KR101396112B1 - Device that can automatic move upward and downward blackboard - Google Patents

Abstract

The present invention can solve physical pain because the height of a blackboard or a bulletin board for writing used in a place of education is freely adjustable depending on the height of an educator and thus the educator does not have to bend over or stand on tiptoe, and can also reduce the eye position of the educator and increase feelings of intimacy between the educator and students by allowing the blackboard to freely move up and down so that the written blackboard can be also seen from the farther back, and by not using a platform, a symbol for authoritarianism. Consequently, the present invention can greatly improve quality of education. A conventional manual type lifting device was simply uncomfortable to use. Also, a conventional automatic type lifting device was invented in a winch type using a wire or by vertically installing a screw, but the automatic type lifting device could not be commercialized due to a lot of problems in terms of practicality. However, the present invention provides an electric device for lifting a blackboard vertically, in which a driving part uses the principle of a lever adopting a four-bar linkage mechanism or a two-bar scissors mechanism, and remaining parts other than the driving part are made into a single unit and thus are configured to be easily coupled, thereby facilitating mass production and having on-the-spot installation become easy, quick, convenient. The blackboard is vertically lifted by easily and quickly moving an entire heavy frame of the blackboard within a certain height range with low power and high efficiency because elasticity of a spring reinforces power.

Description

[0001] The present invention relates to a device for automatically moving up and down a blackboard,

The present invention uses an educational blackboard or a bulletin board so that an educator can freely raise, lower, and write a book, and can automatically raise and lower the entire height of the entire frame of the blackboard as much as desired.

The present invention automatically eliminates the physical difficulties in the writing board by automatically controlling the desired height so that the chalkboard or the board does not bend or brace according to the height of the educator, However, all of the conventional technology drivers required high power, and it was not commercialized because of the complicated manufacturing process as well as the generation of a lot of noise.

10-2009-0096533, JP 1996-048284, 1995-004404. 2013-0016909.

The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide a blackboard lifting apparatus and a blackboard lifting apparatus according to the present invention, So that the desired height can not be adjusted easily. Therefore, the existing technology products are installed even though they are installed, and the automatic up / down products according to the existing technology are not operated due to excessive noise due to driving. In order to solve this problem, the present invention aims at easily raising and lowering the entire frame of a practical blackboard, and it has a high efficiency power structure so that the energy can be reduced, so that the cause of noise is minimized , Easy to manufacture and less than As shown in FIG.

In addition, it is necessary to install the blackboard because the wall surface of the blackboard has not been plastered as it is piled up, The safety system should be able to solve this problem because the board can fall due to the weight of the board when the board is tilted due to a breakdown or obstacle when the board is down. .

In the present invention, the driving part of the ascending and descending power is a 4-section link or a 2-section link aka 2-section scissor, which utilizes the lever principle, and all parts except the driving part are made into one unit, It is easy to assemble both products with bolts. The four-bar link is composed of 4 upper and lower link arms and 6 upper and lower link arms, And the 2nd section scissors is a basic structure in which the left and right rotating nuts, the slider bushing and the screw shaft (2) and the upper slide bar are connected to the 2-section link arm and then vertically installed and connected by 5 hinges. Type All The vertical and horizontal slide bars are installed parallel to the link arm and fix the chalkboard frame to the top and bottom joints of both boards.

