JPS6234844Y2 - - Google Patents

Description

[Detailed description of the invention] The core body for sealing members of this invention relates to improvements in the core body for weather strips, trims of automobile doors, engine bonnets, etc., and other sealing members. A plurality of longitudinal holes and grooves are formed in the strip plate at equal intervals in the longitudinal direction and arranged in rows in the lateral direction, and are configured to be cut very easily in the braking process, and the covered rubber-like material is The aim is to construct a core for a sealing member that prevents damage to the seal member and provides high bending performance by having both sides of each row separated, while also having high stability performance against appropriate tensile resistance.

This core is usually made of a thin metal band-shaped flat plate of about 0.5 mm, with two or more longitudinal holes in each row arranged at equal intervals in the longitudinal direction and grooves on both sides. After covering and embedding a rubber-like material, which is an elastic polymer material such as plastic, using an extruder and hardening and molding, the short distance between the grooves on both sides of each row and the long holes is cut in the breaking process. The seal member is curved in a direction perpendicular to the longitudinal direction so as to fit into the attachment portion of the seal member.

The basic structure of a conventional elongated belt-shaped core body made of a thin plate is shown in FIGS. 1 and 2.

That is, the core body 1 in FIG. 1 has longitudinal holes 2 arranged in parallel with their ends aligned in a direction perpendicular to the longitudinal direction, leaving side widths SW of the same length in the longitudinal direction on both sides. A notch 4 is formed on the side edge at a relative position of the two, and an engraved part 3 is formed between the notch 4 and the elongated hole 2 so as not to penetrate to the back surface.

In this case, in the braking process,
The strips 5 between each other are separated into pieces in the covering rubber. The seal member is curved in a direction perpendicular to the longitudinal direction so that it can be fitted into the attachment portion of the seal member.

In Fig. 2, the longitudinal holes 2 are provided in a zigzag shape, and wide portions 6 and gap portions 7 are alternately formed between the notch 4 of the side edge 8 and the longitudinal holes 2, and the gaps are formed in the braking process. This is for cutting the section 7.

In this case, the cuts are formed alternately, so
The strip portions 5 do not fall apart and are continuous in a zigzag pattern within the covering rubber.

The former case shown in FIG. 1 has the following drawbacks.

B. During the manufacturing of the seal member, a considerable tensile force is applied to the core, which may cause it to break and come apart during the extrusion and vulcanization processes.

○B Even if the core does not fall apart, it will break apart if the core embedded in the rubber is cut to a certain length and then subjected to the braking process.
If it becomes longer than a certain length, it becomes dimensionally unstable.

○C If a tensile force is applied to the sealing member while the core body is in pieces and the sealing member is cut to a required fixed length, the resulting shrinkage will result in a dimensionally unstable product.

○D When the completed seal member is installed in a predetermined location, the tensile force in the length direction will be uneven, resulting in uneven sealing effect of the sealing part, and if the installation location has a large curvature, the sealing part will be uneven. falls down.

○E This center body forms a through-embossed part and a non-through-embossed part, and is stretched both vertically and horizontally by pressing and stretching, and the through-embossed part is opened to form a longitudinal hole 2, and the side width is Since the SW portion is formed to have a particularly thin thickness, cutting defects at the stamped portion often occur during this pressing and stretching process.

In consideration of the above-mentioned drawbacks, it is necessary to eliminate the non-penetrating embossed portion in order to prevent it from falling apart, and the structure thereof is shown in an example in FIG.

The exemplary core shown in FIG. 2 has wide portions 6 and narrow portions 7 alternately formed between the side edge portion 8 and the longitudinal hole 2;
It has a structure in which the cut portion is obtained by forming the gap 7 near the side edge 8, and stress concentration is not obtained in the cut portion during the braking process, so the cut portion is not easily cut and requires a considerable number of braking cycles. Moreover, the number of times of cutting is also variable and varies widely, and there is a drawback that the adhesion between the covering rubber and the core body is reduced by the time it is completely cut, and the rubber is seriously damaged. It also has the disadvantage that it does not provide good performance.

Therefore, the inventors believe that high bendability can be easily obtained by cutting easily and with less variation in the number of braking cycles, resulting in less damage to the covering rubber-like material and less decrease in adhesive clamping force. On the other hand, as a result of our search for a structure for a core that is highly stable against tensile forces, we have developed the core for a sealing member of this invention.

This seal member core is provided with grooves having curved tips of the same height in the width direction on both sides of the core body made of a thin metal band plate, arranged in parallel at equal intervals in the longitudinal direction, and facing each other. Two or more large and small longitudinal holes are drilled between the grooves in each row, and the large and small longitudinal holes are arranged in the same manner alternately in opposite directions in each row, and the grooves on both sides of each row and the longitudinal holes are arranged in the same manner. A short spaced part that can be cut in the braking process is provided at the same position in the longitudinal direction between the mutually curved tip parts, and a wide spaced part that becomes a connecting part is placed at one location outside the center of the width of the core body. Each row is formed so as to be set at symmetrical positions in opposite directions alternately, and the short-spaced parts are made to have as small a cross-sectional area as possible so that they can be cut very easily during the braking process, and longitudinal sections are formed on both sides. Provided on the same line in the direction to facilitate bending and to concentrate stress locally, and near the short distance part, the upper and lower covering rubber-like substances are connected to be strongly sandwiched and held elastically. However, even if both sides come apart during the braking process, they are elastically supported by a rubber-like substance,
The wide-spaced portion, which is the connection portion of the core, is formed outward from the center of the width of the core to apply appropriate tensile stress and to prevent twisting or deformation. Note that the shapes of the grooves and the curved tips of the elongated holes are not limited to those illustrated in the embodiments.
Various deformation curves are considered as appropriate.

