JP6609804B2 - Rowing boat - Google Patents

Description

  The present invention relates to a side float for a boat attached to a rowing boat for competition and leisure such as a skull, a double skull, a pair and the like.

  In para rowing, which is a boating competition for disabled people, the use of a float is obligatory in order to prevent overturning of the hull and to stabilize traveling. As described in No. 3, a streamlined drainage type having a narrow lateral width and a long overall length is often used. Also, there are some which have an elongated cylindrical shape like the one described in Patent Document 4.

By the way, ship types are roughly classified into a displacement type, a sliding type, and a semi-drainage type in between. These ship types are mainly used according to the speed of the boat, and in many cases, a high speed ship of about 20 knots or more is a sliding type, a medium speed ship of around 15 knots is a semi-drainage type, and a low speed ship of 10 knots or less is a drainage type. . The drainage type is one that obtains buoyancy when the lower part of the hull is submerged below the surface of the water, and the position of the waterline does not change much while the ship is stopped or running. Many low-speed boats such as large boats and fishing boats are of this displacement type. On the other hand, the sliding type obtains buoyancy by submerging the lower part of the hull below the surface of the water when the ship is stopped or running at low speed, but the hull rises and moves above the surface of the water at high speeds. A thing that moves like sliding. Many high-speed pleasure boats are of this sliding type.
Since the boat speed of the rowing boat which is the subject of this application is around 10 knots, a displacement type hull form is adopted, and the float type has been adopted as a matter of course.

JP-A-2015-009786 JP 2003-237687 A Japanese Patent Laid-Open No. 06-321179 JP-A-11-227686

  The displacement type float as described above has a serious problem in that the resistance is high, which hinders the increase in speed and seriously impairs the attractiveness of rowing and racing that should compete for speed. Moreover, since the dimensions are large, it is inconvenient in moving the hull on land, storing it in a garage, and the like. In addition, there was a problem peculiar to rowing boats in which the splash of the float was easily applied to the rower.

  In view of the above-mentioned problems of the prior art, the present invention has a remarkably reduced resistance during traveling, is small and lightweight, is easy to handle, and utilizes the pressure of water during traveling, By increasing the restoring force, it is an object to provide a boat side float that can secure stability during traveling of the hull and solves the problem that the splash of the float is likely to be applied to the rower.

According to the present invention, the above problem is solved as follows.
(1) A boat side float that has a bottom and a sliding surface that slopes upward from the central keel toward the chine, and has a downward protrusion at the outer end of the sliding surface. The shape is a mold shape.

The inventors noticed that the resistance of the boat is closely related to the boat speed and the boat length, and that the float length is appropriate for the boat speed even in a low speed region such as a rowing boat. It was found that if the area is set and an appropriate shape is taken, good sliding performance can be obtained, and as a result, the resistance during driving can be significantly reduced.
That is, by adopting the configuration as described above, it is possible to remarkably reduce the running resistance and to greatly reduce the overall length, and to reduce the size and weight as compared with the conventional drainage type float. This makes it easier to move the boat on land and store it in the boat shed.
In addition, when floating, the lift is generated not only by the float's buoyancy but also by the dynamic pressure of the water during travel, and both the buoyancy and the lift generate a strong restoring force to the float. it can.
In addition, when the float is landing on the water, the splashing surface tends to splash from the keel toward the chine, and the splashes are scattered to the left and right of the float. Is prevented from splashing in the direction.
Therefore, the splash does not hit the rower and does not hinder rowing.

(2) In the above item (1), the running surface from the keel toward the chine is a curved surface with the central portion recessed upward in a front view.

  According to such a configuration, even if the bottom surface of the float is made thin and light, the hull shape can be maintained correctly and an increase in resistance can be prevented.

(3) In the above item (1) or (2), the lower end surface of the downward projection is an inclined surface that is inclined downward outward from the outer end of the sliding surface from the keel toward the downward projection.

