JP2007106183A - Double-wheel caster - Google Patents

Double-wheel caster Download PDF

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JP2007106183A
JP2007106183A JP2005297044A JP2005297044A JP2007106183A JP 2007106183 A JP2007106183 A JP 2007106183A JP 2005297044 A JP2005297044 A JP 2005297044A JP 2005297044 A JP2005297044 A JP 2005297044A JP 2007106183 A JP2007106183 A JP 2007106183A
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wheel
piece
braking
shaft
yoke
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JP4796370B2 (en
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Takaaki Sakai
孝明 酒井
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NANSIN CO Ltd
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NANSIN CO Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an improved double-wheel caster having brakes to the wheels and a lock for turning. <P>SOLUTION: The double-wheel caster is composed of a wheel braking shoe having a braking engagement part able to make engagement with an engagement part provided on each wheel, installed on a yoke arranged between the wheels movably in the wheel braking direction or the releasing direction, and energized in the braking direction, an actuator piece having at one end a turning lock piece able to be engaged with and disengaged from a vertical shaft engaging part provided in the lower part of a vertical shaft, with the other end pivoted on the yoke, and energized in the turning locking direction, and an operating member pivoted on the yoke and having a lever protruding on a yoke cover, whereby the wheel braking shoe is operated by changing over the lever so as to apply brakes to the wheel and release, and also the turning lock and releasing is conducted by moving the actuator piece in pivoting. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は車輪の制動と旋回ロックとを有する双輪キャスタの改良に関する。   The present invention relates to an improvement of a twin-wheel caster having wheel braking and a turning lock.

操作部材の操作で、車輪の制動と旋回ロックとを行う双輪キャスタとして、従来、特開平９−５８２０３号などが提案されている。
この双輪キャスタでは、車軸を介して双輪が回転可能に支持され、進行方向前方側に竪軸が回転自在に取り付けられたキャスタ本体を設けており、該キャスタ本体の進行方向後方側に凹部が形成され、該凹部内に、車輪の制動を行う車輪ロック部材が弾支され、両側突部が各車輪の内周に形成された係合溝に臨んでいた。操作部材は、前記車輪ロック部材に先端カム面を係合させて上記キャスタ本体に軸支され操作部を後方側に揺動可能に突出させており、車軸の下側に形成された水平な孔内には、旋回ロックを行うための竪軸ロック部材が挿通され、先端部が上記竪軸下端に設けられた旋回止めカラーに係脱可能に弾支されていた。そして、前記車輪ロック部材と竪軸ロック部材とにダブルストッパレバーの両端部がそれぞれ係止され、キャスタ本体に揺動可能に軸支されており、前記操作部材の操作により車輪と竪軸とを同時にロックするようになっていた。
しかし、上記構成では、キャスタ本体に、車輪ロック部材と、ダブルストッパレバーと、竪軸ロック部材とを内蔵する必要があり、構造が複雑であって組立に手間がかかると共に部品点数が多いという欠点があった。
また、ダブルストッパレバーは、その両端部が車輪ロック部材と竪軸ロック部材とに掛け止められているだけであるので、いずれか一方が外れた場合には竪軸ロック部材が作動しなくなる、という欠点もあった。
特開平９−５８２０３号公報 Japanese Patent Application Laid-Open No. 9-58203 has been proposed as a two-wheel caster that performs braking of a wheel and turning lock by operating an operation member.
In this twin-wheel caster, a twin-wheel is rotatably supported via an axle, and a caster body is provided on the front side in the advancing direction so that the shaft is rotatably mounted. A wheel lock member for braking the wheel is elastically supported in the recess, and both side protrusions face engagement grooves formed on the inner periphery of each wheel. The operating member has a front cam surface engaged with the wheel lock member and is pivotally supported by the caster body so that the operating portion protrudes to be able to swing rearward. A horizontal hole formed on the lower side of the axle. Inside, a shaft lock member for performing a rotation lock was inserted, and a tip portion was elastically supported by a rotation stop collar provided at the lower end of the shaft. Then, both end portions of the double stopper lever are locked to the wheel lock member and the shaft lock member, respectively, and are pivotally supported by the caster body so that the wheel and the shaft can be moved by operating the operation member. It was supposed to lock at the same time.
However, in the above configuration, it is necessary to incorporate a wheel lock member, a double stopper lever, and a shaft lock member in the caster body, and the structure is complicated, requiring time and effort for assembly, and having a large number of parts. was there.
Moreover, since the double stopper lever is only latched by the both ends of the wheel lock member and the shaft lock member, the shaft lock member does not operate when either one is removed. There were also drawbacks.
JP-A-9-58203

この発明は上記欠点を解消するために創案されたものであって、その主たる課題は、構成を更に簡単にすることができると共に、信頼性を高め、車輪の制動力や旋回ロック力を向上させることができる双輪キャスタを提供するものである。   The present invention was devised in order to eliminate the above-mentioned drawbacks, and its main problem is that the configuration can be further simplified, the reliability is improved, and the braking force and turning lock force of the wheel are improved. The present invention provides a twin-wheel caster that can perform such a process.

