JPS6150878B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a davit device that can be applied to all kinds of cargo handling davits for ships and land, and davits (davits for gangways) used in various equipment for ships and land.

The arm a of a conventional general-purpose davit has an inverted J-shape welded sheet metal structure as shown in Fig. 5, and the lower straight part is held by a cylindrical stand b.
Because it was structured to be rotated by guy ropes, the entire structure was heavy and required a lot of man-hours to manufacture. Furthermore, the rotating and sliding parts of stand b and arm a, which are the centers of rotation, have large radii, require large turning forces, and often become difficult to turn due to rust or the like.

Furthermore, when lubricating or replacing the pulley d attached to the top of the arm a, a person has no choice but to approach the pulley d via the step e attached to the back of the curved part of the arm, making the work extremely dangerous. was. Furthermore, when the davit body is equipped with the drive device f, in order to prevent the suspension rope from interfering with the swing, the drive device f is often attached to the arm that rotates, and as the arm a swings, the operator It was necessary to change the position and posture of the body, and there were often restrictions on placement.

In particular, when the arm a is attached to the side of a ship and is moved into the inside of the ship, the drive unit f is swung out overboard and becomes inoperable. In addition, the arm a of the swivel part has a structure that allows it to swivel 360 degrees, but in reality it is obstructed by the hanging rope and requires even greater turning force, so it can only be rotated within a very narrow range. It was only used in Note that g is cargo total.

The present invention was proposed in order to solve the above-mentioned conventional drawbacks, and by forming the arms and stays in a shape that generates only simple compressive and tensile stresses, it is possible to create a light structure made of steel pipes or the like. It is easy to manufacture, and the overall weight can be reduced to about half of the conventional type.The center of rotation of the arm is a small diameter pin, which significantly reduces the force required for rotation operation, making it suitable for cargo handling with small loads. , the arm can be turned by directly operating the handle attached to the arm by hand, and the arm can be tilted down using a pulley and cargo floor.
It is an object of the present invention to provide a davit device that allows safe maintenance and inspection of the pulley at the top.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention.
1 indicates a davit column, which can be installed either fixedly or removably as required. Reference numeral 1a denotes an arm bracket, which is mounted midway on the davit column 1 at a height that can be reached from the installation surface. 1
b is a stay bracket, which is fixed almost to the top of the davit column 1;

Reference numeral 2 indicates an arm, and the lower end is a swing bracket 2 attached to the arm bracket 1a for free rotation.
a and an arm pin 2b so that it can be moved up and down freely and removably. 3 indicates a stay, one end of which is rotatably and removably connected to a stay bracket 1b and a stay pin 3a, and the other end is connected to the top of the arm 2.

Reference numeral 5 indicates a gooseneck bracket, which has the pivot center of the pivot bracket 2a, and which has the pivot center of the pivot bracket 2a.
The arm bracket 1a is connected to the arm bracket 1a in a fixed and detachable manner in the rotating direction, and to the arm bracket 1a in a freely pivotable and detachable manner. Further, the gooseneck bracket 5 has a pulley 5a at its lower end, which is attached so that the center of the passing rope in the horizontal section is the same as the center of rotation of the gooseneck bracket 5. Reference numeral 6 denotes a pulley for a suspension rope, which is fixed to the davit column 1 so that the center of the suspension rope passing therethrough in a horizontal section is the same as the center of rotation of the gooseneck bracket 5.

7 is a double pulley, which is fixed on the davit pillar 1. 2c is a notched pulley, which is attached to the back of the arm 2. A lifting pulley 4 is fixedly or removably attached to the top of the arm 2.
Reference numeral 8 indicates a suspension line, which is wound around the drum of a winch 10 fixed to the davit column 1, or another winch, or is operated by a manual winch, and includes a suspension rope pulley 6, a pulley 5a with a gooseneck bracket 5, and a lifting rope. It is led on pulley 4. 9 are fixed on the davit pillar 1 at equal intervals with steps.

Figure 2 shows a plan view of the entire Davit device, with 1
Reference numeral 1 designates an arm turning handle which has a required number of arm supporting stoppers 11a and is connected to a stopper bracket 12 fixed to the davit column 1 as necessary. In addition, the handle 11 is attached to a rotating bracket 2.
A is fixed by brackets 11b, 11b in the manner shown in the detailed view of the swing bracket in FIG. 4, and is provided in consideration of ensuring the swing angle θ. Also, the guy rope 13 can be attached to the arm 2 as needed.
is attached to connect the top of the body to another rigid body.

Next, the effect will be explained. First, when a load is applied to the tip of the hanging rope 8, a compressive force is applied to the arm 2 via the pulley 4.
A tensile force acts on the stay 3 and a bending force acts on the davit column 1, and the brackets and pins at each base withstand it.

By operating the guy rope 13 or the handle 11, the arm 2 and the stay 3 rotate within the range of the rotation angle θ shown in FIG. 2 on the rotation centers of the arm bracket 1a and the stay bracket 1b, respectively, and carry out the required cargo handling. do the work. Also, an arm support stopper 11a on the handle,
and stopper bracket 1 on davit column 1.
By connecting the arms 2, the arm 2 can be fixed at any position.

