JP2010169244A - Anchoring implement and shaped article member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anchoring implement capable of responding even if a boss hole provided in a thinly and lightweight designed shaped article member is formed as a through-hole. <P>SOLUTION: The anchoring implement 1 is provided with a plug body 3 having an end face (a) in a tip of a short columnar body 2, a first small diameter part 4, a large diameter part 5 having knurling (uneven strips) on an outer circumference face of the body, a second small diameter part 6, and a bottom (a flange part) 7 having an end face b. Chamfering is carried out along the end face (a) of the plug body 3, and a side contacting the first small diameter part 4 of the large diameter 5 is chamfered also. A female screw hole 8 piercing the end face b from the end face (a) is provided in the body 2. The boss formed of the shaped article member is provided with a hole to be a guide of inserting the anchoring implement 1 and a through-hole for fitting in the anchoring implement 1. The through-hole is formed with an outer diameter larger than the plug body 3 and a hole diameter smaller a predetermined value than an outer diameter of the large diameter part 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fixing member and a molded product member suitable for use by being fitted and fixed to a molded product member of a synthetic resin used for a housing of a mobile phone or the like, for example.

Conventionally, when a screw hole is formed in a member made of a synthetic resin molded product and a bolt is screwed in and fixed, it receives a tensile, torsional, vibration or other external force, or when it is attached or detached while reversing the bolt etc. Will be deformed or destroyed and become unusable.
Therefore, there is a nut-like metal fixing tool that can be securely fixed by inserting and fixing into a hole provided in a molded product member such as a synthetic resin, and can withstand repetitive attachment and detachment. It has been put into practical use. Furthermore, there has been proposed a method of providing a knurled or other irregularity on the outer peripheral surface of the fixing tool so that such a fixing tool bites into the hole of the molded product member and is fixed with sufficient strength (for example, Patent Documents). 1, 2).

Such a fixing tool is provided with a plug (also referred to as a plug, hereinafter referred to as a plug) in the distal end side. When the fixing tool is fitted into the molded product member, the fixing tool is guided (guided) by the plug body into the hole of the boss provided in the molded product member, and the fixing tool is fitted by being heated and pressurized. ing.
In recent years, for example, in a case of a mobile phone or the like, there is an increasing demand for a design in which a molded product member is lightened and thinned so as to be described as “light thin and short”. When the molded product member itself is made thin in order to meet such demand, the boss hole must be made shallower. For example, the height of the boss of the molded product member used for the casing of the mobile phone is 1. There is a thing of about 7 mm, and since it was too low, there was a problem that the depth of the boss hole could not be secured sufficiently.

  Therefore, in such a case, it can be considered that the boss hole is a through hole. In this case, when the fixing tool is inserted by heating and pressurizing, the resin around the hole protrudes from the through hole or is scraped off. There is a problem that it may cause problems such as a short circuit when it comes out and hinders the attachment of the decorative plate, or when the molded product member is metal-plated.

  Japanese Patent Laid-Open No. 50-85756   JP 58-124809 A

As described above, when the molded product member is thinned and the boss hole is made into a through-hole to heat and pressurize the fastener to meet the design demands to make the molded product lighter and thinner However, there is a problem that the peripheral resin of the hole protrudes from the through hole, scrapes come out and hinders the mounting of the decorative plate, or a short circuit may occur if the molded product member is metal-plated. It was.
An object of the present invention is to provide a fixing tool and a molded product member that can cope with a boss hole provided in a molded product member that is designed to be light and thin.

