JP5351372B2 - Ladder - Google Patents

Description

  The present invention relates to a ladder, and more particularly to a ladder suitable for use in a wall inspection of a ship's hold.

  Under the Marine Life Safety Convention (SOLAS Convention), there are scaffolds, etc. in the hold, which is the cargo area of oil tankers and bulk carriers, for monitoring and early detection of cracks and corrosion damage occurring in the structure inside the hull. It has been newly stipulated that a transportation facility for inspection is installed or a portable facility is installed on the ship for inspection depending on a specific place.

  However, it is not only difficult in terms of structure to provide a fixed scaffold or the like, but it is also a problem in that equipment costs increase. Among them, regarding the inspection requirements for structural members in the cargo hold such as ribs, the use of fixed equipment or portable equipment is obligatory, but the installation of the fixed equipment becomes a hindrance in normal ship operation, so it is portable. The use of facilities is expected.

  Therefore, the present invention intends to solve the above-described problems by using a commercially available ladder.

The ladder of the present invention according to claim 1 is
At least a pair of struts;
In a ladder formed by connecting a plurality of unit ladders having at least one step between these columns,
The unit ladder includes a pair of roller legs on the lower surface side of each ladder,
A hook is provided at the tip of the unit ladder on the front side,
The unit is constructed in a multi-joint shape that can be bent at the connecting part of the ladder so that it can be bent along the wall surface during the wall inspection of the ship's hold,
The top unit ladder includes a ring through which a rope passes through one step,
Hang both ends of the rope through the ring on a rod provided on the wall of the ship's hold,
The other ends of the rope that are hung around are tied to the steps of the ladder, which are located below the unit ladder on the leading side,
When inspecting the wall of the ship's hold, the rope is pulled from below the unit ladder on the leading side, and the entire ladder made up of a plurality of unit ladders configured to be bent in the articulated form is raised along the wall surface. To be able to
It is characterized by that.

According to claim 2,
In the ladder of claim 1,
The connection between the unit ladders fixes the connection struts on the outer sides of the pair of struts,
A pair of through holes are provided in the connecting column,
Through fixing members such as bolts to at least one of the through holes, the unit ladder mutually linked is characterized by comprising a bendable pivot.

According to claim 3
In the ladder of claim 1 ,
Connection between pre SL units ladder, the strut is secured to the outside each of said pair of posts,
A pair of through holes are provided in the connecting column,
Both of the through hole through the fixing members such as bolts, the unit ladder mutually coupled to said Rukoto such a structure which may be a rotating bending impossible.

  The ladder according to the present invention can be constructed at low cost, and has an advantage that it is possible to avoid the necessity of providing a fixed scaffold or the like when used for inspection of a ship.

  Embodiments of a ladder according to the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view (A) and a side view (B) showing an embodiment of a ladder according to the present invention. Reference numerals 1 to 17 in the figure are unit ladders, and for example, most of the members are made of an aluminum mold or the like. The unit ladder 1 on one end side is provided with a hook 20. Each of the unit ladders 1 to 17 includes at least a pair of legs 21 with rollers on the lower surface side.

  FIG. 2 is a plan view (A) and a side view (B) showing unit ladders 2 to 17 other than the unit ladder 1. In the figure, 31 is a support, 32 is a step, 33 is a connection support, 34 is a reinforcing plate, 35 is a wheel unit, 36 is a connection plate, 37 is an end plate, and 38 is a lid.

  The connecting column 33 is provided with a pair of through holes 39 and 40, each of which can be bolted with a bolt 41. That is, if the nut 41 is fastened with a bolt 41 to only one through hole 40 (for each of the pair of columns 31), the unit ladders 2 to 17 and the other unit ladders 2 to 17 (excluding the unit ladder 1 as described later) Can be bent with the bolt 41 passed through the through hole 40 as an axis. Moreover, if the nut 41 is fixed to each of the two through holes 39 and 40 with bolts 41, the unit ladders 2 to 17 and the other unit ladders 2 to 17 can be fixed and cannot be bent.

FIG. 3 is a plan view (A) and a side view (B) showing the unit ladder 1. The main configuration is the same as that of the other unit ladders 2 to 17, but a hook 20 and a leg 21 with a roller are provided at the end. In addition, since it is difficult to use the unit ladder 1 so that the unit ladder 1 can be bent with respect to the other unit ladder 2, it is preferable to fix the unit ladder 1 to the adjacent ladder 2. Note figure 42 a is a ring of rope fixed, are provided on one踏Zan 32.

