JP3470742B2 - Thermal caulking structure - Google Patents

Thermal caulking structure

Info

Publication number
JP3470742B2
JP3470742B2 JP16375096A JP16375096A JP3470742B2 JP 3470742 B2 JP3470742 B2 JP 3470742B2 JP 16375096 A JP16375096 A JP 16375096A JP 16375096 A JP16375096 A JP 16375096A JP 3470742 B2 JP3470742 B2 JP 3470742B2
Authority
JP
Japan
Prior art keywords
boss
housing
fixing portion
thermal caulking
caulking structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP16375096A
Other languages
Japanese (ja)
Other versions
JPH09323360A (en
Inventor
武志 佐藤
正一 橋本
治文 横山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Kokusai Electric Inc
Original Assignee
Hitachi Kokusai Electric Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Kokusai Electric Inc filed Critical Hitachi Kokusai Electric Inc
Priority to JP16375096A priority Critical patent/JP3470742B2/en
Publication of JPH09323360A publication Critical patent/JPH09323360A/en
Application granted granted Critical
Publication of JP3470742B2 publication Critical patent/JP3470742B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/60—Riveting or staking
    • B29C65/606—Riveting or staking the rivets being integral with one of the parts to be joined, i.e. staking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
    • B29C66/474—Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially non-flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B29C66/81429—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81422—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being convex
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81423—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being concave

