JP2543009Y2 - Parking brake knob - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knob used for a parking brake of a vehicle.

[0002]

2. Description of the Related Art Since a knob such as a parking brake of a vehicle is a part directly pressed by a finger when the parking brake is operated, an improvement in tactile sensation has been attempted. For this reason, conventionally, a relatively hard core material (for example, polypropylene, etc.) and a relatively soft skin (for example, polyvinyl chloride,
A two-layer knob constituted by coating with an elastomer or the like has been manufactured.

[0003] Further, since such knobs are parts that are visually recognized in appearance, they have a dividing line (hereinafter, referred to as "parting lines") formed by a split molding die in accordance with the recent sophistication of a vehicle interior. It is preferable that there is no trace of a gate used for molding, a parting line for degassing, and the like.

Accordingly, the two-layer type knob is usually manufactured by an injection molding method described below. FIG. 6 shows the conventional 2
It is sectional drawing which shows an example of the manufacturing method of a layer type knob. According to the conventional method, the hard knob core 1 is first arranged in the cavities of the split molds 2a and 2b in FIG. Then, the molten soft resin 5 is injected through the runner 3 and the gate 4 disposed above the split mold, and the knob core 1
Is formed to form a knob skin 6 made of a soft resin, thereby manufacturing a two-layer knob. In the two-layer knob N manufactured by this method, the part where the above-mentioned parting line 7 exists is inserted into the grip 8 as shown in FIG. Absent.

[0005]

Generally, when the molten resin 5 is injected to form the knob skin 6 as in the conventional method, this resin injection flow causes the knob core material 1 to flow as shown in FIG.
And an injection flow 11 flowing from the vicinity of the gate 4 to the distal end side. Therefore, at the point A where the injection flows 10 and 11 collide,
There is a problem that defects in molding such as weld lines and gas pools are easily generated, and defects are easily generated in the appearance of the obtained two-layer knob.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is an object of the present invention that the above-mentioned appearance defects are hardly generated and the selection of molding conditions is easy. It is an object to provide a layered parking brake knob.

[0007]

In order to solve the above problems SUMMARY OF THE INVENTION, knob parking brake of the present invention, in the knobs constructed parking brake covering the bag-like knob skin member to the knob core, the knob core The material is the knob skin
Protruding from the outer peripheral surface of the knob core material in the coating area of the material,
The component from the gate to inject the molding material for the knob skin member
A dam member for regulating a direction of the injection flow of the molding material;
The stop member is located at both side positions sandwiching the gate portion, and
From the base end of the cover area to the vicinity of the front end of the knob core material
The gate portion is formed in the axial direction of the knob core material,
Forming a flow path of molding material through the tip of the knob core material from
Characterized in that it.

[0008]

In the present invention, the blocking member is connected to the gate portion.
At both side positions sandwiching the knob core material and the coating area of the knob core material.
From the base end to the vicinity of the distal end in the axial direction of the knob core material.
The tip portion of the knob core is formed from the gate portion.
To form a flow path of the molding material passing therethrough.

Therefore, the injection flow of the molding material flows through substantially the same path. Conventionally, the injection flow bypassing the distal end of the knob core and the injection flow flowing from the vicinity of the gate portion to the distal end of the knob core. The molding defects caused by the collision with the flow are less likely to occur, and the appearance defects are less likely to occur.
A layered knob is obtained.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment to which the present invention is applied will be described below in detail with reference to the drawings.

[0011]First embodiment  FIG. 1 is a partially cutaway view of a two-layer knob to which the present invention is applied.
FIG. In the figure, the knob skin member 30
Is cut out. FIG. 2 is a sectional view taken along the line AA in FIG.
It is sectional drawing in a cut surface.

In FIG. 1, the knob core 20 has a stepped shape with a slightly smaller diameter on the distal end side than on the proximal end side, thereby forming the insertion portion 22. The insertion portion 22 is covered so as to be surrounded by the knob skin member 30.

An appropriate number of engagement grooves 24 are provided along the axial direction of the knob core member 20 in the knob core member insertion portion 22. As shown in FIG. The engagement of the protrusion 32 of the knob skin member 30 prevents rotation of the knob skin member 30.

The insertion portion 22 is provided with a retaining groove 26 on its outer peripheral portion in a direction perpendicular to the axial direction so as to prevent the knob skin member 30 from coming off in the left direction in FIG. I have.

On the outer periphery of the insertion portion 22, an appropriate number of blocking members 28 which are a feature of the present invention are provided in a protruding state. Specifically, the blocking member 28 is
60 are formed at two positions on both sides sandwiching
From the base end of the insertion portion 22 to the vicinity of the front end of the
The gate 60 is formed in the axial direction of the
Form a flow path of the molding material passing through the tip of the knob core 20.
It has become so. In this embodiment, the knob core member 20 and the dam member 28 are formed integrally, but they may be formed separately and assembled. This blocking member 28
Does not reach half the circumference of the insertion portion 22, but has an appropriate width (see FIG. 2). Further, as shown in FIG. 2, the cross-sectional shape of the top surface 28a of the dam member 28, an arc centered on the center O of the knob core 20, the knob skin member 30
In close contact with the inner surface of the

The damping member 28 regulates a molding material injection flow for forming the knob skin member 30.
This state will be described with reference to FIG.

