JP2008114537A - Elevatable blackboard apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elevatable blackboard apparatus which can keep the weight reduced as much as possible, and the manufacturing and construction costs as well, requires no braking operation, and is easy of the elevating operation. <P>SOLUTION: This elevatable blackboard apparatus is constituted in such a manner that a blackboard 1 is hung and held while resisting the gravity by balance springs 20a, 20b and 20c which are attached to a fixing-holding frame 4 for elevatably holding the blackboard 1. At the same time, a geared cable 15 which keeps a steel wire 15b spirally wound around a core wire 15a by a specified pitch is stretched along the elevating path on the blackboard 1 side. A gear element 25 which engages with the geared cable 15 is installed on the fixing-holding frame 4 side, and the engaged geared cable 15 is vertically moved by the rotation-driving of the gear element 25. Thus, the blackboard 1 which is integrated with the geared cable 15 is elevated through the geared cable 15. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an ascending / descending blackboard apparatus that automatically raises and lowers a blackboard (including a white board and a bulletin board) electrically.

  As a conventional electric elevating blackboard device, for example, as described in Patent Document 1, a rotating shaft extending in the horizontal direction is mounted on a fixed holding frame that holds the blackboard so as to be movable up and down via a bearing. There is a motor in which a rotary shaft driving motor is installed, a plurality of winding drums are disposed on the rotating shaft, and a power transmission winding belt is interposed between the winding drum and the blackboard.

In addition, as a conventional ascending / descending blackboard apparatus, the blackboard is suspended and held against the gravity by a balance spring attached to a fixed frame body that holds the blackboard so that it can be moved up and down, and this blackboard can be arbitrarily moved up and down by mechanical equilibrium. The vertical movement is restricted by the manual brake device at the stop position, and the blackboard can be moved up and down lightly while maintaining mechanical equilibrium at an arbitrary position by the release operation of the brake device, for example, It is described in Patent Document 2.
Japanese Patent No. 3515929 JP-A-11-137362

  In the ascending / descending blackboard apparatus described in Patent Document 1, a long rotating shaft and a large number of bearings for supporting the rotating shaft are provided, and a large motor is required. There is a problem that the construction is difficult and the construction cost is high. Moreover, in the raising / lowering blackboard apparatus of patent document 2, since the raising / lowering operation and brake operation of a blackboard are performed manually, for people with weak hand powers such as women and children, short people, people using wheelchairs, etc. There existed a problem that those operations became difficult.

  In view of the above problems, the present invention can reduce the weight of the device as much as possible, can reduce the production and construction cost as much as possible, and does not require a brake operation, and can be easily and easily operated. An object is to provide a device.

  Means for solving the above problems will be described with reference numerals of the embodiments described later. The lifting blackboard apparatus of the invention according to claim 1 is attached to a fixed holding frame 4 that holds the blackboard 1 to be movable up and down. The balance springs 20a, 20b and 20c are used to suspend and hold the blackboard 1 against its gravity, and a flexible geared cable 15 formed by spirally winding a steel wire 15b around the core wire 15a is provided on the blackboard. A gear body 25 that is stretched along the lifting path on one side and meshed with the geared cable 15 and a motor 40 that rotationally drives the gear body 25 are provided on the fixed holding frame 4 side. The geared cable 15 to be engaged is moved up and down, and the blackboard 1 integrated therewith is moved up and down via the geared cable 15. .

  Claim 2 is the lifting blackboard apparatus according to claim 1, wherein flocking M formed by adhering a fibrous resin to the groove G formed by the spirally wound steel wire 15 b of the geared cable 15 is interposed. It is characterized by.

