JPH0746829Y2 - Fitting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to the provision of a joint used for a ball joint, a bead chain, etc. More specifically, it is suitable for easy plastic molding and brings about the desired joint strength. The present invention relates to the provision of a fitting having an easy structure.

[Prior Art] In general, ball joints or bead chains having various shapes or structures adapted to their respective purposes are widely used in various fields.

When the strength of each joint is particularly required, the male member having the spherical portion and the female member for accommodating the spherical member are separately molded, and the female member has the spherical portion of the male member. It has been attempted to block the hole of the female member in which the spherical portion is fitted with another member so that the spherical portion does not come out of the female member after the fitting.

A ball joint or bead chain having such a structure has the advantages that the strength of engagement between male and female can be set arbitrarily and the degree of contact between the male and female members at the fitting portion can be set arbitrarily, but parts There is an inconvenience that the cost and the assembly cost are relatively high.

Therefore, it has been attempted to prepare a male member having spherical portions at both ends and a metal plate that wraps the male member, and form the chains by wrapping each spherical portion with the metal plate.

Chains formed in this way have the advantage that the strength of the joint can be set arbitrarily by adjusting the thickness of the metal plate used and the degree of rolling into the spherical portion. On the other hand, it has the advantage of being able to be formed, but on the other hand, there is a disadvantage that rust is generated from the rolled-in plate edge of the metal plate and the contact surface of the male and female members.

From this point of view, it has been attempted to make the male and female joints made of plastic and provide ball joints or bead chains by the method of plastic molding.

The typical method for forming a ball joint or bead chain is to form a female fitting having a hole in which the spherical portion of the male fitting fits, and then join the female fitting by a two-color continuous forming method. By forming a male joint having a spherical portion in the assembled state by plastic molding, an inexpensive ball joint or bead chain which does not rust is provided.

[Problems to be solved by the invention] However, in the ball joint or bead chains constructed by such a method, the hole of the female joint fitting in which the spherical portion of the male joint fitting is accommodated is "forced removal" of the mold. Since it is formed by a method, it may cause a difficulty in continuous and smooth molding of the female joint tool, and since the constricted portion of the hole entrance is formed by a forceful removal method, this hole entrance constriction is formed. There was a limit to the degree of Mari.

As a result, the spherical portion of the male joint formed in the hole of the female joint is locked only at the constricted portion of the hole inlet formed by this type of force removal, and the mutual coupling of the joints is prevented. There is an inconvenience that a strong engagement state cannot be obtained.

In view of the disadvantages of such conventional ball joints or bead chains, the joint device according to the present invention is intended to provide a plastic joint device that is easy to mold and has a strong engagement between male and female joints. There is.

[Means for Solving the Problems] In the fitting according to claim 1, the fitting according to the present invention achieves the above object. In the fitting according to claim 1, the male fitting A and the female fitting B are made of plastic. First, the male joint tool A is connected to the neck 1.
The bulging head 2 provided at the end of the neck portion 1 and having a circular cross section in a direction orthogonal to the neck portion 1 is assumed to be used. The plastic molding material of the female joint B is made to cover the maximum diameter portion M of the enlarged head 2 from the side opposite to the neck portion 1, and the plastic molding material of the male joint A is formed. It is composed of a lower melting point plastic molding material.

In the joint tool of claim 2, the enlarged head 2 of the male joint tool A is formed into a spherical shape to form the joint tool.

In the joint tool of claim 3, both the male joint tool A and the female joint tool B are made of plastic, and the male joint tool A has a neck portion 1.
And is integrally provided at the end of the neck 1, and the neck 1
It is assumed that the cross section of the direction orthogonal to is an enlarging head 2 having a circular diameter, and the female joint tool B communicates with the hole 3 having a diameter smaller than the diameter of the neck portion 1 described above. , And a window hole 4 which is transparently provided in a direction orthogonal to the hole 3,
Further, the neck portion 1 of the male joint tool A projects outward from the hole 3 of the female joint tool B, and the enlarged head portion 2 of the male joint tool A is housed in the window hole 4 of the female joint tool B. In this configuration, the plastic molding material of the female joint tool B is made of a plastic molding material having a melting point lower than that of the plastic molding material of the male joint tool A.

Next, in the joint of claim 3, the peripheral surface of the enlarged head 2 on the side opposite to the neck portion 1 of the male joint A and the window 4 of the female joint B in which the enlarged head 2 is housed. A gap 5 is provided between the peripheral wall and the peripheral wall in the transparent direction.

[Operation] The fitting according to the present invention has a characteristic structure as described above, in particular, the enlarged head 2 of the male fitting A has a circular cross section in a direction orthogonal to the neck 1, and is opposite to the neck 1. Since the female fitting A is configured so as to cover the enlarging head 2 beyond the maximum diameter portion M of the enlarging head 2 from the side, the male fitting A is It is possible to rotate and twist with the enlarging head 2 as a pivot point.

