JP4329949B2 - Shock absorber - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shock absorber that is used by being connected to a mooring line of a floating body that floats on the sea surface, and relates to a shock absorber that can safely moor a floating body by relaxing motion response in waves.
[0002]
[Prior art]
Conventionally, a mooring line having an elastic elongation is used for mooring a floating body floating on the water surface or in water. One such mooring line is a rubber chain. In this rubber chain, a large number of linked annular links are embedded in rubber by filling the inside and outside of the links in a relaxed state. Several structures have been proposed for such a rubber chain depending on the state of relaxation of the annular link.
[0003]
The rubber chain of any structure resists the tensile load by first compressing the rubber filled in the link, and also acts as a buffer by this amount of compression. When the tensile load is released, the original shape is restored by the restoring force of the rubber. The rubber chain can relieve the motion response in the waves by the buffering action as described above.
[0004]
[Problems to be solved by the invention]
However, the rubber chain has the following problems. That is, the deformation amount per unit length is extremely small because the deformation is only caused by the compression of the rubber filled between the links with respect to the tensile load. Therefore, there is a problem that it is not always sufficient to relax the motion response in the waves. Further, the rubber filled in the link is damaged in a short period of time by repeating compression and relaxation, and cannot function as a rubber chain.
[0005]
Further, the rubber filled in the link is not only damaged by repeated compression, but also when subjected to a sudden high load, it is strongly pressed by the links and may be easily damaged. In addition to the fact that the amount of deformation per unit length is extremely small and the durability is inferior, as described above, there is a problem that the manufacturing is troublesome and expensive.
[0006]
The present invention has been made in view of the present situation, and an object of the present invention is to provide a shock absorber that has a large amount of deformation per unit length, is easy to mount, and can be used safely.
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as follows. That is, the shock absorber according to the present invention includes a buffer body made of a columnar rubber body that is elastically deformed and a safety cable, and the buffer body is made of at least one columnar rubber body, and the length dimension of the normal rubber body. Is attached to an embedded bracket embedded in a bulging end portion in which both end portions of the columnar rubber body are bulged, and the safety cable is a buffer body. is formed to a length corresponding to the elongation and, characterized by comprising fixing the both ends in the mounting bracket attached to both ends of the buffer body. The buffer may be formed from a single columnar rubber body, a plurality of columnar rubber bodies may be connected in series, or a plurality of columnar rubber bodies may be arranged in parallel .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. First, FIG. 1 is an explanatory front view of the entire device, partly in section, FIG. 2 is an explanatory longitudinal sectional view of the shock absorber, and FIG. 3 is a front view of the mounting bracket. The shock absorber K according to the present invention includes a shock absorber 1 that relaxes the motion response in waves by elastic deformation, and a safety cord 3 attached to the shock absorber.
[0009]
The shock absorber 1 includes a columnar rubber body 11 that is elastically deformed and mounting brackets 13 and 13 attached to the end portions 12 and 12, and the mounting bracket 13 is an end that bulges the end portion of the columnar rubber body 11. It is attached to the embedded metal fitting 14 embedded in the portions 12 and 12 with the end faces exposed. The columnar rubber body 11 can be formed of a rubber-like elastic body such as natural rubber, synthetic rubber, and thermoplastic elastomer. These rubber-like elastic bodies may be one kind or a mixture of two or more kinds. In addition, short fibers can also be mixed.
[0010]
It is preferable that the columnar rubber body 11 bulges only the end portions 12 and 12 in which the embedded metal fitting 14 is embedded, and the length dimension can be 3 to 10 times the central body diameter dimension. As will be described later, the ratio of the length dimension to the central body diameter dimension is appropriately determined depending on whether the columnar rubber body 11 is used alone or a plurality of columnar rubber bodies 11 are connected in series or in parallel. be able to. The elongation percentage of the columnar rubber body 11 can be set to 200 to 600%, for example.