上記課題を解決するために、請求項１の発明では、
左右の車輪を軸支すると共に、竪軸が旋回自在に取り付けられたヨーク部を有し、操作部材の操作により車輪制動と旋回ロックを同時に行うようにした双輪キャスタにおいて、
車輪に設けた車輪係合部に係合可能な制動用係合部を有して車輪間に配置されたヨーク部に車輪制動方向ないし制動解除方向に移動可能に取り付けられた車輪制動片と、
該車輪制動片を車輪制動方向に付勢する第１付勢手段と、
一端に前記竪軸の下部に設けられた竪軸係合部に係脱可能な旋回ロック片を有し、他端側が前記ヨーク部に枢着された作動片と、
該作動片を旋回ロック片が竪軸係合部にロックする方向に付勢する第２付勢手段と、
前記ヨーク部に枢着されると共に、該ヨーク部と一体に形成されて車輪の上面を覆うヨークカバー上に突設したレバー片部を有する操作部材とからなり、
該レバー片部をロック位置に切り替えることで前記車輪制動片を第１付勢手段の付勢力に抗して押し下げて車輪の制動を解除し、また解除位置で前記車輪制動片を付勢力で上方へ跳ね上げさせて制動を行わせ、
前記制動解除時の車輪制動片の変位により作動片を第２付勢手段の付勢力に抗して旋回ロック解除方向に枢動させ、制動時に車輪制動片が離間方向に変位することにより作動片を第２付勢手段の付勢力によって旋回ロック方向に枢動させてなることを特徴とする。
また、請求項２の発明では、
前記竪軸が、ヨークと一体に形成された竪軸保持部に形成された貫通孔からなる竪孔に、該竪孔の下方から挿入され竪軸係合部を外周に有する筒状の係合部構成部と、該係合部構成部の上部に挿入されて係合部構成部の周壁と凹凸係合するカラーと、前記竪孔の上方から挿入されて竪軸保持部に被冠する外筒部を有すると共に、前記カラーの周壁と凹凸係合する内筒部を有するキャップ構成部と、該キャップ構成部の内筒部の外周に取り付けられた軸受部とからなって、取付軸となる大径のボルトの先端を係合部構成部からカラーを介してキャップ構成部を超えて上方に突出させ、ナットで緊締してなることを特徴とする。
更に、請求項３の発明では、
前記操作部材の操作片の裏面に突起が突設されており、
操作部材を制動方向に切り替えると、前記突起が車輪のトレッド面と衝合するようになっていることを特徴とする。 In order to solve the above problem, the invention of claim 1
In the two-wheel caster that pivotally supports the left and right wheels and has a yoke portion on which the shaft is pivotably attached, and is configured to simultaneously perform wheel braking and turning lock by operating the operation member.
A wheel braking piece having a braking engagement portion engageable with a wheel engagement portion provided on the wheel and attached to a yoke portion disposed between the wheels so as to be movable in a wheel braking direction or a braking release direction;
First urging means for urging the wheel braking piece in the wheel braking direction;
An operation piece having a pivot lock piece that can be engaged with and disengaged from a shaft engaging portion provided at a lower portion of the shaft at one end, and the other end being pivotally attached to the yoke portion;
Second urging means for urging the operating piece in a direction in which the turning lock piece locks to the shaft engaging portion;
And an operating member having a lever piece projecting on a yoke cover formed integrally with the yoke portion and covering the upper surface of the wheel.
By switching the lever piece to the lock position, the wheel braking piece is pushed down against the urging force of the first urging means to release the braking of the wheel, and the wheel braking piece is moved upward by the urging force at the release position. Jump to the top and brake.
The operating piece is pivoted in the turning lock releasing direction against the urging force of the second urging means by the displacement of the wheel braking piece at the time of releasing the brake, and the operating piece is moved by displacing the wheel braking piece in the separating direction at the time of braking. Is pivoted in the turning lock direction by the urging force of the second urging means.
In the invention of claim 2,
A cylindrical engagement in which the shaft is inserted from a lower side of the shaft hole into a shaft hole formed in a shaft holding portion formed integrally with the yoke and has a shaft engaging portion on the outer periphery. And a collar that is inserted into the upper portion of the engaging portion constituting portion and engages with the peripheral wall of the engaging portion constituting portion, and an outer portion that is inserted from above the shaft hole and is covered by the shaft holding portion. A cap component that has a cylindrical portion and has an inner cylindrical portion that engages with the peripheral wall of the collar, and a bearing portion that is attached to the outer periphery of the inner cylindrical portion of the cap component portion, and serves as a mounting shaft. The tip of the large-diameter bolt is protruded upward from the engaging portion constituting portion through the collar beyond the cap constituting portion, and is tightened with a nut.
Furthermore, in the invention of claim 3,
A protrusion protrudes from the back surface of the operation piece of the operation member,
When the operating member is switched to the braking direction, the protrusion is configured to abut against the tread surface of the wheel.

