JP2009160999A

JP2009160999A - Furniture with caster

Info

Publication number: JP2009160999A
Application number: JP2007340964A
Authority: JP
Inventors: Takachika Nishizawa; 崇爾西澤
Original assignee: Itoki Corp
Current assignee: Itoki Corp
Priority date: 2007-12-28
Filing date: 2007-12-28
Publication date: 2009-07-23
Anticipated expiration: 2027-12-28
Also published as: JP5373280B2

Abstract

<P>PROBLEM TO BE SOLVED: To improve visibility and operability when locking/unlocking casters, in furniture having the casters with a lock mechanism. <P>SOLUTION: An operation means 5 has an outer casing 64, a push button 75, and a pair of second operation members 66. The push button 75 changes over to lowering and lifting positions alternately by pushing movement, and the second operation member 66, being interlocked with this button, is changed over to advancing and retreating states alternately. The lock mechanism of the caster has a first operation member 20, which moves horizontally with the second operation member 66. The forward and rearward movement of the first operation member 20 changes over the casters to a locked state and a free state. Only the push button 75 of the operation means 5 is exposed outside, so that it is excellent in appearance and the push type ensures reliable operations. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本願発明はキャスタ付き家具に関するものであり、より詳しくは、ロック機構を備えてキャスタが取り付けられている家具に関するものである。 The present invention relates to furniture with casters, and more particularly to furniture with casters attached with a lock mechanism.

オフィス用や会議室用等のテーブルは一般に天板を左右の脚装置で支持した構造になっており、脚装置は、床に沿って略水平状に延びる前後長手の脚ベースから脚支柱部を上向きに突設している略Ｌ字状又は逆Ｔ字状の形態になっていることが多い。そして、例えば会議室用のテーブルは移動させることが多く、そこで脚装置の脚ベースにキャスタを設けていることが多い。 Tables for offices and conference rooms generally have a structure in which the top plate is supported by left and right leg devices, and the leg devices have leg support portions extending from the front and rear leg bases extending substantially horizontally along the floor. It is often in the form of a substantially L shape or an inverted T shape projecting upward. For example, a table for a conference room is often moved, and a caster is often provided on the leg base of the leg device.

テーブルには使用中に様々の理由でこれを水平方向に動かそうとする外力がかかるものであり、そこで、使用中にテーブルが動かないようにキャスタにロック機構（ロック装置）を設けることが行われている。ロック機構は一般に車輪の回転と水平旋回とを同時にロック及びロック解除するようになっている。 The table is subjected to an external force to move it horizontally for various reasons during use. Therefore, a lock mechanism (locking device) is provided on the caster to prevent the table from moving during use. It has been broken. Generally, the lock mechanism is designed to lock and unlock the rotation of the wheel and the horizontal turning at the same time.

ロック機構と対で操作手段を設ける必要があり、この場合は、テーブルでは脚ベースの前端部と後端部との両方にキャスタを設けているため、操作手段は、一つの操作で前後のキャスタをロック状態とフリー状態（ロック解除状態）とに切り替えできるように配慮されている。 It is necessary to provide operation means in pairs with the lock mechanism. In this case, since the table is provided with casters at both the front end and the rear end of the leg base, the operation means can be operated by a single operation. Is considered to be able to switch between a locked state and a free state (unlocked state).

その例として、特許文献１には水平旋回する軸によって駆動される３本のリンク杆から成るリンク機構によって前後キャスタのロック機構を同時に操作することが開示されており、特許文献２には、脚ベースの内部に１本の板部材を前後動自在に配置して、前後回動式のペダル部材によって北部材を前後動させることで前後のロック機構を同時に操作することが開示されており、更に特許文献３には、脚ベースの内部に特許文献１と同様のリンク機構を配置する一方、天板の下面部には回動式のレバーを設けて、チューブ内にワイヤーを摺動自在に挿入している索道管を使用してレバーの動きをリンクの動きに変換する、という構成が開示されている。
特開平１１−３３４３０３号公報特開２００６−９６３２７号公報特開２００７−２６０１５６号公報 As an example, Patent Document 1 discloses that a locking mechanism for front and rear casters is simultaneously operated by a link mechanism composed of three link rods driven by a horizontally swiveling shaft. It is disclosed that a single plate member is arranged in the base so as to be movable back and forth, and the front and rear locking mechanisms are operated simultaneously by moving the north member back and forth by a forward and backward pivoting pedal member. In Patent Literature 3, a link mechanism similar to that in Patent Literature 1 is arranged inside the leg base, while a rotating lever is provided on the lower surface portion of the top plate, and a wire is slidably inserted into the tube. A configuration is disclosed in which the movement of the lever is converted into the movement of the link by using a cableway pipe.
JP-A-11-334303 JP 2006-96327 A JP 2007-260156 A

キャスタをロックしたりロック解除したりする場合、操作手段は使用者の目に触れやすい場所にあって（視認性が良くて）しかも操作は簡単である（操作性が良い）ことが好ましい。そして、特許文献２のように操作手段を脚装置の脚ベースに設けるのは視認性に優れている。しかし、特許文献２ではペダル部材に対して前後方向の力を加えなければらならないため、必ずしも操作性に優れているととは言えない。 When the caster is locked or unlocked, it is preferable that the operation means be in a place where the user can easily touch the eyes (good visibility) and the operation is simple (good operability). And it is excellent in visibility to provide an operation means in the leg base of a leg apparatus like patent document 2. FIG. However, in Patent Document 2, it is not necessarily excellent in operability because a force in the front-rear direction must be applied to the pedal member.

特に、ペダル部材は脚ベースに設けていることから人は足（靴）でペダル部材を踏むことが殆どであるが、手の指で回動操作する場合に比べて足で操作する場合は感触がないため操作しにくくて、脚ベースの上面を靴で何回も擦るような動作をせねばならない場合がある。特に、ペダル部材を手前に回動させるのは靴が滑りやすいためがペダル部材が引っ掛かりにくい傾向がある。また、脚ベースの上面が靴についた泥で汚れやすいという問題も生じる。 In particular, since the pedal member is provided on the leg base, most people step on the pedal member with their feet (shoes), but feel more when they are operated with their feet than when they are operated with their fingers. There are cases where it is difficult to operate and there is a case where the upper surface of the leg base has to be rubbed several times with shoes. In particular, when the pedal member is rotated forward, the shoes are apt to slip, but the pedal member tends not to be caught. There is also a problem that the upper surface of the leg base tends to get dirty with mud on the shoes.

更に、特許文献２では１本の板部材で前後のロック機構を同時にロック・ロック解除するものであるため、前後のロック機構は、板部材の前進動によってロックするものと板部材の後退動によってロックするものとの２種類を用意せねばならず、このため製造や管理に手間がかかるという問題もあった。 Further, in Patent Document 2, since the front and rear locking mechanisms are simultaneously locked and unlocked by one plate member, the front and rear locking mechanisms are locked by the forward movement of the plate member and the backward movement of the plate member. There is a problem that it takes a lot of time for manufacturing and management because it is necessary to prepare two types to be locked.

本願発明はこのような現状る鑑み成されたものであり、脚ベースに操作手段を設ける点は特許文献２を踏襲しつつ、操作性を向上させる等の改良された構成を提供せんとするものである。 The present invention has been made in view of such a current situation, and the point that the operating means is provided on the leg base is to provide an improved configuration such as improving operability while following Patent Document 2. It is.

本願発明の家具は、床に沿って略水平状に延びる脚ベースを備えており、前記脚ベースの前後両端部には旋回部材に車輪を取り付けて成るキャスタが設けられており、更に、前記脚ベースの前後キャスタのうち両方又は片方には、車輪の回転と旋回部材の水平旋回とのうち何れか一方又は両方をロックするロック機構が設けられており、更に、前記脚ベースには前記キャスタのロック機構をロック状態とフリー状態とに切り替えるための操作手段が設けられている、という基本構成になっている。 The furniture of the present invention includes a leg base extending substantially horizontally along the floor, and casters formed by attaching wheels to swiveling members are provided at both front and rear ends of the leg base. Both or one of the front and rear casters of the base is provided with a lock mechanism that locks either or both of the rotation of the wheel and the horizontal rotation of the swivel member, and the leg base further includes a lock mechanism. The basic configuration is such that operation means for switching the lock mechanism between a locked state and a free state is provided.

そして、請求項１では、上記基本構成において、前記ロック機構は、脚ベースの長手方向に沿って水平方向に往復動する第１作動部材を備えている一方、前記操作手段は、下向きプッシュ操作によって下降位置と上昇位置とが交互に切り替わる昇降体と、前記昇降体が下降位置と上昇位置とに交互に切り替わることに連動して脚ベースの長手方向に向かって前進した状態と後退した状態とに交互に切り替わる第２作動部材とを有しており、前記第１作動部材と第２作動部材とを直接に又はジョイントを介して連結している。 In the first aspect of the present invention, in the above basic configuration, the lock mechanism includes a first actuating member that reciprocates in the horizontal direction along the longitudinal direction of the leg base, while the operating means is operated by a downward push operation. A lifting body in which the lowering position and the rising position are switched alternately, and a state in which the lifting body is advanced in the longitudinal direction of the leg base and a state in which it is retracted in conjunction with the alternate switching between the lowering position and the rising position. A second actuating member that switches alternately, and the first actuating member and the second actuating member are connected directly or via a joint.

本願発明は更に請求項２，３に明示するように多くの構成を含んでいる。このうち請求項２の発明は、請求項１において、前記第１作動部材と第２作動部材とには、当該両作動部材を直接に連結するための直接連結手段とジョイントを連結する間接連結手段とが設けられており、更に前記操作手段は前向きの第２作動部材と後ろ向きの第２作動部材との前後２つの第２作動部材を備えており、前後２つの第２作動部材は昇降体に連動して互いに逆方向に移動するように設定されている。 The present invention further includes a number of configurations as specified in claims 2 and 3. Of these, the invention according to claim 2 is the invention according to claim 1, wherein in the first operating member and the second operating member, a direct connecting means for directly connecting the two operating members and an indirect connecting means for connecting a joint. The operating means further includes two second operating members, a front-facing second actuating member and a rear-facing second actuating member, and the two front and rear second actuating members are provided on the lifting body. It is set to move in the opposite direction in conjunction with each other.