Further, since the plastic molding material forming the male joint tool A is a plastic molding material having a higher melting point than the plastic molding material forming the female joint tool B, this male joint tool is molded after the male joint tool A is molded. Female fitting B around tool A
Even when the above is formed, the contact surface between the male joint tool A and the female joint tool B is not fused and is in a cut surface state.

Furthermore, the female joint B covers the enlarged head 2 from the side opposite to the neck 1 beyond the maximum diameter portion M of the enlarged head 2 of the male joint A, or the neck of the male joint A. Part 1 is a huge head 2
As a configuration in which the enlarged head 2 of the male fitting A is housed in the window 4 of the female fitting B in a state of being projected outward from the hole 3 of the female fitting B having a diameter smaller than the diameter of Therefore, the male fitting A does not slip out of the female fitting B.

Further, in the joint tool of claim 3, the hole 3 of the female joint tool B and the window hole 4 are provided in a direction orthogonal to each other, and the window hole 4
Since the male / female joint tool is configured so that the neck part 1 projects from the hole 3 so that the enlarging head part 2 is housed in the male joint tool A, the male joint tool A rotates the neck part 1 about the axis and Twisting motion with a pivot point is possible.

Furthermore, a gap 5 between the surface of the enlarged head 2 on the side opposite to the neck portion 1 and the peripheral wall of the female joint B in which the enlarged head 2 is housed in the transparent direction of the window hole 4 is formed. Prevents the female joint tool B from excessively contacting each other due to shrinkage that occurs after molding.

[Embodiment] An embodiment of a typical fitting according to the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 3 show typical embodiments of the fittings of claims 1 and 2, wherein the male fitting A and the female fitting B are made of plastic and the male fitting is made. The plastic molding material of the tool A is made of a synthetic resin material having a melting point higher than that of the plastic molding material of the female joint tool B.

The formed male joint A has a configuration in which spherical enlarging heads 2 are provided at both ends of a neck 1 having a circular cross section, and in particular, the section of the enlarging head 2 orthogonal to the neck 1 has a circular diameter. It is designed to be.

The male joint tool A is used as an ambassador, and the female joint tool B has hollow spherical or hollow hemispherical receiving portions 7 that cover all or part of the peripheral surface of the enlarged head 2 of the male joint tool A back to back. It is configured as a unit through the reduced diameter portion 6.

Then, the receiving portion 7 of the female joint tool B, from the side opposite to the neck portion 1 of the enlarged head 2, exceeds the maximum diameter portion M of the enlarged head 2 indicated by the line segment mm, It is configured to cover the bulging head 2, and how much the edge 7a 'of the receiving portion 7 is extended from the position of the maximum diameter portion M to the neck 1 side,
Determined according to the degree of swing required for the male fitting A.

In the embodiment of the fitting shown in FIG. 1, the edge 7a 'of the receiving portion 7 of the female fitting B is slightly extended from the maximum diameter portion M of the enlarged head 2 to the neck 1 side. The male joint tool A is configured to be rotated in the z direction on the axis of the neck portion 1 and to be able to swing greatly in any of xx and yy directions.

On the other hand, in the embodiment of the fitting shown in FIG. 2, the receiving portion 7 of the female fitting B has the enlarged head 2 of the male fitting A excluding the neck 1.
Is covered over substantially the entire surface, and the male joint tool A is configured to swing slightly in addition to rotating in the z direction on the axis of the neck 1.

Further, in the embodiment of the fitting shown in FIG. 3, the receiving portion 7 of the female fitting B also covers the surface of the neck 1, and the male fitting A rotates only in the axis z direction of the neck 1. It is as a configuration.

Since the plastic molding material of the male joint tool A is a plastic molding material having a higher melting point than the plastic molding material of the female joint tool B, the injection molding of the male joint tool A is performed first. After molding, it is possible to mold the female joint B by a two-color continuous molding method, and the contact surface between the male joint A and the female joint B of the continuously molded joint is , "Faces" of each other due to the characteristics of the surface skin layer of the male fitting A having a high melting point which is molded first and the shrinkage of the female fitting B which is molded later after molding.
And the enlarged head 2 of the male fitting A is replaced by the receiving portion 7 of the female fitting B.
The expanded head 2 is configured to be able to roll in a state of being closely fitted inside.

When the plastic molding material of the fitting described above was molded into male fitting B with polyacetal and into male fitting A as nylon 66, the melting point of nylon 66 (about 210 ° C) was higher than that of polyacetal (about 170 ° C). Remarkably high, the joint surfaces of the male fitting A and the female fitting B at the time of molding were completely cut off, and the male fitting A had a smooth movement with respect to the female fitting B.

