KR101596010B1

KR101596010B1 - Book support and desk for reading room

Info

Publication number: KR101596010B1
Application number: KR1020150136482A
Authority: KR
Inventors: 김현성
Original assignee: 주식회사 이스마트
Priority date: 2015-09-25
Filing date: 2015-09-25
Publication date: 2016-02-19

Abstract

The slope adjusting plate is detachably coupled to the front surface of the desk so that the slope adjusting plate can be coupled to the front surface of the slope adjusting plate in a state where the slope adjusting plate is kept at a predetermined angle. A book stand and a reading room desk using the same are disclosed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a book stand,

The present invention relates to a bookstore and a reading room desk having the bookstore. More particularly, the present invention relates to a bookstore and a bookstore desk having the same, The present invention relates to a book pedestal which can be used for supporting a book and is separated from an inclined adjustment top plate in a state where a slope adjustment top plate is horizontal, and a desk for a reading room using the same.

When you sit at a desk and read or study, you place your book on a horizontal desk top and you bow your head. Then, when you look at the book, your neck is bent. When you read or study for a long time in an early posture, the neck is painful, resulting in a neck disc.

Recently, various kinds of desks for freely adjusting the angle of the upper plate have been developed. For example, Korean Patent Registration No. 10-0571593 discloses a method of adjusting the angle of a desk top plate using a top plate lifting device having a cylinder structure And a removable pedestal is coupled to the through hole to support the book.

However, the above-described technology has a drawback in that it has a poor appearance because a through hole is formed in a desk top plate for combining a book stand, and a ballpoint pen or the like is missing due to an opened hole.

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the above problems, and it is an object of the present invention to provide a desk top adjusting apparatus, a desk top adjusting apparatus, The book holder can be used for other purposes by separating from the slope adjustment top plate in a state where the slope adjustment top plate can be used without affecting the appearance of the desk, and a desk for a reading room having the same.

The above object of the present invention is achieved by the above-mentioned object of the present invention, which comprises a connecting bar for connecting the rear surface of a bookbinding bar and the rear surface of a supporting bar so that an insertion groove is formed between the bookbinding bar, the supporting bar, A slope adjustment upper plate is fitted to the insertion groove such that the bottom surface of the slope adjustment upper plate is in close contact with the inner surface of the support bar and the front surface of the slope adjustment top plate is in close contact with the inner surface of the support bar The present invention can be achieved by providing a book cradle which is characterized by comprising:

Another object of the present invention is to provide an inclined adjusting upper plate between two side plates connected by a thick plate, wherein a mounting box is provided on a part of an upper surface of the inclined adjusting upper plate and an installation space opened upward in a lower portion of the inclined adjusting upper plate The inclined adjusting top plate is installed on the mounting box, and the inclined adjusting top plate and the mounting box are rotatably connected to each other by a hinge so that the inclined adjusting top plate is inclined rearward with respect to the hinge And an inclination adjuster is provided in the installation space of the installation box to connect the rear of the bottom surface of the inclined adjustment top plate and the rear of the bottom surface of the installation space. When the user holds the handle, The slope adjusting upper plate is inclined by the engagement structure of the slope adjusting device so as to maintain the inclined state, A desk main body configured to be parallel to the desk top while automatically lowering the slope adjusting top plate when the engagement structure of the adjuster is released; And a book support configured to connect the rear surface of the booklet bar and the rear surface of the support bar so that an insertion groove is formed between the booklet bar and the support bar, A slope adjustment upper plate is fitted to the insertion groove such that the bottom surface of the slope adjustment upper plate is in close contact with the inner surface of the support bar and the front surface of the slope adjustment top plate is in close contact with the inner surface of the support bar And a reading room desk having a reading room.

The book support according to the present invention is used to support the book by being coupled to the front surface of the inclined adjustment top plate in a state where the inclination adjustment top plate of the desk is kept at a certain angle. When the inclination adjustment top plate is horizontal, It can be used for other purposes, so that it is easy to use without affecting the appearance of the desk.

In addition, the reading room desks according to the present invention can provide the user with the best reading conditions by allowing the inclination adjusting top plate to be inclined and adjustable freely by the inclination adjuster, and the installation structure of the inclination adjusting top plate can be easily implemented, Adjustment The angle of the top plate can be adjusted. Since there is no failure rate, it is easy to maintain and the unit price is reduced.

