, a trunnion is inserted in the hole in the other lug, the other trunnion then dropped laterally into the slot, and the slide then allowed to press up against and inclosc the trunnion in said slot.

Having thus described my invention, what I claim as new isfor the purpose described.

2. The gunwale-platef, havinglugse 0, one 0 of which is open-slotted, and provided with spring slide g, as and for the purpose described.

SAMUEL IRWIN.

Witnesses:

JAMES HEAP, F. D. MOORE.

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