また、請求項３の発明は、請求項１又は２において、前記脚ベースは下向きに開口した略樋状に形成されている一方、前記操作手段は昇降体が上下動可能に装着されたケースを備えており、前記昇降体はケースから上向きに突出したボタンを有しており、操作手段は、前記ボタンのみが脚ベースの上方に露出するように脚ベースに下方から嵌め込み装着されており、更に、前記第２作動部材は上向き動させての嵌め込みによって第１作動部材に連結されている。 According to a third aspect of the present invention, in the first or second aspect, the leg base is formed in a substantially bowl-like shape that opens downward, and the operating means is a case in which a lifting body is mounted so as to be movable up and down. The lifting body has a button protruding upward from the case, and the operating means is fitted and attached to the leg base from below so that only the button is exposed above the leg base. The second actuating member is connected to the first actuating member by fitting upwardly.

本願発明は操作体はロックもロック解除もプッシュ操作によって行うものであるため、手による操作は勿論のうちこと足による操作であっても、ワンタッチで確実にロック・ロック解除の操作を行える。このため操作手段は視認性と操作性とに優れていて使い勝手を格段に向上させることができる。 In the present invention, since the operating body is locked and unlocked by a push operation, a lock / unlock operation can be surely performed with a single touch even with a foot operation. For this reason, the operation means is excellent in visibility and operability, and the usability can be remarkably improved.

請求項２のように、操作手段における昇降体は扱い易さやデザイン等に応じて配置位置に希望がある場合があるが、請求項２のように構成すると、ジョイントを使用する態様や使用しない態様、或いは、ジョイントの長さを任意に設定すると言ったことにより、昇降体は希望に応じた位置に配置できる。このためデザイン等の要請に的確に応えることができると共に、脚ベースの長さが相違する各種の家具についてもジョイントの長さを変えるだけで簡単に対応することができる。 As in claim 2, there is a case where the lifting body in the operation means may be desired in the arrangement position depending on ease of handling, design, etc. However, when configured as in claim 2, an aspect in which the joint is used or an aspect in which the joint is not used Alternatively, by saying that the length of the joint is arbitrarily set, the lifting body can be arranged at a position as desired. For this reason, it is possible to accurately meet the demands of design and the like, and it is possible to easily cope with various types of furniture having different leg base lengths simply by changing the joint length.

また、請求項２では操作手段における前後の第２操作手段は昇降体に連動して逆方向に移動するため、前後のキャスタにおいてロック機構は共通した構成で良く、このため家具全体として部材を共通化できてコストダウンや部材管理の手間抑制に貢献できる。 Further, in claim 2, since the second operating means before and after the operating means move in the opposite direction in conjunction with the lifting body, the locking mechanism may be common in the front and rear casters, and therefore the furniture is the same as the whole furniture. Can contribute to cost reduction and labor control of material management.

操作手段は脚ベースに対して上方から嵌め込む方式とすることも可能であるが、この場合は、落下防止のために操作手段（の外ケース）には脚ベースの上面に当たるフランジを設ける必要があり、このため美観が悪化する虞がある。また、脚ベースに空ける穴は強度低下防止のためできるだけ小さくする必要があり、また、ロック機構との連結も面倒である。 The operating means can be fitted to the leg base from above, but in this case, the operating means (outer case) needs to be provided with a flange that hits the upper surface of the leg base to prevent dropping. For this reason, the aesthetics may be deteriorated. Further, the hole formed in the leg base needs to be made as small as possible to prevent the strength from being lowered, and the connection with the lock mechanism is troublesome.

これに対して請求項３の構成を採用すると、脚ベースから上向きに突出するとボタンのみであるため美観に優れており、また、操作手段は予め第２操作手段を組み込んだ状態で脚ベースに装着できるため、家具の組立が面倒になることも防止できる。 On the other hand, if the structure of claim 3 is adopted, it is excellent in aesthetics because only the button protrudes upward from the leg base, and the operation means is mounted on the leg base in a state in which the second operation means is previously incorporated. This makes it possible to prevent the assembly of furniture from being troublesome.

次に、本願発明の実施形態を図面に基づいて説明する。本実施形態は折り畳み式等のテーブルに適用している。 Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to a folding table or the like.

(1).概要
まず、概要を説明する。図１のうち（Ａ）は折り畳み式テーブルの側面図、（Ｂ）は部分的な分離側面図である。折り畳み式テーブル１は、図示しない横長フレームで連結された左右の脚装置２と、跳ね上げ式の天板３を備えている。 (1). Outline First, the outline will be explained. 1A is a side view of a folding table, and FIG. 1B is a partially separated side view. The foldable table 1 includes left and right leg devices 2 connected by a horizontally long frame (not shown) and a flip-up top plate 3.

脚装置２は、床に沿って略前後方向に延びる脚ベース２ａとこの脚ベース２ａの後端部から傾斜姿勢で立ち上がった脚支柱２ｂとで側面視略Ｌ形の形状になっており、脚ベース２ａの前後両端部に本実施形態のキャスタ４を取付けている。脚ベース２ａの前端部と後端部との下面部は、下向きに開口した切欠き部になっている（切欠き部を符号２ｃで示す。）。脚２はその全体がアルミダイキャストのような金属成形品から成っている。 The leg device 2 has a leg base 2a extending substantially in the front-rear direction along the floor and a leg support 2b rising in an inclined posture from the rear end of the leg base 2a. The casters 4 of this embodiment are attached to both front and rear ends of the base 2a. The lower surface portion of the front end portion and the rear end portion of the leg base 2a is a notched portion that opens downward (the notched portion is denoted by reference numeral 2c). The entire leg 2 is made of a metal molded product such as an aluminum die cast.

なお、脚ベース２ａは前端から後端に向けて緩く傾斜しているが、このような姿勢も「水平状」の概念に含まれる。また、本願において脚に関して使用する「前後」は、脚ベース２ａの長手方向を向いた状態での前・後という意味で便宜的に使用しており、厳密な意味での前後ではない（正確には、脚ベース２ａの両端のうちいずれか一方が前で他方が後である、と定義できる。）。また、以下の説明て正面視用語を使用する場合もあるが、これは脚ベース２ａの長手方向を向いた状態を基準にしている。 The leg base 2a is gently inclined from the front end toward the rear end, and such a posture is also included in the concept of “horizontal”. In addition, the term “front and back” used for the legs in the present application is used for the purpose of front and rear in the state of facing the longitudinal direction of the leg base 2a, and is not a front and rear in a strict sense (exactly Can be defined as either one of the ends of the leg base 2a being front and the other being rear). Moreover, although the following description may use the term of front view, this is based on the state which faced the longitudinal direction of the leg base 2a.

折り畳み式テーブル１における脚２の脚ベース２ａは下向きに開口した樋状（チャンネル状）になっており、脚ベース２ａのうち前後キャスタ４の間の適当な位置には操作手段５を設けている。詳細は後述するが、操作ボタン６を繰り返し押すとキャスタ４はロック状態とフリー状態（ロック解除状態）とに交互に切り替わる。 The leg base 2a of the leg 2 in the foldable table 1 has a bowl shape (channel shape) opened downward, and an operating means 5 is provided at an appropriate position between the front and rear casters 4 in the leg base 2a. . Although details will be described later, when the operation button 6 is repeatedly pressed, the caster 4 is alternately switched between a locked state and a free state (unlocked state).

次に、キャスタ４の詳細を図２〜図１１も参照して説明する。図２はキャスタ４の構成部材をほぼ網羅した分離斜視図、図３のうち（Ａ）はフリー状態（ロック解除状態）での要部の縦断側面図、（Ｂ）は（Ａ）の部分的な拡大図、図４のうち（Ａ）はロック状態での縦断側面図、（Ｂ）はアジャスト部材の斜視図である。まず、これらの図に基づいてキャスタ４の概要を説明する。 Next, details of the caster 4 will be described with reference to FIGS. 2 is an exploded perspective view that almost covers the components of the caster 4, FIG. 3A is a longitudinal side view of the main part in a free state (unlocked state), and FIG. 2B is a partial view of FIG. 4A is a longitudinal sectional side view in a locked state, and FIG. 4B is a perspective view of an adjusting member. First, the outline | summary of the caster 4 is demonstrated based on these figures.

キャスタ４を構成する部材は、動きを担保するための基本部材と、ロック機構を構成するロック部材とに大別される。これらの部材は図２〜図４にほぼ網羅して表示されている（特に図２参照）。 The members constituting the casters 4 are roughly classified into basic members for ensuring movement and lock members constituting the lock mechanism. These members are displayed almost completely in FIGS. 2 to 4 (see FIG. 2 in particular).

基本部材として、左右一対の車輪８と、この車輪８が車軸９で取付けられている旋回部材１０と、旋回部材１０が水平旋回自在に支持されている昇降支持体１１と、昇降支持体１１を上下動操作するための回転式の筒状アジャスト部材１２と、筒状アジャスト部材１２を脚２の脚ベース２ａに対して回転自在で上下動不能に保持するためのフロントリテーナ１３及びリアリテーナ１４が挙げられる。昇降支持体１１の回転操作によって昇降支持体１１が上下動し、結果として旋回部材１０及び車輪８と脚２との相対高さが変化する。 As a basic member, a pair of left and right wheels 8, a turning member 10 to which the wheels 8 are attached by an axle 9, an elevating support 11 on which the turning member 10 is supported so as to be horizontally rotatable, and an elevating support 11 are provided. A rotary cylindrical adjustment member 12 for operating up and down, and a front retainer 13 and a rear retainer 14 for holding the cylindrical adjustment member 12 so as to be rotatable with respect to the leg base 2a of the leg 2 and not movable up and down. It is done. As the lifting / lowering support 11 rotates, the lifting / lowering support 11 moves up and down, and as a result, the relative heights of the revolving member 10 and the wheels 8 and the legs 2 change.

