JP2020089461A - Fall prevention stopper and furniture with the same - Google Patents

Abstract

To provide a fall prevention stopper that facilitates height adjustment of a leg body for supporting a supported body such as a top plate of a desk or a seat surface of a chair, and provide furniture with the fall prevention stopper.SOLUTION: A desk is provided in which an upper side supporting leg 122 for supporting a top plate is slidably fitted in a pipe-shaped lower side supporting leg 112 standing up from a floor surface through a height adjuster 140. A fall prevention stopper 130 is provided in the lower end of the upper side supporting leg 122. The fall prevention stopper 130 is formed of a fixation mounting part 131, a press fit part 134 and a receiving part 136 in a resin-made cylindrical body, respectively. The fixation mounting part 131 is formed in a substantially cylindrical shape fitted in the lower end of the upper side supporting leg 122. The press fit part 134 includes a cantilevered claw 135 having a contact fitting part 135b for elastically pressing an inner circumferential surface in the lower side supporting leg 112. Also, the fall prevention stopper 130 is provided with the receiving part 136 inside of the press fit part 134.SELECTED DRAWING: Figure 17

Description

The present invention prevents falling of an upper support leg in a leg supported by a lower support leg and an upper support leg that slidably fit supported objects such as a tabletop of a desk or a seating surface of a chair. The present invention relates to a fall prevention stopper and a furniture including the fall prevention stopper.

2. Description of the Related Art Conventionally, there is a leg body that supports a supported body such as a tabletop of a desk or a seating surface of a chair by a lower support leg and an upper support leg that are slidably fitted together. For example, in Patent Document 1 below, the height of a leg for a chair in which a cylinder as an upper support leg that supports a seat surface is slidably fitted in a cylinder as a lower support leg that stands up from the floor surface. A height adjustment mechanism is disclosed.

JP-A-58-82150

However, in the leg body for a chair disclosed in Patent Document 1, when the upper support leg is slidable with respect to the lower support leg when the height of the seat surface is adjusted, the upper support leg is However, there is a problem that it is difficult to perform height adjustment work because it becomes a free state where it can freely fall due to its own weight.

The present invention has been made to address the above problems, and an object thereof is to prevent falling, which can facilitate height adjustment of legs supporting a supported object such as a desk top or a seating surface of a chair. It is to provide a furniture including a stopper and the same fall prevention stopper.

In order to achieve the above-mentioned object, a feature of the present invention is that a pipe-shaped upper support leg is slidably fitted to a pipe-shaped lower support leg standing upright from an installation surface, and A fall prevention stopper for preventing the upper support leg from falling in an extendable leg that supports a supported body, which is one of the upper support leg and the lower support leg that are fitted to each other It is located outside of the upper support leg and the lower support leg that are formed by extending on the side opposite to the tip of the fixed mounting part and are fitted into each other, and are fitted and fitted in the end part. And a pressing fitting portion that is inserted into the support leg and slidably fits while pressing the inner peripheral surface of the support leg.

According to the features of the present invention configured as described above, the fall prevention stopper includes the fixed mounting portion in the end of the supporting leg located inside the upper supporting leg and the lower supporting leg that are fitted with each other. The pressing fitting portion is fitted into the end portion of the supporting leg that is attached and is located outside of the upper supporting leg and the lower supporting leg, and presses the inside of the supporting leg. As a result, in the fall prevention stopper according to the present invention, the press fitting portion is fitted even when the upper support leg is slidable with respect to the lower support leg when the height of the supported body is adjusted. Since the sliding resistance is increased by pressing the inner peripheral surface of the combined upper support leg or the lower support leg, the upper support leg can be prevented from falling and the height of the leg can be easily adjusted.

Another feature of the present invention is that, in the fall prevention stopper, the fixed attachment portion is formed into a cylindrical shape that fits into the supporting leg located inside the cylindrical shape. The portion is provided with at least two claws that are arranged along the circumferential direction of the inner peripheral surface of the support leg that is formed in a cylindrical shape and that is located outside and that extends in a cantilever shape from the fixed mounting portion side. It is in.

According to another feature of the present invention configured as described above, the fall prevention stopper is arranged along the circumferential direction of the inner peripheral surface of the support leg having the pressing fitting portion formed in a cylindrical shape and located outside. In addition, since at least two claws extending in a cantilever shape from the fixed mounting portion side are provided, the inner peripheral surface in the support leg can be pressed stably and continuously by elastic deformation of these claws. it can.

Another feature of the present invention is that, in the fall prevention stopper, the claw body extends from the fixed mounting portion side in a plate shape, and the tip end portion of the arm portion projects radially outward of the pressing fitting portion. The contact fitting portion has a hook-shaped overhanging portion that extends radially outward from the tip of the arm portion in a hook-like shape, and gradually contacts the hook-like overhanging portion. It has a curved surface that reduces the amount of overhang.

According to another feature of the present invention configured in this way, the fall prevention stopper is a hook-shaped tension member that extends radially outward from the tip end of the arm portion that extends like a plate from the fixed attachment portion side in a hook shape. Since it has a protrusion and a contact fitting portion composed of a curved surface whose amount of protrusion gradually decreases downward from the hook-shaped protrusion, the inside of the upper support leg or the lower support leg is It is easy to insert into and the pressing force can be prevented from decreasing even when the contact fitting portion is worn.

Another feature of the present invention resides in that the fall prevention stopper further includes an intermediate erection portion erected in a radial direction on an inner peripheral portion between the fixed attachment portion and the press fitting portion.

According to another feature of the present invention configured as described above, the fall prevention stopper includes an intermediate erection portion radially erected on an inner peripheral portion between the fixed attachment portion and the pressure fitting portion. The rigidity of the entire fall prevention stopper can be improved.

Another feature of the present invention is that the fall prevention stopper further includes a fixed-side erection portion that is erected between the inner peripheral portions of the fixed attachment portion while being connected to the intermediate erection portion.

According to another feature of the present invention configured in this manner, the fall prevention stopper includes the fixed-side erection portion erected between the inner peripheral portions of the fixed attachment portion in a state of being connected to the intermediate erection portion, The rigidity of the fixed mounting portion can be improved.

Further, another feature of the present invention is that, in the fall prevention stopper, the stopper is provided inside the pressing fitting portion, extends downward from the intermediate erection portion, and protrudes from a lower end portion of the pressing fitting portion. It is to provide the receiving part.

According to another feature of the present invention thus configured, the fall prevention stopper is provided inside the pressing fitting portion, extends downward from the intermediate erection portion, and projects from the lower end portion of the pressing fitting portion. Since the upper support leg is displaced to the lower slide limit position, the pressure fitting part does not directly collide with the structure inside the lower support leg and is damaged because it has the receiving part formed by can do. Further, in this case, the fall prevention stopper is provided with the fixed-side erection portion, so that when the upper support leg is displaced to the lower slide limit position and the receiving portion directly collides with a component inside the lower support leg. It is possible to prevent the intermediate erection portion from breaking.

Further, the present invention can be carried out not only as an invention of a height adjusting mechanism but also as an invention of a furniture provided with this height adjusting mechanism.

Specifically, the furniture is hung from a pipe-shaped lower support leg that stands up from the installation surface and a supported body supported above the lower support leg and slides to the outside or the inside of the lower support leg. A fixture with a pipe-shaped upper support leg that movably fits and a height adjuster that adjusts the height of the supported body by adjusting the amount of insertion of the lower support leg and the upper support leg. Therefore, the drop prevention stopper according to any one of claims 1 to 6 may be provided. With this, the same effect as that of the height adjusting mechanism can be expected.

In this case, in the furniture, the supported object may be a top plate of a desk. That is, the furniture can be configured as a desk.

