JP4044595B1

JP4044595B1 - Swivel brake

Info

Publication number: JP4044595B1
Application number: JP2006284723A
Authority: JP
Inventors: 耕一岡本; 暢子岡本; 耕太郎岡本; 真理子岡本
Original assignee: 耕一岡本; 暢子岡本; 耕太郎岡本; 真理子岡本
Priority date: 2006-10-19
Filing date: 2006-10-19
Publication date: 2008-02-06
Anticipated expiration: 2026-10-19
Also published as: JP2008100607A

Abstract

【課題】手押し車の自在輪にとりつけられる取手から手を離すと効くブレーキを提供する。
【解決手段】ブレーキシューを車輪に押し付けるのではなく、車輪の回転がブレーキシューの回転に伝わり制動力を大きく成長させる手法で、ブレーキを押さえる力が要らないだけでなくブレーキシューの磨耗が少ないことを特長とする。ブレーキシューが環状のベアリングケースの内側の円錐状の空間を車輪外周に沿って移動し、台座下面と車輪との間で車輪の正転にはレバーとなって逆転にはクサビとなって車輪の回転を止める。
【選択図】図２Disclosed is a brake that works when a hand is released from a handle attached to a free wheel of a handcart.
[Solution] Rather than pressing the brake shoe against the wheel, the rotation of the wheel is transmitted to the rotation of the brake shoe to greatly increase the braking force. Features. The brake shoe moves along the outer periphery of the wheel in the conical space inside the annular bearing case, and it becomes a lever for the normal rotation of the wheel between the bottom surface of the pedestal and the wheel and a wedge for the reverse rotation. Stop rotation.
[Selection] Figure 2

Description

自在輪のブレーキに関する。 It relates to the brake of a universal wheel.

ブレーキシューを車輪に押し付けるのではなく、車輪の回転がブレーキシューの回転に伝わり、ブレーキシューの回転によって制動力を大きく成長させる手法で、ブレーキを押さえる力が要らない手法は、すでに特許文献１請求項１０と図１９において、吊り下げられたブレーキが車輪に接触し車輪の回転と共に当たり、更には回転をロックする突起が車輪に食い込み、車輪の回転をロックする手法が公開されている。 Instead of pressing the brake shoe against the wheel, the rotation of the wheel is transmitted to the rotation of the brake shoe and the braking force is greatly increased by the rotation of the brake shoe. In item 10 and FIG. 19, a method is disclosed in which the suspended brake contacts the wheel and hits with the rotation of the wheel, and further, a protrusion that locks the rotation bites into the wheel and locks the rotation of the wheel.

また上記の回転するブレーキシューを取手によって上下に動かし、車輪から引き離したり接触させたりする機構は、特許文献２請求項８と図１２において公開され、取手から手を離すとカートを動かない状態にするブレーキに利用されている。ブレーキシューの回転と共に制動力が増すためには、車輪とブレーキシューの回転軸が固定される必要があり、特許文献３請求項６と図１８において、これについての解決方法が発明された。回転するブレーキシューが折れ曲がるアームに取り付きアームが折れ曲がり、ブレーキシューを車輪から離しアームが一直線のとき、車輪に接触させる手法である。 Further, a mechanism for moving the rotating brake shoe up and down by a handle so that the brake shoe is pulled away from or brought into contact with the wheel is disclosed in claims 8 and 12 of Patent Document 2, and when the hand is released from the handle, the cart is not moved. Used for braking. In order to increase the braking force with the rotation of the brake shoe, it is necessary to fix the rotating shaft of the wheel and the brake shoe. In Patent Document 3, claim 6 and FIG. 18, a solution for this has been invented. This is a method in which the rotating brake shoe is bent and the arm is bent, the brake shoe is separated from the wheel, and the arm is in contact with the wheel when the arm is in a straight line.

更に特許文献４請求項２と図１０において発明されたように、回転体を取り付けるアームが動かないようにするのではなく、ブレーキシューの回転によってアームを動かない位置に移動させるようにして、ブレーキシューの回転軸の位置を固定する装置を省略した。 Further, as invented in claim 2 and FIG. 10 of Patent Document 4, the brake is made not to move the arm to which the rotating body is attached, but to move to an unmovable position by rotation of the brake shoe. The device for fixing the position of the rotating shaft of the shoe is omitted.

以上に回転しながら制動力を増すブレーキシューを、固定輪だけではなく自在輪にも取り付けた例として、特許文献３図１９に紹介された。これは車輪枠にこのブレーキを取り付けるもので、ブレーキ自体が大きな円を描いて動くため、ブレーキを入り切りする装置はこの円外の円周全体としている。ブレーキ装置を車輪枠に取り付けた場合、装置は車輪と共に回転するが、ブレーキ装置が車体に取り付きブレーキシューが単に上下するだけの構造が、特許文献５に考案されている。
特開２００４−１８２２１７特開２００６−１９３１３５特願２００６−１７２７３３特願２００６−２７７１０８実案第３０６８７３５号 As an example in which the brake shoe that increases the braking force while rotating as described above is attached not only to the fixed wheel but also to the free wheel, it was introduced in Patent Document 3 in FIG. This is to attach this brake to the wheel frame. Since the brake itself moves in a large circle, the device for turning on and off the brake is the entire circumference outside this circle. When the brake device is attached to the wheel frame, the device rotates with the wheel, but a structure in which the brake device is attached to the vehicle body and the brake shoe simply moves up and down is devised in Patent Document 5.
JP 2004-182217 A JP 2006-193135 A Japanese Patent Application No. 2006-172733 Japanese Patent Application No. 2006-277108 Model No. 3068735

旋回する車輪に、ブレーキシューが車輪の向く方向に関係なく車輪に接触する機会を得るには、特許文献５のブレーキシューのように、車輪の旋回軸に対して直角な円盤であり、車輪との接触面を線から面にするためには、円盤外周を球面の一部にする必要がある。 In order to obtain an opportunity for the brake shoe to come into contact with the wheel regardless of the direction in which the wheel faces, a disc perpendicular to the wheel's turning axis is used, as in the brake shoe of Patent Document 5, In order to change the contact surface from line to surface, it is necessary to make the outer periphery of the disk part of the spherical surface.

特許文献５は、旋回軸が軸芯である取り付けボルトの貫通穴内を上下する円棒の先に、ブレーキシューが取り付き、ブレーキシューを車輪が押さえることで回転を止めるもので、円棒が上下するだけで円棒が旋回軸から外れて動き回るものではない。円棒と貫通穴の間に間隔があり、両者にガタツキがあると、車輪の回転じにブレーキをかけるとき、円棒に軸に直角な方向の力が加わり、円棒が貫通穴の中で変形し、円棒と貫通穴との間に摩擦が生じ、円棒の上下の動きが悪くなり、ブレーキシューの上下の動きも悪くなる。 In Patent Document 5, a brake shoe is attached to the tip of a circular bar that moves up and down in a through-hole of a mounting bolt whose pivot axis is an axis, and the rotation is stopped by a wheel pressing the brake shoe. It is not just that the rod moves off the pivot axis. If there is a gap between the rod and the through-hole and there is rattling between them, a force perpendicular to the axis is applied to the rod when the wheel is braked. Deformation causes friction between the circular rod and the through hole, and the vertical movement of the circular rod is deteriorated, and the vertical movement of the brake shoe is also deteriorated.

