KR200478652Y1

KR200478652Y1 - A standing table

Info

Publication number: KR200478652Y1
Application number: KR2020150002128U
Authority: KR
Inventors: 김승호
Original assignee: 주식회사 에스엠티
Priority date: 2015-04-03
Filing date: 2015-04-03
Publication date: 2015-11-02

Abstract

The standing table is started. A standing table according to an embodiment of the present invention includes an upper plate including a main plate and an auxiliary plate that can be positioned on the same plane; A height adjusting unit arranged to vary a height of the assisting plate to an upper portion of the main plate; And an inclination adjusting unit provided to vary the inclination of the auxiliary plate with respect to the main plate.

Description

{A standing table}

The present invention relates to a standing table provided for a comfortable operation in a sitting posture as well as a sitting posture.

A table that can be used for a desk or a work table is usually fixed to the height of the top plate in a sitting position.

However, the table with the fixed height of the top plate was inconvenient to use for a long time because the crowd could easily go to the neck or waist when sitting for a long time in a sitting posture.

Therefore, in recent years, the height of the top plate can be adjusted so that a stand type in which a table can be used comfortably in a sitting position as well as in a standing position can be achieved.

Japanese Patent Application Laid-Open No. 10-2012-0129041 discloses an example of a standing table provided to adjust the height of a top plate.

Published patent application No. 10-2012-0129041

However, the conventional standing table, which is provided to adjust only the height of the upper plate in parallel with the ground, can not provide a supporting surface having an inclination, and thus has a limitation in being conveniently used in various operations.

In addition, while the space used for actual work in a normal table is mostly a part of the upper plate, since the conventional standing table adjusts the height of the entire upper plate, the operation efficiency of raising and lowering the upper plate for adjusting the height of the upper plate There has been a limit to making such improvements.

An embodiment of the present invention is to provide a standing table provided so as to be able to adjust not only the height of the work space but also the inclination, thereby improving the convenience of the work.

Further, the present invention provides a standing table for improving the operation efficiency according to height or inclination of a work space.

According to an aspect of the present invention, there is provided an upper plate, comprising: a top plate including a main plate and an auxiliary plate that can be positioned on the same plane; A height adjusting unit arranged to vary a height of the assisting plate to an upper portion of the main plate; And an inclination adjusting unit provided to vary the inclination of the assisting plate relative to the main plate.

The main body frame is provided at the bottom of the upper plate, and the auxiliary frame is provided at the bottom of the auxiliary plate. The height adjusting unit includes a pair of rotatably intersecting X- Wherein one of the pair of link arms constituting the cross arm is rotatably coupled to the auxiliary frame at an upper end and the other end of the link arm is horizontally And the other end of the pair of link arms is rotatably coupled to the main frame and the other end of the link arm is slidably coupled to the auxiliary frame in the horizontal direction, The positions of both ends of the pair of link arms constituting the link arm are aligned on the same line .

Wherein a pair of link arms constituting the cross arm are connected to each other through a shock absorber, and both ends of the shock absorber are connected to one side of an intersection of the pair of link arms at an upper portion and a lower portion of the intersection, respectively And both ends of the shock absorber can be disposed so that one end is closer to the intersection than the other end.

Wherein the height adjustment unit includes a height adjustment lock lever provided to allow or block the rotation between the pair of link arms constituting the cross arm and the height adjustment lock lever is configured to be operated by both hands .

Wherein the height adjusting unit includes a height adjusting locking device provided to allow or block the rotation between the pair of link arms constituting the crossarm, wherein the locking device comprises a pair of link arms A second latching portion provided on the auxiliary frame so as to be engaged with the first latching portion and a second latching portion provided on either one of the first latching portion and the second latching portion, And a height-adjusting lock lever.

And the inclination adjusting unit includes a tilt adjusting lock lever having a knob portion for allowing or blocking rotation of the assisting plate relative to the sub frame, the inclination adjusting lock lever being located on the back surface of the assisting plate, And an operation hole penetrating through the auxiliary plate corresponding to the position of the handle so that the handle can be held by the hand from the upper part of the auxiliary plate.

The auxiliary plate is rotatably coupled to the auxiliary frame, and the inclination adjusting unit includes a latch disposed at the bottom of the auxiliary plate so as to be elastically supported in a direction of increasing the inclination of the auxiliary plate, and a plurality of slides And a plurality of second hooking grooves arranged in parallel at the same intervals as the plurality of first hooking grooves so that the second hooking grooves are in contact with the first hooking groove And a pressing means provided to press the sliding member in a direction opposite to an elastic supporting direction of the latch. The sliding member may be slidably mounted on the latching plate so as to be aligned with the latching plate.

The stand table according to the embodiment of the present invention can vary the height of the work space as well as the inclination according to the user's intention, thereby improving the convenience of using the standing table.

In addition, since the stand table according to the present embodiment can adjust the height and inclination of the work space by elevating or tilting the auxiliary plate forming part of the upper plate, the height and the inclination of the work space can be adjusted with less force, The operation efficiency according to the height or the inclination of the work space can be improved.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view of a standing table according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a state where the standing cable of FIG. 1 is viewed from the bottom side.
Fig. 3 shows a state in which the auxiliary plate of the upper plate is raised in the state of Fig.
Fig. 4 shows a state in which the auxiliary plate of the upper plate is erected so as to be inclined in the state of Fig. 3;
5 is a partial side view showing a structure of a height adjusting unit side in a standing table according to an embodiment of the present invention.
FIG. 6 shows a state in which the auxiliary plate of the upper plate is lowered in the state of FIG. 5;
FIG. 7 is a perspective view of a standing table according to an embodiment of the present invention, in which the structure of a cross arm of a height adjusting unit is exploded. FIG.
FIG. 8 is a perspective view illustrating a bottom structure of an assisting plate in a standing table according to an embodiment of the present invention, in which the assisting plate is supported horizontally on the sub frame.
Fig. 9 shows a state in which the auxiliary plate is erected so as to be inclined in the state of Fig. 8;
FIG. 10 is a side view of a standing table according to an embodiment of the present invention, which is an excerpt view of the structure of the inclination adjusting unit.
Fig. 11 shows a state in which the lock state of the tilt adjustment unit is released by operating the lock lever for controlling the tilt in the state of Fig. 10;
Fig. 12 shows a state in which the inclination of the assisting plate is adjusted to be larger in the state of Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the idea of the present invention to a person having ordinary skill in the art to which the present invention belongs. The present invention is not limited to the embodiments shown herein but may be embodied in other forms. In order to clarify the present invention, it is to be understood that the drawings are not to scale, and the size of the components may be slightly exaggerated in order to facilitate understanding.

1 to 4, the standing table according to the present embodiment includes an upper plate 1 and a plurality of support legs 4 for supporting the upper plate 1 from the ground.

The support legs 4 may be connected to each other through the side plate 5, but it is preferable that the front side support legs 4 are opened without the side plate 5 in case of using a chair.

In the drawings, the upper plate 1 is provided in a rectangular shape as it is applied to an ordinary table, but there is no particular limitation on the shape of the upper plate such as a circle, a triangle and a pentagon, and the material of the upper plate is also various materials such as wood, plastic, metal, Lt; / RTI > That is, the shape and material of the upper plate 1 can be configured through various shapes and materials according to the purpose of use of the standing table and the design desired by the manufacturer.

The upper plate 1 is configured to include the main plate 2 and the auxiliary plate 3 and the main plate 2 and the auxiliary plate 3 are provided so as to be positioned on the same plane.

In the present embodiment, the main plate 2 is provided with a cutting groove 2a at a front center portion thereof, and the auxiliary plate 3 is disposed in the form of filling the inside of the cutting groove 2a so that the main plate 2, (1).

Alternatively, the auxiliary plate 3 may be positioned rearward or laterally of the main plate 2, or may be further protruded sideways than the main plate 2.

The height of the auxiliary plate 3 can be changed to the height of the main plate 2 through the height adjusting unit 10. [

A main frame 6 is provided at the bottom of the upper plate 1 and an auxiliary frame 7 is provided at the bottom of the auxiliary plate 3 and a pair of height adjustment is provided between the main frame 6 and the auxiliary frame 7. [ The unit 10 can be disposed on both sides.

The main frame 6 may be provided in the form of a lattice frame connecting between the support legs 4 at the bottom of the upper plate 1. The auxiliary frame 4 may be a lattice- And can be provided in a frame form.

5 to 7, the height adjusting unit 10 may be configured to include a cross arm 20 provided so as to foldably connect the body frame 6 and the auxiliary frame 7 first And the cross arms 20 can be constituted by a pair of link arms 30, 40 which are rotatably crossed with each other in an X-shape.

The pair of link arms 30 and 40 constituting the cross arm 20 are rotatably coupled at one end to the auxiliary frame 7 and at the other end to be slidably coupled to the body frame 6 in the horizontal direction A first link arm 30 and a second link arm 40 having a lower one end rotatably coupled to the main frame 6 and a second upper end connected to the auxiliary frame 7 so as to be slidable in the horizontal direction .

The first horizontal rail 6a may be formed on one side of the main body frame 6 so that the lower end of the first link arm 30 is slidably coupled in the horizontal direction, The second horizontal rail 7a may be formed at one side of the auxiliary frame 7 corresponding to the second link arm 40 so that the upper end of the second link arm 40 is slidably coupled in the horizontal direction.

Therefore, the auxiliary plate 3 can be stably raised and lowered according to the folding operation of the cross arm 20, and the height thereof can be varied.

In order to allow the auxiliary plate 3 to move up and down in its position without being moved in the horizontal direction during the folding operation of the cross arm 20, both ends of the pair of link arms 30, 40 constituting the cross arm 20 Are preferably arranged so as to be located on the same line along the vertical direction.

Therefore, the auxiliary plate 3, which is operated to move up and down without being moved in the horizontal direction, does not need to secure a separate space in the front and rear directions, which is advantageous in terms of space utilization.

In addition, a shock absorber 50 may be employed for the cross arm 20 so that the ascending / descending operation of the assisting plate 3 can be stably performed in a vibration-free state.

At this time, it is possible not to interfere with the sliding operation of the link arms 30, 40 constituting the cross arm 20, but also to make it possible to perform effective buffering action over the entire duration of the folding section of the cross arm 20, 3) so that the shock absorber 50 can maintain the state adjacent to one link arm The shock absorber 50 is rotatably coupled to the upper and lower portions of the intersection of the pair of link arms 30 and 40 at opposite ends thereof, (30, 40).

In FIG. 7, reference numeral 21 denotes a hinge pin for rotatably connecting the intersection between the link arms 30 and 40, and 51 and 52 denote rotation of both ends of the shock absorber 50 () To the rotational coupling pin.

The height adjusting unit 10 may include a height adjusting locking device 60 provided to allow or block the rotation between the pair of link arms 30 and 40 constituting the cross arm 20, The locking device 60 includes a first engaging part 70 provided on the first link arm 30 of the first and second link arms 30 and 40 constituting the cross arm 20, A second locking portion 80 provided on the auxiliary frame 7 so as to be engaged with the first and second locking portions 70 and 70 and a height adjustment locking lever 90 provided to switch the engagement and disengagement states between the first and second locking portions .

The height adjustment lock lever 90 has a handle 91 disposed at the front bottom of the assistance plate 3 substantially in parallel with the front side of the assistance plate 3 and a handle 91 extending from the outer end of the handle 91 to the inside And an operation portion 92 which is bent and extended to the left side. The actuating part 92 may be rotatably coupled to the auxiliary frame 7 in the up-and-down direction through the first rotation shaft 93 at the end thereof.

The first locking part 70 may be formed in a fan shape and fixed to the upper end of the first link arm 30. A first locking part 70 of the fan shape is provided with a locking groove 71 may be provided. The engaging grooves 71 may be formed along the bottom of the first engaging portion 70.

The second locking part 80 may be rotatably coupled to the auxiliary frame 7 between the first rotation shaft 93 and the first locking part 70 through the second rotation shaft 81. A plurality of locking protrusions 82 may be provided on one side of the second rotation shaft 81 so as to be caught in the locking recess 71 on the side of the first locking portion 70, The latching bar 83 can be extended to the side of the operating lever 92 so as to be engaged with the operating portion 92 of the height adjusting lock lever 90. The second engaging part 80 may be provided such that the engaging protrusion 82 side is elastically supported toward the engaging groove 71 through an elastic member (not shown), and one end of the elastic member (not shown) 7, and the other end of which is supported by the second latching portion 80. The torsion spring may be a spring.