    According to such a configuration, it is possible to guide the splash to be scattered outward from the float so as to face downward, so that the splash is not applied to the deaf person.

(4) In any one of the above items (1) to (3), the chine provided with the downward protrusion is made thicker than the other portions.

    According to such a configuration, it is possible to increase the strength of the chines provided with the downward protrusions that may collide with other objects and may concentrate stress during landing.

(5) In the above item (4), the upper surface of the bottom is covered with a flat-plate deck whose tip is inclined downward, and a hollow portion is formed between the bottom and the deck.

    According to such a configuration, the float can be reduced in size and weight while maintaining sufficient strength.

(6) In any one of the above items (1) to (5), the bottom angle of attack α is 7 ° ± 5 °, the upper angle γ is 10 ° ± 10 °, and the lower end surface of the downward projection is below The direction inclination angle θ is set to 20 ° to 40 °.

  According to such a configuration, the floating performance of the float is further improved, the resistance is reduced, and the speed of the rowing boat and the competition record can be improved.

  According to the present invention, the resistance during travel is remarkably reduced, and it is compact and lightweight and convenient to handle. Further, by utilizing the water pressure during travel, the restoring force of the hull is increased, so that It is possible to provide a boat side float that can secure stability and solves the problem that the splash of the float is likely to be applied to the rower.

It is a top view of a single skull provided with one embodiment of the side float for boats of the present invention. Similarly, it is an enlarged side view of a float and its attachment part. Similarly, it is an enlarged front view of a float and its attachment part. FIG. 4 is an enlarged vertical side view taken along line IV-IV in FIG. 1. FIG. 5 is an enlarged longitudinal sectional front view taken along line VV in FIG. 4.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, this single skull is provided with a passenger seat 2 at a substantially central portion of the plane view streamlined hull 1 or a portion slightly shifted back and forth from the hull 1, and from above the hull 1 above the rear portion. The rigger 3 is provided so as to project from side to side.

  The rower seat 2 in the hull 1 is provided with a stretcher 2a for fixing a foot and a seat 2c that is slidably mounted on a pair of left and right rails 2b, 2b fixed to the hull 1.

There are a plurality of types of rigger 3, but here, the rigger 3 is of a type having a single arm rod 4, 4 projecting left and right.
The left and right armbands 4 and 4 and a boat side float (hereinafter simply referred to as “float”) 14 to be attached to them have a symmetrical shape and structure. Only those are shown and described.

  A vertical plate-like clutch mounting plate 5 facing outward is fixed to the tip of each armband 4, and the rear surface of the clutch mounting plate 5 opens in a rearward U-shape in a side view. An intermediate portion of the shaft support member 6 is fixed with bolts and nuts 7 facing in the front-rear direction.

The upper and lower portions of the pivot 8 that faces substantially in the vertical direction are fixed to the rear end portion of the shaft support member 6 that is bifurcated vertically.
At the middle part of the pivot 8 whose upper and lower parts are constrained by the shaft support member 6, a cylindrical part 9 a provided in the front part of the clutch 9 having a substantially U shape in side view can be turned around the axis. And it is mounted so that the vertical position can be adjusted.
In addition, since it does not directly relate to this invention regarding the detail of the attachment structure of the cylinder part 9a to the pivot 8, description is abbreviate | omitted.

  In the clutch 9 having a substantially U shape in side view, an intermediate portion of the all 10 shown by a two-dot chain line in FIGS. 1, 2 and 4 is fitted from above, and the upper end opening of the clutch 9 is connected to the clutch pin. By closing with 11, the all 10 is prevented from coming off upward, and by clutching the all 10, the clutch 9 can rotate around the pivot 8.

  On the lower surface of the shaft support member 6, a rear end portion of a horizontal plate-like float mounting member 12 having a hanging piece 12 a at the front end portion is formed on the lower end portion of the pivot 8 protruding downward from the shaft support member 6. And a nut 13 that is screwed thereto.