Further, in this case, in the furniture, the supported body may be a seat plate that constitutes a seat surface of the chair. That is, the furniture can be configured as a chair.

In addition to the desk and chair, the furniture can be composed of a whiteboard, a tripod, a microphone stand, or the like.

It is a perspective view which shows the outline of the external appearance structure which looked at the desk provided with the fall prevention stopper which concerns on one Embodiment of this invention from the diagonal direction. It is an exploded perspective view which showed the outline of the external appearance structure of the main components of the desk shown in FIG. It is a perspective view which shows the outline of an external appearance structure which looked at the fall prevention stopper attached to the desk shown in FIG. 2 from the diagonal direction. 3A and 3B schematically show the external configuration of the fall prevention stopper shown in FIG. 3, FIG. 6A is a perspective view of the fall prevention stopper as seen obliquely from above, and FIG. It is the perspective view which looked at a stopper from diagonally downward which is the opposite direction of (A). It is a partially expanded sectional view which shows the state which the fall prevention stopper shown in FIG. FIG. 4 is a partially enlarged perspective view showing a state in which the fall prevention stopper shown in FIG. 3 abuts against the inner peripheral surface of the foot in the lower support. It is a perspective view which shows the outline of an external appearance structure which looked at the stopper plate which comprises the desk shown in FIG. 2 from the diagonal direction. (A), (B) is showing the outline of the external appearance composition of the intermediate cylinder which constitutes the desk shown in Drawing 2, (A) is a perspective view which looked at the intermediate cylinder from the slanting direction, and (B) is ( It is the perspective view which looked at the intermediate cylinder from the opposite direction of A). (A), (B) has shown the outline of the external appearance structure of the inner cylinder which comprises the desk shown in FIG. 2, (A) is the perspective view which looked at the inner cylinder from the diagonal direction, (B) [Fig. 3] is a perspective view of the inner cylinder seen from the direction opposite to (A). It is a perspective view which shows the outline of an external appearance structure seen from diagonally upward of the inner cylinder which comprises the desk shown in FIG. (A), (B) has shown the outline of the external appearance structure of the outer cylinder which comprises the desk shown in FIG. 2, (A) is the perspective view which looked at the outer cylinder from the diagonal direction, (B) [Fig. 3] is a perspective view of the outer cylinder body as seen from the opposite direction to (A). It is a perspective view which shows the outline of an external appearance structure seen from diagonally downward of the outer cylinder which comprises the desk shown in FIG. In order to explain the operation of the height adjuster shown in FIG. 1, an explanatory view showing a cross-sectional state in a free state at the position of the upper elastic pressing portion of the two elastic pressing portions in the height adjusting tool. is there. It is a partial expanded sectional perspective view showing the state before inserting the upper side support leg with which the fall prevention stopper shown in FIG. 2 was attached into the lower side support leg with which the height adjuster was attached. It is a partial expanded sectional perspective view which shows the state which inserts the upper side support leg with which the fall prevention stopper shown in FIG. 2 was attached in the lower side support leg with which the height adjuster was attached. It is a partial expanded sectional perspective view which shows the state which inserted the upper side support leg to which the fall prevention stopper shown in FIG. 2 was attached in the intermediate cylinder in the lower side support leg to which the height adjuster was attached. It is a partial expanded sectional perspective view which shows the state which penetrated the intermediate|middle cylinder in the lower side support leg with which the height adjuster was attached with the upper side support leg with which the fall prevention stopper shown in FIG. 2 was attached. In order to explain the operation of the height adjuster shown in FIG. 1, an explanatory view showing a cross-sectional state in a temporarily fixed state at the position of the upper elastic pressing portion of the two elastic pressing portions in the height adjusting tool. Is. In order to explain the operation of the height adjuster shown in FIG. 1, an explanatory view showing a cross-sectional state in a supported state at the position of the upper elastic pressing portion of the two elastic pressing portions in the height adjusting tool. is there.

Hereinafter, an embodiment of a fall prevention stopper and a furniture including the fall prevention stopper according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an outline of an external configuration of a desk 100 provided with a fall prevention stopper 130 according to an embodiment of the present invention as seen from an oblique direction. In addition, FIG. 2 is an exploded perspective view showing an outline of an external configuration of main parts of the desk 100 shown in FIG. Note that each drawing referred to in this specification may be schematically illustrated by exaggerating some of the constituent elements in order to facilitate understanding of the present invention. And ratios may be different. The fall prevention stopper 130 is used when adjusting the height of the top plate 120 of the desk 100 which is a learning desk used by children and students with a chair (not shown) in a classroom at an educational facility such as an elementary school or a junior high school. This is a part to prevent the drop of the and to facilitate the height adjustment work.

(Structure of desk 100)
The desk 100 mainly includes a base leg 110, a top plate 120, and a height adjusting tool 140, respectively. The base leg 110 is a component for supporting the top plate 120 in a horizontal state at a predetermined height position from the floor surface, and is formed by connecting steel pipe members. Specifically, the base leg 110 is provided in a state in which the lower support legs 112 are vertically erected on the legs 111 made of two pipe members extending in parallel with each other in the front-rear direction of the desk 100, and The two lower support legs 112 are connected to each other by a connecting rod 113. Further, resin caps are fitted on both ends of the two legs 111, respectively.

The two lower support legs 112 are components for supporting upper support legs 122, which will be described later, at a plurality of positions in the height direction, and are made of steel pipe material. Each of the lower support legs 112 has a lower end cut out in a concave shape and is integrally connected to each upper surface of the two legs 111 by welding. Further, a stopper through hole 114, a notch 115 and a stop hole 116 are formed at the upper end portion of each of the lower support legs 112.

The stopper through hole 114 is a portion through which an engagement protrusion 141a formed on a stopper plate 141, which will be described later, penetrates, and is formed as a square hole on the front surface that penetrates inside the lower support leg 112. In the present embodiment, one stopper through hole 114 is formed near the upper end of the lower support leg 112, and another stopper through hole 114 is formed below the stopper through hole 114 at a predetermined interval. That is, two stopper through holes 114 are formed along the vertical direction.

In this case, the distance between the two stopper through holes 114 is the same as the distance between the two engaging protrusions 141 a formed on the stopper plate 141. These two stopper through-holes 114 are formed on the outer peripheral surfaces of the two lower support legs 112 extending in parallel with each other, that is, on the inner peripheral surfaces of the lower support legs 112. There is. Note that these two stopper through holes 114 may be formed on the outer peripheral surface outside the lower support leg 112, and the formation position in the circumferential direction is not limited to this embodiment.

The cutout portion 115 is a portion into which a lock projection engagement portion 142c formed on an intermediate cylinder 142, which will be described later, is fitted, and is formed by cutting out a concave shape from the upper end portion of the lower support leg 112. Three notches 115 are formed in the upper end of the lower support leg 112 along the circumferential direction at predetermined intervals. In this case, the three notches 115 correspond to the three states of the height adjuster 140, that is, the supported state, the temporarily fixed state, and the free state, respectively. The stop holes 116 are through holes for fixing the intermediate cylinder 142 to the lower support leg 112, and are formed at positions opposite to each other in the circumferential direction of the lower support leg 112.

The top plate 120 is a rectangular component that constitutes the top surface of the desk 100 when viewed from above, and is formed by stacking plate-shaped wood. The top plate 120 is provided with one bottom plate 121 and two upper support legs 122, respectively. The bottom plate 121 is a component that is provided below the top plate 120 and that constitutes a storage unit for storing personal items of the user of the desk 100, and is formed in a shape in which three sides of a rectangular steel plate are erected upward. ing. The bottom plate 121 is fixed to the lower surface of the top plate 120 by bolts (not shown) on the raised three sides.