Accordingly, when the user holds the handle 91 of the height-adjusting lock lever 90 by hand and lifts it up toward the back side of the assisting plate 3, the second engaging portion 80 is rotated around the second rotation shaft 81, The hooking projections 82 on the other side of the second hooking portion 80 are lowered to the bottom of the hooking groove 83 of the second hooking portion 80 so that the engagement of the hooking projections 82 with respect to the hooking groove 71 is released . Therefore, at this time, as the rotation between the link arms 30, 40 constituting the cross arm 20 is allowed, the auxiliary plate 3 is raised and lowered through the folding operation of the cross arm 20,

In this state, when the user lifts the auxiliary plate 30 to a desired height, the user removes the force applied to the handle 91 of the height-adjusting lock lever 90, The latching bar 83 on one side of the second latching part 80 is lowered with the center of the second latching part 81 being lowered while the latching projections 82 on the other side of the second latching part 80 are lifted up, So that the lifting operation of the assisting plate 3 can be maintained in the locked state.

As described above, in the stand table according to the present embodiment, the pair of height adjusting lock levers 90 disposed on both sides of the assisting plate 30 are provided on both sides of the right and left sides of the height adjusting unit 10, It is possible to prevent the one hand from being caught between the auxiliary plate 3 and the cutout groove 2a during the ascending and descending operation of the auxiliary plate 3, It is advantageous to secure the safety of lifting and lowering the auxiliary plate 3 accordingly.

Further, the standing table may be further provided with a tilt adjusting unit 100 provided to vary the inclination of the auxiliary plate 3 with respect to the main plate 2.

The auxiliary plate 3 may be rotatably coupled to the front side of the auxiliary frame 7 through the hinge member 110 on the front side. Therefore, the auxiliary plate 3 can be rotatably supported on the auxiliary frame 7 in a state where the front is hinged to the auxiliary frame 7.

The inclination adjusting unit 100 includes a latch 120 positioned at the bottom of the assisting plate 3 so as to be elastically supported in a direction of increasing the inclination of the assisting plate 3, a plurality of first hooking grooves 130a, 130b, and 130c, and a plurality of second hooking grooves 130a, 130b, and 130c arranged side by side at the same intervals as the plurality of first hooking grooves 130a, 130b, and 130c, A sliding member 140 slidably mounted on the latching plate 130 so that the second latching grooves 140a can be aligned with the first latching grooves 130a 130b 130c, And a pressing means 150 configured to press and slide the sliding member 140 in a direction opposite to the elastic supporting direction of the latch 120. [ Here, when the first and second hooks are aligned in the aligned state, it means that the first and second hooks can be engaged with the latches 120 together.

The latch 120 includes a hook 121 which is horizontally arranged to be substantially engaged with the hooking groove 121 and a pair of support bars 122 extending perpendicularly to both ends of the hooking bar 121 . A fixing bracket 129 may be installed inside the auxiliary frame 7 for installing the latch 120. The latch 120 may have a fitting protrusion 122a which is laterally extended at both ends of the supporting bar 122, And can be fixed to the fixing bracket 129 while being rotatably coupled to the bracket 129. An elastic member (not shown) may be provided on at least one of the fitting protrusions 122a so that the latch 120 is elastically supported in a direction of increasing the inclination of the supporting plate 3. One end of the elastic member And a torsion spring fixed to the bracket 129 and the other end fixed to the latch 120.

The engaging plate 130 includes an upper plate 131 coupled to the back surface of the auxiliary plate 3 through a fastening member such as a screw and a pair of side plate portions 132 extending vertically in parallel to both sides of the upper plate 131 can do. The side plate portion 132 may extend a little longer in the front and rear directions of the auxiliary plate 3 and the first latching grooves 130a, 130b, and 130c may be formed on the side plate portions 132 along the longitudinal direction of the side plate portion 132 And may be formed to be spaced apart from each other by a predetermined distance. In the present embodiment, the first latching grooves 130a, 130b, and 130c are formed on the respective side plate portions 132 by three. The first hooking grooves 130a, 130b and 130c are formed on both sides of the first and third groups 130a and 130c along the sliding direction of the sliding member 140 and between the first and third groups 130a and 130c And a second group 130b located in the second group 130b.

The sliding member 140 may be provided with a pair of sliding plates 141 disposed between the pair of side plate portions 132 in parallel with the side plate portion 132. The pair of sliding plates 141 can be coupled to the upper plate 131 of the latching plate 130 so as to be slidable in the longitudinal direction of the latching plate 130 while being connected to each other.

