This invention appertains to improvements in manually operated propulsion means for small boats generally, and more particularly to a stern sculling oar type thereof.
One of the several objects of the invention is to provide a novel form of mounting for a sculling oar of the type employed at the stern of a boat, in the use of which, an unskilled person can readily and easily propel and maneuver the boat with a facility substantially equal to that of the experienced boatman or sportsmen performing the ordinary method of sculling oar manipulation, which necessitates a skillful arm and wrist motion that can be acquired over a long period of practice.
Another object of the invention has to do with the provision of an automatic lock for a sculling oar of the kind specified, which, with the oar manipulated by an unskilled person and with a substantially straight-arm motion only, functions effectively to simulate accurately the motions imparted to a sculling oar by the boatman or sportsman skilled in the art of stern sculling.
A further object of the invention is to provide an oar lock of this character, wherein the requisite motion is automatically imparted to the oar, with the use of one arm only of the operator and from a position that readily permits of a more or less constant observation in the directional of boat travel, thus leaving the other arm free for casting or "flash" fishing.
Yet another object of the invention lies in the provision of an automatic sculling oar lock, and one having the advantages of being adapted for detachable mounting on the transom of practically all types of oar propelled boats; strong and durable in construction; comparatively inexpensive to manufacture; easy to install; quickly adjustable to proper working angles; and operating to positively and instantaneously change the feather or pitch of the oar, with no lost motion or dead stroke, at the end of each of the reversed directional movements of the oar.
With these and other objects and advantages in view, the invention resides in the certain new and useful combination, construction, and arrangement of parts, as will be hereinafter more fully described, set forth in the appended claims, and illustrated in the accompanying drawing, in which: Figure 1 is a side elevation of the improved scull oar lock, in accordance with the invention; Figure 2 is a top plan view; Figure 3 is a front end elevation; and 5 Figure 4 is a cross section, taken through the line 4-4 on Figure 1.
Referring to the drawing, wherein like characters of reference denote corresponding parts in the several views, 10 designates the transom at the stern of a boat and 12 a more or less conventional form of sculling oar, while the embodiment of the invention, as it is exemplified therein, is generally comprised in a supporting bracket 14 to be seated over the edge of *the transom 10; a platform or table 22 hingedly mounted on the bracket 14, an oscillatory member 34 pivotally mounted on the platform or table 22; a guide member 48 rigidly mounted on the pivot mounting for the oscillatory member 34; means for adjusting the platform or table 22 relatively to the bracket 14 to vary the working angle of the oar 12; and an oscillatory brake member 60 mounted on the platform or table 22 for cooperation with the oscillatory member 34 to check the reversed directional movements of the oar 12 coincident with the reversing of the angle of feather or pitch of the blade of oar 12 by the action of the guide member 48.
Specifically, the bracket 14 is preferably made from a blank stamped from a heavy gauge steel sheet or plate, which is shaped to provide a substantially rectangular body part having a pair of spaced, inwardly and downwardly angled, straplike parts bent from and to one side of its top edge to form inverted U-shaped elements 16, to be engaged over the edge of the transom 10, after, the manner as shown in Figure 1, and an upwardly extending and inwardly angled straplike part 20, disposed centrally with respect to the elements 16. Each of the depending portions of the elements 16 carries a clamp screw 18 which, when tightened, rigidly secures the bracket 14 in place on the transom 10.
The platform or table 22 is constituted in a strip of the steel sheet or plate and is supported in overlying relation with respect to the horizontal portion of the angled part 20 by a hinge con5nection 24, one part of which is formed at the free end of the said horizontal part and the other is mounted transversely of the under side of the platform or table, at an intermediate point thereon. An arm 26 depends from the rearwardly 0 directed end of the platform or table 22 and carries a pin 28, at its free end, for selective engagement with a series of apertures 30, formed in an arcuate member 32, that projects in an upwardly curving direction from the outer side 5 of the bracket body 14; by which means, the platform or table 22 is angularly adjustable relatively to the angled part 20.
The oscillatory member 34 takes the form of a substantially triangular stamping of the steel sheet or plate and is supported in overlying relation with respect to the platform or table 22, with its narrower end projecting beyond the rearwardly directed end thereof, and is rigidly secured to an inverted, substantially V-shaped element 40, at a point adjacent its bight. One leg 1 42 of this element 40 is seated in a tubular socket 46, that is secured in vertical position on the upper portion of the arm 26, and constitutes a pivot for the oscillatory member 34, while the other leg 44 extends rearwardly and downwardly at an acute angle for the mounting of the oar 12 thereon.
The guide member 48 is in the form of an open frame, that is substantially heart-shape in elevation, and is secured at its apex transversely of the bight of the element 40, in substantially right angular relation with respect to the leg 44.
A pin 50 projects forwardly from the center of the upper side, or base, of the guide member 48 and is engaged by an eye 52, carried on a sleeve 54 fixedly mounted on the loom or shank of the oar 12, inwardly of the hand-grip 12'. A ring bearing 56 is mounted on the free end of the leg 44, of the angled element 40, and is engaged by a bearing sleeve 58, also fixedly mounted on the loom or shank of the oar 12, at a point thereon between the sleeve 54 and the blade 12".
