JP5154521B2 - Resin spring and manufacturing method thereof - Google Patents

Description

  The present invention relates to a resin spring that is provided in an opening of a female hook into which a male hook's genko is inserted in a hook of a male and female coupling structure, and holds the genko in this opening. The present invention relates to a resin spring that can be suitably incorporated in a hook (female hook) used in a place where the occurrence of sag occurs.

  2. Description of the Related Art Conventionally, a hook having a male / female coupling structure has been widely used for an opening / closing part in daily goods such as clothes, bags, and shoes. As is well known, this hook is joined by inserting a male hook's gene into the opening of the female hook. A spring is provided in the opening of the female hook to hold the inserted lever in the opening. As a general spring, a spring wire formed by bending a metal wire is arranged in parallel in the opening of the female hook (double spring type), or a metal ring is arranged on the inner peripheral surface of the opening (Ring spring type).

  Further, the male hook has a fitting portion and a constricted portion having a smaller diameter than the fitting portion. When the male and female hooks are joined, the genco is inserted into the opening by expanding the two metal spring wires or metal rings as described above, and the genko inserted into the opening is the original part of the neck. The fitting portion is regulated in the opening by being between the two metal spring wires returned to the shape or on the inner peripheral surface of the metal ring, and is held in the opening.

  Patent Document 1 below discloses a female female hook. This female hook is provided with a plurality (three) of elastic pieces in the space surrounding the male hook's genko when the male and female are joined. The three elastic pieces are arranged substantially evenly, and each of them has an arcuate planar shape that protrudes inward to elastically hold the genko. In addition, the elastic piece is formed with a concave portion in order to make it easy to accept a genko at the approximate center of the inwardly protruding portion, and a notch for adjusting the elastic deformation force by reducing the cross-sectional area. The part is formed.

JP 2009-28182 A

  By the way, as shown in FIG. 6, when a conventional hook incorporating a metal spring is used in an interior such as a cloth or leather glove box 101 in an interior 100 of an automobile, There was a problem that metal noise was generated from the hook due to vibration generated in the automobile. The metal sound is a small sound, but it becomes annoying noise in a quiet place such as the inside 100 of the car. As shown in FIGS. 7A and 7B, such a problem is that the deformation amount of the metal spring 103 (here, the metal ring) 103 of the female hook 102 is small, and the genus 105 of the male hook 104 is inserted. The shape of the metal ring 103 is smaller than that of the fitting part 106 of the genco 104 in the coupled state of the male and female hooks 102 and 104. This is because there is a gap between the inner peripheral surface 103a.

  In addition, the resin female hook disclosed in Patent Document 1 does not make a metal sound because there is no collision between metals as in a conventional hook in which a metal spring is incorporated. Due to its specificity, the hole into which the gene is inserted becomes extremely small compared to the opening (vacant space) of the female hook. For this reason, for example, it is not suitable for coupling with a large screw such as a screw screw, and is unsuitable for use in automobile interiors.

  Therefore, in order to solve the above problems, the present invention does not make a metal sound even if a hook incorporating the hook is used in a place where vibration is generated, and is suitable for strongly coupling a male and female hook. Accordingly, it is an object of the present invention to provide a resin spring that can be suitably incorporated into a hook used for, for example, an automobile interior product, and a method for manufacturing the resin spring.

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
The resin spring according to claim 1 of the present invention is an annular resin spring 10 provided in the opening 3 of the female hook 2 into which the genus 5 of the male hook 4 is inserted, and for holding the genko 5 in the opening 3. A plurality of projecting portions 12 projecting inward are formed on the inner peripheral surface 11 at equal intervals, and are curved so that the space between the projecting portions 12 swells outward. It is characterized in that a thick portion 13 is formed behind.

  The resin spring according to claim 2 is characterized in that the eight protrusions 12 are formed on the inner peripheral surface 11.

  According to a third aspect of the present invention, there is provided a method of manufacturing the resin spring according to the first or second aspect, wherein after the molding of the resin spring 10 by the mold is completed, the plurality of ejector pins 20 provided on the mold correspond to the meat. The method includes a step of pressing the resin spring 10 in the thickness direction X in contact with the thick portion 13.

  According to the resin spring of the first aspect of the present invention, since the resin spring is incorporated into the female hook, the metal sound that occurs when a conventional metal spring is used during vibration or the like is not generated. In addition, a plurality of projecting portions projecting inward are formed on the inner peripheral surface of the resin spring, and thereby, it is possible to have an elastic force suitable for insertion / escape of Genko. Therefore, when this resin spring is incorporated in the hook, a strong binding force can be obtained. Furthermore, when the male and female are joined, the genko is inserted into the opening while expanding the inner peripheral surface of the resin spring. At this time, the resin spring spreads outward as a whole by the curved portion between the plurality of protrusions. Because it has become easier, Genko can be easily inserted. Similarly, when the male and female are separated, Genko can easily escape from the opening. Furthermore, since the thick portion is formed behind the protruding portion, the elastic force of the resin spring is increased and the durability of the resin spring is improved.

