JP2015054188A - Leg part-extending and shortening structure, and table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a leg part-extending and shortening structure capable of achieving a stable structure.SOLUTION: A leg part 30 comprises an upper leg body 40 and an intermediate leg body 50. The upper leg body 40 has an outer shape larger than that of the intermediate leg body 50. The upper leg body 40 is formed into a tubular shape, is opened at an end part on the side facing the intermediate leg body 50 and has a shape where a tubular inner surface comes into contact with an outer surface of the intermediate body 50 at three or more points when including the intermediate leg body 50. The leg part 30 is shortened by inclusion of the intermediate leg body 50 in the upper leg body 40. The leg part 30 is extended by placing the upper leg body 40 on the intermediate leg body 50 in such a manner that a lower end part of the upper leg body 40 comes into contact with the intermediate leg body 50 at three or more points.

Description

  The present invention relates to a leg stretchable structure and a table capable of stretching the leg.

  Conventionally, as a table capable of changing the height from the floor surface to the top plate, there is one described in Patent Document 1, for example. The table described in Patent Document 1 includes a top plate, a base plate, an intermediate leg attached to the top plate, and an intermediate leg attached to the base plate. This table becomes a high table by overlapping the top plate and the base plate so that the positions of the intermediate leg on the top plate side and the intermediate leg on the base plate side coincide with each other. Further, the table is lowered in height by shifting the positions of the intermediate leg on the top plate side and the intermediate leg on the base plate side and overlapping the top plate and the main plate.

Utility Model Registration No. 3144444

  In the table described in Patent Document 1, in order to support the top plate in a stable state, it is necessary to arrange a plurality of intermediate legs on the peripheral edge of the top board, and further connected to the intermediate leg on the celestial body side. It is necessary to increase the size of the main plate, which is inconvenient. In addition, a joiner is separately required to prevent a positional deviation between the intermediate leg on the top plate side and the ground plate.

  Accordingly, an object of the present invention is to provide a leg stretchable structure capable of realizing a stable structure, and a table having this stretchable structure and a stable structure with a small number of legs.

  The leg stretchable structure according to one aspect of the present invention includes a leg disposed at an upper portion and a leg disposed at a lower portion. One of the legs arranged at the upper part and the legs arranged at the lower part has a larger outer shape than the other leg, and one leg having a larger outer shape is formed in a cylindrical shape. In addition, the end on the side facing the other leg having a small outer shape is opened, and when the other leg is included, the cylindrical inner surface and the outer surface of the other leg abut at three or more points. Has a shape. In this stretchable structure, a shortened state is formed when one leg includes the other leg. In addition, the other leg and one leg are rotated relative to each other around the line along the fitting direction when the other leg is included in the one leg, and the open side of the one leg is opened. One leg is placed on the other leg or the other leg is placed on the other leg so that the end of the leg abuts the other leg at three or more points. Is formed.

  In this stretchable structure, in a shortened state, the positions of the legs are determined by the outer surface of the other leg having a small outer shape coming into contact with the inner surface of the one leg having a large outer shape at three or more points. There is no need to separately provide fixing means for fixing each other. Further, when this telescopic structure is applied to the table leg, as described above, the positions of the legs are determined in the shortened state, so that only the one leg is provided at the center of the table, the top plate Even if a biased load is applied to the edge of the plate, it is difficult to turn over and it becomes a stable table.

  The legs arranged in the upper part and the legs arranged in the lower part may have similar external shapes in the horizontal cross section. In this case, in the shortened state, the outer surface of the other leg is in contact with the inner surface of the one leg, so that they are positioned more firmly and stable. Further, when the legs are placed, it is easy to align the centers of the legs. Furthermore, the other leg having a small outer shape is prevented from rotating in the one leg.

  At least one of the leg disposed at the upper part and the leg disposed at the lower part may have an elliptical shape, an oval shape, or a polygonal shape in a horizontal cross section. In this case, the leg stretchable structure can be realized by using a leg having such an outer shape.

