JP4833002B2 - desk - Google Patents
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- JP4833002B2 JP4833002B2 JP2006243820A JP2006243820A JP4833002B2 JP 4833002 B2 JP4833002 B2 JP 4833002B2 JP 2006243820 A JP2006243820 A JP 2006243820A JP 2006243820 A JP2006243820 A JP 2006243820A JP 4833002 B2 JP4833002 B2 JP 4833002B2
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Description
本発明は、脚体の前方に延出する左右１対の平行リンク機構の前端部により、天板を昇降可能に支持してなる机に関する。 The present invention relates to a desk that is supported by a front end portion of a pair of left and right parallel link mechanisms extending forward of a leg so as to be movable up and down.
この種の机としては、例えば特許文献１に記載されているように、脚体に後端が枢着された左右１対の前方を向く平行リンク機構の前端を、天板（副卓板）の後端部に枢着するとともに、下位のリンク杆同士を横連結杆により連結し、下位のリンク杆と脚体との間に設けたガススプリングを作動させることにより、天板を昇降させうるようにしたものがある。
上記特許文献に記載されている机のように、脚体の前方に延出する平行リンク機構により天板を支持し、この天板をガススプリングにより昇降させると、天板の荷重が、ガススプリングを介して、横連結杆に大きな曲げ荷重となって作用し、そのガススプリングの取付部が変形したり、全体が撓んだりして、天板を安定して昇降させることができなくなる恐れがある。 Like the desk described in the above-mentioned patent document, the top plate is supported by a parallel link mechanism extending in front of the legs, and when the top plate is moved up and down by the gas spring, the load on the top plate is changed to the gas spring. It acts as a large bending load on the horizontal connecting rod, and the mounting portion of the gas spring may be deformed or the whole may be bent, and the top plate may not be able to be raised and lowered stably. is there.
これを防止するためには、横連結杆の断面形状を大としたり、強度の高い材料を使用するなどして、横連結杆の剛性を高める必要があり、このようにすると、横連結杆が大型化して、重量が増大するとともに、コストも上昇する。 In order to prevent this, it is necessary to increase the rigidity of the horizontal connection rods by increasing the cross-sectional shape of the horizontal connection rods or using a material having high strength. As the size increases, the weight increases and the cost also increases.
本発明は、上記問題点に鑑みてなされたもので、ガススプリングの後端を支持する横連結杆の強度を、簡単かつ安価な手段により向上させ、天板を安定して昇降させうるようにした机を提供することを目的としている。 The present invention has been made in view of the above-described problems, and can improve the strength of the lateral connection rod supporting the rear end of the gas spring by simple and inexpensive means so that the top plate can be moved up and down stably. The purpose is to provide a desk.
本発明によると、上記課題は、次のようにして解決される。
（１）脚体より前方に延出し、かつ後端が脚体の前端部に枢着された上下１対のリンクアームよりなる左右１対の平行リンク機構の前端部により、天板を昇降可能に支持するとともに、前記脚体における前記左右の平行リンク機構の枢着部同士を、中空状の横連結杆により連結し、この横連結杆の左右方向の中間部と、前記天板の下面の左右方向の中間部とに、天板昇降用ガススプリングの前後の端部を連結し、かつ前記横連結杆におけるガススプリングの連結部近傍の中空孔内に、補強部材を嵌入する。
According to the present invention, the above problem is solved as follows.
(1) The top plate can be moved up and down by the front end portions of a pair of left and right parallel link mechanisms that are composed of a pair of upper and lower link arms that extend forward from the legs and whose rear ends are pivotally attached to the front ends of the legs. Are connected to each other by a hollow horizontal connecting rod, and a horizontal intermediate portion of the horizontal connecting rod and a lower surface of the top plate are connected to each other. The front and rear end portions of the gas spring for raising and lowering the top plate are connected to the intermediate portion in the left-right direction, and a reinforcing member is inserted into the hollow hole in the vicinity of the connecting portion of the gas spring in the horizontal connecting rod.