ロック部材としては、車輪８を回転不能に保持するための車輪ストッパー１５と、車輪ストッパー１５をロック状態に付勢する第１ばね１６と、旋回部材１０を水平旋回不能に保持するための旋回ストッパー１７と、旋回ストッパー１７をロック状態に付勢する第２ばね１８と、車輪ストッパー１５と旋回ストッパー１７とを同時に作動させる上下動方式の第１連動部材１９と、既述した第１作動部材２０と、第１作動部材２０の水平動を第１連動部材１９の上下動に変換する第２連動部材２１と、第２連動部材２１を後退方向に付勢する第３ばね２２とが挙げられる。 As the lock member, a wheel stopper 15 for holding the wheel 8 in a non-rotatable state, a first spring 16 for biasing the wheel stopper 15 in a locked state, and a turning stopper for holding the turning member 10 in a non-rotatable horizontal state. 17, the second spring 18 that urges the turning stopper 17 in the locked state, the first interlocking member 19 of the vertical movement type that simultaneously operates the wheel stopper 15 and the turning stopper 17, and the first operating member 20 described above. And a second interlocking member 21 that converts the horizontal motion of the first actuating member 20 into a vertical motion of the first interlocking member 19, and a third spring 22 that biases the second interlocking member 21 in the backward direction.

第１作動部材２０と第２連動部材２１と第３ばね２２と第１連動部材１９とは、操作ボタン６の動きをロックとロック解除との切り替えに変換するロック機構を構成している。そして、本実施形態では、図３（Ａ）のように第１作動部材２０が前進している状態では、第２連動部材２１によって第１連動部材１９が押し下げられており、この状態では旋回ストッパー１７がフリー位置に後退していて旋回部材１０は水平旋回自在であると共に、車輪ストッパー１５はフリー姿勢になっていて車輪８は転動自在である。 The first actuating member 20, the second interlocking member 21, the third spring 22, and the first interlocking member 19 constitute a lock mechanism that converts the movement of the operation button 6 into switching between locking and unlocking. In the present embodiment, the first interlocking member 19 is pushed down by the second interlocking member 21 in the state where the first actuating member 20 is moving forward as shown in FIG. 17 is retracted to the free position so that the turning member 10 can be turned horizontally, and the wheel stopper 15 is in a free posture so that the wheel 8 can roll.

他方、第１作動部材２０が後退すると、第２連動部材２１が第３ばね２２の付勢力によって後退することで第１連動部材１９が上昇動し、すると、旋回ストッパー１７がロック位置に前進して旋回部材１０は水平旋回不能に保持されると共に、車輪ストッパー１５はロック姿勢になって車輪８は転動不能に保持される。 On the other hand, when the first actuating member 20 is retracted, the second interlocking member 21 is retracted by the urging force of the third spring 22 so that the first interlocking member 19 is moved upward, and then the turning stopper 17 is advanced to the lock position. Thus, the turning member 10 is held so that it cannot turn horizontally, and the wheel stopper 15 is in a locked posture, and the wheel 8 is held so that it cannot roll.

以下、従前の図に加えて図５〜図１２も参照して各部材の具体的な形態と相互関係を説明する。図５は部材を分離した側面図、図６及び図７は断面表示した状態での分離側面図、図８は図３（Ａ）の VIII-VIII視断面図、図９は図３（Ａ）の IX-IX視断面図、図１０は図３（Ａ）の X-X視方向から見た分離平断面図、図１１は図７の XI-XI視断面図、図１２は第１作動部材とリアリテーナとの一部破断分離斜視図である。 Hereinafter, specific forms and mutual relations of each member will be described with reference to FIGS. 5 to 12 in addition to the previous drawings. 5 is a side view with the members separated, FIGS. 6 and 7 are sectional side views in a cross-sectional view, FIG. 8 is a sectional view taken along the line VIII-VIII of FIG. 3A, and FIG. 9 is FIG. IX-IX sectional view, FIG. 10 is a separated plan sectional view as seen from the XX direction of FIG. 3A, FIG. 11 is a sectional view taken along the line XI-XI in FIG. 7, and FIG. 12 is the first actuating member and rear retainer. FIG.

(2).基本構成
まず、昇降支持体１１を説明する。昇降支持体１１は、例えば図５〜７に示すように、外周に雄ねじ（台形ねじ）を形成した雄ねじ部１１ａと、雄ねじ部１１ａの下端に一体に連続した円形のねじ無し部１１ｂと、ねじ無し部１１ｂから下向きに突出した円形のボス部（支軸部）１１ｃとを備えている。ねじ無し部１１ｂと雄ねじ部１１ａの外径より僅かに大径に設定されている。 (2). Basic Configuration First, the lifting support 11 will be described. For example, as shown in FIGS. 5 to 7, the elevating support 11 includes a male screw portion 11 a having a male screw (trapezoidal screw) formed on the outer periphery, a circular unthreaded portion 11 b integrally connected to the lower end of the male screw portion 11 a, a screw And a circular boss portion (support shaft portion) 11c protruding downward from the non-portion 11b. The diameter is set slightly larger than the outer diameter of the unthreaded portion 11b and the male threaded portion 11a.

他方、ボス部１１ｃはねじ無し部１１ｂよりもかなり小径になっており、このため、ねじ無し部１１ｂの下端面は中間段部１１ｄになっている。また、ボス部１１ｃの下端には当該ボス部１１ｃよりも小径の下小径部１１ｅが一体に形成されており、このため、ボス部１１ｃの下端面は下段部１１ｆ（図３（Ｂ）参照）になっている。 On the other hand, the boss portion 11c has a considerably smaller diameter than the unthreaded portion 11b. For this reason, the lower end surface of the unthreaded portion 11b is an intermediate step portion 11d. Further, a lower small diameter portion 11e having a smaller diameter than that of the boss portion 11c is integrally formed at the lower end of the boss portion 11c. Therefore, the lower end surface of the boss portion 11c is a lower step portion 11f (see FIG. 3B). It has become.

図８に示すように、昇降支持体１１における雄ねじ部１１ａの上面には、平面視で将棋の駒に近い形状の回り止め部１１ｇが一体に形成されている。回り止め部１１ｇは脚２の長手方向に長く延びる姿勢になっている。そして、図８に示すように、折り畳み式テーブル１における脚２の脚ベース２ａには下向きのボス部３６が形成されており、この下向きボス部３６に、昇降支持体１１の回り止め部１１ｇが上下動自在で回転不能に嵌合する規制溝２４が形成されている。 As shown in FIG. 8, an anti-rotation portion 11 g having a shape close to a shogi piece in plan view is integrally formed on the upper surface of the male screw portion 11 a in the lifting support 11. The detent 11g is in a posture that extends long in the longitudinal direction of the leg 2. As shown in FIG. 8, a downward boss portion 36 is formed on the leg base 2 a of the leg 2 in the foldable table 1, and the detent portion 11 g of the lifting support 11 is provided on the downward boss portion 36. A regulation groove 24 is formed that can be moved up and down and fitted non-rotatably.

規制溝２４には、脚２の先端に向いた補助溝２４ａが連続形成されており、昇降支持体１１の回り止め部１１ｇに突設した昇降規制ピン２５が補助溝２４ａに嵌まっている。昇降規制ピン２５及び補助溝２４ａは、昇降支持体１１の下降下限位置を規制するものである。なお、回り止め部１１ｇが回転不能に嵌まる固定部材を脚２とは別に構成して、この固定部材を脚２の脚ベース２ａにビスで締結することも可能である。 An auxiliary groove 24a facing the tip of the leg 2 is continuously formed in the restriction groove 24, and a lifting restriction pin 25 protruding from the rotation stopper 11g of the lifting support 11 is fitted in the auxiliary groove 24a. The raising / lowering regulation pin 25 and the auxiliary groove 24a regulate the lower limit position of the raising / lowering support 11. In addition, it is also possible to constitute a fixing member into which the rotation preventing portion 11g is fitted so as not to rotate separately from the leg 2 and fasten the fixing member to the leg base 2a of the leg 2 with a screw.

昇降支持体１１の雄ねじ部１１ａにはアジャスト部材１２が外側から螺合している。従って、アジャスト部材１２の内周は雌ねじ穴２７になっている。また、アジャスト部材１２の上下中途高さ位置には中段フランジ部１２ａが一体に形成されており、中段フランジ部１２ａの外周寄り部位には、当該中段フランジ部１２ａの外径よりもやや小径で下向き筒状の掴持部１２ｂが一体に形成されている。 An adjusting member 12 is screwed into the male screw portion 11a of the lifting support 11 from the outside. Therefore, the inner periphery of the adjustment member 12 is a female screw hole 27. In addition, a middle flange portion 12a is integrally formed at an upper and lower halfway height position of the adjustment member 12, and a portion near the outer periphery of the middle flange portion 12a has a slightly smaller diameter than the outer diameter of the middle flange portion 12a. A cylindrical gripping portion 12b is integrally formed.

掴持部１２ｂの内側は下向きに開口した環状凹所になっており、また、中段フランジ部１２ａと掴持部１２ｂとで請求項に記載したリング体が構成されている。図４（Ｂ）や図１０に示すように、掴持部１２ｂの外周には人の指の引っ掛かりを良くする滑り防止手段の一例として凹み１２ｂ′が適当な間隔で周方向に並び形成されている。図３，４から明らかなように、中段フランジ部１２ａは脚２における脚ベース２ａの切欠き部２ｃに近接している。 The inside of the gripping portion 12b is an annular recess that opens downward, and the intermediate flange portion 12a and the gripping portion 12b constitute the ring body described in the claims. As shown in FIG. 4B and FIG. 10, dents 12b 'are formed on the outer periphery of the gripping portion 12b as an example of anti-slip means for improving the catching of a person's finger in the circumferential direction at appropriate intervals. Yes. As apparent from FIGS. 3 and 4, the middle flange portion 12 a is close to the notch portion 2 c of the leg base 2 a in the leg 2.