  The effect of the invention by the above solution will be described with reference numerals in the embodiments described later. The lifting blackboard apparatus of the invention according to claim 1 is configured such that the blackboard 1 is brought into gravity of the blackboard 1 by the balance springs 20a to 20c. The geared cable 15 is stretched along the ascending / descending path on the blackboard 1 side, and the gear body 25 that meshes with the geared cable 15 and the motor 40 that rotationally drives the geared cable 15 are configured. Provided on the fixed holding frame 4 side, the gear body 25 is rotationally driven by the motor 40 to move the gear cable 15 meshed with the gear body 25 up and down, and the blackboard 1 integrated therewith via the guard cable 15. The blackboard 1 can be stopped at any position up and down by mechanical balance by the urging force of the balance springs 20a to 20c. Therefore, the driving force for raising and lowering the blackboard 1 may be relatively small. Therefore, a small and lightweight motor 40 can be used, and a long rotating shaft and many bearings are unnecessary as in the conventional device. As a result, the weight of the apparatus can be greatly reduced, and the manufacturing and construction costs can be reduced as much as possible.

  Further, since the blackboard 1 is normally locked in a non-rotating state by the meshing relationship between the geared cable 15 and the gear body 25 and is fixed at an arbitrary stop position in a braked state, a brake device is not required. Therefore, the lifting and lowering operation can be performed only by operating the switch for starting and stopping the motor, and it can be easily performed by a person with weak hand power such as a woman or a child, a short person, or a person using a wheelchair. .

  Further, the gear body 25 and the motor 40 are provided on the fixed holding frame 4 side, and the gear body 25 is rotationally driven by the motor 40 to move the geared cable 15 up and down, thereby moving the blackboard 1 up and down. Since an extra structure (gear body 25, motor 40, etc.) is not provided on the blackboard 1 on the surface side of the blackboard device, the weight on the blackboard 1 side can be reduced and the raising / lowering operation can be performed smoothly.

  And especially in the raising / lowering blackboard apparatus of this invention, the geared cable 15 was employ | adopted as a raising / lowering drive means to raise / lower the blackboard 1, and this geared cable 15 itself spirally wound the steel wire 15b around the core wire 15a. Since the geared cable 15 attenuates and absorbs vibration generated when the blackboard 1 held by the fixed holding frame 4 moves up and down, it prevents the generation of annoying abnormal noise such as noise caused by the vibration. can do. In addition, by adopting this flexible geared cable 15, when the geared cable 15 is stretched along the lifting path of the blackboard 1, the mounting accuracy such as the vertical degree of the geared cable 15 is somewhat rough. The smooth raising / lowering operation of the blackboard 1 is not affected, and therefore the assembling / lowering driving means can be easily assembled. Further, the use of the geared cable 15 makes it possible to reduce the size of the elevating drive means and reduce the size of the driving means, and to greatly reduce the manufacturing cost.

  Incidentally, it is conceivable to use a rack and pinion as means for driving the blackboard 1 up and down, and to provide a rack gear vertically on the blackboard side and a pinion and a motor meshing with the rack gear on the fixed holding frame side. In the lift drive system using a pinion, the weight of the rack gear itself is heavy, and the weight of the device increases. In addition, such a rack and pinion cannot absorb the vibration generated when the blackboard moves up and down. It is extremely unsuitable as a driving mechanism for raising and lowering blackboards because it causes extra vibrations due to rattling when it engages with the unit, causing annoying abnormal noise such as noise and worsening the work environment. .

  According to the second aspect of the present invention, the rotational drive is achieved by interposing the flock M formed by adhering the fibrous resin to the groove G formed by the spirally wound steel wire 15b of the geared cable 15. The noise generated when the gear body 25 is engaged with the geared cable 15 to move the geared cable 15 up and down can be eliminated or reduced.

  A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which the blackboard 1 is removed with the upper frame 2 and the lower frame 3 shown in the side view of FIG. FIG. 2 is a front view showing the internal structure of the fixed holding frame 4. Lifting guide columns 5 and 6 are attached to both ends of the upper and lower blackboard frames 2 and 3, and both guide columns 5 and 6 are provided on the fixed holding frame 4. By passing through the guide holes 7, the blackboard 1 is held by the fixed holding frame 4 and can be raised and lowered.