この発明は上記のように、旋回ロック方向に付勢している作動片を、ロック解除方向に切り替えられた操作部材により変位する車輪制動片の動きで上記付勢力に抗して旋回ロック解除方向に枢動するようにしたので、竪軸係合部に係脱する旋回ロック片は、ロック解除する際に枢動により離間するので、水平にスライドする場合に比べて確実にロック解除を行うことができる。
さらに、車輪の下方近傍に旋回ロック乃至ロック解除の機構を設ける必要がないので、構造が複雑とならず、軽量化を図ることができる。 In the present invention, as described above, the operation piece urged in the turning lock direction is moved in the turning lock release direction against the urging force by the movement of the wheel braking piece displaced by the operation member switched in the lock release direction. Since the pivot lock piece that engages and disengages from the shaft engaging portion is separated by pivoting when unlocked, the unlocking can be performed more securely than when sliding horizontally. Can do.
Further, since it is not necessary to provide a turning lock or unlock mechanism near the lower part of the wheel, the structure is not complicated and the weight can be reduced.

以下に、この発明の好適な実施形態を図面を参照しながら説明する。
双輪キャスタは、図１から図４に示すように、ヨーク部１と、このヨーク部１に車軸２を介して回転自在に支持された左右一対の双輪の車輪３と、ヨーク部１の進行方向前方側に形成された取付け孔４内に回転自在に嵌着された竪軸５とを備えている。 Preferred embodiments of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 to 4, the twin-wheel caster includes a yoke portion 1, a pair of left and right twin wheels 3 rotatably supported on the yoke portion 1 via an axle 2, and a traveling direction of the yoke portion 1. And a flange 5 that is rotatably fitted in a mounting hole 4 formed on the front side.

［竪軸］
ヨーク部１の前方には、図２に示すように上下に貫通し、上部が拡開する取付孔４が穿設されている。
そして、この取付孔４には、該取付孔４を有するヨーク部１の柱状部上面に被冠し中央に孔部を有するキャップ７１ａを有し、内側で垂下する上部カラー７１ｂを形成したキャップ部７１と、上部カラー７１ｂの下方延長上に隙間無く配置される筒状の中継カラー７２と、前記取付孔４の下方から挿入されて前記中継カラー７２と衝合する下部カラー７３ａを有し、該下部カラー７３ａの下端が大径に設定されて取付孔４の下方外側に突出する略ドーナツ状からなって外周に竪軸係合部７３ｂとしての凹部を等間隔に歯車状に有する旋回止め部７３が取り付けられる。 [竪 axis]
As shown in FIG. 2, a mounting hole 4 that penetrates up and down and expands at the top is formed in front of the yoke portion 1.
The mounting hole 4 has a cap 71a crowned on the upper surface of the columnar portion of the yoke 1 having the mounting hole 4 and having a hole in the center, and an upper collar 71b that hangs down on the inside is formed. 71, a cylindrical relay collar 72 disposed on the lower extension of the upper collar 71b without any gap, and a lower collar 73a inserted from below the mounting hole 4 and abutted against the relay collar 72, The lower collar 73a has a large diameter at the lower end and has a substantially donut shape projecting outwardly from the mounting hole 4 and has a recess as a shaft engaging portion 73b on the outer periphery in a gear shape at regular intervals. Is attached.

前記上部カラー７１ｂの外側には取付孔の拡開部との間に軸受部７４を嵌め込んでおり、前記上部カラー７１ｂ、中継カラー７２、下部カラー７３ａで形成された一連のボルト孔に、竪軸５のボルト頭部５ａを下向きにして挿入し、キャップ７１ａの孔から突出した竪軸５のネジ部５ｂにナット５ｃを緊締して前記カラー７１ｂ、７２、７３ａを固定している。   A bearing portion 74 is fitted on the outer side of the upper collar 71b with an enlarged portion of the mounting hole, and a series of bolt holes formed by the upper collar 71b, the relay collar 72, and the lower collar 73a The collar 71b, 72, 73a is fixed by tightening the nut 5c to the threaded portion 5b of the flange shaft 5 protruding from the hole of the cap 71a by inserting the bolt head 5a of the shaft 5 downward.

