KR20200120268A - Height adjustment table - Google Patents

Abstract

The present invention relates to a height-adjustable table with an upper plate of the table elevated/lowered up and down. More specifically, according to the present invention, a fixing support unit is engaged with a front end of an elevation pillar, and an upper side of the fixing support unit is engaged with a pressurizing fixing unit and a fixing operation unit engaged with a front end of a cylinder shaft of a gas cylinder. On an end on the other side of a cable engaged with the fixing operation unit in a transversal direction, an operation lever body is fixed and formed to pull the cable in a transversal direction. The operation cable placed in a straight shape does not loosen or bend such that the operation responsiveness of the gas cylinder is greatly improved. In addition, the flow distance of the cable becomes shorter such that the design of a minimum volume of the operation means of the gas cylinder including the operation lever is possible. A cable accommodation means including the cable and an operation means are configured by coming in almost full contact with a lower surface of the upper plate. Accordingly, the exterior is simple. There is no unnecessary waste of space on a lower side of the upper plate. Therefore, it is more efficient, and at the same time the interference or contact with the leg of the user can be minimized.

Description

Height adjustment table with improved operation structure

The present invention relates to a height adjustment table in which the upper plate of the table is raised and lowered, and more particularly, through structural improvement of the control operation part of the gas cylinder for raising and lowering the upper plate, a quicker and more accurate response is obtained. Of course, it relates to a height-adjusting table having a simple and neat finish for the bottom of the top and expandability for the available space.

In general, a table used for lectures, a small desk, or various auxiliary tables are composed of an upper plate, a post, and a lower support. The upper plate is made of a square or circular shape in a plane, and the post is circular or polygonal. It is made of, and the lower support has a width and shape enough to allow the table to stand firmly, and the casters mounted on the bottom of the lower support allow the table to be easily moved.

Tables of various purposes and shapes are usually made based on the height of a general adult, so the height of the top plate may not be appropriate depending on the user, and the height of the top plate is not appropriate depending on the purpose of use of the table. Often, it causes discomfort.

Accordingly, in recent years, the upper plate in the table can be lifted up and down through various elevating means, so that the table can be adjusted to the best height according to the purpose of the table or the needs of the user. A height adjustable table is being used.

In other words, as in Korean Patent No. 10-1200827, in the floor provided to be spaced apart from the ground, a through hole provided in the center of the floor, and an elevation table device provided to be able to move up and down in the through hole, the floor A fixed body in the shape of a square cylinder having a rack pin hole in which rack pins are inserted at the top and bottom of both sides integrated with the floor fixing plate so that it can be mounted in the through hole of the floor fixing plate and installed vertically inside the fixing body, and the lower end is A fixed lifting means, a moving body in the shape of a square cylinder that is inserted into the upper space of the fixture to move up and down, and a fixed plate fixed to the lower end of the moving body and having a shaft hole in the center and a lifting means guide hole on both sides, A rack guide plate integrally fixed to the lower end of the fixing plate and having a rack guide hole and a lifting means guide hole formed on both sides of each side forming a seating groove in which the rack and pinion gear are seated, and a rack guide plate formed integrally with the pinion gear. An elevating table device comprising a vertically fixed rotation shaft and a table formed with a lever groove on which a rotation lever coupled to the rotation shaft through a shaft hole formed in the center and coupled to a fixing part formed on the upper part of the moving body is placed. Has been done.

In addition, as in Patent Publication No. 2013-0049655, a top plate bracket bolted to the lower side of the top plate, a leg member spaced apart from the lower side of the top plate bracket, an inner post connected to the leg member standing upright, and the outer side of the inner post. An outer post disposed in the upper plate and connected so as to be interlocked with the upper plate so as to move up and down according to the stroke operation of the cylinder disposed inside the inner post, and a lever disposed on the upper plate bracket to operate the cylinder according to the operation of the lever A table consisting of operating parts has been devised.

Then, as in Registered Patent No. 10-1355604, the bottom surface of the upper plate and the upper end of the lower support that descend through the buffer band installed on the upper plate, the height post and the pedestal are fundamentally blocked from colliding with each other, thereby minimizing noise and cracking. A table has been created and registered so that it can be done.

