JPH02270694A - Manufacture of float - Google Patents

Abstract

PURPOSE:To improve the airtightness for a joined article by carrying out the high frequency fusion by superposing a plurality of float cloth and nipping a groove formed on the top part by electrodes from inside and outside and fusing the peripheral part of the groove and forming the top part into flat plane. CONSTITUTION:In the manufacture, the inner surfaces of the side parts of a plurality of cloth 2a and 2b corresponding to the top part of a float 2 are superposed, and the superposed parts are nipped by arranging the superposed part between a plurality of electrodes 6 and 7. Then, high frequency electric current is allowed to flow in the electrodes 6 and 7, and each part nipped between the electrodes 6 and 7 of the float cloth 2a and 2b is heated, molten and fused. At this time, a V-shaped groove 4a is formed on the joint surface with a lens cap 3 which forms the inner peripheral surface at the top part of the float 2. Then, the electrodes 6 and 7 are positioned at the prescribed positions, and a fused part is turned back so that a recessed part 8 is superposed with the float cloth 2b. Then, the groove 4a is molten by the high frequency heating, and the joint surface is shaped to a flat plane.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for manufacturing a float used to obtain buoyancy for marine sensors, etc. that are floated or moored on the sea. The present invention relates to a method of manufacturing a float for attaching an object to be bonded, such as a lens cap, to the peripheral surface.

[Conventional technology]

FIG. 2 is a perspective view showing an example of a float attached to an ocean sensor. In the figure, 1 is the ocean sensor, 2 is the float attached to the upper end of the ocean sensor 1, and 3 is the inner peripheral surface of the top of the float 2. This lens cap 3 serves as an object to be bonded, and a lamp (not shown) is arranged inside the lens cap 3, so that the position of the ocean sensor 1 can be confirmed from an aircraft or a ship at night. There is.

Further, the float 2 is expanded by gas supplied from a gas supply mechanism (not shown) provided in the ocean sensor 1, thereby obtaining buoyancy of the ocean sensor 1, and floating on the sea surface or via a mooring lobe (not shown). and moored to a ship, etc.

Conventionally, the float 2 is formed by high-frequency welding a plurality of pieces of float fabric cut into a predetermined shape to have a cylindrical top, and then a lens cap 3 is bonded to the inner peripheral surface of the top. I try to install it by

FIGS. 3A to 3C are perspective views showing the process of attaching the lens cap 3 in this case.

First, as shown in FIG. 3(a), the float 2 is made of three float fabrics 2a, 2 made of plastic rubber, etc.
Consists of float fabrics 2a and 2b, 2c, which are adjacent to each other.
By overlapping the inner surfaces of the side portions of b and 2C1 and 2C and 2a, and sandwiching the overlapping portion between electrodes (not shown) formed in advance to correspond to the outer shape of the float 2, and performing high-frequency welding. It is formed in a shape with a cylindrical top.

In the float 3 formed in this manner, substantially square-shaped grooves 4a, 4b, and 4c are formed on the inner peripheral surface of the top portion by fusing the float fabrics 2a, 2b, and 2c.

Therefore, when attaching the lens cap 3 to the top of the float 2, apply a little more adhesive to the outer peripheral surface of the lens cap 3 and the inner peripheral surface of the top of the float 2, and attach the lens camp 3 to the top of the float 2. Insert inside.

At this time, the aforementioned groove 4a is formed between the float 2 and the lens cap 3 as shown in FIG. 3(b).

4b and 4c is created, so the lens cap 3 is rotated relative to the float 2 and squeezed to fill the gap with adhesive, and then as shown in FIG. 3(C). By wrapping a vinyl tape around the outer periphery of the top of the float 2, the lens cap 3 is bonded and fixed so that it does not move, and airtightness between the top of the float 2 and the lens camp 3 is achieved.

[Problem to be solved by the invention]

As mentioned above, in the conventional technology, the gap created between the inner peripheral surface of the top of the float and the lens cap by the groove formed by fusing the float fabric during float manufacturing is filled with adhesive. However, since the gap is approximately triangular in shape, it is difficult to completely fill the corners with the adhesive, which poses the problem of low airtight reliability.

The present invention was made to solve these problems, and it eliminates the grooves formed by fusing the float fabric.
It is an object of the present invention to provide a method for manufacturing a float that can improve the reliability of airtightness by improving bondability with a lens cap.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention overlaps the inner surfaces of the side parts of a plurality of pieces of float fabric, and high-frequency welds the overlapped parts to form a cylindrical shape. In the method for manufacturing a float, the float is formed into a shape having a top portion, and an object to be welded is joined to the inner peripheral surface of the top portion. The inner circumferential surface of the top part is flattened so that the groove is removed by sandwiching the groove with electrodes from the inside and outside, and by melting the peripheral part of the groove with both Ti.

[Effect]

In the present invention having the above-mentioned configuration, since the top inner circumferential surface of the float is shaped flat, high airtightness is achieved when an object to be bonded, such as a lens cap, is bonded to the top inner circumferential surface of the float with an adhesive. can be obtained, increasing the reliability of airtightness.