The two upper support legs 122 are components that support the top plate 120 by being inserted into the two lower support legs 112, respectively, and are made of vertically extending steel pipe material. .. In this case, the upper support legs 122 are attached to the top plate 120 while being connected to each other via a U-shaped member 125 formed by bending a steel pipe material in a horizontal direction into a substantially U-shape. It supports the plate 120. A stopper engagement portion 123 and a stop hole 124 are formed in each of the upper support legs 122.

The stopper engagement portion 123 is a portion on which the engagement protrusion 141a of the stopper plate 141 is hooked, and is formed by recessing from the outer surface of the upper support leg 122. In the present embodiment, the stopper engagement portion 123 is formed in a substantially inverted triangular shape in a front view in which the depth gradually increases from the lower side to the upper side of the upper support leg 122. A plurality of stopper engaging portions 123 are formed in a straight line along the vertical direction on the outer peripheral surfaces of the two upper support legs 122 extending in parallel with each other and facing each other.

In this case, the interval between the stopper engaging portions 123 that are vertically adjacent to each other is the same as the interval between the two engaging protrusions 141 a formed on the stopper plate 141. The plurality of stopper engaging portions 123 are respectively formed on the outer peripheral surfaces of the two upper support legs 122 extending in parallel with each other, that is, on the inner peripheral surfaces of the upper support legs 122. .. In the present embodiment, the stopper engaging portion 123 is formed from near the lower end of the upper support leg 122 to near the upper end thereof. The stopper engaging portions 123 may be formed on the outer peripheral surface outside the upper support leg 122, and the formation positions in the circumferential direction are not limited to the present embodiment.

The stopper holes 124 are through holes for fixing the fall prevention stoppers 130 to the tip ends of the upper support legs 122, and are formed at positions on the opposite sides in the circumferential direction of the upper support legs 122, respectively. In this case, each stop hole 124 is formed in an elongated hole shape extending in the axial direction of the upper support leg 122.

As shown in FIGS. 3 and 4(A) and (B), the fall prevention stopper 130 drops the upper support leg 122 inserted into the lower support leg 112 and removes the upper support leg 122 from the lower support leg 112. A fixed mounting portion 131, a pressure fitting portion 134, and a receiving portion 136 are formed on a cylindrical body made of resin, respectively.

The fixed attachment portion 131 is a portion that is inserted into the lower end portion of the upper support leg 122 and fixedly attached thereto, and is formed into a substantially cylindrical shape that fits into the lower end portion of the upper support leg 122. The fixed attachment portion 131 has upper hook portions 131a formed at two positions facing each other in the circumferential direction. The upper hook portion 131a is a portion that is elastically hooked in the stop hole 124 formed in the upper support leg 122, and is configured by forming a claw at the tip of a plate-shaped body extending upward.

Further, the fixed attachment portion 131 is formed with relief portions 131b at two positions in a direction orthogonal to the radial direction between the two upper hook portions 131a facing each other. The escape portion 131b is a portion that avoids physical interference with the stopper engaging portion 123 protruding on the inner peripheral surface of the upper support leg 122, and is formed by cutting out in a concave shape. The reason why the stopper engaging portions 123 are formed at two positions facing each other is to improve the degree of freedom in the circumferential direction when the fall prevention stoppers 130 are attached to the left and right upper support legs 122, respectively. Is.

A fixed-side bridging portion 132 is formed inside the fixed mounting portion 131. The fixed-side erection section 132 is a component for reinforcing the fixed attachment section 131 and the intermediate erection section 133 to increase rigidity, and is formed of a wall body that stands up in a cross shape from the upper surface of the intermediate erection section 133. In this case, the four radial end portions of the fixed attachment portion 131 of the fixed-side erected portion 132 are connected to the inner peripheral surface of the fixed attachment portion 131, respectively.

The intermediate bridging portion 133 is a portion that improves the rigidity of the fixed attachment portion 131 and the pressure fitting portion 134 and supports the receiving portion 136, and is the inner peripheral portion of the boundary portion between the fixed attachment portion 131 and the pressure fitting portion 134. Is formed in a disk shape.

The press-fitting portion 134 is a portion that is inserted into the lower support leg 112 and slidably fits while pressing the inner peripheral surface of the lower support leg 112. It is configured by including six claw members 135 extending in a cantilever shape. In this case, the six claws 135 are evenly arranged along the inner peripheral surface of the upper end portion of the lower support leg 112.

The claw body 135 includes a plate-like arm portion 135a extending in a cantilever shape from the fixed attachment portion 131 side downward in the drawing, and a contact fitting portion 135b formed at a tip end portion of the arm portion 135a. Has been done. The contact fitting portion 135b has a hook-shaped overhanging portion 135c that extends radially outward from the tip of the arm portion 135a in a hook shape, and further extends radially outward from the hook-like overhanging portion 135c. After the protrusion, it is formed in a curved surface shape in which the amount of protrusion is gradually reduced. Thereby, the contact fitting portion 135b is formed in an intermittent ring shape along the inner peripheral surface of the lower support leg 112.

The hook-shaped overhanging portion 135c is a stepped portion with which the lower end of the intermediate cylinder 142 abuts, and is formed so as to project radially outward. Further, a portion of the contact fitting portion 135b below the hook-shaped overhanging portion 135c is a portion that elastically presses the inner peripheral surface of the lower support leg 112 and has an outer diameter slightly larger than the inner diameter of the inner peripheral surface. Is formed by.

The receiving portion 136 is a portion for preventing the press-fitting portion 134 from being damaged when the upper support leg 122 is displaced to the lower slide limit position and collides with the upper surface of the foot 111, and is press-fitted. It is formed so as to extend downward from the intermediate installation portion 133 inside the joining portion 134. More specifically, the receiving portion 136 has six plate-like bodies that extend in the axial direction of the fall prevention stopper 130 so as to project from the lower end portion of the pressing fitting portion 134 and that extend radially with respect to the coaxial line. It is composed of.

In this case, each receiving portion 136 is formed to have a diameter (radial length of the fall prevention stopper 130) that the elastically deformed claws 135 do not come into contact with in order to allow the elastic deformation of the claws 135 inward. ing. These receiving portions 136 are composed of two types of first receiving portions 136a and second receiving portions 136b.

As shown in FIG. 5, the first receiving portion 136a linearly extends along the axial direction of the foot 111 with respect to the upper surface of the foot 111 when the upper support leg 122 is displaced to the lower slide limit position. The amount of protrusion is formed along the axial direction of the foot 111 so as to abut (in other words, the front end surface is flat). On the other hand, the second receiving portion 136b can also be attached to another fixture in which the fall prevention stopper 130 according to the present embodiment is connected to the lower support leg 112 and the foot 111 in a connection form different from that of the present embodiment. It is formed so that it can.

Specifically, as shown in FIG. 6, the second receiving portion 136b is formed in a shape corresponding to the connection structure in which the lower support leg 112 is inserted into the inside of the foot 111 and is connected thereto. There is. In this case, the second receiving portion 136b has an inner peripheral surface such that the distal end surface thereof linearly abuts the inner peripheral surface of the cylindrical foot 111 when the upper support leg 122 is displaced to the lower sliding limit position. It is formed in a convex curved surface along the curved surface.

The height adjuster 140 is a component for fixing or releasing the position in the height direction of the upper support leg 122 inserted into the lower support leg 112, and mainly includes the stopper plate 141, the intermediate cylinder 142, and the inside. It is configured to include a cylindrical body 143 and an outer cylindrical body 150.