アジャスト部材１２の上端部には外向きに張り出した上フランジ部１２ｃが一体に形成されており、このため、上フランジ部１２ｃと中段フランジ部１２ａとの間の部位には外向き開口の環状溝２８が形成されている。そして、環状溝２８の箇所をフロントリテーナ１３とリアリテーナ１４とで前後両側から挟むことにより、アジャスト部材１２は回転自在で上下抜け不能に保持されている（アジャスト部材１２は上方に抜けることはないので、両リテーナ１３，１４では少なくともアジャスト部材１２の下向き離脱を規制すれば足りる。）。 An upper flange portion 12c projecting outward is integrally formed at the upper end portion of the adjusting member 12, and therefore, an annular groove having an outward opening is formed at a portion between the upper flange portion 12c and the middle flange portion 12a. 28 is formed. The adjustment member 12 is held so as to be rotatable and cannot be removed vertically by sandwiching the annular groove 28 between the front retainer 13 and the rear retainer 14 from the front and rear sides (the adjustment member 12 does not escape upward). It is sufficient that at least the retainer 13 and 14 regulate the downward detachment of the adjusting member 12).

例えば図２や図１０に示すように、フロントリテーナ１３は平面視でリングを半割りした形状であり、その内周にはアジャスト部材１２の環状溝２８に半周だけ入り込むフロント内向き突条１３ａが形成されている。フロントリテーナ１３は３本のビス２９で脚２の脚ベース２ａに締結されている。また、フロントリテーナ１３の上面には２本の位置決めピン３０が突設されており、位置決めピン３０は脚２の脚ベース２ａに設けた位置決め穴に嵌まっている。 For example, as shown in FIGS. 2 and 10, the front retainer 13 has a shape in which the ring is divided in half in a plan view, and a front inward protrusion 13 a that enters the annular groove 28 of the adjusting member 12 only a half circumference is formed on the inner circumference. Is formed. The front retainer 13 is fastened to the leg base 2 a of the leg 2 with three screws 29. Further, two positioning pins 30 project from the upper surface of the front retainer 13, and the positioning pins 30 are fitted into positioning holes provided in the leg base 2 a of the leg 2.

図２に明示するように、リアリテーナ１４は脚ベース２ａの長手方向に長い形態でしかも断面形状は台形の上半部と長方形の下半部とを複合した形状になっており、従って、フロントリテーナ１３よりも高さが高いブロック形態になっている。このようにブロック形態になっているのは、その内部に既述の第２連動部材２０を配置しているためである。 As clearly shown in FIG. 2, the rear retainer 14 is long in the longitudinal direction of the leg base 2a, and the cross-sectional shape is a composite of the upper half of the trapezoid and the lower half of the rectangle. The block form is higher than 13. The reason why the block is formed in this way is that the already-described second interlocking member 20 is disposed therein.

リアリテーナ１４の前部にはアジャスト部材１２の半分を抱持するように平面視で半円状の前凹所３１が形成されており、この前凹所３１に、アジャスト部材１２の環状溝２８を半分だけ抱持するリア内向き突条１４ａが形成されている。また、リアリテーナ１４の前部には、フロントリテーナ１３の両端部に重なる左右一対のサイド突起３３と、昇降支持体１１における回り止め部１１ｇの背面に当接又は近接するセンター突起３４とが形成されている。 The front portion of the rear retainer 14 is formed with a semicircular front recess 31 in a plan view so as to hold half of the adjustment member 12, and the annular groove 28 of the adjustment member 12 is formed in the front recess 31. A rear inward ridge 14a that is held in half is formed. In addition, a pair of left and right side protrusions 33 that overlap both ends of the front retainer 13 and a center protrusion 34 that abuts on or is close to the back surface of the rotation stopper 11g in the lifting support 11 are formed on the front portion of the rear retainer 14. ing.

また、図６及び図８に示すように、脚２の脚ベース２ａには、アジャスト部材１２の上端面１２ｄが当接する既述の下向きボス部３６が形成されている。下向きボス部３６は、リアリテーナ１４のセンター突起３４と干渉しないように平面視で後ろ向き開口している。 As shown in FIGS. 6 and 8, the leg base 2a of the leg 2 is formed with the above-described downward boss portion 36 with which the upper end surface 12d of the adjusting member 12 abuts. The downward boss portion 36 opens rearward in plan view so as not to interfere with the center protrusion 34 of the rear retainer 14.

例えば図２に示すように、リアリテーナ１４には、上面と傾斜面とに跨がった座ぐり凹所３７が形成されている一方、図８に示すように脚２の脚ベース２ａには座ぐり凹所３７に嵌合する下向き円柱部３８が一体に形成されており、下向き円柱部３８にねじ込まれたビス３９によってリアリテーナ１４は脚ベース２ａに固定されている。 For example, as shown in FIG. 2, the rear retainer 14 is formed with a counterbore recess 37 straddling the upper surface and the inclined surface, while the leg base 2a of the leg 2 is seated on the leg base 2a as shown in FIG. A downward cylindrical portion 38 fitted into the hollow recess 37 is integrally formed, and the rear retainer 14 is fixed to the leg base 2 a by a screw 39 screwed into the downward cylindrical portion 38.

図３から理解できるように、フロントリテーナ１３を締結するビス２９は平面視でアジャスト部材１２と重なる位置に配置されている一方、リアリテーナ１４を締結するビス３９は平面視でアジャスト部材１２から後方に外れた位置に配置されている。 As can be understood from FIG. 3, the screw 29 for fastening the front retainer 13 is arranged at a position overlapping the adjustment member 12 in a plan view, while the screw 39 for fastening the rear retainer 14 is rearward from the adjustment member 12 in a plan view. It is placed at a position that is off.

図８に示すように、アジャスト部材１２の中段フランジ部１２ａは平面視で半周以上の範囲で脚２の脚ベース２ａの外側に若干の寸法ｅだけはみ出ている。すなわち、中段フランジ部１２ａは、脚ベース２ａの先端面２′とこれに連なる左右側面２ａ″との３つの面の外側にはみ出ている。このように中段フランジ部１２ａをはみ出す、例えばテーブルを壁際に寄せた場合に中段フランジ１２ａが脚ベース２ａの先端に対する保護部材の役割を果たすことになり、このため、脚ベース２ａの先端が壁等に当たって傷付くことを防止できる。 As shown in FIG. 8, the middle flange portion 12 a of the adjusting member 12 protrudes by a slight dimension e outside the leg base 2 a of the leg 2 in a range of more than a half circumference in plan view. That is, the middle flange portion 12a protrudes outside the three surfaces of the front end surface 2 'of the leg base 2a and the left and right side surfaces 2a "connected thereto. In this way, the middle flange portion 12a protrudes, for example, near the wall of the table. The middle flange 12a plays a role of a protection member for the tip of the leg base 2a when it comes close to the top, so that the tip of the leg base 2a can be prevented from hitting a wall or the like and being damaged.

次に、旋回部材１０と車輪８を説明する。旋回部材１０は樹脂の成形品であり、昇降支持体１１のボス部１１ｂに回転自在に嵌まった円形の基部を備えており、基部に平面視長方形の水平状部１０ａを設けている。旋回部材１０の基部には、昇降支持体１１のボス部１１ｂが嵌まるボス穴４１と、昇降支持体１１の下小径部１１ｅが嵌まる下穴５９とが形成されている。 Next, the turning member 10 and the wheel 8 will be described. The swivel member 10 is a resin molded product, and includes a circular base portion that is rotatably fitted to the boss portion 11b of the elevating support 11, and a horizontal portion 10a that is rectangular in plan view is provided at the base portion. A boss hole 41 into which the boss portion 11b of the elevating support body 11 is fitted and a lower hole 59 into which the lower small diameter portion 11e of the elevating support body 11 is fitted are formed at the base of the turning member 10.

ボス穴４１には内向き環状突起４２が形成されて、昇降支持体１１のボス部１１ｃには環状突起４２が嵌まる環状溝４３が形成されており、これら環状突起４２と環状溝４３との嵌まり合いによって昇降支持体１１と旋回部材１０とは抜け不能に保持されている。また、昇降支持体１１のボス部１１ｃと旋回部材１０のボス穴４１との間には若干の隙間を設けており、旋回部材１０と昇降支持体１１との回転の芯決めは昇降支持体１１の下小径部１１ｅと旋回部材１０の下穴５９との嵌合に依っている。 An inward annular protrusion 42 is formed in the boss hole 41, and an annular groove 43 into which the annular protrusion 42 is fitted is formed in the boss portion 11 c of the elevating support 11. The elevating support 11 and the turning member 10 are held so as not to be detached by the fitting. Further, a slight gap is provided between the boss portion 11 c of the lifting support 11 and the boss hole 41 of the turning member 10, and the centering of rotation between the turning member 10 and the lifting support 11 is determined by the lifting support 11. This depends on the fitting of the lower small-diameter portion 11e with the pilot hole 59 of the turning member 10.

また、旋回部材１０の上部は薄肉となってアジャスト部材１２における掴持部１２ｂの下向き環状凹所に入り込んでおり、このため、旋回部材１０の上部には、ボス穴４１よりも大径で昇降支持体１１のねじ無し部１１ｂの外側に広がっている上向き凹所４５が空いており、上向き凹所４５の内周の下端部に昇降支持体１１のねじ無し部１１ａと対向した段部を形成して、この段部に、旋回ロック機構の一環として内側と上方とに開口した旋回用係合溝４６が適宜ピッチで多数形成されている。旋回用係合溝４６は平面視で半径内側に向いて間隔が広がる台形になっている。 Further, the upper part of the turning member 10 is thin and enters the downward annular recess of the gripping part 12b of the adjusting member 12. For this reason, the upper part of the turning member 10 is raised and lowered with a diameter larger than that of the boss hole 41. An upward recess 45 extending outside the unthreaded portion 11 b of the support 11 is vacant, and a stepped portion facing the unthreaded portion 11 a of the lifting support 11 is formed at the lower end of the inner periphery of the upward recess 45. In this step portion, a large number of turning engaging grooves 46 opened inward and upward as part of the turning lock mechanism are formed at an appropriate pitch. The turning engaging groove 46 has a trapezoidal shape in which the interval is widened toward the inside of the radius in plan view.

