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JP4203195B2 - Assist grip - Google Patents

Assist grip Download PDF

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Publication number
JP4203195B2
JP4203195B2 JP32624899A JP32624899A JP4203195B2 JP 4203195 B2 JP4203195 B2 JP 4203195B2 JP 32624899 A JP32624899 A JP 32624899A JP 32624899 A JP32624899 A JP 32624899A JP 4203195 B2 JP4203195 B2 JP 4203195B2
Authority
JP
Japan
Prior art keywords
grip
hinge
leg
cover
assist grip
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 - Lifetime
Application number
JP32624899A
Other languages
Japanese (ja)
Other versions
JP2001138792A (en
Inventor
実男 末房
武志 島田
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.)
Molten Corp
Original Assignee
Molten Corp
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 Molten Corp filed Critical Molten Corp
Priority to JP32624899A priority Critical patent/JP4203195B2/en
Publication of JP2001138792A publication Critical patent/JP2001138792A/en
Application granted granted Critical
Publication of JP4203195B2 publication Critical patent/JP4203195B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Description

【0001】
【発明の属する技術分野】
本発明は、自動車の天井、例えばルーフトリムに取りつけられ、乗員が握ることで体を支持するアシストグリップに関する。
【0002】
【従来の技術】
従来、この種アシストグリップとして、グリップ部及びその両端に設けられた脚部を有し、さらに脚部にネジを収納する凹部が形成され、この凹部を被覆するカバー部がヒンジ部を介して脚部と一体形成された構造が知られている(例えば特開平9−66764号公報)。かかる構造において、ヒンジ部が開放された状態で凹部にネジが収容され、グリップと車体とを螺着した後、カバー部を回動して凹部を塞ぐのである。カバー部及び凹部周辺には係合部が形成されており、この係合部にて、カバー部は凹部を被覆した状態で固定される。
【0003】
【発明が解決しようとする課題】
上記構造のアシストグリップは、カバー部を開いた状態で車体に取りつけられるため、その作業中、カバー部に作業者の手等体の一部がぶつかり、ヒンジ部にヒンジ折り曲げ方向と直交する方向(横方向)から力が加わることが多く、かかる力によりヒンジ部が破断するおそれがある。とくにカバー部は、一方向に長い長方形とされ、その短辺にヒンジ部を形成した構造とされるから、ヒンジ部に横方向の力が加わりやすいのである。かかる問題に対処すべく、ヒンジ部の肉厚をやや厚くして破断しにくい構造とすることも考えられるが、かかる構造とすると、ヒンジ部が曲げにくくなること、かつ硬く折れやすくなるという新たな問題が発生する。
【0004】
本発明は、かかる事情に鑑みてなされたもので、曲げやすくかつ破断しにくいヒンジ部を有するアシストグリップを提供するものである。
【0005】
【課題を解決するための手段】
本発明(請求項1)は、グリップ部と、該グリップ部の両端に形成され自動車車体の天井等に取りつけられる脚部と、該脚部に形成され車体に螺着するネジが配置される凹部と、該凹部を被覆するカバー部と、該カバー部と上記脚部とを係合する係合部とを備えたアシストグリップであって、上記カバー部は、射出成形により上記脚部にヒンジ部を介して折り曲げ可能に連結され、かつ該ヒンジ部にはその両端部に補強リブが形成されてなるものである。かかる構成において、ヒンジ部に横方向の力が加わっても、補強リブにてヒンジ部の破断は抑制される。
【0006】
本発明(請求項2)にあっては、上記グリップ部、脚部、カバー部及びヒンジ部が、熱可塑性樹脂にて一体成形されてなり、かつ上記熱可塑性樹脂に、発泡材が混合されてなるものである。かかる構成において、発泡材の混合により、樹脂自体はもろくかつ折れやすいものとなるが、ヒンジ部両端の補強リブにより、両端が強化され、ヒンジ部は折れにくい状態が維持される。
【0007】
【発明の実施の形態】
図1〜3において、1は、アシストグリップで略U字状を有し、自動車車体の天井例えばルーフトリムの両側に取りつけられ、乗員が片手で握り、姿勢を維持するものである。このアシストグリップ1は、手で握るグリップ部2と、その両端の脚部3とからなり、脚部3が、ネジ(図示せず)にて車体に螺着されるのである。4は、ネジが収容される凹部で、脚部3に形成されてなり、それぞれネジ孔5を有している。6は、凹部4を被覆するカバー部で、湾曲した表面を有する略長方形に形成され、その一短辺が脚部3にヒンジ部7を介して連結されている。グリップ部2、脚部3、カバー部6及びヒンジ部7は、一体成形されている。