Each of the sliding plates 141 may have a plurality of second hooking grooves 140a formed at intervals equal to the intervals between the first hooking grooves 130a, 130b and 130c. Two second hooking grooves 140a may be provided for each sliding plate 141. [ The side plate portion 132 of the latching plate 130 provided with the first latching grooves 130a, 130b and 130c and the second latching groove 130c of the latching plate 130 are provided so that the latching rods 121 of the latching plate 120 can be stably hooked, A pair of sliding plates 1410 of the sliding member 140 formed with the side plates 132 and the sliding plates 141 may be formed.

The pushing means 150 includes a slant adjusting lock lever 160 and a link member 160 provided to push the slidable member 140 in a direction opposite to the elastic supporting direction of the latch 120 as the slant adjusting lock lever 160 is operated. (Not shown).

The inclination adjusting lock lever 160 includes an actuating portion 161 rotatably coupled to the side plate portion 132 in a direction perpendicular to the longitudinal direction of the engaging plate 130, And a handle 163 that is bent and extended to one end of the connection part 162 and is provided in parallel with the operation part 161. [ The inclination adjusting lock lever 160 may be installed on the holding plate 130 such that the handle 163 is elastically supported to the bottom of the supporting plate 3 through an elastic member (not shown). The elastic member (not shown) may be provided with a torsion spring whose one end is supported by the actuating part 161 and the other end is supported by the engagement plate 130.

The link member 170 includes a first link 171 whose one end is fixed to the actuating portion 161 and rotates when the actuating portion 161 rotates, a pair of sliding plates 141, And a second link 172 rotatably coupled to the first link 171 at an end corresponding to the first link 171. The second link 172 is fixed to the sliding plate 141 as the fixing protrusion 172a extending to both sides is fastened to the sliding plate 141 and is pushed by the first link 171 to move the sliding plate 141 in the forward direction As shown in Fig.

The inclination adjusting operation of the assisting plate 3 using the inclination adjusting unit 100 will be described below.

10 shows a structure in which the hook bars 121 of the latch 120 are engaged with the second hook 130a and the second hook groove 140a of the first hook holes 130a, do.

11, the user lifts the grip portion 163 of the inclination adjusting lock lever 160 to the back side of the assisting plate 3 in order to further increase the inclination of the assisting plate 3 in this state.

Accordingly, the first link 171 rotates to the right in FIG. 10 and the first and second links 171 and 172 are opened, so that the sliding member 140 advances in the direction of the arrow together with the second link 172 do. Therefore, in this state, the first and second hooking grooves 130b and 140a are displaced from each other, and the hooking bar 121 hooked to the first and second hooking grooves is inserted into the first and second hooking grooves 130b, 140a.

In this state, the user lifts the auxiliary plate 3 forward or downward to change the inclination of the auxiliary plate 3. At this time, if the auxiliary plate 3 is set up forward so that the inclination is high, When the auxiliary plate 3 is laid down rearward so that the inclination is lowered, the latch 120 is also pressed by the auxiliary plate 130 and moved in a direction to be laid down.

When the force applied to the grip portion 163 of the lock lever 160 for slope adjustment is removed, the sliding member 140 is moved backward through the restoring force of the elastic member (not shown) The second hooking grooves 140a can be aligned with the first group 130a or the third group 130c of the first hooking grooves 130a, 130b, and 130c according to the inclination change of the assisting plate 3 , The hooking rods 121 are hooked on the first and second hooking grooves which are once again brought into contact with each other so that the slope of the adjusted auxiliary plate 3 is maintained. 12, the hooking rods 121 are hooked on the second hooking grooves 140a of the first hooking grooves 130a, 130b, and 130c, which are aligned with the first group 130a, 3) is adjusted to have a larger inclination.

The knob portion 163 is positioned on the inner side of the outer side of the auxiliary plate 3 and the knob portion 163 is attached to the auxiliary plate 3 corresponding to the position of the knob portion 163 from the upper side of the auxiliary plate 3 The manipulation hole 3a can be penetrated so that it can be inserted and held.