ここで、各カラー７１ｂ、７２、７３ａにはその周壁の当接面には、中心軸を中心にして周方向に点線で示す凹凸部が形成されて、相互に嵌合されており、各カラー７１ｂ、７２、７３ａを周方向に規制しており、上下方向は前記竪軸５によって拘束されている。
上記構成からなっているので、ヨーク部１は竪軸５およびこれに固定されたキャップ部７１と中継カラー７２と旋回止め部７３とを中心にして旋回することができ、また、竪軸５を抜くことで、各カラー即ち、キャップ部７１と中継カラー７２と旋回止め部７３とを取付孔４から抜いて取り外すことが可能となる。 Here, each collar 71b, 72, 73a has a concave and convex portion indicated by a dotted line in the circumferential direction around the central axis on the contact surface of the peripheral wall, and is fitted to each other. 71b, 72, 73a are restricted in the circumferential direction, and the vertical direction is restricted by the shaft 5.
Because of the above configuration, the yoke portion 1 can turn around the flange shaft 5 and the cap portion 71, the relay collar 72, and the anti-rotation portion 73 that are fixed to the flange shaft 5. By pulling out, it is possible to remove each collar, that is, the cap portion 71, the relay collar 72, and the anti-rotation portion 73 from the mounting hole 4.

［車輪制動片］
次に、ヨーク部１には、図２に示すように、進行方向の後方側の上部で、径方向に沿って凹部１１が形成されている。
この凹部１１には第１付勢手段となるコイルスプリング１２によって径方向外方に弾圧付勢された車輪制動片１３が収容される。
車輪制動片１３は、ヨーク部１の横幅から両側外方に突出する凹凸部からなる両側の制動用係合部１４が一体に設けられ（図３参照）、これら制動用係合部１４の凹凸部を両側車輪３の外周壁の内面に設けた車輪係合部としての係合溝３１に臨ませている。 [Wheel braking piece]
Next, as shown in FIG. 2, the yoke portion 1 is formed with a concave portion 11 along the radial direction at an upper portion on the rear side in the traveling direction.
The recess 11 accommodates a wheel braking piece 13 that is elastically biased radially outward by a coil spring 12 serving as a first biasing means.
The wheel braking piece 13 is integrally provided with brake engaging portions 14 on both sides formed by uneven portions protruding outward from the lateral width of the yoke portion 1 (see FIG. 3). The part faces the engaging groove 31 as a wheel engaging part provided on the inner surface of the outer peripheral wall of the both wheels 3.

［操作部材］
車輪制動片１３の外側には、図１に示すように、操作部材１５がヨーク部１に軸Ｐ１を介し上下に枢動可能に軸支される。
この操作部材１５は、ヨーク部１の凹部１１で枢着される保持片１６と、該保持片１６上に一体に形成された略く字状に折れ曲がったレバー片１７とからなっている。 [Operation member]
As shown in FIG. 1, an operating member 15 is pivotally supported on the yoke portion 1 so as to be pivotable up and down via a shaft P <b> 1.
The operation member 15 includes a holding piece 16 that is pivotally attached to the concave portion 11 of the yoke portion 1 and a lever piece 17 that is integrally formed on the holding piece 16 and is bent into a substantially square shape.

［カム面］
そして保持片１６の下端には中心より一方に偏った山形の傾斜面からなって長い方の先端カム面１８Ａと短い方の先端カム面１８Ｂが形成されており、車輪制動片１３の外側面に係合させている。
一方、レバー片１７はヨーク部１の上方で車輪の上方を覆うヨークカバー１０上で、進行方向後方側に露出させている。 [Cam surface]
A long tip cam surface 18A and a short tip cam surface 18B are formed at the lower end of the holding piece 16 and are formed as angled inclined surfaces that are biased to one side from the center. Engaged.
On the other hand, the lever piece 17 is exposed on the rear side in the traveling direction on the yoke cover 10 that covers the upper part of the wheel above the yoke part 1.

［操作部材］
この操作部材１５は、図４〜９に示すように制動用の操作ペダル１７ｂを後方へ倒した下方枢動位置としたときに、先端カム面の低位側面１８Ｂが車輪制動片１３の外側面と衝合し、このため、車輪制動片１３はコイルスプリング１２により付勢されて両側の制動用係合部１４が両側車輪の係合溝３１に係合され、車輪３を制動するようになっている。 [Operation member]
As shown in FIGS. 4 to 9, when the operation member 15 is in the lower pivot position where the brake operation pedal 17 b is tilted backward, the lower side surface 18 </ b> B of the tip cam surface For this reason, the wheel braking pieces 13 are urged by the coil springs 12 so that the braking engaging portions 14 on both sides are engaged with the engaging grooves 31 of the both side wheels to brake the wheels 3. Yes.