  According to the resin spring of the second aspect, the diameter of the resin spring is increased almost uniformly outward, and the resin spring has a more suitable elastic force for insertion / extraction of the lever.

  Furthermore, according to the method for manufacturing a resin spring according to claim 3, the resin spring after completion of molding by the mold can be pushed out by the ejector pin coming into contact with the thick portion formed on the resin spring. Therefore, it can be easily taken out from the mold.

It is a perspective view which shows the female hook and male hook in which embodiment of the resin spring by this invention was integrated. It is a top view which shows the same embodiment. It is a perspective view which shows the same embodiment. (A), (b) It is a bottom view which shows the operation | movement at the time of coupling | bonding of the male and female hooks of the embodiment. It is a perspective view which shows the place which extrudes the same embodiment from a metal mold | die. It is a perspective view which shows the place where the female hook incorporating the same embodiment is mainly used. (A), (b) It is sectional drawing which shows the metal springs (metal ring) in the conventional hook.

Embodiments of the present invention will be specifically described below with reference to the drawings.
As shown in FIG. 1, this embodiment is provided in an opening 3 of a female hook 2 in which a genko 5 of a male hook 4 is inserted in a hook 1 of a male and female coupling structure. An annular resin spring 10 for holding. Moreover, as shown in FIG. 6, the hook 1 is used in a place where vibration occurs, for example, in a car interior 100. Specifically, it is used for interior items such as a cloth or leather glove box 101 in the vehicle interior 100. In addition, it is used for interior parts of the vehicle interior 100 such as being attached to a seat for covering the tonneau box behind the seat in the vehicle interior 100.

  In FIG. 6, the female hook 2 is attached to the glove box 101, and the male hook 4 is attached to the lining of the vehicle interior 100. As shown in FIG. 1, the female hook 2 includes a cap portion 8 and a socket portion 9. An opening 3 is formed at the bottom of the socket portion 9, and a resin spring 10 is incorporated coaxially in the opening 3. Further, a screw genko is adopted for the genko 5 of the male hook 4. The genera 5 includes a fitting portion 6 and a constricted portion 7 having a smaller diameter than the fitting portion 6.

  As shown in FIGS. 2 and 3, the resin spring 10 incorporated in the female hook 2 has a plurality of inner springs 11 protruding inward (that is, in a centripetal direction with respect to the center O of the circle formed by the inner peripheral face 11). Projecting portions 12 are formed at equal intervals. In addition, according to the verification result of the inventor of the present invention, it was found that an even elastic force can be obtained when the number of protrusions 12 is an even number rather than an odd number. Among them, the production was easy, and substantially uniform elastic force was obtained at eight times. Therefore, in this embodiment (resin spring 10), eight projecting portions 12 are formed on the inner peripheral surface 11 with an interval of 45 degrees. In addition, even if the number of protrusions 12 is four or six, for example, an elastic force almost inferior to eight can be obtained.

  The resin spring 10 is curved so that the space between the eight protrusions 12 swells outward (that is, in the radial direction with respect to the center O of the circle formed by the inner peripheral surface 11). Further, a semi-cylindrical thick portion 13 is integrally formed on the outer peripheral surface of the resin spring 10 which is behind each protruding portion 12. The number of the thick portions 13 is eight like the protruding portions 12.

  In addition, a taper surface that becomes thinner in the thickness direction X of the resin spring 10 at each end portion at the inner front end portion of the projecting portion 12 and the outer front end portion of the curved portion between the projecting portions 12. 14a and 14b are formed.

  This embodiment (resin spring 10) is made of POM (polyacetal). In this embodiment, the maximum outer diameter is about 13.0 mm, the minimum inner diameter is about 9.65 mm, and the thickness is about 1.8 mm.

  Here, with reference to FIG. 4, the operation of the resin spring 10 when the female hook 2 and the male hook 4 in which this embodiment (resin spring 10) is incorporated will be described. In FIG. 4, only the resin spring 10 and the genko 5 are shown by solid lines.

  FIG. 4A shows that when the genko 5 of the male hook 4 is inserted into the opening 3 of the female hook 2, the fitting portion 6 of the genco 5 expands the inner peripheral surface 11 of the resin spring 10. It is in a state. At this time, the side peripheral surface of the fitting portion 6 abuts against the eight projecting portions 12 of the resin spring 10 to spread them out, but the resin spring 10 as a whole including the curved portion between the projecting portions 12 is expanded. Thus, the diameter of the socket portion 9 is increased almost uniformly outward (radiating direction with respect to the center O).