In addition, the lifting means applied to the height adjustment table as described above generally uses a gas cylinder, and when the operating pin protruding from the tip of the gas cylinder is pressurized, the cylinder shaft that was compressed and inserted into the gas cylinder rises. As a result, the upper plate coupled to the cylinder shaft rises, and as the upper plate is pressed downward while the operation pin is pressed, the height of the upper plate can be adjusted.

That is, as shown in FIGS. 1 and 2, in the existing height adjustment table, the lower support 210 is vertically installed on the upper support 200 to which the caster 201 is coupled, and the lower support 210 ) To the upper inner side of the lifting posts 220 is inserted, and the top plate 240 is fixed to the front end of the lifting posts 220 using a cover body 230.

At this time, a gas cylinder 250 is built into the lower post 210 and the lifting post 220, and the lower end of the gas cylinder 250 is on the bottom of the lower post 210 or on the lower support 200. It is fixed to the front end of the cylinder shaft 251 is coupled to the cover body 230 and the upper plate 240 through the fixture 260 in the cover body 230, so that the cylinder shaft 251 is raised. When the upper plate 240 is raised including the lifting posts 220.

In addition, a hinged operation lever 270 is mounted on one side of the bottom surface of the upper plate 240, and the operation lever 270 is a rotary pressing tool 280 and a cable hinged to the fastener 260. It is connected through 290, and when the operation lever 270 is pressed and rotated, the cable 290 is pulled and the rotary pressurizing port 280 is rotated downward, and the rotary pressurizing port 280 As a result, the operation pin 252 of the gas cylinder 250 is pressed, and the cylinder shaft 251 and the upper plate 240 are lifted due to the pressing of the operation pin 252.

Therefore, when the operating lever 270 is pressed to reach an appropriate height while the top plate 240 is rising, the pressing force of the operating lever 270 is released to stop the rising action of the top plate 240, and the elevated top plate ( In the case of lowering the 240, the upper plate 240 is strongly pressed and the operation lever 270 is operated so that the cylinder shaft 251 is inserted and compressed into the gas cylinder 250 by an artificial force. It is made so that the height of the upper plate 240 can be adjusted.

However, in the conventional upper plate height adjustment structure as described above, one end of the cable connected to the operating lever is oriented in the vertical direction due to the structure of the operating lever, and the other end of the cable is also coupled in a vertical direction with respect to the rotary presser. Inevitably, the above cable has no choice but to produce a hanging shape under the upper plate.

Then, when the cable is stretched as described above, the operating responsiveness of the gas cylinder is deteriorated due to the operating margin and error due to the stretched cable, and as the responsiveness to the gas cylinder is lowered, the moving distance or operating distance of the cable Since it is necessary to increase the size of the operation lever, as well as the amount of rotational movement of the rotary pressurization tool should be proportionally increased, there is a problem in that the size of the related component inevitably increases.

In addition, the cover body can also be made in an unnecessarily large and high shape to accommodate the connection part between the cable and the rotating presser in the vertical direction and the bending space of the cable, so the lower part of the top plate looks very messy. It has a problem.

In particular, since the upper plate cannot be lowered by the height occupied by the cover body as described above, it is only possible to manufacture the upper plate as a table having a height of a certain level or higher.If you want to lower the minimum height of the upper plate, the length of the gas cylinder is Because it is shortened, it has a closed end where the maximum height of the top plate is rather lowered due to stroke loss.

In addition, when the above table is used while sitting on a chair, it is very cumbersome because the cover body and the cable interfere with the user's leg, and if the cable is touched incorrectly, the top plate suddenly malfunctions and rises. It is very big.

Korean Patent Registration 10-1200827 (registered on November 7, 2012) Republic of Korea Patent Publication 10-2013-0049655 (published on May 14, 2013) Korean Patent Registration 10-1355604 (registered on January 20, 2014)

The present invention is to improve the above-described problem, forming a fixing support coupled to the tip of the lifting post, and forming a combination of a fixing actuating tool and a pressure fastener coupled to the cylinder shaft tip of the gas cylinder on the upper portion of the fixing support, the In the other end of the cable coupled in the transverse direction with respect to the fixed operating tool, an actuating lever body that pulls the cable in the transverse direction is fixedly formed,

Cables with horizontal connection in the transverse direction have excellent operational responsiveness, so the height of the upper plate can be adjusted more quickly and accurately by the gas cylinder, and the gas cylinder operating means and support means located at the lower part of the upper plate are concise. Therefore, it is an object of the present invention to provide a height adjustment table so as to minimize interference or contact in the process of use, as well as to produce a simpler and more concise aesthetic sense in appearance.