Accordingly, the present invention is a fixing tool fixed to a through hole provided in a synthetic resin molded product member, and is provided to protrude from the tip of a cylindrical body, and has an outer diameter smaller than the diameter of the through hole. A plug body, a first small-diameter portion having an outer diameter smaller than the outer diameter of the plug body, provided on the outer peripheral surface of the columnar main body adjacent to the plug body, and the first small-diameter portion A large-diameter portion that is adjacently provided on the outer peripheral surface of the cylindrical main body, has a large number of irregularities larger than the outer diameter of the plug, and the first small-diameter portion side is chamfered by a predetermined value; Adjacent to the large diameter portion, provided on the outer peripheral surface of the cylindrical main body, and adjacent to the second small diameter portion, a second small diameter portion having an outer diameter smaller than the outer diameter of the large diameter portion. Provided at the rear end on the outer peripheral surface of the cylindrical body, and having a bottom portion having an outer diameter larger than the outer diameter of the large diameter portion A.
Further, the present invention is a fastener and a molded product member fixed to a through hole provided in a synthetic resin molded product member, wherein the fixed tool is provided to protrude from a tip of a cylindrical body, A plug body having an outer diameter smaller than the hole diameter of the through-hole, and a first small-diameter portion having an outer diameter smaller than the outer diameter of the plug body provided on the outer peripheral surface of the cylindrical body adjacent to the plug body And adjacent to the first small-diameter portion, provided on the outer peripheral surface of the columnar main body, and having a large number of irregularities larger than the outer diameter of the plug, and the first small-diameter portion side having a predetermined value A chamfered large-diameter portion, a second small-diameter portion having an outer diameter smaller than the outer diameter of the large-diameter portion, provided on the outer peripheral surface of the cylindrical body adjacent to the large-diameter portion, Adjacent to the second small-diameter portion, provided at the rear end on the outer peripheral surface of the cylindrical main body, the outer diameter is larger than the outer diameter of the large-diameter portion. And the molded product member has a hole diameter larger than the outer diameter of the bottom portion before the fixing tool is inserted, and a hole into which a part of the bottom portion and the second small diameter portion are fitted, In a subsequent stage, the plug body, the first small-diameter portion, the large-diameter portion, and a part of the second small-diameter portion having a hole diameter that is larger than the outer diameter of the plug body and smaller than the outer diameter of the large-diameter portion by a predetermined value. And a through-hole into which is inserted.

  The fixing tool of the present invention is a fixing tool that can cope with defects such as resin on the peripheral surface of the hole, shaving, and circuit short even if the boss hole provided in the lightly and thinly designed molded member is a through hole. It becomes possible to provide a molded article member.

1 is a half sectional view showing an example of a fixing tool to which an embodiment of the present invention is applicable. Sectional drawing which shows the shape of a molded article member. The figure which shows the state before a fixing tool is engage | inserted by the through-hole of a molded article member. The figure which shows the state by which the fixing tool was inserted by the through-hole of the molded article member.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a half sectional view showing a fixing tool 1 called an insert according to the present invention. That is, the fixing tool 1 has a plug 3 having an end surface a at the tip of a short columnar body 2, a first small diameter portion 4, and a knurl (protrusion) protruding on the outer peripheral surface of the body. A large-diameter portion 5, a second small-diameter portion 6, and a bottom portion (flange) 7 are provided with an end face b. Further, chamfering is performed along the end surface a of the plug body 3, and the large diameter portion 5 is also chamfered on the side in contact with the first small diameter portion 4. The chamfering amount and the chamfering angle of the large diameter portion 5 are particularly important. As will be described in detail later, the peripheral surface resin of the through hole to be scraped when the large diameter portion 5 is fitted into the through hole of the boss is arranged on the second small diameter portion side. It has an effect to escape. The chamfering amount and the chamfering angle of the large diameter portion 5 are determined to be predetermined values depending on the material of the molded product member.
The main body 2 is provided with a female screw hole 8 penetrating from the end surface a to the end surface b.

The fixing tool 1 of this embodiment is cut in units of 1/100 mm, and both the outer diameter of the large diameter portion and the first and second small diameter portions are changed depending on the material of the molded product member.
For example, the dimensions of the fastener 1 are 1.60 mm in total length (end surface a to end surface b), the outer diameter of the plug 3 is 2.30 mm, the outer diameter of the first small diameter portion 4 is 2.00 mm, and the large diameter portion. The outer diameter 5 is 2.80 mm, the outer diameter of the second small diameter portion 6 is 2.20 mm, and the outer diameter of the bottom portion 7 is 3.00 mm.