  A first recess is formed at each of the lower end of the leg disposed at the upper portion and the upper end of the leg disposed at the lower portion, and the first recess and the lower portion of the leg disposed at the upper portion in the extended state. You may make it fit with the 1st recessed part of the leg body arrange | positioned. In this case, in the extended state, the legs are positioned only by fitting the first recesses, without providing a fixing means for fixing the legs other than the first recess, The legs can be connected more firmly. Further, when this telescopic structure is applied to the leg portion of the table, even in the extended state, even if a load that is biased to the edge of the top plate is applied, it is difficult to turn over and a stable table is obtained.

  A second recess having a depth different from that of the first recess is further formed at the lower end of the leg disposed at the upper portion and the upper end of the leg disposed at the lower portion. Instead of fitting one concave portion, the second concave portion of the leg disposed at the upper portion and the second concave portion of the leg disposed at the lower portion may be fitted. In this case, by fitting the second recesses, the fitting depth is different from that when the first recesses are fitted. Thereby, in the expansion | extension state, the whole length of the leg parts to fit can be made into the length different from the state to which the 1st recessed parts are fitting.

  A table according to another aspect of the present invention is a table including a leg portion having the above-described leg stretchable structure, and has one leg portion, and is provided at the upper end of the leg body arranged at the top. The top plate is fixed, and the base plate is fixed to the lower end of the leg arranged at the bottom. Since this table is provided with the legs having the above-mentioned telescopic structure, even if only one leg is used, the table is stable. Moreover, since there is one leg, the foot space of the table can be widened.

  In the above table, the leg portion may be composed of three or more legs. In this case, a plurality of table heights can be set according to the number of legs to be stacked between the state with the highest height and the state with the lowest height. Here, a table having legs formed by two legs and a table having legs formed by three legs are compared. The highest height and the lowest height of the two tables are the same. In this state, when three legs are provided, the fitting depth is increased when the first recesses of the legs are fitted to each other, compared to the case where two legs are provided. Can do. For example, in a table having two legs, if the fitting depth between the recesses of the legs is increased, the height of the table is lowered. Therefore, in order to secure the height, the height of the legs is increased. And the table cannot be lowered in the shortened state. In this way, by configuring the leg portion with three or more legs, the legs can be firmly fitted to each other while ensuring the height difference of the tables, and the table becomes more stable.

  In the above table, the leg disposed at the lowermost part may be the other leg having a small outer shape. In this case, the foot space of the table can be further increased.

  The legs constituting the legs may have the same height. In this case, the length of the leg can be shortened most in the shortened state. Thereby, the height difference between the case where the leg part of the table is shortened and the case where it is extended can be increased.

  According to one aspect of the present invention, it is possible to provide a leg stretchable structure capable of realizing a stable structure. Further, according to another aspect of the present invention, it is possible to provide a table having a stable structure with a small number of legs.

It is a perspective view in the expansion state of the round table concerning one embodiment. It is a disassembled perspective view of the round table shown in FIG. FIG. 3 is a view of the round table shown in FIG. 2 as viewed in the direction of arrow A. FIG. 3 is a view of the round table shown in FIG. It is sectional drawing along the VV line of FIG. It is sectional drawing along the VI-VI line of FIG. It is a perspective view in the shortened state of the round table shown in FIG. It is sectional drawing of the horizontal direction of the leg part in a shortened state. It is a disassembled perspective view of the round table which concerns on a modification. It is a perspective view in the expansion state of the round table shown in FIG. It is a perspective view in the expansion state of the round table shown in FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIGS. 1 to 4, the round table 1 includes a top plate 10, a base plate 20, and leg portions 30. The top plate 10 is a circular plate and is located at the top of the round table 1. The base plate 20 is a circular plate and has a smaller diameter than the top plate 10. The base plate 20 is located at the lowermost part of the round table 1 and supports the round table 1 so that it does not fall down.