In the present invention for achieving the above object, the lower post is coupled to the upper side of the lower support having a caster, and the lifting post with the upper plate coupled to the tip is inserted into the upper inner side of the lower post, and the lower post and In the height adjustment table configured to adjust the height of the upper plate up and down through the operation of the gas cylinder by means of a lever assembly and a cable connected to one side of the bottom of the upper plate by inserting and installing a separate gas cylinder inside the lifting post,

The additionally provided fixing support is coupled to the upper end of the lifting post, and a fixing groove is formed on the upper part of the fixing support to insert and fix the fixing actuating tool and the pressure fixing tool into which the fixing shaft is inserted in the transverse direction,

The fixing actuating mechanism has the cylinder shaft end of the gas cylinder fixed at the lower side, and at one side of the fixing actuating tool hinge-coupled a rotation presser that interferes with the upper actuating pin of the cylinder shaft end, and both ends of the cable are It is configured to be coupled and fixed to the rotation presser and the operating lever in the transverse direction.

In the present invention, the operation cable arranged in a straight line has no sagging or bending, so that the operation responsiveness of the gas cylinder is greatly improved, and the flow distance of the cable is shortened, so that the design of the minimum volume for the gas cylinder operation means including the operation lever It is simple and concise in appearance because the cable receiving means and operating means including cables are almost in close contact with the bottom of the top plate, and it is more efficient because there is no unnecessary waste of space under the top plate. Contact can be minimized.

1 is an overall configuration diagram of a conventional height table
2 is an enlarged view of an operation part for a conventional elevator table
3 is an overall configuration diagram of a height table according to the present invention
Figure 4 is an exploded perspective view of the main part of the elevating table according to the present invention
5 is an enlarged exploded perspective view of the main part of the elevating table according to the present invention
6 is a cross-sectional view of an operation part of a height table according to the present invention
7 is an enlarged cross-sectional view of an operation part of the elevation table according to the present invention
8 is an explanatory view of the operation of the operation unit of the elevator table according to the present invention
9 is an exploded perspective view showing another embodiment of a height table according to the present invention
10 is a perspective view of a combined state according to FIG. 9
11 is an enlarged cross-sectional view showing another embodiment of a height table according to the present invention

Additional objects, features, and advantages of the present invention may be more clearly understood from the following detailed description and accompanying drawings.

Prior to the detailed description of the present invention, the present invention is capable of various modifications and various embodiments, and the examples described below and shown in the drawings are intended to limit the present invention to specific embodiments. It should be understood as including all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

In addition, when a component is referred to as being "connected" or "connected" to another component, it may be directly connected or connected to the other component, but other components may exist in the middle. It should be understood that there is. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

Subsequently, the terms used in the present specification are used only to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or a combination thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

In addition, terms such as "... unit", "... unit", and "... module" described in the specification mean a unit that processes at least one function or operation, which is hardware, software, or hardware and It can be implemented as a combination of software.

In addition, in the description with reference to the accompanying drawings, the same reference numerals are assigned to the same components regardless of the reference numerals, and redundant descriptions thereof will be omitted. In describing the present invention, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is an overall configuration diagram of the elevating table according to the present invention, FIG. 4 is an exploded perspective view of the main parts of the elevating table according to the present invention, and FIG. 5 is an enlarged exploded perspective view of the main parts of the elevating table according to the present invention, and FIG. A cross-sectional view of the operation part of the elevator table according to the present invention, FIG. 7 is an enlarged cross-sectional view of the operation part of the elevator table according to the present invention.

As shown in the figure, the height adjustment table according to the present invention is to overcome the problems of the existing height adjustment table, and the lower support body 100 having a plurality of casters 101 on the bottom surface is provided as before. In addition, a vertical lower column 110 is fixedly coupled to the upper side of the lower support body 100.