1 is a perspective view of a book pedestal according to the present invention,
FIG. 2 is a sectional view showing the use of the book holder according to the present invention,
3 is a perspective view of a reading room desk according to the present invention,
4 is a side cross-sectional view showing the installed state of the inclination adjusting upper plate in the present invention,
FIG. 5 is a side view showing only the inclination adjuster in FIG. 4,
Figure 6 is an exploded perspective view of Figure 5,
7 is a side sectional view for explaining a rising operation state for adjusting the angle of the inclination adjusting top plate according to the present invention,
FIGS. 8 and 9 are side cross-sectional views illustrating the lowering operation state of the inclination adjusting top plate according to the present invention.

Hereinafter, a book pedestal according to the present invention and a reading room desk having the same will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a book cradle according to the present invention, and FIG. 2 is a use sectional view of a book caddy according to the present invention.

The book pedestal 10 according to the present invention comprises a pile 11, a supporting bar 12, and a connecting bar 13.

More specifically, the booklet bar 11 is formed in a bar shape having a predetermined length, and preferably a ballpoint receiving groove 11-1 is formed in the longitudinal direction, and a ballpoint pen hole 11-2 is formed on the upper and lower sides And a long hole 11-3 is formed on the other side in the vertical direction.

The support bar 12 is spaced a predetermined distance from the billet bar 11 and is formed to have the same length as the billet bar.

The connection bar 13 is formed to connect the rear surface of the billet bar 11 and the rear surface of the support bar 12 so that an insertion groove 14 is formed between the billet bar 11 and the support bar 12.

Here, the billet bar 11, the supporting bar 12, and the connecting bar 13 may be integrally formed, or they may be formed of different materials and coupled to each other. However, as described above, the bookbinding bar 11 is formed of wood so as to facilitate processing because the ballpoint receiving groove 11-1, the ballpoint pen hole 11-2, and the memo pad have the long holes 11-3, The supporting bar 12 and the connecting bar 13 are preferably made of aluminum to have a predetermined elasticity.

The width of the insertion groove 14 is substantially the same as the thickness of the inclination adjusting top plate 100 so that the inclination adjusting top plate 100 is slightly tightly inserted when inserted into the insertion groove 14, In particular, in the case where the support bar 12 is made of an aluminum material having elasticity, the support bar 12 to be inserted into the insertion groove is slightly inserted while being inserted into the insertion groove, It is preferable to press the inclined adjusting top plate inserted into the insertion groove by the elastic restoring force of the bar 12 so that the supporting bar firmly supports the inclined adjusting top plate.

Meanwhile, as shown in FIG. 2, the book cradle configured as described above is coupled to a desk having an inclination adjustment, so that the book can be supported to facilitate reading or studying.

That is, the upper surface of the inclination adjusting upper plate 100 of the desk is in close contact with the inner surface of the billet 11, the lower surface of the inclination adjusting upper plate 100 is in close contact with the inner surface of the supporting bar 12, The bookholder 10 is coupled to the inclination adjusting top plate 100 by inserting the inclination adjusting plate 100 into the insertion groove 14 so that the front surface of the bookholder 100 is in close contact with the inner surface of the connecting bar 13. Therefore, when the book is viewed on the inclined upper plate 10 with the inclination formed thereon, when the book is placed on the inclined adjustment top plate so that the bottom of the book is supported by the booklet bar of the book support, the book can be read in a comfortable state since the book is inclined.

In addition, since the book support is unnecessary when the inclination adjustment upper plate 100 is leveled, the book support can be separated from the inclination adjustment upper plate and used for other purposes. That is, a ballpoint pen is placed in the ballpoint pen-mounting groove 11-1 of the book pedestal, a ballpoint pen or the like is inserted into the ballpoint pen hole 11-2 and the memo ball is inserted into the slot 11-3, Can be used as another function.

The magnet M may be fixed to the front surface of the inclined upper plate 100 and the inner surface of the connecting bar 13 at corresponding positions. That is, when the slant adjusting upper plate 100 is inserted into the insertion groove 14 of the book holder and is engaged, when the insertion groove 14 is opened for a long period of time, the book holder is unintentionally separated from the slant adjusting upper plate . Therefore, by inserting and fixing the magnets M on the front surface of the inclined upper plate 100 and the inner surface of the connecting bar 13, the engaging force between the magnets M can secure the binding force between the book pedestal and the inclined upper plate .