次に車輪８を説明する。車輪８は旋回部材１０における張り出し部１０ｂの両側に位置しており、１本の車軸９で旋回部材１０に連結されている。車輪の内面には環状凹所４７が形成されており、その内周面に、車輪ロック機構の一環として回転中心に向いて車輪用係合溝４８が一定ピッチで多数形成されている。図１１では車輪８の外周面にＯリング４９を嵌め入れている。 Next, the wheel 8 will be described. The wheels 8 are located on both sides of the overhanging portion 10 b of the turning member 10, and are connected to the turning member 10 by one axle 9. An annular recess 47 is formed on the inner surface of the wheel, and a large number of wheel engagement grooves 48 are formed on the inner peripheral surface at a constant pitch toward the center of rotation as part of the wheel lock mechanism. In FIG. 11, an O-ring 49 is fitted on the outer peripheral surface of the wheel 8.

(3).ロック機構
次に、ロック機構を説明する。まず、車輪ロック機構を説明する。車輪ロック機構は車輪ストッパー１５と車輪用係合溝４８と第１ばね１６とで構成されている。車輪ストッパー１５は樹脂の成形品であり、旋回部材１０の下面部でかつ左右車輪８の間に配置されている。そして、左右車輪８の間の中間部において車軸９と直交した方向に延びるシーソー部１５ａと、シーソー部１５ａの前部に一体に設けた羽根部１５ｂとを備えており、このため全体的には平面視Ｔ形の形態になっている（勿論他の形態でもよい）。 (3). Locking mechanism Next, the locking mechanism will be described. First, the wheel lock mechanism will be described. The wheel lock mechanism includes a wheel stopper 15, a wheel engagement groove 48, and a first spring 16. The wheel stopper 15 is a molded product of resin, and is disposed on the lower surface portion of the turning member 10 and between the left and right wheels 8. In addition, a seesaw portion 15a extending in a direction orthogonal to the axle 9 at the intermediate portion between the left and right wheels 8 and a blade portion 15b provided integrally with the front portion of the seesaw portion 15a are provided. It has a T-shaped form in plan view (of course, other forms may be used).

そして、図２や図１１に示すように、シーソー部１５ａのうち羽根部１５ｂのやや奥側の部位に左右の支軸５０を横向き突設する一方、旋回部材１０には、前記支軸５０が下方からの強制的嵌め込みによって嵌まり込む上向き開口の軸受け部５１を一体に設けている。また、シーソー部１５ａの先端は旋回部材１０の下穴５９の下方に位置している一方、羽根部１５ｂの左右端部は車輪８の環状凹所４７に入り込んでおり、左右羽根部１５ｂの先端部に、車輪用係合溝４８に嵌脱する係合突起５２を形成している。 As shown in FIG. 2 and FIG. 11, the left and right support shafts 50 are laterally projected from the seesaw portion 15 a on the slightly rear side of the blade portion 15 b, while the swivel member 10 includes the support shaft 50. A bearing portion 51 having an upward opening that is fitted by forced fitting from below is provided integrally. Further, the tip of the seesaw portion 15a is located below the pilot hole 59 of the turning member 10, while the left and right ends of the blade portion 15b enter the annular recess 47 of the wheel 8, and the tips of the left and right blade portions 15b. An engaging protrusion 52 that fits into and disengages from the wheel engaging groove 48 is formed in the portion.

羽根部１５ｂの左右中間部と旋回部材１０との間には既述の第１ばね１６が介在しており、このため、車輪ストッパー１５は、その係合突起５２が車輪用係合溝４８に嵌合する方向に回動し勝手となるように付勢されている。旋回部材１０には第１ばね１６が嵌まるばね受け穴５３が形成されている。 The first spring 16 described above is interposed between the left and right intermediate portion of the blade portion 15b and the turning member 10, and therefore, the wheel stopper 15 has its engagement protrusion 52 formed in the wheel engagement groove 48. It is urged so that it rotates in the direction of fitting and becomes selfish. A spring receiving hole 53 into which the first spring 16 is fitted is formed in the turning member 10.

図１１に示すように、旋回部材１０における左右の軸受け部５１は互いに分離しており、また、軸受け部５１の下面には支軸５０の誘い込みのための傾斜面を形成している。また、車輪ストッパー１５のシーソー部１５ａのうち支軸５０を設けている部分には、支軸５０の嵌め込みに際して弾性変形して左右支軸５０の間隔が狭まるように上下開口の穴５４を空けている。 As shown in FIG. 11, the left and right bearing portions 51 in the turning member 10 are separated from each other, and an inclined surface for guiding the support shaft 50 is formed on the lower surface of the bearing portion 51. Further, a portion of the seesaw portion 15a of the wheel stopper 15 provided with the support shaft 50 is provided with a hole 54 having an upper and lower opening so that the support shaft 50 is elastically deformed when the support shaft 50 is fitted and the interval between the left and right support shafts 50 is reduced. Yes.

次に、旋回ロックを説明する。旋回ロック機構は既述のとおり旋回ストッパー１７と旋回用係合溝４６と第２ばね１８とで構成されている。旋回ストッパー１７は例えば図２から理解できるように基本的に上下厚さよりも平面視での幅が大きい板状であり、図９に示すように、旋回ストッパー１７は昇降支持体１１のねじ無し部１１ｂに設けたガイド穴５６に水平動自在に嵌まっており、先端には旋回用係合溝４６に嵌脱する平面視台形の嵌合部１７ａが形成されている。 Next, the turning lock will be described. As described above, the turning lock mechanism includes the turning stopper 17, the turning engagement groove 46, and the second spring 18. For example, as can be understood from FIG. 2, the turning stopper 17 is basically a plate having a width larger in plan view than the thickness of the upper and lower sides. As shown in FIG. 9, the turning stopper 17 is an unthreaded portion of the lifting support 11. It fits in a guide hole 56 provided in 11b so as to be horizontally movable, and a trapezoidal fitting portion 17a in a plan view that fits in and out of the turning engaging groove 46 is formed at the tip.

旋回ストッパー１７は、脚２の脚ベース２ａの長手方向と同じ方向に延びるように配置されている。また、旋回ストッパー１７は係合部１７ａと反対側に延びる小径軸１７ｂを備えており、小径軸１７ｂは昇降支持体１１に設けた補助ガイド５６ａに嵌まっている。 The turning stopper 17 is disposed so as to extend in the same direction as the longitudinal direction of the leg base 2 a of the leg 2. The turning stopper 17 includes a small-diameter shaft 17b extending on the opposite side of the engaging portion 17a. The small-diameter shaft 17b is fitted into an auxiliary guide 56a provided on the lifting support 11.

そして、小径軸１７ｂに第２ばね１８を被嵌している。従って、旋回ストッパー１７は第２ばね１８によって旋回用係合溝４６に嵌まる方向に付勢されている。また、旋回ストッパー１７の先端部と旋回用係合溝４６とが平面視で台形であるため、両者が嵌合した状態で旋回部材１０に対して過度に大きな旋回モーメントが作用すると、傾斜面のガイド作用によって旋回ストッパー１７が旋回用係合溝４６から逃げ移動し得る。旋回ストッパー１７のうち小径軸１７ｂに近い箇所には、平面視略矩形の操作穴５７が上下に開口している。 The second spring 18 is fitted on the small diameter shaft 17b. Therefore, the turning stopper 17 is biased by the second spring 18 in a direction in which the turning stopper 17 is fitted into the turning engagement groove 46. Further, since the distal end portion of the turning stopper 17 and the turning engaging groove 46 are trapezoidal in plan view, if an excessively large turning moment acts on the turning member 10 in a state where both are fitted, the inclined surface The turning stopper 17 can move away from the turning engaging groove 46 by the guide action. An operation hole 57 having a substantially rectangular shape in plan view is opened up and down at a location near the small-diameter shaft 17 b in the turning stopper 17.

昇降支持体１１は上下に貫通する操作穴５７が空いていて中空状になっており、縦穴に既述の第１連動部材１９が上下動可能な状態で嵌まっている。図２から理解できるように第１連動部材１９は基本的には板状であり、このため昇降支持体１１には回転不能に嵌まっている。そして、第１連動部材１９は、旋回ストッパー１７の長手方向に幅が広がる広巾部１９ａと、広巾部１９ａの上方に位置した細幅部１９ｂと、細幅部１９ｂの上端に一体に設けた主動ピン部１９ｃと、広巾部１９ａの下端に下向き突設した従動ピン部１９ｄとを備えている。 The elevating support 11 is hollow with an operation hole 57 penetrating vertically, and the above-described first interlocking member 19 is fitted in the vertical hole in a state where it can move up and down. As can be understood from FIG. 2, the first interlocking member 19 is basically plate-like, and is thus fitted to the elevating support 11 so as not to rotate. And the 1st interlocking member 19 is the main drive integrally provided in the upper end of the wide part 19a widened in the longitudinal direction of the rotation stopper 17, the narrow part 19b located above the wide part 19a, and the narrow part 19b. A pin portion 19c and a driven pin portion 19d projecting downward from the lower end of the wide width portion 19a are provided.

広巾部１９ａはおおむね昇降支持体１１のボス部１１ｃの箇所に位置しており、旋回ストッパー１７の長手方向に幅が広がっている。そして、第１連動部材１９の広巾部１９ａと細幅部１９ｂとは、上傾斜面１９ｅと下傾斜面１９ｆとがくの字状に連続したくびれ部１９ｇを介して連続しており、くびれ部１９ｇが旋回ストッパー１７の操作穴５７に挿通している。くびれ部１９ｇのうち上傾斜面１９ｅと反対側の部分は上傾斜面１９ｅと平行な補助傾斜面１９ｈになっており、このため、細幅部１９ｂは広巾部１９ａの前後端面に対して共に段落ちした状態になっている。 The wide width portion 19 a is generally located at the position of the boss portion 11 c of the elevating support 11, and the width is widened in the longitudinal direction of the turning stopper 17. And the wide part 19a and the narrow part 19b of the 1st interlocking member 19 are continuing via the constricted part 19g which followed the upper inclined surface 19e and the lower inclined surface 19f in the shape of a letter-shape, and the constricted part 19g Is inserted into the operation hole 57 of the turning stopper 17. The portion of the constricted portion 19g opposite to the upper inclined surface 19e is an auxiliary inclined surface 19h parallel to the upper inclined surface 19e. Therefore, the narrow portion 19b is stepped with respect to the front and rear end surfaces of the wide portion 19a. It has fallen.