【0008】
8はヒンジ部7の両端に設けられた補強リブで、脚部3とカバー部6との間に形成されている。この補強リブ8は、ヒンジ部7に、その折り曲げ方向と直交する方向から外力が加わったとき、これが破断するのを抑制する作用をなす。9はカバー部6の内面において長方形部分の一方の長辺側(図中外側)に形成された係合突起、10は、脚部3側に形成された係合孔で、カバー部6を閉じたとき、係合突起9が係合孔10へ係合し、カバー部6は脚部3へ固定される。llは、カバー部6の他方の長辺側(図中内側)に形成されたガイドであり、カバー部6が凹部4に正確に納まるよう、カバー部6の位置決め作用をなす。12は、凹部4内に形成された段差で、カバー部6の閉鎖時その先端が当接し、カバー部6と脚部3の表面の高さを等しくする作用をなす。アシストグリップ1の車体への取りつけに際しては、カバー部6が開いた状態で、アシストグリップ1が、車体にネジにて固定された後、カバー部6を矢印a方向へ折り曲げて、係合突起9を係合孔10へ係合することにより、カバー部6にて凹部4が被覆される。
【0009】
アシストグリップ1は、熱可塑性樹脂、好適にはポリプロピレン樹脂を基材とし、これに発泡材を混合した材料を射出成形することにより得られる。発泡材として重曹が使用でき、その混合量は約1ないし2重量%である。発泡材には、その熱分解温度を調整、すなわち成形温度に合わせるためにクエン酸等よりなる発泡助材が微量添加されている。発泡材単独では分解温度が高く、発泡成形条件に適合しないためである。発泡材は、射出成形時の加熱により熱分解して気体を発生してキャビティ内圧力を上昇させ、成形後のヒケ発生を抑制する作用をなす。この発泡材の混合により、成形体内部に微小な気泡が多数存在する多孔質構造とすることができ、これはアシストグリップ1を軟らかくし、衝撃が加わったときこれを吸収緩和する作用をなす。
【0010】
発泡材として上記重曹のほか、アゾジカルボンアミド、N,N’−ジニトロソペンタメチレンテトラミン、4,4’−オキシビス(ベンゼンスルホニルヒドラジド)が使用できる。また発泡助材として、上記クエン酸のほか尿素化合物、亜鉛化合物等が使用できる。
【0011】
一例として、ヒンジ部7の厚さ0.5mm,幅10mmとし、その両端に直径lmmの円柱状の補強リブ8を形成した場合、カバー部6の横方向荷重強度は、2.5〜3.0kgfまで破断せず、他方同一形状で補強リブ8が存在しないヒンジ部7では、1.5〜1.8kgfで破断した。この種自動車用アシストグリップ1においては、2.0kgf以上の強度が必要とされており、上記補強リブ8を設けることにより、かかる条件を満足することができる。
【0012】
上記実施形態では、熱可塑性樹脂に発泡材を混合した場合について説明したが、成形にガスインジェクション法を用い、グリップ部を中空形状とした構造に適用することもできる。この方法は、キャビティの壁面に表皮をセットし、金型を閉じてキャビティ内に軟化状態にある樹脂を射出し、これに窒素ガスを注入して軟化した樹脂を内部から膨張させ表皮に被着させるものである。かかる場合、発泡材は不要である。
【0013】
【発明の効果】
本発明(請求項1)によれば、射出成形によりヒンジ部両端に補強リブが設けられるから、アシストグリップを車体に取りつける作業中、ヒンジ部に体の一部があたってヒンジ部が破断するという問題は殆どなくなり、したがってアシストグリップの取りつけ作業に際し、カバー部等に手が当たらないよう注意する必要がなく、作業が易となる。またヒンジ部の厚さを可能な限り薄くできるから、ヒンジ部の折り曲げに力を要することがなく、作業を楽なものとすることができる。
【0014】
本発明(請求項2)によれば、発泡材を混合することにより、樹脂材料が多少もろいものとなっても、ヒンジ部は補強リブにより、破断しにくい構造とされているから、アシストグリップ取りつけ作業に際し、ヒンジ部が裂けるおそれは殆どない。それ故、成形材料樹脂に発泡材を混合して成形時のヒケ発生を防止することができ、製品の歩留りを向上させることができる。
【図面の簡単な説明】
【図1】本発明実施の形態にかかるアシストグリップの斜視図(カバー部を開いた状態)である。
【図2】図1のII−II線断面図である。
【図3】本発明実施の形態にかかるアシストグリップの斜視図(カバー部を閉じた状態)である。
【符号の説明】
1 アシストグリップ
2 グリップ部
3 脚部
4 凹部
5 ネジ孔
6 カバー部
7 ヒンジ部
8 補強リブ
9 係合突起
10 係合孔
11 ガイド
12 段差
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an assist grip that is attached to a ceiling of an automobile, such as a roof trim, and supports a body by being gripped by an occupant.
[0002]
[Prior art]