  The top plate 10 and the base plate 20 are connected by a single leg 30. The leg 30 connects the center position of the lower surface of the top plate 10 and the center position of the upper surface of the base plate 20. The leg part 30 has a telescopic structure. FIG. 1 shows the round table 1 in a state in which the legs 30 are extended to be in an extended state. In addition, the round table 1 which shortened the leg part 30 by shortening is shown in below-mentioned FIG.

  The leg 30 includes an upper leg 40, an intermediate leg 50, and a lower leg 60. The upper end of the upper leg 40 is fixed to the center position of the lower surface of the top plate 10. The upper leg 40 and the top plate 10 may be fixed using screws inserted from the top surface of the top plate 10 or may be fixed by an appropriate method such as fixing using an L-shaped angle. it can. The lower end of the lower leg 60 is fixed to the center position of the upper surface of the base plate 20. Similarly to the case where the upper end of the upper leg 40 is fixed to the top plate 10, the lower leg 60 can be fixed to the upper surface of the base plate 20 by an appropriate method.

  The upper leg 40 has a larger outer shape than the intermediate leg 50 connected downward in the extended state of the leg 30. The upper leg 40 is formed in a cylindrical shape, and has a frame shape with a rectangular horizontal cross section. The upper leg 40 is open at the end (lower end) facing the intermediate leg 50 when the leg 30 is extended. The upper leg 40 is formed, for example, by assembling four plates into a frame shape. At the lower end of the upper leg 40, a pair of long sides is provided with two concave portions (first concave portions) 41 for each side.

  The intermediate leg 50 has a larger outer shape than the lower leg 60 connected to the lower side in the extended state of the leg 30. The intermediate leg 50 is formed in a cylindrical shape and has a frame shape with a rectangular horizontal cross section. The intermediate leg 50 is open at the end (lower end) facing the lower leg 60 when the leg 30 is extended. The intermediate leg 50 is formed, for example, by assembling four plates into a frame shape. At the upper end of the intermediate leg 50, two pairs of recesses (first recesses) 51 are provided for each side on a pair of sides that are long sides. At the lower end of the intermediate leg 50, two pairs of concave portions (first concave portions) 52 are provided on each pair of long sides.

  The lower leg 60 is formed in a cylindrical shape, and has a frame shape with a rectangular horizontal cross section. The lower leg 60 is formed, for example, by assembling four plates into a frame shape. At the upper end of the lower leg 60, a pair of long sides is provided with two recesses (first recesses) 61 for each side.

  The upper leg body 40, the intermediate leg body 50, and the lower leg body 60 are similar to each other. The heights of the upper leg 40, the intermediate leg 50, and the lower leg 60 are equal to each other.

  First, the case where the leg part 30 is made into the expansion | extension state is demonstrated. As shown in FIG. 1, the intermediate leg body (one leg body) 50 and the lower leg body (the other leg body) 60 are in contact with each other at three or more points (four points in the present embodiment). 50 is placed on the lower leg 60. Here, in the lower leg body 60, a recess 61 is provided at a contact position with the intermediate leg body 50. Similarly, in the intermediate leg 50, a concave portion 52 is provided at a contact position with the lower leg 60. Thereby, when the intermediate leg 50 is placed on the lower leg 60, the recess 52 of the intermediate leg 50 and the recess 61 of the lower leg 60 are fitted together.

  5, when the intermediate leg 50 is placed on the lower leg 60, the long side of the rectangular frame shape in the intermediate leg 50 and the long side of the rectangular frame shape in the lower leg 60 The intermediate leg 50 and the lower leg 60 are arranged so that they are orthogonal to each other. Further, the intermediate leg 50 is placed on the lower leg 60 so that the centers of the intermediate leg 50 and the lower leg 60 coincide with each other.

