JPH0211490A - Under water ladder for boat - Google Patents

Abstract

PURPOSE:To facilitate riding onto a boat from the under-water by connecting a ladder main boat to the boat so that it may run only around a rotational axis parallel to its side, and maintaining the body vertical to the boat even if the boat is inclined when a user is on the body. CONSTITUTION:A ladder main body A has a plurality of lateral rods extending laterally and connected thereto between a pair of right and left columns 1, 2 extending in the vertical direction. The rod 3 is bent in a recessed form such that the central part is recessed rather than the opposed ends. The columns 1, 2 and the rod 3 are made of aluminum pipes and are given with float by closing the opposed ends. A mounting member 6 is connected to the upper end of one 1 of the columns via a hinge 7, while the connection pin 8 arranged at the lower face of the member 6 is inserted into a through hole 5 for insertion of an oar support pin bored at a frame member 45 of a boat B. It is thus possible to maintain the body vertically even if the boat B is inclined.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This is an invention for a ladder used to climb onto a boat from the water.

(Prior Art) It is surprisingly difficult to board a boat from the water, especially when you are wearing equipment such as an air tank.

This difficulty can be alleviated by lowering a ladder into the water from the side of the boat and securing the top end to the boat.

However, if the left and right supports of ladder A are fixed to the side of boat B, as shown in Figure 9.

This is because the weight of ladder A tilts together with boat B.

The person on ladder a is in an upward position, making it extremely difficult to climb up.

(Problems to be Solved by the Invention) An object of the present invention is to maintain a ladder in a vertical position even if the boat is tilted due to the weight of the boat, thereby making it easier to board the boat.

(Means for Solving the Problems) In the present invention, the ladder is attached to the boat so that the horizontal bar of the ladder is perpendicular to the side of the boat.

In other words, only one of the left and right struts of the ladder is attached to the boat, and that strut is attached so that it can rotate only around an axis of rotation parallel to the ship's side.

(Function) When you put your weight on the ladder, the ladder sinks and the boat tilts.
However, since the ladder rotates around an axis of rotation parallel to the boat's side, even if the boat tilts, the ladder will not tilt and will remain vertical.

Additionally, since the ladder only rotates around the aforementioned axis of rotation and not in the longitudinal direction of the boat, this, combined with the longitudinal stability of the boat, prevents the ladder from tipping forward or backward. and keep it well vertical.

(Example) In Figures 1 and 2, A is the ladder body, and B is the boat.

The ladder main body A is placed between a pair of left and right vertical supports of 1°2.
It is constructed by connecting a plurality of horizontal horizontal bars 3.

The horizontal bar 3 is bent into six shapes so that its center is lower than both ends. When the horizontal bar 3 is bent in this way, the boat B
Even if the main body A of the ladder sways from side to side due to the horizontal shaking of the ladder, the foot resting on the horizontal bar 3 remains stable in the center of the 6-shape, reducing the risk of slipping down.

The pillars 1.2 and horizontal bar 3 of the ladder body A are made of aluminum pipes, and if the end of the vibrator is closed and the inside is sealed, it will create buoyancy and will not sink even if the ladder body A is accidentally dropped into the water. It has the advantage of being easily recoverable.

Figure 3 (a) and (b) show ladder body A and boat B.
FIG. Reference numeral 4 indicates a frame material along the upper edge of the ship's side, and reference numeral 5 indicates a through hole for inserting an oar support pin that passes through the frame member 4 in the longitudinal direction. When the ladder is not attached, a support pin (not shown) that serves as a fulcrum for the oar is inserted through the through hole 5.

Reference numeral 6 denotes a mounting member connected to the upper end of the support column 1 via a hinge 7 so as to rotate on a plane including the support columns 1 and 2, and a connecting pin 8 is installed on the lower surface of the attachment member.

The lower end of the connecting pin 8 is made bendable in the right angle direction.

After the connecting pin 8 is inserted into the through hole 5 and the mounting member 6 is fitted to the outer periphery of the frame material 4, the lower end of the connecting pin 8 is bent at a right angle to fix it in place (Fig. 3(b)), the ladder body A.
Connect to boat B.

In this connected state, ladder body A is connected to boat B.
It is possible to rotate only around the axis of rotation (axis of the hinge 7) parallel to the ship's side.

Therefore, when a person gets on the ladder body A, the boat B tilts due to his/her weight, but the ladder body A rotates relative to the boat B and does not sink in the direction of the load, that is, directly downwards (FIG. 4).

In addition, the weight of one person on the ladder body A is biased towards the side on which one person is standing, that is, towards the side of the ladder (H).
Ladder main body A does not tilt in its length direction relative to boat B, and boat B does not easily tilt in its length direction, so ladder main body A does not tilt upward even when a person gets on it.

If the ladder is not used, place the tip of the ladder body A directly above it as shown in Figure 5. If the ladder main body A is brought out above the water surface in this way, there is no problem with the running of the boat B.

FIG. 6 shows an embodiment in which two hinges 7 are interposed in parallel between the pillar 1 of the ladder body and the mounting member 6.
．． 7 absorbs the tilt of the boat B, making the ladder body A even more stable.

FIG. 7 shows another embodiment of the mounting member 6, which is fixed to the frame member 4 with a port 9 instead of the connecting pin 8.

FIG. 8 shows another embodiment of the ladder body A, in which the upper ends of the columns 1.2 are integrally connected by a chevron-shaped frame. By holding this chevron-shaped part with your hand, you can safely transfer from the ladder main body A to the boat B.

(Effects of the Invention) In short, according to the present invention, the ladder body is connected to the boat so that it rotates only around the axis of rotation parallel to the ship's side, so even if the boat tilts while riding on the ladder, the ladder body will not tilt. Since the ladder is vertical, you can easily climb the ladder without tilting your body upwards, and you can board the boat from the water without any problems.

Furthermore, since the horizontal bar of the ladder body is located perpendicular to the side of the boat, even when climbing the ladder with flippers on, the flippers will not come in contact with the boat and get in the way.

The underwater ladder of this invention is particularly suitable for multi-person lifesaving aluminum boats and is convenient for use by heavily armed rescuers wearing tanks and flippers, but it can also be used for leisure purposes. Needless to say.

[Brief explanation of the drawing]

1 is a front view of an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3(a) is an enlarged sectional view of the main part, FIG. , 5 is a front view explaining the state of use, FIGS. 6 and 7 are enlarged sectional views of main parts of different embodiments, FIG. 8 is a front view of another embodiment of the ladder body, and FIG.
The figure is a diagram of a conventional example. l, 2 is the support, 3 is the horizontal bar, 4 is the frame material, 6 is the mounting member, 7 is the hinge, A is the ladder body, and B is the boat. Application: Toshibe Toshibe, Maki, Tomita Iron Works Co., Ltd. (and 3 other people) Fig.

Claims (1)

[Claims] 1. A ladder body is constructed by connecting a plurality of horizontal horizontal bars between a pair of left and right vertical supports, and these horizontal bars are positioned perpendicular to the side of the boat. and an underwater ladder for a boat, the upper part of either the left or right support being connected to the upper edge of the gunwale so as to be rotatable only around a rotational axis parallel to the gunwale. 2. An underwater ladder for boats according to claim 1, wherein the central part of the horizontal bar of the ladder body is bent into a valley shape so as to be lower than both left and right ends thereof. 3. An underwater ladder for boats, wherein the support and crossbar of the ladder body according to claim 1 are formed of sealed aluminum pipes.