Conventionally, this type of assist grip has a grip portion and leg portions provided at both ends of the grip portion, and a recess portion for storing a screw is formed in the leg portion, and a cover portion covering the recess portion is provided with a leg via a hinge portion. A structure integrally formed with a portion is known (for example, JP-A-9-66764). In such a structure, the screw is accommodated in the concave portion with the hinge portion opened, and after the grip and the vehicle body are screwed together, the cover portion is rotated to close the concave portion. Engaging portions are formed around the cover portion and the recessed portion, and the cover portion is fixed with the engaging portion covering the recessed portion.
[0003]
[Problems to be solved by the invention]
Since the assist grip having the above structure is attached to the vehicle body with the cover portion opened, a part of the operator's hand or the like collides with the cover portion during the work, and the hinge portion is in a direction perpendicular to the hinge folding direction ( In many cases, a force is applied from the lateral direction, and the hinge portion may be broken by the force. In particular, the cover portion has a rectangular shape that is long in one direction, and a hinge portion is formed on the short side of the cover portion, so that a lateral force is easily applied to the hinge portion. In order to cope with such a problem, it is conceivable that the thickness of the hinge part is made slightly thick to make it difficult to break, but with such a structure, the hinge part becomes difficult to bend and it becomes hard and easy to break. A problem occurs.
[0004]
This invention is made | formed in view of this situation, and provides the assist grip which has a hinge part which is easy to bend and is hard to fracture | rupture.
[0005]
[Means for Solving the Problems]
The present invention (Claim 1) includes a grip portion, leg portions formed at both ends of the grip portion and attached to a ceiling or the like of an automobile body, and a recess in which a screw formed on the leg portion and screwed to the vehicle body is disposed. And an assist grip provided with a cover portion covering the recess, and an engagement portion for engaging the cover portion with the leg portion, wherein the cover portion is hinged to the leg portion by injection molding. The hinge portion is foldably connected to the hinge portion, and reinforcing ribs are formed at both ends of the hinge portion. In such a configuration, even if a lateral force is applied to the hinge portion, breakage of the hinge portion is suppressed by the reinforcing rib.