  Further, when the leg portion 30 is in the extended state, the upper leg body (one leg body) 40 and the intermediate leg body (the other leg body) 50 come into contact with each other at three or more points (four points in this embodiment). Next, the upper leg 40 is placed on the intermediate leg 50. Here, in the intermediate leg 50, a recess 51 is provided at a position where the intermediate leg 50 contacts the upper leg 40. Similarly, in the upper leg 40, a recess 42 is provided at a position where the upper leg 40 contacts the intermediate leg 50. Thereby, when the upper leg 40 is placed on the intermediate leg 50, the recess 41 of the upper leg 40 and the recess 51 of the intermediate leg 50 are fitted together.

  As shown in FIG. 6, when the upper leg 40 is placed on the intermediate leg 50, the long side of the rectangular frame shape in the upper leg 40 and the long side of the rectangular frame shape in the intermediate leg 50 The upper leg 40 and the intermediate leg 50 are arranged so that they are orthogonal to each other. Further, the upper leg 40 is placed on the intermediate leg 50 so that the centers of the upper leg 40 and the intermediate leg 50 coincide with each other.

  In this way, the intermediate leg 50 is placed on the lower leg 60 while fitting the recesses to each other, and the upper leg 40 is placed on the intermediate leg 50 while fitting the recesses to each other. The extended state of the part 30 is formed. When the leg 30 is in the extended state, for example, the length of each leg of the leg 30 can be set so that the height of the round table 1 is 700 mm.

  Next, the case where the leg part 30 is made into a shortened state is demonstrated. As shown in FIGS. 7 and 8, the upper leg body 40 can include an intermediate leg body 50. Specifically, the upper leg 40 and the intermediate leg 50 are arranged so that the long side of the rectangular frame shape in the upper leg 40 and the long side of the rectangular frame shape in the intermediate leg 50 are parallel to each other. The intermediate leg 50 is fitted into the upper leg 40 from the lower end side of the upper leg 40. When the upper leg 40 includes the intermediate leg 50, the cylindrical inner surface of the upper leg 40 and the outer surface of the intermediate leg 50 can come into contact at three or more points. In the present embodiment, since the upper leg 40 and the intermediate leg 50 are similar in shape, the cylindrical inner surface of the upper leg 40 and the outer surface of the intermediate leg 50 abut on the surface.

  Similarly, the intermediate leg 50 can include the lower leg 60. Specifically, the intermediate leg 50 and the lower leg 60 are arranged so that the long side of the rectangular frame shape in the intermediate leg 50 and the long side of the rectangular frame shape in the lower leg 60 are parallel to each other. The lower leg 60 is inserted into the intermediate leg 50 from the lower end side of the intermediate leg 50. When the intermediate leg 50 encloses the lower leg 60, the cylindrical inner surface of the intermediate leg 50 and the outer surface of the lower leg 60 can come into contact at three or more points. In the present embodiment, since the intermediate leg 50 and the lower leg 60 are similar in shape, the cylindrical inner surface of the intermediate leg 50 and the outer surface of the lower leg 60 abut against each other.

  When the leg 30 is shortened, the upper leg 40, the intermediate leg 50 and the lower leg 60 are at the same height, so that the upper ends of the upper leg 40, the intermediate leg 50 and the lower leg 60 are The upper legs 40, the intermediate legs 50, and the lower legs 60 are in contact with the lower surface of the base plate 20. The length of the leg 30 in the shortened state (the length between the top plate 10 and the base plate 20) is the height of the upper leg 40 (or the intermediate leg 50 or the lower leg 60). When the leg 30 is in a shortened state, the length of each part of the leg 30 can be set so that the height of the round table 1 is 350 mm, for example.