As shown in FIG. 7, the stopper plate 141 is a metal component for preventing vertical displacement of the upper support leg 122 inserted in the lower support leg 112, and is a rectangular steel plate. It is composed of a plate. In this case, the stopper plate 141 is curved and formed in an arc shape in the width direction so as to come into close contact with the inner cylinder body 143 and the outer cylinder body 150, which will be described later. The stopper plate 141 has an engagement protrusion 141 a formed on the inner side surface facing the inner cylinder 143.

The engagement protrusion 141a is a portion that fits into the stopper engagement portion 123 of the upper support leg 122, and is formed so as to project in a square shape from the plate-shaped portion that constitutes the stopper plate 141. The engagement protrusions 141a are formed on both ends of the stopper plate 141 in the longitudinal direction. In this case, the distance between the two engaging protrusions 141a corresponds to the distance between the stopper engaging portions 123.

As shown in FIGS. 8A and 8B, the intermediate cylinder 142 is a component into which the upper support leg 122 is inserted while being inserted into the upper end portion of the lower support leg 112. It is formed in a cylindrical shape. The intermediate cylinder 142 is provided with a stopper through hole 142a, a hook portion 142b, a lock projection engagement portion 142c, and a flange portion 142d. The stopper through hole 142a is a portion for penetrating the engagement projection 141a formed on the stopper plate 141, and is formed as a square hole on the front surface that penetrates inside the intermediate cylinder 142. That is, the stopper through hole 142a is formed at each of two positions overlapping the stopper through hole 114 when the intermediate cylinder 142 is attached to the lower support leg 112.

The hook portion 142b is a portion that is elastically hooked to the stop hole 116 formed in the lower support leg 112, and is formed by forming a claw at the tip of a plate-like body extending downward. The hooking portions 142b are formed on the outer peripheral surface of the lower end portion of the intermediate cylinder 142 at positions opposite to each other in the circumferential direction. The lock projection engagement portion 142c is a portion into which the lock projection 146 formed on the inner cylinder 143 is fitted, and is composed of two projections extending in parallel to each other in the axial direction of the intermediate cylinder 142. The lock projection engaging portions 142c are formed at positions corresponding to the notches 115 on the upper end portion of the outer peripheral surface of the intermediate cylinder 142. The flange portion 142d is a portion that is hooked on the upper end portion of the lower support leg 112 and hooked on the upper end portion of the inner cylinder body 143 to smooth the rotation of the inner cylinder body 143. It is formed to overhang.

The inner cylindrical body 143 is a component for pressing the stopper plate 141 outward in the radial direction of the lower support leg 112 and the upper support leg 122, respectively, as shown in FIGS. Yes, it is composed of a resin cylinder. In this case, the inner cylindrical body 143 is formed to have an inner diameter that can slide on the outer peripheral surface of the lower support leg 112. An inner pressing portion 144, a clearance hole 145, a lock protrusion 146, an outer cylinder abutting portion 147, and a hooking portion 148 are formed on the inner cylindrical body 143, respectively.

The inner pressing portion 144 is a portion that presses the stopper plate 141 radially outward of the lower support leg 112 and the upper support leg 122, and the amount of protrusion of the outer peripheral surface is continuous along the circumferential direction of the inner cylindrical body 143. It is composed of an increasing slope. More specifically, the inner pressing portion 144 is formed with a minimum portion 144a, a maximum portion 144b and a maximum front portion 144c.

The minimum portion 144a is formed with the minimum amount of protrusion that allows the engagement protrusion 141a to be fitted into the stopper engagement portion 123 of the upper support leg 122 in a state where the inner surface of the stopper plate 141 is in close contact with the minimum portion 144a. It is a part. The minimum portion 144a is formed of an inclined surface having a slope in which the protrusion amount without protrusion is "0" and the protrusion amount gradually increases from the maximum front portion 144c.

The maximum portion 144b is a portion formed by the maximum amount of protrusion in which the engagement protrusion 141a is completely disengaged from the stopper engagement portion 123 in a state where the inner surface of the stopper plate 141 is in close contact with the maximum portion 144b. The maximum portion 144b is formed to have a constant overhang and a length substantially equal to the width direction and the length of the stopper plate 141.

The maximum front portion 144c is a portion in which the minimum amount 144a in which the amount of protrusion gradually increases toward the maximum portion 144b is a portion immediately before the maximum portion 144b, and the increase rate of the amount of protrusion further increases. That is, the maximum front part 144c is a part formed immediately before the maximum part 144b and having a steeper slope than the minimum part 144a. The maximum front part 144c is formed to have a length substantially equal to the width direction of the stopper plate 141 and a half length.

The inner pressing portion 144 is formed in parallel with each other at three positions of the end portion side portion and the central portion of the inner cylindrical body 143 in the axial direction. That is, the inner pressing portion 144 is formed so as to be located on each outer side of the two engaging projections 141a and between the two engaging projections 141a with respect to the two engaging projections 141a of the stopper plate 141. There is.

The escape hole 145 is a portion for avoiding physical interference with the engagement protrusion 141a of the inner cylindrical body 143 that rotates relatively to the stopper plate 141, and the through hole through which the engagement protrusion 141a penetrates is inside. It is formed in a long hole shape along the pressing portion 144. The escape holes 145 are respectively formed at two positions facing the two engaging protrusions 141a of the stopper plate 141 when attached to the lower support leg 112.

The lock protrusion 146 is a portion for elastically fitting the lock protrusion engagement portion 142c of the intermediate cylinder 142 to prevent the inner cylinder body 143 from rotating, and is provided at the tip of the plate-like body extending upward. It is configured to include a protrusion protruding inward in the radial direction. The outer cylinder abutment portion 147 is a portion to which a rotational force in the circumferential direction is applied from the outer cylinder body 150, and is formed so as to project in a convex shape from the outer peripheral surface of the inner cylinder body 143. In the present embodiment, the outer cylinder abutting portion 147 is formed at a position separated from each minimum portion 144a in the three inner pressing portions 144 formed to extend in a strip shape and at the end face of each maximum portion 144b. ing.

The hooking portion 148 is a portion that is elastically hooked to the stop hole 153 formed in the outer tubular body 150, and is configured by forming a claw at the tip of a plate-shaped body that projects radially outward and hangs down. .. The hook portions 148 are respectively formed at positions on the outer peripheral surface of the lower end portion of the inner cylindrical body 143, which are opposite to each other in the circumferential direction.

As shown in FIGS. 11A, 11B, and 12, the outer tubular body 150 rotates the inner tubular body 143 in the circumferential direction and causes the stopper plate 141 to move to the lower support leg 112 and the upper support leg 122. Is a component for pressing inward in each radial direction, and is composed of a resin cylindrical body. In this case, the outer cylindrical body 150 is formed with an inner diameter that fits on the outer peripheral surface of the inner cylindrical body 143 with the stopper plate 141 sandwiched therebetween. The outer cylinder body 150 is provided with an outer pressing portion 151, an inner cylinder pressing portion 152, and a stop hole 153, and a lock piece 154.

The outer pressing portion 151 is a portion that sandwiches the stopper plate 141 with the inner pressing portion 144 and presses the lower support leg 112 and the upper support leg 122 inward in the respective radial directions. It is composed of an inclined surface whose inner diameter is continuously reduced. More specifically, the outer pressing portion 151 is formed with a minimum portion 151a, a maximum portion 151b, and an elastic pressing portion 151c.

The minimum portion 151a is a portion formed to have the smallest inner diameter such that the engagement protrusion 141a can be fitted into the stopper engagement portion 123 of the upper support leg 122 in a state where the outer surface of the stopper plate 141 is in close contact with the minimum portion 144a. And is formed at a position facing the minimum portion 144a of the inner pressing portion 144. The minimum portion 151a is formed of an inclined surface having a slope whose inner diameter gradually increases toward the elastic pressing portion 151c.