特許文献１〜４のブレーキシューが動き回る手法を自在輪に応用するには、特許文献５の円盤が車輪枠内を自由に動き回り、その動きの終点が車輪の回転を止めるに至るようにする必要がある。ブレーキシューの上下の動きを車輪枠の外から操作するとき、特許文献５のように、円棒の上下の動きを貫通穴の中に限定し軸に直角な方向の動きを拘束するのではなく、また特許文献４のように吊り下げたブレーキシューの振り子運動を車輪を含む平面内に限るのではなく、ブレーキシューを吊り下げる円棒の上端の水平面内の動きだけを拘束し、中心を回転中心にして全方向に振り子運動できる空間を確保する円錐状の貫通穴が必要となる。 In order to apply the technique of moving the brake shoes of Patent Documents 1 to 4 to a free wheel, it is necessary that the disk of Patent Document 5 freely moves around the wheel frame and the end point of the movement stops the rotation of the wheel. There is. When operating the vertical movement of the brake shoe from the outside of the wheel frame, as in Patent Document 5, the vertical movement of the rod is not limited to the through hole and the movement perpendicular to the axis is not constrained. Also, as in Patent Document 4, the pendulum movement of the suspended brake shoe is not limited to the plane including the wheels, but only the movement in the horizontal plane at the upper end of the rod that suspends the brake shoe is constrained, and the center rotates. A conical through hole is required to secure a space where the pendulum can move in all directions around the center.

自在輪においては旋回軸が車輪の中心を通らないので、旋回軸に沿ってあけられた空間からブレーキシューを吊り下げた場合、ブレーキシューの回転中心と車輪の回転中心を結ぶ直線が、鉛直線ではないので車輪の回転方向によって異なる課題が生じる。旋回軸のあとに車輪が続く場合の車輪の回転を正転とし、車輪のあとに旋回軸が続く場合の車輪の回転を逆転とするとき、車輪の回転の接線方向の動きがなく単に車輪を上から押さえつける特許文献５のような手法では、車輪を上から押さえつける力の方向が車輪の回転軸に向かわないので、車輪の正転時にはブレーキシューが車輪の外に排斥されるようになって、ブレーキの効きが悪く、車輪の逆転時にはブレーキシューが車輪のなかに引き込まれるようになって、ブレーキの効きがよいと言うような違いがあった。車輪の正転時と逆転時のブレーキは別々に解決手段が必要となる。 In a free wheel, the turning axis does not pass through the center of the wheel, so when the brake shoe is suspended from a space along the turning axis, a straight line connecting the rotation center of the brake shoe and the rotation center of the wheel is a vertical line. However, different problems arise depending on the rotation direction of the wheel. When the rotation of the wheel when the wheel follows the swivel axis is forward rotation, and when the rotation of the wheel when the rotation axis follows the wheel is reverse rotation, there is no tangential movement of the wheel rotation and the wheel is simply moved. In the method such as Patent Document 5 for pressing from above, the direction of the force for pressing the wheel from above does not go to the rotating shaft of the wheel, so that the brake shoe is discharged out of the wheel when the wheel rotates forward, The brakes were not effective, and the brake shoes were pulled into the wheels when the wheels were rotated in reverse. A separate solution is required for braking when the wheels are rotating forward and reverse.

ブレーキシューの上下の動きを車輪枠の外から操作するため、車輪枠内のブレーキシューと枠外の鋼球とそれらをつなぐ円棒が一体となったブレーキを通すための、取り付け座から車輪にいたる貫通穴が必要である。台座を中心に車輪枠が回転する自在輪の旋回をつかさどる部分の環状のベアリングケースは、その内側には円錐状の空間があって、台座にヒンジによって取り付けられるプレートを上下に回転させることにより、車輪枠内部のブレーキシューを車輪に接触させたり離したりして自在輪の回転を止めることができる。またプレートの中央には大きな円形の穴があり、その穴の上に乗せた鋼球から下面に球面の一部を持つブレーキシューを吊り下げて、鋼球とブレーキシューとそれらを連結する円棒からなるブレーキが、鋼球の中心を回転中心にして自由に振り子運動できる空間を円錐状の貫通穴内部に確保することができる。 In order to control the vertical movement of the brake shoe from the outside of the wheel frame, the brake shoe in the wheel frame, the steel ball outside the frame and the brake that connects them are passed through from the mounting seat to the wheel A through hole is required. The annular bearing case that controls the swiveling of the free wheel whose wheel frame rotates around the pedestal has a conical space inside, and by rotating the plate attached to the pedestal by the hinge up and down, The rotation of the free wheel can be stopped by bringing the brake shoe inside the wheel frame into contact with or separating from the wheel. In addition, there is a large circular hole in the center of the plate, and a brake shoe with a part of a spherical surface on the lower surface is suspended from a steel ball placed on the hole, and the steel ball, brake shoe, and a circular rod that connects them. Thus, a space in which the brake made of can freely move the pendulum around the center of the steel ball can be secured inside the conical through hole.

ブレーキシューが車輪の外周に接触した後、車輪の回転によりブレーキシューが下側球面を常に車輪外周に接触させながら、円錐状の空間の内部を自由に振り子運動に近い運動をして移動する。車輪の正転時にブレーキシューが車輪より外方向に遠ざかる運動をするとき、移動の終点においてブレーキシューの上側平面の円周が台座下面に当たり、台座下面に当たった場所を中心にブレーキシューが回転し、ブレーキシューの台座下面に当たった端部の反対側が、テコの原理で車輪を押さえて車輪の回転を止めるようにする。車輪の逆転時にブレーキシューが車輪より内方向に入り込む運動をするとき、ブレーキシューの片側が台座下面と車輪との間に入り込みクサビとなって働き、車輪の回転がブレーキシューを巻き込み、ブレーキシューが車輪を押さえて車輪の回転を止めるようになる。このようにして車輪の正転時と逆転時のブレーキの効きの違いを、別々に解決する自在輪のブレーキを提供する。 After the brake shoe comes into contact with the outer periphery of the wheel, the brake shoe moves freely in the conical space by a movement close to the pendulum motion while the lower spherical surface is always in contact with the outer periphery of the wheel by the rotation of the wheel. When the brake shoe moves away from the wheel during normal rotation of the wheel, the circumference of the upper plane of the brake shoe hits the pedestal bottom surface at the end of movement, and the brake shoe rotates around the place where it hits the pedestal bottom surface. The opposite side of the edge that hits the bottom surface of the pedestal of the brake shoe is to use the lever principle to hold the wheel and stop the wheel from rotating. When the brake shoe moves inward from the wheel when the wheel reverses, one side of the brake shoe enters between the lower surface of the pedestal and the wheel and acts as a wedge, the rotation of the wheel entrains the brake shoe, Hold the wheel to stop the rotation of the wheel. In this way, a free-wheel brake is provided that separately solves the difference in braking effectiveness between forward and reverse rotation of the wheel.

一般に使用されている手押し車には駐車時に車輪にブレーキをかける必要があり、不特定多数の人が使う手押し車には取手から手を離すと効くブレーキがとりつけられる。この手押し車は一箇所に集める際１台ずつ運ぶのではなく、１まとまりにして１度に運ぼうとするため、手押し車は背後から別の手押し車が差し込めるような構造になっている。 A wheelbarrow that is generally used needs to brake the wheel when parked, and a wheelbarrow that is used by an unspecified number of people can be fitted with a brake that works when released from the handle. The wheelbarrows are designed not to carry one by one when collecting them in one place, but to carry them one at a time, so the wheelbarrow is structured so that another wheelbarrow can be inserted from behind.

手押し車の全車輪が自在輪である場合、１まとまりにしたとき手を離すと効くブレーキを解除すれば自由に方向を変えることができるが、前後輪のどちらかが固定輪であるとき、固定輪を接地させたままでは自由に方向を変えることができない。前輪が固定輪であるとき後から差し込む前輪が前の手押し車に乗り上げるようにし、後輪が固定輪であるとき後から差し込む手押し車で前の手押し車の後輪を持ち上げるようにしなければない。前の手押し車に後の手押し車を押し込む場合も抜き取る場合も、前輪が固定輪で後から差し込む前輪が前の手押し車に乗り上げるほうが、力が要らない。 When all the wheels of the wheelbarrow are freewheels, the direction can be changed freely by releasing the brake that is effective when the hand is released as a unit, but when either of the front and rear wheels is a fixed wheel, it is fixed. The direction cannot be changed freely while the wheel is grounded. When the front wheel is a fixed wheel, the front wheel inserted from the rear must ride on the front wheelbarrow, and when the rear wheel is a fixed wheel, the rear wheel of the front wheelbarrow must be lifted by the wheelbarrow inserted later. Whether the rear wheelbarrow is pushed into the front wheelbarrow or the wheelbarrow is pulled out, it is not necessary for the front wheel to be inserted from the rear with the front wheel on the front wheelbarrow.