  Here, the case where the leg part 30 is switched between the extended state and the shortened state will be described. When the upper leg 40 and the intermediate leg 50 are switched between the extended state and the shortened state, a line along the fitting direction when the intermediate leg 50 is included in the upper leg 40 is indicated by the rotation axis L (FIGS. 2 and 5). 6 and 8), the upper leg 40 and the intermediate leg 50 are rotated relative to each other. Then, the long side of the rectangular frame shape of the upper leg 40 and the long side of the rectangular frame shape of the intermediate leg 50 are orthogonal to each other, and the upper leg 40 is placed on the intermediate leg 50 to extend. A state is formed. Further, the long side of the rectangular frame shape in the upper leg 40 and the long side of the rectangular frame shape in the intermediate leg 50 are arranged in parallel to each other, and the intermediate leg 50 is placed in the upper leg 40. A shortened state is formed by encapsulating in the.

  Similarly, when the intermediate leg 50 and the lower leg 60 are switched between the extended state and the shortened state, the intermediate leg is set with the line along the fitting direction when the lower leg 60 is included in the intermediate leg 50 as the rotation axis L. The body 50 and the lower leg 60 are rotated relative to each other. Then, the long side of the rectangular frame shape of the intermediate leg 50 and the long side of the rectangular frame shape of the lower leg 60 are orthogonal to each other, and the intermediate leg 50 is placed on the lower leg 60 so as to extend. A state is formed. Further, the long side of the rectangular frame shape in the intermediate leg 50 and the long side of the rectangular frame shape in the lower leg 60 are arranged so as to be parallel to each other, and the lower leg 60 is placed in the intermediate leg 50. A shortened state is formed by encapsulating in the.

  The present embodiment is configured as described above, and in the telescopic structure applied to the leg portion 30, the outer surface of the lower leg body 60 abuts the inner surface of the intermediate leg body 50 at three or more points in the shortened state. Since the positions of the legs are determined by the outer surfaces of the legs 50 coming into contact with the inner surfaces of the upper legs 40 at three or more points, there is no need to separately provide a fixing means for fixing the legs. In addition, since the positions of the legs are determined in the shortened state of the leg 30, even if a load that is biased to the edge of the top 10 is applied only by providing one leg 30 at the center of the top 10. It is difficult to turn over, and it becomes a stable round table 1. Moreover, since there is one leg, the foot space of the table can be widened.

  The upper leg 40, the intermediate leg 50, and the lower leg 60 are similar to each other. For this reason, in the shortened state of the leg 30, the outer surface of the lower leg 60 abuts on the inner surface of the intermediate leg 50, and the outer surface of the intermediate leg 50 abuts the inner surface of the upper leg 40 on the surface. Further, the legs are positioned more firmly, and the round table 1 becomes stable. Further, when the intermediate leg 50 is placed on the lower leg 60 and when the upper leg 40 is placed on the intermediate leg 50, the legs are similar to each other, so that the centers of the legs are the same. It becomes easy to align. Further, the lower leg 60 included in the intermediate leg 50 is prevented from rotating in the intermediate leg 50. Similarly, the intermediate leg 50 included in the upper leg 40 is prevented from rotating in the upper leg 40.

  In the extended state of the leg 30, the recess 41 of the upper leg 40 and the recess 51 of the intermediate leg 50 are fitted, and the recess 52 of the intermediate leg 50 and the recess 61 of the lower leg 60 are fitted. In this case, the positioning of the upper leg 40 and the intermediate leg 50 and the positioning of the intermediate leg 50 and the lower leg 60 are performed simply by fitting the recesses, and these recesses 41, 51, Legs can be more firmly connected without separately providing a fixing means for fixing the legs other than 52 and 61. Further, in the extended state of the leg portion 30, even when a biased load acts on the edge of the top plate 10, it is difficult to turn over and the stable round table 1 is obtained.

