JP3124829U - Tubular bellows - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate a place where a dent is generated in an outer edge portion during extension so that the size, shape and the like can be made uniform.
SOLUTION: The outer edge and the outer edge of the layered rubber sheet 11 and the immediately preceding one are fused, and then the inner edge and the inner edge of the stacked and immediately preceding sheet are fused. In the tubular bellows 10 having a configuration in which the outer edges of the annular rubber-like sheet are fused, a cutout portion 13 is provided on each outer edge of the set, and the cutout edge 14 of the cutout portion is formed following the fusion portion 15 of the outer edge. Are fused. The cutouts are provided in the same shape and dimension at equal intervals in the circumferential direction for each set of annular rubber-like sheets, and are arranged in a direction along the axis of the tubular bellows. Moreover, the notch edge of the notch part is formed in the circular arc shape which convex the bellows axis line side to the bellows axis line side.
[Selection] Figure 1

Description

  The present invention relates to a tubular bellows formed of a rubber-based material.

  As shown in FIG. 2, the conventional tubular bellows 1 of this type is formed by coaxially laminating a large number of annular rubber sheets 2 and fusing the outer edge portion 3 for each set as a set of two sheets. Further, the adjacent rubber sheet 2 is formed by fusing the inner edge portions 4 of the adjacent rubber sheets 2, that is, the rubber sheet 2 has the first and second outer edge portions 3 fused in order from the end. The third and the fourth are fused to the inner edge 4, the third and the fourth are fused to the outer edge 3, and the outer edge 3 and the outer edge 3, and the inner edge 4 and the inner edge 4 are alternately fused. It is formed in a tubular shape with a large number of ridges 5 in the axial direction. Since the bellows 1 is made of rubber, it can elastically extend and contract in the axial direction. For example, the bellows 1 is used as a dustproof cover in a portion where a piston rod of a double-acting fluid pressure cylinder protrudes from the cylinder. Note that flanges 6 are generally provided at both ends of the tubular bellows 1.

The problem to be solved is that, as shown in FIG. 2 (a), the ridge 5 is neat, regular and clean when slightly extended in the axial direction. However, as shown in FIG. In the state of being extended in the axial direction, dents 7 that are generally radially inward are formed at 1 to 3 locations on the outer peripheral portion of each flange 5 and become irregular. These dents 7 are similar in shape but are uneven in location, size and direction. Depending on the application, the shape is not well balanced with other parts, and this may damage the image of a product. There is.
When the conventional tubular bellows 1 is stretched, the inner diameter does not contract, and the outer diameter tends to contract, and an irregular recess 7 is formed. In other words, when the outer diameter is about to shrink, the outer edge is subjected to a compressive action in the circumferential direction, so that the outer edge is deformed so as to protrude laterally (left or right) with respect to the bonding surface of the outer edge (surface perpendicular to the bellows axis). The diameter contracts to form a dent 7.
An object of the present invention is to regulate the place where the dent 7 is generated and to prevent the image of a product using the tube bellows from being impaired as a tubular bellows capable of making the size and shape of the dent uniform.

  The means of the present invention is to fuse the outer edges and outer edges of the ones that are overlapped and overlapped with the annular rubber-like sheets in sequence, and then fuse the inner edges and inner edges of the ones that are stacked and the previous ones. In the tubular bellows, which is a repeated structure, a cutout portion is provided in each set of outer edges of the annular rubber-like sheet fused to each other, and the cutout edge of the cutout portion follows the fused portion of the outer edge. Are fused. According to this means, the outer diameter tends to shrink when stretched, but the outer edge approaches the notch due to the presence of the notch, so that the width of the notch is reduced. Accordingly, the dents are concentrated on the notch, and the dents are hardly generated in the other parts. In other words, by reducing the width of the notch, irregular deformation of the outer edge can be avoided, and deformation (dent) corresponding to the shape of the notch occurs only around the notch, and the place where the recess occurs can be regulated. .

  It is preferable that the cutout portions have the same shape and dimension at equal intervals in the circumferential direction for each set of the annular rubber-like sheets. In this configuration, since the cutout portions have the same shape and dimension at equal intervals in the circumferential direction in each set of the tubular rubber-like sheets, the shape of the dents is uniform and arranged.

  The cutouts are preferably arranged regularly throughout the bellows. The cutouts may be arranged in a direction along the axis of the tubular bellows. According to such a configuration, the design is excellent.

  It is preferable that the notch edge of the notch is formed in an arc shape that protrudes from the bellows axis to the bellows axis. In this configuration, when the bellows is extended, the notch edge of the notch portion fused in each group receives an acting force that separates the fused portions, but since the arc is formed in an arc shape, stress is applied. Distributed and difficult to damage.

  The present invention has an effect of being able to regulate the position where the dent is generated and to eliminate the irregular dent by the configuration provided with the notch. Moreover, the notch part can be made into the well-shaped dent shape by making the same plurality with the same shape at equal intervals in the circumferential direction for every group of annular rubber-like sheets. Further, the position of the dent can be selected and determined to be excellent in design. Therefore, since the product using this tubular bellows cannot be irregularly depressed when the bellows is stretched as in the prior art, the product image is hardly damaged. In addition, the notch edge of the notch is formed in an arc shape that protrudes from the bellows axis to the bellows axis, so that stress that tends to concentrate on the adhesive part of the notch edge when the bellows is extended is distributed. It has the effect of preventing damage.