旋回部材１０には第１連動部材１９の従動ピン部１９ｄがスライド自在に嵌まる穴５９が空いており、第１連動部材１９が下降動すると従動ピン部１９ｄはその下部が穴５９の下方に突出し、第１連動部材１９が上昇すると従動ピン部１９ｄは穴５９に隠れる。 The swivel member 10 has a hole 59 in which the driven pin portion 19d of the first interlocking member 19 is slidably fitted. When the first interlocking member 19 moves downward, the lower portion of the driven pin portion 19d is below the hole 59. When the first interlocking member 19 protrudes, the driven pin portion 19d is hidden in the hole 59.

昇降支持体１１の回り止め部１１ｇにはリアリテーナ１４に向いて開口した断面略角形の上ガイド穴６０が空いており、この上ガイド穴６０に第２連動部材２１が水平スライド自在に嵌まっている。第２連動部材２１はブロック状に形成されており、操作ロッド６のスライド方向と同じ方向にスライドする。そして、第１連動部材１９の主動ピン部１７ｃは昇降支持体１１の上ガイド穴６０に向けて出没し得る一方、第２連動部材２１の下面には、主動ピン部１９ｃが下方から当接し得る傾斜状のカム面６１が形成されている。 An upper guide hole 60 having a substantially square cross section that opens toward the rear retainer 14 is formed in the detent portion 11g of the elevating support body 11, and the second interlocking member 21 is fitted in the upper guide hole 60 so as to be slidable horizontally. Yes. The second interlocking member 21 is formed in a block shape and slides in the same direction as the sliding direction of the operation rod 6. The main driving pin portion 17c of the first interlocking member 19 can be projected and retracted toward the upper guide hole 60 of the elevating support body 11, while the main driving pin portion 19c can abut on the lower surface of the second interlocking member 21 from below. An inclined cam surface 61 is formed.

第２連動部材２１のカム面６１は、第１作動部材２０から遠ざかるに従って高さが高くなるように傾斜しており、このため、第２連動部材２１が前進動すると第１連動部材１９は下向きに押されて下降動する。第２連動部材２１は第３ばね２２によって第１作動部材２０に接近し勝手となるように付勢されている。敢えて述べるまでもないが第３ばね２２は昇降支持体１１の上ガイド穴６０に配置されている。カム面６１の傾斜姿勢は逆にすることも可能であり、この場合は、操作ロッド６が後退位置から前進するとロック状態になる。 The cam surface 61 of the second interlocking member 21 is inclined so that the height increases as the distance from the first actuating member 20 increases. For this reason, when the second interlocking member 21 moves forward, the first interlocking member 19 faces downward. It is pushed down and moves downward. The second interlocking member 21 is urged by the third spring 22 so as to approach the first actuating member 20 and become free. Needless to say, the third spring 22 is disposed in the upper guide hole 60 of the lifting support 11. The inclined posture of the cam surface 61 can be reversed. In this case, when the operation rod 6 moves forward from the retracted position, the cam surface 61 is locked.

例えば図１２に示すように、第１作動部材２０は前後長手の角形に近い形状であり、リアリテーナ１４の内部にスライド自在に嵌まっている。第１作動部材２０には左右外側に張り出したフランジ２０ａが形成されている一方、リアリテーナ１４にはフランジ２０ａが前後スライド自在に嵌まるガイド溝１４ｂが形成さゃおり、これによって第１作動部材２０は落下不能に保持されている。また、第１作動部材２０は第２連動部材２１を押す細幅の押圧部２０ｂを有している。 For example, as shown in FIG. 12, the first actuating member 20 has a shape close to a longitudinal longitudinal square, and is slidably fitted inside the rear retainer 14. The first actuating member 20 is formed with a flange 20a projecting outward in the left and right directions, while the rear retainer 14 is provided with a guide groove 14b into which the flange 20a can be slid forward and backward, thereby forming the first actuating member 20. Is held infallible. The first actuating member 20 has a narrow pressing portion 20 b that presses the second interlocking member 21.

更に、第１作動部材２０は上向きに開口した箱状に形成されており、その内部にばね（引っ張りばね）２０′が内蔵されている。ばね２０′の後端は第１作動部材２０に形成した上向き突起２０ｃに引っ掛けられており、ばね２０′の前端はリアリテーナ１４に形成したバー部１４ｃに引っ掛けられている。従って、第１作動部材２０はばね２０′によって常に前向きに付勢されている。 Further, the first actuating member 20 is formed in a box shape opened upward, and a spring (tensile spring) 20 ′ is incorporated therein. The rear end of the spring 20 ′ is hooked on an upward projection 20 c formed on the first actuating member 20, and the front end of the spring 20 ′ is hooked on a bar portion 14 c formed on the rear retainer 14. Accordingly, the first actuating member 20 is always biased forward by the spring 20 '.

既述のとおり、第１作動部材２０を前進させたり後退させたりすることにより、車輪８と旋回部材１０とはロック状態とフリー状態とに切り替わる。そして、昇降支持体１１は回転不能で昇降のみ自在に保持されており、ロック状態とフリー状態とを問わず、掴持部１２ｂに指を当ててアジャスト部材１２を回転操作することでテーブル１の高さを調節できる。 As described above, by moving the first operating member 20 forward or backward, the wheel 8 and the turning member 10 are switched between the locked state and the free state. The elevating support 11 is non-rotatable and is held only up and down. Regardless of the locked state or the free state, the elevating support 11 is rotated by rotating the adjusting member 12 with a finger applied to the gripping portion 12b. You can adjust the height.

(4).操作手段の構成
次に、操作手段５の構造を主として図１３以下の図面に基づいて説明する。図１３及び図１４は操作手段５の構成部材の分離斜視図、図１５は要部の縦断側面図、図１６は脚ベース２ａを捨象した平面図、図１７は図１６の XVII-XVII視断面図、図１８は図１６の外ケースのみの XVIII-XVIII視断面図、図１９はフリー状態での図１６のXIX-XIX 視断面図、図２０は図１９の XX-XX視断面図、図２１はロック状態での図１９と同じ箇所の縦断側面図、図２２は図２１の XXII-XXII視断面図、図２３は第１作動部材２０と第２作動部材とジョイントとの関係を占めず分離断面図、図２４のうち（Ａ）は図２３のＡ−Ａ視図、（Ｂ）はＢ−Ｂ視図である。 (4). Configuration of the operation means Next, the structure of the operation means 5 will be described mainly with reference to FIG. 13 and 14 are separated perspective views of components of the operating means 5, FIG. 15 is a longitudinal side view of the main part, FIG. 16 is a plan view of the leg base 2a, and FIG. 17 is a sectional view taken along line XVII-XVII in FIG. 18 is a cross-sectional view taken along the line XVIII-XVIII of the outer case only, FIG. 19 is a cross-sectional view taken along the line XIX-XIX in FIG. 16, and FIG. 20 is a cross-sectional view taken along the line XX-XX in FIG. 21 is a longitudinal side view of the same portion as FIG. 19 in the locked state, FIG. 22 is a sectional view taken along line XXII-XXII in FIG. 21, and FIG. 23 does not occupy the relationship between the first operating member 20, the second operating member, and the joint. 24A is a sectional view taken along line AA in FIG. 23, and FIG. 24B is a sectional view taken along line BB.

図１３，１４に示すように、操作手段５は、上向きに開口した外ケース６４と、外ケース６４に上方から嵌まり込んだ昇降体６５と、外ケース６４に前側と後ろ側から嵌まり込んだ前後一対の第２作動部材６６と、昇降体６５をプッシュ動によって下降位置と上昇位置とに交互に変換するためのカム体６７及びばね６８、及び、後部のリアキャスタ４のロックを操作するための棒状のジョイント６９を備えている。ばね６８とジョイント６９とを除いた各部材は樹脂の成形品である。なお、以下の説明で前後の文言を使用するが、これは図１３に表示している方向を基準にしている。 As shown in FIGS. 13 and 14, the operating means 5 includes an outer case 64 that opens upward, an elevating body 65 that is fitted into the outer case 64 from above, and a front case and a rear side that are fitted into the outer case 64. In order to operate the pair of front and rear second actuating members 66, the cam body 67 and the spring 68 for alternately changing the elevating body 65 to the lowered position and the raised position by push movement, and the rear rear caster 4 lock. The rod-shaped joint 69 is provided. Each member excluding the spring 68 and the joint 69 is a resin molded product. In the following description, the terms before and after are used, but this is based on the direction displayed in FIG.

外ケース６４は前後長手で略上半部には左右の張り出し部６４ａを有しており、張り出し部６４ａが脚ベース２ａにビス（図示せず）で固定されている。外ケース６４は脚ベース２ａの内部に下方から嵌め込まれており、ビスは下方から脚ベース２ａにねじ込まれる。また、張り出し部６４ａにおける略上半部の側面（或いは上面）は正面視で傾斜面になっており、かつ、張り出し部６４ａには段部７０が凹み形成されており、脚ベース２ａには段部７０にきっちり嵌まるブロック部（図示せず）が形成されている。 The outer case 64 is longitudinally long and has left and right overhanging portions 64a in the substantially upper half, and the overhanging portion 64a is fixed to the leg base 2a with screws (not shown). The outer case 64 is fitted into the leg base 2a from below, and the screws are screwed into the leg base 2a from below. Further, the side surface (or upper surface) of the substantially upper half portion of the overhanging portion 64a is an inclined surface in a front view, and a stepped portion 70 is formed in the overhanging portion 64a, and a stepped portion is formed in the leg base 2a. A block portion (not shown) that fits in the portion 70 is formed.