  Here, the round table which has the leg part comprised by two legs, and the leg part comprised by three legs (the upper leg 40, the intermediate leg 50, and the lower leg 60) like embodiment. A round table 1 having 30 is compared. The highest height and the lowest height of the two round tables are the same. In this state, when there are three legs as in the embodiment, when the recesses (such as the recesses 41) of the legs are fitted together, compared to the case where there are two legs. The fitting depth can be increased. For example, in a round table having two legs, if the fitting depth between the recesses of the legs is increased, the height of the table is lowered. It is necessary to increase the height, and the round table cannot be lowered in the shortened state. Thus, by constituting the leg portion 30 with three or more legs as in the embodiment, the legs can be firmly fitted to each other while ensuring the height difference of the tables, and a more stable round shape. It becomes table 1.

  The leg disposed at the lowermost part of the leg 30 is the lower leg 60 having a small outer shape, so that the foot space of the round table 1 can be further widened.

  The upper leg 40, the intermediate leg 50, and the lower leg 60 constituting the leg 30 are set to the same height. In this case, when the leg part 30 is shortened, the length of the leg part 30 can be shortened most. Thereby, the height difference between the case where the leg part 30 of the round table 1 is shortened and the case where it is extended can be increased.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, the intermediate leg 50 is placed on the lower leg 60 and the upper leg 40 is further placed on the intermediate leg 50, but the lower leg 60 is included in the intermediate leg 50. In the state, the upper leg 40 may be placed on the intermediate leg 50. Moreover, although the leg part 30 was comprised by three legs, the upper leg 40, the intermediate leg 50, and the lower leg 60, you may comprise by four or more legs. Thus, by configuring the leg 30 with three or more legs, the height of the round table 1 can be set by changing the number of legs to be stacked.

  Next, a modification example in which the length of the leg portion in the extended state can be changed will be described. As shown in FIG. 9, the round table 1 </ b> A has an intermediate leg 50 </ b> A having a different configuration from the intermediate leg 50 of the round table 1 in the embodiment, and the other configurations are the same as the round table 1 in the embodiment. It is. As shown in FIG. 9, the intermediate leg 50 </ b> A is provided with a concave portion 51 and a concave portion 52, similar to the intermediate leg 50. Further, the intermediate leg 50 </ b> A is provided with a recess (second recess) 53 having a depth deeper than the recess 51, adjacent to the recess 51. The intermediate leg 50 </ b> A is provided with a recess (second recess) 54 that is adjacent to the recess 52 and deeper than the recess 52.

  The concave portion 51 and the concave portion 54 have the same position in the height direction. Further, the concave portion 52 and the concave portion 53 have the same position in the height direction. Accordingly, the upper and lower portions of the intermediate leg 50A are changed so that the concave portion 54 is directed upward, so that the concave portion 41 of the upper leg 40 and the concave portion 54 of the intermediate leg 50A are fitted, and the concave portion 53 of the intermediate leg 50A is fitted. And the recess 61 of the lower leg 60 can be fitted.

  For example, as shown in FIG. 10, similarly to the round table 1 in the embodiment, the recess 41 of the upper leg 40 and the recess 51 of the intermediate leg 50A are fitted, and the recess 52 and the lower leg of the intermediate leg 50A are fitted. The recess 61 of the body 60 is fitted. When the length of the intermediate leg 50A is changed in the extended state of the leg portion 30, as shown in FIG. 11, the upper and lower legs of the intermediate leg 50A are changed so that the concave portion 54 side is directed upward. The recess 41 of 40 and the recess 54 of the intermediate leg 50A are fitted, and the recess 53 of the intermediate leg 50A and the recess 61 of the lower leg 60 are fitted. In this manner, by fitting the recess 41 of the upper leg 40 and the recess 61 of the lower leg 60 into the deep recesses 54 and 53, the height of the round table 1A is higher than that shown in FIG. Becomes lower.

  As described above, the overall length of the leg 30 is changed by providing the intermediate leg 50A with the recess 53 and the recess 54 having different depths from the recess 51 and the recess 52 and switching the recess to be fitted. The height of the round table 1A can be easily changed.