The blackboard raising and lowering apparatus of the present invention includes a plurality of link arms (33, 34, 65) hinged to each other; A rotation shaft (35, 36, 66) screwed to at least one link arm of the plurality of link arms (33, 34, 65) to move up and down the at least one link arm; And a motor (40) for driving the rotary shaft. The upper and lower slide rods (5) mounted on the link arms (33, 34) and the upper and lower slide rods (5) Upper and lower link arm supports 31 and 32 connected to upper and lower portions of the link arms 4 and 33 and upper and lower slide rods 5 and 6, (35, 36) are provided at the centers of the link arms (4, 33, 34), and the upper and lower linking fixtures The lower link arm supports 31 and 32 can vertically ascend and descend in accordance with the operation of the rotation shafts 35 and 36 and the link arms 34 and 33. [ ) Is composed of four quadruple link arms, and anchor supporting plates (1,2,3,4) are installed between the upper and lower binding fixtures (6, 7) Arm support ( 31 may be combined with the board upper joining fixture 6. The center shaft 36 integrally formed with the screw shaft 35 and the motor 40, the speed reducer 41, 42 and 43 which together define a motor spring hanger 43 and a motor shaft 44. The motor shaft 40 is connected to the motor shaft 40 by means of a motor The joining body 42 is integrally formed by welding with the bushing 37 and secures the proof strength enough to withstand the motor portions 4, 40, 41, 42, 43 and the motor portion 4 and the center shaft 36 A cushion of a cushion is formed on the bushing 37 in a straight line so that a mounting gap between the mounting wall surface and the chalkboard frame 78 is reduced and a rubber pad 97 is provided in the gap, , The blackboard spring hanger 44 is provided to connect the motor part 4 and the upper board fixing fixture 6 with the motor tension spring 45 The tension spring 49 is mounted on the link arms 34 and 34 and the tension spring 49 is mounted on the mounting surfaces of the link arms 34 and 34. Therefore, The washer 52 is inserted into both sides and fastened with the bolts 50 and the nuts 51 so that the three fastening grooves of the tension spring 49 are formed at the center, left and right sides, The link arms (4) and (33) and (34) can be constructed by mounting two to six tension springs (49) according to the weight of the blackboard to reinforce the power. It can be assembled into a structure to secure mechanical stability.

The link arm (2) (65, 65) is composed of two 2-link links, and the upper and lower supports (62, 68) are hinged to the 2-link link arm (65); An upper slider rod 60 which is received in the upper support 62 and slidably moves; And the screw shaft (2) 66 is accommodated in the lower support rod 68 and rotated by the motor so that the link arms 65 and 65 move up and down the upper support rod 62 The lower support table 68 is bolted to the operation support 8 and the link arms 65 and 65 are fixed by the motor part 40, 41 and 72 and the rotation shaft 66 and 66, The upper and lower fixing fixtures 6 and 7 are fixed to the ends of the upper and lower slide bars 5 and the lower and upper fixing fixtures 6 3 and 4 are fixed to the wall, and the upper support frame 62 is coupled to the board upper coupling fixture 6 with bolts, and the upper and lower portions of the board The blackboard frame 78 may be vertically elevated and lowered by the motor 40 by engaging the blackboard frame 78 with the coupled fixtures 6 and 7, A weight weight 91 and an electrode fixing rod 96 and a connection tunnel 95 are provided on the inner upper surface of the frame 78 and an electrode A 92 and an electrode B 94 are provided on the inner upper surface of the frame 78, The electrode A 92 and the electrode B 94 are brought into contact with each other when the blackboard frame 78 is tilted when the blackboard frame 78 is lowered to stop the lowering of the blackboard frame 78 The upper and lower compression springs 75 and 77 are inserted into both ends of the upper and lower supports 62 and 68 so as to be fitted to the screw shaft 66 and the upper slider rod 60 The power can be reinforced by the compressed spring elasticity during the descent.

The present invention can easily produce a heavy whole blackboard frame in which various functions are incorporated in the blackboard, the user can safely and comfortably operate the terminal box with high efficiency of power and low noise due to operation, and the structure is simple and easy to manufacture. A large vertical force can be obtained with a small horizontal force, that is, a large operation range. The entire weight of the chalkboard frame moving up and down is supported by the link arm, and the weight of the chalkboard frame is damped and transmitted to the rotary shaft It is possible to produce a structure in which noise generation is small and a large kinematically stable force can be exerted. By using the elasticity of the tensile and compression springs, the unbalance of the lifting and lowering forces, Is supported by the spring elasticity, and is driven with a low power of high efficiency in almost the same power .

1 is a configuration diagram of an assembly completion basic unit; 2 is a front view of the four-bar linkage.
3 is a side view of a four-bar linkage. 4 shows a tension spring hook of a four-bar link.
5 is a front view of the second section scissors. 6 is a side view of the second section scissors.
7 is a four-bar link mounting and demounting strength to the unit. 8 is a cross-sectional view of the second embodiment of the present invention.
Fig. 9 is a rear view of a board attached to a four-section link; Fig. 10 is a rear view of a chalkboard mounted on a second scissors. Fig.
11 is a block diagram of a safety device. 12 is an automatic control electric wiring circuit diagram.
13 is a view showing the shape of a rubber pad. 14 is a plan view of a four-section link and a two-section scissors.

