JPS5924635Y2 - Device to prevent rope from wrapping around propeller shaft - Google Patents

Description

[Detailed description of the invention] This invention is a rope winding system that is installed between the stern frame boss part and the propeller boss part of a ship to prevent ropes and similar string-like members from being wrapped directly around the propeller shaft. This invention relates to a sticking prevention device.

In general ships that use propellers (screws) as propulsion devices, fishing nets and other underwater or floating ropes and similar string-like members (hereinafter collectively referred to as ropes) are hooked onto the propeller and wound around the propeller shaft. It may stick.

This wrapping of the rope not only reduces the propulsion force, but also inhibits lubrication on ships where the propeller shaft is lubricated with seawater, causing abnormal wear on the lignum vitreous bearings, rubber bearings, etc. It can also make navigation impossible.

Conventionally, as soon as a rope is wrapped around the propeller shaft, a sailor goes into the sea and cuts the wrapped rope. However, the cutting process takes time, and depending on the weather, temperature, and other conditions, the rope may be cut. may involve great danger.

For this reason, a cutting blade is placed on the outer periphery of the propeller shaft, and the rope is cut using the winding force of the rope itself that wraps around the propeller shaft.
As seen in the publication, the free ends of the rope guards are stacked concentrically around the outer periphery of the propeller boss, and a ring made of a strong metal or non-metallic material that is resistant to corrosion and wear is provided between them. It has been considered that the rope can be blocked by blocking the gap between the rope guard and the rope guard to prevent the rope from directly wrapping around the propeller shaft. In the case of the latter, the rope is often forced to pass through the gap between the rope guard and the propeller boss and wind around the propeller shaft, and both are not very perfect.

In the latter case, the rope gets wedged between the propeller boss and the rope guard with an unimaginably strong force, but this is because the gap opens in the axial direction of the propeller shaft. Once the rope is wrapped around the propeller boss, as the propeller boss rotates,
It was discovered that the cause was that the rope gradually moved in the axial direction on the outer circumferential surface of the propeller boss just like a screw, and based on this knowledge, it was possible to wind the rope directly around the propeller shaft. An object of the present invention is to provide a rope wrapping prevention device that can completely prevent rope wrapping.

This invention will be explained in detail below based on the drawings.

Figures 1 to 4 show an embodiment of this invention, and 1 is a hull.

A stern frame boss 2 is provided at the tail of the hull 1, as is customary, to rotatably support a propeller shaft 3 and to which a truncated conical rope guard 4 is fixed.

As is well known, the rope guard 4 is provided concentrically surrounding the propeller shaft 3 and prevents the rope from directly wrapping around the propeller shaft 3. The free end is positioned at the portion shown in FIG.

Reference numeral 7 denotes a bracket fixed to the outer peripheral surface of the rope guard 4 by means such as welding, and is fixed to the protruding piece 8 of the stun frame boss portion 2 with a fixing bolt 9 to secure the rope guard 4 to the stun frame boss portion 2. Strengthens adhesion.

An annular guide ring 10 is fixed to the free end of the rope guard 4 with the propeller shaft 3 at its center, also by means such as welding.

The guide ring 10 and the free end of the rope guard 4 face the propeller boss portion 5 in the axial direction of the propeller shaft 3.

On the other hand, in the propeller boss portion 5, a retaining ring 12 having a retaining groove 11 along the periphery that opens in the direction of the central axis of the propeller shaft 3 is provided, with the retaining groove 11 facing the guide ring 10, and the fixing bolt 13 It is attached by.

This retaining ring 12 is formed by connecting half-holes 14 and 14 (FIG. 4) in an annular shape with an assembly bolt 15, and an annular elastic body 16 made of rubber or a material with the same effect as the guide non-glue provided on the rope guard 4. 10 is brought into elastic contact with an appropriate pressure, and is fixed in the fixing groove 11 with an adhesive or the like.

Reference numeral 17 designates a water intake hole bored in the rope guard 4, and is covered with a cover 17a that is open at one end.

18 is a protective zinc fixed inside the rope guard 4.

The gist of this invention is the configuration of the elastic body 16 and the guide ring 10, and when the propeller shaft 3 is rotated, the end surface of one side (the right side in FIG. 2) comes into elastic contact with the end surface of the guide tongue 10. The elastic body 16 rotates along the end surface of the guide ring 10.

