JPS6129517A - Manufacture of regulator handle for vehicle - Google Patents

Abstract

PURPOSE:To prevent the defective molding of a cylindrical shaft section for a handle proper by forming a notch section to said shaft section in a method in which a rotary knob is injection-molded for the second time while using the handle proper shaped through first injection operation as an insert member. CONSTITUTION:A molten resin is injected into a first cavity 66 formed by a botbom force 62, a first top force 26 and a core section 70 with a projecting section 72 for shaping a notch section to a cylindrical shaft section for a handle proper, thus forming the handle proper. A split mold 36 and a second top force 34 are arranged newly, and a second molten resin is injected toward the outer circumferential surface of the projecting section 72 as the molding surface of a second cavity 40 from a gate 52, thus molding a rotary knob. Since the notch section is shaped, the previously injected first resin is not melted and deformed by injecting the second resin, thus obtaining a regulator handle with excellent shaft section and rotary knob.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for manufacturing a regulator handle for a vehicle.
In particular, the present invention relates to an improvement in a method for manufacturing a regulator handle for a vehicle by using the handle body formed in a first injection molding operation as an insert member and performing a second injection molding operation to form a rotation knob. .

BACKGROUND ART A regulator handle for operating a window regulator or the like of an automobile includes a handle body that integrally has a cylindrical shaft at its tip, and a handle that is provided so as to cover the outer circumference of the shaft, and that is Those equipped with a bottomed cylindrical rotary knob that freely rotatably engages with the rotary knob have been widely used in the past. FIG. 5 shows an exploded view of an example of such a regulator handle.
2 is integrally provided upright, and a rotary knob 16 having a bottomed cylindrical shape is attached to a claw portion 14 provided at the tip of the shaft portion 12.
The rotary knob 16 covers the outside of the shaft portion 12 and is freely rotatable with respect to the shaft portion 12 by being engaged with the engagement step portion 18 formed on the inner circumferential surface of the rotary knob 16 .

By the way, such a regulator handle is conventionally
By forming the handle body 10 and the rotary knob 16 separately, providing an axial slit 20 in the shaft portion 12, and pressing the rotary knob 16 while bending the shaft portion 12, the handle body 10 and the rotary knob are separated. It was manufactured by assembling 16. Therefore, due to dimensional differences between the handle body 10 and the rotary knob 16, which are formed separately, the rotary knob 16 may rattle or malfunction, or the shaft portion 12 may bend when the regulator handle is operated. , there was a problem that the operability was impaired.

In contrast, a first injection molding operation is first performed to form the handle body, and then a second injection molding operation is performed with the handle body inserted into the mold to form the outer periphery of the shaft of the handle body. In recent years, a manufacturing method has been proposed in which a regulator handle is manufactured by forming a rotary knob that freely rotatably engages with the shaft portion so as to cover the shaft portion. It is disclosed in the publication No.

FIG. 6 is a process diagram illustrating an example of such a manufacturing method. In the figure, a slide pin 24 movable in the axial direction is disposed on the lower mold 22, and the lower mold 22 and the forked pin 24 and the first upper mold 26 form a first cavity 30 corresponding to the shape of the handle body 28 of the regulator handle to be manufactured, as shown in FIGS. 7 and 8. A cylindrical shaft portion 32 is integrally formed at the tip of the handle body 28, and this shaft portion 32 has a tapered shape whose diameter gradually decreases toward the tip, and the first cavity 30 also has a similar shape. is formed.

In addition, the lower mold 22. A second cavity 40 corresponding to the shape of the rotation knob 38 is formed around the shaft portion 32 of the handle body 28 by the slide pin 24, the formed handle body 28, the second upper die 34, and the split die 36. . The first upper mold 26 and the second upper mold 34 are provided with springs) Li, 42 and 44, respectively, and launches 46 and 4B between the lower mold 22 and the lower mold 2.
2 and the split mold 36 are provided with gates 50 and 52, respectively, so that a predetermined resin material can be injected into the cavity 30 or 40 from an injection device such as a two-color molding machine (not shown).