この際に、制動・旋回のロック用の操作ペダル１７ｂの裏面には、両側寄りに複数の突部９が下向きに突設されている。
そして、コイルスプリング１２に付勢されて加速されて傾倒する制動・旋回のロック用の操作ペダル１７ｂは、車輪３の弾性部材からなるトレッド面上に衝合するので、操作時の衝撃を緩衝することができ、騒音の発生を防止することができる。
そのために、ヨーク部１の上面に一体形成された庇状のヨークカバー１０の後端は、車輪３、３間の隙間に入り込むように幅狭に形成されている（図９参照）。 At this time, a plurality of projecting portions 9 project downward from both sides of the back surface of the operation pedal 17b for locking braking and turning.
The brake / turning lock operation pedal 17b, which is biased by the coil spring 12 and accelerated and tilts, abuts on the tread surface made of the elastic member of the wheel 3, so that shock during operation is buffered. And generation of noise can be prevented.
Therefore, the rear end of the bowl-shaped yoke cover 10 integrally formed on the upper surface of the yoke portion 1 is formed narrow so as to enter the gap between the wheels 3 and 3 (see FIG. 9).

また、図１〜３に示すように、操作ペダル１７ａを前方へ傾動した上方枢動位置とすれば、先端カム面の高位側１８Ａが車輪制動片１３の外側面をコイルスプリング１２に抗して押下し、両側の制動用係合部１４を係合溝３１から離脱させ、制動解除状態に保持するようになっている。   As shown in FIGS. 1 to 3, if the operation pedal 17 a is set to the upper pivot position tilted forward, the high-order side 18 </ b> A of the tip cam surface opposes the outer surface of the wheel braking piece 13 against the coil spring 12. The brake engaging portions 14 on both sides are released from the engaging grooves 31 and are held in the brake released state.

［作動片］
また、前記ヨーク部１には、前記凹部１１の下側で、前記操作部材１５の枢軸Ｐ１の下方に、作動片６の延出端を枢着する枢軸Ｐ２が設けられている。
本実施例で作動片６は、支持ヨーク１の後方を挟むように断面チャンネル状からなっており、その一対の側壁６０の上部には、上部後方で上方へ延びる一対のアーム部６１を有し、上部前方には前記車輪制動片１３の制動用係合部１４と衝合可能な衝合片部６２を有している。 [Operating piece]
Further, the yoke portion 1 is provided with a pivot P2 that pivotally attaches the extending end of the operating piece 6 below the pivot P1 of the operation member 15 below the concave portion 11.
In this embodiment, the operating piece 6 has a channel-like cross section so as to sandwich the rear side of the support yoke 1, and has a pair of arm portions 61 extending upward at the upper rear side at the upper part of the pair of side walls 60. In the upper part of the front side, there is an abutting piece portion 62 that can abut against the braking engaging portion 14 of the wheel braking piece 13.

［旋回ロック片７］
前記側壁６０の中途位置には、車軸２を嵌挿し車軸２に対して枢動可能な長孔６３が穿設されている（図６参照）。
また、一対の側壁６０の下端は図３に示すように底壁６５によって一連につながっており、該底壁６５の先端から屈曲して一対の爪部からなる旋回ロック片７が形成されている。
該旋回ロック片７は、前記竪軸５の竪軸係合部７３ｂの凹部に嵌合可能となっている。 [Swivel lock piece 7]
In the middle of the side wall 60, a long hole 63 is formed so that the axle 2 can be inserted and pivoted with respect to the axle 2 (see FIG. 6).
Further, the lower ends of the pair of side walls 60 are connected in series by a bottom wall 65 as shown in FIG. 3, and a turning lock piece 7 formed of a pair of claw portions is formed by bending from the tip of the bottom wall 65. .
The turning lock piece 7 can be fitted into the recess of the shaft engaging portion 73 b of the shaft 5.

［バネ］
作動片６には、該作動片６より下方に延びた支持ヨーク１のフック部１９に掛け止められて折れ曲がり枢軸Ｐ２に捲回されてから先端が作動片６の側壁６０に掛止められた第２付勢手段としてのバネ８が取り付けられている。
このバネ８は、作動片６を前記枢軸Ｐ２を支点として、衝合片部６２を制動用係合部１４と衝合させ、また旋回ロック片７を旋回ロック方向に枢動するように付勢している。 [Spring]
The actuating piece 6 is hooked on the hook portion 19 of the support yoke 1 extending downward from the actuating piece 6, bent and wound around the pivot P 2, and then the tip is hooked on the side wall 60 of the actuating piece 6. 2 A spring 8 is attached as a biasing means.
The spring 8 biases the actuating piece 6 with the pivot P2 as a fulcrum so that the abutting piece portion 62 abuts with the braking engaging portion 14 and pivots the turning lock piece 7 in the turning lock direction. is doing.

［制動・旋回フリー状態］
次に、上記実施例に係るキャスタの作用について説明する。
キャスタ３０は、制動解除、旋回ロック解除状態、すなわち、フリーに走行および旋回自在な状態では、図１に示すように、レバー片１７の上側を押圧して、操作部材１５を傾動させて上方の傾動位置に変位させる（図１参照）。 [Brake / turning free]
Next, the operation of the caster according to the above embodiment will be described.
The caster 30 presses the upper side of the lever piece 17 and tilts the operating member 15 in an upward state by releasing the brake and turning lock, ie, in a state where the vehicle can freely run and turn as shown in FIG. Displace to tilt position (see FIG. 1).

