JPS5946837B2 - Pull-up rudder for small vessels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pulling rudder for a small boat that can be pulled up on board when beaching or the like.

When a small vessel such as a fishing boat is brought up to the beach, the rudder protruding from below the bottom of the boat becomes an obstacle, so the rudder can be pulled up, and for this reason, the rudder is detachably attached to the hull.

This type of rudder is usually called a steer rudder, and it is known that it is constructed by attaching a dry plate to the lower end of a rudder shaft made of a round bar or pipe. Such a rudder is designed to be pivotally supported by a bracket attached to the hull side, and a notch is provided on one side of this bracket, and a guide hole connected to this notch is also provided on the hull side. The dry plate is inserted and removed in the vertical direction through these notches and guide holes. Therefore, in this type of product, if the thickness of the dry plate is made larger than the outer diameter of the rudder shaft, the above-mentioned notch to be formed in the bracket must be made larger, but if the notch is made larger, the rudder shaft will escape to the side. Therefore, it becomes impossible to rotatably support the rudder shaft. For this reason, in conventional steering wheels, the thickness of the dry plate is smaller than the outer diameter of the rudder shaft, and a so-called single-plate rudder has been used.
However, the single-plate rudder has the disadvantage that not only its rigidity is low, but also the rudder's steering is insufficient, and when sailing, a vortex is generated immediately after the rudder axis, which contributes to running resistance. Therefore, it is desired to adopt a thick rudder in which the dry plate has a relatively large thickness, for example, the maximum thickness of the dry plate matches at least the outer diameter of the rudder shaft.

This invention was made based on these circumstances,
To provide a rudder, that is, a pull-up rudder for a small boat, which enables the use of a thick dry plate without the need to enlarge the notch of a conventional bracket, has good steering performance, and reduces running resistance.

A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In the figure, 1 is the hull of a small fishing boat made of F-R-P (fiber-reinforced plastic), 2 is the engine, 3 is the propeller shaft,
4 is a propeller, 5 is a universal joint, 6 is a pulling rod of the propeller shaft 3, and T is a pulling rudder according to the present invention, that is, a steering wheel.

The rudder T is constructed by integrally attaching a dry plate 9 to the lower rear surface of the rudder shaft 8.

The rudder shaft 8 has a pipe shape made of, for example, stainless steel, and has a mounting plate 10 welded to the lower rear surface thereof, which substantially matches the vertical dimension of the dry plate 9. On the other hand, the dry plate 9 is formed by extrusion molding an aluminum alloy, and its external cross-sectional shape has a substantially streamlined shape in which the plate thickness decreases toward the rear. The maximum thickness of the dry plate 9 is formed to match the outer diameter of the rudder axle 8 or to be larger than the outer diameter of the rudder axle 8 . Further, since the dry plate 9 is extrusion-molded, it has a plurality of hollow parts inside thereof in the vertical direction. The front surface of this dry plate 9 forms an arcuate surface 11 concentric with the rudder shaft 8, and between this arcuate surface 11 and the outer surface of the rudder shaft 8, recesses 12, 12, which will be described later, are formed. It's summery. A fitting groove 13 extending in the vertical direction is opened in this arcuate surface 11, and the mounting plate 10 is fitted into this fitting groove 13. The rear end surface of this mounting plate 10 is designed to abut against the bottom surface of the fitting groove 13, and since the length of the mounting plate 10 in the longitudinal direction is greater than the depth of the fitting groove 13, the circular arc of the steering plate 9 is formed. The surface 11 is spaced apart from the outer surface of the rudder shaft 8, so that the recesses 12, 12 are formed between the rudder shaft 8 and the rudder plate 9. It goes without saying that the recesses 12, 12 are continuously formed along the direction of the rudder shaft 8 over the entire vertical length of the rudder plate 9. The mounting plate 10 in the fitting groove 13 is fixed by screwing bolts 14 into threaded holes 15 formed in one side wall of the fitting groove 13. At this time, bolts 14...
A through hole 16a is opened for inserting the . ing. Further, the vertical end surface of the steering plate 9 is formed in the hollow portion and the fitting groove 1.
3 are open, these upper and lower surfaces are closed by the closing plates 17,
It is closed at 18. These closing plates 17 and 18 are made of synthetic resin, for example, and have a shape that matches the cross-sectional shape of the steering plate 9 shown in FIG.
It is screwed onto the flesh part of the body. Engagement grooves 20, 20 are provided in the left and right front edges of the rudder plate 9 along the vertical direction, and these engagement grooves 20, 20 are covered with covers 21, 21 made of an elastic material such as a rubber band. One end is attached. The other ends of these covers 21, 21 extend toward the side surface of the rudder shaft 8, are in close contact with the rudder shaft 8, and cover the openings of the recesses 12, 12. The rudder 7 configured as described above is detachably attached to and pivotally supported by a bracket 23 provided on the deck 22 of the hull 1. That is, as shown in FIGS. 2 and 3, the deck 22 has a guide hole 24 through which the steering plate 9 can be inserted in the vertical direction, and a bracket 23 is attached to the front end of the guide hole 24. ing.
The bracket 23 is composed of a base 25 fixed to the deck 22 and a cylindrical support part 26 welded to the base 25. A cutout 27 communicating with the guide hole 24 is opened on one side of the support part 26. has been done. The support portion 26 rotatably supports the rudder shaft 8, and the cutout portion 27 is provided on the mounting plate 1.
0 has an opening width large enough to be inserted in the vertical direction, and such a bracket 23 is not much different from that of a conventional type that supports a single-plate rudder. In the figure, 28 is an operating rod for operating the rudder 7, and 29 is a stop ring fixed to the rudder axle 8 via a locking device 30, which is stopped on the upper surface of the support part 26 of the bracket 23 and the rudder 7 is in the lowered position. to regulate. Further, 31 is a stopper provided protrudingly from the stop ring 29, and the notch 27
The rotation range of the rudder shaft 8 is restricted by intervening therein and coming into contact with the left and right opening edges of the notch 27 . The operation of the steering wheel 7 having such a configuration will be explained.