  A rotating shaft 8 orthogonal to the surface of the blackboard 1 is supported at the center of the fixed holding frame 4 so as to be able to rotate forward and backward by a bearing (not shown). And the cam body 10 are fixed so as to be integrally rotatable and sequentially shifted in the axial direction. One end portions 11a and 12a of the pair of blackboard cords 11 and 12 are fixed to the outer peripheral surface of the disc 9 at the point-symmetrical positions, and the one end portions 11a and 12a side is the outer peripheral surface of the disc 9. Are wound around in the same direction. The other ends 11b and 12b of the blackboard cords 11 and 12 are extended downward via guide pulleys 13 and 14 that are pivotally supported near the left and right ends of the fixed holding frame 4, respectively. 3 is fixed. Therefore, if the disc 9 rotates counterclockwise as shown by the arrow in FIG. 1, the cords 11 and 12 are pulled out downward, and the blackboard 1 attached to the blackboard lower frames 2 and 3 has its own weight. Will descend.

  Further, one end 16a of the cam body cord 16 is fixed to the outer periphery of the cam body 10, and the one end 16a side is wound in a direction opposite to the blackboard cord bodies 11 and 12. The other end 16b is connected to the spring mounting plate 18 via a guide pulley 17 provided at the right end of the fixed holding frame 4.

  A plurality of (three in the illustrated example) balance springs 20a are provided between the spring mounting plate 18 to which the end 16b of the cam body cord 16 is connected and the other spring mounting plate 19 opposed thereto. , 20b, 20c are mounted in parallel to the respective mounting seats 21a, 21b, 21c. Then, one end of the frame cord 22 is fixed to the other spring mounting plate 19, and the other end of the cord 22 is connected to the lower end 4 a of the blackboard holding frame 4 via the guide pulley 23. Has been.

  The rotational torque of the cam body 10 due to the urging force of the balance springs 20a to 20c, which is sequentially increased by the disk 9 that rotates as the blackboard 1 is lowered, is the rotational torque of the disk 9 due to the weight of the blackboard 1. The cam surface of the cam body 10 is formed so as to be successively smaller in the radial direction so as to always coincide with each other, whereby the blackboard 1 is suspended and held by the urging force of the balance springs 20a to 20c against the gravity. It is in a state where it can stop at any position up and down after obtaining a mechanical equilibrium.

  That is, a plurality of, in the drawing, three balance springs attached to the mounting seats 21a to 21c across the spring mounting plate 18 on the cam body cable body 16 side and the spring mounting plate 19 on the frame body cable body 22 side. The total urging force of 20a to 20c is adjusted to the urging force that obtains a mechanical balance with the weight of the blackboard 1.

  The blackboard 1 is suspended against the gravity of the blackboard 1 by the balance springs 20a to 20c as described above, and on the blackboard 1 side as shown in FIG. The cable 15 is disposed in a tension state, and a gear body 25 (see FIG. 4) that meshes with the geared cable 15 is provided on the fixed holding frame 4 side, and the gear body 25 is driven to rotate for a predetermined stroke. It is driven up and down.

  The geared cable 15 is a flexible cable in which a steel wire 15b is spirally wound around a core wire 15a at a constant pitch, as shown in an enlarged view of FIG. ), A plurality of, for example, three metal wire rods 15ao are formed by twisted wires. As shown in FIGS. 1 and 3, the upper and lower ends a and b of the geared cable 15 are integrally fixed to the upper blackboard frame 2 and the lower blackboard frame 3 by cable fixing brackets 24, respectively.