操作部材１５が上方の傾動位置に変位されると、先端カム面の高位側１８Ｂが車輪制動片１３の外側面をコイルスプリング１２に抗して押下げ、両側の制動用係合部１４を係合溝３１から離脱させ、制動解除状態に保持する。   When the operating member 15 is displaced to the upward tilting position, the higher side 18B of the tip cam surface pushes down the outer surface of the wheel braking piece 13 against the coil spring 12, and engages the brake engaging portions 14 on both sides. It is detached from the mating groove 31 and held in a brake released state.

このとき、車軸方向に降下する制動用係合部１４によって、作動片６の衝合片部６２が押し下げられ、作動片６はバネ８の付勢力に抗して枢軸Ｐ２を支点として図中反時計方向に枢動する。
これにより旋回ロック片７と竪軸係合部７３ｂとの係合が解かれ、車輪３の制動・旋回ロックを同時にフリーにすることができる。 At this time, the abutting piece portion 62 of the operating piece 6 is pushed down by the braking engaging portion 14 descending in the axle direction, and the operating piece 6 is opposed to the pivot P2 as a fulcrum against the urging force of the spring 8. Pivot clockwise.
Thereby, the engagement between the turning lock piece 7 and the shaft engaging portion 73b is released, and the braking / turning lock of the wheel 3 can be made free at the same time.

［制動・旋回ロック状態］
次に、走行および旋回ともロック状態とするには、図４に示すように、操作部材１５の下側を押圧して、レバー片１７を下方の傾動位置に変位させると、車輪制動片１３はコイルスプリング１２に付勢されて径方向外方に変位し、両側の制動用係合部１４が係合溝３１に係合し、車輪３が制動状態となる。 [Brake / swivel lock state]
Next, in order to lock both running and turning, as shown in FIG. 4, when the lower side of the operation member 15 is pressed and the lever piece 17 is displaced to the downward tilting position, the wheel braking piece 13 is The coil spring 12 is biased to displace radially outward, the braking engaging portions 14 on both sides engage with the engaging grooves 31, and the wheel 3 enters a braking state.

このとき、車輪方向に上昇する制動用係合部１４によって作動片６への係合が解かれ、作動片６は衝合片部６２を介して自由状態となり、バネ８の付勢力で押し上げられ、枢軸Ｐ２を支点として図中時計方向に枢動する。
このため、作動片６に設けた旋回ロック片７も一体となって枢動し、旋回ロック片７はバネ８により竪軸５下端に向かって付勢され、竪軸係合部７３ｂの凹部に嵌合する。
このとき、旋回ロック片７が竪軸係合部７３ｂの凹部に嵌らなくとも、竪軸係合部７３ｂは円環状に形成されているので、わずかな車輪３の旋回により、前記凹部に嵌合して、旋回ロックとなる。
このように、操作部材１５のワンタッチ操作により、車輪・旋回ロックを同時に行うことができる。 At this time, the engagement with the operating piece 6 is released by the braking engaging portion 14 rising in the wheel direction, and the operating piece 6 becomes free via the abutting piece portion 62 and is pushed up by the biasing force of the spring 8. , Pivot about the pivot P2 in the clockwise direction in the figure.
For this reason, the turning lock piece 7 provided on the operating piece 6 is also pivoted together, and the turning lock piece 7 is urged toward the lower end of the shaft 5 by the spring 8, and is placed in the recess of the shaft engaging portion 73b. Mating.
At this time, even if the turning lock piece 7 does not fit into the recess of the shaft engaging portion 73b, the shaft engaging portion 73b is formed in an annular shape. In combination, a turning lock is obtained.
Thus, the wheel / turning lock can be performed simultaneously by one-touch operation of the operation member 15.

このように、上記実施例にかかる双輪キャスタでは、簡単な構成でありながら、操作部材をワンタッチ操作することで、制動・旋回ロックをフリーとし、またロック状態に切り替えることができる。
また、組立時に、作動片６とバネ８を組みつけなければ、制動機能のみ有し、旋回ロックは行わない双輪キャスタとすることもでき、汎用性に優れる。
さらに、作動片の枢動により旋回ロック片を竪軸係合片の下側から嵌脱することができるので、従来のように竪軸係合片に水平に嵌脱する場合に比して、確実にロックないしロック解除を行うことができる。 As described above, in the twin wheel caster according to the above-described embodiment, the braking / turning lock can be made free and switched to the locked state by performing a one-touch operation on the operation member, although it has a simple configuration.
Further, if the operating piece 6 and the spring 8 are not assembled at the time of assembly, a dual-wheel caster that has only a braking function and does not perform a turning lock can be obtained.
Furthermore, since the pivot lock piece can be fitted / removed from the lower side of the shaft engaging piece by the pivot of the operating piece, compared with the case where it is fitted / detached horizontally to the shaft engaging piece as in the prior art, It can be locked or unlocked reliably.