In FIG. 1, the knob core 20 is divided into four molds 4 which can be moved in the left-right direction by driving means (not shown).
0a, 40b. Then, the molten molding material 70 is injected into the cavity through the runner 50 and the gate 60 provided above the split molds 40a and 40b. When the molding material 70 enters the cavity, it is largely divided into an injection flow 70a along the retaining groove 26 and an injection flow 70b to the tip end side of the knob core member 20 by the action of the retaining groove 26. The flow of the injection flow 70a is obstructed by the blocking member 28, and as shown in FIG.
It flows around b. Therefore, the injection flow 7
0b, and the injection flow 70a
And 70b do not collide with each other, and molding defects such as gas pools and weld lines are prevented.

Next, the operation of this embodiment will be described.

In this embodiment, since a plurality of dam members 28 are provided on the outer peripheral portion of the insertion portion 22 of the knob core member 20, the molten molding material 7 for forming the knob skin member 30 is provided.
The direction of the injection flow in the cavity 0 is regulated, so that the injection flows 70a and 70b flow in substantially the same path. Accordingly, the injection flows 70a and 70b do not collide with each other, and molding defects such as gas pools and weld lines can be reliably prevented.

[0020]Second embodiment  Another embodiment of the present invention is shown in FIGS.
The substantially same members as those in the first embodiment have the same reference numerals.
It is attached.

FIG. 4 is a side view showing another embodiment of the present invention, in which the knob skin member 30 is cut away. In the figure, a flow path 29 is provided on the tip side of the blocking member 28. The flow path 29 functions as a flow path of the molding material injection flow during the injection of the molding material, and also functions to prevent the knob skin member 30 from coming off in the leftward direction in FIG. 4 after the molding material has hardened. That is, when this flow path 29 is combined with the retaining groove 26 provided on the outer peripheral portion of the insertion portion 22 of the knob core 20, the retaining groove is formed over the entire circumference of the insertion portion 22. Become. Therefore,
It is possible to more reliably prevent the knob skin member 30 from coming off in the left direction in FIG.

The position and width of the flow path 29 can be determined by appropriately changing the characteristics of the resin used for molding, the length of the insertion portion 22 and the length of the dam member 28, and the like. The position of the flow path 29 is preferably located on the tip side in order to prevent collision of the injection flow of the molding material and to prevent molding defects.

FIG. 5 shows a state when the molten molding material 70 is injected. In this figure, this molding material 70 is supplied to a split molding die 40a, 4
0b is injected into the cavity. The injected molding material 70 is supplied to the blocking member 28, the flow path 29 and the retaining groove 2.
By the action of 6, the injection flow is largely divided into injection flows 70a, 70b and 70c. Since the paths of the injection flows 70a, 70b, and 70c are substantially in the same direction, molding defects such as gas pools and weld lines caused by the collision of the resin flows are less likely to occur.

Next, the operation of this embodiment will be described.
In this embodiment, the blocking member 28 and the blocking member 2
Since the flow path 29 is provided on the front end side of 8, the molding material injection flows can be regulated so as not to collide with each other. In addition, the flow path 29 can be reliably prevented from coming off the knob skin member 30 in combination with the retaining groove 26.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various modifications can be made within the scope of the present invention. For example, the knob core 20 is made of not only polypropylene but also ABS.
Relatively hard resins such as resin, polyacetal, Hytrel [trade name] (a thermoplastic polyester elastomer manufactured by Toray DuPont Co., Ltd.), and hard vinyl chloride can be used. The knob skin member 30 can be made of not only polyvinyl chloride but also a relatively soft resin such as an elastomer.

Further, the knob core material 20, the knob skin member 30
Can take various forms.

[0027]

[Effects of the Invention] As described above, according to the present invention,
By providing a dam member on the outer periphery of the knob core material, the molding material injection flow can be easily regulated, thereby making it easy to set molding conditions, and reducing molding defects such as gas pools and weld lines. This has the effect of providing a two-layer type parking brake knob with extremely low occurrence.

[Brief description of the drawings]

FIG. 1 is a side view of a knob according to a first embodiment to which the present invention is applied, partially cut away.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is a side view showing a state when a molding material is injected.

FIG. 4 is a side view of a knob according to a second embodiment of the present invention, which is partially cut away.

FIG. 5 is a side view showing a state when a molding material is injected.

FIG. 6 is a side view showing a manufacturing process of a conventional two-layer type knob.

FIG. 7 is a partial sectional view of a conventional parking brake.

FIG. 8 is a side view showing a state when a molding material is injected in a conventional method.

[Explanation of symbols]

Reference Signs List 20 knob core material 28 dam member 30 knob skin member 70a, 70b, 70c molding material injection flow
HB008002

Continuing on the front page (72) Inventor Kiyoshi Sawada 10 Michigami, Wakaai-cho, Toyota-shi, Aichi Pref. Toyo Brake Industrial Co., Ltd.

Claims (1)

(57) [Scope of request for utility model registration] 1. A parking brake knob comprising a knob core material covered with a bag-shaped knob skin material, wherein the knob core material is provided in the area covered by the knob skin member.
Forming the knob skin member protruding from the outer peripheral surface of the knob core material
The direction of the molding material injection flow from the material injection gate
A restricting dam member, wherein the dam member is located at both side positions sandwiching the gate portion, and
The vicinity of the tip end from the base end of the coating area of the knob core material
Up to the knob core material in the axial direction,
Flow path of the molding material from the seat portion to the tip of the knob core material
A parking brake knob, characterized by forming: