JPH04210174A - Device for opening and closing gate - Google Patents

Abstract

PURPOSE:To obtain an easy-to-handle device for opening and closing a gate which is capable of automatically changing gears by selectively driving first and second input gears via a cross operating plate which is axially moved in a direction corresponding to that of rotation of a handle shaft. CONSTITUTION:To close a gate, a handle shaft 23 is rotated in the direction in which to close the gate and then a cross operating plate 33 held stationary between discs 29,30 by a spring 41 is axially moved backward by rotation of a screw portion 34 and is pressed into contact with the disc 30 via a frictional plate 32 and then a second input gear 37 is rotated and this rotation in the direction indicated by the black arrow is transmitted to an output shaft 26 via a second output gear 38. To open the gate, the handle shaft 23 is rotated in the direction in which to open the gate and then the cross operating plate 33 is axially moved forward by rotation of the screw portion 34 and is pressed into contact with the disc 29 via a frictional plate 31 and then a first input gear 35 is rotated and this rotation in the direction indicated by the white arrow is transmitted to the output shaft 26 via a first gear 36.

Description

[Detailed description of the invention]

[00011

[Industrial Field of Application] The present invention relates to a gate opening/closing device used in sewage treatment facilities or the like to open/close a gate by operating a handle. [0002] [0002] A conventional device of this kind has a handle shaft and an output shaft, as shown in Japanese Patent Publication No. 59-49373, in order to change the handle operating force when opening and closing the gate. Alternatively, a pair of ascending gear and descending gear that have different gear ratios and do not mesh directly are fixed to the intermediate shaft, and the ascending intermediate gear and descending intermediate gear are attached to a bracket swingably provided on the handle shaft. A device is known in which the intermediate gear for ascending and the intermediate gear for descending are selectively engaged with the ascending gear and the descending gear in accordance with the rotation direction of the handle. There is. In addition, as shown in Japanese Utility Model Application Publication No. 60-61576, two sets of gears are provided on each of the handle shaft and the output shaft, so that the gear on one shaft can be slid, and this can be controlled by a switching lever between the fixed shaft and the output shaft. There are also known devices in which the selected gear is selected. [0003]

[Problems to be Solved by the Invention] Of the above conventional examples, the former has a structure in which a bracket provided on the handle shaft is swung depending on the direction of handle operation to switch gears and engage them. I feel uneasy about the occlusion. [0004] Furthermore, the latter type has the disadvantage of poor operability since the gear cannot be changed without operating the switching lever. SUMMARY OF THE INVENTION The present invention has been made to solve these problems, and it is an object of the present invention to provide a gate opening/closing device that has a simple configuration, is capable of automatically changing gears, and is easy to use. [0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a handle shaft and an output shaft that are arranged parallel to each other and supported on the case side, and a predetermined interval between the inner end of the handle shaft. A pair of front and rear discs are placed opposite each other and are screwed together with a threaded portion located between the two discs and formed at the inner end of the handle shaft to rotate the handle shaft in the gate opening direction and rotate the gate. a switching gear that selectively presses against the disk by pivoting in a direction corresponding to the rotation in the closing direction;
a mechanism for preventing rotation of the switching plate with respect to the handle shaft; and a first input gear on the handle shaft side that is integrated with the one disk and meshes with the first output gear on the output shaft side. and a second input gear on the handle shaft side that is integrated with the other disk and meshes with the second output gear on the output shaft side. [0006]