[0006]
In the present invention (Claim 2), the grip part, the leg part, the cover part and the hinge part are integrally formed of a thermoplastic resin, and a foam material is mixed with the thermoplastic resin. It will be. In such a configuration, the resin itself becomes fragile and easily broken by mixing the foam material, but both ends are strengthened by the reinforcing ribs at both ends of the hinge part, and the hinge part is maintained in a state in which it is difficult to break.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3, reference numeral 1 denotes an assist grip having a substantially U-shape, which is attached to the ceiling of an automobile body, for example, both sides of a roof trim, and is held by an occupant with one hand. The assist grip 1 includes a grip portion 2 to be gripped by a hand and leg portions 3 at both ends thereof, and the leg portion 3 is screwed to the vehicle body with screws (not shown). Reference numeral 4 denotes a recess for accommodating a screw, which is formed in the leg portion 3 and has a screw hole 5. Reference numeral 6 denotes a cover portion that covers the recess 4 and is formed in a substantially rectangular shape having a curved surface, and one short side thereof is connected to the leg portion 3 via a hinge portion 7. The grip part 2, the leg part 3, the cover part 6, and the hinge part 7 are integrally formed.
[0008]
Reinforcing ribs 8 are provided at both ends of the hinge portion 7 and are formed between the leg portion 3 and the cover portion 6. The reinforcing rib 8 has an effect of suppressing breakage of the hinge portion 7 when an external force is applied from a direction orthogonal to the bending direction. Reference numeral 9 denotes an engagement protrusion formed on one long side (outside in the figure) of the rectangular portion on the inner surface of the cover portion 6, and 10 an engagement hole formed on the leg portion 3 side to close the cover portion 6. When this occurs, the engagement protrusion 9 engages with the engagement hole 10, and the cover portion 6 is fixed to the leg portion 3. ll is a guide formed on the other long side (inside of the drawing) of the cover portion 6, and serves to position the cover portion 6 so that the cover portion 6 can be accurately placed in the recess 4. Reference numeral 12 denotes a step formed in the recess 4, and the front end of the cover portion 6 abuts when the cover portion 6 is closed, so that the heights of the surfaces of the cover portion 6 and the leg portion 3 are equalized. When the assist grip 1 is attached to the vehicle body, the cover portion 6 is opened and the assist grip 1 is fixed to the vehicle body with screws, and then the cover portion 6 is bent in the direction of arrow a to engage the engagement protrusion 9. Is engaged with the engagement hole 10, so that the cover 4 covers the recess 4.
[0009]
The assist grip 1 is obtained by injection molding a material in which a thermoplastic resin, preferably a polypropylene resin is used as a base material, and a foam material is mixed with the base material. Baking soda can be used as the foaming material, and the mixing amount is about 1 to 2% by weight. A small amount of foaming aid made of citric acid or the like is added to the foam material in order to adjust its thermal decomposition temperature, that is, to match the molding temperature. This is because the foam material alone has a high decomposition temperature and does not conform to the foam molding conditions. The foamed material is thermally decomposed by heating at the time of injection molding to generate gas and raise the pressure in the cavity, thereby suppressing the occurrence of sink marks after molding. By mixing the foamed material, it is possible to obtain a porous structure in which a large number of minute bubbles are present inside the molded body. This softens the assist grip 1 and absorbs and relaxes it when an impact is applied.
[0010]
In addition to the above baking soda, azodicarbonamide, N, N′-dinitrosopentamethylenetetramine, and 4,4′-oxybis (benzenesulfonylhydrazide) can be used as the foaming material. In addition to the citric acid, urea compounds and zinc compounds can be used as foaming aids.
[0011]
As an example, when the hinge portion 7 has a thickness of 0.5 mm and a width of 10 mm, and cylindrical reinforcing ribs 8 having a diameter of 1 mm are formed at both ends thereof, the lateral load strength of the cover portion 6 is 2.5-3. The hinge portion 7 that did not break to 0 kgf and had the same shape and no reinforcing rib 8 was broken at 1.5 to 1.8 kgf. This kind of assist grip 1 for automobiles is required to have a strength of 2.0 kgf or more, and by providing the reinforcing rib 8, such a condition can be satisfied.