For a better understanding of the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified in various forms and should not be construed as limiting the scope of the present invention to the embodiments described in detail below. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. The detailed description of known functions and configurations that may be unnecessarily obscured by the gist of the present invention will be omitted. In order to facilitate description of the embodiments of the present invention, , And the understanding of the detailed explanation emphasized the sign rather than the term name, An upper bushing 10 which is inserted into the upper and lower single bushings 9 as a sliding part of the lower bush 5 and a lower bushing 12 which is inserted into the lower bushing as shown in Fig. (35,36) because the screw shaft (35) and the central shaft (36) are welded together and used integrally with each other, and they are named as the sliding shafts (9,10,11,12) ④ In the description of the common function of the shaft 35 and the center shaft 36 and the screw shaft ② (66), the rotational shafts (35, 36 and 66) are used and the screw shaft ② (66) And the motor 40 and the speed reducer 41 are used as a common name in the description of the quadruple link and the second shear in detail. In the quadruple link, the motor 40 The motor reducer 41, the motor combination 42 and the motor spring hanger 43 will be described together with the motor unit 40, 41, 42, And the motor bracket 72 and the motor bracket 72 are collectively referred to as a motor unit 40, 41 and 72. The upper link arm 33, the lower link arm 34, The common description names for the link arms 33, 34 and 65 and the link arms 4 and 33 and 34 and the link arms 2 and 65 are shown in FIG. 1. FIG. 1 is a cross- It is a front view and a side view. It consists of all units except the main drive unit, and the unit is assembled into one unit. The unit is combined with a 4-section link or 2-section scissors to complete two types of board up / It is easy to mass-produce, easy on-site installation, fast and convenient.

In order for the left and right stays 13, 14 to be free from deformation in the welding or operating force so that the upper and lower slider rods 5 can be stably vertically operated in the unit, the torsion and bending moment mechanically The left and right stays (13, 14) are selected by using a square pipe which is a stable structure. The left and right stays (13, 14) And the stator 15.16 are first welded to a precise height and length, and the width of the left and right stays 13 and 14 is equal to the thickness of the upper and lower portions 9 and 11, The left and right stays 13 and 14 and the upper and lower slider rods 5 are parallel to each other when the left and right stays 13 and 14 are welded while maintaining the parallelism and the upper and lower left and right fasteners 9 and 11 are welded. And the operation support 8 is supported by the left and right stays 13, 14 (1, 2, 3, 4) welded to each other in a vertical direction so as to be perpendicular to the front and rear sides, and anchor support plates (1,2,3,4) If the left and right stays 13 and 14 are held vertically without any restriction on the wall shape at the time of field installation of the unit, the anchor supporting plates 1, 2, 3 and 4 are easily bent even if there is a bend in the wall surface, (1, 2, 3, 4) of sufficient size in the left and right stays (13, 14) so that it is easy to install and easy to install.

When the upper and lower slider rods 5 are inserted into the left and right stays 13 and 14, the rod compression spring 17 is inserted into the upper portion and the stop ring 24 is inserted into the left and right stays 13 and 14, And the upper and lower slider rods 5 are fastened to the rod upper and lower brackets 18 and 20 welded to the upper and the lower coupling fixtures 6 and 7 with the rod upper and lower fixing bolts 19 and 21, The exact position of the upper and lower limit switches (22, 23) on the front surface of the left stay (13) is determined by the installation height of the unit The board compression spring (17) is used to reinforce the drive by the spring elasticity when it is lifted and lowered at both the lower and the upper positions. It is for this reason.

The four-bar linkage and the two-section scissors are used as a driving unit of the ascending and descending steel. The upper and lower slider rods 5 of the unit are vertically moved by the sliders 9, 10, 11, The link arms 33, 34, and 65 are supported by the forces acting in the front, rear, left, and right directions, so that it is smooth and sufficient to move the blackboard frame 78 up and down with the link arms 33, 2 is a front view of a four-bar link, and the present invention is not a method of bending the link arm ④ (33, 34), which is a typical manufacturing technique technique, And the four link arms are connected to form one link arm? (33, 34) operated by one quadrant and the hinge point 47 is connected to the bushing 37 And the upper and lower link arm supports 31 and 32 are linked by six hinges, and the link arms < RTI ID = 0.0 > In this case, the resistance against the twisting and the bending moment due to the operation of the light board frame 78 is more than that of the ordinary four-link linkage. In this case, (33, 34) is bent so that the link arms ④ (33, 34) are assembled in the shape of narrower width on the left and right in the longitudinal direction The structure becomes the most dynamically stable structure and the durability improves greatly.