  FIG. 4B shows a state in which the genko 5 is inserted further into the opening 3 from the state of FIG. 4A, that is, a combined state of the male and female hooks 2, 4. At this time, the resin spring 10 that has been pushed and spread to the fitting portion 6 of the genco 5 so far returns to its original shape even when the constricted portion 7 having a smaller diameter than the fitting portion 6 is located, and its inner peripheral surface. 11 has a diameter reduction, and the projecting portion 12 surrounds the neck portion 7 of the genco 5 with a slight gap and restricts the fitting portion 6 (the genco 5) in the opening 3.

From here, the manufacturing method of this embodiment (resin spring 10) is demonstrated.
The resin spring 10 is manufactured by injection molding using a mold in the same manner as a normal resin molded product. The mold is provided with ejector pins 20 as shown in FIG. The ejector pin 20 is formed in a substantially cylindrical shape that matches the thick portion 13 of the resin spring 10. Further, eight ejector pins 20 are provided in the mold, and are provided at an interval of 45 degrees as in the case of the thick portion 13, and are further advanced and retracted in the thickness direction X of the resin spring 10 in the mold. It is provided freely.

  Therefore, when manufacturing this embodiment (resin spring 10), first, a step of injecting molten resin into a closed mold from a nozzle of an injection molding machine and filling the mold cavity with the molten resin is performed. Do. Next, a step of cooling the molten resin filled in the mold is performed. Molding of the resin spring 10 is completed when this process is completed. Then, after the molding of the resin spring 10 is completed, the mold is opened, and then the ejector pin 20 is brought into contact with the thick portion 13 of the resin spring 10 to advance in the thickness direction X. A step of extruding the resin spring 10 from the cavity of the mold is performed. By performing this step, the resin spring 10 can be taken out from the mold.

  According to the above-described embodiment, since the resin spring is incorporated in the female hook 2, the metal sound that occurs when a conventional metal spring is used during vibration or the like is not generated. In addition, a plurality of projecting portions 12 projecting inward are formed on the inner peripheral surface 11 of the resin spring 10, thereby having an elastic force suitable for insertion / escape of the genco 5. Therefore, when this resin spring 10 is incorporated in the hook 1, a strong coupling force can be obtained. Further, when the male and female are joined, the genko 5 is inserted into the opening 3 while expanding the inner peripheral surface 11 of the resin spring 10. At this time, the resin spring 10 is entirely formed by a curved portion between the projecting portions 12. Therefore, the genko 5 can be easily inserted. Similarly, the genko 5 is easily escaped from the opening 3 during the sex separation. Furthermore, since the thick portion 13 is formed behind the protruding portion 12, the elastic force of the resin spring 10 is increased and the durability of the resin spring 10 is improved.

  Further, since the eight protrusions 12 are formed on the inner peripheral surface 11 of the resin spring 10, the resin spring 10 expands to the outside substantially evenly. Furthermore, it has suitable elastic force.

  Furthermore, since the taper surfaces 14a and 14b are formed at the inner front end portion of the projecting portion 12 and the outer front end portion of the curved portion between the projecting portions 12, the resin spring 10 can be inserted into and removed from the Genko 5. Have a moderate stickiness.

  Further, since the ejector pin 20 can be pushed out by pressing the resin spring 10 after completion of molding by the mold with the thick portion 13 formed on the resin spring 10, the resin spring 10 can be easily taken out from the mold. Become.

DESCRIPTION OF SYMBOLS 1 ... Hook 2 ... Female hook 3 ... Opening 4 ... Male hook 5 ... Genko 6 ... Fitting part 7 ... Constriction part 8 ... Cap part 9 ... Socket part 10 ... Resin spring 11 ... Inner peripheral surface 12 ... Protrusion part 13 ... Meat Thick portions 14a, 14b ... tapered surface 20 ... ejector pin X ... thickness direction

Claims (3)

  An annular resin spring provided in an opening of a female hook into which a male hook's genko is inserted to hold the genko in the opening, and a plurality of projecting portions projecting inward are formed on an inner peripheral surface thereof. A resin spring characterized in that it is formed at equal intervals, is curved so as to bulge outwardly between the protrusions, and a thick part is formed behind the protrusions.   The resin spring according to claim 1, wherein eight protrusions are formed on the inner peripheral surface. In the manufacturing method of the resin spring of Claim 1 or 2,
A resin characterized by comprising a step of, after completion of molding by a mold, a plurality of ejector pins provided on the mold abutting against the corresponding thick portions to push out the resin spring in the thickness direction. Spring manufacturing method.

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