手を離すと効くブレーキは取手から遠い固定輪に取り付けやすく、取手に近い自在輪に取り付けにくい。本発明によって手を離すと効くブレーキが自在輪に簡単に取り付けられるようになると、後輪が手を離すと効くブレーキを取り付けやすい固定輪にする必要はなく、前の手押し車から後の手押し車を出し入れしやすくなる。またエスカレータに乗り入れることの出来る手押し車では、前輪が固定輪のほうがエスカレータから脱出時に終点のエンドプレートにつまずきにくく、前輪を固定輪に後輪を自在輪にすることが出来る。 The brake, which works when released, is easy to attach to a fixed wheel far from the handle, and difficult to attach to a free wheel close to the handle. According to the present invention, when the brake that works when released from the hand can be easily attached to the free wheel, it is not necessary to use a fixed wheel that is easy to attach the brake that works when the rear wheel is released, from the front wheelbarrow to the rear wheelbarrow. It becomes easy to put in and out. In addition, in a wheelbarrow that can enter an escalator, the front wheel of the fixed wheel is less likely to trip on the end plate at the end point when it escapes from the escalator, and the front wheel can be a fixed wheel and the rear wheel can be a free wheel.

図１は特許文献４図１０に示したブレーキを自在輪に取り付けたもので、１は半円回転体で、２の車輪と同一平面内にある円盤である。その回転の中心Ｐ１は円盤外周の円弧の中心より外れた位置にあり、回転中心Ｐ１から円弧までの距離は弦に近づく程長くなる。車輪２の外周のタイヤ部はゴムなどの弾性体であり、半円回転体が鋼鉄製でタイヤ部が弾性体でないとき、半円回転体は弾性体になる。 FIG. 1 is a diagram in which the brake shown in FIG. 10 of Patent Document 4 is attached to a free wheel. Reference numeral 1 denotes a semicircular rotating body, which is a disk in the same plane as two wheels. The center of rotation P1 is at a position deviating from the center of the arc on the outer periphery of the disk, and the distance from the center of rotation P1 to the arc becomes longer as it approaches the string. The tire portion on the outer periphery of the wheel 2 is an elastic body such as rubber. When the semicircular rotating body is made of steel and the tire portion is not an elastic body, the semicircular rotating body is an elastic body.

３は車輪枠で、接続軸Ｐ３にアーム７が取り付き、アーム７に半円回転体が取り付く。Ａは環状のベアリングケース部分で、太く塗りつぶして表した部分は台座部４で、中央に大きな筒状の貫通穴Ｂがあく。ベアリングケースの内側は台座４の延長部分で、動かない円筒である。この台座の円筒部分４の回りは車輪枠３の延長部分で、車輪枠３の延長部はベアリングを介して台座４に取り付き、台座の円筒部分４の中心軸を中心にして車輪枠３が回転する。 Reference numeral 3 denotes a wheel frame, and an arm 7 is attached to the connection shaft P <b> 3, and a semicircular rotating body is attached to the arm 7. A is an annular bearing case part, and the thickly painted part is a base part 4 with a large cylindrical through hole B in the center. The inside of the bearing case is an extension of the base 4 and is a cylinder that does not move. Around the cylindrical portion 4 of the pedestal is an extension portion of the wheel frame 3, and the extension portion of the wheel frame 3 is attached to the pedestal 4 via a bearing, and the wheel frame 3 rotates around the central axis of the cylindrical portion 4 of the pedestal. To do.

プレート５は中央に円形穴Ｃがあき、台座４と接続軸Ｐ５にヒンジで取り付けられる。ヒンジにはねじりバネが仕込まれ、プレート５を下に回転させる方向に力が働く。円形穴Ｃは鋼球６が通り抜けない程度の大きさで、鋼球６とアーム７をつなぐ円棒８の外径より十分に大きい。鋼球６は半球でもよく円棒８に取り付けられるが、円棒８とアーム７の接続軸Ｐ６は回転可能でもなくてもよい。接続軸Ｐ６が回転可能ならば、常に円形穴Ｃの全面が鋼球６と接触するが、固定ならば接触は一部だけになる。レバー９は台座４に取り付く回転軸Ｐ４を中心にして回転し、取手９aの反対側の端部９ｂはプレート５の下面を滑走し、プレート５を上方向に引き上げたり降したりする。プレート５の下面には半円形の突起５aがあって端部９ｂが勝手に戻らないようにする。 The plate 5 has a circular hole C in the center, and is attached to the pedestal 4 and the connecting shaft P5 by a hinge. The hinge is loaded with a torsion spring, and a force acts in the direction of rotating the plate 5 downward. The circular hole C is large enough to prevent the steel ball 6 from passing through, and is sufficiently larger than the outer diameter of the rod 8 connecting the steel ball 6 and the arm 7. The steel ball 6 may be a hemisphere or attached to the circular rod 8, but the connecting shaft P6 of the circular rod 8 and the arm 7 may not be rotatable. If the connecting shaft P6 is rotatable, the entire surface of the circular hole C is always in contact with the steel ball 6, but if it is fixed, the contact is only a part. Lever 9 rotates about the rotation axis P4 which attaches to the base 4, the end portion 9b opposite the handle 9a is sliding lower surface of the plate 5, or drop-off or pull the plate 5 upward. The lower surface of the plate 5 has a semicircular protrusion 5a so that the end 9b does not return freely.

図１（ａ）は走行状態でプレート５を上方向に引き上げた状態で、端部９ｂと接続軸Ｐ９を結ぶ直線はプレート５に直行し、プレート５は静止状態を保つ。プレート５は接続軸Ｐ５を中心にｒ１方向に回転し、プレート５上に乗っている鋼球６は持ち上げられ、アーム７は接続軸Ｐ３を中心にｒ２方向に回転する。半円回転体１は上昇して、半円回転体１の上側の平面部は、ベアリングケースＡの下面Ｐ４Ｌと車輪枠３に取り付けた当たりＱ３に当たって静止する。 FIG. 1A shows a state in which the plate 5 is pulled upward in the running state, and a straight line connecting the end portion 9b and the connecting shaft P9 goes straight to the plate 5 , and the plate 5 remains stationary. The plate 5 rotates about the connection axis P5 in the r1 direction, the steel ball 6 riding on the plate 5 is lifted, and the arm 7 rotates about the connection axis P3 in the r2 direction. The semicircular rotator 1 rises, and the upper flat portion of the semicircular rotator 1 comes into contact with the lower surface P4L of the bearing case A and the contact Q3 attached to the wheel frame 3, and stops.

走行時には車輪２、車輪枠３、アーム７、半円回転体１、円棒８、及び鋼球６が一体となって旋回軸ＹＹを中心に旋回するが、ベアリングケースを介して連続する台座４及びプレート５は静止している。旋回する鋼球６と円棒８が旋回軸ＹＹを中心に回転し、旋回軸ＹＹが円形穴の中心を通るように設計すると、旋回時に鋼球６が円形穴Ｃの円内で回転し、静止する部分が旋回する部分の運動を妨げることはない。 During traveling, the wheel 2, the wheel frame 3, the arm 7, the semicircular rotating body 1, the circular rod 8, and the steel ball 6 are integrally turned around the turning axis YY, but the pedestal 4 continuous through the bearing case. And the plate 5 is stationary. If the steel ball 6 and the circular rod 8 that rotate are rotated around the rotation axis YY and the rotation axis YY passes through the center of the circular hole, the steel ball 6 rotates in the circle of the circular hole C during the rotation. The stationary part does not interfere with the movement of the turning part.