  With reference to FIG. 4 and FIG. 5, the usage pattern of the ladder of this Example is demonstrated. FIG. 4 is a cross-sectional view showing an example in which a frame is inspected using a ladder according to an embodiment of the present invention in the hold of an oil tanker or a bulk carrier. The unit ladder is 15 pieces. FIG. 5 is a diagram illustrating the movement of the hook during use. In addition, on the wall surface in the hold of the bulk carrier, round bars 42 and 43 are provided in the upper part and in the vicinity of the hopper top and knuckle part, respectively, so that the rope 44 can support the ladder. In the figure, reference numeral 45 denotes a frame protruding within the bulk carrier hold, and 46 denotes a tank top.

  In this embodiment, each of the unit ladders 1 to 7 is fixed through two bolts 41 so that it cannot be bent. This is to prevent the ladder from bending above the hopper top knuckle.

And
(1) A rope 44 is hung on the upper round bar 42 and the knuckle round bar 43 with a scissors or the like (see FIG. 5A),
(2) The end of the rope 44 is tied to the step 2 closest to the round bar of the unit ladder (the seventh unit ladder 7 from the top in the figure) that hangs on the knuckle part,
(3) Pulling the rope 44 and pulling up the ladder with the unit ladder 1 side at the top while using the fact that the rope 44 is hung on the round bar 43 of the knuckle part, the ladder is drawn toward the knuckle part,
(4) After pulling, the rope 44 is connected to the lowest step 2 of the unit ladder (second unit ladder 14 from the bottom in the example shown) that can be reached from the tank top.
(5) The leading unit ladder 1 side rises along the inner wall surface of the hold, and the hook 20 warps along the round bar 42 (see FIG. 5B).
(6) When it further rises along the inner wall surface of the hold, the hook 20 grasps the round bar 42 (see FIG. 5C).
Thus, the operator 50 can perform the inspection work. It should be noted that the top end of the rope 44 needs to be considered so that the pulling rope 44 is positioned at the center of the ladder.

When lowering the ladder of this example,
(1) Open the rope 44 first,
(2) Once the unit ladder 1 is pushed up, the hook 20 is detached from the round bar 42,
(3) After that, take the procedure of slowly lowering the entire ladder onto the tank top 46.

  FIG. 6 is a cross-sectional view showing an example in which a frame is inspected using a ladder according to an embodiment of the present invention in a hold on the stern side of an oil tanker or a bulk carrier, for example. The unit ladder is 17 pieces.

  By changing the number of units to be used in various ways, it can be used more easily, and it is convenient for uses other than inspection of ships and the like.

It is the top view (A) and side view (B) which show one Example of the ladder based on this invention. It is the top view (A) and side view (B) which show unit ladders other than the unit ladder of an edge part. It is the top view (A) and side view (B) which show the unit ladder of an edge part. It is sectional drawing which shows the example which inspects a flame | frame using the ladder which concerns on the Example of this invention within the hold | maintenance of an oil tanker or a bulk carrier. It is a figure which shows the motion of the hook at the time of use. It is sectional drawing which shows the example which inspects a flame | frame using the ladder which concerns on the Example of this invention within the hold | maintenance of the stern side of an oil tanker or a bulk carrier.

Explanation of symbols

1-17 Unit ladder 20 Hook 21 Roller leg 31 Post 32 Stepping 33 Connection post 34 Reinforcement plate 35 Wheel unit 36 Connection plate 37 End plate 38 Lid 39, 40 Through hole 41 Bolt 42 a Ring 42 for fixing the rope 42, 43 Round bar 44 Rope 45 Frame 46 Tank top 50 Worker

Claims (3)

At least a pair of struts;
In a ladder formed by connecting a plurality of unit ladders having at least one step between these columns,
The unit ladder includes a pair of roller legs on the lower surface side of each ladder,
A hook is provided at the tip of the unit ladder on the front side,
The unit is constructed in a multi-joint shape that can be bent at the connecting part of the ladder so that it can be bent along the wall surface during the wall inspection of the ship's hold,
The top unit ladder includes a ring through which a rope passes through one step,
Hang both ends of the rope through the ring on a rod provided on the wall of the ship's hold,
The other ends of the rope that are hung around are tied to the steps of the ladder, which are located below the unit ladder on the leading side,
When inspecting the wall of the ship's hold, the rope is pulled from below the unit ladder on the leading side, and the entire ladder made up of a plurality of unit ladders configured to be bent in the articulated form is raised along the wall surface. To be able to
A ladder characterized by that.
In the ladder of claim 1,
The connection between the unit ladders fixes the connection struts on the outer sides of the pair of struts,
A pair of through holes are provided in the connecting column,
Through fixing members such as bolts to at least one of the through holes, ladder the unit ladder mutually linked is characterized by comprising a bendable pivot. In the ladder of claim 1 ,
Connection between pre SL units ladder, the strut is secured to the outside each of said pair of posts,
A pair of through holes are provided in the connecting column,
Through fixing members such as bolts to both of the through holes, ladder the unit ladder mutually coupled to said Rukoto such a structure which may be a rotating bending impossible.