The maximum portion 151b is formed to have an inner diameter that allows the stopper plate 141 to be displaced radially outward by the maximum portion 144b of the inner pressing portion 144 to a position where the engaging protrusion 141a of the stopper plate 141 is completely disengaged from the stopper engaging portion 123. And is formed at a position facing the maximum portion 144b. The maximum portion 151b is formed to be longer than the width and length of the stopper plate 141.

The elastic pressing portion 151c is a portion that elastically presses the outer surface of the stopper plate 141 located at the maximum front portion 144c of the inner pressing portion 144, and has two cantilevered plate-like pieces that face each other in the circumferential direction. It is composed of. Specifically, in the elastic pressing portion 151c, the tip end portion of the minimum portion 151a on the maximum portion 151b side and the tip end portion of the maximum portion 151b on the minimum portion 151a side are cut out into a cantilever plate-shaped piece, respectively. It is formed so as to project inward.

The elastic pressing portions 151c are respectively formed at positions facing the two escape holes 145 formed in the inner cylindrical body 143. It should be noted that the elastic pressing portion 151c is not limited to the present embodiment in the number and position of the elastic pressing portions 151c as long as they can elastically press the stopper plate 141 inward in the radial direction.

The inner cylinder pressing portion 152 is a portion for pressing the inner cylinder 143 in one of the circumferential directions or the other direction to rotate the inner cylinder 143, and is provided on the inner peripheral surface of the outer cylinder 150. The inner diameter of the portion other than the outer pressing portion 151 in the circumferential direction is formed to be equal to or smaller than the outer pressing portion 151. More specifically, in the inner cylinder pressing portion 152, the rear end portions of the minimum portion 151a and the maximum portion 151b of the outer pressing portion 151 respectively project radially inward to contact the outer cylinder contact portion 147 of the inner cylindrical body 143. Is formed.

The stop hole 153 is a through hole for integrally connecting the outer cylinder body 150 and the inner cylinder body 143 by fitting the hooking portion 148 of the inner cylinder body 143. The stop holes 153 are formed at positions opposite to each other in the circumferential direction of the outer tubular body 150.

The lock piece 154 presses the lock protrusion 146 of the inner cylindrical body 143 inward in the radial direction to fit the lock protrusion engaging portion 142c of the intermediate cylinder 142 to rotate the inner cylindrical body 143 and the outer cylindrical body 150. It is a regulated part. More specifically, the lock piece 154 has a lock protrusion 146 of the inner cylindrical body 143 radially inwardly on a part of the inner side surface of a plate-like body that is slidably fitted to the upper end of the outer cylindrical body 150. The lock protrusion pressing portion 154a is configured to be pressed to the. The lower support leg 112, the upper support leg 122, and the height adjuster 140 form a height adjusting mechanism.

(Assembling the desk 100)
Here, an assembling operation of the desk 100 configured as above will be described. First, the operator prepares one base leg 110, one top plate 120, two drop prevention stoppers 130, and two height adjusters 140, respectively. In this case, the operator forms the lower support leg 112 by forming the stopper through hole 114, the notch 115 and the stop hole 116 on the steel pipe material by using press working such as press cutting and piercing removal. After that, the foot 111 and the connecting rod 113 manufactured in a separate process are connected to the lower support leg 112 by welding to obtain the base leg 110.

Further, the operator forms the upper support leg 122 by forming the stopper engaging portion 123 and the stop hole 124 on the steel pipe material by press working, and then forms the upper support leg 122 by sheet metal working. The bottom plate 121 and the U-shaped member 125 are attached to the back surface of the wooden top plate 120 to obtain the top plate 120. Further, the operator molds the fall prevention stopper 130, the intermediate cylinder 142, the inner cylinder 143, and the outer cylinder 150 by injection molding. In this case, the fall prevention stopper 130, the intermediate cylinder 142, the inner cylinder 143, and the outer cylinder 150 are formed in symmetrical shapes corresponding to the left and right lower support legs 112 and the upper support legs 122, respectively. Further, the operator obtains the stopper plate 141 by forming the engaging protrusion 141a by performing the forging process on the steel plate. In the present embodiment, the left and right lower support legs 112 and the upper support legs 122 of the desk 100 are symmetrical in height adjustment tool 140, but the left and right sides may have the same shape. Is.

Next, the worker assembles the base leg 110, the top plate 120, and the height adjusting tool 140 with each other. Specifically, the worker inserts the intermediate cylinders 142 from the upper ends of the left and right lower support legs 112 placed on the floor surface, which is the installation surface of the desk 100, and inserts the intermediate cylinders 142 into the lower support legs. After mounting inside 112, the inner cylindrical body 143 is passed through the outside of each of these lower support legs 112. In this case, the operator arranges the maximum portion 144b of the inner pressing portion 144 of each inner cylindrical body 143 so as to be axially adjacent to the stopper through hole 114 of the lower support leg 112. As a result, each lock protrusion 146 of each inner cylinder body 143 elastically fits into one of the three lock protrusion engagement portions 142c of the intermediate cylinder 142, so that the inner cylinder body 143 is circumferentially and vertically oriented. The displacement is lightly regulated.

Next, the operator covers the inner cylindrical bodies 143 with the left and right outer cylindrical bodies 150 while the stopper plates 141 are respectively applied to the inner pressing portions 144 of the left and right inner cylindrical bodies 143. In this case, the worker removes the lock piece 154 from each outer cylinder body 150. Further, as shown in FIG. 13, the worker covers the inner tubular body 143 with the outer tubular body 150 such that the maximum portion 151b of the outer pressing portion 151 of each outer tubular body 150 faces the stopper plate 141. As a result, the stopper plate 141 is in a state in which the engagement protrusion 141 a is not fitted to the stopper engagement portion 123 of the upper support leg 122.

Next, the worker attaches the fall prevention stoppers 130 to the lower end portions of the left and right upper support legs 122, respectively. Specifically, as shown in FIG. 14, the worker inserts the fixed attachment portion 131 of the fall prevention stopper 130 into the lower end portion of the upper support leg 122 and fits the upper hook portion 131 a into the stop hole 124. As a result, the fixed attachment portion 131 of the fall prevention stopper 130 is fitted to the lower end portion of the upper support leg 122 and the pressing fitting portion 134 is exposed.

Next, as shown in FIG. 15, the worker inserts the left and right upper support legs 122 to which the fall prevention stoppers 130 are attached respectively into the lower support legs 112. In this case, as shown in FIGS. 16 and 17, the fall prevention stopper 130 moves inside the intermediate cylinder 142 in a state where the six claws 135 are elastically tilted inward by being inserted into the intermediate cylinder 142. After advancing, the contact fitting portion 135b passes through the lower end portion of the intermediate cylinder 142 to open outward in the radial direction of the intermediate cylinder 142 and come into contact with the inner peripheral surface of the lower support leg 112. In this case, since the contact fitting portion 135b is formed with an outer diameter larger than the inner diameter of the lower support leg 112, it elastically presses the inner peripheral surface of the lower support leg 112. As a result, the desk 100 is assembled in a free state in which the top plate 120 is vertically movable.

Next, the operator lowers the top plate 120 to the lower limit position in the vertical stroke. In this case, the operator inserts the upper support leg 122 into the lower support leg 112 while resisting the sliding resistance between the contact fitting portion 135b of the fall prevention stopper 130 and the inner peripheral surface of the lower support leg 112. Go out. Then, the operator can understand that the first support portion 136a of the reception portion 136 of the fall prevention stopper 130 hits the upper surface of the foot 111 and the upper support leg 122 is displaced to the lower slide limit position. it can. In this case, the fall prevention stopper 130 can prevent the pressing fitting portion 134 from hitting the upper surface of the foot 111 and being damaged by the receiving portion 136 hitting the upper surface of the foot 111, and at the same time, the fixed side. The erection portion 132 prevents the intermediate erection portion 133 from being pressed by the receiving portion 136 and being damaged (see FIG. 5 ).

