JPH08199540A - Sluice gate lifting-lowering handle - Google Patents

Abstract

PURPOSE: To protect a torque transmission mechanism transmitting the revolving torque of a handle to a sluice gate from breaking. CONSTITUTION: A hub boss section 4 is fitted externally and fixed onto a transmission shaft 2 while having a notched section 5 in an outer circumference. The hub boss section 4 is stored rotatably in a cylindrical casing 3 fastened onto a handle body 1. A torque control mechanism A consisting of the hub boss section 4, the casing 3, a ball 7 capable of being engaged with the notched section 5 and an elastic member 8 elastically energizing the ball 7 in the inside diameter direction of the hub boss section 4 is mounted. Each ball contact angle of the left and right inclined planes of the notched section 5 is made to differ mutually.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sluice gate lifting handle.

[0002]

2. Description of the Related Art It is provided at the confluence of tributaries and drainage canals,
As a method of raising and lowering the floodgate to adjust the inflow and outflow of water, a disc-shaped handle is rotated manually, and the rotation torque is transmitted to the floodgate via a transmission shaft and a torque transmission mechanism that connects to the handle, and the floodgate is raised and lowered. The method is known. This torque transmission mechanism generally combines a plurality of gears,
It transmits power from the transmission shaft to the sluice gate, and includes a rack and pinion, and a screw shaft and nut.

[0003]

By the way, since a reduction mechanism having a large reduction ratio is incorporated in a part of the torque transmission mechanism, the manual handle operating force can be extremely light. Therefore, when the sluice gate is raised by operating the steering wheel, the torque transmission mechanism may be broken by turning the steering wheel even if the sluice gate has reached the upper limit, and further rotating torque is applied. Also, when lowering the sluice, the handle can be operated lighter than it was when it was raised due to the weight of the sluice.Therefore, there is a risk that the handle will rotate vigorously. The risk of rotating and destroying the torque transmission mechanism is higher than when rising.

Therefore, the present invention solves the above-mentioned problems and provides a sluice raising / lowering handle which can be used without damaging the torque transmission mechanism even if the handle is rotated at the upper or lower limit position of the sluice. With the goal.

[0005]

In order to achieve the above object, the sluice gate raising / lowering handle according to the present invention transmits the rotational torque of the handle body to the sluice gate via a transmission shaft and a torque transmission mechanism to raise / lower the sluice gate. A water gate lifting handle that
A hub boss that is externally fitted and fixed to the transmission shaft and that has a notch on the outer periphery is rotatably housed in a cylindrical casing, and the hub boss, the casing, and the radial direction of the casing. And a resilient member that resiliently urges the ball in the inner diameter direction of the hub boss portion, the torque control mechanism being provided in the hole. The contact angles of the balls on the left and right inclined surfaces of the cutout portion viewed from the axial direction were made different from each other.

[0006]

The ball engageable with the notch is constantly pressed by the elastic member in the inner diameter direction of the hub boss. When the ball engages with the cutout portion, the casing and the hub boss portion are connected to each other, and the casing fixed to the handle body and the hub boss portion integrally rotate to transmit the rotational torque to the transmission shaft. You can Further, when a larger rotation torque is applied to the handle main body at the upper or lower limit position of the sluice, the elastic force of the ball is released from the notch while pressing the elastic member in the compression direction by the reaction force received from the left and right inclined surfaces of the notch. . Therefore, with respect to the rotation torque of the handle main body, the torque equal to or larger than the set value is not transmitted to the hub boss portion, and the torque transmission mechanism is not destroyed.

Further, since the respective ball contact angles of the left and right inclined surfaces of the cutout portion are made different from each other, the force applied by the ball to the elastic member from each inclined surface differs depending on the rotating direction.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 1 shows a sluice gate raising / lowering handle according to the present invention. The handle main body 1 is gripped and rotated by a hand, and the rotational torque is transmitted to the sluice gate via a transmission shaft 2 and a torque transmission mechanism (not shown). It is a handle for raising and lowering the floodgate. In the present invention, the "torque transmission mechanism" is
It is composed of a combination of a gear mechanism such as a rack and pinion, a worm and a worm wheel, or a screw shaft and a nut, or a chain and a sprocket. It transmits power from the transmission shaft 2 to the sluice. Up and down the floodgate. The handle body 1 is
It is composed of a central mounting boss portion, an outer peripheral ring, and a radial arm portion connecting them.

The handle body 1 has a mounting boss portion integrally fixed to a cylindrical casing 3 with fasteners such as bolts, and the casing 3 has an axial center according to the rotation of the handle body 1. Rotate around. Further, inside the casing 3, a hub boss portion 4 that is externally fitted and fixed to the transmission shaft 2 is provided. The hub boss portion 4 and the casing 3 are
Bearings 11 and 11 are provided in the gap portion, and the bearings 11 and 11 are rotatable relative to each other.

FIG. 2 is a sectional view taken along the line CC in FIG. 1, in which a substantially V-shaped notch 5 (as viewed from the axial direction of the transmission shaft 2) is provided on the outer periphery of the hub boss 4. are doing. Further, holes 6 ... Are bored in the casing 3 in the radial direction, and balls 7 ... Are housed in the holes 6.

The balls 7 are elastically urged in the inner diameter direction of the hub boss 4 by the elastic members 8 through the washers 9. The elastic members 8 are held in a prescribed compressed state by the plugs 10 and constantly press the balls 7 in the inner diameter direction of the hub boss portion 4 so that the balls 7 can be engaged with the notches 5. .

Therefore, the hub boss portion 4, the casing portion 3, the ball 7 housed in the radial hole 6 of the casing 3 and engageable with the cutout portion 5, and the ball 7 inside diameter of the hub boss portion 4. A torque control mechanism A including an elastic member 8 that elastically urges in a direction.

Next, FIG. 3 is an enlarged view of an essential part. As described above, the ball 7 is elastically urged in the inner diameter direction of the hub boss 4 by the elastic member 8 and engages with the notch 5. To do. In addition, the left and right inclined surfaces 5 of the cutout portion 5 viewed from the axial center of the transmission shaft.
The ball contact angles θ ₁ and θ ₂ of a and 5b are made different from each other. The ball contact angles θ ₁ and θ ₂ pass through the center of the ball 7 and are perpendicular to the axis of the hole 6, that is, the direction in which the force acts on the casing 3 as shown in FIG.
In the illustrated example, it is defined as an angle of a perpendicular line drawn from the center of the ball 7 to the inclined surfaces 5 a and 5 b with respect to the arrow M direction or the M ′ direction.

When the handle main body 1 is rotated when moving up and down the sluice, the casing 3 fixed to the mounting boss portion of the handle main body 1 rotates in the arrow M or arrow M'direction. As described above, the ball 7 engages with the notch portion 5, the hub boss portion 4 rotates in conjunction with the casing 3, and the rotational torque is transmitted to the transmission shaft (fixed to the hub boss portion 4),
The sluice can be raised and lowered.

On the other hand, when the handle body 1 continues to rotate even after the water gate reaches the upper limit or the lower limit position, for example, when the casing 3 is rotated in the direction of the arrow M at the upper limit position, the ball 7 moves from the inclined surface 5a. The reaction force N is received, and the reaction force N causes the ball 7 to push the elastic member 8 in the compression direction and separate from the notch 5, as shown in FIG.

That is, the ball 7 receives the elastic force W in the inner diameter direction of the hub boss portion 4 by the elastic member 8, but the inclined surface 5
In response to the reaction force N from a, the reaction force N in the compression direction of the elastic member 8
When the component force S of the elastic force exceeds the elastic force W of the elastic member 8, the ball 7 presses the elastic member 8 and separates from the notch 5.

Similarly, when the casing 3 is rotated in the direction of the arrow M'at the lower limit position and the water gate reaches the upper limit or the lower limit position, the ball 7 receives the reaction force N ', and the reaction force N'provides the ball 7 with the reaction force N'. Presses the elastic member 8 in the compression direction and separates it from the notch 5. As described above, even when an excessive external force is applied to the handle body 1 when the sluice reaches the upper limit or the lower limit position and the hub boss portion 4 cannot rotate, the ball 7 has the cutout portion 5. The external force (rotational torque) of a predetermined value or more is separated from the hub boss 4 (transmission shaft) and is not transmitted.

By the way, the ball contact angles θ ₁ and θ ₂ of the inclined surfaces 5a and 5b of the notch 5 are made different,
The ball contact angle θ ₂ is set to be larger than the ball contact angle θ ₁ . That is, when the same rotational torque is used to rotate in the directions of arrow M and arrow M ', respectively, the inclined surface 5a,
The reaction forces N and N'received from 5b are equal, but the component force S'compressing the elastic member 8 is larger than the component force S (the larger the ball contact angle is). Therefore, when the same rotation torque is applied in each rotation direction, the casing 3
The ball 7 can be easily separated from the notch portion 5 when the is rotated in the direction of the arrow M '.

Therefore, the water gate is set to descend when the ball 7 is rotated in the direction of the arrow M'which makes contact with the inclined surface of the notch 5 by increasing the ball contact angle. That is,
When the sluice is descending, the handle body 1 is caused by the weight of the sluice.
Is easy to rotate, the speed at which the handle body 1 is rotated naturally increases, and the force applied to the transmission shaft and the torque transmission mechanism when the water gate reaches the lower limit position and stops tends to become excessive, but the handle body easily No. 1 is configured so as to be in an idling state so that an excessive rotational force that would damage the torque transmission mechanism or the like is not applied.

On the other hand, when the sluice gate is raised, a large torque is required to rotate the handle body 1 due to the weight of the sluice gate. Set the angle smaller.

Next, FIG. 5 and FIG. 6 show modified examples of the cutout portion 5. In FIG. 5, the inclined surface 5b is not flat, but is bent at approximately the center of the inclination so that the inclination angle is different. 3 and 4 as shown in FIG.
The ball 7 can be separated from the notch 5 more smoothly than the embodiment shown in FIG.

Further, in FIG. 6, the ball contact angle θ ₁ of the inclined surface 5a is set to zero so that the ball 7 is not separated from the cutout portion 5 when rotated in the direction of the arrow. Therefore, when the water gate is raised, a sufficiently large torque can be applied, and the ball 7 is disengaged from the cutout portion 5 only when the water gate is lowered with a high risk of destroying the torque transmission mechanism.

As described above, the water gate lifting handle of the present invention is
Since the ball contact angles θ ₁ and θ ₂ are made different from each other and the conditions for separating from the notch 5 of the ball 7 depending on the rotation direction can be made different, a large torque can be added when the sluice is raised,
When descending with a high risk of destroying the torque transmission mechanism,
Excessive rotational torque is not transmitted.

[0025]

Since the present invention is configured as described above, it has the following effects.

Even if the handle body 1 is further rotated when the water gate reaches the upper or lower limit position, the torque control mechanism A causes the casing 3 to rotate when the torque of the handle body 1 exceeds a predetermined value. Since the hub boss portion 4 and the hub boss portion 4 are separated from each other to interrupt the transmission of the torque equal to or more than the set value, it is possible to use the torque transmission mechanism such as a gear without breaking the conventional torque transmission mechanism.

Since the ball contact angles θ ₁ and θ ₂ of the inclined surfaces 5a and 5b of the cutout 5 are made different from each other, the idling start torque can be made different between the upper limit position and the lower limit position of the water gate. That is, the idling start torque at the lower limit position can be made smaller than the idling start torque at the upper limit position. As a result, even when the handle body 1 is suddenly rotated with excessive force when lowering the sluice, the handle body 1 may be rotated when the predetermined rotation torque is exceeded.
Since the wheel rotates idly, the shock acting on the transmission shaft 2 and the torque transmission mechanism when stopped at the lower limit position can be softened and damage can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional side view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line CC of FIG.

FIG. 3 is an enlarged sectional view of a main part.

FIG. 4 is an enlarged cross-sectional view of a main part in a detached state.

FIG. 5 is a modification of the cutout portion.

FIG. 6 is a modification of the cutout portion.

[Explanation of symbols]

1 Handle Main Body 2 Transmission Shaft 3 Casing 4 Hub Boss 5 Notch 6 Hole 7 Ball 8 Repulsive Member A Torque Control Mechanism θ ₁ Ball Contact Angle θ ₂ Ball Contact Angle

Claims (1)

[Claims] 1. A transmission shaft 2 for transmitting a rotating torque of a handle body 1.
And a sluice lifting handle for transmitting and ascending / descending the sluice by transmitting it to a sluice through a torque transmission mechanism, the hub boss 4 having a notch 5 on the outer periphery and fixed to the transmission shaft 2 by a cylinder. A hub boss portion 4, the casing 3, and a ball 7 housed in a radial hole 6 of the casing 3 and engageable with the notch portion 5 in a cylindrical casing 3. A torque control mechanism A including an elastic member 8 for elastically urging the ball 7 in the inner diameter direction of the hub boss portion 4, and further to the left and right of the cutout portion 5 when viewed from the axial direction of the transmission shaft 2. A water gate lifting handle characterized in that the ball contact angles θ ₁ and θ ₂ of the inclined surfaces 5a and 5b are different from each other.