When maintenance or inspection of the pulley at the end of the arm is required, with the end of the sling 8 fixed near the base of the arm 2, move the sling on the winch side from the sling pulley 6 as shown in Fig. 3. Then, the stay 3 is separated from the stay bracket 1b by leading on the double pulley 7 and the notched pulley 2c, and by pulling it from the winch side, the arm 2 is pulled in the direction of the davit pillar 1 around the arm pin 2b, and the It is defeated by loosening it. At this time, since the notched pulley 2c is located on the back side of the arm, that is, on the side of the davit column 1, even if it receives a tensile force, the force does not twist the arm.

A step 9 fixed to the davit post 1 can be used to access the stay 3 and lead the suspension rope.
In addition, in normal cargo handling conditions, the sling 8 is led coaxially with the center of rotation of the arm 2 between the pulley 5a with the gooseneck bracket 5 and the sling pulley 6, so that the sling 8 is guided coaxially with the center of rotation of the arm 2. Tension does not work.

Since the present invention is constructed as described in detail above, the turning angle θ can be increased by moving the turning centers of the arm and stay away from the davit pillar, as shown in FIG. etc., it can fully serve its purpose within 200 degrees, and the pin has a small diameter enough to support the force acting on the arm and stay, so the rotation angle required for the rotation operation is small enough to support the force acting on the arm and stay. The force is small. Therefore, the handle fixed to the arm can be easily rotated. The arm can be fixed in any direction within the swing range by appropriately selecting the number and position of arm-supporting stoppers on the handle. In addition, a double pulley and a notched pulley were installed on the davit pillar and arm, so
By hooking the sling from the winch through the double pulley to the notched pulley, then hooking it to the double pulley and then to the sling pulley, disconnecting the stay from the stay bracket, loosening the sling from the winch side and folding the arm. You can easily maintain and inspect the pulley at the end of the arm, and if you simply remove the lifting pulley, fix the end of the sling rope near the arm base, raise the arm, and connect the stay base, double pulley and By removing the suspension rope from the notched pulley, the suspension rope and lifting pulley can be completely separated from the davit and stored in a store or the like. In addition, the restoration of the hanging rope is carried out in the reverse order of the above. The arm and stay can also be removed and stored in the same manner, which is particularly effective for davits used in locations susceptible to wave damage.

On the other hand, when the arm is raised and lowered, the arm is not subjected to torsional force, so it is easy to attach and detach the pin at the base. In addition, since the stay and arm are shaped so that only simple tensile and compressive forces act on them due to the load on the suspension rope, they can be made of light structures such as steel pipes, and the swivel pins and brackets Since the davit column can only withstand the load and can be made smaller, the davit column can also have a simple structure such that steel pipes can be used as is. Therefore, the weight of the entire davit device can be reduced to about half that of the conventional type.

In addition, when equipped with a dedicated winch, the hanging rope does not interfere with turning as mentioned above, so it can be fixed to the davit column and can be operated from a fixed position regardless of the direction of the arm. . Furthermore, since the air pipe for supplying the driving source or the electric circuit can be fixed and lead, it is effective in terms of durability and wave resistance.

[Brief explanation of the drawing]

Figure 1 is a side view of a davit device showing an embodiment of the present invention, Figure 2 is a plan view of the same, Figure 3 is a detailed view of the main parts in Figure 1 in different operating states, and Figure 4. 1 is an exploded perspective detailed view of the main parts in FIG. 1, and FIG. 5 is a perspective view showing an example of a conventional davit device. Explanation of the main parts of the diagram, 1... Davit pillar, 1a
...Arm bracket, 1b...Stay bracket, 2...Arm, 2a...Swivel bracket, 2b...Arm pin, 3...Stay, 3a
...Stay pin, 4... Lifting pulley, 5a... Pulley with gooseneck bracket, 5... Gooseneck bracket, 6... Pulley for suspension rope, 8... Suspension rope,
10... winch, 8... suspension rope, 10... winch (hoisting device).

Claims (1)

[Claims] 1. A davit column that has an arm bracket attached to the middle part and a stay bracket attached to the top, and is fixed or removably provided on the installation surface, and is attached to the arm bracket so as to be freely pivotable. an arm whose lower end is freely connected to the swing bracket via a pin; a stay whose one end is pivotally connected to the stay bracket and the other end is connected to the top of the arm; and a stay fixed to the swing bracket. a winch provided on the davit column or installation surface, a lifting pulley attached to the top of the arm, a gooseneck bracket that is freely pivotable on the pivot center line of the pivot bracket and has a pulley at the lower end. , a suspension rope pulley provided on an extension line of the pivot center of the gooseneck bracket of the davit column, one end of which is wound around the winch, and the other end of which is the suspension rope pulley, a pulley with a gooseneck bracket, and a lifting pulley. a cargo floor that engages with a pulley attached to the tip of the arm and is capable of collapsing the arm, a double pulley fixed to the upper part of the davit pillar, and a suspension rope guided through the Attached to the back of the arm, which is hung through a double pulley and can be pulled up or down by separating the stay from the stay bracket and pulling or loosening the suspension rope from the winch side. A davit device comprising a notched pulley.