図１（ｂ）は駐車時にレバー９を起こすと、プレート５はＰ５を中心にｒ１ｂ方向に回転し、鋼球６と半円回転体１が落下する。駐車時に車体が動くと車輪が回転するが、半円回転体１は車輪２の外周上に乗って接触しているだけで車輪２の回転ｒ２が伝わり、回転軸Ｐ１を中心にｒ３方向に回転する。半円回転体１の上面の平面部分が、車輪枠３に取り付けた当たりＱ３に当たると、その接触点Ｑ３を中心に半円回転体はｒ４方向に回転し、円棒８を引っ張り、鋼球６がプレート６に当たって回転ｒ４を止める。それと同時に半円回転体１の接触点Ｑ３に当たった側と反対側が、テコの原理でタイヤ部分を押さえて車輪の回転を止める。 In FIG. 1B, when the lever 9 is raised at the time of parking, the plate 5 rotates in the r1b direction around P5, and the steel ball 6 and the semicircular rotating body 1 fall. The wheel rotates when the vehicle moves when parked, but the semicircular rotating body 1 is only on the outer periphery of the wheel 2 and is in contact with the rotation r2 of the wheel 2, and rotates in the r3 direction about the rotation axis P1. To do. When the flat portion of the upper surface of the semicircular rotating body 1 hits Q3 that is attached to the wheel frame 3, the semicircular rotating body rotates in the r4 direction around the contact point Q3, pulls the circular rod 8, and the steel ball 6 Hits the plate 6 and stops the rotation r4. At the same time, the side opposite to the contact point Q3 of the semicircular rotating body 1 presses the tire portion by the lever principle to stop the rotation of the wheel.

図１（ｃ）は車輪が図１（ｂ）と反対方向ｒ２ｂに回転すると、半円回転体１はｒ３ｂ方向に回転し、ベアリングケースＡの下面Ｐ４Ｌに当たる。図２（ｂ）と同様に、その接触点を中心に半円回転体が回転し、接触点に当たった側と反対側が、タイヤ部分を押さえて車輪の回転を止める。 In FIG. 1C, when the wheel rotates in the direction r2b opposite to that in FIG. 1B, the semicircular rotating body 1 rotates in the r3b direction and hits the lower surface P4L of the bearing case A. Similar to FIG. 2 (b), the semicircular rotating body rotates around the contact point, and the side opposite to the side hitting the contact point presses the tire portion to stop the rotation of the wheel.

図１に示したブレーキにおいて回転軸Ｐ１に吊り下げられた半円回転体１は、その回転中心を円の中心からずらした位置にすることによって、半円回転体の回転中心を通る鉛直線上ＹＹにおいて回転中心から車輪外周までの距離が最小となり、その点から左右のどちらの方向においても、回転中心と車輪外周間の距離の増加率が同じようにしているが、車輪に半円回転体が初めて接触したとき、接触しているだけで車輪の回転が伝わりやすくするには回転中心を円の中心にするほうがよく、最終的に半円回転体の回転中心が円弧の終点の接触点に移って半円回転体が回転し、接触点に当たった側と反対側がテコの原理でタイヤ部分を押さえて車輪の回転を止めるのであるから、その際半円回転体の回転中心の位置は関係がなくなる。 The semicircular rotating body 1 suspended from the rotation axis P1 in the brake shown in FIG. 1 is arranged on the vertical line YY passing through the rotational center of the semicircular rotating body by shifting its rotational center from the center of the circle. The distance from the center of rotation to the outer periphery of the wheel is minimum, and the increase rate of the distance between the center of rotation and the outer periphery of the wheel is the same in both directions from that point. In order to make it easier to transmit the rotation of the wheel when it comes into contact for the first time, it is better to set the center of rotation to the center of the circle. The semicircular rotating body rotates, and the side opposite the contact point presses the tire part on the lever principle to stop the rotation of the wheel. Disappear.

特許文献４図１０に示したブレーキのようにすると、半円回転体１が車輪外周に初めて接触した時点で、その接点は半円回転体の回転軸と車輪の回転軸とを結ぶ直線Y1上にあり、旋回軸ＹＹの鉛直線上にはないので、半円回転体の回転中心と車輪との接点との間の距離Ｌは最小ではない。半円回転体がｒ３、ｒ３ｂのどちらの方向に回転しても、回転中心と接点間の距離Ｌの増加率が同じになるようにするには、さらに半円回転体の回転中心を車輪の回転軸側に寄せる必要がある。このようなことから回転中心は円の中心にするほうがよい。 Patent Document 4 When the brake shown in FIG. 10 is used, when the semicircular rotating body 1 first contacts the outer periphery of the wheel, the contact point is on a straight line Y1 connecting the rotating shaft of the semicircular rotating body and the rotating shaft of the wheel. Therefore, the distance L between the center of rotation of the semicircular rotating body and the contact point of the wheel is not minimum. In order to make the rate of increase of the distance L between the rotation center and the contact point the same regardless of whether the semicircular rotator rotates in either direction r3 or r3b, the rotation center of the semicircular rotator is It is necessary to approach the rotating shaft side. For this reason, the center of rotation should be the center of the circle.

図１（ｂ）において半円回転体の回転ｒ３を止める当たりが台座の下面Ｐ４Ｒではなく車輪枠に取り付けた当たりＱ３にする意味は、半円回転体の車輪との接触から当たりに当たるまでの回転量を同じにするためで、当たりＱ３にではなく台座の下面Ｐ４Ｒに当てるようにしても、半円回転体の接触点に当たった側と反対側がタイヤ部分を押さえて、車輪の回転を止めるならば問題はない。 In FIG. 1B, the meaning of stopping the rotation r3 of the semicircular rotating body is Q3 which is a hitting position attached to the wheel frame instead of the lower surface P4R of the pedestal is the rotation from the contact with the wheel of the semicircular rotating body to the hitting. In order to make the amount the same, even if it hits the lower surface P4R of the pedestal instead of hitting Q3, if the side opposite to the contact point of the semicircular rotating body presses the tire part and stops the rotation of the wheel There is no problem.

半円回転体の当たりに当たる接触点Ｑ３と車輪の回転軸Ｐ２とを結ぶ直線Ｙ２と、接触点Ｑ３と車輪との接触点とを結ぶ直線Ｙ３とがなす角度Ｚが大きいほど、半円回転体とタイヤとの間にすべりが生じてタイヤ部分を押さえずに車輪の回転を止めなくなり、角度Ｚが小さいほど車輪との接触点が接触点Ｑ３と車輪の回転軸Ｐ２とを結ぶ直線Ｙ２を通り抜けやすくなる。接触点Ｑ３を回転中心にする半円回転体の回転ｒ４において、回転中心Ｑ３と車輪との接触点との間の距離は増加し、車輪との接触点が接触点Ｑ３と車輪の回転軸Ｐ２とを結ぶ直線Ｙ２を通り抜けることなく、タイヤ部分をより強く押さえて車輪の回転を止める。 The larger the angle Z formed by the straight line Y2 connecting the contact point Q3 that hits the semicircular rotating body and the rotation axis P2 of the wheel and the straight line Y3 connecting the contact point Q3 and the contact point of the wheel, the larger the semicircular rotating body. Slipping between the tire and the tire prevents the wheel from rotating without pressing the tire portion. The smaller the angle Z, the more the contact point with the wheel passes through the straight line Y2 connecting the contact point Q3 and the wheel rotation axis P2. It becomes easy. In the rotation r4 of the semicircular rotating body with the contact point Q3 as the rotation center, the distance between the rotation center Q3 and the contact point with the wheel increases, and the contact point with the wheel becomes the contact point Q3 and the rotation axis P2 of the wheel. Without passing through the straight line Y2 connecting the wheel, the tire part is pressed harder to stop the rotation of the wheel.