（２）上記(１)項において、左右の平行リンク機構における下位のリンクアームの後端同士を、横連結杆の中空孔に挿通した左右方向を向く連結軸の両側端に連結するとともに、前記連結軸の左右方向の中間部を、補強部材に形成した挿通孔に、密接させて、相対回動可能に嵌合する。 (2) In the above item (1), the rear ends of the lower link arms in the left and right parallel link mechanisms are connected to both side ends of the connecting shaft facing the left and right direction inserted through the hollow hole of the horizontal connecting rod, The intermediate part of the connecting shaft in the left-right direction is brought into close contact with the insertion hole formed in the reinforcing member, and is fitted so as to be relatively rotatable.
（３）上記(１)または(２)項において、横連結杆の中空孔と補強部材との断面形状を、互いにほぼ補形をなすものとする。 (3) In the above item (1) or (2), the cross-sectional shapes of the hollow hole of the lateral coupling rod and the reinforcing member are substantially complementary to each other.
（４）上記(１)〜(３)項のいずれかにおいて、補強部材の外周面に、横連結杆の中空孔の内面に接触する突条を、左右方向に向かって複数突設する。 (4) In any one of the above items (1) to (3), a plurality of protrusions that contact the inner surface of the hollow hole of the lateral connection rod are provided on the outer peripheral surface of the reinforcing member in the left-right direction.
（５）上記(１)〜(４)項のいずれかにおいて、横連結杆に、ガススプリングの後端を枢着するブラケットを、横連結杆の中空孔内に突出するようにしたボルトにより固定し、このボルトの先端部に、補強部材の側面を当接させる。 (5) In any one of the above items (1) to (4), a bracket that pivotally attaches the rear end of the gas spring is fixed to the horizontal connecting rod with a bolt that protrudes into the hollow hole of the horizontal connecting rod. Then, the side surface of the reinforcing member is brought into contact with the tip of the bolt.
請求項１記載の発明によれば、横連結杆における天板昇降用ガススプリングの連結部近傍の中空孔内に、補強部材を嵌入しているため、横連結杆の左右方向の中央部付近の曲げ強度が向上する。
従って、脚体の前方に延出する平行リンク機構の前端部により天板を支持し、この天板をガススプリングにより昇降させる際において、ガススプリングを介して横連結杆の中央部に大きな荷重が加わっても、横連結杆におけるガススプリングの連結部が変形したり、全体が撓むなどする恐れは小さく、天板を安定して昇降させることができる。
また、横連結杆を強度の高い高価な材料により形成したり、断面形状を大きくしたりする必要がないので、横連結杆のコストを低減しうるとともに、小型軽量化が図れる。
According to invention of
Therefore, when the top plate is supported by the front end portion of the parallel link mechanism extending forward of the leg, and when the top plate is moved up and down by the gas spring, a large load is applied to the central portion of the lateral connection rod via the gas spring. Even if it adds, there is little possibility that the connection part of the gas spring in the horizontal connection rod will be deformed or the whole will be bent, and the top plate can be raised and lowered stably.
In addition, since it is not necessary to form the lateral connection rod with an expensive and high-strength material or to increase the cross-sectional shape, the cost of the horizontal connection rod can be reduced, and the size and weight can be reduced.
請求項２記載の発明によれば、横連結杆の中空孔に挿通された、左右のリンク機構における下位のリンクアーム同士を連結している連結軸を、補強部材の挿通孔に、密接させて嵌合しているので、連結軸も補強部材として機能し、横連結杆の強度はより高まる。 According to the second aspect of the present invention, the connecting shaft that connects the lower link arms of the left and right link mechanisms inserted through the hollow hole of the horizontal connecting rod is brought into close contact with the insertion hole of the reinforcing member. Since it is fitted, the connecting shaft also functions as a reinforcing member, and the strength of the lateral connecting rod is further increased.
請求項３記載の発明によれば、横連結杆の中空孔に、補強部材を適正に嵌入しうるので、横連結杆は、前後及び上下のいずれの方向にも変形しにくくなる。 According to the third aspect of the present invention, the reinforcing member can be properly fitted into the hollow hole of the horizontal connecting rod, so that the horizontal connecting rod is less likely to be deformed in any of the front and rear and upper and lower directions.
請求項４記載の発明によれば、横連結杆の中空孔と、補強部材の外周面との摺動抵抗が小さくなるので、補強部材を横連結杆の中空孔内に容易に嵌入することができる。 According to the fourth aspect of the present invention, the sliding resistance between the hollow hole of the lateral connection rod and the outer peripheral surface of the reinforcing member is reduced, so that the reinforcement member can be easily fitted into the hollow hole of the lateral connection rod. it can.