また、外ケース６４の前後両前壁には略四角形のガイド穴７１が空いている一方、第２作動部材６６は前記ガイド穴７１にスライド自在に嵌まる角形部６６ａを有している。また、第２作動部材６６における角形部の先端には左右外向きに突出したガイド突起７３を設けている。第２作動部材６６の略前半部は第１作動部材２０に下方から嵌まるようになっており、かつ、第２作動部材６６には第１作動部材２０と一緒に前後動するための上向きストッパー７４を設けている。 In addition, a substantially rectangular guide hole 71 is formed in both the front and rear front walls of the outer case 64, while the second operating member 66 has a rectangular portion 66 a that is slidably fitted in the guide hole 71. In addition, a guide protrusion 73 protruding outward in the left-right direction is provided at the tip of the square portion of the second operating member 66. The substantially first half of the second actuating member 66 is fitted into the first actuating member 20 from below, and the second actuating member 66 is an upward stopper for moving back and forth together with the first actuating member 20. 74 is provided.

昇降体６５は概ね長方形に形成されていて前後に開口している。また、上端には平面視長円形（小判形）のボタン７５を嵌め込み装着している。ボタン７５は下部材７５ａと上部材７５ｂとの２つの部材から成っている。 The elevating body 65 is formed in a generally rectangular shape and is open forward and backward. In addition, an oval (oval) button 75 in a plan view is fitted and attached to the upper end. The button 75 includes two members, a lower member 75a and an upper member 75b.

昇降体６５の左右両側部でかつ前部と後部とには左右外向きに突出した爪７６が形成されている一方、図１７に示すように、外ケース６４の内部には前記爪７６がスライド自在に嵌まるガイド溝７７が形成されており、ガイド溝７７の上部にストッパー７７ａを設けることにより、昇降体６５の昇降ストロークが規制されている。言うまでもないが、爪７６はその弾性変形によってガイド溝７７に嵌まり込む。 The left and right sides of the lifting body 65 and the front and rear portions are formed with claws 76 projecting outward in the left and right directions, while the claw 76 slides inside the outer case 64 as shown in FIG. A guide groove 77 that fits freely is formed, and by providing a stopper 77 a on the upper portion of the guide groove 77, the lift stroke of the lift body 65 is restricted. Needless to say, the claw 76 is fitted into the guide groove 77 by its elastic deformation.

昇降体６５は前後に開口しており、その内部に第２作動部材６６の角形部７２３ａが入り込んでいる。そして、昇降体６５の左右内側面に、開口部が低くて奥に行くに従って高さが高くなる傾斜ガイド部７８を前後一対ずつ形成しており、第２作動部材６６のガイド突起７３が傾斜ガイド部７８の傾斜面に当接し得るように設定している。従って、昇降体６５が下降すると第２作動部材６６は外ケース６４の内部に向けて後退動し、逆に、昇降体６５が上昇すると第２作動部材６６は外ケース６４から抜け出る方向に前進動し得る。 The elevating body 65 is open in the front-rear direction, and the rectangular portion 723a of the second actuating member 66 enters therein. A pair of front and rear inclined guide portions 78 are formed on the left and right inner surfaces of the elevating body 65 so that the opening is low and the height increases toward the back, and the guide protrusion 73 of the second actuating member 66 is the inclined guide. It is set so that it can contact the inclined surface of the portion 78. Accordingly, when the elevating body 65 is lowered, the second operating member 66 is moved backward toward the inside of the outer case 64, and conversely, when the elevating body 65 is raised, the second operating member 66 is moved forward in a direction of coming out of the outer case 64. Can do.

昇降体６５における一方の側面には下向きに開口して側面視角形の凹所７９が形成されており、この凹所７９にカム６７が配置されている。正確に述べると、カム６７は昇降体６５の内部に入り込んだ軸部６７ａと凹所７９に収納されたレバー部６７ｂとを有しており、軸部６７ａの軸心回りに回動し得るように昇降体６５に嵌め込まれている。レバー部６７ｂの下端には外向きに突出する案内軸６７ｃを設けている。また、軸部６７ｂａはその付け根を除いて板状に形成されている。図２０に示すように、カム６７の軸部６７ａは昇降体６５の中間板８０に下方から重なるようになっており、かつ、ばね６８で上向きに付勢されている。 On one side surface of the elevating body 65, a recess 79 is formed that opens downward and has a side view, and a cam 67 is disposed in the recess 79. More precisely, the cam 67 has a shaft portion 67a that enters the inside of the elevating body 65 and a lever portion 67b that is accommodated in the recess 79, so that the cam 67 can rotate around the shaft center of the shaft portion 67a. Is fitted into the lifting body 65. A guide shaft 67c protruding outward is provided at the lower end of the lever portion 67b. Further, the shaft portion 67ba is formed in a plate shape except for its root. As shown in FIG. 20, the shaft portion 67 a of the cam 67 overlaps the intermediate plate 80 of the elevating body 65 from below and is biased upward by a spring 68.

外ケース６４のうち昇降体６５の凹所７９と対向した部位には、図１８に示すように、カム６７の案内軸６７ｃが係合し得る上案内部８１と下案内部８２とを一体に形成している。上案内部８１は下向き凹みを有する矢尻形でかつ側面視で係止している。他方、下案内部８２は上向きに開口している。上下の案内部８１，８２はカム６７の案内軸６７ｃを一体方向に周回させるワンウエイ機構の一例である。 As shown in FIG. 18, an upper guide portion 81 and a lower guide portion 82 that can be engaged with the guide shaft 67 c of the cam 67 are integrated with a portion of the outer case 64 that faces the recess 79 of the elevating body 65. Forming. The upper guide portion 81 has an arrowhead shape having a downward dent and is locked in a side view. On the other hand, the lower guide portion 82 opens upward. The upper and lower guide portions 81 and 82 are an example of a one-way mechanism for rotating the guide shaft 67c of the cam 67 in the integral direction.

図１９，２０ではフリー状態（ロック解除状態）を示しており、の状態では昇降体６５は上昇していてカム６７の案内軸６７ｃは上案内部８１の上方に位置している。他方、図２１，２２はロック状態を示しており、この状態では、昇降体６５は下降しており、かつ、カム６７の案内軸６７ｃが上案内部８１に下方から嵌まっていることにより、昇降体６５は下降位置に保持されている。 19 and 20 show a free state (unlocked state). In this state, the elevating body 65 is raised and the guide shaft 67c of the cam 67 is located above the upper guide portion 81. On the other hand, FIGS. 21 and 22 show a locked state. In this state, the elevating body 65 is lowered, and the guide shaft 67c of the cam 67 is fitted into the upper guide portion 81 from below. The elevating body 65 is held at the lowered position.

そして、ロック状態から昇降体６５を下向きに押すと、支軸６７ａの上面が昇降体６５の中間板８０に密着しようとすることでレバー６７ｂが図２１において半時計回りに僅かに回動し、これにより、カム６７の案内軸６７ｃは若干下降してから上昇しても上案内部８１に引っ掛かることなく上方に逃げる。フリー状態から昇降体６５を下向きに押すと、カム６７の案内軸６７ｃは上案内部８１の上傾斜面のガイド作用で下降しつつ図１９で左に寄っていき、その結果、上案内部８１に下方から嵌まり込んで図２１の状態に移行する。 When the lifting body 65 is pushed downward from the locked state, the upper surface of the support shaft 67a tries to come into close contact with the intermediate plate 80 of the lifting body 65, so that the lever 67b slightly rotates counterclockwise in FIG. Thereby, even if the guide shaft 67c of the cam 67 is slightly lowered and then lifted, it escapes upward without being caught by the upper guide portion 81. When the elevating body 65 is pushed downward from the free state, the guide shaft 67c of the cam 67 descends due to the guide action of the upper inclined surface of the upper guide portion 81 and moves to the left in FIG. 21 from below and shift to the state of FIG.

例えば図１５から理解できるように、第２作動部材６６はその上向きストッパー７４が第１作動部材２０に下方から嵌まっている。このため、既述のとおり第１さ２０と第２さ６６とは一緒に前後動する。また、第２作動部材６６は外ケース６４によって倒れ不能及び軸心回りに回転不能に保持されている。 For example, as can be understood from FIG. 15, the second operating member 66 has an upward stopper 74 fitted into the first operating member 20 from below. Therefore, as described above, the first 20 and the second 66 move back and forth together. The second actuating member 66 is held by the outer case 64 so as not to fall down and to rotate around the axis.

図２３，２４に示すように、第１作動部材２０と第２作動部材６６とには、円形のジョイント６９を落下不能に保持するための左右一対の抱持部８３と、ジョイント６９の端部に設けたスナップリング８４が嵌まる位置決め溝８５とを形成している。本実施形態では、後ろ側のキャスタ４の第１作動部材２０と後ろ側の第２作動部材６６とが実ジョイント６９で連結されている。 As shown in FIGS. 23 and 24, the first operating member 20 and the second operating member 66 include a pair of left and right holding portions 83 for holding the circular joint 69 so as not to drop, and end portions of the joint 69. And a positioning groove 85 into which the snap ring 84 provided in is fitted. In the present embodiment, the first operating member 20 of the rear caster 4 and the rear second operating member 66 are connected by the actual joint 69.

既述のとおり操作手段５のボタン７５は上下の部材７５ａ，７５ｂからなっており、下部材７５ａは弾性爪（図示せず）によって昇降体６５の本体部に抜け不能に保持されており、他方、上部材７５ｂはこれに設けた弾性爪（図示せず）によって下部材７５ａに離脱不能に保持されている。そして、下部材７５ａはアクリル等の透明な樹脂でブロック状（中実）に形成されており、また、上部材７５ｂは透明又は半透明な樹脂からなっている。そして、フリー状態では下部才７５ａの端面が外側に露出して、ロック状態では下部才７５ａの端面が外ケース６４の内部に隠れるように設定している。 As described above, the button 75 of the operation means 5 is composed of upper and lower members 75a and 75b, and the lower member 75a is held by the elastic claws (not shown) in the main body of the elevating body 65 so that it cannot be removed. The upper member 75b is held by the lower member 75a so as not to be detached by elastic claws (not shown) provided thereon. The lower member 75a is made of a transparent resin such as acrylic in a block shape (solid), and the upper member 75b is made of a transparent or translucent resin. The end face of the lower age 75a is exposed to the outside in the free state, and the end face of the lower age 75a is set to be hidden inside the outer case 64 in the locked state.

