JP5503713B2 - Wheel mounting structure - Google Patents

Description

本発明は、車輪取付構造に関する。   The present invention relates to a wheel mounting structure.

従来、車輪を回転自在に支持する支持部材（支持ヨーク）を備えたキャスター等の車輪ユニットを、台車の荷台等の被取付部材に着脱自在に取着する車輪取付構造は、支持部材の上部に雄ねじ部を突設し、被取付部材にねじ孔を形成して、螺着により着脱自在に取着していた（例えば、特許文献１参照）。   Conventionally, a wheel mounting structure for detachably attaching a wheel unit such as a caster provided with a supporting member (supporting yoke) for rotatably supporting a wheel to a mounted member such as a loading platform of a carriage is provided at an upper portion of the supporting member. A male screw portion is provided so as to form a screw hole in the attached member, and is detachably attached by screwing (for example, see Patent Document 1).

特開２００４−１６８１２０号公報JP 2004-168120 A

しかし、螺着による取付構造は、旋回や振動による緩みが発生しないように、強く締め付けるため、締め付け用のスパナ等の工具が必要であると共に、車輪ユニット交換作業に手間と時間がかかるといった問題があった。   However, the mounting structure by screwing is strongly tightened so as not to be loosened by turning or vibration, so that a tool such as a wrench for tightening is necessary and the work of replacing the wheel unit takes time and effort. there were.

そこで、本発明は、車輪ユニットを被取付部材に取着するための工具が不要で、車輪ユニットの交換作業を容易かつ迅速に行なうことが可能な車輪取付構造の提供を目的とする。   Therefore, an object of the present invention is to provide a wheel mounting structure that does not require a tool for attaching the wheel unit to the member to be mounted and can easily and quickly replace the wheel unit.

上記目的を達成するために、本発明の車輪取付構造は、車輪を回転自在に支持する支持部材を有する車輪ユニットを、被取付部材に着脱自在に取着する着脱手段を備えた車輪取付構造に於て、上記着脱手段は、上記車輪ユニットに突設されると共にラジアル外方に開口した凹部を有する差込軸部と、上記被取付部材に設けられ該差込軸部が差し込まれる差込孔を有する筒本体部と、該筒本体部に軸方向スライド自在に外嵌状に取着された筒状のスライド部材と、上記筒本体部に取着され上記凹部と係合する係合部位を有する抜け止め部材と、を備え、上記抜け止め部材は、上記筒本体部の外周壁部に設けられた貫孔に遊嵌状に保持される球体から成り、上記係合部位は、上記球体が上記外周壁部の内面から突出する部位から成り、上記スライド部材によって上記係合部位のラジアル外方向への逃げを阻止して上記凹部に係合させた取付状態と、上記スライド部材の軸方向の移動によって上記係合部位がラジアル方向へ移動自在な抜き差し可能状態と、に切換えて、上記車輪ユニットを上記被取付部材に着脱自在に取り付けるように構成し、さらに、上記取付状態で、上記差込軸部の先端面が上記差込孔の奥壁部に当接して上記被取付部材から上記車輪ユニットへの荷重、及び、車輪接地面の障害物を乗り上げた際の上記車輪ユニットから上記被取付部材への押し上げ力を受けるように構成したものである。 In order to achieve the above object, the wheel mounting structure of the present invention is a wheel mounting structure provided with an attaching / detaching means for detachably attaching a wheel unit having a support member for rotatably supporting a wheel to an attached member. The attaching / detaching means includes an insertion shaft portion protruding from the wheel unit and having a recess opened radially outward, and an insertion hole provided in the attached member and into which the insertion shaft portion is inserted. A cylindrical main body portion, a cylindrical slide member attached to the cylindrical main body portion so as to be slidable in the axial direction, and an engagement portion that is attached to the cylindrical main body portion and engages with the concave portion. A retaining member, and the retaining member comprises a sphere that is held loosely in a through-hole provided in the outer peripheral wall portion of the cylindrical main body, and the engaging portion includes the sphere. A portion projecting from the inner surface of the outer peripheral wall, An attachment state in which the engagement portion is prevented from escaping radially outward by the member and engaged with the recess, and the engagement portion is movable in the radial direction by the axial movement of the slide member. The wheel unit is configured to be detachably attached to the attached member, and in the attached state, the distal end surface of the insertion shaft portion is connected to the back wall portion of the insertion hole. abutment to load to the wheel unit from above the mounting member, and in which from the wheel unit at the time of riding the obstacle wheel vertical plane and configured to receive a push-up force to the mounted member .

または、車輪を回転自在に支持する支持部材を有する車輪ユニットを、被取付部材に着脱自在に取着する着脱手段を備えた車輪取付構造に於て、上記着脱手段は、上記車輪ユニットに突設されると共にラジアル外方に開口した凹部を有する差込軸部と、上記被取付部材に設けられ該差込軸部が差し込まれる差込孔を有する筒本体部と、該筒本体部に軸方向スライド自在に外嵌状に取着された筒状のスライド部材と、上記筒本体部に取着され上記凹部と係合する係合部位を有する抜け止め部材と、を備え、上記抜け止め部材は、上記筒本体部に取着される筒状部材から成り、上記筒状部材は、拡径用スリットによって形成された複数本の弾性変形可能な揺動片部と、該揺動片部からラジアル内方に突設された上記係合部位と、を有し、上記スライド部材によって上記係合部位のラジアル外方向への逃げを阻止して上記凹部に係合させた取付状態と、上記スライド部材の軸方向の移動によって上記係合部位がラジアル方向へ移動自在な抜き差し可能状態と、に切換えて、上記車輪ユニットを上記被取付部材に着脱自在に取り付けるように構成し、さらに、上記取付状態で、上記差込軸部の先端面が上記差込孔の奥壁部に当接して上記被取付部材から上記車輪ユニットへの荷重、及び、車輪接地面の障害物を乗り上げた際の上記車輪ユニットから上記被取付部材への押し上げ力を受けるように構成したものである。 Alternatively, in a wheel mounting structure provided with a detachable means for detachably attaching a wheel unit having a support member for rotatably supporting a wheel to the attached member, the detachable means protrudes from the wheel unit. And an insertion shaft portion having a recess opened radially outward, a cylinder main body portion having an insertion hole provided in the attached member into which the insertion shaft portion is inserted, and an axial direction in the cylinder main body portion A cylindrical slide member that is slidably attached in an outer fitting manner, and a retaining member that has an engaging portion that is attached to the cylindrical body and engages with the concave portion. A cylindrical member attached to the cylindrical main body, and the cylindrical member includes a plurality of elastically deformable oscillating pieces formed by a diameter-enlarging slit and a radial from the oscillating pieces. The engaging portion projecting inwardly, and An attachment state in which the engagement portion is prevented from escaping radially outward by the movement member and engaged with the recess, and the engagement portion is movable in the radial direction by the axial movement of the slide member. The wheel unit is configured to be detachably attached to the attachment member, and the tip end surface of the insertion shaft portion is the back wall portion of the insertion hole in the attachment state. which was configured to receive the upward force from the member being attached load to the wheel unit, and, from the wheel unit at the time of riding the obstacle wheel vertical plane to the mounted member to abut against the is there.

本発明によれば、スパナ等の締め付け工具や、特殊な専用工具が必要なく、容易かつ迅速に車輪ユニットを被取付部材に取着することができる。また、被取付部材から車輪ユニットを取り外す際も工具が不要で、車輪ユニットの交換作業を容易に直ぐ行なうことができ、急な車輪の故障に迅速に対応できる。   According to the present invention, there is no need for a tightening tool such as a spanner or a special dedicated tool, and the wheel unit can be attached to the mounted member easily and quickly. Further, when removing the wheel unit from the member to be attached, no tool is required, the wheel unit can be easily replaced, and a rapid wheel failure can be quickly dealt with.

本発明の実施の形態の側面図である。It is a side view of an embodiment of the present invention. 図１の要部断面図である。It is principal part sectional drawing of FIG. 作用を説明するための要部断面図である。It is principal part sectional drawing for demonstrating an effect | action. 作用を説明するための要部断面図である。It is principal part sectional drawing for demonstrating an effect | action. 他の実施形態を示す要部断面図である。It is principal part sectional drawing which shows other embodiment. 作用を説明するための要部断面図である。It is principal part sectional drawing for demonstrating an effect | action. 作用を説明するための要部断面図である。It is principal part sectional drawing for demonstrating an effect | action.

以下、図示の実施形態に基づき本発明を詳説する。
本発明の車輪取付構造は、図１に示すように、路面や床面等の車輪接地面Ｇを走行するための車輪11と、車輪11を水平状軸心廻りに回転自在に支持する支持部材12と、を備えた車輪ユニットＹを、台車の荷台やストレッチャーの脚部等の被取付部材Ｄに、着脱自在に取着するための着脱手段５を具備している。
着脱手段５は、車輪ユニットＹの上部から突設された差込軸部59と、被取付部材Ｄの下部から突設されると共に差込軸部59が着脱自在に差し込まれる軸保持部50と、から成る。 Hereinafter, the present invention will be described in detail based on illustrated embodiments.
As shown in FIG. 1, the wheel mounting structure of the present invention includes a wheel 11 for traveling on a wheel contact surface G such as a road surface or a floor surface, and a support member that rotatably supports the wheel 11 around a horizontal axis. 12 is provided with attachment / detachment means 5 for detachably attaching the wheel unit Y including 12 to a member D to be attached such as a platform of a carriage or a leg of a stretcher.
The attaching / detaching means 5 includes an insertion shaft portion 59 projecting from the upper portion of the wheel unit Y, and a shaft holding portion 50 projecting from the lower portion of the attached member D and into which the insertion shaft portion 59 is detachably inserted. , Consisting of.

図２に於て、差込軸部59は、円柱状に形成され、ラジアル外方に開口した凹部59ａを有している。
凹部59ａは、外周凹溝型に形成され、溝幅が差込軸部59のラジアル外方へ向かって次第に拡大するように（上下の）側壁61，61を傾斜状に設けている。
また、差込軸部59は、先端に向かうにつれて次第に縮径する差込用のガイドテーパ面59ｂを先端部に有している。 In FIG. 2, the plug-in shaft portion 59 is formed in a columnar shape and has a concave portion 59a that opens radially outward.
The concave portion 59a is formed in an outer peripheral concave groove shape, and (upper and lower) side walls 61, 61 are provided in an inclined manner so that the groove width gradually increases toward the radial outer side of the insertion shaft portion 59.
Further, the insertion shaft portion 59 has a guide taper surface 59b for insertion that gradually decreases in diameter toward the tip, at the tip.

軸保持部50は、被取付部材Ｄの下部から突設されると共に差込軸部59が差し込まれる円筒状の筒本体部51と、筒本体部51に上下方向スライド自在に外嵌状に取着された円筒状のスライド部材52と、スライド部材52を下方（差込軸部59の基端側）に常時弾発付勢する弾発付勢部材53と、弾発付勢部材53によって弾発付勢されたスライド部材52が筒本体部51から脱落するのを防止するＣ字状乃至円環状のストッパーリング56と、を備えている。
さらに、軸保持部50は、筒本体部51に取着され凹部59ａと係合する係合部位55ａを有する抜け止め部材55を備えている。 The shaft holding part 50 protrudes from the lower part of the member D to be attached, and has a cylindrical tube main body 51 into which the insertion shaft part 59 is inserted, and an external fitting that is slidable in the vertical direction on the tube main body 51. The attached cylindrical slide member 52, the bullet urging member 53 that constantly urges the slide member 52 downward (the base end side of the insertion shaft portion 59), and the bullet urging member 53 And a C-shaped or annular stopper ring 56 for preventing the biased slide member 52 from falling off the cylinder main body 51.
Further, the shaft holding portion 50 includes a retaining member 55 having an engagement portion 55a that is attached to the tube main body portion 51 and engages with the recess 59a.

抜け止め部材55は、筒本体部51の外周壁部51ｃに設けられた複数の貫孔51ｄ，51ｄに、夫々、自転可能に、遊嵌状に保持される鋼球等の球体７，７から成る。そして、係合部位55ａは、外周壁部51ｃの内面から突出する球体７の半球状の部位から成る。   The retaining member 55 is formed by a plurality of through holes 51d and 51d provided in the outer peripheral wall portion 51c of the cylinder main body 51. Become. The engaging portion 55a is a hemispherical portion of the sphere 7 protruding from the inner surface of the outer peripheral wall portion 51c.

スライド部材52は、弾発付勢部材53によって上下一方向（下方）へ弾発付勢され、ストッパーリング56に押し付けられて移動が規制された状態で、複数の貫孔51ｄを、筒本体部51のラジアル外方から包囲して、複数の球体７の係合部位55ａが、ラジアル外方へ逃げるのを阻止し、凹部59ａと係合部位55ａとの係合状態を保持するように設けている。
また、図３に示すように、スライド部材52が使用者の手動力等の外部操作力によって、弾発付勢部材53の弾発力に抗する方向（上方）にスライド移動すると、球体７が貫孔51ｄ内を筒本体部51のラジアル内外方向へ移動自在となるように設けている。 The slide member 52 is elastically urged in one vertical direction (downward) by the elastic urging member 53, and is pressed against the stopper ring 56 to restrict the movement, so that the plurality of through-holes 51d are inserted into the cylinder main body portion. It is provided so as to surround the 51 radial outer sides and prevent the engaging portions 55a of the plurality of spheres 7 from escaping radially outward and to maintain the engagement state between the concave portions 59a and the engaging portions 55a. Yes.
As shown in FIG. 3, when the slide member 52 is slid in a direction (upward) against the elastic force of the elastic biasing member 53 by an external operation force such as a manual force of the user, the sphere 7 is moved. The through-hole 51d is provided so as to be movable inward and outward in the radial direction of the cylinder main body 51.

弾発付勢部材53は、圧縮コイルバネであって、筒本体部51に外嵌状に配設されると共にスライド部材52に内嵌状に配設されている。そして、一端側が筒本体部51の外面に設けられた外面段差部51ｆに当接して上方への移動が阻止され、他端側がスライド部材52の内面に設けられた内面段差部52ｆを押圧するように配設されている。
ストッパーリング56は、金属製線材から成り、筒本体部51の先端に形成された外周環状溝51ｅに外嵌状に装着している。また、装着を容易にするために、弾性的に拡径可能なＣ字状とするのが好ましい。
筒本体部51は、差込軸部59が挿入される差込孔51ａを有し、閉塞状又は内鍔状の底壁部（奥壁部）51ｊを有する有底円筒状である。 The bullet urging member 53 is a compression coil spring, and is arranged on the cylinder main body 51 in an outer fitting manner and on the slide member 52 in an inner fitting manner. Then, one end is in contact with the outer surface step portion 51f provided on the outer surface of the cylinder main body portion 51 and is prevented from moving upward, and the other end side presses the inner surface step portion 52f provided on the inner surface of the slide member 52. It is arranged.
The stopper ring 56 is made of a metal wire, and is attached to an outer peripheral annular groove 51e formed at the tip of the cylinder body 51 in an outer fitting manner. Moreover, in order to make mounting | wearing easy, it is preferable to set it as the C-shape which can be expanded elastically.
The cylinder main body 51 has an insertion hole 51a into which the insertion shaft portion 59 is inserted, and has a bottomed cylindrical shape having a closed or inner flange-shaped bottom wall portion (back wall portion) 51j.

また、図３に於て、スライド部材52が弾発付勢部材53の弾発力に抗する方向に所定ストローク移動して、球体７が外周壁部51ｃの外面から突出した場合に、その球体７の外方突出部位に当接して、球体７が貫孔51ｄから脱落するのを防止するテーパー状の当り面52ｂを、先端開口内縁部に有している。
また、スライド部材52が弾発付勢部材53の弾発力に抗する方向に所定ストローク移動した場合に、スライド部材52の基端部（上部）が筒本体部51の基端部（上部）の外面に設けられた当り壁部51ｋに当接するように設けて、弾発付勢部材53に所定の圧縮力以上かからないようにするのが望ましい。また、筒本体部51とスライド部材52と差込軸部59は、同軸心状に（鉛直状軸心Ｌに軸心を略一致させて）配設されている。球体７は、筒本体部51の軸心廻りに等間隔に複数設けられている。 Further, in FIG. 3, when the slide member 52 moves a predetermined stroke in a direction against the elastic force of the elastic biasing member 53 and the spherical body 7 protrudes from the outer surface of the outer peripheral wall portion 51c, the spherical body 7 has a tapered contact surface 52b at the inner edge of the tip opening to prevent the spherical body 7 from dropping out of the through hole 51d.
Further, when the slide member 52 is moved by a predetermined stroke in a direction against the elastic force of the elastic biasing member 53, the base end portion (upper portion) of the slide member 52 is the base end portion (upper portion) of the tube main body portion 51. It is desirable to provide the abutting wall portion 51k in contact with the outer wall surface so as not to apply a predetermined compressive force or more to the bullet urging member 53. Further, the cylinder main body 51, the slide member 52, and the insertion shaft 59 are arranged coaxially (with the axis substantially coincided with the vertical axis L). A plurality of spheres 7 are provided at equal intervals around the axis of the tube main body 51.

次に、本発明の車輪取付構造の作用（使用方法）について説明する。
図２に示すように、取付状態は、スライド部材52が、下方へ弾発付勢され、ストッパーリング56によって下方への移動が規制されて、所定位置に配設されている。このスライド部材52によって球体７の係合部位55ａがラジアル外方向へ逃げるのを阻止し、係合部位55ａを凹部59ａに係合させて保持している。球体７によって、車輪ユニットＹが被取付部材Ｄの軸保持部50から脱落するのを阻止する（抜け止めを行なう）。 Next, an operation (usage method) of the wheel mounting structure of the present invention will be described.
As shown in FIG. 2, in the mounted state, the slide member 52 is elastically biased downward, and the downward movement is restricted by the stopper ring 56, and is arranged at a predetermined position. The sliding member 52 prevents the engaging portion 55a of the sphere 7 from escaping radially outward, and the engaging portion 55a is engaged with and held by the recess 59a. The spherical body 7 prevents the wheel unit Y from dropping from the shaft holding portion 50 of the attached member D (prevents coming off).

図２の取付状態から、図３に示すように、外部操作力によって、弾発付勢部材53の弾発力（バネ力）に抗して、スライド部材52が上方へスライド移動されると、球体７の係合部位55ａがラジアル外方向へ移動自在となる。そして、差込軸部59と軸保持部50の間に外部からの引抜き操作力が付与されると、球体７が、凹部59ａの側壁61を摺接して凹部59ａからスムーズに抜け出し、差込軸部59の外周面59ｄによって、ラジアル外方へ押し出され、差込軸部59が引き抜かれる。   When the slide member 52 is slid upward from the attached state of FIG. 2 against the elastic force (spring force) of the elastic biasing member 53 by an external operation force as shown in FIG. The engaging portion 55a of the sphere 7 can move outward in the radial direction. Then, when an external pulling operation force is applied between the insertion shaft portion 59 and the shaft holding portion 50, the sphere 7 comes out of the recess 59a smoothly by slidingly contacting the side wall 61 of the recess 59a. The outer peripheral surface 59d of the portion 59 is pushed radially outward, and the insertion shaft portion 59 is pulled out.

その後、外部操作力が解除されると、図４に示すように、スライド部材52が下方へ弾発付勢され、ストッパーリング56によって下方への移動が規制され、所定位置に配設され、軸保持部50と差込軸部59が離間した取り外し状態となる。   Thereafter, when the external operating force is released, as shown in FIG. 4, the slide member 52 is elastically biased downward, the downward movement is restricted by the stopper ring 56, and the slide member 52 is disposed at a predetermined position. The holding portion 50 and the insertion shaft portion 59 are in a detached state in which they are separated from each other.

また、図４の取外し状態（非取付状態）から、図３に示すように、外部操作力によって、スライド部材52が上方へスライド移動されると、球体７の係合部位55ａがラジアル外方向へ移動自在となる。差込軸部59と軸保持部50の間に外部からの差込操作力が付与されると、球体７が、差込軸部59のガイドテーパ面59ｂによってラジアル外方へ押し出され、外周面59ｄを摺接し、その後、凹部59ａの側壁61に沿って係合部位55ａがスムーズに溝内に落ち込んで係合状態となる。   Further, as shown in FIG. 3, when the slide member 52 is slid upward from the detached state (non-attached state) of FIG. 4 by an external operation force, the engaging portion 55a of the sphere 7 is radially outward. It becomes movable. When an insertion operation force from the outside is applied between the insertion shaft portion 59 and the shaft holding portion 50, the sphere 7 is pushed radially outward by the guide taper surface 59b of the insertion shaft portion 59, and the outer peripheral surface. 59d is brought into slidable contact, and thereafter, the engagement portion 55a smoothly falls into the groove along the side wall 61 of the recess 59a to be engaged.

そして、外部操作力が解除されると、図２に示すように、球体７の係合部位55ａがラジアル外方向へ逃げるのを阻止され、球体７の係合部位55ａが凹部59ａに係合した状態が保持された取付状態となる。   When the external operating force is released, the engagement portion 55a of the sphere 7 is prevented from escaping radially outward as shown in FIG. 2, and the engagement portion 55a of the sphere 7 is engaged with the recess 59a. It becomes an attachment state in which the state is maintained.

このように、図２の取付状態と、図３に示すように、スライド部材52が弾発力へ抗する方向へ移動することによって、球体７の係合部位55ａがラジアル（内外）方向へ移動自在な抜き差し可能状態と、に切り換えて、車輪ユニットＹを、被取付部材Ｄに着脱自在に取り付けるように構成している。   In this way, as shown in FIG. 2 and as shown in FIG. 3, when the slide member 52 moves in the direction against the elastic force, the engaging portion 55a of the sphere 7 moves in the radial (inside / outside) direction. The wheel unit Y is configured to be detachably attached to the attached member D by switching to a freely insertable / removable state.

なお、図２の取付状態に於て、被取付部材Ｄから車輪ユニットＹへの荷重や、車輪接地面Ｇの障害物を乗り上げた際の車輪ユニットＹから被取付部材Ｄへの押し上げ力等の力は、差込軸部59の先端面59ｃと、差込孔51ａの底壁部51ｊと、が取付状態に於て当接して受けるように設ける。   2, the load from the mounted member D to the wheel unit Y, the push-up force from the wheel unit Y to the mounted member D when an obstacle on the wheel ground contact surface G is climbed, etc. The force is provided so that the distal end surface 59c of the insertion shaft portion 59 and the bottom wall portion 51j of the insertion hole 51a abut against each other in the attached state.

次に、図５乃至図７を用いて他の実施形態を説明する。なお、主に図１乃至図４の実施形態と異なる構成を説明する。
軸保持部50は、被取付部材Ｄの下部から突設され差込軸部59が差し込まれる差込孔51ａを有する円筒状の筒本体部51と、筒本体部51に上下方向スライド自在に外嵌状に取着された円筒状のスライド部材52と、筒本体部51に取着され凹部59ａと係合する係合部位55ａを有する抜け止め部材55と、を備えている。 Next, another embodiment will be described with reference to FIGS. A configuration different from the embodiment of FIGS. 1 to 4 will be mainly described.
The shaft holding part 50 protrudes from the lower part of the mounted member D and has a cylindrical tube body 51 having an insertion hole 51a into which the insertion shaft part 59 is inserted. A cylindrical slide member 52 attached in a fitting manner, and a retaining member 55 having an engagement portion 55a attached to the tube main body 51 and engaged with the recess 59a are provided.

抜け止め部材55は、筒本体部51の差込孔51ａに内嵌状に取着され差込軸部59が差し込まれる円筒状の筒状部材８から成る。
筒状部材８は、底壁部51ｊの近傍に設けられた（筒本体部51の）内周凹溝51ｈに嵌合する取着用係止凸部84と、弾発付勢部材53によって下方に押圧されたスライド部材52が筒本体部51から脱落するのを防止するために先端部に形成された外面ストッパー凸部86と、先端縁部からアキシャル方向に切り欠いた複数の拡径用スリット82（図７参照）と、拡径用スリット82によって形成され弾性変形可能な複数本の揺動片部81と、揺動片部81からラジアル内方に突設された係合用凸部85（係合用部位85）と、を有している。つまり、抜け止め部材55の係合部位55ａは、揺動片部81に突設された係合用凸部85から成る。 The retaining member 55 is formed of a cylindrical tubular member 8 that is attached to the insertion hole 51a of the tubular body 51 so as to be fitted into the insertion hole 51a and into which the insertion shaft portion 59 is inserted.
The cylindrical member 8 is moved downward by a mounting locking convex portion 84 fitted in the inner circumferential concave groove 51h (of the cylindrical main body portion 51) provided in the vicinity of the bottom wall portion 51j and the elastic biasing member 53. An outer surface stopper convex portion 86 formed at the distal end portion to prevent the pressed slide member 52 from falling off from the cylinder main body portion 51, and a plurality of slits 82 for expanding the diameter cut out in the axial direction from the distal end edge portion. (See FIG. 7), a plurality of elastically deformable swing piece portions 81 formed by the diameter-expanding slits 82, and an engaging convex portion 85 projecting radially inward from the swing piece portion 81 (engagement) And a combined part 85). That is, the engaging portion 55 a of the retaining member 55 is composed of the engaging convex portion 85 protruding from the swing piece portion 81.

図５に於て、スライド部材52は、弾発付勢部材53に弾発付勢され、筒状部材８の外面ストッパー凸部86に押し付けられて移動が規制された状態で、筒状部材８の係合部位55ａが、（筒本体部51及び筒状部材８の）ラジアル外方へ逃げるのを阻止し、凹部59ａと係合部位55ａとの係合状態を保持するための内面凸部52ｅを有している。また、筒状部材８を筒本体部51に内嵌状に装着させる際に、取着用の係止凸部84が内周凹溝51ｈに容易に装着できるように、筒状部材８の基端縁部からアキシャル方向に切り欠いた縮径用スリット83を設けている。   In FIG. 5, the slide member 52 is elastically urged by the elastic urging member 53 and pressed against the outer surface stopper convex portion 86 of the cylindrical member 8, so that the movement of the slide member 52 is restricted. Of the inner surface convex portion 52e for preventing the engagement portion 55a from escaping radially outward (of the cylinder main body 51 and the cylindrical member 8) and maintaining the engagement state between the concave portion 59a and the engagement portion 55a. have. In addition, when the tubular member 8 is attached to the tubular main body 51 in an internally fitted manner, the proximal end of the tubular member 8 is provided so that the attaching locking projection 84 can be easily attached to the inner circumferential groove 51h. A diameter-reducing slit 83 cut out in the axial direction from the edge is provided.

図６に於て、スライド部材52が使用者の手動等の外部操作力によって、弾発付勢部材53の弾発力に抗する方向にスライド移動すると、揺動片部81が揺動自在となり、係合部位55ａが（筒本体部51及び筒状部材８の）ラジアル内外方向へ移動自在となる。つまり、筒状部材８の揺動片部81を、筒本体部51の先端から突出するように設けている。
また、スライド部材52は、拡径状態の複数本の揺動片部81を包囲して、操作者の指等が揺動片部81と揺動片部81の間（拡径用スリット82）に挟まるのを防止する包囲壁部52ｃを有している。また、筒本体部51とスライド部材52と筒状部材８と差込軸部59は、同軸心状に（鉛直状軸心Ｌに軸心を略一致させて）配設されている。なお、軸保持部50の他の構成及び、差込軸部59の構成は、図１乃至図４の実施形態と同様の構成である。 In FIG. 6, when the slide member 52 is slid in a direction against the elastic force of the elastic biasing member 53 by an external operation force such as a manual operation by the user, the rocking piece portion 81 becomes freely swingable. The engaging portion 55a is movable in the radial inward / outward direction (of the cylinder main body 51 and the cylindrical member 8). That is, the swing piece 81 of the cylindrical member 8 is provided so as to protrude from the tip of the cylinder main body 51.
Further, the slide member 52 surrounds the plurality of swing piece portions 81 in the diameter-expanded state, and an operator's finger or the like is between the swing piece portion 81 and the swing piece portion 81 (diameter enlargement slit 82). It has the surrounding wall part 52c which prevents getting caught in. Further, the tube main body 51, the slide member 52, the tube member 8, and the plug-in shaft portion 59 are arranged coaxially (with the axis substantially aligned with the vertical axis L). In addition, the other structure of the axis | shaft holding | maintenance part 50 and the structure of the insertion shaft part 59 are the same structures as embodiment of FIG. 1 thru | or FIG.

次に、他の実施形態の作用（使用方法）について説明する。
図５に示すように、取付状態は、筒本体部51の差込孔51ａに筒状部材８を介して差込軸部59が挿入されている。スライド部材52が、下方へ弾発付勢され、筒状部材８の外面ストッパー凸部86によって下方移動が規制されて、所定位置に配設されている。所定位置のスライド部材52の内面凸部52ｅによって筒状部材８の係合部位55ａがラジアル外方向へ逃げるのを阻止し、係合部位55ａを凹部59ａに係合させて保持して、抜け止めを行なう。 Next, the operation (usage method) of another embodiment will be described.
As shown in FIG. 5, in the attached state, the insertion shaft portion 59 is inserted into the insertion hole 51 a of the tube main body portion 51 via the tubular member 8. The slide member 52 is elastically biased downward, the downward movement is restricted by the outer surface stopper convex portion 86 of the cylindrical member 8, and is arranged at a predetermined position. The inner surface convex portion 52e of the slide member 52 at a predetermined position prevents the engagement portion 55a of the cylindrical member 8 from escaping radially outward, and the engagement portion 55a is engaged with and held by the concave portion 59a to prevent it from coming off. To do.

図５の取付状態から、弾発付勢部材53の弾発力に抗する外部操作力によって、図６に示すように、スライド部材52が上方へスライド移動されると、揺動片部81が揺動自在となり、係合部位55ａがラジアル外方向へ移動自在となる。そして、差込軸部59と軸保持部50の間に外部から引抜き操作力が付与されると、係合部位55ａが、凹部59ａの側壁61を摺接して凹部59ａからスムーズに抜け出し、差込軸部59の外周面59ｄによって、ラジアル外方へ押され、揺動片部81が拡径状に弾性変形し、差込軸部59が引き抜かれる。
その後、外部操作力が解除されると、図７に示すように、スライド部材52は、弾発付勢部材53が下方に弾発付勢し、筒状部材８の外面ストッパー凸部86によって下方への移動が規制されて、所定位置に戻り、筒状部材８は、揺動片部81の弾性的復元力によって、拡径前の状態に戻り、軸保持部50と差込軸部59が離間した取外し状態となる。 When the slide member 52 is slid upward as shown in FIG. 6 by the external operating force against the elastic force of the elastic urging member 53 from the attached state of FIG. It becomes swingable, and the engaging portion 55a is movable outward in the radial direction. When a pulling operation force is applied between the insertion shaft portion 59 and the shaft holding portion 50 from the outside, the engaging portion 55a smoothly slides out of the recess 59a by sliding on the side wall 61 of the recess 59a. The outer peripheral surface 59d of the shaft portion 59 is pushed radially outward, the swinging piece portion 81 is elastically deformed in an expanded shape, and the insertion shaft portion 59 is pulled out.
Thereafter, when the external operating force is released, as shown in FIG. 7, the slide member 52 is urged downward by the elastic urging member 53, and is lowered by the outer surface stopper convex portion 86 of the cylindrical member 8. The cylindrical member 8 returns to the state before the diameter expansion by the elastic restoring force of the swing piece 81, and the shaft holding portion 50 and the insertion shaft portion 59 are moved. It will be in the removed state separated.

また、図７の取外し状態（非取付状態）から、図６に示すように、外部操作力によって、スライド部材52が上方へスライド移動されると、係合部位55ａがラジアル外方向へ移動自在（揺動片部81が揺動自在）となる。差込軸部59と軸保持部50の間に外部から差込操作力が付与されると、係合部位55ａが、差込軸部59のガイドテーパ面59ｂによってラジアル外方へ押され、複数本の揺動片部81が拡径状に弾性変形し、係合部位55ａが外周面59ｄを摺接し、その後、凹部59ａの側壁61に沿って係合部位55ａがスムーズに溝内に落ち込んで係合状態となる。
そして、外部操作力が解除されると、図５に示すように、係合部位55ａがラジアル外方向へ逃げるのを阻止され、係合部位55ａを凹部59ａに係合させた状態が保持された取付状態となる。 Further, as shown in FIG. 6, when the slide member 52 is slid upward from the detached state (non-attached state) of FIG. 7 by an external operation force, the engaging portion 55a is movable outward in the radial direction ( The swing piece 81 is swingable). When an insertion operation force is applied from the outside between the insertion shaft portion 59 and the shaft holding portion 50, the engagement portion 55a is pushed radially outward by the guide taper surface 59b of the insertion shaft portion 59, and a plurality of the engagement portions 55a are pushed. The swinging piece 81 of the book is elastically deformed so as to expand in diameter, the engaging portion 55a slides on the outer peripheral surface 59d, and then the engaging portion 55a smoothly falls into the groove along the side wall 61 of the recess 59a. The engaged state is established.
When the external operating force is released, as shown in FIG. 5, the engagement portion 55a is prevented from escaping outward in the radial direction, and the state in which the engagement portion 55a is engaged with the recess 59a is maintained. Installed state.

このように、図５の取付状態と、図６に示すように、スライド部材52が弾発力へ抗する方向へ移動することによって、係合部位55ａがラジアル（内外）方向へ移動自在な抜き差し可能状態と、に切り換えて、車輪ユニットＹを、被取付部材Ｄに着脱自在に取り付けるように構成している。   Thus, as shown in FIG. 5 and as shown in FIG. 6, when the slide member 52 moves in the direction against the elastic force, the engaging portion 55a can be freely inserted and removed in the radial (inside / outside) direction. Switching to the possible state, the wheel unit Y is configured to be detachably attached to the attached member D.

なお、図５の取付状態に於て、被取付部材Ｄから車輪ユニットＹへの荷重や、車輪接地面Ｇの障害物を乗り上げた際の車輪ユニットＹから被取付部材Ｄへの押し上げ力等の力は、差込軸部59の先端面59ｃと、差込孔51ａの底壁部（奥壁部）51ｊと、が取付状態に於て当接するように設けて、力を受けるようにする。   5, the load from the mounted member D to the wheel unit Y, the pushing force from the wheel unit Y to the mounted member D when an obstacle on the wheel ground contact surface G is climbed, and the like. The force is provided so that the distal end surface 59c of the insertion shaft portion 59 and the bottom wall portion (back wall portion) 51j of the insertion hole 51a are in contact with each other in the attached state so as to receive the force.

なお、本発明は、設計変更可能であって、弾発付勢部材53を省略して、スライド部材52が自重等によって下方位置に配設するように構成しても良い。
なお、本発明に於て、ラジアル外方に開口した凹部59ａとは、図示の外周凹溝型に限らず、窪地（部）型や、差込軸部59をラジアル方向に貫通した貫孔の開口縁部（開口縁近傍部位）から成る底無し凹部も含む。そして、１箇所の係合部位55ａ（1つの球体７や係合用凸部85）に、夫々対応するように、差込軸部59の軸心（鉛直状軸心Ｌ）廻りに等間隔に、複数の、窪地型凹部59ａや貫孔型凹部（底無し型凹部）59ａを設けても良い。
また、凹部59ａの断面形状は、ラジアル外方に向かって溝幅が大きくなるように形成されたコの字状に限らず、半円型、Ｕ字形、Ｖ字形等自由である。
また、説明を容易にするために、車輪11を、水平状の車輪接地面Ｇに載置した場合を基準姿勢とし、車輪接地面Ｇ側を下として、方向を説明している。したがって、方向を基に、使用状態の姿勢を限定するものではない。例えば、車輪接地面Ｇを天井面として、車輪11が天井面を走行する搬送台車や装置に本発明の車輪取付構造を適用した場合は、上述の実施形態の方向の説明は上下逆となる。 In the present invention, the design can be changed, and the elastic urging member 53 may be omitted, and the slide member 52 may be disposed at the lower position by its own weight or the like.
In the present invention, the concave portion 59a that opens radially outward is not limited to the outer peripheral concave groove shape shown in the figure, but is a depression (part) shape or a through hole that penetrates the insertion shaft portion 59 in the radial direction. It also includes a bottomless recess composed of an opening edge (site near the opening edge). In order to correspond to one engaging portion 55a (one sphere 7 or engaging convex portion 85), respectively, around the axis (vertical axis L) of the insertion shaft portion 59 at equal intervals, A plurality of depression-type recesses 59a and through-hole type recesses (bottomless type recesses) 59a may be provided.
The cross-sectional shape of the recess 59a is not limited to the U-shape formed so that the groove width increases radially outward, but may be a semicircular shape, a U shape, a V shape, or the like.
For ease of explanation, the direction is described with the wheel 11 placed on the horizontal wheel contact surface G as a reference posture and the wheel contact surface G side as the bottom. Therefore, the posture in use is not limited based on the direction. For example, when the wheel mounting structure of the present invention is applied to a carriage or device in which the wheel ground contact surface G is a ceiling surface and the wheels 11 travel on the ceiling surface, the description of the direction of the above-described embodiment is upside down.

また、図示省略するが、差込軸部59に、軸心方向に貫通すると共に車輪側（下方）に開口する第１連絡孔を形成して、差込軸部59を中空形状とし、さらに、筒本体部51の底壁部51ｊに、被取付部材Ｄ側外部（上方外部）に連通するための第２連絡孔を形成して、取付状態で第１連絡孔と第２連絡孔を連通するように構成するのが望ましい。
このように形成することで、車輪11近傍にブレーキユニットや車輪発電ユニット等の付設装置を設けた場合に、ブレーキワイヤーや電線等の可撓線材を挿通させることができ、美観に優れると共に、絡まり等の不具合も防止できる。 Although not shown in the drawing, the insertion shaft portion 59 is formed with a first communication hole that penetrates in the axial direction and opens to the wheel side (downward), and the insertion shaft portion 59 has a hollow shape. A second communication hole is formed in the bottom wall portion 51j of the cylinder main body 51 to communicate with the outside (upper external) of the attached member D, and the first communication hole and the second communication hole are communicated in the attached state. It is desirable to configure as follows.
By forming in this way, when an attachment device such as a brake unit or a wheel power generation unit is provided in the vicinity of the wheel 11, a flexible wire material such as a brake wire or an electric wire can be inserted, which is excellent in aesthetics and entangled. Etc. can also be prevented.

なお、本発明に於て、被取付部材Ｄとは、荷物等を搬送するための台車、人を運ぶストレッチャー、移動式作業台等であって、車輪11が回転して人や動物又はモノ等を運搬するものであれば良い。また、図１に於て、車輪ユニットＹは、車輪11が鉛直状軸心Ｌ廻りに旋回可能な（自在式）キャスターであるが、鉛直状軸心Ｌ廻りに旋回不可能なもの（固定式キャスター）とするも良い。また、図示の車輪ユニットＹは、支持部材12に１つの車輪11を枢着したものであるが、複数の車輪11が並列状あるいは直列状に枢着されているものなど、車輪11の個数や配置は自由である。また、差込軸部59を円筒状として軽量化するも良い。   In the present invention, the mounted member D is a carriage for transporting luggage or the like, a stretcher for carrying a person, a movable work table, etc. Anything that transports etc. is acceptable. In FIG. 1, the wheel unit Y is a caster (wheel type) in which the wheel 11 can turn around the vertical axis L, but cannot turn around the vertical axis L (fixed type). Caster). The illustrated wheel unit Y has a single wheel 11 pivotally attached to the support member 12. However, the number of wheels 11 such as a plurality of wheels 11 pivoted in parallel or in series, Arrangement is free. Further, the insertion shaft portion 59 may be cylindrical to reduce the weight.