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

【発明の詳細な説明】 【０００１】 【発明の属する技術分野】本発明は、プラスチック部品
をプラスチック製の筐体に取付ける場合の熱カシメ構造
に関するものである。 【０００２】 【従来の技術】小型電子機器等、種々の機器の多くはプ
ラスチック製の筐体を具備しており、斯かる筐体に各種
部品を取付ける構造として熱カシメ構造が広く用いられ
ている。以下、熱カシメ構造を携帯用小型電子機器の筐
体に、プッシュ釦を熱カシメした場合について説明す
る。 【０００３】図３〜図５に於いて従来の押釦スイッチ取
付構造について説明する。 【０００４】図中１は小型電子機器の筐体の一部である
フロントケースを示し、２は押釦部材を示す。前記フロ
ントケース１には円形状の釦孔３が穿設され、該釦孔３
と所要距離はなれた位置にボス４、突起５が穿設され、
前記押釦部材２は前記ボス４に熱カシメされることによ
り前記フロントケース１の裏面に取付けられる。 【０００５】前記押釦部材２は一端部に円形状の釦部６
が設けられ、該釦部６の裏面には十字形状の突起９が形
成されている。他端には固着部７が形成され、前記釦部
６と前記固着部７を接続する中間部には蛇行した帯状の
アーム８が形成されている。前記釦部６は前記釦孔３に
出入自在に嵌合し、前記突起９は図示しない配線基板に
実装されたスイッチに当接する様になっている。前記固
着部７の中心には円形状の固着孔１０が穿設され、該固
着孔１０は前記ボス４と遊嵌可能である。 【０００６】図５で示す治具１１は前記ボス４を加熱、
加圧して熱カシメするものであり、前記治具１１の底面
に前記ボスが固化した時に、上面が僅かに湾曲する様な
凹面である加圧面１２が形成されている。 【０００７】前記釦部６を前記釦孔３より露出させ、出
入自在に嵌合しつつ、前記アーム８を前記突起５に当接
させ、前記固着孔１０を前記ボス４に嵌合する。該ボス
４の前記固着孔１０より突出した先端部１３に前記治具
１１を当てて、該治具１１を介して前記ボス４を加熱、
加圧し、該ボス４の先端部１３を潰して、図４中実線で
示す逆円錐状に熱カシメする。熱カシメ後、前記ボス４
が冷却すると、特に頭部が図４中の２点鎖線の如く収縮
する。前述した様に先端部１３は逆円錐状であるので、
収縮により図中上下方向、左右方向に前記ボス４、前記
固着部７間に隙間が生じ、熱カシメ不良を起こす虞れが
ある。斯かる熱カシメ不良を防止する方法としては、従
来熱カシメ時の加熱温度、加圧力を調整し、冷却、収縮
後も間隔が生じることのない様にしていた。 【０００８】 【発明が解決しようとする課題】然し乍ら上記した従来
の押釦スイッチ取付構造では、カシメ不良を抑制する
為、加熱温度を高く、又加圧力を大きくする必要があっ
た。ところが、ボス４が細すぎたり、或は筐体周囲の肉
厚が薄い場合、熱、圧力による影響が筐体に及び筐体表
面にプラスチック材料特有の白化現象を起こすことがあ
り、製品価値を喪失させる虞れがある等の不具合があっ
た。 【０００９】本発明は、上記実情に鑑みなしたものであ
って、熱カシメ時に筐体が白化現象を起こすことなく、
効率よく筐体と押釦部材との密着性を向上させることの
できる熱カシメ構造を提供しようとするものである。 【００１０】 【課題を解決するための手段】本発明は、プラスチック
製筐体にボスを突設し、該ボスに取付部品の固着部を嵌
合させ、前記ボスの突出部を熱変形させる熱カシメ構造
に於いて、突出部を固着部の嵌合孔より大径で偏平薄肉
のフランジ状に形成する熱カシメ構造に係り、前記筐体
のボスの周囲に放射状にリブを突設した熱カシメ構造に
係り、前記固着部の径をボスに対して嵌合可能な範囲で
最小径とする熱カシメ構造に係るものであり、必要最小
な加熱量、加圧力で熱カシメでき、リブの弾性変形によ
り、軸心方向のガタツキが抑えられ、ボスと嵌合孔とが
締り嵌めとなり半径方向のガタツキも抑えられる。 【００１１】 【発明の実施の形態】以下、本発明の実施の形態につい
て図面を参照して説明する。 【００１２】図１は図３で示す従来の押し釦スイッチ取
付構造のＡ−Ａ矢視相当図であり、図中１５はフロント
ケースを示し、１６は押釦部材を示す。該押釦部材１６
は前述した従来の押し釦部材２と同様に形成され、前記
フロントケース１５に取付けられる。 【００１３】前記押釦部材１６の一端に固着部１７が形
成され、該固着部１７は中央に円形状の固着孔１８を有
し、該固着孔１８は前記フロントケース１５に突設され
るボス１９に嵌合され、熱カシメされる。 【００１４】前記固着孔１８と前記ボス１９との隙間は
支障なく嵌合できる範囲で、できる限り小さくしてい
る。該ボス１９の周囲には、該ボス１９を中心として放
射状にリブ２０が所要数突設されている。 【００１５】治具２１は前記ボス１９を加熱、加圧して
熱カシメするものであり、加圧面２２は平らであり、前
記固着孔１８より充分大きくしている。従って、前記加
圧面２２は前述した従来の治具１１の加圧面１２より大
きくなっている。前記治具２１の底面略中央には、前記
ボス１９を加熱、加圧した場合、先端部２４が広がり易
い様に突起２３が設けられている。 【００１６】前記ボス１９に前記固着孔１８を嵌合さ
せ、前記ボス１９の前記固着孔１８より突出した先端部
２４に前記治具２１を当接させ、加熱、加圧して熱カシ
メする。 【００１７】前記ボス１９の先端部２４は前記治具２１
の形状に倣い円板状に偏平に変形され、前記先端部２４
の直径は前記固着孔１８の直径に比べて充分に大きくな
る。前記突起２３は前記ボス１９の先端部２４が加熱さ
れ軟化した場合に半径方向に容易に広がる様に設けられ
ている。又、前記治具２１の加圧面２２が大きいので、
前記先端部２４への伝熱面積が大きく、又前記先端部２
４は平坦で肉厚が薄い為、先端部２４を局部的に加熱す
ることができ、加熱量が少なくてすむ。従って、加熱温
度、加圧力を小さくできるので筐体への影響を抑制でき
る。 【００１８】前記ボス１９への加熱を少熱量、且局部的
とすることができるので、該ボス１９冷却時に、熱収縮
も局部的で且少なく抑えることができる。更に、前記ボ
ス１９は薄肉であるので肉厚方向の収縮量は少ない。 【００１９】前記した様に前記ボス１９の周囲には前記
リブ２０が突設されており、前記ボス１９を加圧する際
前記リブ２０は圧縮変形している。従って、前記ボス１
９に対する加圧力を除却すると前記リブ２０の変形が復
帰し、前記固着部１７を上方に押し上げる。従って、前
記ボス１９の板厚方向の収縮量と前記リブ２０による押
上げ量が相殺され、前記固着部１７と前記ボス１９との
軸心方向のガタツキの発生が抑止される。 【００２０】次に、図１では説明を容易にする為前記固
着部１７と前記ボス１９との間隙を大きく示している
が、実際は前述した様に、前記固着部１７と前記ボス１
９との間隙を殆どなくしている。前記固着部１７を前記
治具２１で加熱、加圧すると前記ボス１９の中間部２５
が太鼓状に膨らむ現象が生じる。従って該中間部２５の
膨らみにより前記ボス１９と前記固着部１７とは締り嵌
め状態となる。 【００２１】而して、前記固着部１７と前記ボス１９と
は軸心方向、半径方向の隙間が完全に抑制される。 【００２２】 【発明の効果】以上述べた如く本発明によれば、ボス加
熱時の熱伝導率が向上し、ボスの収縮量が減少し必要最
小な加熱量、加圧力で熱カシメでき、更にリブを設ける
ことでリブが軸心方向のガタツキを吸収し、更にボスが
加圧されて太鼓状に膨らみ、固着孔とボスとが締り嵌め
となるので、半径方向のガタツキも抑えられる等の優れ
た効果を発揮する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal caulking structure for attaching a plastic component to a plastic housing. 2. Description of the Related Art Many types of devices such as small electronic devices have a plastic housing, and a thermal caulking structure is widely used as a structure for mounting various components to such a housing. . Hereinafter, a case in which the thermal caulking structure is thermally caulked to the housing of a portable small electronic device and the push button is described. A conventional push button switch mounting structure will be described with reference to FIGS. In FIG. 1, reference numeral 1 denotes a front case which is a part of a housing of a small electronic device, and reference numeral 2 denotes a push button member. A circular button hole 3 is formed in the front case 1.