The brake means is comprised in a metal disc 60, which, together with an underlying disc 64, of hard fiber or other suitable friction producing material, is mounted for oscillatory motion on a pivot 66, that is secured in the forwardly directed end of the platform or table 22, beyond the like end of the oscillatory member 34. The metal disc 60 is provided with a pair of spaced prongs or teeth 62, projecting radially from its edge for engagement with a pair of similarly spaced apertures 38, formed in an upstanding flange 36; rising from the wider, forwardly directed, end of the oscillatory member 34. Thus, the reversed directional movements of the oscillatory member 34 are limited by the alternate engagement of one or the other of the apertures 38 with one of the corresponding teeth 62.
In operation, with the improved oarlock clamped on the edge of the transom 10 at the center thereor, the operator will take a sidewise stance, facing either left or right, and will then loosely grasp the hand-grip 12' with his near hand and manipulate the oar 12 with a substantially straight-line, push and pull, motion of the arm, with the result that the blade 12" is moved in the water from side to side, i. e., thwartwise, somewhat in the manner as depicted in dotted lines in Figure 2. With the back and forth movement of the oar 12, it swings or rocks on the pin 50 and, toward the end of its reversed strokes, moves into rolling contact with the oppositely curved sides of the guide 48, in a manner that the blade 12" is automatically feathered to a proper angle of pitch in conformity with the conventional sculling stroke, as illustrated in dotted lines in Figure 4. The side to side movement of the oar 12, in the guide 48, is accompanied by a like movement of the oscillatory member 34 and the angular element 40, the leg 42 of the latter turning in the socket 46, and the extent of such movement is limited by the cooperative action of the apertures 38, in the flange 36 of the oscillatory member 34, with the teeth 62, of the brake disc 60, as will be well understood by the average mechanic.
Without further description, it will be evident that in the use of this oarlock, a true sculling stroke is reproduced mechanically with but one hand without the usual twisting motion of the wrist and with considerably less effort and, also, that the oar 12 will take a neutral position within the guide member 48 when released from the 0 grasp of the operator, in which position, it may trail without attention and without fear of loss.
Also, it will be apparent that the working angle of the oar 12 may be readily adjusted for its efficient operation by persons of differing stature, or for varying the depth of immersion of the blade as may be desirable for boat propulsion and control under different conditions of the water.
Having thus fully described my invention, it is to be understood that various changes in the design of the disclosed embodiment, and in the structural details of its parts, may be resorted to, provided such changes fall within its spirit and its scope as claimed.
What I claim is: 1. An automatic lock for a sculling oar, comprising a bracket, clamp means for removably securing said bracket centrally of the transom of a boat, a member mounted for horizontal oscillatory movement, means connecting said member and said bracket, a bearing rigidly mounted on said member and engaged by the oar, said member and the bearing being actuated by thwartwise sculling motions imparted to the oar, a guide mounted on said bearing and movable with said oscillatory member, and means interconnecting said oar with said guide member to cause turning movements of the oar to reverse the pitch of its blade, when the limit of each directional movement of the oscillatory member is reached.
2. The invention as in claim 1, with a means for limiting the reversed directional movements of said member and the oar.
3. The invention as in claim 1, with means for adjusting said member relatively to said bracket to vary the working angle of the oar.
4. An automatic lock for a sculling oar comprising a bracket adapted to be engaged over the edge of the transom of a boat, clamp means carried by said bracket for securing it in place, a platform pivotally mounted on said bracket, cooperative means on said bracket and the platform for adjusting the latter angularly with respect to the bracket, a member mounted for horizontal oscillatory movement relatively to said platform and engaged by the oar, a bearing rigidly mounted on said oscillatory member, said oscillatory member and the bearing being actuated by thwartwise sculling motions imparted to go the oar, a guide mounted on said bearing and movable therewith, and means interconnecting said oar with said guide to cause turning movements of the oar to reverse the pitch of the blade thereof when the limit of each directional movement of said oscillatory member and the bearing is reached.
5. The oar lock as in claim 4, with an angled part of said bracket extending above and overlying the transom edge for the pivoting of said platform thereon.
6. The oar lock as in claim 4, with a brake means mounted on said platform and cooperating with said member to limit the directional oscillatory movements of the same and the oar. 7. An automatic lock for a sculling oar, comprising a bracket adapted to be clamped over the edge of the transom of a boat, an angled part extending upwardly and inwardly of said bracket and overlying the edge of the transom, a platform hingedly connected to the inwardly directed end of said angled part, means for adjusting said platform angularly with respect to said angled part, a member mounted for horizontal oscillatory motion on said platform, an angled element rigidly connected with said oscillatory member and having one leg thereof downwardly inclined beyond the outer side of the transom, a ring bearing on said inclined leg and engaged by said oar, a guide member mounted on said inclined leg inwardly from said ring bearing and also engaged by the oar, and means interconnecting said oar with said guide member to cause turning movements of the oar to reverse the pitch of the blade thereof when the limit of each directional movement of said oscillatory member is reached.
GERALD C. HOSACK.