It should be noted that the enlarged head 2 of the male joint A on the top may be any shape other than a spherical shape, such as an oval shape or a conical shape, as long as the cross section orthogonal to the neck portion 1 is circular. Also, neck 1
The cross section may have a polygonal shape other than the circular shape.

Further, the female fitting B shows the most typical one such as a bead chain, but the outer shape may be any shape, and the male fitting A is received on one side, The configuration may be such that three or more male fittings A are received.

FIGS. 4 to 9 show the fittings according to claims 3 and 4, which basically have the same configuration as the fittings described above, and a male-female fitting accompanying two-color continuous molding. This is an attempt to eliminate the close contact between the tools.

In the fitting of this embodiment, after the male fitting A is molded by plastic, the fitting 2 is formed by the two-color continuous molding method so that the enlarged head 2 of the male fitting A can be accommodated in the window hole 4 of the female fitting B. The male fitting A has a structure suitable for molding
And the female joint tool B are molded using a plastic molding material having a lower melting point than the plastic molding material of the male joint tool A so that the plastic molding material of the female joint tool B is suitable for the two-color continuous molding method.

Particularly, in the fitting tool of this embodiment, the female fitting tool B has a window hole 4 that is optimal for forming the female fitting tool B by the two-color continuous molding method so as to wrap around the enlarged head 2 of the male fitting tool A. The present invention relates to the structure of the joint portion of the joint tool described above, and may be configured as a general ball joint. Further, the male and female joint tools A and B are continuously configured like bead chains. Is also good.

The fitting shown in FIGS. 4 to 7 is one embodiment in which the present embodiment is shown in a chain shape, and a male fitting A having spherical enlarged heads 2 and 2 at both ends of a neck 1. And the reduced diameter part 6 in the center
And a female joint tool B having a pair of hollow hemispherical receiving portions 7, 7 whose spherical top end side is continuously provided.

The edge of each hemispherical receiving portion 7 of the female fitting B
A hole having a diameter narrower than the diameter of the enlarged head 2 of the male fitting A and at least wider than the diameter of the neck 1 from the side of the flat surface 7a on the side 7a ′ toward the side of the reduced diameter portion 6. 3 is provided, and a window hole 4 in a direction orthogonal to the hole 3 is transparently provided in the receiving portion 7, and the enlarging head 2 of the male joint tool A is housed in the window hole 4. , And the male fitting A from the hole 3
The neck portion 1 is configured to protrude.

Further, the hole 3 of the female fitting B has a rounded surface 3a which is in close contact with the spherical surface of the enlarged head 2 on the side of the neck 1 of the male fitting A housed in the hole 3, The rounded surface 3a serves as a receiving portion that is in close contact with the enlarged head 2 of the male joint tool A.

Further, the window hole 4 communicating with the hole 3 and being provided in a direction orthogonal to the hole 3 has a substantially semicircular shape, and the inner peripheral wall 4a of the window hole 4 has one side A flat surface is formed from one opening side to the other opening side, and a gap 5 is provided between the inner peripheral wall 4a and the spherical surface of the enlarged head 2.

As a result, the female fitting A assembled in the female fitting B receives a force in the pulling direction with the spherical surface of the enlarged head 2 in contact with the rounded surface 3a of the hole 3 of the female fitting B. , The female joint tool B and the male joint tool A are twisted in a state where they are attracted to each other to form a freely bendable joint part, and the male joint tool A
By pushing into the female joint tool B within the range of the gap 5, the twisting and bending operations can be made smoother and the joint portion having a large bending width can be obtained.

In the fitting having such a configuration, one side of the enlarged head 2 of the male fitting A housed in the female fitting B is in contact with the rounded surface 3a of the hole 3 of the female fitting B. At the same time, the other side of the enlarged head 2 is positioned in the window hole 4 of the female joint tool B, and the window hole 4 extends from one side surface of the receiving portion 7 of the female joint tool B to the other side. Since the male joint A is formed first, the female joint B can be easily formed by the two-color continuous forming method because the male joint A is formed first.

When forming a fitting by this two-color continuous molding method, first of all, after molding the male fitting A, a resin fitting having a different melting temperature is used to cover the enlarged head 2 of the male fitting A. By molding the tool B portion, the joint surface of the male and female joint tool at the time of molding is cut off. When molding the female joint tool B, the molding die is pulled out in the directions of the arrows F, F to form the window hole 4 in which the enlarging head 2 is housed. The surfaces other than the surfaces are separated from the female joint tool B.