  Moreover, in the said embodiment and modification, although the upper leg 40, the intermediate leg 50, the intermediate leg 50A, and the lower leg 60 which comprise the leg part 30 shall have a rectangular frame shape, other than this. It may be a shape. For example, the outer shape in the horizontal section may be an ellipse, an ellipse, or a polygon. In this case, the expansion / contraction structure of the leg part 30 is realizable using the leg body which has such an external shape.

  Moreover, you may connect the upper leg 40 and the intermediate leg 50, and the intermediate leg 50 and the lower leg 60 using a screw | thread. In this case, the legs can be connected more firmly. For example, when connecting the legs, the legs can be connected from the inside of the frame-shaped legs using screws. Moreover, a hand can be put in from the hole provided in the center part of the base board 20, and legs can be connected using a screw from the inner side of a leg. By connecting the legs using screws from the inside of the legs, the screws are not exposed to the outside and the design is good.

  Moreover, in the said embodiment and modification, although the leg part 30 which has an expansion-contraction structure was applied to the round table 1, it can also apply to things other than the round table 1, such as a chair which can change height. Moreover, you may apply the leg part 30 to the table which has not only the round table 1 with the round top plate 10 but other top plate shapes, such as a rectangle.

  DESCRIPTION OF SYMBOLS 1,1A ... Round table, 10 ... Top plate, 20 ... Base plate, 30 ... Leg part, 40 ... Upper leg body (leg body arrange | positioned at the uppermost part), 41 ... Recessed part (1st recessed part), 50, 50A ... Intermediate leg, 51, 52 ... Recess (first recess), 53, 54 ... Recess (second recess), 60 ... Lower leg (leg placed at the bottom), 61 ... Recess ( First recess).

Claims (9)

A leg disposed at the top and a leg disposed at the bottom,
One of the legs disposed on the upper part and the legs disposed on the lower part has a larger outer shape than the other leg.
The one leg having a large outer shape is formed in a cylindrical shape, and the end on the side facing the other leg having a small outer shape is opened, and the one leg has a cylindrical shape when the other leg is included. The inner surface and the outer surface of the other leg are in contact with each other at three or more points,
A shortened state is formed by the one leg including the other leg,
The other leg and the one leg are rotated relative to each other about the line along the fitting direction when the other leg is contained in the one leg, and the one leg is opened. The one leg is placed on the other leg or the other leg is placed on the one leg so that the end on the formed side abuts the other leg at three or more points. Stretchable structure of the leg, which is formed in an extended state by being placed on the base.   The leg stretchable structure according to claim 1, wherein the legs arranged in the upper part and the legs arranged in the lower part are similar in shape to each other in horizontal cross section.   The leg part according to claim 1 or 2, wherein at least one of the leg body arranged at the upper part and the leg body arranged at the lower part has an elliptical, oval or polygonal outer shape in a horizontal section. Telescopic structure. A first recess is formed at each of the lower end of the leg disposed at the upper part and the upper end of the leg disposed at the lower part,
The said 1st recessed part of the leg body arrange | positioned in the said upper part and the said 1st recessed part of the leg body arrange | positioned in the lower part fit in the said expansion | extension state. Stretch structure of the leg part as described in. A second recess having a depth different from that of the first recess is further formed at the lower end of the leg disposed at the upper part and the upper end of the leg disposed at the lower part,
In the extended state, instead of fitting the first recesses, the second recesses of the legs disposed in the upper part and the second recesses of the legs disposed in the lower part are fitted. The stretchable structure of the leg part according to claim 4, wherein A table comprising a leg portion having the leg stretchable structure according to any one of claims 1 to 5,
The leg is one,
A top plate is fixed to the upper end of the leg arranged at the top,
A table in which a base plate is fixed to the lower end of the leg arranged at the lowest part.   The table according to claim 6, wherein the leg portion is constituted by three or more legs.   The table according to claim 6 or 7, wherein the lowermost leg is the other leg having the small outer shape.   The table according to any one of claims 6 to 8, wherein the legs constituting the leg portions have the same height.

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