To insert the rudder 7, the rudder shaft 8 is placed to face above the support part 26 of the bracket 23, and the rudder plate 9 is made to face above the guide hole 24.

Then, the mounting plate 10 is passed through the notch 27 and the rudder 7 is lowered. Then, the recesses 12, 12 formed in the rudder 7 are lowered while passing through the edge portions 26a, 26a located opposite to each other on both sides of the notch 27 in the bracket 23. Therefore, there is no need to increase the opening width of the notch 27 formed in the bracket 23, that is, the circumferential dimension.
It may be simply large enough for the mounting plate 10 to pass through. Therefore, a conventional bracket for a single-plate rudder can be used without any modification. The rudder 7 lowered in this way is
Since the stop ring 29 stops on the upper surface of the support part 26 of the bracket 23, its descent is restricted and the steering plate 9 is immersed below the water surface. When the rudder axle 8 is rotated via the operating rod 28, the rudder axle 8 is rotatably supported by the support portion 26 of the bracket 23, so that it can be freely rotated. In this case, since the opening width of the notch 27 is smaller than the outer diameter of the rudder shaft 8, the rudder plate 9
Even if a rearward force is applied to the rudder axle 8 through the
will not escape from the notch 27 to the rear. Further, the rotation range of the rudder shaft 8 is restricted by a stopper 31. In such a rudder 7, the thickness of the rudder plate 9 is formed to at least match the rudder shaft 8, so that the rudder 7 has high rigidity and good steering control. In addition, when the steering plate 9 is in a steering posture inclined with respect to the direction of travel, large water resistance is applied to one side of the steering plate 9, and this resistance force is transmitted to the mounting plate 10 that supports the steering plate 9. However, since the mounting plate 10 is formed to have a length extending between the upper and lower ends of the steering plate 9, the resistance force is large and the mechanical strength is large. In addition, since the upper and lower end surfaces of the steering plate 9 are closed with synthetic resin blocking plates 17 and 18, water does not flow into the hollow part or the fitting groove 13, and there is little resistance due to water flow. Synthetic resin closure plate 18,1
9 becomes lighter.

The through holes 16a, which are opened for screwing the bolts 14, are also opened only on one side, and the openings are also closed by the plugs 16. This prevents the inflow of water and reduces running resistance. Furthermore, covers 21, 21 are provided on both sides of the front end of the steering plate 9.
are attached, and the recesses 12, 1 are closed by the covers 21, 21.
Since the openings 2 are closed, water attempting to flow into the recesses 12, 12 is blocked by the covers 21, 21,
No vortices are generated within these recesses 12, 12 behind the rudder shaft 8.

Moreover, since the leading edge of the covers 21, 21 is in close contact with the side surface of the rudder shaft 8, the covers 21, 21 do not open due to the water flow, which prevents an increase in running resistance, and rather prevents the concave portion 12,
12 is closed, the running resistance becomes smaller. The covers 21, 21 are pushed open by the bracket 23 when the rudder plate 9 approaches the bracket 23 when the rudder 7 is inserted, so they do not become an obstacle to inserting the rudder 7, and when the rudder plate 9 passes the bracket 23, the covers 21, 21 are pushed open by the bracket 23. It elastically returns to close the recesses 12, 12, and the tip comes into close contact with the rudder shaft 8. When the rudder 7 is pulled up onto the ship for reasons such as beaching the ship, the mounting plate 10 is pulled up facing the notch 27 in the support part 26 of the bracket 23, and the recess 1 of the rudder 7
2 and 12 are edges 2 on both sides of the notch 27 in the support portion 26
Since it escapes and passes through 6a and 26a, it can be pulled up directly above. At this time, the covers 21, 21 are pushed open by the bracket 23 in the same way as when the rudder 7 is inserted, so that they do not interfere with the passage of the rudder plate 9. Note that there are closing plates 17 and 18 that close the upper and lower surfaces of the rudder plate 9.
If it is made of a metal plate and its front edge is welded to the rudder shaft 8, the torque applied to the mounting plate 10 can be shared by the closing plates 17 and 18, thereby improving mechanical strength. It is also possible to adopt such a configuration.

