JPH0636983Y2 - Grass run - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a synthetic resin glass run arranged on a door window frame of an automobile, and particularly, to an extruded long molded product having a predetermined length. The present invention relates to a glass run of a type that is used after being cut and has a reduced shrinkage rate.

(Prior Art) Conventionally, a glass run made of a soft synthetic resin is arranged as a sliding member for a door glass to be opened and closed in a window frame of an automobile door. The glass run is fitted into a channel type mounting frame. The door glass is slidable between the two support pieces, substantially corresponding to the channel portion and the support piece opposite to the opening of the channel portion.

The glass run is a type in which a long molded product extruded from a soft synthetic resin is cut into a predetermined length and attached to a door window frame.

When this attached glass run contracts in the longitudinal direction due to external temperature change, a gap is created at the end, and if this is remarkable, it will move in the window frame and cause abnormal noise,
Functionally, the glass slide resistance may fluctuate, so each automaker should assume a temperature difference between extremely cold and scorching summer, and the shrinkage rate at a certain temperature should be within a certain range. Are demanding.

Therefore, conventionally, a long glass run molded article is annealed at a high temperature to stabilize the shrinkage rate.

(Problems to be solved by the invention) In the conventional means for annealing a molded long glass run member, it is necessary to repeat annealing until the shrinkage ratio of the molded product becomes stable within an allowable range. For this reason, there are drawbacks that the number of manufacturing processes increases, time is required, and the cost increases, and sufficient results cannot be obtained.

Conventionally, there are some soft synthetic resin strings, belts, etc. in which glass fibers are arranged as a core material, but the purpose of this glass fiber core material arrangement is soft synthetic resin molded products such as strings, belts, etc. Was to increase the tensile strength of the.

The present inventor has conducted various experiments by incorporating various fiber core materials inside the glass run, especially in the channel part, and found that when the glass run is extruded, a plurality of glass fibers are formed in the mold in which the channel part is to be molded. It has been found that when a plurality of glass fiber core materials are arranged in parallel in the longitudinal direction in the channel portion by feeding yarns in parallel with each other, heat shrinkage does not occur at all or becomes extremely small.

Therefore, an object of the present invention is to provide a grass run which can solve the above-mentioned conventional drawbacks, can be manufactured easily, can significantly reduce the contraction in the longitudinal direction due to temperature change, and can reduce the cost. To do.

(Means for Solving Problems) The glass run according to the present invention is formed by extruding a soft synthetic resin, and has a channel portion fitted in a mounting frame and a support provided opposite to the opening portion of the channel portion. It is composed of a piece and a plurality of glass fiber core yarns embedded inside the channel portion, and during extrusion molding, the plurality of glass fiber yarns are sequentially fed into the mold in which the channel portion is to be formed. As a result, a plurality of glass fiber core materials are installed in parallel in the glass run member in parallel with each other along the length direction of the channel portion.

(Function) The glass run is composed of the channel portion and the supporting piece as described above. When the glass run is extruded and molded, a plurality of glass fiber threads are formed in the mold portion where the channel portion is to be molded. The glass fiber yarns are inserted at a predetermined interval and fed in synchronization with the molding speed. As a result, a plurality of glass fiber core yarns are installed inside the channel portion of the glass run parallel to each other along the length direction of the channel portion.

The number of glass fiber yarns, the distance between yarns, and the like should be appropriately set depending on the glass run to be molded, and the cross-sectional shape of the channel portion differs depending on the automobile manufacturer. In this way, a sample was prepared in which glass fiber core yarns were installed in parallel in the channel portion of the glass run, and the heat shrinkage in the longitudinal direction was measured by cutting into a predetermined length. As described above, the heat shrinkage was not observed at all even under the high temperature conditions required by the automobile manufacturer, and the excellent heat shrinkage prevention effect was obtained.

This effect is considered to be due to the fact that the thermally stable glass fiber is a thread and the binding property with the synthetic resin is enhanced, so that the cross-sectional shape of the channel part is more complicated than the sample. It is expected that the heat shrinkage will be extremely small even in the grass run.

In the grass run configured as described above, repeated work of annealing due to high temperature is not required, and the cost can be remarkably reduced, and the structure is simple and can be cut to a predetermined length. It's easy.