請求項５記載の発明によれば、横連結杆の中空孔におけるガススプリングの連結部近傍に、補強部材を、容易に位置決めして嵌入することができる。 According to the fifth aspect of the present invention, the reinforcing member can be easily positioned and fitted in the vicinity of the connecting portion of the gas spring in the hollow hole of the horizontal connecting rod.
以下、本発明の実施形態を、図面に基づいて説明する。
図１は、本発明の机の一実施形態の斜視図、図２は、同じく側面図、図３は、同じく天板と補助天板とを取り除いた支持フレームの斜視図である。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of an embodiment of the desk of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a perspective view of a support frame from which a top plate and an auxiliary top plate are removed.
支持フレーム(１)は、側面視倒立Ｔ字状をなす左右１対の脚体(２)(２)と、各脚体(２)の上端に固着され、脚体(２)の一部をなす前後方向を向く支持杆(３)(３)と、左右の支持杆(３)(３)の前端部同士および後端部同士を連結する前後の横連結杆(４)(５)と、左右の支持杆(３)(３)の前部に、前方（以下、図１および図２の斜め左下方を前として説明する）を向くように取付けられた天板支持体(６)とを備えている。 The support frame (1) is fixed to a pair of left and right legs (2) and (2) having an inverted T shape when viewed from the side, and the upper ends of the legs (2). A supporting rod (3) (3) facing in the front-rear direction, and a laterally connecting rod (4) (5) before and after connecting the front ends and rear ends of the left and right support rods (3) (3); A top plate support (6) attached to the front part of the left and right support rods (3) and (3) so as to face the front (hereinafter, described diagonally lower left in FIGS. 1 and 2). I have.
脚体(２)は、前後方向を向くベース脚(2a)と、その中央よりも若干後部側において起立する、平面視概ね楕円形断面の脚柱(2b)とからなっている。ベース脚(2a)の前後の端部の下面には、高さ調整用のアジャスタ(2c)が設けられている。 The leg body (2) is composed of a base leg (2a) facing in the front-rear direction and a pedestal (2b) having an approximately elliptical cross section in plan view, which stands slightly rearward of the center. Height adjusters (2c) are provided on the lower surfaces of the front and rear end portions of the base leg (2a).
図２及び図３に示すように、上記天板支持体(６)は、左右１対の支持杆(３)(３)の前端部に、上下方向に回動可能に装着された、前方を向く左右１対の平行リンク機構(７)(７) を備えている。 As shown in FIGS. 2 and 3, the top plate support (6) is mounted on the front end of a pair of left and right support rods (3) and (3) so as to be pivotable in the vertical direction. A pair of parallel link mechanisms (7) and (7) facing left and right are provided.
左右の平行リンク機構(７)(７)は、左右の支持杆(３)(３)の前端部に一体的に形成した軸受部(８)(８)により回動自在に枢支され、かつ前方の横連結杆(４)内に挿通された、後記する連結軸(30)の両端に後端部が固嵌された前方を向く第１リンクアーム(９)と、その内方において、後端が支持杆(３)の前端上部に設けられた上向突部(10)に、左右方向を向く枢軸(11)をもって回動自在に枢支された、第１リンクアーム(９)よりも上位に位置する段違いの第２リンクアーム(12)と、第１、第２リンクアーム(９)(12)が互いに平行をなすようにして、その前端部に左右方向を向く軸(13)(第２リンクアーム側の軸は図示略)をもって連結された側面視ほぼＴ字状をなす昇降体(14)とを備えている。 The left and right parallel link mechanisms (7) and (7) are pivotally supported by bearings (8) and (8) integrally formed at the front ends of the left and right support rods (3) and (3), and A first link arm (9) that is inserted into the front lateral connecting rod (4) and has a rear end portion fixedly fitted to both ends of a connecting shaft (30) to be described later, Than the first link arm (9), whose end is pivotally supported by an upward projection (10) provided at the upper front end of the support rod (3) with a pivot (11) pointing in the left-right direction. The second link arm (12), which is located at the upper level, and the first and second link arms (9), (12) are parallel to each other, and a shaft (13) (13) The shaft on the second link arm side is provided with an elevating body (14) having a substantially T-shape in a side view connected with a shaft (not shown).