In the above embodiment, the steering plate 9 is formed of an extrusion molded product made of aluminum alloy, but the present invention may be constructed as in the second embodiment shown in FIGS. 5 to 8. .

That is, in this embodiment, the steering plate 30 is made of a soft material,
For example, it is molded from non-foaming urethane resin, and fins 31, 31 extending forward are integrally molded on both sides of its front end.

Fixed arms 32, 32 are welded to the lower part of the rudder shaft 8 at a distance in the vertical direction.
are fitted into the fitting holes 33, 33 formed in the rudder plate 30,
Pass bolts 35 through the fixing arms 32, 32 between fixing holes 34, 34 opened on both sides of the steering plate 30, and tighten with nuts 36... It has been done. There are recesses 37, 3 between the front surface of the rudder plate 30 and the rudder shaft 8.
7 is formed, but the sides of these recesses 37, 37 are covered by the fins 31, 31, and these fins 31, 31 are similar to the covers 21, 21 of the first embodiment. functions. Further, support plates 38 and 39 are fixed to the upper and lower end surfaces of the steering plate 30 by screws 40, etc. These support plates 38 and 39 are made of metal, and the front edge of the upper support plate 38 is welded to the rudder shaft 8 as shown in FIG. 7, and the lower support plate 39 is welded to the rudder shaft 8 as shown in FIG. The front end thereof covers the lower surface of the rudder shaft 8 and is welded to the rudder shaft 8. Note that the fixing holes 34, which are drilled to attach the bolts 35, nuts 36, etc., are closed with synthetic resin plugs 41. . Even with a rudder having such a configuration, when lowering and raising it, the fixed arms 32, 32 pass through the notch 27 formed in the support part 26 of the bracket 23, and at this time, the notches 27 on both sides Since the edges 26a, 26a are relieved by the recesses 37, 37, there is no need to increase the opening width of the notch 27.

Moreover, this thing has a fin portion 31 that covers the recessed portions 37, 37,
31 is integrally molded with the rudder plate 30, so the number of parts is reduced. When such fins 31, 31 are integrally molded, the fins 31, 31 must be elastically deformable, so the steering plate 30 is made of a soft elastic material such as non-foaming urethane resin, and its rigidity is reduced. Although there is a risk that the rudder plate 30 may be lowered, the rudder plate 30 is not only fixed to the rudder shaft 8 via the fixed arms 32, 32, but also supported by the upper and lower support plates 38, 3.
9 is also fixed to the rudder shaft 8, problems such as bending of the rudder plate 30 when subjected to large water resistance do not occur. In particular, if the upper and lower support plates 38 and 39 are made of thin steel plates or the like, they will be flat in the direction perpendicular to the plane of the paper in FIG. Since the rigidity in the direction is high, it can support a large torque, and there is no risk that the upper and lower ends will deform along the direction of water resistance. Note that non-foaming urethane resin does not have water absorption properties, so there is no need for troublesome efforts such as applying a special waterproof coating to the surface.

Furthermore, in the first and second embodiments described above, the steering plate 8
, 30 are integrally molded by extrusion molding or die molding, but it is also possible to implement a rudder plate that is divided into two parts along the center line.

According to the present invention described in detail above, the rudder plate provided on the rudder axle is made into a relatively thick plate shape, and a recessed portion along the rudder axle direction is formed near the periphery of the rudder axle. Even if the bracket is equipped with a thick rudder plate, the recess can pass through the edges on both sides of the notch when the rudder is raised or lowered, so the bracket can be used without any modification even if the rudder has a thick rudder plate. can.

Therefore, the advantages of a thick rudder, such as rigidity and high maneuverability, can be effectively utilized as they are.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, in which FIG. 1 is a side view of a small fishing boat, FIG. 2 is a sectional view of main parts, and FIG.
The figure is a top view from above the deck showing the bracket, Figure 4 is a sectional view taken along the line ■-■ in Figure 2, Figures 5 to 8 show a second embodiment of the present invention, and Figure 5 6 is a sectional view taken along the line ■-■ in FIG. 5, FIG. 7 is a sectional view taken along the line ■-■ in FIG. 5, and FIG. 5 is a view taken along the line ■1■ in Figure 5. 1...Hull, 4...Propeller, 7...
... Rudder (rudder), 8 ... Rudder shaft, 9 ...
... Rudder plate, 10... Mounting plate, 12, 12...
... recess, 21, 21... cover, 23...
...Bracket, 26...Support part, 27.
...Notch, 30... Rudder plate, 31, 31
...Fin part, 37, 37... Concave part.

Claims (1)

[Claims] 1 Consists of a rudder axle and a thick plate-shaped rudder plate provided on the rudder axle, and the rudder plate has a section located near the circumference of the rudder axle that extends along the rudder axis direction between both ends of the rudder plate in the rudder axis direction. A pull-up rudder for a small boat, characterized by forming a continuous concave portion.