Next, as shown in FIG. 18, the worker manually rotates each of the left and right outer cylindrical bodies 150 (in the direction of arrow A in FIG. 13) to attach the elastic pressing portion 151c of the outer pressing portion 151 to the stopper plate 141. Position each to face. In this case, the inner cylinder body 143 rotates integrally with the outer cylinder body 150 by the inner cylinder pushing portion 152 of the outer cylinder body 150 pushing the outer cylinder contact portion 147 of the inner cylinder body 143. Further, the stopper plate 141 is displaced inward in the radial direction because the inner diameter of the outer pressing portion 151 and the protruding amount of the inner pressing portion 144 are reduced as the outer cylindrical body 150 and the inner cylindrical body 143 rotate. Further, when the operator rotates the outer tubular body 150, the stopper plate 141 passes through the maximum front portion 144c of the inner pressing portion 144, so that the operation feeling suddenly becomes lighter, so that the stopper plate 141 becomes the elastic pressing portion 151c. You can recognize that you are located.

Further, in this case, in the height adjuster 140, the lock protrusion 146 is elastically disengaged from the lock protrusion engagement portion 142c corresponding to the supported state by the inner cylinder 143 being rotated by the rotation of the outer cylinder 150. At the same time, since it elastically fits into the lock projection engaging portion 142c corresponding to the temporarily fixed state, a clicking sound is generated each time and the operator is given a feeling of resilience. Thereby, the operator can easily recognize that the outer cylindrical body 150 has rotated to the position of the temporarily fixed state. As a result, the left and right stopper plates 141 are elastically pressed inward in the radial direction by the elastic pressing portions 151c, and the tip end portions of the engagement protrusions 141a are elastically exposed inside the intermediate cylinder 142 to be in a temporarily fixed state. ..

Next, the operator lifts the top plate 120 to lightly fit the engagement protrusions 141a to the left and right stopper engagement portions 123. In this case, since the engaging protrusion 141a is elastically pressed by the elastic pressing portion 151c, even if the stopper engaging portion 123 is displaced upward by the upward movement of the upper support leg 122, the outer side in the radial direction. Then, it is displaced inward in the radial direction and follows the unevenness of the outer peripheral surface of the upper support leg 122 including the stopper engaging portion 123. On the other hand, since the engagement protrusion 141a is hooked on the horizontal surface of the upper end of the stopper engagement portion 123, it is not displaced radially outward by a downward force. That is, since the engaging protrusions 141a are elastically fitted to the stopper engaging portions 123 having an inverted triangular shape, the top plate 120 can be immediately dropped by releasing the hand even when the upper plate 120 can be raised. There is no.

Then, as shown in FIG. 19, the worker further rotationally operates (in the direction of arrow B in FIG. 18) each outer cylinder body 150 at a position where the engagement protrusion 141a is lightly fitted to the stopper engagement portion 123. The minimum portion 151a of the outer pressing portion 151 is positioned at a position facing the stopper plate 141, respectively. In this case, the stopper plate 141 is further displaced radially inward because the inner diameter of the outer pressing portion 151 and the protruding amount of the inner pressing portion 144 are further reduced by the rotation of the outer cylindrical body 150 and the inner cylindrical body 143. To do. As a result, the left and right stopper plates 141 are forcibly pressed inward in the radial direction by the minimum portion 151a, and the engagement protrusions 141a are completely fitted into the stopper engagement portions 123.

Also in this case, in the height adjusting tool 140, the lock protrusion 146 is elastically moved from the lock protrusion engaging portion 142c corresponding to the temporarily fixed state when the inner cylinder 143 is rotated by the rotation of the outer cylinder 150. And then elastically fits into the lock projection engaging portion 142c corresponding to the supported state, so that a clicking sound is generated each time and the operator is given a positive response. Thereby, the operator can easily recognize that the outer cylindrical body 150 has rotated to the position in the supported state. As a result, the upper support leg 122 is in a supporting state in which the height of the top plate 120 is fixed because the displacement in the vertical direction is restricted by the fitting of the engagement protrusion 141a.

Then, the worker inserts the two lock pieces 154 into each outer cylinder body 150. As a result, in the height adjuster 140, the lock projection pressing portion 154a strongly presses the lock projection 146 of the inner cylinder 143 inward in the radial direction to fit the lock projection engaging portion 142c of the intermediate cylinder 142. The rotation of the tubular body 150 and the inner tubular body 143 in the circumferential direction is restricted. Thereby, the operator can assemble the desk 100.

(Operation of fall prevention stopper 130)
Next, the operation of the fall prevention stopper 130 configured as described above will be described with reference to height adjustment work for changing the height of the desk 100. In this height adjustment work, the work of adjusting the height of the top plate 120 from the supporting state (see FIG. 19) in which the height of the top plate 120 is fixed in the above-described assembly work will be described.

An operator who adjusts the height of the top plate 120 first slides the lock pieces 154 of the left and right outer cylindrical bodies 150 upward to release the pressing state of the lock protrusion 146 by the lock protrusion pressing portion 154a. As a result, the height adjuster 140 becomes rotatable while the lock projection 146 is elastically fitted to the lock projection engagement portion 142c of the intermediate cylinder 142.

Next, when the operator wants to raise the height of the top plate 120, as shown in FIG. 18, the left and right outer tubular bodies 150 are rotated (in the direction of arrow C in FIG. 19) to push the outer side. The elastic pressing portion 151c of the portion 151 is positioned at a position facing the stopper plate 141, respectively. In this case, since the outer cylinder body 150 and the inner cylinder body 143 rotate, the stopper plate 141 is displaced radially outward by increasing the inner diameter of the outer pressing portion 151 and the protruding amount of the inner pressing portion 144, respectively. Further, the operator can recognize that the stopper plate 141 is positioned on the elastic pressing portion 151c by the stopper plate 141 hitting the maximum front portion 144c of the inner pressing portion 144 when the outer cylinder body 150 is rotated.

Further, in the height adjuster 140, the lock protrusion 146 is elastically disengaged from the lock protrusion engagement portion 142c corresponding to the supporting state by the rotation of the inner cylinder 143 by the rotation of the outer cylinder 150. Since the lock projection engaging portion 142c corresponding to the temporarily fixed state is elastically fitted, a clicking sound is generated each time, and the operator feels a touch. From these, the operator can easily recognize that the outer tubular body 150 has rotated to the position in the temporarily fixed state. That is, the height adjuster 140 is in a temporarily fixed state in which the engaging protrusions 141a are elastically and lightly fitted to the left and right stopper engaging portions 123.

Therefore, the operator freely selects the height position of the top plate 120 in the ascending direction by changing the position of the stopper engaging portion 123 into which the left and right engaging protrusions 141a fit by raising the top plate 120. be able to. In this case, the operator lifts the upper support leg 122 in the lower support leg 112 while resisting the sliding resistance between the contact fitting portion 135b of the fall prevention stopper 130 and the inner peripheral surface of the lower support leg 112. Let That is, the top plate 120 corresponds to the supported body in the present invention. In the temporarily fixed state, as described above, the top plate 120 is in a state in which it can be lifted because the engaging protrusions 141a are elastically fitted to the stopper engaging portions 123 having an inverted triangular shape. Even if you let go, it will not fall immediately.

In addition, when the operator displaces the top plate 120 to the upper slide limit position in the vertical stroke in this temporarily fixed state, the hook-shaped overhanging portion 135c of the fall prevention stopper 130 causes the intermediate cylinder 142 to move. It gets caught in the bottom edge. Thus, the fall prevention stopper 130 can prevent the upper support leg 122 from coming off the lower support leg 112 when the top plate 120 is raised (see FIG. 17).