  The knurled shape of the large diameter portion 5 can be changed according to the material of the molded product member to be fitted. Although the fixing tool 1 uses brass in the present embodiment, a relatively hard metal such as carbon steel, stainless steel, aluminum, or zinc may be used.

  FIG. 2 is a cross-sectional view showing a configuration example of the boss 10 formed on a molded product member formed of synthetic resin. The boss 10 formed on the molded product member is provided with a hole 11 serving as a guide for inserting the fixing tool 1 and a through hole 12 into which the fixing tool 1 is fitted. The hole 11 is formed to have a larger hole diameter than the outer diameter of the bottom portion 7 (the maximum outer diameter of the fixing tool 1), and the through hole 12 is formed to have a larger outer diameter than the plug body 3 and smaller than the outer diameter of the large diameter portion 5 by a predetermined value. Has been. For example, the boss 10 of the molded product member has a total length of 1.70 mm, the hole 11 has a hole diameter of 3.20 mm, a depth of 0.50 mm, and the through hole 12 has a hole diameter of 2.40 mm. Since the total length of the boss 10 is 1.70 mm and the total length of the fixing tool 1 is 1.60 mm, it is not a dimensional difference in which the plug body 3 protrudes from the through hole 12 when the fixing tool 1 is fitted.

  Next, the operation | movement which fits the fixing tool 1 in the hole 11 and the through-hole 12 of the boss | hub 10 of a molded article member in such a structure is demonstrated. In this fitting operation, the fixing tool 1 is pressurized while being heated and is fitted into the through hole 12 of the boss 10 of the molded product member.

First, the fastener 1 is supplied (inserted) into the hole 11 and the through hole 12 of the boss 10 of the molded product member.
FIG. 3 shows the state of being supplied to the hole 11 and the through hole 12 of the boss 10 of the molded product member. The plug 3 of the fixing tool 1 enters the through-hole 12, and the large-diameter portion 5 is in a state in which insertion is stopped at the entrance of the through-hole 12 having a smaller diameter than the outer diameter of the large-diameter portion 5 in the hole 11. ing.
Thereby, the position of the fixing tool 1 is determined as a pre-stage of heating and pressurization which is the main process of the fitting operation.

  FIG. 4 shows a state in which the fixing tool 1 is fitted into the hole 11 and the through hole 12 of the boss 10 of the molded product member. That is, the fixing tool 1 in the state shown in FIG. 3 is heated and pressurized from above (on the drawing), and the synthetic resin around the through hole 12 in contact with the large diameter portion 5 of the fixing tool 1 is softened and melted. The large diameter portion 5 is allowed to enter, and the end surface b of the bottom portion 7 reaches the insertion port end surface of the boss 10 of the molded product member and is stopped.

  At this time, the peripheral surface resin of the through-hole 12 in contact with the large diameter portion 5 of the heated fixture 1 is softened and melted, and one of the peripheral surface resins is pushed out to the first small diameter portion 4 on the entry side, and the other is the first one. 2 is extruded into the small-diameter portion 6. At this time, most of the peripheral surface resin of the through hole 12 is pushed out by the chamfering of the large diameter portion 5 on the side in contact with the first small diameter portion 4 to the second small diameter portion 6 on the rear side in the insertion direction. The first small diameter portion 4 has a relatively small amount. Thus, the peripheral surface resin of the through hole 12 wraps the main body 2 around the large diameter portion 5. The softened and melted peripheral surface resin of the through-hole 12 is cooled and hardened in a state where the knurled recess of the large-diameter portion 5, the first small-diameter portion 4, and the second small-diameter portion 6 are filled. 11 and the through hole 12.

