JPH0245580Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a locking device for a handle that opens and closes a valve.

(Prior art) Conventionally, butterfly valves and other various valves
In order to close the valve or keep it closed for a certain period of time, a device is provided for locking the handle that opens and closes the valve. An example of such a locking device is the second
As shown in the figure, a handle shaft 2 having a handle 1 is connected via a worm wheel and a worm to the valve stem that drives and rotates the valve body, and a lock bolt 3 can be moved forward and backward from the handle shaft 2 in a direction perpendicular to the axial direction. The rotation of the handle shaft 2 is locked by the frictional collision between the outer peripheral surface of the handle shaft 2 and the tip of the lock bolt 3. In order to prevent the lock bolt 3 from loosening, a lock lever 5 is inserted between the lock bolt 3 and the main body 4, and the threaded portion of the lock bolt 3 and the main body 4, which are screwed together by rotation of the lock lever 5, is The lock bolt 3 is prevented from loosening by generating internal stresses that act in opposite directions.

(Problems to be Solved by the Invention) In the conventional locking device, only the tip of the locking bolt was in contact with the handle shaft, so the frictional force was small and the locking effect was small. If the lock bolt was tightened strongly to increase the frictional force, there was a risk of scratches on the outer circumferential surface of the handle shaft. Moreover, when the lock lever is tightened, the internal stress reduces the tightening force of the lock bolt by the backlash of the lock bolt, resulting in a reduction in the locking force. In addition, the locking operation required a two-step operation: tightening the locking bolt so that its tip collided with the handle shaft, and then turning the locking lever to prevent it from loosening. The lock bolt and lock lever protruded outward from the main body, giving it an unsightly appearance.

This invention attempts to overcome these drawbacks found in conventional locking devices. (Means for Solving the Problems) In order to solve the above problems, the means adopted by this invention are as follows: a handle shaft 14 having a handle 16;
The worm 13 is connected to the worm 13 so that the rotation direction is unified to the
Worm wheel 12 meshing with the worm 13
A bush 1 is connected to the valve stem 11 that drives the valve body so that the rotating direction is integrally inserted, and the bush 1 is inserted into the handle shaft 14.
The lock bolt 20, which is in contact with one end surface of the worm 13 and the other end surface of the bush 18, is screwed into the main body 10 so as to be freely retractable in the axial direction along the handle shaft 14. Put the worm 13 into the bush 18 and the main body 10.
It is characterized by being made to collide with each other with a frictional force.

(Operation) When the lock bolt is threaded along the axial direction of the handle shaft, the tip end surface of the lock bolt pushes one end surface of the worm through the bush, and further presses the other end surface of the worm against the main body. When the worm comes into pressure contact with the bush and the main body, a large frictional force is generated on both end faces of the worm, preventing the worm from rotating and becoming locked. Further, by interposing the elastic body between the lock bolt and the bush, the repulsive force of the elastic body acts on the lock bolt, thereby preventing the lock bolt from loosening.

(Effects of the invention) According to this invention, the handle shaft can be locked and unlocked simply by screwing the lock bolt forward and backward along the axial direction of the handle shaft, and an elastic body is interposed between the lock bolt and the bush. As a result, locking can be achieved at the same time, one-touch operation is possible, and the locking bolt and locking means do not protrude outward from the main body, so the appearance is good. In addition, locking is performed by surface contact between the end face of the worm and the bush or main body, and the lock bolt only moves in the axial direction along the handle shaft, and since all parts are in contact with the surface, there is no contact between the handle shaft and the worm body. Not only is there no risk of damaging the bushing, etc., but also a large frictional force can be obtained, increasing the locking effect.

(Embodiment) A preferred embodiment of this invention will be described below with reference to FIG. In the figure, reference numeral 10 denotes a gearbox main body, from which a valve stem 11 for driving a valve body extends, and a worm wheel 12 is connected to the tip of the stem 11 so as to rotate integrally. 13 is a worm that meshes with the worm wheel 12, into which the handle shaft 14 is inserted, and the spring pin 1
5, the rotation directions are unified and connected. One end of the handle shaft 14 is supported by the main body 10, and the other end extends outside the main body 10, and a handle 16 is fixed to the tip thereof.

A spacer 17 is inserted between one end of the worm 13 and the main body 10, and a bush 18, which is inserted into the handle shaft 14, is in contact with the other end of the worm 13, and the other end of the bush 18 is connected to the main body. It is held within the main body 10 by coming into contact with a cap 19 fixed to the main body 10.

A lock bolt 20 is inserted into the handle shaft 14 so as to be freely movable in the axial direction, and is screwed into the cap 19 so as to be able to move forward and backward. lock bolt 20
The tip can freely collide with the bush 18 via an elastic body 21 such as rubber or a spring.

When the lock bolt 20 is screwed forward and the bush 18 is pushed while compressing the elastic body 21, the bush 18
The worm 13 is pressed against the spacer 17 by the pressing force. In this way, the worm 13 is in a state in which the bush 18 and the spacer 17 are in frictional contact with each other on both end surfaces, and the rotation of the worm 13 is prevented, resulting in a locked state. In this locked state, the repulsive force of the compressed elastic body 21 is applied to the lock screw 20, so that the lock screw 20 is prevented from loosening at the same time.

When the lock bolt 20 is retreated, the elastic body 21
The compressive force is removed, and the pressing force applied to the worm 13 via the bush 18 is also released, so there is no frictional collision between the worm 13 and the bush 18 or the spacer 17. Thus handle 16
Rotation of the handle shaft 14 is allowed through the worm 13 and the worm wheel 12 that meshes with the worm 13, and the rotation of the handle 16 is transmitted to the valve stem 11 to open and close the valve body.

Note that the spacer 17 inserted between the worm 13 and the main body 10 is not necessarily necessary, and it goes without saying that the worm 13 may be brought into direct contact with the inner wall of the main body 10. Further, the lock bolt 20 may be screwed into the main body 10.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing this invention, and FIG. 2 is an external view showing a conventional locking device. 10... Main body, 11... Valve stem, 12... Worm wheel, 13... Worm, 14... Handle shaft, 15... Spring pin, 16... Handle, 17... Spacer, 18... Bush, 1
9... Cap, 20... Lock bolt, 21...
...Elastic body.

Claims (1)

[Claims for Utility Model Registration] (1) A worm 13 is connected to a handle shaft 14 having a handle 16 so that the rotating direction is unified, and a worm wheel 12 that meshes with the worm 13 is connected to a valve stem 11 that drives a valve body. One end of a bush 18 which is connected together in the rotating direction and is inserted into the handle shaft 14 is brought into contact with one end surface of the worm 13, and the lock bolt 20 which is brought into contact with the other end surface of the bush 18 is moved along the handle shaft 14. The worm 13 is screwed into the main body 10 so that it can move forward and backward in the axial direction.
8 and a main body 10 are brought into contact with each other with frictional force. (2) The locking device according to claim 1, which is a utility model, characterized in that an elastic body 21 is interposed between the lock bolt 20 and the bush 18.