The central axis 36 is inserted into the screw shaft (35 and the nut 38 and inserted into the screw shaft (35 by the rotation axis (35, 36 inserted in the horizontal center of the link arm (33, The bushing 37 is inserted into the bushing 37 so that the center shaft 36 is separated from the bushing 37 so that the movement stopping latch 39 is disposed at the front and rear of the bushing 37, (40, 41, 42, 43), and the link arms (4, 33, 34) are smoothly operated by this drive.

The rotation axes 35 and 36 of the link arms 34 and 34 rise up to the half height as the motor 40 in accordance with the rise of the upper link arm support 31, The motor coupling member 42 is provided so that the link arms 4 and 33 and the motor 40 can be coupled to each other in such a manner that the link arms 40 and 44 move horizontally in the same manner to sufficiently win the twisting and bending moments generated by the power generation It is very important to be connected to the center shaft 36 and the bushing 37. This is because the structure in which the motor portions 40, 41, 42, 43 are coupled to the central shaft 36 in a straight line, It is possible to reduce the space between the wall surface and the chalkboard frame 78 so that the chalkboard frame 78 is installed near the wall so that the bushing 37 and the motor part 4 (40, 41, 42, 43) The blackboard spring hanger 44 is attached to the board upper joining fixture 6 to constitute a motor spring hanger 43 in the motor 40 so that the motor 40 The long spring 45 is hooked on the motor and chalkboard spring retainers 43 and 44 so that the adverse effect of the motor weight due to the cantilevered spring to the motor tension spring 45 is reduced but the weight of the motor part 4 (40,41,42,43) It is very important to locate the motor and the blackboard spring hanger 43 and 44 so that the tension of the motor tension spring 45 can be uniformly maintained. Therefore, the proper position is selected by spacing a certain distance toward the speed reducer 41 It is possible to select the length in which the tension of the motor tension spring 45 is kept substantially constant even if the position of the link arm ④ (33, 34) is changed by operation, but since it is stronger in the positionally narrowed state, The spring (45) distance is set slightly longer so that the tension can be almost the same at any location,

Fig. 3 is a side elevational view of a four-bar link. Fig. 4 is a representation of a tension spring hanger 48 of a four-bar link. In order to compensate for the large power required for descent, A tension spring 49 is mounted on the link arm ④ (33, 34) to reinforce the driving force by the elasticity of the tension spring 49, and the tension spring hanger 48 is configured in the link arm to mount the tension spring 49 The washer 52 having the same size as the link arm width is inserted into the link arm ④ (33, 34) on the mounting surface by tightly fitting the link arm steel piece on both sides and fastened with the bolt 50 nut 51, The link arms 4 and 33 are free from stress and the groove of the tension spring 49 is formed in the tensile spring hanger 48 and the bolt 50 and the nut 51 to form three central left and right sides, And two to six tension springs (49) can be mounted depending on the weight of the board, Can actively cope with weight.