図２は本発明を説明するもので、図１のようにブレーキシュー１が車輪枠３に取りつき、車輪枠と一緒に旋回するのではない。図２においてブレーキシュー１は貫通穴Ｂを貫通する円棒８によって吊り下げられ、プレート５を介して台座４に取り付く。円棒８は両端に鋼球６と半球のブレーキシュー１が取り付き、鋼球６、円棒８、半球１は一体でブレーキ６、８、１を構成する。鋼球６はプレート５の上に載る。ブレーキ６、８、１は車輪枠３と分離され、その中心軸は旋回軸ＹＹ付近にある。 FIG. 2 illustrates the present invention, and the brake shoe 1 is not attached to the wheel frame 3 and turns together with the wheel frame as shown in FIG. In FIG. 2, the brake shoe 1 is suspended by a circular bar 8 penetrating the through hole B, and is attached to the base 4 via the plate 5. A circular ball 8 has a steel ball 6 and a hemispherical brake shoe 1 attached to both ends, and the steel ball 6, the circular rod 8, and the hemispherical 1 constitute the brakes 6, 8, and 1 together. The steel ball 6 is placed on the plate 5. The brakes 6, 8, and 1 are separated from the wheel frame 3, and the central axis thereof is in the vicinity of the turning axis YY.

プレート５は台座４と接続軸Ｐ５にヒンジで取り付けられ、取手の動きと連動して接続軸Ｐ５を中心に上下に回転する。取手を押して手押し車を走行させるとき、プレート５は上に引き上げられ、駐車時に取手から手を離すとプレート５は下に下がる。プレート５は中央に円形穴Ｃがあき、円形穴Ｃの上に鋼球６がのる。円形穴Ｃは鋼球６が通り抜けない程度の大きさで、円棒８の外径より十分に大きい。ブレーキシュー１を吊り下げる鋼球６は半球でもよく、下半分が円形穴Ｃに接して自由に回転する。 The plate 5 is attached to the pedestal 4 and the connection shaft P5 with a hinge, and rotates up and down around the connection shaft P5 in conjunction with the movement of the handle. When the wheelbarrow is driven by pushing the handle, the plate 5 is pulled up, and when the hand is released from the handle during parking, the plate 5 is lowered. The plate 5 has a circular hole C in the center, and a steel ball 6 is placed on the circular hole C. The circular hole C is large enough to prevent the steel ball 6 from passing through, and is sufficiently larger than the outer diameter of the rod 8. The steel ball 6 that suspends the brake shoe 1 may be a hemisphere, and the lower half is in contact with the circular hole C and freely rotates.

自在輪の構造は図１と同じで、２，３，４，５，６、Ａ，Ｂ，Ｃの各部も図１と同じである。Ａは環状のベアリングケース部分で、太く塗りつぶして表した部分は台座４で、中央に大きな貫通穴Ｂがあいている。この貫通穴は上部の入り口より下部の出口が大きく、貫通穴周囲の台座４は円錐の一部である。貫通穴Ｂの空間を円錐形にするのは、ブレーキ６、８、１が鋼球６の中心を回転中心にして振り子運動をするためである。また貫通穴の下部の出口より半球１の上側平面部分のほうが大きい。環状のベアリングケースＡは内側が台座４の延長部分で車体に固定され動かない部分で、外側は車輪枠３の延長部分である。内側と外側の間にはベアリングが介在し、内側の台座４の延長部分の周りを、外側の車輪枠３の延長部分が回転する。 The structure of the universal ring is the same as that in FIG. 1, and the parts 2, 3, 4, 5, 6, A, B, and C are also the same as those in FIG. A is an annular bearing case part, the part shown thickly is the base 4 and has a large through hole B in the center. This through hole has a larger lower outlet than the upper entrance, and the base 4 around the through hole is a part of a cone. The reason why the space of the through hole B is conical is that the brakes 6, 8, 1 perform a pendulum motion around the center of the steel ball 6. Moreover, the upper plane part of the hemisphere 1 is larger than the exit of the lower part of a through-hole. The annular bearing case A is an extended portion of the base 4 that is fixed to the vehicle body and does not move, and the outer side is an extended portion of the wheel frame 3. A bearing is interposed between the inner side and the outer side, and the extended portion of the outer wheel frame 3 rotates around the extended portion of the inner base 4.

図１の場合、ブレーキシューは円盤の半分で、図２の場合、車輪とブレーキシューとの接触が車輪の旋回に関係なく一定になるように、ブレーキシューは球体の一部である。ブレーキシューはその中心軸を旋回軸ＹＹの付近にして、宙吊り状態で静止している。 In the case of FIG. 1, the brake shoe is half of the disk, and in the case of FIG. 2, the brake shoe is a part of a sphere so that the contact between the wheel and the brake shoe is constant regardless of the turning of the wheel. The brake shoe is stationary in a suspended state with its central axis in the vicinity of the turning axis YY.

図２（ａ）に示すように円棒の周りには円筒形の螺旋状の押しバネ９があり、その端部の片側は台座４に取り付け、他方は半球１の上側平面に取り付ける。押しバネ９はプレート５が下に回転してブレーキシュー１が車輪のタイヤ部の上に乗るとき、ブレーキシュー１が車輪のタイヤ部を僅かに押さえて、車輪の回転を滑ることなくブレーキシュー１に伝える。押しバネ９で軽く押さえるのは、車輪の回転がブレーキ６，８，１に伝わり易くするためであって、車輪を押さえつけて制動しようとするものではない。 As shown in FIG. 2 (a), there is a cylindrical spiral push spring 9 around the circular rod, one end of which is attached to the pedestal 4, and the other is attached to the upper plane of the hemisphere 1. When the plate 5 rotates downward and the brake shoe 1 rides on the tire portion of the wheel, the brake spring 1 slightly presses the tire portion of the wheel so that the brake shoe 1 does not slip the wheel rotation. To tell. The reason why the wheel 9 is lightly pressed by the pressing spring 9 is to make it easy for the rotation of the wheel to be transmitted to the brakes 6, 8, 1, and is not intended to press the wheel to brake.

図２（ａ）に点線で示す状態は、取手を押してプレート６が接続軸Ｐ５を中心に上方向に回転し、半球１の上側平面が台座４の下面に当たって静止した状態である。図２（ａ）に実線で示す状態は、プレート５が接続軸Ｐ５を中心に下方向に回転し、ブレーキシュー１の下側球面が車輪外周のタイヤ部に乗った状態である。図２（ｂ）（ｃ）においては押しバネ９の記入は省略する。 The state indicated by the dotted line in FIG. 2A is a state in which the handle 6 is pushed and the plate 6 rotates upward about the connection axis P <b> 5, and the upper flat surface of the hemisphere 1 hits the lower surface of the pedestal 4 and is stationary. The state indicated by the solid line in FIG. 2A is a state in which the plate 5 rotates downward about the connecting shaft P5 and the lower spherical surface of the brake shoe 1 rides on the tire portion on the outer periphery of the wheel. In FIGS. 2B and 2C, the entry of the push spring 9 is omitted.