[Operation] In such a configuration, when the handle shaft is rotationally driven in the gate closing direction, the switching actuation plate pivots rearward due to the rotation of the threaded portion and comes into pressure contact with the other disk.
The input gear rotates, and rotation based on the gear ratio with the second output gear meshing with the input gear is transmitted to the output shaft. Also,
When the handle shaft is rotationally driven in the gate opening direction, the switching operation plate pivots forward due to the reverse rotation of the threaded portion and comes into pressure contact with one of the discs, so the first input gear rotates and meshes with it. Rotation based on the gear ratio with the second output gear is transmitted to the output shaft. [0007]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway side view showing a gate opening/closing device according to an embodiment of the present invention. [0008] In the figure, 1 is a main body of the apparatus, and a valve rod 2 connected to a valve (not shown) is held so as to be movable up and down. 3 is a handle for opening and closing the valve. A first bevel gear 6 is mounted on a ball bearing 7 in a gear case 5 fixed on a stand 4 in the apparatus main body 1.
．． The bevel gear 6 is rotatably supported via a bolt 8 or the like, and a screw block 9 that is screwed onto the valve stem 2 is fixed to the bevel gear 6 with a bolt 10 or the like. 11 is a second bevel gear that is supported by a pole bearing 12 in the gear case 5 and meshes with the first bevel gear 6;
A lifting drive mechanism 13 is configured together with the screw block 9, the first bevel gear 6, and the like. [0009] The cylindrical protrusion 5A formed on the gear case 5 corresponding to the second bevel gear 11 has a transmission 14 interposed between the handle 3 and the lifting drive mechanism 13.
The rear part of the case 15 is attached with bolts 16 or the like. [00101 The configuration of the transmission 14 is shown second. Figure 2
In this case, the case 15 includes a main body 21, a front cover 22, etc., and a handle shaft 23 serves as an input shaft with bearings 24, 25.
It is rotatably supported by etc. 26 is an output shaft disposed parallel to the handle shaft 23 and supported by the case 15 via bearings 27, 28, etc.;
A bevel gear 11 is attached. [0011] A pair of front and rear disks 29.30 are fixedly attached to the inner end of the handle shaft 23 at a predetermined interval, and an annular friction plate is provided on each opposing surface of these two disks 29.30. 31 and 32 are attached respectively. Reference numeral 33 denotes a switching operation plate disposed between the two discs 29 and 30, which is screwed into a threaded portion 34 formed on the handle shaft 23, and when the handle shaft 23 is rotated in the gate opening direction. (in the direction of the white arrow), pivots forward (in the direction of the arrow) and presses against one of the disks 29 via the friction plate 29, and rotates the handle shaft 23 in the gate closing direction (in the direction of the black arrow)
As a result, it is configured to pivot rearward (in the direction of arrow a) and come into pressure contact with the other disk 30 via the friction plate 32. [0012] 35 is the boss portion 2 of the one disk 29
9a is the first input gear fixed to the output shaft 2.
The first output gear 36 for deceleration is fixed to the inner end of the gear 6. A second input gear 37 is fixed to the boss portion 30a of the other disk 30, and meshes with a second output gear 38 fixed to the inner end of the output shaft 26. [0013] Reference numeral 39 denotes a rotation prevention mechanism for the switching operation plate 33 relative to the handle shaft 23, and includes springs 41 accommodated in a plurality of recesses 40 formed at equal intervals in the circumferential direction on the side surface of the switching gear 33; A backup ring 43 is provided which presses the friction plate 32 by receiving the spring force of the spring 41 via a spring retainer 42, and prevents the switching operation plate 33 from rotating together with the rotation of the handle shaft 23. It is held stationary between the disks 29 and 30 as shown in FIG. [0014] Next, the operation of the above configuration will be explained. (1) When closing the gate: If the handle 3 is operated and the handle shaft 23 is rotated in the gate closing direction (black arrow direction), the switch is held stationary between the discs 29 and 30 by the spring force of the spring 41. The actuating plate 33 pivots rearward (in the direction of arrow a) by the rotation of the threaded portion 34, and comes into pressure contact with the disk 30 via the friction plate 32. Therefore, a rotational force is applied to this disk 30, the second input gear 37 rotates, and the output shaft 26 is transmitted in the direction of the black arrow through the second output gear 38 meshing with the input gear 37. Rotation is transmitted. [0015] The rotation of the output shaft 26 in the direction of the black arrow, which is performed based on the gear ratio of the second input gear 37 and the second output gear 38, causes the first bevel gear 6 to rotate through the second bevel gear 11. Since the valve is driven, the valve is driven downward via the valve stem 2, and the gate is closed. [0016] (2) When opening the gate: When the handle 3 is operated to rotate the handle shaft 23 in the gate opening direction (white arrow direction), the switching operation plate 33 is moved forward (arrow) by the rotation of the threaded portion 34. direction), and comes into pressure contact with the disk 29 via the friction plate 31. Therefore, this disk 2
9 is applied with rotational force, the first input gear 35 rotates, and the first output gear 36 meshing with this input gear 35 rotates.
Rotation in the direction of the white arrow is transmitted to the output shaft 26 via. [0017] Due to the rotation of the output shaft 26 in the direction of the white arrow based on the gear ratio between the first input gear 35 and the first output gear 36, the first
Since the bevel gear 6 is driven, the valve is driven upward via the valve stem 2, and the gate is opened. [0018] In this way, the switching operation plate 33 is axially moved according to the rotational direction of the handle shaft 23, and the first input gear 35 and the second input gear 37 are selectively driven, so that the output shaft is automatically operated. This results in rotation at a gear ratio determined by the user, improving operability, and furthermore, the axial movement of the switching operation plate 33 makes the gear switching operation more accurate. [0019]

Effects of the Invention As described above, according to the present invention, the first input gear and the second input gear are selectively driven via the switching plate that moves axially in accordance with the rotational direction of the handle shaft. With this simple configuration, it is possible to automatically switch to different gear ratios depending on the direction of rotation, and it also enables more accurate switching operation than conventional gears that change gears by swinging a bracket. Become.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing a gate opening/closing device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a transmission in the gate opening/closing device.

[Explanation of symbols]

15 Case 23 Handle axis 26 Output shaft 29.30 Disc 33 Switching actuator 35 First input gear 36 First output gear 37 Second input gear 38 Second output gear 39 Rotation stop mechanism.

[Figure 1]

Claims (1)

[Claims] 1. A handle shaft and an output shaft arranged parallel to each other and supported on a case side; a pair of front and rear discs arranged opposite to each other at a predetermined interval at an inner end of the handle shaft; a switching actuation plate located between the disks and screwed onto a threaded portion formed at the inner end of the handle shaft to selectively press against rotation of the handle shaft in the gate opening direction and gate closing direction; , a mechanism for preventing rotation of the switching plate with respect to the handle shaft; and a first input on the handle shaft side that is integrated with the one disk and meshes with the first output gear on the output shaft side. A gate opening/closing device comprising: a gear; and a second input gear on the handle shaft side that is integrated with the other disk and meshes with the second output gear on the output shaft side.