The boss 4 and the projection 5 are drilled at a position separated from the required distance by
The push button member 2 is attached to the back surface of the front case 1 by being caulked to the boss 4. The push button member 2 has a circular button portion 6 at one end.
And a cross-shaped projection 9 is formed on the back surface of the button portion 6. A fixed portion 7 is formed at the other end, and a meandering band-shaped arm 8 is formed at an intermediate portion connecting the button portion 6 and the fixed portion 7. The button portion 6 is fitted in the button hole 3 so as to be able to come and go, and the projection 9 comes into contact with a switch mounted on a wiring board (not shown). The center of the fixing portion 7 are bored fixation hole 10 of circular shape, the solid <br/> Chakuana 10 can loosely fit and the boss 4. A jig 11 shown in FIG.
A pressing surface 12 is formed on the bottom surface of the jig 11, which is a concave surface whose upper surface is slightly curved when the boss is solidified. The button portion 6 is exposed from the button hole 3 and the arm 8 is brought into contact with the projection 5 while being fitted in and out of the button hole 3, and the fixing hole 10 is fitted in the boss 4. The jig 11 is applied to the tip 13 of the boss 4 protruding from the fixing hole 10, and the boss 4 is heated via the jig 11.
The tip 13 of the boss 4 is crushed by pressurization, and heat caulked in an inverted conical shape shown by a solid line in FIG. After heat caulking, the boss 4
When cooled, the head particularly shrinks as shown by the two-dot chain line in FIG. As described above, the tip 13 has an inverted conical shape,
Due to the contraction, a gap is formed between the boss 4 and the fixing portion 7 in the up-down direction and the left-right direction in FIG. As a method for preventing such a thermal caulking failure, conventionally, a heating temperature and a pressing force at the time of thermal caulking have been adjusted so that no space is generated even after cooling and shrinking. However, in the conventional push button switch mounting structure described above, it was necessary to increase the heating temperature and the pressing force in order to suppress the crimping failure. However, if the boss 4 is too thin or the wall thickness around the housing is thin, the effect of heat and pressure may cause a whitening phenomenon peculiar to the plastic material on the housing and on the housing surface. There were problems such as the possibility of loss. The present invention has been made in view of the above circumstances, and does not cause a whitening phenomenon in a housing at the time of heat caulking.
It is an object of the present invention to provide a thermal caulking structure capable of efficiently improving the adhesion between a housing and a push button member. According to the present invention, a boss is protruded from a plastic housing, a fixing portion of a mounting component is fitted to the boss, and the protrusion of the boss is thermally deformed. In the caulking structure, the present invention relates to a heat caulking structure in which a protruding portion is formed in a flat thin-walled flange shape with a diameter larger than a fitting hole of a fixing portion, and a thermal caulking device in which ribs are projected radially around a boss of the housing. The present invention relates to a heat caulking structure in which the diameter of the fixing portion is a minimum diameter within a range in which the fixing portion can be fitted to the boss. Thereby, the backlash in the axial direction is suppressed, and the boss and the fitting hole are tightly fitted, so that the backlash in the radial direction is also suppressed. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view corresponding to the AA direction of the conventional push button switch mounting structure shown in FIG. 3, wherein reference numeral 15 denotes a front case, and 16 denotes a push button member. The push button member 16