図２（ｂ）（ｃ）はブレーキシュー１の下側球面が車輪外周のタイヤ部に乗った後、車輪２が回転した状態である。旋回軸ＹＹを中心に車輪２と車輪枠１は回転するが、台座４とプレート５とブレーキ６，８，１は回転しない。図２（ａ）（ｂ）（ｃ）は車輪を含む平面の断面図であるが、図２（ａ）（ｂ）（ｃ）において車輪の向く方向に関係なく、同じ断面図を得るには台座４とプレート５とブレーキ６，８，１は回転体でなければならない。ブレーキ６，８，１は回転体で車輪の向く方向に関係なく同じ断面を示し、常にブレーキと車輪とは同じ状態で接触することを物語っている。台座４とプレート５とは車輪の向く方向によって異なる姿図になるが、便宜上車輪と平行な状態にして図示する。 FIGS. 2B and 2C show a state in which the wheel 2 is rotated after the lower spherical surface of the brake shoe 1 gets on the tire portion on the outer periphery of the wheel. The wheel 2 and the wheel frame 1 rotate around the turning axis YY, but the pedestal 4, the plate 5, and the brakes 6, 8, 1 do not rotate. 2 (a), (b) and (c) are cross-sectional views of the plane including the wheel. In FIGS. 2 (a), (b) and (c), the same cross-sectional view is obtained regardless of the direction of the wheel. The pedestal 4, the plate 5, and the brakes 6, 8, and 1 must be rotating bodies. The brakes 6, 8, 1 are rotating bodies and show the same cross section regardless of the direction in which the wheel faces, and always indicate that the brake and the wheel are in contact with each other in the same state. The pedestal 4 and the plate 5 are different depending on the direction in which the wheel faces, but are shown in a state parallel to the wheel for convenience.

ブレーキ６，８，１は車輪の回転が伝わって鋼球６の中心を回転中心にして自由に振り子運動をするが、図２（ｂ）では半球１が外方向に遠ざかり、図２（ｃ）では内方向に入り込む。ブレーキ６，８，１は旋回軸ＹＹを中心にする回転体であり、はじめに半球１が車輪の外周に接触するときの状態は常に同じであっても、両者の接触点は常に鋼球６の中心と車輪の回転軸とを結ぶ線Ｙ１上にあって鉛直線ＹＹ上にないため、車輪の回転方向により半球１の動きが変わり制動の内容も異なってくる。 The brakes 6, 8 and 1 transmit the rotation of the wheels, and freely move the pendulum around the center of the steel ball 6. In FIG. 2 (b), the hemisphere 1 moves away from the outside, and FIG. Then go inward. The brakes 6, 8, 1 are rotating bodies centering on the turning axis YY. Even if the state when the hemisphere 1 first contacts the outer periphery of the wheel is always the same, the contact point between them is always the steel ball 6. Since it is on the line Y1 connecting the center and the rotation axis of the wheel but not on the vertical line YY, the movement of the hemisphere 1 changes depending on the rotation direction of the wheel, and the contents of braking differ.

図２（ｂ）においては半球１が車輪の外周に接触したとき、鋼球６がプレート５の上にあって振り子運動の回転中心が動かない位置にある場合、ブレーキ６，８，１は鋼球６の中心を回転中心に回転するが、鋼球６がプレート５から上に突き上げられた状態で鋼球６が動く位置にあって、プレート５に乗るに至らない位置にあるとき、半球１は車輪の外周を降りる方向に移動する。 In FIG. 2 (b), when the hemisphere 1 is in contact with the outer periphery of the wheel, when the steel ball 6 is on the plate 5 and the center of rotation of the pendulum motion does not move, the brakes 6, 8, 1 are steel. When the steel ball 6 is in a position where the steel ball 6 moves in a state where the steel ball 6 is pushed up from the plate 5 and does not reach the plate 5, the hemisphere 1 is rotated. Moves in the direction of getting off the outer periphery of the wheel.

はじめて半球１が車輪の外周に接触するときの鋼球６の中心から車輪までの距離Ｌを半径とする球体の球面が半球１の球面であるとき、ブレーキ６，８，１は鋼球６の中心を回転中心に回転するが、半球１の球面がより大きな球体の球面である場合、鋼球６はプレート５から上に突き上げられながら、半球１は車輪の外周を降りる方向に移動する。振り子運動の回転中心の鋼球６が動かない位置に固定されるならば、振り子運動が進行するに従い鋼球６の中心から接触点までの距離が増加するので、半球１はより強く車輪外周を押さえつけることになるが、実際は鋼球６がプレート５から上に突き上げられるので、車輪外周を押さえる力は発生しない。半球１が回転したり車輪の外周を移動したりする際、鋼球６は回転の中心になる必要はなく、半球１の運動を制御する必要もない。鋼球６は半球１を車輪に接触させたり引き離したりする役目はあっても、半球１の車輪に接触してからの移動に関してなんの役割も果たさない。 When the spherical surface of the sphere whose radius is the distance L from the center of the steel ball 6 to the wheel when the hemisphere 1 contacts the outer periphery of the wheel for the first time is the spherical surface of the hemisphere 1, the brakes 6, 8, 1 When the spherical surface of the hemisphere 1 is a larger spherical surface, the steel ball 6 is pushed upward from the plate 5 while the hemisphere 1 moves in the direction of descending the outer periphery of the wheel. If the steel ball 6 at the center of rotation of the pendulum movement is fixed at a position where it does not move, the distance from the center of the steel ball 6 to the contact point increases as the pendulum movement proceeds. Although the steel ball 6 is pushed up from the plate 5 in practice, no force to press the outer periphery of the wheel is generated. When the hemisphere 1 rotates or moves on the outer periphery of the wheel, the steel ball 6 does not need to be the center of rotation, and it is not necessary to control the movement of the hemisphere 1. Although the steel ball 6 has a role of bringing the hemisphere 1 into contact with or separating from the wheel, the steel ball 6 plays no role with respect to the movement of the hemisphere 1 after contacting the wheel.

半球１は車輪の外周を降りる方向に移動した後、半球１の上側平面の円周が台座下面Ｐ４Ｒに当たり、台座下面Ｐ４Ｒを中心にブレーキ６，８，１がｒ３方向に回転し、半球の反対側がテコの原理で車輪を押さえる。この際円棒８が引き込まれても半球１がプレート５に乗るに至らないほうが半球１はより強く車輪外周を押さえつけることになる。 After the hemisphere 1 moves in the direction of getting off the outer periphery of the wheel, the circumference of the upper plane of the hemisphere 1 hits the pedestal lower surface P4R, and the brakes 6, 8, 1 rotate around the pedestal lower surface P4R in the r3 direction, opposite to the hemisphere. The side presses the wheel by lever principle. At this time, the hemisphere 1 presses the outer periphery of the wheel more strongly if the hemisphere 1 does not reach the plate 5 even if the rod 8 is pulled.

図２（ｃ）において半球１は車輪の外周を上る方向に移動し、鋼球６がプレート５から上に突き上げられた状態になって、鋼球６が動かない位置に固定されることにならない。したがって鋼球６を回転の中心とする振り子運動は起こらない。ブレーキ６，８，１は鋼球６を中心とする回転ではなく、半球１の片側がベアリングケースＡの下面Ｐ４Ｌと車輪の間の間隙に入り込む平行移動をする。 In FIG. 2C, the hemisphere 1 moves in the direction of going up the outer periphery of the wheel, the steel ball 6 is pushed up from the plate 5, and the steel ball 6 is not fixed at a position where it does not move. . Therefore, the pendulum movement around the steel ball 6 does not occur. The brakes 6, 8, 1 do not rotate around the steel ball 6, but make a parallel movement in which one side of the hemisphere 1 enters the gap between the lower surface P 4 L of the bearing case A and the wheel.

半球１の片側が台座Ｐ４Ｌと車輪間に入り込むとクサビとなって働く。車輪の回転が半球１を巻き込み、半球１は車輪を押さえて車輪の回転を止める。車輪がどちらの方向に回転するとしても半球１が車輪の外周に接触した後、ブレーキシューが下側球面を常に車輪外周に接触させながら円錐の空間Ｂの内部を自由に移動し、移動の終点においてテコやクサビの効果で車輪の回転を止めることになる。本発明において、車輪の回転にともない発生する圧縮力は制動力となると同時に、巻き込んだ半球を外に吐き出そうとする復元力でもあるので、ブレーキを解除しやすい。 When one side of the hemisphere 1 enters between the pedestal P4L and the wheels, it acts as a wedge. The rotation of the wheel entrains the hemisphere 1, and the hemisphere 1 holds the wheel and stops the rotation of the wheel. No matter which direction the wheel rotates, after the hemisphere 1 comes into contact with the outer periphery of the wheel, the brake shoe moves freely inside the conical space B with the lower spherical surface always in contact with the outer periphery of the wheel. In this case, the rotation of the wheel is stopped by the effect of lever and wedge. In the present invention, the compression force generated with the rotation of the wheel becomes a braking force, and at the same time, it is also a restoring force for discharging the caught hemisphere to the outside, so that the brake is easily released.