〔Example〕

Examples will be described below with reference to the drawings.

FIGS. 1(a, 1 to d) are manufacturing process diagrams showing an embodiment of the method for manufacturing a float according to the present invention. In the figures, 23, 2b, and 20 are float fabrics forming the float 2 similar to the conventional one; and 7 are electrodes for shaping, and here, one electrode 6 is set as the pressure side, and the pressure side electric field Fli6 is set so that its contact area with the float fabric is smaller than that of the other electrode 7.

In this embodiment, first, as shown in FIG. 1(a), the inner surfaces of the side parts of the float fabrics 2a and 2b, which correspond to the top of the float 2, are overlapped, and the overlapped parts are used as the electrodes 6.
．． 7, and apply a pressing force as shown by the arrow from the electrode 6 side to sandwich it.

After doing this, when a high frequency current is passed through the electrode 6.7 using a high frequency generator (not shown), the float fabric 2
The portion sandwiched between the electrodes 6.7 of a and 2b is heated and melted and fused as the current is applied.

As a result of this fusion, the float 2
Approximately ■
A letter-shaped groove 4a is formed.

Also, during this fusion, the surfaces of the float fabrics 2a and 2b are melted on the electrode 6 and 7 sides, but since the electrode 7 has a large contact area with the float fabric 2a, the outer peripheral surface of the float fabric 2a on the electrode 7 side The sides are flat. However, since the electrode 6 has a small contact area with the float fabric 2b and the pressing force is applied from the electrode 6 side, four portions 8 formed by the electrode 6 are formed on the outer peripheral surface side of the float fabric 2b.

Therefore, as shown in FIG. 1(C), the other electrode 7 is placed on the joint surface with the lens cap 3, and the fused portion is folded back so that the recess 8 overlaps with the float fabric 2b. Furthermore, by placing one electrode 6 on the fused portion side and applying a pressing force, the peripheral area of the groove 4a is closed to both electrodes 6.
．． After clamping at step 7, a high frequency current is applied in the same manner as above.

As a result, as shown in FIG. 1(d), the peripheral portion of the groove 4a melts and the groove 4a disappears, and the joint surface with the lens cap 3 is shaped flat.

In the same way, float fabrics 2b and 20, Saranikono 2
By fusing and shaping c and 2a, the joint surface with the lens cap 3, that is, the inner circumferential surface of the top of the float 2 is formed flat over the entire circumference, as shown in FIG. 1(e).

Then these float fabrics 2a and 2b, 2b and 2c
, 2c and 2a are sandwiched between electrodes (not shown) formed to correspond to the outer shape of the float 2, and high-frequency welded as in the conventional manner.

When attaching the lens cap 3 to the top of the float 2 manufactured in this way, adhesive is applied to the outer peripheral surface of the lens cap 3 and the inner peripheral surface of the top, and the lens cap 3 is inserted inside the top. After that, the lens camp 3 may be fixed by further wrapping a vinyl tape 5 around the outer periphery of the top.

In the above-described embodiment, the float fabric 2a is used.

Although it has been explained that the float is formed by first welding and shaping the top part of the float 2 of 2b and 2c, and then high-frequency welding the other parts, the sides of the float fabric 2a, 2b, and 2c After the entire portion is high-frequency welded, the top portion of the float 20 may be welded and shaped.6 [Effects of the Invention] As explained above, the present invention provides high-frequency welding of the side portions of a plurality of pieces of float fabric. By overlapping the inner surfaces and performing high-frequency welding, the periphery of the groove formed on the inner peripheral surface of the cylindrical top is sandwiched between electrodes from the inside and outside of the top, and the periphery of the groove is melted by both electrodes. The inner circumferential surface of the top is shaped flat so that there are no grooves, so high airtightness is achieved when objects to be bonded, such as lens caps, are bonded to the inner circumferential surface of the top of this float with adhesive. This has the effect of increasing the reliability of airtightness.

[Brief explanation of drawings]

FIG. 1 is a manufacturing process diagram showing an example of a method for manufacturing a float according to the present invention, FIG. 2 is a perspective view showing an example of a float attached to an ocean sensor, and FIG. 3 is a conventional method for attaching a lens cap 3. Attached is a perspective view showing the process. 2: Float 2a-2c: Float fabric 3: Lens cap 4a-4c: Groove 6.7: Electrode patent applicant Oki Electric Industry Co., Ltd.

Claims (1)

[Claims] (1) The inner surfaces of the side parts of multiple pieces of float fabric are overlapped, and the overlapped parts are high-frequency welded to form a shape with a cylindrical top, and the inner peripheral surface of the top is covered. In a method for manufacturing a float in which the bonded objects are joined, the periphery of the groove formed on the inner peripheral surface of the top by the fusion is sandwiched between electrodes from the inside and outside of the top, and the periphery of the groove is sandwiched between the electrodes from the inside and outside of the top. A method for manufacturing a float, which comprises melting the top part and shaping the inner circumferential surface of the top part flat so that there are no grooves.