Then, as shown in FIG. 19, when the operator specifies the fitting position of the engagement protrusion 141a with the desired height position of the top plate 120 to the stopper engagement portion 123, The left and right outer tubular bodies 150 are rotated in the opposite direction to the previous direction (direction of arrow B in FIG. 18) to position the minimum portion 151a of the outer pressing portion 151 at a position facing the stopper plate 141, respectively. Even in this case, the stopper plate 141 is moved radially inward by rotating the outer cylinder body 150 and the inner cylinder body 143 to decrease the inner diameter of the outer pressing portion 151 and the protruding amount of the inner pressing portion 144, respectively. Be guided. As a result, the left and right stopper plates 141 are forcibly pressed inward in the radial direction by the minimum portion 151a, and the engagement protrusions 141a are completely fitted into the stopper engagement portions 123.

Also in this case, in the height adjusting tool 140, the lock protrusion 146 is elastically moved from the lock protrusion engaging portion 142c corresponding to the temporarily fixed state when the inner cylinder 143 is rotated by the rotation of the outer cylinder 150. And then elastically fits into the lock projection engaging portion 142c corresponding to the supported state, so that a clicking sound is generated each time and the operator is given a positive response. Thereby, the operator can easily recognize that the outer cylindrical body 150 has rotated to the position in the supported state. As a result, the upper support leg 122 is in a supporting state in which the height of the top plate 120 is fixed because the displacement in the vertical direction is restricted by the fitting of the engagement protrusion 141a.

Then, the worker inserts the left and right lock pieces 154 deeply into the outer cylindrical bodies 150 again. As a result, in the height adjuster 140, the lock projection pressing portion 154a strongly presses the lock projection 146 of the inner cylinder 143 inward in the radial direction to fit the lock projection engaging portion 142c of the intermediate cylinder 142. The rotation of the tubular body 150 and the inner tubular body 143 in the circumferential direction is restricted. In this state, the desk 100 is used as a desk.

On the other hand, when the operator wants to lower the height of the top plate 120, the worker once positions the height of the top plate 120 at a height equal to or lower than the current height. Specifically, as shown in FIG. 13, the worker further rotates the outer cylindrical body 150 from the position of the temporarily fixed state (in the direction of arrow D in FIG. 18) to cause the maximum portion 151b of the outer pressing portion 151 to move. Is positioned at a position facing the stopper plate 141, that is, at a position where the maximum portion 144b of the inner pressing portion 144 faces the stopper plate 141. In this case, the stopper plate 141 is guided radially outward because the inner diameter of the outer pressing portion 151 and the protruding amount of the inner pressing portion 144 increase as the outer cylindrical body 150 and the inner cylindrical body 143 rotate. ..

In this case, in the height adjuster 140, the lock protrusion 146 is elastically disengaged from the lock protrusion engagement portion 142c corresponding to the temporarily fixed state when the inner cylinder 143 is rotated by the rotation of the outer cylinder 150. After that, since the lock projection engaging portion 142c corresponding to the free state is elastically fitted, a clicking sound is generated each time and the operator is given a feeling of resilience. From these, the operator can easily recognize that the outer cylindrical body 150 has rotated to the position in the free state. That is, the height adjusting tool 140 is in a free state in which the engaging protrusions 141a are completely separated from the left and right stopper engaging portions 123.

In this case, the upper support leg 122 presses the inner peripheral surface of the lower support leg 112 by the six contact fitting portions 135 b of the fall prevention stopper 130, and therefore the weight of the upper support leg 122 itself and the top plate 120. The weight does not cause the lower support leg 112 to fall downward. Therefore, the worker lowers the upper support leg 122 into the lower support leg 112 while resisting the sliding resistance between the contact fitting portion 135b of the drop prevention stopper 130 and the inner peripheral surface of the lower support leg 112. After lowering the top plate 120 to a height equal to or lower than the current height (for example, the lower limit position), the left and right outer tubular bodies 150 are again rotated in the opposite direction (direction of arrow A in FIG. 13) to push the outer pressing portion. The elastic pressing portions 151c of the 151 are respectively positioned at positions facing the stopper plate 141 to be in a temporarily fixed state.

As a result, in the same manner as described above, the worker raises the top plate 120 to change the position of the stopper engaging portion 123 into which the left and right engaging protrusions 141a are fitted, thereby changing the height position of the top plate 120. You can choose freely in the ascending direction. Then, when the operator specifies the fitting position of the engaging projection 141a with the desired height position of the top plate 120 to the stopper engaging portion 123, as described above, the left and right The top plate 120 is supported again by rotating the outer cylinder body 150 in the opposite direction (in the direction of arrow D in FIG. 18) to position the minimum portion 151a of the outer pressing portion 151 at a position facing the stopper plate 141. (See FIG. 19).

As can be understood from the above description of the operation, according to the above-described embodiment, the fall prevention stopper 130 is provided in the inside of the upper support leg 122 and the lower support leg 112 which are fitted to each other. The pressing fitting portion 134 is fitted in the end portion of the lower support leg 112 which is attached to the end portion via the fixed attachment portion 131 and is located outside the upper support leg 122 and the lower support leg 112. The inside of the lower support leg 112 is pressed. As a result, the fall prevention stopper 130 according to the present invention makes the upper support leg 122 slidable with respect to the lower support leg 112 when adjusting the height of the top plate 120 as the supported body. Also in the above, the inner peripheral surface of the lower support leg 112 fitted with the pressing fitting portion 134 is pressed to increase the sliding resistance, so that the upper support leg 122 can be prevented from falling and the height of the leg body can be adjusted. It can be done easily.

Furthermore, in carrying out the present invention, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the object of the present invention.

For example, in the above embodiment, the fall prevention stopper 130 is configured by providing the fixed attachment portion 131 with the two upper hook portions 131a. However, the fixed attachment portion 131 can also be configured to have one or three or more upper hook portions 131a. Further, the fixed attachment portion 131 may be configured by omitting the upper hook portion 131a. In this case, the fixed attachment portion 131 can be formed in a cylindrical shape that is press-fitted into the upper support leg 122.

Further, in the above-described embodiment, the fall prevention stopper 130 is configured by providing the fixed-side bridging portion 132 inside the fixed mounting portion 131. However, the fall prevention stopper 130 may be configured by omitting the fixed-side bridging portion 132 inside the fixed mounting portion 131.

In addition, in the above-described embodiment, the fall prevention stopper 130 has the press-fitting portion 134 formed of six claws 135. However, the press-fitting portion 134 may be constituted by one claw body 135 in which the cross-sectional shape of the claw body 135 is formed in one cylindrical shape, or two to five or seven or more claw bodies 135. It can also be configured with. Further, the pressing fitting portion 134 may be formed in a simple cylindrical shape that slides on the lower support leg 112 in an elastically deformed state. Therefore, in this case, since the press-fitting portion 134 is formed in a cylindrical shape with the hook-shaped overhanging portion 135c omitted, the upper support leg 122 can be easily pulled out from the lower support leg 112.

Further, in the above embodiment, the fall prevention stopper 130 is configured by providing the receiving portion 136 inside the pressing fitting portion 134. However, the fall prevention stopper 130 may be configured by omitting the receiving portion 136 inside the pressing fitting portion 134. The receiving portion 136 is composed of a first receiving portion 136a and a second receiving portion 136b. However, the receiving portion 136 may be configured by the first receiving portion 136a or the second receiving portion 136b. Further, the receiving portion 136 can be formed in a columnar shape such as a columnar shape or a prismatic shape, or a cylindrical shape such as a cylindrical shape or a rectangular tube shape, in addition to the plate shape.