Embodiments of the invention will now be explained in more detail with reference to exemplary drawings showing embodiments.

Figures 3, 4, and 5 show that two large and small longitudinal holes are provided between grooves having curved tips of the same height provided on both sides of the sealing member core CS of this invention. FIG. 6 shows an example in which three longitudinal holes are provided.

In Fig. 3, 9 is a groove, 10 is a large longitudinal hole,
11 is a small longitudinal hole, 12 is a short spaced part, and 13 is a wide spaced part.The short spaced part 12, which is repeatedly bent and cut during the braking process, is placed on both sides of each row in the same direction on a straight line in the longitudinal direction. Widely spaced portion 13 that forms a connection that is set in position and is not cut during the braking process.
are arranged at one location in each row, closer to the outside than the center of the width of the core, and alternately arranged in symmetrical positions in opposite directions in each row. Note that the short-spaced portion and the wide-spaced portion are indicated by dotted lines on the drawings.

In FIG. 4, a large longitudinal hole 10a is made slightly shorter than the large longitudinal hole 10 in FIG. 3, and a small longitudinal hole 11a is made slightly longer than the small longitudinal hole 11. The position is a little closer to the inside than the one shown in FIG.

FIG. 5 shows a wide-spaced part 1 that is further inward than in FIG. 4 due to the large longitudinal hole 10b and the small longitudinal hole 11b.
This is an example in which the number of connecting parts is set as 3.

Fig. 6 shows an example in which a total of three holes, one large longitudinal hole 10c and two small longitudinal holes 11c, are provided in one row in the horizontal direction. One location on the side and two locations on the other side are alternately set in opposite directions in each column.

In the above configuration, the length relationship between the large elongated hole and the small elongated hole is such that when the large elongated hole is made longer and the smaller elongated hole is made shorter, the position of the connecting portion 13 is formed closer to the outside, The elongation of the core body CS tends to increase, and if it is reversed, the elongation tends to decrease.If the large longitudinal hole and the small longitudinal hole are made the same length, the connecting part 13 will be formed in the center and will not elongate. It begins to show a trend.

Therefore, in this invention, the connecting portion 13 is set at only one location on the outside of the center, and the short-spaced portions 1 with small cutting cross-sectional areas that can be easily cut on both sides in each row are used.
2, which are separated and strongly elastically clamped by a rubber-like substance to form a sealing member, thus providing high bending performance. In addition, the connecting part,
It is located outside the center of the width of the core, and has an appropriate tensile resistance that will not cause twisting or deformation during the manufacturing process of the seal member and will provide high stability even if both sides are separated. It is designed to bring out its characteristics. Further, by changing the position of this wide connecting portion, the flexibility in the product state can be adjusted.

Further, the short distance portion that can be cut is formed between the mutually curved tips of the longitudinal hole and the groove, and the vicinity of the short distance portion is strongly sandwiched and bonded by the connection of the upper and lower covering rubber-like substances. Since stress is concentrated at the tip when bending, and since both the lateral and longitudinal directions are on the same line, bending is easy.Also, since it is repeatedly bent under the same conditions during bending, the number of braking times can be reduced. There is no variation in the number of cuts, and the cutting is easy and concentrated in a small number of times. Therefore, it has the characteristics of a core that can prevent damage to the covering rubber-like substance and decrease in clamping covering force, and form a highly durable sealing member that provides high stable flexibility and bendability. It is something.

As shown in the perspective view of FIG. 7, which shows an example of a sealing member, the core body of this invention is coated with a rubber-like substance, molded and cured, and then subjected to a braking process.
As shown in the perspective view of FIG. 8, the sealing member is formed by bending.

In the figure, CS is a core for the sealing member, 14 is a rubber-like substance, 15 and 16 are the projections, 17 is a sealing part, 9 is a groove of the core embedded in the sealing member, and 10 is a large longitudinal hole. , 11 is a small longitudinal hole, and 5 is a strip portion.

[Brief explanation of drawings]

Figures 1 and 2 are partial plan views of conventional core bodies;
3 to 6 are partially enlarged plan views of the sealing member body of this invention, FIG. 7 is a partially enlarged perspective view of the sealing member during molding, and FIG. FIG. 2 is a partially cutaway perspective view of a U-shaped core-containing sealing member. CS...Seal member core, 9...Groove, 1
0, 10a, 10b, 10c...Large longitudinal hole, 1
1, 11a, 11b, 11c...Small longitudinal hole, 12
...Short distance part, 13...Wide distance part.

Claims (1)

[Scope of utility model registration request] In the core body embedded in a rubber-like substance, grooves having curved tips of the same height in the width direction are provided in parallel on both sides of a thin metal strip plate at equal intervals in the longitudinal direction. Two or more large and small longitudinal holes are drilled in each row between the grooves that face each other, and the large and small longitudinal holes are arranged in the same manner in opposite directions alternately in each row, and the grooves and longitudinal holes on both sides of each row are arranged in the same way in opposite directions. A short spaced part is provided at the same position in the longitudinal direction between the mutually curved tip parts, and a wide spaced part that becomes a connecting part is set at one place outside the center of the width in each row alternately at symmetrical positions in the opposite direction. A sealing member body characterized by: