JP6355062B2 - Hinge manufacturing method - Google Patents

Description

The present invention relates to a method for producing a hinge.

  In Patent Document 1, several cylindrical shaft support portions and cylindrical shaft insertion portions that mesh with each other on adjacent end faces of a pair of blades are formed, and another cylindrical shaft insertion portion is formed in the columnar shaft support portion at the center. There is described a plastic hinge in which a support shaft penetrating the central axis of the part is integrally provided.

JP 09-209644 A

  An object of the present invention is to provide an inexpensive hinge by integrally molding using resins having different melting points.

The hinge which concerns on a 1st aspect has the 1st board which has an axis | shaft in the 1st protrusion which protrudes from an edge part, and the 2nd board which has the hole which the said shaft penetrates in the 2nd protrusion part which protrudes from an edge part. The first plate and the second plate are made of resins having different melting points.

A hinge according to a second aspect is the hinge according to claim 1, wherein the second plate covers an end of the shaft.

The hinge according to the third aspect is characterized in that, in the hinge according to claim 1 or 2, the resin constituting the second plate has a molding shrinkage ratio larger than that of the resin constituting the first plate. To do.

The hinge according to the fourth aspect is characterized in that, in the hinge according to claim 1 or 2, the resin constituting the second plate has a molding shrinkage rate smaller than that of the resin constituting the first plate. To do.

The hinge manufacturing method according to the fifth aspect includes a first step of forming a first plate having a shaft at a first protrusion protruding from an end portion with a resin, and the shaft at a second protrusion protruding from the end portion. And a second step of forming a second plate having a through-hole with a resin having a melting point lower than that of the resin.

According to a first aspect of the present invention, there is provided a hinge manufacturing method comprising: a first step of forming a second plate having a hole in a second protrusion protruding from an end portion with a thermoplastic resin; and the first protrusion protruding from the end portion. a first plate having an axis passing through the holes rather low melting point than the thermoplastic resin, and having a second step of molding the molding shrinkage is less thermoplastic resin.

The hinge manufacturing method according to claim 2 is the hinge manufacturing method according to claim 1 , wherein the second plate covers an end of the shaft.

The hinge manufacturing method according to the sixth aspect is the hinge manufacturing method according to the fifth aspect , wherein the resin constituting the second plate has a larger molding shrinkage ratio than the resin constituting the first plate. Features.

The hinge manufacturing method according to the seventh aspect is the hinge manufacturing method according to the fifth aspect , wherein the resin constituting the second plate has a smaller molding shrinkage than the resin constituting the first plate. Features.

According to the hinge of the first aspect , an inexpensive hinge can be provided.

According to the hinge of the 2nd mode , it can control that dust comes out from a hinge.

According to the hinge of the third aspect , the gap between the shaft and the hole (bearing) can be reduced to prevent rattling.

According to the hinge of the fourth aspect , the movement between the first plate and the second plate can be made smooth by increasing the gap between the shaft and the hole.

According to the hinge manufacturing method of the fifth aspect, the hinge can be manufactured at low cost.
According to the hinge manufacturing method of the first aspect, the hinge can be manufactured at low cost, and the hinge that suppresses rattling can be manufactured by reducing the gap between the shaft and the hole (bearing).

According to the hinge manufacturing method of claim 2 , it is possible to manufacture a hinge that suppresses the generation of dust.

According to the hinge manufacturing method of the sixth aspect, a hinge that suppresses rattling can be manufactured by reducing the gap between the shaft and the hole (bearing).

According to the hinge manufacturing method of the seventh aspect , since a gap can be formed between the shaft and the hole, a hinge in which the first plate and the second plate move smoothly can be manufactured.

(Example 1) which is a perspective view of a hinge. (Example 1) which is a top view of a hinge. (Example 1) which is a top view of the 1st board | plate of a hinge. (Example 1) which is a top view of the 2nd board of a hinge. (Example 2) which is a perspective view of a hinge. (Example 2) which is a top view of the 1st board | plate of a hinge. (Example 2) which is a top view of the 2nd board of a hinge. (Example 3) which is a top view of a hinge.

  Embodiments of the present invention will be described with reference to the drawings.

〔overall structure〕
As shown in FIGS. 1 to 4, the hinge 1 according to the present invention has a first plate 4 having a shaft 3 at a first protrusion 2 protruding from an end portion and a shaft at a second protrusion 5 protruding from the end portion. 3 is provided with a second plate 7 having a hole 6 therethrough. Further, the hinge 1 is formed with a plurality of mounting holes 8 for fixing to a pillar or the like using a countersunk screw or the like. The mounting hole 8 is formed with a counterbore 9 for preventing a screw head such as a flat head screw from protruding from the surfaces of the first plate 4 and the second plate 7.

  As shown in FIGS. 1 to 3, columnar shafts 3 are formed on both sides in the axial direction of the substantially cylindrical first protrusion 2 in the first plate 4. The first plate 4 having the first protrusion 2 and the shaft 3 is molded by a resin having a different melting point from the resin constituting the second plate 7 as will be described later.

  As shown in FIGS. 1, 2, and 4, the second protrusion 5 of the second plate 7 surrounds the shaft 3 and has a function as a bearing of the shaft 3. As will be described later, the second plate 7 having the substantially cylindrical second protrusion 5 is molded by a resin having a melting point different from that of the resin constituting the first plate 4.

[Production Method 1]
The manufacturing method 1 as an example of the manufacturing method of the hinge 1 is demonstrated.
First, a molten thermoplastic resin A is injected into a cavity β (not shown) of a mold α (not shown), and a first plate 4 having a shaft 3 on a first protrusion 2 protruding from an end (see FIG. 3) is molded by an injection molding method (first step).

  Next, after inserting the first plate 4 (FIG. 3) into a cavity δ (not shown) of a mold γ (not shown) different from the mold α, the molten thermoplastic resin B is injected, and the end A second plate 7 having a hole 6 through which the shaft 3 penetrates the second protrusion 5 protruding from the portion is integrally molded by an injection molding method (second step).

  In the manufacturing method 1, the first plate 4 previously molded is inserted into the cavity δ of the mold γ to mold the second plate 7. For this reason, the thermoplastic resin A needs to have a higher melting point than the thermoplastic resin B. Examples of the thermoplastic resin A include nylon 6 (melting point: about 225 degrees), nylon 66 (melting point: about 265 degrees), and the like. Examples of the thermoplastic resin B include polypropylene (melting point: about 168 degrees), polyacetal (melting point: about 181 degrees), and the like.

  Further, the molding shrinkage rate of the thermoplastic resin B can be set larger than the molding shrinkage rate of the thermoplastic resin A. In this case, when the molten thermoplastic resin B surrounding the shaft 3 made of the thermoplastic resin A is cooled and solidified to form the second protrusion 5, the shaft 3 is tightened from around. For this reason, in the hinge 1, the gap between the outer peripheral surface of the shaft 3 and the inner peripheral surface of the hole 6 is almost eliminated, so that rattling between the first plate 4 and the second plate 7 can be reduced.

  As a combination of the thermoplastic resins in this case, as the thermoplastic resin A, nylon 6 (molding shrinkage ratio: 0.5 to 1.5), nylon 66 (molding shrinkage ratio: 0.8 to 1.5), etc. Examples of the resin B include polyacetal (molding shrinkage ratio: 2.0 to 2.5).

  Further, the molding shrinkage rate of the thermoplastic resin B can be set smaller than the molding shrinkage rate of the thermoplastic resin A. In this case, the molten thermoplastic resin B surrounding the shaft 3 made of the thermoplastic resin A is separated from the shaft 3 when the second protrusion 5 is formed by cooling and solidifying. That is, the hinge 1 has a large gap between the outer peripheral surface of the shaft 3 and the inner peripheral surface of the hole 6, so that the movement (relative movement) of the first plate 4 and the second plate 7 can be made smooth.

  As a combination of the thermoplastic resins in this case, as the thermoplastic resin A, nylon 6 (molding shrinkage ratio: 0.5 to 1.5), nylon 66 (molding shrinkage ratio: 0.8 to 1.5), etc. Examples of the resin B include polypropylene (molding shrinkage ratio: 1.0 to 2.5). Polypropylene can have a molding shrinkage of 0.2 to 0.8 when 40% by weight of glass fiber is kneaded as a filler (filler). For this reason, when using polypropylene, it is desirable to employ polypropylene containing glass fibers.

[Production Method 2]
The manufacturing method 2 as another example of the manufacturing method of the hinge 1 is demonstrated.
First, the molten thermoplastic resin A is injected into the cavity δ of the mold γ, and the second plate 7 (FIG. 4) having the holes 6 in the second protrusion 5 protruding from the end portion is formed by an injection molding method. (First step).

  Next, after inserting the second plate 7 (FIG. 4) into the cavity β of the mold α different from the mold γ, the molten thermoplastic resin B is injected, and the first protrusion 4 protruding from the end portion. The first plate 4 having the shaft 6 penetrating through the hole 6 is molded by an injection molding method (second step).

  In the manufacturing method 2, the first plate 4 is formed by inserting the previously formed second plate 7 into the cavity β of the mold α. For this reason, the melting points of the thermoplastic resins A and B are the same as those described in the production method 1, and the thermoplastic resin A needs to be higher than the thermoplastic resin B. Examples of the thermoplastic resins A and B can be the same as those exemplified in Example 1.

  Further, the molding shrinkage rate of the thermoplastic resin B can be set smaller than the molding shrinkage rate of the thermoplastic resin A. In this case, when the molten thermoplastic resin B inside the hole 6 of the second protrusion 5 made of the thermoplastic resin A is cooled and solidified to form the shaft 3, the outer peripheral surface of the shaft 3 and the hole 6 There is almost no gap on the inner peripheral surface. For this reason, the hinge 1 can reduce rattling between the first plate 4 and the second plate 7.

  The combination of the thermoplastic resins A and B in this case is nylon 6 (molding shrinkage ratio 0.5 to 1.5), nylon 66 (molding shrinkage ratio 0.8 to 1.5), etc. as the thermoplastic resin A. Examples of the plastic resin B include polypropylene (containing 40% by weight of glass fiber: molding shrinkage 0.2 to 0.8).

  Further, the molding shrinkage rate of the thermoplastic resin B can be set larger than the molding shrinkage rate of the thermoplastic resin A. In this case, when the melted thermoplastic resin b inside the hole 6 of the second protrusion 5 made of the thermoplastic resin A is cooled and solidified to form the shaft 3, the outer peripheral surface of the shaft 3 and the hole 6 A gap can be formed between the inner peripheral surfaces. For this reason, the hinge 1 can smooth the movement (relative movement) of the first plate 4 and the second plate 7.

  As a combination of the thermoplastic resins in this case, as the thermoplastic resin A, nylon 6 (molding shrinkage ratio: 0.5 to 1.5), nylon 66 (molding shrinkage ratio: 0.8 to 1.5), etc. Examples of the resin B include polyacetal (molding shrinkage ratio: 2.0 to 2.5).

  Another embodiment according to the present invention will be described with reference to FIGS. In order to make the description easy to understand, the same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The main difference between the hinge 11 of the second embodiment and the hinge 1 of the first embodiment is that the shaft 13 is formed shorter than the shaft 3 and that one end of the hole 16 where the end of the shaft 13 is located is covered with a lid. The point is that the portion 18 is formed.

  The hinge 11 includes a first plate 14 having a shaft 13 at a first protrusion 12 protruding from an end portion, and a second plate 17 having a hole 16 through which the shaft 13 passes through a second protrusion 15 protruding from the end portion. ing.

  As shown in FIGS. 5 and 6, columnar shafts 13 are formed on both sides in the axial direction of the substantially cylindrical first protrusion 12 in the first plate 14. The first plate 14 having the first protrusion 12 and the shaft 13 is molded by a resin having a melting point different from that of the resin constituting the second plate 17 as in the first embodiment.

  As shown in FIGS. 5 and 7, the second protrusion 15 having the lid 18 surrounds the periphery and the end of the shaft 13, and functions as a bearing for the shaft 13. The second plate 17 having the second protrusion 15 and the lid 18 is molded by a resin having a melting point different from that of the resin constituting the first plate 14 as in the first embodiment.

The hinge 11 has the same effect as the hinge 1 of the first embodiment.
Further, since the hinge 11 is formed with the lid portion 18, the shaft 13 rotates in the hole 16, and the resin dust generated by rubbing the outer peripheral surface of the shaft 13 and the inner peripheral surface of the hole 16 is hinged. 11 can be prevented from leaking outside.

  Moreover, since the hinge 11 can suppress dust, moisture, and the like from entering the gap between the shaft 13 and the hole 16 from the outside by the lid portion 18, it also has an effect of suppressing deterioration.

  The hinge 11 can be manufactured using the same manufacturing method as the manufacturing method 1 and the manufacturing method 2 described in Example 1. Even if the hinge 11 is manufactured by the manufacturing method 1 or the manufacturing method 2, there is an effect that no burr is generated in the vicinity of the end of the shaft 13. That is, the hinge 1 of Example 1 may generate a burr that covers the end of the shaft 3 when the second plate 7 is formed by the manufacturing method 1, and the shaft 3 is formed by the manufacturing method 2. At this time, burrs may occur at the end of the shaft 3. For this reason, it is necessary to shape | mold the hinge 1 paying attention to the generation | occurrence | production of the said burr | flash. However, since the end portion of the shaft 13 is covered with the lid portion 18, the hinge 11 does not need to be formed in consideration of the generation of burrs that cover the end portion of the shaft 3.

  Another embodiment according to the present invention will be described with reference to FIG. In order to make the description easy to understand, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The main difference between the hinge 21 of the third embodiment and the hinge 1 of the first embodiment is that a lid 28 protruding outward is formed at one end of the hole 6 where the end of the shaft 3 is located. . That is, the hinge 21 is the same as the hinge 1 of the first embodiment except that the lid portion 28 is formed so as to cover the end portion so that the end portion of the shaft 3 is not exposed to the outside.

The second plate 27 having the second protrusion 25 and the lid portion 28 is molded by a resin having a melting point different from that of the resin constituting the first plate 4 as in the first embodiment.
Since the manufacturing method of the hinge 21 can employ the same manufacturing method as the manufacturing method 1 and the manufacturing method 2, detailed description thereof is omitted. Further, the hinge 21 has the same effect as that of the second embodiment.

  The above-described embodiments are illustrated for explanation, and the present invention is not limited thereto, and those skilled in the art will recognize from the claims, the detailed description of the invention, and the description of the drawings. Modifications and additions are possible without departing from the technical idea of the present invention.

  For example, although the above-mentioned Example illustrated nylon 6 or nylon 66 as the thermoplastic resin A and polypropylene or polyacetal as the thermoplastic resin B, it is not limited to these. Further, the resin may be reinforced by adding glass fibers or the like to the thermoplastic resin A and / or the thermoplastic resin B.

  Further, in the above-described embodiment, the first protrusion is one and the second protrusion is two hinges, but there may be two or more first protrusions and three or more second protrusions. . That is, the present invention can be applied to a hinge in which the number of second protrusions is N + 1 with respect to the number N of first protrusions (N is a natural number).

  Moreover, since the 1st board 4 and the 2nd board 7 are what is shape | molded using resin, by controlling shrinkage | contraction of resin by the setting of molding conditions, shakiness of a shaft and a hole is small, and The shaft and the hole can be molded so as to have an appropriate slidability.

  In the above-described embodiment, the first plate 4 and the second plate 7 are formed with circular mounting holes 8. However, the mounting hole 8 has a shape other than a circular shape, for example, a triangular shape, It may be a square shape, a star shape, or the like. Furthermore, since the hinge according to the present invention is made of resin, it can be attached to a door, a pillar, or the like by a method such as welding without providing the attachment hole 8. In other words, the hinge according to the present invention does not matter how it is attached.

  The present invention applies to hinges.

DESCRIPTION OF SYMBOLS 1 Hinge 2 1st protrusion 3 Axis 4 1st board 5 2nd protrusion 6 Hole 7 2nd board 8 Mounting hole

Claims (2)

A first step of molding a second plate having a hole in the second protrusion protruding from the end portion with a thermoplastic resin;
A first plate having an axis passing through the holes in the first protrusion that protrudes from an end portion rather low melting point than the thermoplastic resin, a second step of molding a thermoplastic resin molding shrinkage is less,
A method for manufacturing a hinge. The hinge manufacturing method according to claim 1 , wherein the second plate covers an end of the shaft.

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