Are formed in the same manner as the conventional push button member 2 described above, and are attached to the front case 15. A fixing portion 17 is formed at one end of the push button member 16. The fixing portion 17 has a circular fixing hole 18 at the center, and the fixing hole 18 is provided with a boss 19 protruding from the front case 15. And heat caulked. The gap between the fixing hole 18 and the boss 19 is made as small as possible within a range that can be fitted without any trouble. A required number of ribs 20 are provided around the boss 19 radially around the boss 19. The jig 21 heats and presses the boss 19 to caulk the heat, and the pressing surface 22 is flat and sufficiently larger than the fixing hole 18. Therefore, the pressing surface 22 is larger than the pressing surface 12 of the conventional jig 11 described above. At the approximate center of the bottom surface of the jig 21, a projection 23 is provided so that when the boss 19 is heated and pressed, the distal end portion 24 is easily spread. The fixing hole 18 is fitted into the boss 19, and the jig 21 is brought into contact with a tip 24 of the boss 19 protruding from the fixing hole 18, and is heated and pressurized for heat caulking. The tip 24 of the boss 19 is
The tip portion 24 is deformed flatly into a disk shape following the shape of
Is sufficiently larger than the diameter of the fixing hole 18. The projections 23 are provided so as to easily spread in the radial direction when the tip 24 of the boss 19 is heated and softened. Also, since the pressing surface 22 of the jig 21 is large,
The heat transfer area to the tip 24 is large and the tip 2
4 is flat and thin, so that the distal end portion 24 can be locally heated, and the amount of heating is small. Therefore, since the heating temperature and the pressure can be reduced, the influence on the housing can be suppressed. Since the heating of the boss 19 can be performed with a small amount of heat and locally, heat shrinkage can be locally and reduced when the boss 19 is cooled. Further, since the boss 19 is thin, the amount of shrinkage in the thickness direction is small. As described above, the rib 20 protrudes around the boss 19, and when the boss 19 is pressed, the rib 20 is compressed and deformed. Therefore, the boss 1
When the pressing force applied to the rib 9 is removed, the deformation of the rib 20 is restored, and the fixing portion 17 is pushed upward. Accordingly, the amount of shrinkage of the boss 19 in the plate thickness direction and the amount of push-up by the rib 20 cancel each other, and the occurrence of backlash in the axial direction between the fixing portion 17 and the boss 19 is suppressed. Next, in FIG. 1, the gap between the fixing portion 17 and the boss 19 is shown large for ease of explanation, but actually, as described above, the fixing portion 17 and the boss 1 are formed.
9 is almost eliminated. When the fixing portion 17 is heated and pressed by the jig 21, the intermediate portion 25 of the boss 19 is pressed.
The swelling occurs like a drum. Therefore, the boss 19 and the fixing portion 17 are tightly fitted by the bulging of the intermediate portion 25. Thus, the gap between the fixing portion 17 and the boss 19 in the axial direction and the radial direction is completely suppressed. As described above, according to the present invention, the thermal conductivity at the time of heating the boss is improved, the shrinkage amount of the boss is reduced, and the heat can be caulked with the required minimum heating amount and pressure. By providing the ribs, the ribs absorb the rattling in the axial direction, and the boss is further pressurized and swells like a drum, and the fixing hole and the boss are tightly fitted, so that the rattling in the radial direction is also suppressed. It has the effect.