In addition, a gas cylinder 170 having a lower end coupled to the lower support 100 or the lower post 110 is inserted inside the lower post 110, and the gas cylinder 170 is usually It is widely used in height-adjustable chairs, etc., and a cylinder shaft 171 protruding upward and downward from the gas cylinder 170 is inserted at the front end, and the gas cylinder 170 inside the front end of the cylinder shaft 171 The operation pin 172 for controlling the gas of the protrusion is formed, and when the operation pin 172 is pressed, the cylinder shaft 171 is automatically protruded with the maximum length, and the operation pin 172 ) Is pressed and the cylinder shaft 171 is depressed downward, and the actuating pin 172 is depressed during the downward depression of the cylinder shaft 171. When it occurs, the depression of the cylinder shaft 171 is stopped and the position is fixed.

Subsequently, a separate lifting post 120 is inserted into the upper inner side of the lower post 110, and a separate fixing support 140 is coupled and fixed to the front end of the lift post 120, and the fixing paper The upper plate 130 having various thicknesses and shapes is fixed to the upper side of the earth 140.

At this time, the mounting groove portion 141 is formed on the upper portion of the fixing support 140, and a separate fixing operation device 150 and a pressure fixing device 160 are sequentially inserted into the mounting groove part 141. , The front end of the cylinder shaft 171 is screwed to the lower side of the fixing operation unit 150, and the fixing operation unit 150 is a mounting groove part 141 of the fixing support 140 by a pressure fixing unit 160 It is inserted and fixed within.

In other words, the fixing shaft 151 is inserted in the horizontal direction at the top of the fixing actuating tool 150, the screw groove 153 is formed at the bottom, and a separate rotary pressing tool 152 is hinged on one side. As such, the fixing shaft 151 is to allow the fixing operation unit 150 to be inserted and positioned in the receiving groove 141 of the fixing support 140, and the screw groove 153 of the cylinder shaft 171 The front end is screwed, and the rotary presser 152 has one end of the cable 181 fixed to the front end, and the lower end of the rotary presser 152 is a cylinder shaft inserted into the screw groove 153 ( 171) It is in contact with the upper actuating pin 172 of the front end, in the end, the fixing actuating port 150 is an entity connecting the cylinder shaft 171 and the upper plate 130, and at the same time, the cable 181 and the rotating presser ( It can be seen as a key entity to adjust the height of the upper plate 130 by pressing the operation pin 172 of the cylinder shaft 171 by 152.

Then, in a state in which the fixing actuating tool 150 is inserted into the receiving groove 141 of the fixing support 140, a separately provided pressure fixing unit 160 is placed on the upper side of the fixing actuating tool 150, and then the receiving groove part The fixing actuating tool 150 is firmly located in the receiving groove 141 through the fixing of the bolts of the pressure fixing tool 160 against the 141.

In this case, pressing protrusions 161 are formed at both lower sides of the pressure fixing unit 160 so as to be positioned on both upper sides of the fixing shaft 151, and when fixing the bolts of the pressing fixing unit 160, the pressing protrusions ( 161 is to strongly press down the fixed shaft 151 of the fixed operation unit 150, in the end, the fixed operation unit 150 is capable of rotational flow from the fixed axis 151, but in the vertical direction. The flow is combined and fixed to an impossible state.

This means that when the cable 181 coupled to the upper end of the rotary presser 152 is pulled by an artificial force, the rotational force of the rotary presser 152 and the interference between the operation pin 172, etc. 150) is to be prevented from being completely transmitted, and as a certain amount of rotational flow force is applied to the fixed operation unit 150, the fixed operation unit 150 is active during the pulling or returning process of the cable 181. While rotating to the cylinder shaft 171 and the coupling portion with the fixing support 140, it is possible to obtain a smoother operating state as the unreasonable support does not occur.

Subsequently, a separate lever assembly 180 is fixed to one side of the bottom surface of the upper plate 130, and the other end of the cable 181 coupled to the rotation presser 152 of the fixing operation unit 150 is the It is inserted into the inside through the side of the lever assembly 180 is coupled and fixed to the end of a separate operating lever 182.

