JP3536439B2 - Electric switchgear - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric switching device for opening and closing a display such as a liquid crystal display by a driving motor. 2. Description of the Related Art A conventional electric switchgear will be described below with reference to the drawings. FIG. 2 is a front view of a conventional electric switchgear, and FIG. 6 is a side view showing the state where the device is opened to the maximum. 2 and 6, reference numeral 1 denotes a liquid crystal display;
Is a torsion coil spring provided at the lower end of the liquid crystal display 1, 3 is a shaft of the liquid crystal display 1, 4 is a bearing portion of the shaft 3, 5 is a driving gear attached to one end of the shaft 3, and 6 drives a driving gear 5. A drive motor unit, 7 is a pedestal, and 8 is an axial load unit that generates an axial load in the rotation direction of the shaft 3 of the liquid crystal display 1. The shaft 3 is held by a bearing 4 fixed to a pedestal 7. One end of the torsion coil spring 2 is fixed to the lower side surface of the liquid crystal display 1,
The other end is in contact with one bearing portion 4. FIG. 3 is an enlarged sectional view of a main part of the shaft load section 8 in FIG. In FIG. 3, 9 is a fixing washer, 1
Reference numeral 0 denotes a disc spring, and reference numeral 11 denotes a leaf spring having one end fixed to the pedestal 7. The operation of the electric switchgear configured as described above will be described below. A driving force is transmitted from a driving motor section 6 to a driving gear 5 of the liquid crystal display 1, and the liquid crystal display 1 rotates in directions indicated by arrows A and B in FIG. During rotation of the liquid crystal display 1, a torsional load of the torsion coil spring 2 acts in the direction of arrow B to cancel the weight moment generated by the weight of the liquid crystal display 1 and reduce the moment required for the rotation of the liquid crystal display. Also, during the electric rotation of the liquid crystal display 1,
Near the turning position 1a in the direction of action of the own weight of the liquid crystal display 1, the backlash in the gear train (not shown) of the drive motor unit 6 (play in the meshing of the gears and the backlash in the rotation direction of the liquid crystal display 1). A phenomenon occurs in which the rotation speed of the liquid crystal display 1 is instantaneously increased by the weight of the liquid crystal display 1 by the amount of. In order to prevent this phenomenon, an axial load is generated in the rotation direction of the shaft 3 in the shaft load unit 8 so that the phenomenon that the rotation of the liquid crystal display 1 is instantaneously accelerated is made inconspicuous. In the shaft load portion 8 shown in FIG. 3, the flange portion 3a provided on the shaft 3 is sandwiched from both sides by a plate spring 11, and is urged from both sides by a plate spring 10, and the plate spring 10 is fixed by a washer 9 for fixing. By holding, a frictional force is generated between the leaf spring 11 and the flange portion 3a, and an axial load is generated in the rotation direction of the shaft 3. FIG. 4 shows a front view of another configuration of the conventional electric switchgear. FIG. 5 is an enlarged sectional view of a main part of the shaft load unit of FIG. As shown in FIG. 5, a shaft load portion of this device is configured to urge the leaf spring 12 from above the shaft 3 by using a screw 13 so that a contact portion between the leaf spring 12 and the shaft 3 is provided. The frictional force is generated to generate a shaft load in the rotation direction of the shaft 3. [0008] However, in such a conventional electric switchgear, a space for providing a shaft load portion is required, and the device becomes large. Further, there is a problem that the number of parts such as a leaf spring and a washer constituting the shaft load part increases, which leads to an increase in cost. The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an electric switchgear capable of minimizing the space required for the structure and the number of parts. [0010] In order to solve this problem, an electric opening and closing device according to the present invention is an electric opening and closing device for opening and closing a display unit by a drive motor, and the rotation of the display unit is provided at the lower end of the display unit. A shaft provided in a direction perpendicular to the direction, a first bearing provided at one end of the shaft, a compression torsion coil spring disposed coaxially with the shaft between the first bearing and the display. A drive gear provided at the other end of the shaft, and a felt for transmitting the rotational driving force of the drive motor to the drive gear, and the display unit is attached from one side in a direction substantially parallel to the shaft by a compression load of a compression torsion coil spring. The display unit is rotated by the driving force of the driving motor by urging the driving gear against the felt. With this configuration, the axial load in the rotational direction of the shaft can be obtained only by changing the torsion coil spring to a compression torsion coil spring and adding a material that generates friction.
