JPH0737703U - Flexible caster - Google Patents

Abstract

(57)【要約】 （修正有） 【目的】 金型部品の形状を変えるだけで、耐久性、剛
性、耐摩耗性その他従来より優れた機能を発揮できる自
在キャスターを提供すること。 【構成】 ハウジング１に回転可能に枢着し、タイヤ５
を支持するステー４に、衝撃荷重がタイヤにかかったと
きハウジングに当たって衝撃を分散させる突起６を形成
したこと。又成形後金型から外す際形崩れなく離型する
傾斜面をステーに形成したこと。 (57) [Summary] (Correction) [Purpose] To provide a universal caster that can exhibit durability, rigidity, wear resistance and other superior functions by simply changing the shape of the mold parts. [Structure] The tire 5 is rotatably pivotally attached to the housing 1 and has a tire 5
Protrusions 6 are formed on the stay 4 that supports the tires to disperse the impact by hitting the housing when an impact load is applied to the tire. In addition, the stay shall be formed with an inclined surface so that it may be released from the mold after molding without losing its shape.

Description

【考案の詳細な説明】[Detailed description of the device]

【０００１】[0001]

【産業上の利用分野】[Industrial applications]

本考案は、キャスターに係り、特に衝撃荷重に対しても破壊、分解することの ない強固な自在キャスターに関するものである。 The present invention relates to a caster, and more particularly to a strong and flexible caster that does not break or disassemble even when subjected to an impact load.

【０００２】[0002]

【従来の技術】[Prior art]

図７及び図１２に示すように、アンダーカット傾斜面βを利用して、成形品５ ０を押し開き、（図９、図１０参照）離型することが行われていた。故に従来の この構造を無理抜き構造という専門語で表現されている。 As shown in FIGS. 7 and 12, the undercut inclined surface β was used to push open the molded product 50 (see FIGS. 9 and 10) and release the mold. Therefore, this conventional structure is expressed by a technical term called a structure without force.

【０００３】 無理抜き構造は、浅い傾斜面を利用する方法であるが、無理抜きと表現される ように無理が生じるため、成形品のアンダーカット部（図７ロ、図１２参照）の 形状が崩れる。即ち、離型のため、追出しプレート２２が成形品５０を押すと図 １０のようにＸ′方向に動きながらＹ′方向に開くので角度βの形状が崩れる。 そのため、前記のように、より浅く、より傾斜角度βを小さく取る必要が生じ、 組立構造上（図１２）強固な安定した物が得られず、組立完成品として度々、耐 久性、剛性、耐衝撃性に欠け、市場では面倒の原因となっている。The force-extracting structure is a method of using a shallow inclined surface, but since the force is generated as expressed as force-excluding, the shape of the undercut portion (see FIGS. 7B and 12) of the molded product is Collapse. That is, because the release plate 22 pushes the molded product 50 due to the mold release, it moves in the X ′ direction and opens in the Y ′ direction as shown in FIG. 10, so that the shape of the angle β collapses. Therefore, as described above, it becomes necessary to make the angle shallower and the inclination angle β smaller, and a solid and stable product cannot be obtained due to the assembly structure (Fig. 12). It lacks impact resistance and causes trouble in the market.

【０００４】[0004]

【考案が解決しようとする課題】[Problems to be solved by the device]

本考案の課題は、前記従来の構造による欠点を除去し、金型部品の形状を変え るだけで、耐久性、耐衝撃性等従来以上の優れた機能を発揮できるキャスターを 提供することにある。 An object of the present invention is to provide a caster capable of exhibiting superior functions such as durability and impact resistance as compared with the conventional ones by simply removing the drawbacks of the conventional structure and changing the shape of mold parts. .

【０００５】[0005]

【課題を解決するための手段】[Means for Solving the Problems]

本考案の手段は次のとおりである。 The means of the present invention are as follows.

【０００６】 （１）ハウジングに設けた支柱に、タイヤを支持するステーを回転可能に枢着 し、タイヤに衝撃荷重がかかったとき、ハウジングに当たって衝撃を分散させる 突起を前記ステーに突設した自在キャスター。(1) A stay supporting a tire is rotatably and pivotally mounted on a column provided in a housing, and when a load is applied to the tire, the stay is provided with a protrusion that disperses the impact by hitting the housing. caster.