Here, the operation lever 182 is coupled to the intermediate portion so as to be rotatable from the lever assembly 180 by a separate hinge shaft portion 183, a separate spring inserted into the hinge shaft portion 183 Since both ends of the sieve 184 are elastically supported by the lever assembly 180 and the actuating lever 182, respectively, the actuating lever 182 and the cable 181 are elastically supported by the spring body 184. The opposite end, which is not engaged, is continuously receiving the force to rotate downward.

Therefore, as the operation pin 172 of the cylinder shaft 171 protrudes, the rotation presser 152 mounted on the operation pin 172 maintains a state in which the tip is retracted and rotated. One end of the actuating lever 182 is also rotated downwardly, and these rotation presses 152 and the actuating lever 182 are connected and fixed in a straight line through a cable 181 in the transverse direction.

Accordingly, in the case of adjusting the height of the upper plate 130, the user grasps the operation lever 182 or lifts it upward, and the cable 181 coupling portion rotates downward and pulls the cable 181. At the same time as the cable 181 is pulled, the cylinder shaft 171 is depressed by the rotational action of the rotation presser 152 and the operation pin 172 as shown in FIG. 8. ), while rapidly protruding upward, to lift the upper plate 130.

In addition, even if the height of the upper plate 130 is to be lowered, the operation lever 182 is rotated upward so that the operation pin 172 is pressed, and then more than the protrusion force of the cylinder shaft 171 As the pressing force is applied to the upper plate 130, the cylinder shaft 171 is forcibly inserted into the gas cylinder 170, and the above operation is made when the appropriate height of the upper plate 130 is made in the insertion process. When the lever 182 is released, the cable 181 is pushed into its original position due to the protruding force of the operation pin 172 and the elastic force of the spring body 184, and the operation pin 172 is completely protruded. As the protrusion of 172 makes it impossible to move gas in the cylinder, the height of the upper plate 130 can be fixed.

As such, since the cable 181 is connected to the rotation presser 152 and the operation lever 182 in a straight line, unlike the conventional one, the rotary presser 152 can be made only by rotating the operation lever 182 small. Since a large number of rotation angles can be obtained, structural simplicity as well as convenience in use can be obtained, and the responsiveness of the rotary presser 152 and the operation pin 172 can be improved due to the connection in a straight line. It is possible to quickly and accurately adjust the height of the upper plate 130.

In addition, it is possible to solve problems such as the cable 181 being stretched and messy, causing interference or jamming with the user's leg or other items, and the fixing support 140 is also a cable that is coupled in the transverse direction. Since the 181 and the fixing operation tool 150 and the pressure fixing tool 160 therefor need only be manufactured at a height enough to be accommodated in the receiving groove 141, there is no need to be made unnecessarily large and thick like the existing cover body, so the table In addition to expanding the available space below the table, the table is more concise and simple.

The height adjustment table of the present invention has a separate protective tube 190 having an inner diameter larger than the outer diameter of the lower column 110 and the lifting posts 120 are accommodated at the lower end of the fixing support 140 as described above. As the coupling is formed, as shown in FIGS. 9 and 10, it is possible to prevent the lifting pole 120 from being directly exposed to the outside due to the protective tube 190, as well as foreign substances inside through the tip of the lower pole 110. It can also prevent the back from entering.

In addition, as shown in Fig. 11, as a rolling bearing 191 made of a ball or roller is inserted between the outer surface of the lifting post 120 and the inner surface of the lower post 110, the upper and lower parts of the lifting post 120 It can also be configured so that smoother and quieter operation can be achieved during the lifting process.

As described above, the height adjustment table according to the present invention uses a straight cable connection structure unlike the existing one, so that it can be designed and installed simply with the minimum occupied space for the lifting means of the upper plate as well as faster and more accurate response. Together, it is excellent in manufacturing convenience, and it creates more concise and luxurious features in appearance.

The configurations shown in the embodiments and drawings as described above are only the most preferred embodiment of the present invention, and do not represent all the technical spirit of the present invention, so various equivalents and modifications that can replace them It should be understood that there may be examples.