Fig. 5 is a frontal notation of the second section scissors, Fig. 6 is a side notation of the second section scissors, and the second section scissors is a screw shaft in the lower part of the link arm② (65,65) And the hinge pin 74 of the two-bar link arm 65 is rotated from the slider bushing 70 and the left and right rotation nuts 69 to the rotation shaft 2 (66, 66) The upper slider rod 60 slides and the upper support 62 supports the upper slider bushing 70. The lower link arm 65 and the lower link arm 65 The left and right rotation nuts 69 in the pivot shafts 66 and 66 support the link arms 65 and 65 and have a rotation support housing 63 and a bushing 64 at the center, The upper and lower supports 62 and 68 are fixed to the first and second slider bushings 70 and 69 of the two cores supporting the force without precision machining, (66,66) inside the both ends of the second upper and lower supporting members (62,68) and the upper portion (65,66) fitted to the upper slider rod (60) The two-step scissor motor 40 is directly fixed to the wall. Therefore, the vibration pad 73 is inserted under the motor bracket 72, Minimize vibration.
FIGS. 7 and 8 show front views of the states in which the lifting and lowering of the driving units are completed. FIGS. 9 and 10 show a rear elevation device mounted on a board, 78 and the unit and the safety devices 91, 92, 94 can be easily understood and understood.
FIG. 11 is a safety device that applies the principle of the balance, and when the board is large and heavy, the product is connected in parallel. When the width of the board is wide, the lift is stopped when a trouble occurs. (93) and the electrode fixing rods (96) are free from warping, and the chucking jib (93) and the electrode fixing rods (96) are free from deflection. 93 and the weight 91 are hinged so as to conform to the principle of the applied balance and one end of the chucking rod 93 and the electrode fixing rod 96 are fixedly engaged with the upper inner surface of the chalkboard frame 78, An electrode A 92 is connected to the weight 91 connected to the weight 91 and a connection tunnel 95 and an electrode B 94 is formed in the connection tunnel 95. The wiring box on the relay, The weight 91 is made heavy so that there is no malfunction in the vibration or shaking, and both the electrode A 92 and the electrode B 94 are not connected to the wobbles of the front, rear, left, and right sides, The electrodes of the connection tunnel 95 and the weight 91 are formed only on the upper and lower sides so that the weight 91 is connected to the upward and downward movement by the hinge and when the weight 91 is inclined according to the principle of the balance, In this case, since the upper limit switch 22 line is live, the board is lifted slightly to remove the cause, and then the weight of the weight limiter If the tilt is restored to its original position, it can be lowered again.
12 is a wiring diagram of the board up / down apparatus, which uses the upper and lower limit switches 22 and 23 and the stop ring 24 to automatically control the blackboard frame 78, and the other motor 40 and the condenser And manual toggle, pushbutton switch and relay, and display lamp and terminal box. One line of single-phase AC220V from the power terminal is connected to the motor (40) with two wires to the terminal box. To turn on the lamp only, connect the upper and lower limit switches (22, 23) to the common terminal COM in the toggle and push button switch and the upper and lower limit switches (22, 23) to the left stay (13) And the lower limit switches 22 and 23 use a normally connected NC terminal, and the wire for the left and right rotation of the motor is connected to the capacitor one by one so that the change of the motor left and right rotation is controlled by the upper and lower limit switches 22 and 23 , The top ring 24 is provided on the upper and lower slider rods 5 to operate the upper and lower limit switches 22 and 23 at the maximum upper and lower positions of the link arms 33 and 34 and 65. When the operation switches are operated, Since the switches 22 and 23 are normally connected to the NC, electric power is supplied to the motor to supply power to the left and right rotary wiring of the motor 40 by the capacitor, and the blackboard frame 78 is rotated When the stop ring 24 is moved up or down, when the upper and lower limit switches 22 and 23 are pushed, electricity is cut off and then stopped. When the operation switch is reversed, the other upper and lower limit switches 22 and 23 are reversely operated The first upper and lower limit switches (22, 23) are released and remain in the NC state, which is activated whenever electricity is supplied. If the first operation is desired after the operation is stopped, repeat the above operation. The toggle is neutral and the push button is held in place when the push button is touched. The upper and lower limit switches 22 and 23 are automatically stopped at the maximum rising and falling, The button switch is operated by pressing and holding, and stops when the hand is released.
Fig. 13 is a diagram showing the configuration of the blackboard frame 78 and the rubber pad 97 as a safety device to be installed in the wall space. A gap between the blackboard frame 78 and the wall above the blackboard frame 78 is used as a space for accommodating the flag frames, However, since the sides and bottom of the board frame 78 can be held by hand, a rubber pad 97 of a rubber or silicone material is installed on the wall side of the board frame 78 in a space where the wall fits in case of a safety accident. The shape of the rubber pad 97 can sufficiently receive the force. Even if it touches the wall, the thickness of the blackboard is thicker than that of the wall surface so that no noise is generated. It is made with thin structure.
Fig. 14 is a top plan view from above, showing the combination of the unit, the four-bar link and the two-lever scissors drive unit, and the utility of the anchor support plates (1,2,3,4) The notation of the structure is complex and is represented by a thin line.
The core of the present invention is summarized in three points. First, in order to make the convenience and simplicity of production and field installation, all the components except the two main driving sections of the four-section link or two-section scissors are divided into a single basic unit The simple coupling of the driving part to the unit is achieved by coupling the lower coupling hole 54 in the lower link arm support 32 to the lower coupling hole 26 formed in the operation support 8 of the unit, The upper half of the upper link arm support 31 is fastened to the unit upper engagement hole 25 formed in the board upper engagement fastener 6 by fastening the 2 nd lower fastening hole 67 in the upper link arm supporting bracket 68 with bolts, A second method is to fasten any driving part to the unit by fastening bolts to the hole 53 or the second relief hole 61 in the upper supporting part 62. Secondly, With a small force, you get a large vertical force Since the entire weight of the chalkboard frame 78 to be lifted and lowered is supported by the link arms 33, 34, 65 and the rotary shafts 35, 36, And it can be operated with a small power according to the weight of the board. Third, the lowering can be operated with a small power according to the weight of the blackboard. However, in order to reinforce the unbalance requiring a large amount of power, the rod compression spring 17 is inserted into the upper and lower slider rods 5 of the unit, And the lower compression springs 75 and 77 are installed in parallel to reinforce the power by the elasticity thereof so that the spring elasticity of each drive device can be made equal to the entire weight of the board, It can be completed with high efficiency at a low power the board elevating unit that can be operated with power.