  It is a structure in which the outer and outer edges of the annular rubber sheet are stacked one after the other and the previous one are fused, and then the inner and inner edges of the first and the second one are repeated. In a certain tubular bellows, a cutout portion is provided in each outer edge of the set in which the outer edges of the annular rubber-like sheet are fused together, and the cutout edge of the cutout portion is fused after the fused portion of the outer edge. The cutouts are provided in the same shape and dimension at equal intervals in the circumferential direction for each set of annular rubber-like sheets, and are arranged in a direction along the axis of the tubular bellows. Moreover, the notch edge of the notch part is formed in the circular arc shape which convex the bellows axis line side to the bellows axis line side.

  An embodiment of the present invention will be described with reference to FIG. The tubular bellows 10 has a structure in which a large number of annular rubber sheets are sequentially bonded in the same manner as the conventional one, but the annular rubber sheet 11 is provided with a notch 13 at the outer edge 12. The point is different from the conventional one. That is, as shown in the side view of FIG. 1 (b), the notch 13 is convex toward the center of the rubber sheet 11, that is, the axial side of the bellows, at four locations on the outer edge 12 at equal intervals in the circumferential direction. It is formed in the shape of an arc with the same shape. The rubber sheet 11 is welded to the outer edge 12 two by two at the same time, and the notch edge 14 is adhesively bonded at a fusion part 16 following the fusion part 15 of the outer edge 12. The fusion is, for example, by high frequency fusion. In the figure, reference numeral 17 denotes a fused portion of the inner edge 18 of the rubber sheet. In the fused state, as shown in FIG. 1 (a), two adjacent rubber sheets 11 are joined to each other by joining the outer edge 12 and the notch edge 14 with fused portions 15 and 16, respectively. A plurality of sets are stacked in such a manner that the positions of the notches 13 are arranged in a row parallel to the axis of the bellows, and the adjacent rubber sheets 11 and 11 between the adjacent sets are fused by the fused portion 17 of the inner edge 18 to form a bellows. I am doing. A normal flange (not shown) is provided at both ends of the bellows 10. The material of the annular rubber sheet 11 is a so-called rubber-like substance selected from, for example, synthetic rubber such as urethane, neoprene, butyl, nitrile, etc., other than natural rubber and soft resin, depending on the use of the tubular bellows. Depending on the case, a composite of fiber materials is also used.

  When the tubular bellows 10 configured in this way is stretched in the direction of the axis, as shown in FIG. 1C, a recess 19 is formed around the notch 13, but the outer edge 12 is a surface perpendicular to the axis. There is no deformation that protrudes, and the notch edge 14 is also substantially parallel to a plane perpendicular to the axis. Further, the recess 19 is also formed in a substantially symmetrical shape on both sides with respect to a plane perpendicular to the axis line coincident with the outer edge 12. That is, when the outer diameter of the bellows 10 is contracted by being stretched, the outer edge 12 divided into four by the four notches 13 approaches the notch 13, and the notches 13 When the width is reduced and the notch 13 is not present, irregular deformation, i.e., distortion of the peripheral edge is easily absorbed by the presence of the notch 13, and the recess 19 is formed around the notch 13 due to slight displacement of the notch 13 toward the axial line. It can be done.

  Accordingly, each of the recesses 19 is uniform in shape and size, and has a linear arrangement along the axis as viewed from the whole bellows. For example, the tubular bellows 10 is used as a dust-proof cover for a cylinder rod so that there is no sense of incongruity. , The image of a product using a cylinder device or a cylinder is improved as compared with the conventional product. In addition, the notch edge 14 of the notch 13 is formed in an arc shape convex from the bellows axis to the bellows axis, which is concentrated on the convex end of the fusion part 16 of the notch 14 when the bellows 10 is extended. Disperse stress that is easy to damage to prevent damage.

1 shows an embodiment of the present invention, (a) is a cross-sectional view taken along line AA of (b), (b) is a side view in a shortened state, (c) is a partial front view in an extended state, and (d) is in an extended state. FIG. The conventional tubular bellows is shown, (a) Partial cross-section partial front view, (b) is a side view, (c) is a partial front view in an extended state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tubular bellows 11 Annular rubber sheet 12 Outer edge 13 Notch part 14 Notch edge 15 Fusion part (outer edge)
16 Fusion part (notch edge)
17 Fusion part (inner edge)
18 Inner edge 19 Recess

Claims (5)

  It is a structure in which the outer and outer edges of the annular rubber sheet are stacked one after the other and the previous one are fused, and then the inner and inner edges of the first and the second one are repeated. In a certain tubular bellows, a cutout portion is provided at the outer edge of each set in which the outer edges of the annular rubber-like sheet are fused together, and the cutout edge of the cutout portion is fused after the fusion portion of the outer edge. Tubular bellows.   2. The tubular bellows according to claim 1, wherein a plurality of the cutout portions having the same shape and dimension are provided at equal intervals in the circumferential direction for each set of the annular rubber-like sheets.   The tubular bellows according to claim 1 or 2, wherein the notches are regularly arranged throughout the bellows.   The tubular bellows according to claim 1, 2, or 3, wherein the notches are arranged in a direction along the axis of the tubular bellows.   5. The tubular bellows according to claim 1, wherein the notch edge of the notch is formed in an arc shape that protrudes from the bellows axis to the bellows axis. .

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