  The gear body 25 that meshes with the geared cable 15 is a helical gear (exact illustration is omitted). As shown in FIGS. 3 to 5, the geared cable driving unit provided in the fixed holding frame 4. As can be seen from FIG. 5A, the geared cable 15 is placed on the opposite side of the gear body 25 on the side facing the gear body 25 with the geared cable 15 interposed therebetween. A backup plate (supporting plate) 38 supported from the inside is provided in the case main body 27. Further, as shown in FIG. 5A, the gear case 43 attached to the case main body 27 is supported by a rotating shaft 39 to which the gear body 25 is fixed, and the driving worm gear 41 is supported on the rotating shaft 39. The worm gear 41 is engaged with a drive worm 42 that is directly connected to the motor 40. The motor 40 is installed at a constant inclination angle with respect to the case body 27 as shown in FIG. 4A, and the driving worm 42 is coaxially provided at the tip of the driving shaft 40a of the motor 40. ing.

  Therefore, the rotating shaft 39 rotates forward and backward through the drive worm 42 and the worm gear 41 by forward and reverse rotation of the motor 40, and the gear body 25 is driven forward and backward by forward and reverse rotation of the rotating shaft 39. The geared cable 15 is moved up and down by the forward and reverse rotation of the gear body 25, and the blackboard 1 integrated with the geared cable 15 is moved up and down.

  Further, the geared cable 15 is locked in a non-rotating state at all times, that is, when the motor 40 is stopped, so that the geared cable 15 is locked in a non-rotating state, and the vertical movement of the geared cable 15 is restricted. It is regulated. Thus, by starting the motor 40 from this state, the gear body 25 is driven, the geared cable 15 meshed with the gear body 25 can be moved up and down, and the blackboard 1 can be moved up and down.

  3 and 4A, the case body 27 of the geared cable drive unit assembly 26 is provided with a blackboard lower limit limit switch 28 and a switch lever 28a at the upper end thereof. A blackboard upper limit switch 29 and a switch lever 29a are provided at the lower end. As shown in FIGS. 1 and 3, the geared cable 15 has a lower limit limit dog 28b on the upper end a side and a lower end. The upper movement limit dogs 29b are respectively attached to the part b side.

  As shown in FIG. 4B, each of the dogs 28b and 29b is composed of a female screw body screwed into the geared cable 15, and the female screw bodies 28b and 29b are rotated on the geared cable 15 so as to be in the required positions. By tightening the lock screw 44, the position can be set easily and easily.

  Therefore, when the geared cable 15 is moved downward from the neutral position as shown in FIGS. 1 and 3, the lower movement limit dog 28b is connected to the lower limit limit switch 28 on the blackboard at the upper end of the geared cable drive assembly 26. When the switch lever 28a is kicked, the operation of the motor 40 is stopped by the detection signal, and the blackboard 1 stops at the lower limit position of the lifting stroke. When the geared cable 15 moves up from the neutral position, the upper movement limit dog 29b kicks the switch lever 29a of the blackboard lower movement limit switch 29 at the lower end of the geared cable drive section assembly 26 (FIG. b), the motor 40 is stopped by the detection signal, and the blackboard 1 is stopped at the upper limit position.

  Further, as shown in FIG. 5 (b), a thin fibrous resin is adhered to the geared cable 15 with a strong adhesive in a groove G formed by the core wire 15a and the spirally wound steel wire 15b. The formed flock (pile) M is interposed, and noise such as a metal sound generated when the gear body 25 that is rotationally driven meshes with the geared cable 15 to move the geared cable 15 up and down is eliminated or eliminated. It has been reduced. As the flock M, for example, an adhesive formed by blending a thin fibrous resin made of material 6 nylon, thickness 20 denier, length 1.8 mm, color tone gray and ethylene-vinyl acetate copolymer aqueous emulsion with a solvent. In this way, it is formed by strongly adhering to the groove G. Thus, by interposing the flocked hair M in the groove G, it is difficult to come off and a silencing effect is effectively exhibited.