以上のように、本発明の車輪取付構造は、車輪11を回転自在に支持する支持部材12を有する車輪ユニットＹを、被取付部材Ｄに着脱自在に取着する着脱手段５を備えた車輪取付構造に於て、着脱手段５は、車輪ユニットＹに突設されると共にラジアル外方に開口した凹部59ａを有する差込軸部59と、被取付部材Ｄに設けられ差込軸部59が差し込まれる筒本体部51と、筒本体部51に上下方向スライド自在に外嵌状に取着された筒状のスライド部材52と、筒本体部51に取着され凹部59ａと係合する係合部位55ａを有する抜け止め部材55と、を備え、スライド部材52によって係合部位55ａのラジアル外方向への逃げを阻止して凹部59ａに係合させた取付状態と、スライド部材52の上下方向の移動によって係合部位55ａがラジアル方向へ移動自在な抜き差し可能状態と、に切換えて、車輪ユニットＹを被取付部材Ｄに着脱自在に取り付けるように構成したので、スパナ等の締め付け工具や、特殊な専用工具が必要なく、人の手の力だけで、容易かつ迅速に車輪ユニットＹを被取付部材Ｄに取着することができる。また、被取付部材Ｄから車輪ユニットＹを取り外す際も工具が不要で、車輪11の破損等が発生しても、車輪ユニットＹの交換作業を容易に直ぐ行なうことができる。   As described above, the wheel mounting structure according to the present invention is a wheel mounting provided with the attaching / detaching means 5 for detachably attaching the wheel unit Y having the support member 12 that rotatably supports the wheel 11 to the attached member D. In the structure, the attaching / detaching means 5 is inserted into the insertion shaft portion 59 having a concave portion 59a that protrudes from the wheel unit Y and opens radially outward, and the insertion shaft portion 59 provided in the attached member D. Cylinder body 51, a cylindrical slide member 52 attached to the cylinder body 51 so as to be slidable in the vertical direction, and an engagement portion attached to the cylinder body 51 and engaged with the recess 59a An attachment state in which the slide member 52 is engaged with the recess 59a by preventing the engagement portion 55a from escaping radially outward by the slide member 52, and the slide member 52 moving in the vertical direction. The engagement part 55a can be moved in the radial direction by inserting and removing it. Since the wheel unit Y is detachably attached to the mounted member D, there is no need for a tightening tool such as a spanner or a special dedicated tool, and it is easy with the power of a human hand. And the wheel unit Y can be quickly attached to the member D to be attached. Further, when removing the wheel unit Y from the mounted member D, no tool is required, and even if the wheel 11 is damaged, the replacement operation of the wheel unit Y can be easily performed.

また、抜け止め部材55は、筒本体部51の外周壁部51ｃに設けられた貫孔51ｄに遊嵌状に保持される球体７から成り、係合部位55ａは、球体７が外周壁部51ｃの内面から突出する部位から成るので、球体７が自転しつつ差込軸部59の外周面59ｄに摺接して、差込又は引抜きの際の摩擦抵抗を小さくでき、差込軸部59の抜き差しを小さな力（手動）でスムーズに行なうことができる。着脱操作を何度も繰り返し行なっても磨耗や疲労の蓄積が少なく、耐久性に優れている。   Further, the retaining member 55 is composed of a sphere 7 that is held loosely in a through hole 51d provided in the outer peripheral wall portion 51c of the cylinder main body portion 51. Since the spherical body 7 rotates, the spherical body 7 is slidably contacted with the outer peripheral surface 59d of the insertion shaft portion 59, so that the frictional resistance during insertion or extraction can be reduced. Can be performed smoothly with a small force (manual). Even if the attachment and detachment operations are repeated many times, wear and fatigue are few and the durability is excellent.

また、上記抜け止め部材55は、筒本体部51に取着される筒状部材８から成り、筒状部材８は、拡径用スリット82によって形成された複数本の弾性変形可能な揺動片部81と、揺動片部81からラジアル内方に突設された係合部位55ａと、を有するので、部品点数を少なくでき、容易かつ迅速に組立できる。凹部59ａと係合部位55ａの接触面積を広くでき、ガタつきを抑えて、確実に抜けを防止できる。   The retaining member 55 includes a tubular member 8 attached to the tubular body 51, and the tubular member 8 includes a plurality of elastically deformable swinging pieces formed by the diameter expansion slits 82. Since the portion 81 and the engaging portion 55a projecting radially inward from the swing piece portion 81 are provided, the number of parts can be reduced, and assembly can be performed easily and quickly. The contact area between the concave portion 59a and the engaging portion 55a can be increased, and rattling can be suppressed and the disconnection can be reliably prevented.

５ 着脱手段
７ 球体
８ 筒状部材
11 車輪
12 支持部材
51 筒本体部
51ａ 差込孔
51ｃ 外周壁部
51ｄ 貫孔
51ｊ 奥壁部
52 スライド部材
55 抜け止め部材
55ａ 係合部位
59 差込軸部
59ａ 凹部
59ｃ 先端面
81 揺動片部
82 拡径用スリット
Ｄ 被取付部材
Ｇ 車輪接地面
Ｙ 車輪ユニット 5 Detachment means 7 Sphere 8 Tubular member
11 wheels
12 Support member
51 Tube body
51a insertion hole
51c Outer peripheral wall
51d through hole
51j Back wall
52 Slide member
55 Retaining member
55a Engagement site
59 Insertion shaft
59a recess
59c Tip surface
81 Swing piece
82 Slit for expanding diameter D Mounted member
G wheel contact surface Y wheel unit

Claims (2)