Note that 54 and 56 are ejector pins for ejecting the solidified resin material. Also, these figures only show the part related to the tip end of the regulator handle.
The proximal end side is omitted.

First, as shown in FIG. 6(a), a first injection molding operation is performed with the lower mold 22 and the first upper mold 26 abutted against each other and clamped together to form the first cavity 30. The inside is filled with a predetermined resin material to form the handle body 28. Next, as shown in FIG. 6(b), the first upper mold 26 is separated from the lower mold 22, and the sprue 4
2. The solidified resin material in the runner 46 and gate 50 is ejected by the ejector bin 54, and the slide pin 24 is lowered by a certain distance. After that, Figure 6 (C
), insert the split mold 36 into the handle body 28.
With the second upper mold 34 butted against the lower mold 22 and clamped, a second injection molding operation is performed to fill the second cavity 40 with a predetermined resin material. and forms the rotation knob 38.

Here, an inward protrusion 58 is formed at the tip of the shaft portion 32, and an outward protrusion 60 that engages with the protrusion 58 is formed on the rotary knob 38, so that the shaft portion 32 of the rotary knob 38
It is prevented from coming off. In addition, by selecting a resin material that has a smaller shrinkage rate and a lower solidification temperature than the resin material that forms the handle body 28 as the resin material forming the rotary knob 38, it is possible to An appropriate gap is formed between the inner circumferential surface of the rotary knob 38 and the outer circumferential surface of the shaft portion 32, allowing the rotary knob 38 to rotate freely relative to the shaft portion 32, and preventing both resin materials from welding. . Furthermore, since the shaft portion 32 has a tapered shape on the upper side, the shrinkage error of the resin material can be absorbed by the effect of the inclined surface.

According to the manufacturing method described above, since the rotation knob 38 is formed on the outside of the shaft portion 32 using the handle body 28 as an insert member, when the shaft portion 32 and the rotation knob 38 are formed separately, their dimensions are The rattling and rotational failure of the rotary knob 38 caused by errors are eliminated. In addition, since the rotary knob 38 is formed assembled to the handle body 28, there is no need to assemble both parts, and
It becomes possible to provide the shaft portion 32 with sufficient strength, and the operability of the miregulator handle is improved.

Problems to be Solved by the Invention However, even in the regulator handle manufactured by the above-mentioned manufacturing method, the rotary knob cannot rotate smoothly and freely with respect to the shaft portion, and fully satisfactory operability cannot be obtained. There wasn't. That is, during the second injection molding operation shown in FIG. Since it is injected under high pressure, the portion of the shaft portion 32 of the handle body 28 that is already solidified, which faces the gate 52, becomes soft and collapses. Therefore, a concave portion is formed on the outer circumferential surface of the shaft portion 32, and a convex portion corresponding to the concave portion is formed on the inner circumferential surface of the rotary knob 38. As a result, the free rotation of the rotary knob 38 with respect to the shaft portion 32 is impaired.

Means for Solving the Problems The present invention has been made to solve these problems, and is characterized by a handle body having a cylindrical shaft integrally at the tip. , after being formed in a first injection molding operation, the handle body is used as an insert member and is freely rotatably engaged with the shaft portion of the handle body so as to cover the outer circumference of the shaft portion. By forming a bottomed cylindrical rotary knob in a second injection molding operation, when manufacturing a regulator handle for a vehicle, the cylindrical shaft portion at the tip of the handle body is formed so that a portion of the cylindrical wall portion thereof is While the notched shape is injection molded, in the second injection molding operation, a predetermined resin is injected through a runner toward a core mold positioned in the notch of the shaft, and the shaft is The cavity formed around the rotating knob corresponds to the shape of the rotary knob.

EXAMPLE Hereinafter, an example of the present invention will be described in detail based on the drawings. Incidentally, parts common to the embodiments shown in FIGS. 6 to 8 are given the same reference numerals and detailed explanations will be omitted.

First, FIG. 1 is a process diagram illustrating an example of the manufacturing method according to the present invention. FIG. 1(a) shows the first injection molding process, and FIG. 1(b) shows the second injection molding process. These correspond to (a) and (C) in FIG. 6, respectively.