Reference numeral 15 denotes a support pin for supporting the front side of the book, and reference numeral 16 denotes a slip stopper for preventing slip.

The book holder according to the present invention having the above-described structure is used to support the book by being coupled to the front surface of the inclination adjustment top plate in a state where the inclination adjustment top plate of the desk is kept at a certain angle. When the inclination adjustment top plate is horizontal, So that it is easy to use without affecting the appearance of the desk.

Hereinafter, a reading room desk having the above-described book support will be described.

3 to 7, a reading room desk according to the present invention is provided with a slope adjusting top plate 100 between both side plates 102 connected by a thick plate 104. The inclination adjusting top plate 100 is configured to be freely inclined and adjustable according to the physical condition of the user as shown by a virtual line so that the user can read in a desired posture.

A handle 110 is provided on a part of an upper surface of the inclined adjustment upper plate 100 and an installation box 200 having an installation space 210 opened upward in a lower portion of the inclined upper plate 100 is mounted on the upper plate 100 And is fixedly installed. Therefore, the inclination adjusting top plate 100 is installed on the installation box 200. The front end of the inclination adjusting upper plate 100 and the installation box 200 are rotatably connected by the hinge 120 so that the inclined upper plate 100 is lifted rearward with respect to the hinge 120, Respectively.

A slope adjuster 300 is installed in the installation space 210 of the installation box 200 to connect between the rear of the bottom surface 102 of the inclined adjustment top plate 100 and the rear of the bottom surface 212 of the installation space 210 do. Therefore, when the user lifts the rear side of the inclination adjusting upper plate 100 by holding the handle 110, the inclination adjusting plate 300 is inclined by the engagement structure of the inclination adjuster 300 so that the inclination adjusting upper plate 100 is inclined, 300 is released, the inclination adjusting upper plate 100 is automatically lowered.

The inclination adjuster 300 according to the present invention includes a lower support 310, an upper support 330, an inclined support 350, and a catching member 360.

The lower support table 310 has a structure in which the side portions 311 vertically disposed on both sides are connected to the bottom by the bottom portion 312 and a space is formed therein and the rear end portion is connected to the bottom surface of the installation space 210 A plurality of latching grooves 313 are formed in the bottom portion 312 so as to be continuously and repeatedly spaced apart from each other along the longitudinal direction and a protruding protrusion 314 is formed at the tip of the bottom portion 312, Are formed so as to protrude upward.

Here, the latching groove 313 is formed by pushing the bottom part 312 downward from the upper surface, and the protruding step 314 is formed by pushing the bottom part 312 upward in the lower surface. At this time, the shape of the latching groove 313 is formed such that the end surface of the bottom portion 352 of the tilting supporter 350, which will be described later, It is preferable to be formed so as to be inclined so as to be able to ride on and off. And the protruding jaw 314 may be formed so that the rear surface thereof is inclined so that the end of the bottom portion 352 of the oblique supporter 350 rides upright.

The rear end of the lower support 310 is fixed to the rear end of the installation space 210 by a floor fixture 320 so that the rear end of the lower support 310 can be rotatably installed behind the bottom surface 212 of the installation space 210. [ And is connected to the rear side of the bottom surface 212. A coupling pin 315 is formed on an outer surface of both side portions 311 of the lower support 310 and a coupling hole 321 is formed on the bottom of the bottom fixing hole 320 to form a coupling pin 315 And the bottom fixing member 320 is fixed to the rear of the bottom surface 212 of the installation space 210 by screws.

The upper support part 330 has a structure in which upper parts of the side parts 331 vertically disposed on both sides are connected to each other by a top part 332 so that a space is formed therein, And the rear end portion is assembled to be rotatable about the rotation center pin 333 and the rear end portion is rotatably installed behind the bottom surface of the inclination adjusting top plate 100. [

The rotation center pin 333 is assembled with a pin hole PH corresponding to the lower end of the lower support 310 and the upper end of the upper support 330, (333).