左右の昇降体(14)(14)の上端後部同士は、左右方向を向く連結杆(15)をもって互いに連結されている。
左右の昇降体(14)(14)の上端前部には、天板(16)の下面両側部に固着した前後方向を向くブラケット(17)(17)の前端部が、天板(16)の重心より前方において、左右方向を向く軸(18)をもって枢着されている。
The upper rear portions of the left and right lifting bodies (14), (14) are connected to each other with a connecting rod (15) facing in the left-right direction.
The front end of the brackets (17) (17) facing the front-rear direction fixed to both sides of the lower surface of the top plate (16) are located at the front upper ends of the left and right lifting bodies (14), (14). It is pivotally attached with an axis (18) facing left and right in front of the center of gravity.
天板(16)の後方には、横長の補助天板(19)が、その左右両側部下面に設けた１対の脚杆(20)(20)を、左右の支持杆(３)(３)を貫通して、脚体(２)(２)内に高さ調節可能として嵌合することにより、上下位置調節可能に支持されている。 Behind the top plate (16), a horizontally long auxiliary top plate (19) has a pair of leg rods (20) and (20) provided on the lower surfaces of both left and right sides, and left and right support rods (3) (3 ) And is fitted in the legs (2) and (2) so that the height can be adjusted, so that the vertical position can be adjusted.
連結杆(15)の中央部と、横連結杆(４)の中央部とには、連結杆(15)を介して、天板(16)を上昇する方向に付勢する昇降用の油圧ロック付きガススプリング(21)の各端部が、側面視においてガススプリング(21)が第１、第２リンクアーム(９)(12)に対して交差する方向を向くようにして連結されている。
また、ガススプリング(21)の側方において、横連結杆(４)と、天板(16)における重心より後方の部分とには、天板(16)の後部を上向きに付勢する天板傾斜用の油圧ロック付きガススプリング(22)の前後の端部が、ブラケット(23)(23)及び左右方向を向く軸(図示略)をもって枢着されている。
A hydraulic lock for raising and lowering that urges the top plate (16) in the ascending direction via the connecting rod (15) at the central portion of the connecting rod (15) and the central portion of the horizontal connecting rod (4). Each end of the attached gas spring (21) is connected so that the gas spring (21) faces the first and second link arms (9) and (12) in a side view.
Further, on the side of the gas spring (21), the top plate that urges the rear portion of the top plate (16) upwards to the laterally connected rod (4) and the portion behind the center of gravity of the top plate (16). The front and rear ends of the gas spring (22) with a hydraulic lock for tilting are pivotally attached with brackets (23) and (23) and a shaft (not shown) facing in the left-right direction.
天板昇降用のガススプリング(21)の後端は、図４及び図５にも示すように、横連結杆(４)の前面中央部に左右２本のボルト(24)をもって固着されたブラケット(25)に、左右方向を向く枢軸(26)により枢着されている。
上記前部側の横連結杆(４)は、図４及び図５に示すように、アルミニウム合金等により、両側端が開口する角管状に形成され、その両側端は、左右の第１リンクアーム(９)の後端の枢着部である左右１対の支持杆(３)における前端の対向面に固着されている。
As shown in FIGS. 4 and 5, the rear end of the gas spring (21) for raising and lowering the top plate is a bracket fixed with two bolts (24) on the front side of the lateral connection rod (4). It is pivotally attached to (25) by a pivot (26) pointing in the left-right direction.
As shown in FIGS. 4 and 5, the front side lateral coupling rod (4) is formed of an aluminum alloy or the like into a square tube having both side ends open, and the both side ends are the left and right first link arms. (9) It is fixed to the opposing surface of the front end of the pair of left and right support rods (3) which are pivotal portions at the rear end.
横連結杆(４)の中空孔内における左右方向の中央部、すなわち天板昇降用ガススプリング(21)の後端の取付部付近には、横連結杆(４)の中空孔の断面形状とほぼ補形をなす例えばポリアセタール等よりなる硬質の補強部材(27)が嵌合されている。 There is a cross-sectional shape of the hollow hole of the horizontal connection rod (4) in the horizontal center in the hollow hole of the horizontal connection rod (4), that is, in the vicinity of the mounting portion at the rear end of the gas spring (21) for raising and lowering the top plate. A hard reinforcing member (27) made of, for example, polyacetal or the like, which is substantially complementary, is fitted.