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The chalkboard automatic lifting and lowering apparatus of the present invention can be used in schools, academies, private education institutes, and other public and private educational institutions, and can be used in various industries such as blackboards and board boards. Technology can be used.

1: Upper anchor support plate 2: Upper anchor support plate 3: Upper anchor support plate
4: Howa anchor plate 5; Upper and lower slider bars 6: Blackboard upper joining fixture
7; Chalkboard lower coupling fixture 8: Operation support 9:
10: Upper bushing 11: Lower underside 12: Lower bushing
13: Left stays 14: Usesties 15: Top stays and stagnation
16; Lower stance and stagnation 17: rod compression spring 18; Bar upper bracket
19: rod top fixing bolt 20: seal bottom bracket 21; Seal bolt
22: upper limit switch 23: lower limit switch 24: stop ring
25: unit upper coupling hole 26: unit lower coupling hole
31: upper link arm support 32: lower link arm support 33: upper link arm
34: Lower link arm 35: Screw shaft ④ 36: Center shaft
37: Bushing 38: Nut 39; Moving stop brace
40: motor 41: speed reducer 42: motor coupling
43: motor spring hanger 44: blackboard spring hanger 45: motor tension spring
46: parallel link 47: hinge point 48; Tension spring hook
49; Tension spring 50: bolt 51: nut
52: washer 53: 4 reamer coupling hole 54: 4 lower coupling hole
60: upper slide rod 61: double lift-up coupling hole 62: upper support
63; Rotation support housing 64: Bushing 65: Double link link arm
66; Screw Row ② ② 67; 2 Lower coupling hole 68: Lower support
69: right and left turning nut 70: slider bushing 71:
72: motor bracket 73; Anti-vibration pad 74; Hinge pin
75; Upper compression spring 76: fixing bolt 77: lower compression spring
78: chalkboard frame 91: weight weight 92: electrode A
93: plug jib 94: electrode B 95: connection tunnel
96: electrode fixing rod 97: rubber pad 1, 2, 3, 4: anchor supporting plate
9, 10, 11, 12: Sliding device 33, 34: Link arm ④ 33, 34, 65:
65, 65: Link arm 2 35, 36: Rotary shaft 4, 35, 36, 66:
66,66: Rotary shaft ② 40,41,42,43: Motor part ④ 40,41,72: Motor part ②

Claims (10)