また回転する車輪にブレーキをかけるとき、通常のブレーキシューのように回転体に動かない摩擦部をつける手法では、接触してから回転を止めるまでにすべりが生じて摩擦部の磨耗の原因となるが、車輪の回転に摩擦部が巻き込まれる手法では一緒に回転するので、両者の間にすべりがなく従って摩擦部の磨耗は少ない。 In addition, when applying brakes to rotating wheels, the method of attaching a frictional part that does not move to the rotating body, such as a normal brake shoe, causes slippage from contact until the rotation stops, causing frictional part wear. However, in the method in which the friction part is involved in the rotation of the wheel, they rotate together, so there is no slip between them, and therefore the friction part is less worn.

図３は図２と同様の構造のブレーキで、ブレーキシューの形と機能の関係を説明するものである。図３（ａ）に点線の円弧で示すブレーキは図２のブレーキシューで、半球の下部の球面を示す。ブレーキシューと車輪との接触点Ｐ１を通る水平面よりブレーキシューの下の部分は、車軸に接触することがないので、実線で示すブレーキシューはこの部分を削除した。このブレーキシューは円盤１ａに２つの長さの異なる短い円筒１ｂ１，１ｂ２を取り付けたもので帽子の形をしている。 FIG. 3 is a brake having the same structure as that in FIG. 2 and illustrates the relationship between the shape and function of the brake shoe. The brake indicated by the dotted arc in FIG. 3A is the brake shoe of FIG. 2 and shows the lower spherical surface of the hemisphere. Since the portion below the brake shoe from the horizontal plane passing through the contact point P1 between the brake shoe and the wheel does not contact the axle, the brake shoe indicated by the solid line is deleted. This brake shoe has a disk shape with a hat 1 formed by attaching two short cylinders 1b1 and 1b2 having different lengths to a disk 1a.

内側の円筒１ｂ１は外形が小さく高さが高く、外側の円筒１ｂ２は内側の円筒に比べて外形が大きく高さが低い。内側の円筒は図３（ｃ）において、ブレーキシューがクサビとなって働くとき車輪に食い込み、外側の円筒が図３（ｂ）においてブレーキシューがテコの作用で働くとき、車輪を押さえて車輪の回転を止める。 The inner cylinder 1b1 has a small outer shape and a high height, and the outer cylinder 1b2 has a larger outer shape and a lower height than the inner cylinder. In FIG. 3C, the inner cylinder bites into the wheel when the brake shoe acts as a wedge, and the outer cylinder presses the wheel when the brake shoe works in FIG. Stop rotation.

円棒８の両端にブレーキシュー１と鋼球６が取り付き、鋼球６はブレーキシュー１を車輪から引き離す際に、プレート５によって持ち上げられるが、ブレーキシューが車輪の上に乗ったとき、プレート５から上に突き上げられた状態になる。図３（ｂ）においてブレーキシューが車輪の外周に沿って移動した後、ブレーキ６，８，１が台座４の下面Ｐ４Ｒを中心に回転するが、鋼球６を中心にする振り子運動において、円盤１ａが車輪に接触したとき、内側の円筒の切り口が車輪から離れるので、また外径の大きな円盤１ａの外周が車輪外周に接するより内部の円筒の切り口が接する方が、両者の接点Ｐ１がブレーキシューの回転中心と車輪の回転軸を結ぶ直線Ｙ２に近くなり、正動力が発生しやすいので、鋼球６を中心にする振り子運動を避けて、台座４の下面Ｐ４Ｒを中心とする回転を優先させる。 The brake shoe 1 and the steel ball 6 are attached to both ends of the rod 8, and the steel ball 6 is lifted by the plate 5 when the brake shoe 1 is pulled away from the wheel, but when the brake shoe gets on the wheel, the plate 5 It will be in the state pushed up from. In FIG. 3B, after the brake shoe moves along the outer periphery of the wheel, the brakes 6, 8, 1 rotate around the lower surface P4R of the pedestal 4, but in the pendulum motion around the steel ball 6, the disc When 1a contacts the wheel, the inner cylindrical cut end is separated from the wheel, and the contact of the inner cylindrical cut end is more effective when the outer periphery of the disk 1a having a larger outer diameter is in contact with the outer periphery of the wheel. Since it is close to the straight line Y2 that connects the rotation center of the shoe and the rotation axis of the wheel, positive power is likely to be generated, so avoiding the pendulum movement around the steel ball 6 and prioritizing the rotation around the lower surface P4R of the base 4 Let

図３（ｂ）においてブレーキシューが接触点Ｐ４Ｒを中心に回転するとき、内側の円筒１ｂ２と車輪２との接触点は、接触点Ｐ４Ｒと車輪の回転軸Ｐ２とを結ぶ直線Ｙ２を越えていて車輪を押さえる力が減少傾向にあるが、外側の円筒１ｂ１の車輪２との接触点は直線Ｙ２を越えていないので、車輪を押さえる力が増加傾向にある。直線Ｙ２を越えないように円盤１ａが車輪に当たってブレーキシューの回転を止める。 In FIG. 3B, when the brake shoe rotates around the contact point P4R, the contact point between the inner cylinder 1b2 and the wheel 2 exceeds the straight line Y2 connecting the contact point P4R and the wheel rotation axis P2. Although the force that presses the wheel tends to decrease, the contact point of the outer cylinder 1b1 with the wheel 2 does not exceed the straight line Y2, so the force that presses the wheel tends to increase. The disc 1a hits the wheel so as not to exceed the straight line Y2, and stops the rotation of the brake shoe.

また図３（ｂ）において鋼球６はプレート５の円形穴Ｃに乗って円棒８に引張力が働くようになるが、ブレーキシュー１が通り抜けて車輪枠３の外部に飛び出さないようにしている。図３（ｃ）において鋼球６はプレート５から上に突き上げられた状態で、円棒８の側面がプレート５の円形穴Ｃに当たってブレーキ６，８，１に回転を加える。 In FIG. 3B, the steel ball 6 rides on the circular hole C of the plate 5 so that a tensile force is applied to the rod 8, but the brake shoe 1 does not pass through and jump out of the wheel frame 3. ing. In FIG. 3C, the steel ball 6 is pushed up from the plate 5, and the side surface of the circular rod 8 hits the circular hole C of the plate 5 to rotate the brakes 6, 8, 1.

図４は前輪に固定輪が後輪に自在輪が取り付く手押し車で、図４（ａ）は側面図で前の手押し車を実線で、後からさしこむ手押し車を点線で示す。図４（ｂ）は背面図で図４（ｃ）は平面図である。荷台１０は外側のフレーム１０aと内側にフレームの１０ｂからなり、横架材１０ｃは外側のフレーム１０aとつながり、内側のフレーム１０ｂを下側から受ける。 FIG. 4 shows a wheelbarrow in which a fixed wheel is attached to the front wheel and a universal wheel is attached to the rear wheel. FIG. 4A is a side view showing the front wheelbarrow in a solid line and a wheelbarrow inserted from the rear in a dotted line. 4B is a rear view, and FIG. 4C is a plan view. The loading platform 10 is composed of an outer frame 10a and an inner frame 10b. The horizontal member 10c is connected to the outer frame 10a and receives the inner frame 10b from below.