[0011]
The embedded metal fitting 14 is provided with a female screw 14 a for screwing the attachment metal fitting 13. Further, a protective layer 15 is preferably provided on the outer peripheral surface of the columnar rubber body 11. When the protective layer 15 is provided, it is possible to prevent the columnar rubber body 11 from being damaged during transportation, installation work in water, or use in water. The protective layer 15 can be formed by covering a rubber sheet, a plastic sheet, a cloth, a metal plate, or the like. In the case of a non-extensible cloth, a metal plate, or the like, the protective layer 15 is fixed to the columnar rubber body 11. It can be simply covered and slidable.
[0012]
The mounting bracket 13 includes an annular portion 13a and a fixing portion 13b, and a male screw 13c is engraved on the outer peripheral surface of the fixing portion 13b so as to be screwed into the female screw 14a of the embedded fitting 14. The mounting bracket 13 and the embedded bracket 14 may be fixed by welding, bonding, or the like without being screwed as in the above embodiment.
[0013]
The safety cable 3 attached to the attachment bracket 13 can be formed by a rope, a chain, a rubber chain, or the like, and both ends are attached via attachment rings 4 attached to the attachment bracket 13. Since the safety cable 3 becomes a mooring cable when the buffer body 1 is broken, the length of the safety cable 3 may be adjusted according to the elongation rate of the columnar rubber body 11. Moreover, it is preferable that the strength of the safety cable 3 is comparable to that of the mooring cable. The safety rope 3 includes a safety device in addition to a single piece such as a rope.
[0014]
In the above embodiment, the case where the columnar rubber body 11 is used alone has been described. However, the columnar rubber body 11 may be connected in series to form a buffer body. That is, the plurality of columnar rubber bodies 11 are connected in series via the mounting bracket 13, and the safety cord 3 is attached to both ends of the buffer body formed by connecting these columnar rubber bodies 11. Thus, when the columnar rubber bodies 11 are connected in series, the amount of extension can be increased accordingly. This is effective when high displacement is required. The length of the safety cord 3 in this case may be a length corresponding to the total extension amount of the columnar rubber body constituting the buffer body.
[0015]
The columnar rubber bodies 11 are connected in series as described above, and when a high tension is required, a buffer body can be formed by arranging a plurality of columnar rubber bodies 11 in parallel. Moreover, when a high displacement amount and high tension are required, columnar rubber bodies connected in series can be arranged in parallel. 4 to 6 show the shock absorber 1a when three columnar rubber bodies 11 are arranged in parallel. The shock absorber 1a has the embedded metal fittings 14 and 14 embedded in the end portions 12 and 12 of the columnar rubber body 11 in contact with the inner surfaces of the mounting metal fittings 5 and 5, and the bolts 51 are screwed into the female screws 14a of the embedded metal fittings 14. Thus, the safety bar 55 that replaces the safety cable 3 is slidably disposed.
[0016]
The mounting bracket 5 has a connecting plate 53 standing vertically on a circular plate 52 formed by alternately drilling through holes 54 and 54 through which bolts 51 and 51 are inserted and through holes 56 and 56 through which a safety bar 55 is inserted. The embedded metal fittings 14 and 14 embedded in the end portions 12 and 12 of the columnar rubber body 11 are brought into contact with the disc 52 and the bolts 51 and 51 are inserted into the through holes 54 and 54 and embedded. The metal screw 14a of the metal fitting 14 is screwed and fixed. On the other hand, the safety bar 55 is inserted into the through holes 56 of the disc 52, and nuts are attached to both ends so as not to drop off.
[0017]
The length of the safety bar 55 may be determined by the elongation rate of the columnar rubber body 11. The safety cord 3 in the above embodiment can be used in place of the safety bar 55. The buffer body 1a only needs to have a plurality of columnar rubber bodies 11 arranged in parallel, and when higher tension is required, the buffer body 1a itself may be arranged in parallel. A plurality of the buffer bodies 1a can be connected in series. Thus, when the buffer body is formed by combining the columnar rubber bodies 11 in parallel and in series, the demand for high tension and the demand for high displacement can be met.