A board up / down apparatus capable of raising and lowering a board board frame (78), comprising: a plurality of link arms (33, 34, 65) hinged to each other; A rotation shaft (35, 36, 66) screwed to at least one link arm of the plurality of link arms (33, 34, 65) to move up and down the at least one link arm; And a motor (40) for driving the rotating shaft. The method according to claim 1,
Upper and lower slide bars 5 mounted on the link arms 4 and 33 ; Sliding devices (9, 10, 11, 12) supporting the upper and lower slide rods (5) so as to move up and down only ; Upper and lower link arm supports (31, 32) connected to upper and lower portions of the link arms (4, 33, 34); And upper and lower board fixing bodies (6, 7) fixed to both ends of the upper and lower slide bars (5)
The rotation shafts 35 and 36 are provided at the centers of the link arms 34 and 34 and the upper and lower link arm supports 31 and 32 are supported by the rotation shaft 4 and the link arm 4, Wherein the upper and lower board fixing fixtures (6, 7) vertically ascend and descend. 3. The method of claim 2,
The link arms 4 and 33 are formed by four-link links. The lower link arm support 32 is bolted to the operation support 8, And the upper link arm support 31 is coupled to the board upper joining fixture 6 by bolts, and the upper and lower support arms 31, Wherein the blackboard frame (78) is vertically raised and lowered by the motor (40) by engaging the blackboard frame (78) with the lower joining fixtures (6, 7). The method of claim 3,
(35, 36) and a motor (4) (40, 41, 42, 43); A motor coupling body 42 at the center shaft end which is a part of the rotation shaft 4 is integrally formed by welding with the bushing 37; The motor unit 4 and the rotation axis 4 are cantilevered to the bushing 37 in a straight line so that the installation clearance between the wall surface and the board frame 78 is reduced, A rubber pad 97 is provided in the gap and a blackboard spring hanger 44 is provided on the board upper joining fixture 6 so that the motor tension spring 45 ; (4) and the upper board fixing fixture (6) to compensate for adverse effects due to the cantilever construction. 5. The method of claim 4,
A tension spring (48) is provided on the link arm (4) (33, 34), and a tension spring (49); The bolts 50 and the nuts 51 are inserted into both sides of the washer 52 on the mounting surfaces of the link arms 4 and 33, respectively. And two tensile springs are mounted on the right and left sides of the tension spring 49 to increase the strength of the tension spring 49 according to the rigidity of the tension spring and the weight of the board. Chalkboard automatic ascending and descending device. 6. The method of claim 5,
The link arm (4) (33, 34) is assembled in a narrow shape with a wide width in the right and left in the longitudinal direction, and mechanically stable. The method according to claim 1,
The link arm (2) (65, 65) is composed of a two-link link and includes upper and lower supports (62, 68) hinged to the link arm (2); And a slider bushing 70 and an upper slider rod 60 which are accommodated in the upper supporter 62 and slid on the upper supporter 62. The rotation shafts 66 and 66 and the left and right rotary nuts 69 support the lower supporter 68 And the link arm (2) vertically raises and lowers the upper support table (62) when the motor (40) is rotated and supported by the rotary support housing (63) and the bushing Lifting device. 8. The method of claim 7,
The lower support table 68 is bolted to the operation support table 8 and the upper support table 62 is moved up and down by the operation of the link arm 2 (65, 65) And upper and lower board fixing fixtures (6, 7) are fixed to the ends of the upper and lower slide bars (5); Anchoring plates (1, 2, 3, 4) are installed between the upper and lower binding fixtures 6 and 7 to fix the upper support plate 62 to the blackboard upper joining fixture 6) and bolts, and the blackboard frame (78) is engaged with the upper and lower board fixing fixtures (6, 7), so that the boardboard frame (78) vertically ascends and descends by the motor part Chalkboard automatic ascending and descending device. The method according to claim 4 or 8,
A chute bar 93 and an electrode fixing bar 96 are fixed to an upper inner surface of the chalkboard frame 78 and a weighing bar 91 and a connection tunnel 95 are connected to each other. 91 are hinged to each other, and the electrode A (92) and the electrode B (94) ; The electrode A 92 and the electrode B 94 are brought into contact with each other when the blackboard frame 78 is inclined when the blackboard frame 78 is lowered to stop the descent of the boardboard frame 78 by the operation of the safety device relay Automatic board up and down device that features blackboard. 9. The method of claim 8,
Upper and lower compression springs (75, 77) fitted to the rotating shafts (66, 66) and the upper slider rod (60); And is inserted in both ends of the upper and lower supports (62, 68), and is reinforced by spring elasticity that is compressed when the lid is lifted and lowered.

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