  In FIG. 3, 30 is a power supply box, 32 is a power cord, 33 is an operation switch of the blackboard 1, and although not shown, it has a button for raising and a button for lowering. Reference numeral 34 denotes a wiring cord that connects the power box 30 and the motor 40 of the geared cable drive unit assembly 26 to the operation switch 33. Reference numeral 35 denotes a cord tension spring that is pulled so that the wiring cord 34 does not loosen.

  In FIG. 2, the blackboard 1 is attached to the fixed holding frame 4 attached to the wall surface W by the mounting brackets 36 and 36 through the lifting guide posts 5 and 6 and the blackboard upper and lower frames 2 and 3 attached to the upper and lower ends thereof. The state is shown schematically. In FIG. 2, reference numeral 37 indicates the powder collection of the blackboard 1. The blackboard 1 shown in FIGS. 1 and 2 has, for example, a length of 3600 mm, a height of 1200 mm, a weight of, for example, 43 kg, and a lifting stroke of, for example, 600 mm.

  Next, the operation of the elevating blackboard apparatus configured as described above will be described.

  The blackboard 1 is held in a state where the blackboard 1 can be stopped at any upper and lower positions by mechanical balance due to the biasing force of the balance springs 20a to 20c attached to the fixed holding frame 4, and is normally locked in a non-rotating state. In the state where the brake is applied by the gear body 25, the geared cable 15 is prevented from moving up and down and is fixed at an arbitrary stop position as shown in FIG.

  If, for example, the ascending button of the operation switch 33 is pressed from the state shown in FIG. 1, the motor 40 of the geared cable drive unit assembly 26 rotates in the forward direction, for example, while the button is kept pressed. When the body 25 is driven to rotate, the geared cable 15 is moved up to raise the blackboard 1 and release the button, the rotation of the motor 40 stops and the blackboard 1 stops at its raised position. Further, while the button is kept pressed, the upper movement limit dog 29b on the lower end b side of the geared cable 15 moves the switch lever 29a of the blackboard upper limit limit switch 29 on the lower end side of the geared cable drive assembly 26. When kicking, the motor 40 stops and the blackboard 1 stops at the upper limit position of the stroke.

  When the lowering button of the operation switch 33 is pressed, the motor 40 of the geared cable driving unit assembly 26 rotates reversely while the button is kept pressed, and the gear body 25 is driven to rotate in the reverse direction to lower the geared cable 15. When the blackboard 1 is moved down and the button is released, the motor 40 stops and the blackboard 1 stops at its lowered position. Further, while the button is kept pressed, the lower movement limit dog 28b on the upper end a side of the geared cable 15 pushes the switch lever 28a of the blackboard lower movement limit limit switch 28 on the upper end side of the geared cable drive assembly 26. When kicking, the motor 40 stops and the blackboard 1 stops at the lower limit position of the stroke.

  According to the elevating blackboard apparatus as described above, the blackboard 1 is suspended and held against the gravity by the balance springs 20a, 20b, and 20c attached to the fixed holding frame 4 that holds the blackboard 1 so as to be movable up and down. In addition, the geared cable 15 is stretched on the blackboard 1 side along the ascending / descending path, the gear body 25 meshing with the geared cable 15 is provided on the fixed holding frame 4 side, and the gear body 25 is rotationally driven. The motor 40 is also provided on the fixed holding frame 4 side, and the gear body 25 is rotationally driven by the motor 40 and the geared cable 15 is moved up and down to move the blackboard 1 up and down. The blackboard 1 is raised and lowered because the balance springs 20a to 20c are held in a state where the balance springs 20a to 20c can be stopped at any arbitrary position by mechanical equilibrium. The driving force can be relatively small. Therefore, a small and lightweight motor 40 can be used, and a long rotating shaft and many bearings are not required as in the conventional device, which reduces the weight of the device as much as possible. At the same time, manufacturing and construction costs can be reduced as much as possible.