Therefore, in the case where the inclination of the assisting plate 3 is to be varied by using the inclination adjusting unit 100, the user inserts one hand of the assisting plate 3 into the operating hole 3a from the upper portion of the assisting plate 3 163 can be grasped and operated. At this time, the user can hold the auxiliary plate 3 with the hand gripping the handle 163. When the user adjusts the inclination of the auxiliary plate 3 while holding the auxiliary plate 3 by hand, The user can hold the assisting plate 3 in a state where the shock absorber of the assisting plate 3 is not installed and the inclination adjusting operation of the assisting plate 3 can be stably performed.

The foregoing has shown and described specific embodiments. However, it should be understood that the present invention is not limited to the above-described embodiments, and various changes and modifications may be made without departing from the spirit of the technical idea described in the following claims There will be.

1: top plate 2: main plate
3: Auxiliary plate 6: Body frame
7: auxiliary frame 10: height adjustment unit
20: Cross arm 30: First link arm
40: second link arm 50: shock absorber
60: height adjusting locking device 70: first locking part
80: second latch 90: height-adjusting lock lever
100: Coupling adjustment unit 120: Clasp
130: Retaining plate 140: Sliding member
160: lock lever for adjusting the inclination 170: link member

Claims

An upper plate including a main plate and an auxiliary plate which can be positioned on the same plane; A height adjusting unit arranged to vary a height of the assisting plate to an upper portion of the main plate; And an inclination adjusting unit provided to vary the inclination of the assisting plate relative to the main plate,
A main body frame is provided at the bottom of the upper plate, an auxiliary frame is provided at the bottom of the auxiliary plate,
Wherein one end of the auxiliary plate is rotatably coupled to the auxiliary frame,
Wherein the inclination adjusting unit includes a slope adjusting lock lever having a handle for allowing or blocking the rotation of the assisting plate relative to the sub frame, the inclination adjusting lock lever being located on the back side of the assisting plate, And an operating hole penetrating the auxiliary plate corresponding to the sub-position.

The method according to claim 1,
Wherein the height adjusting unit includes at least a pair of cross arms composed of a pair of link arms rotatably crossed with each other so as to be foldably connected between the main frame and the auxiliary frame,
Wherein one of the pair of link arms constituting the cross arm is rotatably coupled to the auxiliary frame at one end of its upper end and is slidably coupled to the main frame in a horizontal direction at its other end,
The other one of the pair of link arms is rotatably coupled to the main frame at one end of the lower portion and is slidably coupled to the auxiliary frame in the horizontal direction at the other end thereof,
And the positions of both ends of the pair of link arms constituting the crossarm are arranged so as to be located on the same line along the vertical direction.

3. The method of claim 2,
A pair of link arms constituting the cross arm are connected through a shock absorber,
Wherein the shock absorber has both ends rotatably coupled to one side of an intersection of the pair of link arms at the top and bottom of the intersection,
And both ends of the shock absorber are arranged so that one end is closer to the intersection than the other end.

3. The method of claim 2,
Wherein the height adjustment unit includes a height adjustment lock lever provided to allow or block rotation between a pair of link arms constituting the cross arm,
And the height-adjusting lock lever is operated by both hands.

3. The method of claim 2,
Wherein the height adjusting unit includes a height adjusting lock device configured to allow or block rotation between a pair of link arms constituting the crossarm,
Wherein the locking device comprises a first latching part provided on any one of the pair of link arms constituting the crossarm, a second latching part provided on the auxiliary frame so as to be hooked on the first latching part, And a height-adjusting lock lever provided so as to switch between the first and second latching portions into a latching or latching state.

delete

An upper plate including a main plate and an auxiliary plate which can be positioned on the same plane; A height adjusting unit arranged to vary a height of the assisting plate to an upper portion of the main plate; And an inclination adjusting unit provided to vary the inclination of the assisting plate relative to the main plate,
A main body frame is provided at the bottom of the upper plate, an auxiliary frame is provided at the bottom of the auxiliary plate,
Wherein the auxiliary plate is rotatably coupled to the auxiliary frame,
Wherein the inclination adjusting unit includes a latch located at the bottom of the assisting plate so as to be elastically supported in a direction of increasing the inclination of the assisting plate and a hook fixed to the back of the assisting plate so as to have a plurality of first hooking grooves, And a plurality of second hooking grooves arranged in parallel at the same intervals as the plurality of first hooking grooves so that the second hooking grooves can be aligned with the first hooking grooves, And a pressing means provided to press the sliding member in a direction opposite to an elastic supporting direction of the latch.