なお、上記実施例では、竪軸係合部の係合構造を凹凸形状とし、旋回ロック片を竪軸係合部７３ｂに凹凸係合させるようにしたが、凹部に替えて縦溝やギア形状、鋸歯形状などとしてもよい。
その他、要するにこの発明の要旨を変更しない範囲で種々設計変更しうること勿論である。 In the above-described embodiment, the engagement structure of the shaft engaging portion is made uneven, and the swivel lock piece is engaged with the shaft engaging portion 73b in an uneven manner. Alternatively, a sawtooth shape may be used.
In addition, it goes without saying that various design changes can be made without departing from the scope of the present invention.

キャスタのロック解除状態の側面図である。It is a side view of the lock release state of a caster. ロック解除状態の要部断面図である。It is principal part sectional drawing of a lock release state. キャスタのロック解除状態の斜視図である。It is a perspective view of the lock release state of a caster. キャスタのロック状態の側面図である。It is a side view of the lock state of a caster. ロック状態の要部断面図である。It is principal part sectional drawing of a locked state. キャスタのロック状態の斜視図である。It is a perspective view of the lock state of a caster. キャスタのロック状態の背面図である。It is a rear view of the caster locked state. 同底面図である。It is the bottom view. 同平面図である。It is the same top view.

符号の説明Explanation of symbols

１ ヨーク部
２ 車軸
３ 車輪
４ 取付け孔
５ 竪軸
６ 作動片
７ 旋回ロック片
８ バネ
１０ ヨークカバー
１１ 凹部
１２ コイルスプリング
１３ 車輪制動片
１４ 両側の制動用係合部
１５ 操作部材
１６ 保持片
１７ レバー片
１８Ａ 先端カム面の低位側面
１８Ｂ 先端カム面の高位側
１９ フック部
３１ 係合溝
５０ 取付孔
７３ｂ 竪軸係合部
６０ 一対の側壁
６１ 一対のアーム部
６２ 衝合片部
６３ 長孔
６５ 底壁
DESCRIPTION OF SYMBOLS 1 Yoke part 2 Axle 3 Wheel 4 Mounting hole 5 Shaft 6 Actuation piece 7 Rotation lock piece 8 Spring 10 Yoke cover 11 Recess 12 Coil spring 13 Wheel braking piece 14 Both sides engaging part 15 Operation member 16 Holding piece 17 Lever Piece 18A Lower side surface 18B of the tip cam surface Higher side 19 of the tip cam surface 19 Hook portion 31 Engaging groove 50 Mounting hole 73b Shaft engaging portion 60 A pair of side walls 61 A pair of arm portions 62 Abutting piece portion 63 Long hole 65 Bottom wall

Claims (3)