このようにフリー状態とロック状態とで下部材７５ａの端面を見せたり隠したりすることにより、ロック状態とフリー状態とを目視で区別することができる。上部材７５ｂは不透明な素材製としても良いが、透明又は半透明な素材を採用すると、上部材７５ｂを介して下部材７５ａに入射した光が下部材７５ａの端面が射出されることにより、下部材７５ａの外周面が輝いて見える現象があり、その結果、ロック状態とフリー状態とを目視によってより明確に区別することができる。この点は本実施形態の利点である。 Thus, the locked state and the free state can be visually distinguished by showing or hiding the end surface of the lower member 75a in the free state and the locked state. The upper member 75b may be made of an opaque material, but if a transparent or translucent material is used, the light incident on the lower member 75a through the upper member 75b is emitted from the end surface of the lower member 75a, There is a phenomenon in which the outer peripheral surface of the member 75a appears to shine. As a result, the locked state and the free state can be more clearly distinguished by visual observation. This is an advantage of this embodiment.

(5).まとめ
昇降体６５が上昇しているフリー状態では、第２作動部材６６及び第１作動部材２０はばね２０′に引っ張られて前進状態に保持されており、この状態では第１連動部材１９は下降している。そして、昇降体６５が押されてロック状態になると、第１作動部材６６及び第２作動部材２０はばね２０′に抗して後退し、すると、第２連動部材１９は上昇動して旋回部材１０の旋回と車輪８の回転とが阻止される。 (5) Summary In the free state in which the elevating body 65 is raised, the second operating member 66 and the first operating member 20 are pulled and held in the forward state by the spring 20 ′. In this state, the first interlocking is performed. The member 19 is lowered. When the elevating body 65 is pushed and locked, the first actuating member 66 and the second actuating member 20 are retracted against the spring 20 '. Then, the second interlocking member 19 is moved upward to turn the turning member. 10 turns and rotation of the wheel 8 is prevented.

両作動部材６６，２０はばね２０′で後退方向に付勢されているため、ロック状態において第２作動部材６６のガイド突起７３が傾斜ガイド部７８の傾斜面に当たっていると、ロック状態において第２作動部材６６はばねで前進し勝手になり（フリー状態に移行し勝手になり）、このため、カム６７に負担がかかる虞がある。この点について本実施形態では、例えば図２１に示すように、ロック状態では第２作動部材６６のガイド突起７３は昇降体６５に形成した鉛直支持部８６に当接するように設定している。このため、第２作動部材６６に水平方向の外力が作用してもその外力がカム６７に波及することはなく、その結果、細かくて強度的に弱いカム６７でありながら破損を防止できる。 Since both the actuating members 66 and 20 are biased in the backward direction by the spring 20 ′, if the guide projection 73 of the second actuating member 66 hits the inclined surface of the inclined guide portion 78 in the locked state, the second in the locked state. The actuating member 66 moves forward with a spring and becomes selfish (it shifts to a free state and becomes selfish). In this embodiment, for example, as shown in FIG. 21, the guide projection 73 of the second operating member 66 is set to abut on a vertical support portion 86 formed on the lifting body 65 in the locked state. For this reason, even if a horizontal external force acts on the second actuating member 66, the external force does not reach the cam 67. As a result, the cam 67 can be prevented from being broken even though it is fine and weak in strength.

本実施形態ではプッシュボタンが下降位置ではロック状態で上昇位置ではフリー状態になるように設定しているが、これとは逆に、プッシュボタンが上昇位置ではロック状態で下降位置ではフリー状態になるように設定することも可能である。また、脚ベースの下面の開口部を塞ぐカバーを設けることも可能である。この場合は、カバーはキャスタの動きを阻害しない範囲で全体を覆うことも可能であるし、操作手段の部分を部分的に塞ぐことも可能である。 In this embodiment, the push button is set to be locked in the lowered position and free in the raised position. Conversely, the push button is locked in the raised position and free in the lowered position. It is also possible to set as follows. It is also possible to provide a cover that closes the opening on the lower surface of the leg base. In this case, the cover can cover the entire area as long as the movement of the caster is not hindered, or the operation means can be partially blocked.

プッシュボタンの動きを第２作動部材の前後動（水平動）に変換する機構は実施形態のような回動式カムを使用したものには限らず、回転式のカムを使用したものなど様々の機構を採用できる。また、キャスタは高さ調節機能を備えていなくても良いことは言うまでもない。 The mechanism for converting the movement of the push button into the back-and-forth movement (horizontal movement) of the second operating member is not limited to the one using the rotary cam as in the embodiment, but various ones such as one using a rotary cam. The mechanism can be adopted. Needless to say, the caster need not have a height adjusting function.

（Ａ）は折り畳み式テーブルの側面図、（Ｂ）は部分的な分離側面図である。(A) is a side view of a folding table, (B) is a partial separated side view. キャスタの分離斜視図である。It is a separation perspective view of a caster. （Ａ）はフリー状態での縦断側面図、（Ｂ）は（Ａ）の部分的な拡大図である。(A) is a longitudinal side view in a free state, (B) is a partially enlarged view of (A). （Ａ）はロック状態での縦断側面図、（Ｂ）はアジャスト部材の斜視図である。(A) is a vertical side view in the locked state, and (B) is a perspective view of the adjusting member. 分離側面図である。FIG. 分離側断面図である。FIG. 分離側断面図である。FIG. 図３（Ａ）の VIII-VIII視断面図である。FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 図３（Ａ）の IX-IX視断面図である。It is the IX-IX view sectional view of Drawing 3 (A). 図３（Ａ）の X-X視方向から見た分離平断面図である。It is the isolation | separation plane sectional view seen from the XX view direction of FIG. 3 (A). 図７の XI-XI視断面図である。FIG. 8 is a sectional view taken along line XI-XI in FIG. 7. 第１作動部材とリアリテーナとの一部破断分離斜視図である。It is a partially broken isolation perspective view of a 1st operation member and a rear retainer. 操作手段の構成部材の分離斜視図である。It is a separate perspective view of the structural member of an operation means. 操作手段の構成部材の分離斜視図である。It is a separate perspective view of the structural member of an operation means. 操作手段の要部の縦断側面図である。It is a vertical side view of the principal part of an operation means. 脚ベース２ａを捨象した平面図である。It is the top view which discarded the leg base 2a. 図１６の XVII-XVII視断面図である。It is the XVII-XVII sectional view taken on the line of FIG. 図１６の外ケースのみの XVIII-XVIII視断面図である。FIG. 17 is a cross-sectional view of only the outer case of FIG. 16 taken along the line XVIII-XVIII. フリー状態での図１６のXIX-XIX 視断面図である。FIG. 17 is a sectional view taken along line XIX-XIX in FIG. 16 in a free state. 図１９の XX-XX視断面図である。FIG. 20 is a sectional view taken along the line XX-XX in FIG. 19. ロック状態での図１９と同じ箇所の縦断側面図である。It is a vertical side view of the same location as FIG. 19 in the locked state. 図２１の XXII-XXII視断面図である。FIG. 22 is a sectional view taken along line XXII-XXII in FIG. 21. 第１作動部材と第２作動部材とジョイントとの関係を占めす分離断面図である。It is a separated sectional view which occupies the relation of the 1st operation member, the 2nd operation member, and a joint. 図２３のＡ−Ａ視図、Ｂ−Ｂ視図である。It is the AA view of FIG. 23, and the BB view.

Explanation of symbols

１家具の一例としてのテーブル
２ａテーブルにおける脚装置の脚ベース
４キャスタ
５操作手段
８車輪
１０旋回部材
１１昇降支持体
１９第１連動部材
２０第１作動部材
２１第２連動部材
６４外ケース
６５昇降体
６６第２作動部材
６７カム
６９ジョイント
７５プッシュボタン DESCRIPTION OF SYMBOLS 1 Table as an example of furniture 2a Leg base of leg apparatus in table 4 Caster 5 Operating means 8 Wheel 10 Turning member 11 Lifting support body 19 First interlocking member 20 First operating member 21 Second interlocking member 64 Outer case 65 Lifting body 66 Second actuating member 67 Cam 69 Joint 75 Push button

Claims

A leg base extending substantially horizontally along the floor, and a caster formed by attaching a wheel to a swivel member is provided at both front and rear ends of the leg base; Both or one of them is provided with a lock mechanism that locks either or both of the rotation of the wheel and the horizontal rotation of the swivel member, and further, the lock mechanism of the caster is locked on the leg base. In the configuration that operation means for switching to the free state is provided,
The lock mechanism includes a first actuating member that reciprocates in the horizontal direction along the longitudinal direction of the leg base, while the operating means is a lifting body that alternates between a lowered position and a raised position by a downward push operation. And a second actuating member that is alternately switched between a state of being advanced toward the longitudinal direction of the leg base and a state of being retracted in conjunction with the switching of the elevating body alternately between the lowered position and the raised position. And connecting the first actuating member and the second actuating member directly or via a joint,
Furniture with casters.

The first actuating member and the second actuating member are provided with a direct coupling means for directly coupling the two actuating members and an indirect coupling means for coupling a joint, and the operation means is forward-facing. Two second actuating members, a second actuating member and a rearward facing second actuating member, are provided, and the two front and rear second actuating members are set to move in opposite directions in conjunction with the lifting body. Yes,
The furniture with casters according to claim 1.

While the leg base is formed in a substantially bowl-like shape that opens downward, the operation means includes a case on which an elevating body is mounted so as to be movable up and down, and the elevating body has a button protruding upward from the case. The operating means is fitted and attached to the leg base from below so that only the button is exposed above the leg base, and the second actuating member is fitted to the first base by fitting upward. Connected to the actuating member,
The furniture with casters according to claim 1 or 2.