In FIG. 1, the lower mold 62 and the first upper mold 26 are butted against each other to form a first cavity 66 corresponding to the shape of the handle body 64 of the regulator handle shown in FIG. Of the lower mold 62, a core portion 70 forming a core mold for molding the shaft portion 68 of the handle body 64 has a portion facing the gate 52 into which the resin material is injected in the second injection molding process. , a protrusion 72 is formed that protrudes toward the outer circumferential side so as to be in close contact with the molding surface of the first upper mold 26. For this reason, a notch 74 is also formed in a portion of the cylindrical wall portion of the shaft portion 68 of the handle body 64 corresponding to the protrusion portion 72 thereof. Note that the handle body 64 is formed in exactly the same shape as the handle body 28 except for the notch 74, and the shaft portion 68 also has a tapered shape whose diameter gradually decreases toward the distal end.

Further, in a state where the handle body 64 is placed on the lower mold 62, the split mold 36 and the second upper mold 34 are arranged,
Further, by lowering the slide pin 24 by a certain amount, a second cavity 40 corresponding to the shape of the rotary knob 38 shown in FIGS. 7 and 8 is formed around the shaft portion 68, as described in the sixth embodiment. It is exactly the same as the case shown in the figure.

Note that FIGS. 1 and 2 only show the portions related to the distal end side of the regulator handle, and the proximal end side is omitted.

When manufacturing a regulator handle using the lower mold 62 configured as described above, first, as shown in FIG. One injection molding operation is performed to form the handle body 64, followed by the sprue 42. After draining the resin material in runner 46 and gate 50, a second injection molding operation is performed to form rotary knob 38, as shown in FIG.

Here, during the second injection molding operation shown in FIG. Since it is received by the outer circumferential surface of the protrusion 72, there is no risk of unevenness being formed on the sliding surface of the shaft portion 68 of the handle body 64 and the rotation knob 38 due to the injection pressure or the temperature of the resin material. , smooth free rotation of the rotation knob 38 relative to the shaft portion 68 is ensured.

Note that the notch 74 formed in the shaft portion 68 is almost entirely formed in the rotary knob 3.
8, so the appearance of the regulator handle is not impaired.

Furthermore, the resin material used in the second injection molding operation is
In the first injection molding process, the resin material has a smaller shrinkage rate and a lower solidification temperature than the resin material forming the handle body 64, and since the shaft portion 68 has a tapered shape, the rotary knob 38 and the shaft An appropriate gap is formed between the rotary knob 38 and the rotary knob 68 to allow free rotation of the rotary knob 38, just as described above.

Furthermore, in the above example, the protrusion 60 that engages with the shaft portion 68 is formed on the rotary knob 38 by moving the slide pin 24 in the axial direction, so there is an advantage that the device can be easily configured. .

Next, an example of another regulator handle that can be suitably manufactured by the method of the present invention will be described based on FIGS. 3 and 4.

In these figures, 76 is the tip of the handle body, and a cylindrical shaft 78 is integrally provided upright thereon. A notch 80 is formed in the cylindrical wall of the shaft portion 78, and in the second injection molding process for forming the rotation knob 82, a core mold for molding the shaft portion 78 is used, as in the case of the above example. is exposed at the position of the notch 80, and resin material is injected toward this core mold.

Furthermore, an engagement tube 84 having a small diameter cylindrical shape is provided inside the cylinder of the shaft section 78 from the tip side of the shaft section 78, and a plurality of slits 86 are formed in the engagement tube 84 in the axial direction. There is. On the other hand, the rotation knob 82 is provided with an engagement shaft portion 90 having an outward flange 88 that engages with the distal end of the engagement tube 84 to prevent the rotation knob 82 from being removed from the shaft portion 78 . Note that a plurality of notches 92 are formed in the outer peripheral portion of the outward flange 88.

According to such a regulator handle, the engagement tube 84
Since a slit 86 is formed in the slit 86 to allow elastic deformation in the axial and radial directions, the rotational resistance caused by the engagement between the engagement cylinder 84 and the engagement shaft portion 90 is alleviated, and rotation is prevented. Even smoother free rotation of the knob 82 can be achieved.