In this case, the elastic body 16 expands and contracts to follow the movement of the propeller shaft 3 in the radial or axial direction, and constantly contacts the guide ring 10 to rotate together with the propeller shaft 3.

Therefore, even if the rope wraps around the rope guard 4 or the propeller (not shown) and comes to the free end of the rope guard and the propeller boss 5, the rope will wrap around the entire circumference of the elastic body 16. In most cases, the rope does not wrap uniformly, but rather crosses the elastic body 16 diagonally, and moreover, the rope moves in the axial direction of the propeller boss and bites into the gap that opens in the axial direction of the propeller shaft. Unlike the conventional one, it does not generate a large biting force, so there is no chance that it will get in the way of the elastic body 16 and get inside the rope guard 4.

FIG. 5 shows an embodiment of another invention, in which a retaining ring 12 having a retaining groove 11 is fixed to the free end of the rope guard 4 by means such as welding, and a propeller An elastic body 16 is brought into elastic contact with an annular guide surface (guide ring) 10 formed on the end surface of the boss portion 5 with an appropriate pressure, and is fixed in the fixing groove 11 with an adhesive or the like.

The other parts of this example are the same as those shown in FIGS. 1 to 4, so the same reference numerals are given and the explanation thereof will be omitted.

In this example, the guide ring 10 rotates relative to the elastic body 16 fixed to the hull 1 side, but even in this case, the elastic body 16 expands and contracts to follow the movement of the propeller boss portion 5. Since the space between the rope guard 4 and the propeller boss portion 5 is sealed, the rope does not enter the lobe guide 4 and wrap around the propeller shaft 3 as in the case of FIGS. 1 to 4.

As explained above, in the winding prevention device of this invention, the elastic body 16 is provided between the end faces of the rope guard 4 and the propeller boss portion 5, and expands and contracts with the movement of the propeller shaft 3 in the radial direction and axial direction. Since the rope follows the rope guard and maintains the seal between the rope guard 4 and the propeller boss portion 5, the rope does not enter the inside of the rope guard and wind directly around the propeller shaft 3.

Moreover, the rope does not wrap around the entire circumference of the elastic body 16 uniformly, but rather crosses the elastic body 16 diagonally; Because it is in elastic contact with the propeller shaft 3 in the axial direction, it does not receive the strong biting force of the rope.
This further prevents the rope from wrapping around the propeller shaft.

Moreover, the structure is simple, and the conventional rope guard can be used as is or after being processed appropriately, so it can be easily implemented not only in newly built ships but also in existing ships.

[Brief explanation of drawings]

The drawings show an embodiment of this invention, in which Fig. 1 is a side view of the winding prevention device according to this invention, Fig. 2 is a longitudinal sectional view,
Figure 3 is a sectional view along the (III-III) barrier in Figure 1;
FIG. 4 is a front view of the retaining ring, and FIG. 5 is a longitudinal sectional view of another embodiment. 2... Stun frame boss part, 3...
Propeller shaft, 4... Rope guard, 5...
...Propeller boss section, 10...Guide ring,
16...Elastic body.

Claims (1)

[Scope of utility model registration request] A rope guard 4 concentrically surrounds the propeller shaft 3 on a stern frame boss portion 2 that rotatably supports the propeller shaft 3, and a free end is attached to a portion of the propeller boss portion 5 attached to the propeller shaft 3. In a device for preventing a rope from wrapping around a propeller shaft that is positioned and fixed, the free end of the rope guard 4 and the propeller shaft 3 are attached to the free end of the rope guard 4.
An annular guide ring 10 is provided around the propeller shaft 3 on either one of the propeller boss parts 5 facing in the axial direction, and a retaining ring 12 having a retaining groove 11 is provided on the other end. is provided around the propeller shaft 3 so as to be oriented in the direction of the central axis of the propeller shaft 3, and an annular elastic body 16 is provided in the retaining groove 11 of the retaining ring 12 so that one end surface is attached to the end surface of the guide ring 10. A device for winding a rope around a propeller shaft, characterized in that the device is attached in a compressive abutment manner.