(Embodiment) An embodiment of the grass run according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a sectional view showing a state before the grass run is attached, and FIG. 2 is a sectional view showing the attached state.

In the figure, reference numeral 1 indicates the entire glass run extruded and molded by a soft synthetic resin, and the left and right wall portions 2a and the bottom portion 2b are shown.
Is composed of a channel portion 2 having a substantially U-shaped cross section, and supporting pieces 3 and 3 provided to face the opening of the channel portion 2. The glass run 1 is attached by fitting the channel portion 2 into an attachment frame 11 provided on the door window frame, and the door glass 10 slides between the opposing support pieces 3, 3.

The glass run 1 is extruded and molded from a soft synthetic resin, but in the molded state, that is, before mounting, as shown in FIG. 1, the bottom portion 2b is curved and the channel portion 2 is slightly expanded. As shown in FIG. 2, when the channel portion 2 is fitted into the mounting portion 11, the spring back of the channel portion 2 securely engages and holds the mounting portion 11 in the mounting portion 11.

Although there are various cross-sectional shapes of the channel portion 2, in the illustrated example, the engagement protrusion 4 is provided on the outer surface of the channel portion 2, and the contact surface with the door glass 10, that is, the bottom portion.
The surface of 2b and the surface of the support piece 3 are coated with urethane to form a urethane layer 5 on each surface. The surface of the support piece 3 may be flocked.

In the extrusion molding of the glass run 1 as described above, a plurality of twisted or untwisted yarns of glass fiber are inserted into the mold part where the channel part 2 is to be molded, and these are continuously fed in synchronization with the extrusion speed.

In the channel portion 2 of the glass run 1 extruded in this way, a plurality of core fibers 6 made of glass fibers are arranged in parallel along the longitudinal direction in a well-balanced manner. In addition,
The number of glass fiber threads to be inserted and the distance between them should be determined according to the glass run to be molded. In the embodiment, three pieces are installed in each of the left and right side wall portions 2a and three pieces in the bottom portion 2b. ing. Further, the method of inserting the yarns is also arbitrary, and it is possible to apply an adhesive to each yarn and insert it, or to insert a plurality of parallel yarns into a tape shape by prepreg processing with a resin.

Next, the glass run 1 shown in FIG. 1 and a conventional one having the same size and cross-sectional shape as that of FIG. It was on the street.

The glass run 1 has a width of 18 mm and a height of 14 mm. The annealing conditions were a temperature of 100 ° C. and a time of 2 hours, and the change in length before and after the heating was measured. The cooling was carried out naturally, and after a lapse of time, it was taken out of the furnace and allowed to stand at room temperature.
In the table, No. in the left column is a sample number, and three types of samples having different lengths were prepared. L1 is the length before heating, L2
Is the length after heating, the shrinkage amount R is L1-L2, Is.

As is apparent from the above comparative measurement results, it is recognized that the grass run according to the present invention has no heat shrinkage and is extremely stable. Therefore, it can be easily assumed that the heat shrinkage is small even in the case where the cross-sectional shape is more complicated than that of the grass run.

(Effect of the Invention) According to the glass run according to the present invention, since a plurality of glass fiber core yarns are provided inside the channel portion in parallel with each other along the length direction of the channel portion, the comparison test data shows that As is also apparent, heat shrinkage can be eliminated or minimized. Therefore, it is not necessary to repeat annealing at a high temperature, the cost can be remarkably reduced, and since the core yarn is glass fiber, it does not cause any trouble when cut to a predetermined length. Has the effect of.

[Brief description of drawings]

The drawings show an embodiment of the grass run according to the present invention. FIG. 1 is a sectional view showing a state before mounting the grass run, and FIG. 2 is a sectional view showing a mounting state. 1: Glass run 2: Channel part, 3: Support piece, 4: Engagement protrusion 5: Urethane layer, 6: Core fiber made of glass fiber 10: Door glass, 11: Mounting frame

Claims (1)

[Scope of utility model registration request] 1. A glass run made of a synthetic resin, which is disposed in a door window frame of an automobile, wherein the glass run is formed by extruding a soft synthetic resin, and a channel portion fitted in a mounting frame, It is composed of a support piece opposite to the opening of the channel part, and a plurality of glass fiber core yarns embedded inside the channel part, the glass fiber core yarns being parallel to each other. Grass run characterized by being arranged along the length direction.