Although one embodiment of the present invention has been described above based on the drawings,
The invention can also be implemented in other embodiments.

For example, in the above embodiment, the first and second injection molding operations are performed using the common lower mold 62, but the injection molding operations may be performed using different molds. Of course, the above-mentioned device is merely an example of a device that can suitably carry out the present invention.
The present invention can also be implemented using various other devices.

Further, the regulator handle manufactured in the above embodiment is just an example, and for example, the regulator handle shown in the conventional example shown in FIG. As long as the regulator handle is equipped with a bottomed cylindrical rotary knob that is provided to cover the outer periphery and freely rotatably engages with the shaft part, this standard can be used even when manufacturing regulator handles of other shapes. The manufacturing method of the invention can be effectively applied.

Furthermore, in the above embodiment, in the second injection molding process for forming the rotary knob 38, a resin material having a smaller shrinkage rate and a lower solidification temperature than the resin material used to form the handle body 64 is used. By further reducing the taper angle of the shaft portion 68, a gap is formed between the inner circumferential surface of the rotary knob 38 and the outer circumferential surface of the shaft portion 68 due to the effect of the inclined surface, so that the handle body 64 is formed. It is also possible to use a resin material having a shrinkage rate that is the same as or slightly higher than that of the resin material.

Further, after the handle body 64 has solidified and cooled sufficiently,
By performing the second injection molding operation, even if a resin material having a solidification temperature that is the same as or slightly higher than that of the resin material used to form the handle body 64 is used, the rotary knob 38 can be attached to the handle body 64. It will not be welded to the shaft portion 68.

In addition, it goes without saying that the present invention can be implemented in various modifications and improvements based on the knowledge of those skilled in the art without departing from the spirit thereof.

Effects of the Invention As detailed above, according to the manufacturing method of the present invention, during the second injection molding operation for forming the rotary knob, the predetermined resin injected into the cavity through the runner is injected into the handle body. Since it is received by the core mold located in the notch formed in the shaft, irregularities are formed on the outer peripheral surface of the shaft and the inner peripheral surface of the rotary knob due to the injection pressure and temperature of the resin. There is no risk and smooth free rotation of the rotary knob around the shaft is ensured.

[Brief explanation of drawings]

FIG. 1 is a process diagram illustrating an embodiment of the present invention. FIG. 2 is a perspective view showing a part of the handle body manufactured in the process of FIG. 1. FIG. 3 is a sectional view of a main part showing another example of a regulator handle manufactured according to the present invention. FIG. 4 is an exploded cross-sectional view of the regulator handle of FIG. 3. FIG. 5 is a partially cutaway exploded view showing an example of a conventional regulator handle. FIG. 6 is a process diagram illustrating an example of a prior art method for manufacturing a regulator handle. 7 and 8 are a sectional view and a perspective view, respectively, showing the main parts of the regulator handle manufactured by the manufacturing method shown in FIG. 6. 38.82 = Rotation knob 40: Second cavity 64.7
6: Handle body 66: First cavity 68.78n Shaft part 70: Core part (core type)? 4,80: Notch (notch part) Applicant: Kojima Press Kogyo Co., Ltd. (a) Figure 1 (b) Figure 2, Figure 5, Figure 7, Figure 8

Claims (1)

[Claims] A handle body that integrally has a cylindrical shaft portion at its tip,
After being formed in the first injection molding operation, the handle body is used as an insert member, and a member is rotatably engaged with the shaft portion of the handle body so as to cover the outer circumference of the shaft portion. By forming the bottom cylindrical rotary knob in a second injection molding operation, when manufacturing the regulator handle for a vehicle, the cylindrical shaft portion at the tip of the handle body is partially cut off from the cylindrical wall portion. While injection molding is done in the missing shape,
In the second injection molding operation, a predetermined resin is injected through a runner toward a core mold located in a notch of the shaft, and a mold is formed around the shaft.
A method for manufacturing a regulator handle for a vehicle, characterized in that a cavity corresponding to the shape of the rotary knob is filled with the material.