【図面の簡単な説明】 【図１】本発明の実施の形態を示し、図３のＡ−Ａ矢視
相当図である。 【図２】同前実施の形態に用いる治具の断面図である。 【図３】従来例を示す斜視図である。 【図４】該従来例を示すＡ−Ａ矢視図である。 【図５】該従来例に用いる治具の断面図である。 【符号の説明】 １５ フロントケース １６ 押釦部材 １７ 固着部 １８ 固着孔 １９ ボス ２０ リブ ２１ 治具 ２２ 加圧面 ２３ 突起 ２４ 先端部 ２５ 中間部BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an embodiment of the present invention and is a view corresponding to an arrow AA in FIG. FIG. 2 is a sectional view of a jig used in the first embodiment. FIG. 3 is a perspective view showing a conventional example. FIG. 4 is a view taken along the line AA of the conventional example. FIG. 5 is a sectional view of a jig used in the conventional example. [Description of Signs] 15 Front case 16 Push button member 17 Fixing portion 18 Fixing hole 19 Boss 20 Rib 21 Jig 22 Pressing surface 23 Projection 24 Tip 25 Middle part

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平８−156101（ＪＰ，Ａ) 実開 昭63−139920（ＪＰ，Ｕ) 実開 昭63−101522（ＪＰ，Ｕ) 実開 平７−4028（ＪＰ，Ｕ) 実開 昭63−31919（ＪＰ，Ｕ) 実開 昭55−15066（ＪＰ，Ｕ) 実開 昭60−94935（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 65/00 - 65/82 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-156101 (JP, A) JP-A-63-139920 (JP, U) JP-A-63-101522 (JP, U) 4028 (JP, U) Fully open sho 63-31919 (JP, U) Fully open sho 55-15066 (JP, U) Fully open sho 60-94935 (JP, U) (58) Fields investigated (Int. 7 , DB name) B29C 65/00-65/82

Claims (1)

(57)【特許請求の範囲】 【請求項１】 プラスチック製筐体にボスを突設し、該
ボスに取付部品の固着部を嵌合させ、前記ボスの突出部
を熱変形させる熱カシメ構造に於いて、前記筐体のボス
の周囲に、該ボスを中心に放射状にリブを所要数突設
し、該リブは前記固着部に押上げる方向に当接すること
を特徴とする熱カシメ構造。(57) [Claims 1] A thermal caulking structure in which a boss is protruded from a plastic housing, a fixing portion of an attachment component is fitted to the boss, and the protruding portion of the boss is thermally deformed. in the around the boss of the housing, the ribs radially about the boss required number projected, thermal caulking structure in which the rib is characterized in that in contact with the pushed up direction to the fixing unit.
JP16375096A 1996-06-04 1996-06-04 Thermal caulking structure Expired - Fee Related JP3470742B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16375096A JP3470742B2 (en) 1996-06-04 1996-06-04 Thermal caulking structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16375096A JP3470742B2 (en) 1996-06-04 1996-06-04 Thermal caulking structure

Publications (2)

Publication Number Publication Date
JPH09323360A JPH09323360A (en) 1997-12-16
JP3470742B2 true JP3470742B2 (en) 2003-11-25

Family

ID=15779992

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16375096A Expired - Fee Related JP3470742B2 (en) 1996-06-04 1996-06-04 Thermal caulking structure

Country Status (1)

Country Link
JP (1) JP3470742B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2873321B1 (en) 2004-07-23 2008-05-09 Inergy Automotive Systems Res METHOD FOR FIXING AN ACCESSORY IN A FUEL TANK OF PLASTIC MATERIAL
WO2015162998A1 (en) * 2014-04-24 2015-10-29 帝人株式会社 Fiber-reinforced resin joined object, intermediate and fastening rod
JP6370235B2 (en) * 2015-02-03 2018-08-08 三菱電機株式会社 Weld structure

Also Published As

Publication number Publication date
JPH09323360A (en) 1997-12-16

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