The rear end of the upper support member 330 is fixed to the inclined upper plate 100 by the upper plate fixture 340 so that the rear end of the upper support member 330 can be rotatably installed behind the bottom surface 101 of the inclined adjustment upper plate 100. [ And is connected to the rear of the bottom surface 101 of the main body. An assembly hole 334 is formed in the outer surface of both side portions 331 of the upper support member 330 and an assembly protrusion 341 is formed in the upper plate fixture 340 to be coupled to the assembly hole 334, A top plate fixture 340 is rotatably coupled to the center of the bottom plate 102 and the top plate fixture 340 is fixed to the bottom of the bottom plate 102 of the inclination adjusting plate 100 by screws. Here, the assembling protrusion 341 is formed by bending a part of the upper plate fastener 340.

The inclined support 350 has a structure in which a side portion 351 vertically disposed on both sides is connected to the bottom by a bottom portion 352 and a space is formed in the bottom portion 352. The lower support 310 and the upper support 330, respectively. That is, the upper end of the inclined support 350 is rotatably connected to the middle portion of the upper support 330 through the inclined center pin 354, and the lower end thereof is placed on the bottom surface of the lower support 310 by its own weight, The end of the portion 352 is inserted into the engagement groove 313 of the lower support 310 or is mounted on the projecting jaw 314 so as to be mounted thereon. On the inner surfaces of the lower side portions 35 of the inclined support 350, the retaining pins 353 protrude in the space direction.

Here, the structure in which the inclined center pin 354 is assembled includes a pin hole PH corresponding to an intermediate portion of the upper supporter 330 and an upper end of the inclined supporter 350, And is rotatably assembled by an inclined center pin 354.

The engaging pin seating member 360 is movably installed along the inner space of the lower support table 310 and includes a body 361 for guiding the engaging pin 353 of the inclined support 350, And a guide moving plate 365 formed integrally on both sides of the guide plate 361 to guide the guide plate 361 along the lower support table 310.

In other words, on both sides of the body 361, a pin moving groove 362 through which the engaging pin 353 of the inclined holding plate 350 is inserted and guided is vertically opened. On the tip of the pin moving groove 362, A hooking end 363 for hooking the hooking pin 353 is formed when the lower end of the support rod 310 is moved in the tip direction and a pin 363 which is seated when the hooking pin 353 is lifted is formed at the middle portion of the pin moving groove 362, A seating end 364 is formed. When the engaging pin 353 of the inclined holding member 350 moves to the front end, the engaging pin 353 is caught by the engaging end 363 to move together with the engaging pin seating member 360, The retaining pin 353 is seated on the pin seating end 364 to keep the inclined retaining base 350 in a raised state.

An engagement protrusion 316 is formed on the inner surface of the upper end of both side portions 311 of the lower support table 310 so that the guide moving plate 365 can move along the inside of the lower support table 310. The guide moving plate 365 is fitted between the bottom 312 of the lower support 310 and the engaging jaw 316 so that the engaging pin seating member 360 moves along the inner space of the lower support 310 So that it can be stably moved without being shaken when moving.

With such a configuration, the inclination adjuster 300 lifts the rear side of the inclination adjusting top plate 100 to be inclined so that the lower support table 310 and the upper support table 330 are opened around the rotation center pin 333, The end of the bottom portion 352 of the inclined support 350 is caught by one of the engagement grooves 313 and the lower support table 310 and the upper support table 330 are kept open . Therefore, the inclination adjusting top plate 100 maintains the inclined state as shown in FIGS. When the inclination adjusting upper plate 100 is lifted to the maximum extent, the lower support table 310 and the upper support table 330 are maximally extended as shown in FIG. 8, and the end of the bottom portion 352 of the inclined support 350 protrudes from the protrusion 314, The engaging pin 353 is moved in the pin moving groove 362 above the pin seating end 364. When the inclining adjusting plate 100 is placed in this state, The engaging pin 353 moves forward and downward and is seated in the pin seating end 364 so that the end of the bottom portion 352 of the inclined support 350 is spaced apart from the bottom 312 of the lower support table 310 As shown in FIG. Thus, the inclined adjusting top plate 100 is horizontally placed on the mounting box 200 as shown by a solid line in FIG. 3, while the lower supporting table 310 and the upper supporting table 330 are folded together. Of course, when the slope adjustment upper plate 100 is lifted up again, it is installed so as to be inclined as it is raised.