外側のフレーム１０aは、後部は車輪枠３の内側に取り付き、前部の立ち上がりも含めて一本のパイプを加工したものである。内側のフレームも外側のフレームと同様に、後部は車輪枠３の内側に取り付き、前方の先端に車軸１０ｄが取り付けられる。車軸１０ｄの両端に前輪の固定輪が取り付く。 The outer frame 10a has a rear portion attached to the inner side of the wheel frame 3, and is formed by processing a single pipe including the front portion. Similarly to the outer frame, the inner frame is attached to the inner side of the wheel frame 3, and the axle 10d is attached to the front end. Front fixed wheels are attached to both ends of the axle 10d.

内側のフレーム１０ｂは横架材１０ｃに向かって上昇する部分１０ｂ１と、横架材１０ｃから下降する部分１０ｂ２からなり、図４（ａ）に示すように前の手押し車の後から後の手押し車を差し込むとき、後ろの手押し車の下降する部分１０ｂ２の外側は前の手押し車の上昇する部分１０ｂ１の内側を通過し、前の手押し車の外側のフレーム１０aの下に後の手押し車の前輪がもぐりこむ。 The inner frame 10b includes a portion 10b1 that rises toward the horizontal member 10c and a portion 10b2 that descends from the horizontal member 10c. As shown in FIG. 4A, the rear wheelbarrow after the front wheelbarrow. Is inserted, the outside of the descending portion 10b2 of the rear wheelbarrow passes through the inside of the ascending portion 10b1 of the front wheelbarrow, and the front wheel of the rear wheelbarrow is under the frame 10a outside the front wheelbarrow. Grapple.

荷台の幅は、取手支柱１０ｅ及び後輪車輪枠３の内内寸法より狭く、前後に前上りの勾配があるので、前の手押し車の取手支柱１０ｅの間をくぐり抜け、前の手押し車の荷台の上に重なり、後から差し込む手押し車の前輪の固定輪が浮き上がり地面から離れる。荷台先頭の立ち上がりは、取手支柱１０ｅの間に取り付けた小物入れの籠１０ｇの底より低く、前の手押し車の籠１０ｇの下を通り抜け、前の手押し車の立ち上がりの後に重なる。 Since the width of the loading platform is narrower than the inner dimensions of the handle column 10e and the rear wheel frame 3, and there is a forward and backward gradient, it passes through between the handle columns 10e of the front wheelbarrow, and the loading platform of the front wheelbarrow The fixed wheel of the front wheel of the wheelbarrow that is overlaid on the back and floats later rises away from the ground. The rise at the top of the loading platform is lower than the bottom of the bag 10g of the accessory case attached between the handle columns 10e, passes under the bag 10g of the front wheelbarrow, and overlaps after the rise of the front wheelbarrow.

前の手押し車の取手１０ｆは、後の手押し車の小物入れの籠１０ｇの下になって押し下げられ、手を離すと効くブレーキが解除され後輪の自在輪が自由になる。 The handle 10f of the front wheelbarrow is pushed down under the basket 10g of the accessory wheel of the rear wheelbarrow, and when it is released, the effective brake is released and the free wheel of the rear wheel becomes free.

後輪が自在輪で、これに取手から手を離すと効くブレーキが取り付く場合、後輪が固定輪でこれに取手から手を離すと効くブレーキが取り付く場合と同様に、前の手押し車の上に後の手押し車を載せるようにして重ねていき、後輪が浮くようにする。最後尾の車だけ前の手押し車の下から差し込むようにすると、複数の手押し車をひとまとめにして運ぶことが出来る。収納場所で最後尾の手押し車を前の手押し車の上に置きなおすと、使用者が一台ずつ抜き取りやすくなる。 If the rear wheel is a free wheel and the brake is effective when the handle is released from the handle, the rear wheel is fixed and the brake is applied when the hand is released from the handle. Put the rear wheelbarrow on top of the other so that the rear wheels float. If only the last car is inserted under the front wheelbarrow, multiple wheelbarrows can be carried together. If the last wheelbarrow is repositioned on the front wheelbarrow at the storage location, it will be easier for the user to pull out one by one.

車輪枠内部に取り付けた自在輪のブレーキの説明図Explanatory drawing of the brake of the free wheel attached inside the wheel frame 台座に取り付けた自在輪のブレーキの説明図Illustration of the free wheel brake attached to the pedestal ブレーキシューの形と機能の関係を説明する説明図Explanatory drawing explaining the relationship between brake shoe shape and function 前輪が固定輪で後輪が自在輪の手押し車の説明図Illustration of a wheelbarrow where the front wheel is a fixed wheel and the rear wheel is a free wheel

Explanation of symbols

１ブレーキシュー
２自在輪
３車輪枠
４台座
５プレート
６鋼球
７アーム
８円棒
９押しバネ
１０手押し車の部品 1 Brake shoe 2 Free wheel 3 Wheel frame 4 Base 5 Plate 6 Steel ball 7 Arm 8 Rod 9 Push spring 10 Wheelbarrow parts

Claims

An arm attached to a semi-circular or fan-shaped wheel with the upper half cut off leaving the rotation axis at the tip is rotatably supported on a rotation axis parallel to the rotation axis of the wheel attached to the wheel frame,
By moving the connecting rod that suspends the arm up and down, the arm moves the pendulum up and down in the vertical plane including the wheel that is attached to the wheel frame, and the wheel at the tip of the arm is attached to the wheel that is attached to the wheel frame. A brake that runs without touching and stops the rotation of the wheel that touches and attaches to the wheel frame.
When the wheel attached to the wheel frame rotates forward and reverse,
The lower arc portion of the wheel at the end of the arm rotates in contact with the wheel attached to the wheel frame, the straight portion of the upper cut surface of the wheel at the end of the arm hits the bottom surface of the wheel frame, and the opposite arc portion Hitting the wheel attached to the wheel frame, the wheel at the arm tip revolves around the contact point between the linear part of the wheel at the tip of the arm and the bottom surface of the wheel frame,
The contact point between the arc portion of the wheel at the arm tip and the wheel attached to the wheel frame moves in a direction approaching the rotation axis of the wheel attached to the wheel frame, and the rotation axis of the wheel at the arm tip is fixed. A brake that stops the rotation of the wheels that attach to the wheel frame.

The bearing case at the part that controls the swiveling of the free wheel that rotates the wheel frame around the center line of the cylindrical pedestal is made annular, and a conical space that is a through hole from the mounting seat to the inside of the wheel frame is provided inside the cylindrical pedestal In addition, a plate with a circular hole in the center on the upper surface of the cylindrical pedestal is mounted so that it can be rotated up and down by hinges, and the steel ball that stays on the circular hole in the plate and the upper part of the sphere inside the wheel frame are cut off. The lower part of the cut surface is a hemispherical brake shoe with a spherical surface and connected with a connecting rod and suspended,
In the space inside the conical through hole, a brake in which three elements of a steel ball, a brake shoe, and a circular rod connecting them are integrated so that the pendulum can freely move in all directions around the center of the steel ball. The brake that stops the rotation of the free wheel by rotating the plate with the steel ball on top and bottom, bringing the brake shoe into contact with the tire part on the outer periphery of the wheel and pulling it apart.
When the lower spherical surface of the brake shoe touches the outer periphery of the wheel and moves inside the conical space due to the rotation of the wheel, the free wheel rotates in the forward direction and the brake shoe is centered on the swivel axis of the free wheel. When moving in a direction away from the wheel rotation axis, the circumference of the upper plane of the brake shoe hits the lower surface of the cylindrical pedestal at the end of the movement, and the brake shoe rotates around the contact point that hits the lower surface of the cylindrical pedestal. The opposite side of the above contact is to hold the tire part on the outer periphery of the wheel to stop the rotation of the wheel,
When the free wheel rotates in the reverse direction and the brake shoe moves in the direction approaching the wheel rotation axis around the swivel axis of the free wheel, one side of the brake shoe enters between the bottom surface of the cylindrical base and the wheel. The brake of the free wheel where the rotation of the wheel engages the brake shoe and the brake shoe stops the rotation of the wheel by pressing the tire part on the outer periphery of the wheel