The softened and melted peripheral resin of the through-hole 12 is dammed by the plug 3 when being pushed out to the first small-diameter portion 4 although the amount is relatively small as described above. The peripheral surface resin is not melted or scraped off.
Further, metal plating (for example, nickel plating) may be applied to increase the overall strength of the molded product member. Even in such a case, the peripheral resin softened and melted from the through-hole 12 does not melt or scrape, so that there is no problem such as a circuit short circuit.

  The heating temperature of the fixing tool 1 varies depending on the outer diameter and shape (torette, etc.) of the large-diameter portion 5 of the fixing tool 1 and the material of the molded product member (boss 10). For example, the material of the molded product member is 220 ± 10 ° C. for ABS resin, 270 ± 10 ° C. for polycarbonate, and 260 ± 10 ° C. for ABS resin and polycarbonate.

  As described above, according to the embodiment of the present invention, even if the boss hole provided in the lightly designed molded product member is a through-hole, it copes with problems such as the molten resin sticking out, scraping, and circuit short-circuiting. It is possible to provide a fastener and a molded article member that can be used.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. In addition, the embodiments may be combined as appropriate as possible, and in that case, the combined effect can be obtained. Furthermore, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be obtained as an invention.

  DESCRIPTION OF SYMBOLS 1 ... Fixing tool, 2 ... Main body, 3 ... Plug body, 4 ... 1st small diameter part, 5 ... Large diameter part, 6 ... 2nd small diameter part, 7 ... Bottom part (flange part), 8 ... Female screw, 10 ... Boss (molded product member), 11... Hole, 12.

Claims (2)

A fixing tool fixed to a through-hole provided in a synthetic resin molded product member,
Protruding at the tip of the cylindrical body, a plug body having an outer diameter smaller than the diameter of the through hole,
A first small-diameter portion having an outer diameter smaller than the outer diameter of the plug body, provided on the outer peripheral surface of the cylindrical body adjacent to the plug body;
Adjacent to the first small-diameter portion is provided on the outer peripheral surface of the cylindrical main body, has a large number of irregularities larger than the outer diameter of the plug body, and the first small-diameter portion side has a predetermined value chamfering process. A large diameter portion,
A second small-diameter portion having an outer diameter smaller than the outer diameter of the large-diameter portion provided on the outer peripheral surface of the cylindrical main body adjacent to the large-diameter portion;
A bottom portion having an outer diameter larger than the outer diameter of the large-diameter portion, provided at the rear end on the outer peripheral surface of the cylindrical body adjacent to the second small-diameter portion;
The fixing tool characterized by comprising. A fastener and a molded product member fixed to a through-hole provided in a synthetic resin molded product member,
The fixing tool is provided so as to protrude from the tip of the columnar body, and is provided on the outer peripheral surface of the columnar body adjacent to the plug body having an outer diameter smaller than the diameter of the through hole. A first small-diameter portion having an outer diameter smaller than the outer diameter of the plug body, and provided on the outer peripheral surface of the cylindrical main body adjacent to the first small-diameter section, the outer diameter of the plug body A large-diameter portion having a larger number of concavo-convex ridges and chamfered on the first small-diameter portion side by a predetermined value, and provided on the outer peripheral surface of the cylindrical main body adjacent to the large-diameter portion, A second small-diameter portion having an outer diameter smaller than the outer diameter of the large-diameter portion, and a rear end on the outer peripheral surface of the cylindrical main body adjacent to the second small-diameter portion; A bottom portion having an outer diameter larger than the outer diameter,
The molded product member has a hole diameter larger than the outer diameter of the bottom portion before the fixing tool is inserted, and a hole into which a part of the bottom portion and the second small diameter portion is fitted, and an outer portion of the plug body at the rear stage. A through-hole into which the plug, the first small-diameter portion, the large-diameter portion, and a part of the second small-diameter portion are fitted with a hole diameter larger than the outer diameter of the large-diameter portion by a predetermined value. A fixing tool and a molded product member characterized by having.

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