The shovel 400 is installed in the installation space 210 of the installation box 200 to connect the front surface 214 of the installation space 210 and the middle portion of the bottom surface of the slope control top plate 100. That is, the shock absorber 400 is configured such that when the rod 420 is installed on the shock absorber body 410 and the rod 420 is pulled, the shock absorber 400 is slowly contracted when the pulling force is removed, The end of the rod 420 is hinged to the inside of the front surface 214 of the installation space 210 through the bracket so that the hinge H is rotatably coupled to the intermediate portion of the inclined adjustment top plate 100 via the bracket. (H) and rotatably supported. Therefore, when the slope adjusting upper plate 100 is lifted up and the slope adjusting upper plate 100 is inclined, the shaver 400 is stretched. When the slope adjusting upper plate 100 is lowered, the shaver 400 is slowly contracted, Thereby helping the regulating top plate 100 to descend slowly. It is preferable that the shock absorber 400 is installed on both sides of the inclination adjuster 300 for stable operation.

The desk of the reading room constructed as above can be freely inclinedly adjusted by the inclination adjuster so that the user can provide the best reading condition and the installation structure of the inclination adjusting board can be easily implemented, Can be adjusted, and there is an advantage that the maintenance is easy and the unit cost is reduced because there is no failure rate.

Meanwhile, the book support according to the present invention can be suitably applied to a reading room desk according to FIGS. That is, as shown in FIG. 2, by inserting the inclination adjusting top plate 100 formed with the inclination due to the operation of the inclination adjuster into the insertion groove of the book pedestal and reading the book by supporting the book on the book pedestal, ) Can be used for other purposes by separating the book base from the inclined upper plate.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Anyone who can afford it will know.

10: Bookshelf 11: Booklet Bar
12: Support bar 13: Connection bar
100: Slope adjustment top plate 200: Installation box
210: installation space 300: inclination adjuster
310: lower support 313:
314: protruding jaw 320: bottom fixture
330: upper support 340: top plate fastener
350: inclined retaining base 353: engaging pin
360: engaging pin seating member 362: pin moving groove
363: Retaining end 364: Finishing end
365: guide moving plate 400:

Claims

And a connecting bar connecting the rear surface of the billet bar and the rear surface of the support bar so that an insertion groove is formed between the billet bar and the support bar,
The upper surface of the inclined adjustment top plate of the desk is brought into close contact with the inner surface of the billet bar and the bottom surface of the inclined adjustment top plate is brought into close contact with the inner surface of the support bar and the front surface of the inclined adjustment top plate is brought into close contact with the inner surface of the connection bar, The slope adjustment upper plate is fitted and fitted,
Wherein a magnet is fixed at a position corresponding to a front surface of the inclination adjusting top plate and an inner surface of the connecting bar, respectively.

delete

The method according to claim 1,
Wherein a ball-point mounting groove is formed in the upper surface of the booklet bar in a longitudinal direction, a ball-point mounting hole is formed in one side of the booklet-mounting hole in the up-and-down direction, and a slot of the memo-

A slope adjusting upper plate is installed between the both side plates connected by a thick plate, a mounting box having a handle on a part of an upper surface of the slope adjusting upper plate and an installation space opened upward in a lower part of the slope adjusting upper plate is fixed to the upper plate The inclination adjusting upper plate is installed on the installation box, and the front end of the inclination adjusting upper plate and the installation box are connected by a hinge so as to be rotatable so that the inclination adjusting upper plate is inclined rearward with respect to the hinge, And an inclination adjuster is provided in the installation space of the installation box for connecting between the rear of the bottom surface of the inclined adjustment upper plate and the rear of the bottom surface of the installation space. When the user holds the handle and lifts the rear side of the inclined adjustment upper plate, The inclined adjustment top plate is inclined by the latching structure to maintain the inclined state, and the engagement structure of the inclination adjuster The desk when the main body is inclined with adjustable upper plate is lowered automatically configure placed parallel to the desk top plate and;
And a book pedestal configured to connect the rear side of the bookbinding bar and the rear side of the support bar so that an insertion groove is formed between the bookbinding bar, the support bar, and the bookbinding bar and the support bar,
The top surface of the inclined adjusting top plate is brought into close contact with the inner surface of the billet bar and the bottom surface of the inclined adjusting top plate is brought into close contact with the inner surface of the supporting bar and the front surface of the inclined adjusting top plate is brought into close contact with the inner surface of the supporting bar, The adjusting upper plate is fitted and fitted,
Wherein a receiving groove is formed at a position corresponding to a front surface of the inclined adjusting plate and an inner surface of the supporting bar, respectively, and a magnet is inserted and fixed in the receiving groove.