補強部材(27)は、横連結杆(４)に螺合されたブラケット(25)取付用の一方(右方)のボルト(24)における先端部、すなわち横連結杆(４)内への突出端部に当接する位置まで、横連結杆(４)の側端よりその内部に嵌入されている。なお、補強部材(27)における前後及び上下の外周面には、横連結杆(４)の中空孔の内面に接触する左右方向を向く複数の突条(28)が形成され、横連結杆(４)の中空孔と、補強部材の外周面との摺動抵抗を小さくすることにより、補強部材(27)を横連結杆(４)内に容易に嵌合しうるようにしてある。 The reinforcing member (27) is protruded into the front end of one (right) bolt (24) for mounting the bracket (25) screwed to the horizontal connecting rod (4), that is, into the horizontal connecting rod (4). From the side end of the lateral coupling rod (4), it is inserted into the inside until the position where it abuts on the end. In addition, a plurality of protrusions (28) facing the left and right direction contacting the inner surface of the hollow hole of the lateral connection rod (4) are formed on the front and rear and upper and lower outer peripheral surfaces of the reinforcing member (27). By reducing the sliding resistance between the hollow hole of 4) and the outer peripheral surface of the reinforcing member, the reinforcing member (27) can be easily fitted into the lateral coupling rod (4).
補強部材(27)には、左右方向を向く挿通孔(29)が穿設され、この挿通孔(29)により、横連結杆(４)に挿通された、上記左右の第１リンクアーム(９)同士を連結している連結軸(30)の左右方向の中央部が、相対回動可能に支持されている。 The reinforcing member (27) has an insertion hole (29) facing in the left-right direction, and the left and right first link arms (9) inserted into the lateral connection rod (4) through the insertion hole (29). The central part of the left and right direction of the connecting shaft (30) that connects them is supported so as to be relatively rotatable.
以上説明したように、上記実施形態の机においては、角管状をなす前部側の横連結杆(４)の中央部に、補強部材(27)を嵌入しているため、特に、横連結杆(４)の中央部の曲げ強度が大となる。従って、脚体(２)の前方に延出する平行リンク機構(７)の前端部により天板(16)を支持し、この天板(16)をガススプリング(21)により昇降させる際において、ガススプリング(21)を介して横連結杆(４)の中央部に大きな荷重が加わっても、その部分が変形したり、横連結杆(４)全体が撓んだりする恐れは小さくなる。
その結果、天板(16)を安定よく昇降させることができる。
As described above, in the desk of the above-described embodiment, the reinforcing member (27) is fitted in the central portion of the front side lateral coupling rod (4) having a rectangular tube shape. The bending strength at the center of (4) is increased. Therefore, when the top plate (16) is supported by the front end portion of the parallel link mechanism (7) extending forward of the leg (2) and the top plate (16) is moved up and down by the gas spring (21), Even if a large load is applied to the central portion of the horizontal connecting rod (4) via the gas spring (21), the possibility that the portion is deformed or the entire horizontal connecting rod (4) is bent is reduced.
As a result, the top plate (16) can be raised and lowered stably.
また、補強部材(27)の挿通孔(29)により、左右の第１リンクアーム(９)に両端が連結された連結軸(30)が、相対回動可能に支持されているので、連結軸(30)も補強部材として機能し、横連結杆(４)の中央部の強度はより高まる。
このように、角管状とした横連結杆(４)内の中央部に、短寸の補強部材(27)を嵌入するのみの簡単な手段で横連結杆(４)の強度を大としうるので、それを強度の高い高価な材料により形成したり、断面形状を大きくしたりする必要はなく、横連結杆(４)のコストを低減しうるとともに、小型軽量化が図れる。
Further, the connecting shaft (30) having both ends connected to the left and right first link arms (9) is supported by the insertion holes (29) of the reinforcing member (27) so as to be relatively rotatable. (30) also functions as a reinforcing member, and the strength of the central portion of the lateral connection rod (4) is further increased.
In this way, the strength of the horizontal connecting rod (4) can be increased by a simple means by simply inserting the short reinforcing member (27) into the central portion of the rectangular tubular horizontal connecting rod (4). It is not necessary to form it with an expensive and high-strength material or to increase the cross-sectional shape, so that the cost of the lateral connection rod (4) can be reduced and the size and weight can be reduced.