As a result, the contraction of the female joint B after molding does not hinder the sliding movement of the enlarged head 2 of the male joint A, and the hole 3 of the female joint B is inserted into the enlarged head of the male joint A. It is possible to form a shape in close contact with No. 2, and the locking property in the pulling direction of the male and female joint tool is particularly good.

In forming the window hole 4, the inner peripheral wall 4a of the window hole 4
When a large gap 5 is provided between the and the spherical surface of the enlarging head 2, the molding by the above molding method becomes easier, and the flexibility of the constructed male and female joint tool becomes smoother.

The joint of the embodiment shown in FIG. 8 is intended to further enhance the flexibility of the female and male joints, and the enlarged head 2'of the male joint A is formed into a hemispherical shape, and is provided from both sides of the female joint B. The holes 3 and 3 are communicated with each of the holes 3 and 3 substantially in the middle thereof.
Moreover, the window hole 4 is provided so as to be orthogonal to the holes 3 and 3, and the enlarged head 2'of the male joint tool A is accommodated in the window hole 4.

In the joint tool of the embodiment shown in FIG. 9, the female joint tool B has a fixing means, and is used as a general universal joint section or the like in which the female joint tool B is attached and fixed to a wall, a device or the like. In the inner side of the hole 3 in which the enlarged head 2 of the male joint tool A is accommodated, a window hole 4 communicating with the hole 3 and orthogonal to the hole 3 is provided. A portion of the enlarged head 2 opposite to the neck portion 1 is housed in the window 4 to form a joint tool.

In the case of a joint tool that does not require a function as a smooth universal joint, the enlarging head 2 may have a shape having no spherical portion such as a conical shape or a disc shape.

[Effects of the Invention] The fitting according to the present invention has a structure suitable for molding the male fitting A first and then the female fitting B by the two-color continuous molding method because of the characteristic structure described above. , Which is a plastic joint and has a function as a smooth universal joint and is free from rust.

Further, when the female joint B is formed by the two-color continuous molding method after the male joint A is first formed, the degree of coupling strength of the male and female joints can be freely set, and the female and male joints can be robustly formed. It is possible to provide linked chains.

Furthermore, in the fittings of claims 3 and 4, the female fitting B
Since there is no tightening on the male joint A due to contraction after molding, the flexibility of the female and male joints is not particularly impaired.

Furthermore, when the female joint tool B is molded by the two-color continuous molding method after the male joint tool A is molded first, the molding die of the female joint tool B may be a two-sided mold, and the die cost is low. In addition to the advantages described above, the shape of the female joint tool B can be freely changed because of the molding characteristics of the female joint tool B.

From the above point of view, the joint according to the present invention can be used in all directions as a universal joint such as a ball joint or a bead chain.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a fragmentary side view showing a typical embodiment of the invention of claim 1, and FIGS. 2 and 3 are fragmentary side views showing another embodiment. FIGS. 4 and 5 are perspective views showing a typical embodiment of the invention of claim 3, FIG. 5 is a perspective view of the same parts separated, FIG. 6 is a front view of the same portion cut away, and FIG. Top view, 8th
FIG. 9 is a partially cutaway front view showing another embodiment, and FIG. 9 is a main part front view showing still another embodiment. 1 ... neck, 2 ... enlarged head, 3 ... hole, 4 ... window hole,
5 ... Gap, 6 ... Reduced part, 7 ... Receiving part, A ... Male fitting, B ... Female fitting.

Claims (4)

[Scope of utility model registration request] 1. A male joint tool having at least a neck and an enlarged head provided at an end of the neck and having a circular cross section in a direction orthogonal to the neck; And a female joint that covers at least the maximum diameter portion of the enlarged head from the side opposite to the male joint, and the male joint and the female joint are made of plastic, and a plastic molding material for the female joint. Is a plastic molding material having a melting point lower than that of the plastic molding material of the male fitting. 2. The fitting according to claim 1, wherein the enlarged head of the male fitting is spherical. 3. A plastic male fitting having at least a neck and an enlarged head provided at an end of the neck and having a circular cross section in a direction orthogonal to the neck, and the male fitting described above. A hole with a diameter smaller than the diameter of the enormous head,
A female female fitting made of plastic having a diameter larger than the diameter of the enlarged head portion and communicating with the hole, and having a window hole penetrating in a direction orthogonal to the hole. The plastic molding material of the fitting is a plastic molding material having a lower melting point than the plastic molding material of the male fitting, and the neck portion of the male fitting projects outward from the hole of the female fitting, and A joint tool characterized in that an enlarged head of the joint tool is housed in a window hole of the female joint tool. 4. Between the peripheral surface of the enlarged head on the side opposite to the neck of the male joint tool and the peripheral wall of the window hole of the female joint tool in the transparent direction of the window hole. The fitting according to claim 3, wherein a gap is provided in the joint.