[0018]
Next, the case where the buffer device according to the present invention is used for the marine pollution prevention film will be described with reference to FIGS. In FIG. 7, a curtain 61 is attached to and suspended from a floating body 60, a weight 62 is attached to the lower end of the curtain 61, and a shock absorber K according to the present invention is attached to the upper end of the curtain 61 via a connecting line 63. The other end of K is attached to the buffer floating body 63 via a connecting line 64. An upper end of a mooring line 65 is attached to the buffer floating body 63, and a lower end of the mooring line 65 is connected to an anchor 66 installed on the seabed.
[0019]
As described above, when the shock absorber K is used for the marine pollution prevention film, the motion response in the wave of the curtain 61 can be reduced by the expansion of the buffer body 1 along with the shaking of the buffer floating body 63. When the shock absorber 1 is damaged due to an unexpected event, the safety cable 3 is activated to prevent the curtain 61 from flowing.
[0020]
FIG. 8 shows a case where the buffer body 1 is interposed at an appropriate position of the mooring line. That is, a curtain 69 with a weight 68 attached to the lower end is suspended from the floating body 67, and an upper end of a mooring line 71 with the lower end connected to the anchor 70 is attached. A shock absorber K according to the present invention is attached to an arbitrary position of the mooring line 71.
[0021]
In the above use example, the shock absorber constituting the shock absorber has been described with respect to the case where the columnar rubber body 11 is used alone. However, as described above, the shock absorber may be configured to be connected in series or in parallel. Those connected to each other may be arranged in parallel.
[0022]
【The invention's effect】
As described above, according to the shock absorber of the present invention, the motion response of the floating body can be relaxed, and the initial tension of the mooring line can be dealt with by elastic deformation of rubber. In addition, the amount of deformation per unit length is extremely large, it can withstand high tension by attaching columnar rubber bodies in parallel, and it can meet the demand for high deformation amount by attaching columnar rubber bodies in series. it can.
[Brief description of the drawings]
FIG. 1 is an explanatory front view of an entire apparatus, partly in section.
FIG. 2 is a longitudinal sectional view for explaining a shock absorber.
FIG. 3 is a front view of the mounting bracket. FIG. 4 is a front view of a part of the embodiment in which columnar rubber bodies are attached in parallel.
FIG. 5 is a side view of the same.
FIG. 6 is a perspective view of a mounting bracket. FIG. 7 is an explanatory side view showing an example of use for a marine pollution control film.
FIG. 8 is an explanatory side view showing another example of use for a marine pollution control film.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 1a Buffer 3 Safety rope 4 Attachment ring 5 Attachment metal 11 Column-shaped rubber body 12 End part 13 Attachment metal 13a Annular part 13b Adhering part 13c Male screw 14 Embedded metal fitting 14a Female screw 15 Protective layer 51 Bolt 52 Disc 53 Connection board Through hole 55 Safety bar 56 Through hole

Claims (4)

It consists of a buffer body consisting of a columnar rubber body that elastically deforms and a safety cable, and the buffer body is composed of at least one columnar rubber body, and the length dimension of the cylindrical rubber body is 3 to 3 times the diameter of the central trunk section. 10 times, and mounting brackets are attached to embedded brackets embedded in the bulging end portions where both end portions of the columnar rubber body are bulged, and the safety cable has a length corresponding to the elongation rate of the buffer body. is formed, a buffer apparatus characterized by comprising fixed to a mounting bracket attached to both ends of the buffer body and the both end portions.   The shock absorber according to claim 1, wherein the shock absorber is composed of one columnar rubber body.   The shock absorber according to claim 1, wherein the shock absorber is formed by connecting a plurality of columnar rubber bodies in series.   The shock absorber according to claim 1, wherein the shock absorber comprises a plurality of columnar rubber bodies arranged in parallel.

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