5. The method of claim 4,
Wherein a ballpoint pen mounting groove is formed in a longitudinal direction on an upper surface of the booklet bar and a ballpoint pen hole is perforated in a vertical direction on one side and a slot is formed in a vertical direction on the other side.

The apparatus of claim 4, wherein the inclination adjuster comprises:
And a bottom portion of the side portion vertically disposed on both sides is connected to the bottom by a bottom portion so that a space is formed therein. The rear end portion is rotatably installed behind the bottom surface of the installation space, A plurality of latching grooves are formed continuously and repeatedly with a protrusion protruding upwardly from the bottom of the bottom support,
The side portions vertically disposed on both sides are connected to each other by an upper surface thereof by a top surface portion so that a space is formed therein and the tip portion is connected to the lower support via the rotation center pin and assembled to rotate about the rotation center pin, An upper support rod rotatably installed at a rear side of the bottom surface of the inclination adjusting upper plate,
The upper and lower supports are inclined with respect to each other. The side portions vertically disposed on both sides of the upper and lower supports are connected to each other by a bottom portion to form a space therein. The upper portion has an inclined center pin And the lower end is placed on the bottom surface of the lower support by its own weight so that the bottom end is inserted into the engagement groove of the lower support or is mounted on the projecting jaw so that the lower end is mounted on the inner surface of the lower support, A tilting retainer protruding from the tilting cylinder,
The pin supporting member is movably installed along the inner space of the lower supporting member. The pin supporting member has guide grooves formed on both sides of the supporting member. And an engaging pin seating member formed with a pin seating end which is seated when the engaging pin is raised at an intermediate portion of the pin moving groove,
When the rear of the inclined adjusting top plate is raised and inclined, the lower supporting table and the upper supporting table are extended around the rotation center pin to support the inclined adjusting top plate, and the bottom end of the inclined supporting table is hooked by any one of the engaging grooves, The lower support and the upper support are maximally extended so that the bottom end of the inclined support is placed on the protruding jaw and at the same time the engagement pin is moved in the pin movement groove in the pin movement groove, When the slope adjusting upper plate is placed in this state, the latching pin is seated on the pin seating end so that the bottom end portion of the inclined holding table moves rearward in a state of being separated from the bottom portion of the lower supporting table, The upper and lower supports are folded in a direction in which the upper and lower supports are gathered, Reading desk characterized in that the work placed horizontally.

The method according to claim 6,
Wherein a lower end of the lower support is provided with an engagement protrusion protruding from an inner surface thereof,
The guide pins are installed on both sides of the body with reference to the body, and the guide moving plates are installed to be sandwiched between the bottom of the lower support and the jaws so that the jaw- So that it can be stably moved without shaking.
A bottom fixing member is rotatably coupled to the rear end of the lower supporting member, an engaging pin is protruded from an outer surface of both side portions of the lower supporting member, and a bottom engaging pin is coupled to the bottom fixing member, Wherein the bottom fixing member is fixed to the rear of the bottom surface of the installation space by screws,
The upper plate fixing member is rotatably coupled to the rear end of the upper supporting plate. An assembly hole is formed in an outer surface of both side portions of the upper supporting plate. The upper plate fixing member is provided with an assembly protrusion coupled to the assembly pin. Wherein the upper plate fastener is fixed to the rear of the bottom surface of the inclination adjusting upper plate by screws,
In the installation space of the installation box, a shovel is provided to connect the front surface of the installation space and the middle of the bottom surface of the inclined adjustment top plate. When the rear surface of the inclination adjustment top plate is lifted and the inclination adjustment top plate is inclined to be inclined, Wherein the slope is gradually contracted when the slope descends, so that the slope adjustment top plate can be slowly lowered.