なお、上記実施形態では、補強部材(27)の嵌合位置を、横連結杆(４)の中央よりもやや右方としているが、図５の２点鎖線で示すように、ブラケット(25)の取付部の中央部としてもよく、このようにすれば、補強部材(27)は、横連結杆(４)のほぼ中央に位置し、ガススプリング(21)の荷重を効果的に受けることができる。
この際、補強部材(27)の左右寸法を、ブラケット(25)取付用の左右のボルト(24)(24)間の寸法とほぼ等しくすれば、補強部材(27)の左右位置を、２本のボルト(24)により容易に位置決めすることができ、かつ左右方向に移動するのも防止される。
In the above embodiment, the fitting position of the reinforcing member (27) is set slightly to the right of the center of the lateral coupling rod (4). However, as shown by the two-dot chain line in FIG. In this way, the reinforcing member (27) is positioned substantially at the center of the lateral coupling rod (4) and can effectively receive the load of the gas spring (21). it can.
At this time, if the left and right dimensions of the reinforcing member (27) are substantially equal to the dimensions between the left and right bolts (24) and (24) for mounting the bracket (25), the left and right positions of the reinforcing member (27) are The bolt (24) can be easily positioned and is prevented from moving in the left-right direction.
上記実施形態では、横連結杆(４)を角管状としているが、円形、楕円形、もしくは四角形以上の多角形断面等の管状としてもよく、この際にも、それらの中空孔と、補強部材(27)との断面形状を補形をなすようにすればよい。 In the above embodiment, the lateral coupling rod (4) has a rectangular tube shape, but it may have a circular shape, an elliptical shape, or a tubular shape having a polygonal cross section of a quadrangle or more. The cross-sectional shape with (27) may be complementary.
また、上記実施形態では、短寸の１個の補強部材(27)を横連結杆(4)に嵌入しているが、ブラケット(25)の取付部近傍の左方にも、上記と同様の補強部材を、左方のボルト(24)と当接するように嵌入したり、上記補強部材(27)よりも長寸とした補強部材を嵌入したりしてもよい。 Further, in the above embodiment, one short reinforcing member (27) is fitted into the lateral coupling rod (4), but the same as the above also on the left side in the vicinity of the mounting portion of the bracket (25). The reinforcing member may be inserted so as to contact the left bolt (24), or a reinforcing member longer than the reinforcing member (27) may be inserted.
(１)支持フレーム
(２)脚体
(2a)ベース脚
(2b)脚柱
(2c)アジャスタ
(３)支持杆
(４)(５）横連結杆
(６)天板支持体
(７)平行リンク機構
(８)軸受部
(９)第１リンクアーム
(10)上向突部
(11)枢軸
(12)第２リンクアーム
(13)軸
(14)昇降体
(15)連結杆
(16)天板
(17)ブラケット
(18)軸
(19)補助天板
(20)脚杆
(21)(21)ガススプリング
(23)ブラケット
(24)ボルト
(25)ブラケット
(26)枢軸
(27)補強部材
(28)突条
(29)挿通孔
(30)連結軸
(1) Support frame
(2) Leg
(2a) Base leg
(2b) pedestal
(2c) Adjuster
(3) Support rod
(4) (5) Horizontal connection rod
(6) Top plate support
(7) Parallel link mechanism
(8) Bearing part
(9) First link arm
(10) Upward projection
(11) Axis
(12) Second link arm
(13) Axis
(14) Elevator
(15) Linkage
(16) Top plate
(17) Bracket
(18) axis
(19) Auxiliary top plate
(20) Footpad
(21) (21) Gas spring
(23) Bracket
(24) Bolt
(25) Bracket
(26) Axis
(27) Reinforcing member
(28) Projections
(29) Insertion hole
(30) Connecting shaft
Claims (5)
A bracket that pivotally attaches the rear end of the gas spring is fixed to the horizontal connecting rod with a bolt that protrudes into the hollow hole of the horizontal connecting rod, and the side of the reinforcing member is brought into contact with the tip of the bolt. The desk according to any one of claims 1 to 4.
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| JP2006243820A JP4833002B2 (en) | 2006-09-08 | 2006-09-08 | desk |
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| JP4833002B2 true JP4833002B2 (en) | 2011-12-07 |
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