  Further, the blackboard 1 is normally prevented from rotating up and down by the gear body 25 locked in a non-rotating state so that the geared cable 15 is prevented from rotating in the braked state, and is moved to an arbitrary stop position. Because it is fixed, the brake device is not required, so lifting and lowering operations can be performed simply by pressing the button of the operation switch 33. People with weak hands, such as women and children, short people, people using wheelchairs, etc. But it can be done easily.

  In addition, the gear body 25 and the motor 40 are provided on the fixed holding frame 4 side, and the blackboard 1 is moved up and down by rotating the gear body 25 by the motor 40 and moving the geared cable 15 up and down. Since no extra structures such as the gear body 25 and the motor 40 are provided on the blackboard 1 on the surface side of the blackboard device, the weight on the blackboard 1 side can be reduced and the raising / lowering operation can be performed smoothly.

  The lifting blackboard apparatus according to the present invention has a great feature in that a geared cable 15 is used as a lifting driving means for moving the blackboard 1 up and down. The geared cable 15 itself has a steel wire 15b around a core wire 15a. Since the cable is a flexible cable formed by spiral winding, the geared cable 15 attenuates and absorbs vibration generated when the blackboard 1 held by the fixed holding frame 4 moves up and down, and noise such as noise caused by the vibration is disturbed. Generation of abnormal noise can be prevented. In addition, by adopting this flexible geared cable 15, when the geared cable 15 is stretched along the lifting path of the blackboard 1, the mounting accuracy such as the vertical degree of the geared cable 15 is somewhat rough. The smooth raising / lowering operation of the blackboard 1 is not affected, and therefore the assembling / lowering driving means can be easily assembled. Furthermore, by employing the geared cable 15, the structure of the lifting drive means can be reduced in size and size, and the manufacturing cost can be greatly reduced.

  The lifting blackboard device is a conventional type of ready-made device, that is, the blackboard is stopped at an arbitrary vertical position by a mechanical balance via a balance spring, and is moved up and down by a manual brake device at the stop position. By providing the geared cable drive assembly 26 including the geared cable 15 in place of the brake device of the manually operated lifting blackboard apparatus, the automatic lifting blackboard apparatus can be provided at a low cost as well as the existing manual lifting blackboard apparatus. The automatic brake blackboard apparatus can be easily improved by removing the manual brake device from the vehicle and attaching the geared cable drive assembly 26 including the geared cable 15 as shown in FIGS.

It is a front view which mainly removes the blackboard in the state which left the upper frame and lower frame of the blackboard shown in the side view of FIG. 2, and mainly shows the internal structure of a fixed holding frame. It is a side view same as the above. FIG. 2 is a partially enlarged view of FIG. 1. (a) is a front view which shows a geared cable drive part assembly, (b) is an expanded sectional view of the dog for lower movement limits and the dog for lower movement limits. (a) is an enlarged view of a geared cable, a gear body, a back-up plate and related parts, (b) is an enlarged view of a part of the geared cable, and (c) is a sectional view taken along line XX of (b).

Explanation of symbols

1 Blackboard 4 Fixed Holding Frame 15 Geared Cable 15a Core Wire 15b Steel Wire 18 Spring Mounting Plate 19 Spring Mounting Plate 20a Balance Spring 20b Balance Spring 20c Balance Spring 25 Gear Body 26 Geared Cable Drive Assembly 40 Motor M Flocking

Claims (2)

  A flexible geared with a steel spring spirally wound around the core wire, with a balance spring attached to a fixed holding frame that holds the blackboard up and down so that the blackboard is suspended and held against gravity. A cable is stretched on the blackboard side along its ascending / descending path, and a gear body that meshes with the geared cable and a motor that rotates the gear are provided on the fixed holding frame side, and the geared that meshes with the gear by rotating the gear body. An ascending / descending blackboard apparatus characterized in that a cable is moved up and down, and an integrated blackboard is moved up and down via the geared cable.   The lifting blackboard apparatus according to claim 1, wherein flocking is formed by adhering a fibrous resin to a groove formed by a spirally wound steel wire of a geared cable.

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