[0012]
In the above-described embodiment, the case where the foaming material is mixed with the thermoplastic resin has been described. However, the present invention can be applied to a structure in which the gas injection method is used for molding and the grip portion is hollow. In this method, the skin is set on the wall of the cavity, the mold is closed, the softened resin is injected into the cavity, and the softened resin is expanded from the inside by injecting nitrogen gas into the cavity. It is something to be made. In such a case, no foam material is required.
[0013]
【The invention's effect】
According to the present invention (Claim 1), since the reinforcing ribs are provided at both ends of the hinge part by injection molding , the hinge part breaks due to a part of the body hitting the hinge part during the work of attaching the assist grip to the vehicle body. problem is no longer the most, and therefore upon the mounting work of the assist grip, cover portion or the like does not need to be careful not to hit the hands, work becomes easy. Further, since the thickness of the hinge portion can be made as thin as possible, no force is required for bending the hinge portion, and the work can be facilitated.
[0014]
According to the present invention (Claim 2), even if the resin material becomes somewhat brittle by mixing the foam material, the hinge portion is structured to be difficult to break by the reinforcing rib, so that the assist grip is attached. During the work, there is almost no possibility that the hinge part is torn. Therefore, the foaming material can be mixed with the molding material resin to prevent the occurrence of sink marks during molding, and the yield of products can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of an assist grip according to an embodiment of the present invention (in a state where a cover portion is opened).
2 is a cross-sectional view taken along line II-II in FIG.
FIG. 3 is a perspective view of the assist grip according to the embodiment of the present invention (in a state where a cover portion is closed).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Assist grip 2 Grip part 3 Leg part 4 Recessed part 5 Screw hole 6 Cover part 7 Hinge part 8 Reinforcement rib 9 Engagement protrusion 10 Engagement hole 11 Guide 12 Step

Claims (2)

グリップ部と、該グリップ部の両端に形成され自動車車体の天井等に取りつけられる脚部と、該脚部に形成され車体に螺着するネジが配置される凹部と、該凹部を被覆するカバー部と、該カバー部と上記脚部とを係合する係合部とを備えたアシストグリップであって、上記カバー部は、射出成形により上記脚部にヒンジ部を介して折り曲げ可能に連結され、かつ該ヒンジ部にはその両端部に補強リブが形成されてなることを特徴とするアシストグリップ。A grip part; a leg part formed at both ends of the grip part and attached to a ceiling or the like of an automobile body; a recess formed in the leg part and screwed to be screwed to the car body; and a cover part covering the recess part And an engaging grip that engages the cover part and the leg part, wherein the cover part is connected to the leg part via a hinge part so as to be foldable by injection molding , An assist grip, wherein reinforcing hinges are formed at both ends of the hinge portion. 上記グリップ部、脚部、カバー部及びヒンジ部は、熱可塑性樹脂にて一体成形されてなり、かつ上記熱可塑性樹脂に発泡材が混合されてなることを特徴とする請求項1記載のアシストグリップ。  The assist grip according to claim 1, wherein the grip portion, the leg portion, the cover portion, and the hinge portion are integrally formed of a thermoplastic resin, and a foam material is mixed with the thermoplastic resin. .
JP32624899A 1999-11-17 1999-11-17 Assist grip Expired - Lifetime JP4203195B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Publication Number Publication Date
JP2001138792A JP2001138792A (en) 2001-05-22
JP4203195B2 true JP4203195B2 (en) 2008-12-24

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3674555B2 (en) * 2000-08-24 2005-07-20 豊田合成株式会社 Grip, molding method thereof and molding die
DE20310944U1 (en) * 2003-07-16 2003-12-04 Trw Automotive Electronics & Components Gmbh & Co.Kg Bearings for a vehicle grab handle and grab handle

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