  On the front surface of the hanging piece 12a of the float mounting member 12, a float support 15 having a lower end fixed to the upper surface of the float 14 is formed in a plurality of mounting holes 16 facing in the front-rear direction and drilled at a certain pitch in the vertical direction. The bolt 17 with the knob 17a selectively inserted is inserted into the mounting hole 18 provided in the hanging piece 12a and tightened with the nut 19 so that the height can be adjusted stepwise.

The float support 15 rotates about the bolt 17 by abutting against the side surface of the float support 15 on both sides of the float mounting member 12 on the front surface of the hanging piece 12a. A plurality of pins 20 that serve as detent means for preventing the projections are provided.
The number of the pins 20 may be one as long as the rotation of the float support 15 in the loosening direction can be prevented.
Further, instead of the pins 20, a pair of left and right guide projections (not shown) as a detent means for the float support 15 are projected on both sides of the front surface of the hanging piece 12 a of the float mounting member 12. You may set up.

The float 14 includes a bottom 21 and a flat plate-like deck 22 whose front end and rear end are inclined downward to cover the upper surface of the bottom 21.
Any material may be used for the bottom 2 and the deck 22. For example, fiber reinforced plastics (FRP) reinforced with carbon or glass fiber is particularly desirable in terms of moldability and weight reduction. Wood, light metal, etc. can be used arbitrarily.
The hollow portion 23 formed between the bottom 2 and the deck 22 is preferably left hollow for weight reduction, but the foam 24 may be filled in order to maintain strength. In this case, it is desirable to make the hollow portion 23 watertight so as not to increase the weight due to water absorption.

A substantially horizontal mounting plate 15a fixed to the lower end of the float support 15 is abutted from above at a central portion in the left-right direction on the upper surface of the deck 22 and a portion slightly rearward from the center in the front-rear direction. A contact plate 25 is brought into contact with the lower surface of the deck 22, and a plurality of bolts 26 that pass through the contact plate 25, the deck 22, and the mounting plate 15 a and nuts 27 that are screwed to the bolts 26 are tightened. 15 is firmly attached to the upper surface of the deck 22.
In order to adjust the angle of attack α of the bottom 21, which will be described later, a bolt (26) and a nut (27) are interposed between a front portion or a rear portion between the upper surface of the deck 22 and the mounting plate 15a. This can be done by tightening.

  A waterproof cover 28 is attached to the lower surface of the deck 22 so as to cover the heads of the backing plates 25 and the bolts 26, and prevents water from entering the inside of the deck 22 through the bolts 26 insertion portions in the deck 22. It is like that.

  On the upper surface of the deck 22, a drainage hole 29 for when water enters the float 14 is provided in the rear portion of the mounting portion of the float support 15, and the sealing lid 30 that can be opened and closed at all times. It is sealed by. In some cases, the drain hole 29 and the sealing lid 30 may be omitted.

  The bottom 21 has a sliding hull shape having a sliding surface 33 inclined upward from the central keel 31 toward the both side chines 32 and having a downward protrusion 34 provided on the outer end of the sliding surface 33. It is as.

Each sliding surface 33 has a large curvature arc-shaped or parabolic curved surface with a central portion slightly recessed upward in a front view.
According to such a configuration, even if the bottom 21 is made thin and light, the hull shape can be maintained correctly and an increase in resistance can be prevented.

The lower end surface 34 a of the downward projection 34 is an inclined surface that is inclined outwardly from the outer end of the sliding surface 33.
According to such a configuration, it is possible to guide the splash to be scattered outward from the float so as to face downward, so that the splash is not applied to the deaf person.

The thickness of the portion of the keel 31 in the bottom 21 and the thickness of the portion of the chine 32 provided with the downward projection 34 is thicker than the thickness of the other portion.
According to such a configuration, it is possible to increase the strength of the chines 32 provided with the downward protrusions 34 that may collide with other objects and may concentrate stress during landing.