【０００７】 （２）ハウジングに設けた支柱に、タイヤを支持するステーを回転可能に枢着 した自在キャスターにおいて、ステー成形後射出成形金型から外す際、追出しプ レートで押込むと前記ステーが拡開して形崩れなく離型可能となる傾斜面を前記 ステーの下端面に形成した構造。(2) In a universal caster in which a stay supporting a tire is rotatably pivotally attached to a column provided in a housing, when the stay is molded and then removed from the injection molding die, the stay is pushed by pushing it with an ejection plate. A structure in which an inclined surface that expands and can be released without losing its shape is formed on the lower end surface of the stay.

【０００８】 （３）ステーの内側にタイヤ支持軸が嵌まる深い軸穴を形成し、軸穴は穴中心 線に対して平行な面を穴の全周に設けた実用新案登録請求の範囲第２項記載の自 在キャスター。(3) A deep shaft hole into which the tire support shaft is fitted is formed inside the stay, and the shaft hole is provided with a plane parallel to the hole center line on the entire circumference of the hole. The self-supporting caster described in item 2.

【０００９】[0009]

【実施例】【Example】

図１乃至図６を参照して本考案に係る自在キャスターの具体例を説明する。 A specific example of the universal caster according to the present invention will be described with reference to FIGS. 1 to 6.

【００１０】 １はハウジングで支柱２を中心に吊下し、支柱２が入る挿入穴３を有するステ ー４を組付ける。ステー４にタイヤ５を支持させる。本考案においては、ステー ４の上端に突起６を一体に突設し、衝撃荷重がタイヤ５にかかったとき、ステー ４の突起６がハウジング１に当たり、撓んだ支柱２と、突起６により分散して、 タイヤ５にかかる過大荷重を受ける構造にしてある。図１１に示すタイヤ５を支 持するタイヤ支持軸１１を固定するステー４の内側の軸穴１２は穴の全周にわた り軸中心線と平行する面（図２、図１１のα）を有するために、支持軸１１をラ ジアル方向に強固に保持できると共に、スラスト方向の緩み、遊びも吸収できる 。更にステー４の下端面に傾斜面２１を形成する。この傾斜面２１を利用して追 出しプレート（図４の２２）を楔のように押し込むことで（図４〜図６）深い直 角面のアンダーカット部α形状を崩すことなく、離型可能にしたものである。か くして強いアンダーカット構造を可能にした。又ステー４の内側に設けた軸穴１ ２（図２）には前述のように穴中心線に平行な面αを穴の全周に設け、その形状 を崩すことなく離型できる。従ってその穴に組込まれたタイヤ支持軸１１の組付 位置にゆとりができ支持力も強固にすることができる。Reference numeral 1 denotes a housing, which is suspended around a column 2, and a stage 4 having an insertion hole 3 into which the column 2 is inserted is assembled. The tire 5 is supported on the stay 4. In the present invention, the protrusion 6 is integrally provided on the upper end of the stay 4, and when the impact load is applied to the tire 5, the protrusion 6 of the stay 4 hits the housing 1 and is dispersed by the bent column 2 and the protrusion 6. Then, the tire 5 is structured to receive an excessive load. The shaft hole 12 inside the stay 4 for fixing the tire support shaft 11 that supports the tire 5 shown in FIG. 11 has a surface (α in FIGS. 2 and 11) parallel to the shaft center line over the entire circumference of the hole. Since it has, the support shaft 11 can be firmly held in the radial direction, and the looseness and play in the thrust direction can be absorbed. Further, an inclined surface 21 is formed on the lower end surface of the stay 4. By using the inclined surface 21 to push the ejection plate (22 in FIG. 4) like a wedge (FIGS. 4 to 6), it is possible to release the mold without breaking the shape of the deep rectangular undercut α. It is the one. A strong undercut structure has been made possible. Further, in the shaft hole 12 (FIG. 2) provided inside the stay 4, the surface α parallel to the hole center line is provided on the entire circumference of the hole as described above, and the mold can be released without breaking the shape. Therefore, the mounting position of the tire support shaft 11 assembled in the hole can be made wider and the supporting force can be strengthened.