車輪（11）を回転自在に支持する支持部材（12）を有する車輪ユニット（Ｙ）を、被取付部材（Ｄ）に着脱自在に取着する着脱手段（５）を備えた車輪取付構造に於て、
上記着脱手段（５）は、上記車輪ユニット（Ｙ）に突設されると共にラジアル外方に開口した凹部（59ａ）を有する差込軸部（59）と、上記被取付部材（Ｄ）に設けられ該差込軸部（59）が差し込まれる差込孔（51ａ）を有する筒本体部（51）と、該筒本体部（51）に軸方向スライド自在に外嵌状に取着された筒状のスライド部材（52）と、上記筒本体部（51）に取着され上記凹部（59ａ）と係合する係合部位（55ａ）を有する抜け止め部材（55）と、を備え、
上記抜け止め部材（55）は、上記筒本体部（51）の外周壁部（51ｃ）に設けられた貫孔（51ｄ）に遊嵌状に保持される球体（７）から成り、
上記係合部位（55ａ）は、上記球体（７）が上記外周壁部（51ｃ）の内面から突出する部位から成り、
上記スライド部材（52）によって上記係合部位（55ａ）のラジアル外方向への逃げを阻止して上記凹部（59ａ）に係合させた取付状態と、上記スライド部材（52）の軸方向の移動によって上記係合部位（55ａ）がラジアル方向へ移動自在な抜き差し可能状態と、に切換えて、上記車輪ユニット（Ｙ）を上記被取付部材（Ｄ）に着脱自在に取り付けるように構成し、さらに、上記取付状態で、上記差込軸部（59）の先端面（59ｃ）が上記差込孔（51a）の奥壁部（51ｊ）に当接して上記被取付部材（Ｄ）から上記車輪ユニット（Ｙ）への荷重、及び、車輪接地面（Ｇ）の障害物を乗り上げた際の上記車輪ユニット（Ｙ）から上記被取付部材（Ｄ）への押し上げ力を受けるように構成したことを特徴とする車輪取付構造。 In a wheel mounting structure provided with attachment / detachment means (5) for detachably attaching a wheel unit (Y) having a support member (12) for rotatably supporting a wheel (11) to an attached member (D). And
The attachment / detachment means (5) is provided on the insertion shaft (59) having a recess (59a) projecting from the wheel unit (Y) and opening radially outward, and on the attached member (D). A cylinder main body (51) having an insertion hole (51a) into which the insertion shaft (59) is inserted, and a cylinder attached to the cylinder main body (51) so as to be slidable in the axial direction. And a retaining member (55) having an engagement portion (55a) attached to the cylindrical main body (51) and engaged with the recess (59a),
The retaining member (55) is composed of a sphere (7) held loosely in a through hole (51d) provided in the outer peripheral wall portion (51c) of the cylindrical body portion (51),
The engagement part (55a) is composed of a part where the sphere (7) protrudes from the inner surface of the outer peripheral wall part (51c),
An attachment state in which the slide member (52) prevents the engagement portion (55a) from escaping radially outward and engages with the recess (59a), and an axial movement of the slide member (52) The engagement portion (55a) is switched to a removable state in which the engagement portion (55a) is movable in the radial direction, and the wheel unit (Y) is detachably attached to the attachment member (D). in the mounting state, the insertion shaft portion (59) of the distal end surface (59c) is the inner wall portion (51j) in contact with the mounted member (D) from the wheel unit of the insertion hole (51a) It is configured to receive a load on (Y) and a pushing force from the wheel unit (Y) to the mounted member (D) when an obstacle on the wheel ground contact surface (G) is climbed. Wheel mounting structure. 車輪（11）を回転自在に支持する支持部材（12）を有する車輪ユニット（Ｙ）を、被取付部材（Ｄ）に着脱自在に取着する着脱手段（５）を備えた車輪取付構造に於て、
上記着脱手段（５）は、上記車輪ユニット（Ｙ）に突設されると共にラジアル外方に開口した凹部（59ａ）を有する差込軸部（59）と、上記被取付部材（Ｄ）に設けられ該差込軸部（59）が差し込まれる差込孔（51ａ）を有する筒本体部（51）と、該筒本体部（51）に軸方向スライド自在に外嵌状に取着された筒状のスライド部材（52）と、上記筒本体部（51）に取着され上記凹部（59ａ）と係合する係合部位（55ａ）を有する抜け止め部材（55）と、を備え、
上記抜け止め部材（55）は、上記筒本体部（51）に取着される筒状部材（８）から成り、
上記筒状部材（８）は、拡径用スリット（82）によって形成された複数本の弾性変形可能な揺動片部（81）と、該揺動片部（81）からラジアル内方に突設された上記係合部位（55ａ）と、を有し、
上記スライド部材（52）によって上記係合部位（55ａ）のラジアル外方向への逃げを阻止して上記凹部（59ａ）に係合させた取付状態と、上記スライド部材（52）の軸方向の移動によって上記係合部位（55ａ）がラジアル方向へ移動自在な抜き差し可能状態と、に切換えて、上記車輪ユニット（Ｙ）を上記被取付部材（Ｄ）に着脱自在に取り付けるように構成し、さらに、上記取付状態で、上記差込軸部（59）の先端面（59ｃ）が上記差込孔（51a）の奥壁部（51ｊ）に当接して上記被取付部材（Ｄ）から上記車輪ユニット（Ｙ）への荷重、及び、車輪接地面（Ｇ）の障害物を乗り上げた際の上記車輪ユニット（Ｙ）から上記被取付部材（Ｄ）への押し上げ力を受けるように構成したことを特徴とする車輪取付構造。 In a wheel mounting structure provided with attachment / detachment means (5) for detachably attaching a wheel unit (Y) having a support member (12) for rotatably supporting a wheel (11) to an attached member (D). And
The attachment / detachment means (5) is provided on the insertion shaft (59) having a recess (59a) projecting from the wheel unit (Y) and opening radially outward, and on the attached member (D). A cylinder main body (51) having an insertion hole (51a) into which the insertion shaft (59) is inserted, and a cylinder attached to the cylinder main body (51) so as to be slidable in the axial direction. And a retaining member (55) having an engagement portion (55a) attached to the cylindrical main body (51) and engaged with the recess (59a),
The retaining member (55) comprises a tubular member (8) attached to the tubular body (51),
The cylindrical member (8) includes a plurality of elastically deformable swinging piece portions (81) formed by the diameter-enlarging slit (82), and projecting radially inward from the swinging piece portion (81). The engagement portion (55a) provided,
An attachment state in which the slide member (52) prevents the engagement portion (55a) from escaping radially outward and engages with the recess (59a), and an axial movement of the slide member (52) The engagement portion (55a) is switched to a removable state in which the engagement portion (55a) is movable in the radial direction, and the wheel unit (Y) is detachably attached to the attachment member (D). in the mounting state, the insertion shaft portion (59) of the distal end surface (59c) is the inner wall portion (51j) in contact with the mounted member (D) from the wheel unit of the insertion hole (51a) It is configured to receive a load on (Y) and a pushing force from the wheel unit (Y) to the mounted member (D) when an obstacle on the wheel ground contact surface (G) is climbed. Wheel mounting structure.

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