As shown in FIGS. 4 and 5, the angle of attack α of the bottom 21 is 7 ° ± 5 °, the upper angle γ is 10 ° ± 10 °, and the downward inclination angle θ of the lower end surface 34a of the downward projection 34. Is preferably 20 ° to 40 °.
According to such a configuration, it is possible to improve the competition record by improving the performance of the float 14 and using it in the competition boat.

  Since the boat side float 14 of this embodiment is configured as described above, the resistance during traveling can be remarkably reduced and the overall length can be greatly shortened as compared with the conventional drainage type float. Therefore, it is possible to reduce the size and weight, and it is easy to move the boat on the ground and store it in the boat shed.

  Further, when the float 14 travels on the ground, lift is generated not only by the buoyancy of the float 14 but also by the dynamic pressure of water during travel, and a strong restoring force is generated in the float 14 by both buoyancy and lift. Can be miniaturized.

Furthermore, when the float 14 travels on the water, the splashing surface 33 inclined upward from the keel 31 toward the chine 32 tends to scatter the left and right sides of the float 14. 34 is prevented from being scattered to the side of the float 14.
Therefore, the splash does not hit the rower and does not hinder rowing.

The present invention is not limited only to the above-described embodiment, and can be implemented in the following modified form, for example, without departing from the scope of the claims.
(1) The float 14 is mounted only on the tip of one armband 4 in the rigger 3 and the float 14 is not mounted on the other armband 4.
(2) A vertical piece (not shown) is provided on the float mounting member 12 and is directly fixed to the clutch mounting plate 5 with bolts and nuts 7.

  In the above embodiment, the present invention is mounted on a rowing boat for competition and leisure such as a skull, a double skull, a pair, etc., but it can also be mounted on a hull such as a canoe or kayak.

α Angle of attack γ Diagonal angle θ Downward tilt angle 1 Hull 2 Passenger seat 2a Stretcher 2b Rail 2c Seat 3 Rigger 4 Arms 5 Clutch mounting plate 6 Shaft support 7 Bolt / nut 8 Pivot 8a Bolt 9 Clutch 9a Tube 10 All 11 Clutch pin 12 Float mounting member 12a Hanging piece 13 Nut 14 Boat side float 15 Float support 15a Mounting plate 16 Mounting hole 17 Bolt 17a Knob 18 Mounting hole 19 Nut 20 Pin (Non-rotating means)
21 Bottom 22 Deck 23 Hollow portion 24 Foam 25 Batter plate 26 Bolt 27 Nut 28 Waterproof cover 29 Drain hole 30 Sealing lid 31 Keel 32 Chine 33 Sliding surface 34 Downward projecting portion 34a lower end surface

Claims (6)

A displacement-type hull that runs by rowing oars,
A row boat side float mounted on a rigger that projects to the left and right of the hull, and
The row boat side float is
The bottom has a sliding surface shape having a sliding surface inclined upward from the central keel toward the chine, and provided with a downward protrusion at the outer end of the sliding surface ,
Rowing boat, characterized in that said ol was supported on the upper surface side of the rowing boat side floats. The running surface directed from the keel to the chine, rowing boat of claim 1, wherein the central portion in a front view is a curved surface recessed upward. The lower end surface of the downward projections, inclined surfaces and claims 1 or 2 rowing boat according to downwardly inclined outward from the outer end of the running surface towards the downward protrusion from the keel. Rowing boat as claimed in any one of the chine of downward projection is provided with a thicker than other portions claims 1-3. The bottom of the upper surface, covered by a flat plate-like deck tip is downwardly inclined, rowing boat of claim 4 wherein forming a hollow portion between the bottom and the deck. The bottom angle-of-attack α is 7 ° ± 5 °, the elevation angle γ is 10 ° ± 10 °, and the downward inclination angle θ of the lower end surface of the downward projection is 20 ° to 40 °. rowing boat according to any one of the.

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