【００１１】[0011]

【作用】[Action]

（請求項１）通常荷重時は、タイヤ５にかかる荷重は、ステー４により支えら れ、ステー４はハウジング１に設けた支柱２に支えられる。支柱２の周りをステ ー４が旋回することで、自在性を発揮するが、時に設計値以上の過大荷重、特に 衝撃荷重がかかることがあり、その際の破損、分解が問題となる。 (Claim 1) Under normal load, the load applied to the tire 5 is supported by the stay 4, and the stay 4 is supported by the columns 2 provided in the housing 1. Although the flexibility is exhibited by the rotation of the stay 4 around the support column 2, sometimes an excessive load exceeding the design value, especially an impact load may be applied, causing damage and disassembly at that time.

【００１２】 本考案においては、過大な衝撃荷重を受けたとき、従来のように支柱２に加わ る曲げモーメントのみではなく、支柱２の撓みとステー４の突起６がハウジング １に接触し、力Ｗを挾んだ支持部、支柱２と、突起６とで、力を分散して受ける 。又衝撃時の反動で、タイヤ５が力Ｗと逆方向に強い力で跳ね返る現象が発生す るが、その力をαで示した面で受けることができる。According to the present invention, when an excessive impact load is applied, not only the bending moment applied to the supporting column 2 as in the conventional case but also the bending of the supporting column 2 and the protrusion 6 of the stay 4 contact the housing 1 and force is applied. The support part, the column 2, and the projection 6 that sandwich W are distributed and receive the force. Further, due to the recoil at the time of impact, a phenomenon occurs in which the tire 5 bounces with a strong force in the direction opposite to the force W, but the force can be received by the surface indicated by α.

【００１３】 （請求項２）追出しプレート２２と形成ステー４との接触面にγなる角度があ るため離型工程で図４〜図６のような動きとなる。即ち、成形ステー４を型から 離そうと、追出しプレート２２がステー４を押すと、その力が成形したステー４ の傾斜面２１を外側に開く力となり、図４のＸ方向に移動せず、Ｙ方向に動き、 図２のα面の抵抗がなくなった状態で、Ｘ方向に移動し、離型され図６の状態と なる。(Claim 2) Since the contact surface between the ejection plate 22 and the forming stay 4 has an angle of γ, the movement as shown in FIGS. That is, when the push-out plate 22 pushes the stay 4 to separate the molded stay 4 from the mold, the force acts to open the inclined surface 21 of the molded stay 4 to the outside and does not move in the X direction of FIG. When it moves in the Y direction and the resistance of the α surface in FIG. 2 disappears, it moves in the X direction and is released from the mold to obtain the state of FIG.

【００１４】 （請求項３）ステー内側にタイヤ支持軸が嵌まる深い軸穴を形成し、軸穴は穴 中心線に対して平行な面を穴の全周に設けてあるため、その形状を崩すことなく 離型でき、タイヤ支持軸をラジアル方向に強固に支持できる。又離型力に合った ステーの弾性撓み力を確保でき、スラスト方向の緩み、遊び４０（図１１）も吸 収でき、そして支持軸の組付位置にゆとりができ、そのため支持力も強固となる 。(Claim 3) A deep shaft hole into which the tire support shaft is fitted is formed inside the stay, and the shaft hole has a surface parallel to the center line of the hole all around the hole. It can be released without breaking and can firmly support the tire support shaft in the radial direction. In addition, the elastic bending force of the stay that matches the releasing force can be secured, the looseness in the thrust direction, the play 40 (Fig. 11) can be absorbed, and the mounting position of the support shaft can be relaxed, so that the support force is also strong. .

【００１５】[0015]

【効果】【effect】

本考案によれば、従来のキャスターよりも一層大きな荷重、衝撃に耐え、コン パクト化でき、材料費、取付操作、収納スペース等を考慮すれば、経済効果は大 きい。 According to the present invention, it is possible to withstand a larger load and shock than the conventional casters and to be compact, and the economic effect is great in consideration of the material cost, the mounting operation, the storage space and the like.