The space and the number of parts for configuring the shaft load section can be minimized. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of the electric switching device of the present embodiment. In FIG. 1, the same components as those in the related art are denoted by the same reference numerals, and description thereof will be omitted. Reference numeral 13 denotes a compression torsion coil spring provided on the lower side surface of the liquid crystal display and provided coaxially with the shaft 3. Reference numeral 14 denotes a felt attached to a member constituting the drive motor unit 6. The operation of the electric switchgear of the embodiment constructed as described above will be described. The liquid crystal display 1 is urged in a direction indicated by an arrow C substantially parallel to the shaft 3 by the compression load of the compression torsion coil spring 13, and
Is pressed against the felt 14, a frictional force is generated between the end face of the drive gear 5 and the felt 14, and an axial load in the rotation direction of the shaft 3 is obtained. In this embodiment, in order to further stabilize the axial load of the shaft 3 in the rotation direction, the surface of the drive gear 5 on the side of the felt 14 is subjected to a grinding process. Further, during the rotation of the liquid crystal display 1, a torsional load of the compression torsion coil spring 13 acts in a direction to open the liquid crystal display 1,
The weight moment generated by the weight of the liquid crystal display 1 is canceled, and the moment required for the rotation of the liquid crystal display is reduced. As described above, the compression torsion coil spring 13
, The liquid crystal display 1 is urged from one side in a direction substantially parallel to the rotation axis 3 of the liquid crystal display 1 by a compressive load and pressed against the felt, thereby generating an axial load in the rotation direction of the rotation axis, and the electric opening and closing In addition to alleviating the backlash in the rotation direction of the liquid crystal display 1 inside, the torsional load acts on the liquid crystal display 1 in the opening direction, and the moment required for the rotation of the liquid crystal display 1 can be reduced. In this embodiment, a felt is used to obtain an axial load in the rotation direction of the rotating shaft, but a material that generates another frictional force may be used instead of the felt. As described above, the present invention uses a compression torsion coil spring to urge the liquid crystal display from one side in a direction substantially parallel to the rotation axis of the liquid crystal display and to press the felt against the felt by a compressive load. At the same time, the liquid crystal display is biased in the opening direction by the torsional load. , And the space and the number of parts for configuring the shaft load section can be minimized.
This has an excellent effect that the cost can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an electric switchgear according to an embodiment of the present invention. FIG. 2 is a front view of a conventional electric switchgear. FIG. FIG. 4 is a front view of a conventional electric switchgear. FIG. 5 is an enlarged sectional view of a main part of a shaft load portion in the conventional electric switchgear. FIG. 6 is a side view of the electric switchgear. 3 Shaft 4 Bearing unit 5 Drive gear 6 Drive motor unit 13 Compression torsion coil spring 14 Felt

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-165785 (JP, A) JP-A-4-4309 (JP, A) JP-A-62-256613 (JP, A) 35214 (JP, U) Hira 4-26577 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G09F 9/00 312

Claims (1)

(57) An electric opening / closing device for opening and closing a display unit by a drive motor, comprising: a shaft provided at a lower end of the display unit in a direction perpendicular to a rotation direction of the display unit. A first bearing provided at one end of the shaft, a compression torsion coil spring disposed coaxially with the shaft between the first bearing and the display, and provided at the other end of the shaft. And a felt that transmits the rotational driving force of the drive motor to the drive gear, and urges the display unit from one side in a direction substantially parallel to the axis by a compression load of the compression torsion coil spring. An electric opening / closing device, wherein the driving gear is pressed against the felt so as to rotate the display unit by the rotational driving force of the driving motor.