左右の車輪を軸支すると共に、竪軸が旋回自在に取り付けられたヨーク部を有し、操作部材の操作により車輪制動と旋回ロックを同時に行うようにした双輪キャスタにおいて、
車輪に設けた車輪係合部に係合可能な制動用係合部を有して車輪間に配置されたヨーク部に車輪制動方向ないし制動解除方向に移動可能に取り付けられた車輪制動片と、
該車輪制動片を車輪制動方向に付勢する第１付勢手段と、
一端に前記竪軸の下部に設けられた竪軸係合部に係脱可能な旋回ロック片を有し、他端側が前記ヨーク部に枢着された作動片と、
該作動片を旋回ロック片が竪軸係合部にロックする方向に付勢する第２付勢手段と、
前記ヨーク部に枢着されると共に、該ヨーク部と一体に形成されて車輪の上面を覆うヨークカバー上に突設したレバー片部を有する操作部材とからなり、
該レバー片部をロック位置に切り替えることで前記車輪制動片を第１付勢手段の付勢力に抗して押し下げて車輪の制動を解除し、また解除位置で前記車輪制動片を付勢力で上方へ跳ね上げさせて制動を行わせ、
前記制動解除時の車輪制動片の変位により作動片を第２付勢手段の付勢力に抗して旋回ロック解除方向に枢動させ、制動時に車輪制動片が離間方向に変位することにより作動片を第２付勢手段の付勢力によって旋回ロック方向に枢動させてなることを特徴とする双輪キャスタ。 In the two-wheel caster that pivotally supports the left and right wheels and has a yoke portion on which the shaft is pivotably attached, and is configured to simultaneously perform wheel braking and turning lock by operating the operation member.
A wheel braking piece having a braking engagement portion engageable with a wheel engagement portion provided on the wheel and attached to a yoke portion disposed between the wheels so as to be movable in a wheel braking direction or a braking release direction;
First urging means for urging the wheel braking piece in the wheel braking direction;
An operation piece having a pivot lock piece that can be engaged with and disengaged from a shaft engaging portion provided at a lower portion of the shaft at one end, and the other end being pivotally attached to the yoke portion;
Second urging means for urging the operating piece in a direction in which the turning lock piece locks to the shaft engaging portion;
And an operating member having a lever piece projecting on a yoke cover formed integrally with the yoke portion and covering the upper surface of the wheel.
By switching the lever piece to the lock position, the wheel braking piece is pushed down against the urging force of the first urging means to release the braking of the wheel, and the wheel braking piece is moved upward by the urging force at the release position. Jump to the top and brake.
The operating piece is pivoted in the turning lock releasing direction against the urging force of the second urging means by the displacement of the wheel braking piece at the time of releasing the brake, and the operating piece is moved by displacing the wheel braking piece in the separating direction at the time of braking. The two-wheel caster, wherein the two-wheel caster is pivoted in the turning lock direction by the urging force of the second urging means. 竪軸が、ヨークと一体に形成された竪軸保持部に形成された貫通孔からなる竪孔に、該竪孔の下方から挿入され竪軸係合部を外周に有する筒状の係合部構成部と、該係合部構成部の上部に挿入されて係合部構成部の周壁と凹凸係合するカラーと、前記竪孔の上方から挿入されて竪軸保持部に被冠する外筒部を有すると共に、前記カラーの周壁と凹凸係合する内筒部を有するキャップ構成部と、該キャップ構成部の内筒部の外周に取り付けられた軸受部とからなって、取付軸となる大径のボルトの先端を係合部構成部からカラーを介してキャップ構成部を超えて上方に突出させ、ナットで緊締してなることを特徴とする請求項１に記載の双輪キャスタ。   A cylindrical engagement portion in which a shaft is inserted from a lower side of the shaft hole into a shaft hole formed in a shaft shaft holding portion formed integrally with the yoke and has a shaft shaft engaging portion on the outer periphery. A construction part, a collar inserted into the engagement part construction part and being engaged with the peripheral wall of the engagement part construction part, and an outer cylinder that is inserted from above the shaft hole and is covered by the shaft holding part A cap component having an inner cylindrical portion that engages with the peripheral wall of the collar and a bearing portion attached to the outer periphery of the inner cylindrical portion of the cap component. 2. The twin-wheel caster according to claim 1, wherein a tip of a bolt having a diameter protrudes upward from the engaging portion constituting portion through the collar beyond the cap constituting portion and is tightened with a nut. 操作部材の操作片の裏面に突起が突設されており、
操作部材を制動方向に切り替えると、前記突起が車輪のトレッド面と衝合するようになっていることを特徴とする請求項１に記載の双輪キャスタ。
A protrusion is provided on the back surface of the operation piece of the operation member,
The twin-wheel caster according to claim 1, wherein when the operation member is switched to the braking direction, the protrusions abut against the tread surface of the wheel.
JP2005297044A 2005-10-11 2005-10-11 Twin wheel casters Active JP4796370B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009248836A (en) * 2008-04-09 2009-10-29 Catis Pacific Mfg Corp Ltd Caster with double footboards
JP2011218141A (en) * 2010-03-23 2011-11-04 Toshin Seisakusho:Kk Caster and caster unit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01141101A (en) * 1987-10-21 1989-06-02 Colson Castors Europ Ltd Castor
JPH05310004A (en) * 1992-05-01 1993-11-22 Hanmaa Kiyasutaa Kk Mechanism for braking caster
JPH08132813A (en) * 1994-11-02 1996-05-28 Nanshin:Kk Caster braking mechanism
JPH08207504A (en) * 1995-10-09 1996-08-13 Nanshin:Kk Caster locking device
JP2001260607A (en) * 2000-03-23 2001-09-26 Naiki:Kk Caster having stopper
JP2004050979A (en) * 2002-07-19 2004-02-19 Nansin Co Ltd Double wheel caster

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01141101A (en) * 1987-10-21 1989-06-02 Colson Castors Europ Ltd Castor
JPH05310004A (en) * 1992-05-01 1993-11-22 Hanmaa Kiyasutaa Kk Mechanism for braking caster
JPH08132813A (en) * 1994-11-02 1996-05-28 Nanshin:Kk Caster braking mechanism
JPH08207504A (en) * 1995-10-09 1996-08-13 Nanshin:Kk Caster locking device
JP2001260607A (en) * 2000-03-23 2001-09-26 Naiki:Kk Caster having stopper
JP2004050979A (en) * 2002-07-19 2004-02-19 Nansin Co Ltd Double wheel caster

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009248836A (en) * 2008-04-09 2009-10-29 Catis Pacific Mfg Corp Ltd Caster with double footboards
JP2011218141A (en) * 2010-03-23 2011-11-04 Toshin Seisakusho:Kk Caster and caster unit

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