100: lower support 101: caster
110: lower holding
120: lifting post
130: top plate
140: fixing support 141: anchoring groove
150: fixed operating port 151: fixed shaft
152: rotary presser 153: screw groove
160: pressure fixing port 161: pressing protrusion
170: gas cylinder 171: cylinder shaft
172: operation pin
180: lever assembly 181: cable
182: operating lever 183: hinge shaft part
184: spring body
190: protective tube 191: bearing

Claims (6)

The lower post 110 is coupled to the upper side of the lower support 100 having the caster 101, and the lifting post 120 is inserted into the upper inner side of the lower post 110 to which the upper plate 130 is coupled to the tip. The lever assembly 180 and the cable 181 are coupled to one side of the bottom of the upper plate 130 by inserting and mounting a separate gas cylinder 170 inside the lower post 110 and the lifting post 120 In the height adjustment table configured to adjust the height of the upper plate 130 up and down through the operation of the gas cylinder 170 by,
The separately provided fixing support 140 is coupled to the upper end of the lifting post 120, and the fixing shaft 151 is inserted in the transverse direction by forming an anchor groove 141 on the upper part of the fixing support 140 The fixed operation unit 150 and the pressure fixing unit 160 are inserted and fixed in the settling groove 141,
The fixing actuating tool 150 has the upper end of the cylinder shaft 171 of the gas cylinder 170 fixed at the lower side, and the upper actuating pin 172 at the tip of the cylinder shaft 171 at one side of the fixing actuating tool 150 Hinge-coupled the rotary presser 152 to interfere with, and both ends of the cable 181 are the rotary presser 152 of the fixed operation unit 150 and the operation lever 182 of the lever assembly 180, respectively. Height adjustment table with an improved operating structure, characterized in that configured to be fixed in the transverse direction.
The method of claim 1,
A screw groove part 153 is formed on the lower side of the fixing operation tool 150 to allow the tip of the cylinder shaft 171 to be screwed, and a cable 181 at the tip of the rotation presser 152 of the fixing operation tool 150 One end of the screw is fixed, and the lower end of the rotary presser 152 is brought into contact with the upper surface of the operating pin 172 of the cylinder shaft 171 located inside the screw groove 152,
When the operating pin 172 is raised, the front end of the rotation presser 152 is rotated in the retreat direction from the lever assembly 180, and when the cable 181 is pulled, the rotation presser 151 ), the lower end of the rotation presser 151 presses the operation pin 172 downward by rotation in the forward direction of the gas cylinder 170 so that the upward protrusion of the cylinder shaft 171 with respect to the gas cylinder 170 is performed. Height adjustment table with an improved operating structure.
The method of claim 1,
Pressing protrusions 161 for pressing both upper sides of the fixing shaft 151 of the fixing actuating tool 150 are formed at both sides of the lower side of the pressing fixing unit 160, so that the pressing fixing unit 160 is provided with the receiving groove 141. Height adjustment table having an improved operation structure, characterized in that the fixed shaft 151 is configured to be closely fixed by the pressing of the pressing protrusion 161 as it is inserted and fixed in the inside.
The method of claim 1,
The end of the cable 181 introduced into one side of the lever assembly 180 is coupled and fixed to one end of the operating lever 182, and the operation lever 182 is configured to be rotated from the hinge shaft portion 183 of the intermediate portion. But,
The hinge shaft portion 183 has a lever assembly 180 and a spring body 184 locked to the operating lever 182, respectively, at both ends, and the cable 181 by the elastic force of the spring body 184 Height adjustment table having an improved operating structure, characterized in that the end of the operating lever 182 on the opposite side is configured to maintain a downwardly rotated state.
The method of claim 1,
At the bottom of the fixing support 140, a tip of the protective tube 190 with an inner diameter larger than the outer diameter of the lower column 110 is fixedly formed, so that the upper side of the lower column 110 is inserted under the protective tube 190 Height adjustment table having an improved operating structure, characterized in that the upper plate 130 and the lifting posts 120 are configured to be raised and lowered up and down.
The method of claim 1,
A bearing 191 is inserted between the inner surface of the lower column 110 and the outer surface of the elevator column 120 so that the up and down movement of the elevator column 120 can be made more smoothly by the bearing 191. Height adjustment table with an improved operating structure, characterized in that the configuration.

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