【提出日】平成６年１月１１日[Submission date] January 11, 1994

【手続補正１】[Procedure Amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】００１３[Correction target item name] 0013

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【００１３】 （請求項２）追出しプレート２２と成形ステー４との接触面にγなる角度がある ため離型工程で図４〜図６のような動きとなる。即ち、成形ステー４を型から離 そうと、追出しプレート２２がステー４を押すと、その力が成形したステー４の 傾斜面２１を外側に開く力となり、図４のＸ方向に移動せず、Ｙ方向に動き、図 ２のα面の抵抗がなくなった状態で、Ｘ方向に移動し、離型され図６の状態とな る。(Claim 2) Since the contact surface between the ejection plate 22 and the forming stay 4 has an angle of γ, the movement as shown in FIGS. That is, when the push-out plate 22 pushes the stay 4 to separate the molded stay 4 from the mold, the force acts to open the inclined surface 21 of the molded stay 4 to the outside, and does not move in the X direction in FIG. It moves in the Y direction, and when there is no resistance on the α plane in FIG.

【図面の簡単な説明】[Brief description of drawings]

【図１】組立て断面図。FIG. 1 is an assembled sectional view.

【図２】ステーの縦断正面図。FIG. 2 is a vertical sectional front view of a stay.

【図３】同上の縦断側面図。FIG. 3 is a vertical sectional side view of the above.

【図４】型開き前の断面図。FIG. 4 is a sectional view before mold opening.

【図５】離型工程初期の断面図。FIG. 5 is a cross-sectional view in the early stage of a mold release process.

【図６】離型する工程の終了前の状態を示す断面図。FIG. 6 is a cross-sectional view showing a state before the end of the releasing step.

【図７】従来のステーの縦断正面図。FIG. 7 is a vertical sectional front view of a conventional stay.

【図８】同上の縦断側面図。FIG. 8 is a vertical sectional side view of the above.

【図９】従来品の型開き前の断面図。FIG. 9 is a cross-sectional view of a conventional product before mold opening.

【図１０】同上の離型工程の初期状態を示す断面図。FIG. 10 is a cross-sectional view showing an initial state of the releasing process in the above.

【図１１】本考案のステーにタイヤ支持軸を組付けた状
態を示す断面図。FIG. 11 is a cross-sectional view showing a state where a tire support shaft is assembled to the stay of the present invention.

【図１２】従来のステーにタイヤ支持軸を組付けた断面
図。FIG. 12 is a cross-sectional view in which a tire support shaft is attached to a conventional stay.

【図１３】キャスター取付部の形状、寸法の変化の一例
を示す断面図。FIG. 13 is a cross-sectional view showing an example of changes in the shape and dimensions of the caster mounting portion.

【図１４】キャスター取付部の形状、寸法の変化の一例
を示す断面図。FIG. 14 is a cross-sectional view showing an example of changes in the shape and dimensions of the caster mounting portion.

【符号の説明】[Explanation of symbols]

１ ハウジング ２ 支柱 ３ 挿入穴 ４ ステー ５ タイヤ ６ 突起 １１ タイヤ支持軸 １２ 軸穴 ２１ 傾斜面 1 Housing 2 Support 3 Insertion Hole 4 Stay 5 Tire 6 Projection 11 Tire Support Shaft 12 Shaft Hole 21 Slope

Claims (3)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項１】 ハウジングに設けた支柱に、タイヤを支
持するステーを回転可能に枢着し、タイヤに衝撃荷重が
かかったとき、ハウジングに当たって衝撃を分散させる
突起を前記ステーに突設した自在キャスター。1. A free caster in which a stay for supporting a tire is rotatably pivotally mounted on a column provided in a housing, and a projection is provided on the stay so as to disperse the impact by hitting the housing when an impact load is applied to the tire. . 【請求項２】 ハウジングに設けた支柱に、タイヤを支
持するステーを回転可能に枢着した自在キャスターにお
いて、ステー成形後射出成形金型から外す際、追出しプ
レートで押込むと前記ステーが拡開して形崩れなく離型
可能となる傾斜面を前記ステーの下端面に形成した構
造。2. In a universal caster in which a stay supporting a tire is rotatably pivotally mounted on a column provided in a housing, the stay expands when pushed out by an ejection plate when the stay is removed from the injection mold after molding. A structure in which an inclined surface that can be released without deforming is formed on the lower end surface of the stay. 【請求項３】 ステーの内側にタイヤ支持軸が嵌まる深
い軸穴を形成し、軸穴は穴中心線に対して平行な面を穴
の全周に設けた実用新案登録請求の範囲第２項記載の自
在キャスター。3. A utility model registration claim in which a deep shaft hole into which the tire support shaft is fitted is formed inside the stay, and the shaft hole has a plane parallel to the center line of the hole all around the hole. Flexible caster as described in item.