Further, in the above embodiment, the fall prevention stopper 130 is configured to include the disk-shaped intermediate erection portion 133. However, the fall prevention stopper 130 may be configured by omitting the disc-shaped intermediate erection portion 133. Further, the intermediate bridging portion 133 may be formed in a beam shape such as a rod shape or a plate shape extending in the radial direction of the fall prevention stopper 130, in addition to the disk shape.

Further, in the above embodiment, the fall prevention stopper 130 is formed in a cylindrical shape corresponding to the cylindrical pipe shape of the lower support leg 112 and the upper support leg 122. However, the fall prevention stopper 130 is formed in a shape corresponding to the cross-sectional shape of the lower support leg 112 and the upper support leg 122. Therefore, the fall prevention stopper 130 can be formed in a rectangular cylindrical shape when the lower support leg 112 and the upper support leg 122 are formed in a rectangular pipe shape.

Further, in the above-described embodiment, the fall prevention stopper 130 is configured to be fixedly attached to the upper support leg 122 and fitted to the lower support leg 112 with the sliding material. However, the fall prevention stopper 130 is fitted and attached in the end portion of the support leg located inside of the upper support leg 122 and the lower support leg 112 that are fitted to each other, and inside the support leg located outside. It may be slidably fitted in a state in which the inner peripheral surface of the support leg is pressed while being inserted into the. Therefore, when the lower support leg 112 is fitted in the upper support leg 122, the fall prevention stopper 130 fixedly attaches the fixed mounting portion 131 to the lower support leg 112 and presses it into the upper support leg 122. The fitting portion 134 can be configured to fit the sliding member.

Further, in the above embodiment, the fall prevention stopper 130 is applied to the desk 100 including the height adjusting tool 140. However, the fall prevention stopper 130 can be widely applied to a leg body in which the lower support leg 112 and the upper support leg 122 are slidably fitted to each other and the length in the height direction can be adjusted to extend and contract. it can. That is, the fall prevention stopper 130 is composed of the lower support leg 112 and the upper support leg 122 whose length in the height direction is adjustable by a height adjuster having a different configuration from the height adjuster 140. Can be applied to the legs.

Further, in the above embodiment, the desk 100 is a learning desk used in an educational facility such as an elementary school or a junior high school, but a desk other than the learning desk, for example, a teaching table, a home study desk, an office desk or a dining table. Can also be implemented.

Further, in the above embodiment, the fall prevention stopper 130 is applied to the desk 100. That is, the top plate 120 corresponds to the supported object in the present invention, and the desk 100 corresponds to the furniture in the present invention. However, the fall prevention stopper 130 can be widely applied to furniture other than the desk 100, such as furniture and tools. Here, examples of the furniture include a chair, a whiteboard, a tripod (a table having three legs), or a microphone stand. In this case, when the furniture is a chair, the supported object is the seat plate that constitutes the seating surface of the chair, when the furniture is a white board, the supported object is the white plate, and when the furniture is a tripod The supported body is a stand supported by three legs, and when the furniture is a microphone stand, the supported body is a holder that detachably holds the microphone. That is, the fall prevention stopper 130 can be widely applied to a fixture in which two pipe members are vertically slidably fitted to each other and can be fixed at an arbitrary height position. In this case, the two pairs of pipe members, that is, the lower support leg 112 and the upper support leg 122 may be two sets as in the above embodiment, but may be one set like a microphone stand.

100... desk,
110... Base leg, 111... Foot, 112... Lower support leg, 113... Connecting rod, 114... Stopper through hole, 115... Notch portion, 116... Stop hole,
120... Top plate, 121... Bottom plate, 122... Upper support leg, 123... Stopper engaging portion, 124... Stop hole, 125... U-shaped member,
130... Fall prevention stopper, 131... Fixed attachment part, 131a... Upper hook part, 131b... Escape part, 132... Fixed side installation part, 133... Intermediate installation part, 134... Press fitting part, 135... Claw body, 135a ... arm portion, 135b... contact fitting portion, 135c... hook-shaped overhanging portion, 136... receiving portion, 136a... first receiving portion, 136b... second receiving portion,
140... Height adjusting tool, 141... Stopper plate, 141a... Engagement projection, 142... Intermediate tube, 142a... Stopper through hole, 142b... Hooking section, 142c... Lock projection engagement section, 142d... Flange section, 143... Inner cylinder 144, inner pressing portion, 144a... minimum portion, 144b... maximum portion, 144c... maximum front portion, 145... escape hole, 146... lock protrusion, 147... outer cylinder contact portion, 148... hook portion,
150... Outer cylinder, 151... Outer pressing part, 151a... Minimum part, 151b... Maximum part, 151c... Elastic pressing part, 152... Inner cylinder pressing part, 153... Stop hole, 154... Lock piece, 154a... Lock protrusion pressing Department.

Claims (9)

In the expandable leg body, the pipe-shaped upper support leg is slidably fitted to the pipe-shaped lower support leg rising from the installation surface to support the supported body on the upper support leg. A drop prevention stopper that prevents the upper support leg from falling,
A fixed mounting portion that is fitted and mounted in an end portion of the supporting leg located inside the upper supporting leg and the lower supporting leg that are fitted to each other;
Of the upper support leg and the lower support leg that are formed to extend on the side opposite to the tip end of the fixed attachment portion and are fitted to each other, the fixed support portion is inserted into a support leg located outside and is supported. A fall prevention stopper, comprising: a press fitting portion that slidably fits in a state where an inner peripheral surface of the inside is pressed. The fall prevention stopper according to claim 1,
The fixed mounting portion is
It is formed into a cylindrical shape that fits inside the supporting leg located inside the cylindrical shape,
The press fitting portion,
At least two claw bodies that are arranged along the circumferential direction of the inner peripheral surface of the support leg that is formed in a cylindrical shape and that is located outside and that extend in a cantilever shape from the fixed attachment portion side are provided. Fall prevention stopper to be used. The fall prevention stopper according to claim 2,
The nail body is
An arm portion extending in a plate shape from the fixed mounting portion side,
The tip end portion of the arm portion has a contact fitting portion that projects outward in the radial direction of the pressing fitting portion,
The contact fitting portion,
The arm portion has a hook-shaped protruding portion that protrudes outward in the radial direction from the tip end portion of the arm portion, and has a curved surface that gradually reduces the protrusion amount with respect to the hook-shaped protruding portion. Fall prevention stopper that is characterized by The fall prevention stopper according to claim 2 or 3, further comprising:
A fall prevention stopper comprising an intermediate erection portion erected in a radial direction on an inner peripheral portion between the fixed attachment portion and the pressing fitting portion. The fall prevention stopper according to claim 4, further comprising:
A fall prevention stopper, comprising: a fixed-side erection portion that is erected between the inner peripheral portions of the fixed attachment portion while being connected to the intermediate erection portion. The fall prevention stopper according to claim 4 or 5, further comprising:
A fall prevention stopper, comprising: a receiving portion that is provided inside the press-fitting portion, extends downward from the intermediate bridging portion, and is formed so as to project from a lower end portion of the press-fitting portion. A pipe-shaped lower support leg that stands up from the installation surface,
A pipe-shaped upper support leg that hangs down from a supported object supported above the lower support leg and slidably fits outside or inside the lower support leg,
A fixture comprising a height adjuster for adjusting the height of the supported body by adjusting the amount of insertion of the lower support leg and the upper support leg,
A fixture comprising the fall prevention stopper according to any one of claims 1 to 6. The furniture according to claim 7,
The furniture, wherein the supported object is a top plate of a desk. The furniture according to claim 7,
The furniture, wherein the supported body is a seat plate that constitutes a seat surface of a chair.

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