JPH0531342Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a locking device for the operating lever of the valve body in a type of valve such as a butterfly valve that opens and closes by rotating the valve body, and in particular, the invention relates to a locking device for the operating lever of the valve body in a type of valve such as a butterfly valve that opens and closes by rotating the valve body. is possible,
This invention relates to a locking device for an operating lever that can easily lock and release the lever.

(Prior Art) Conventionally, as various types of drive devices such as butterfly valves that rotate the valve body to open and close, there have been manual drive devices in which an operating lever is attached to the valve stem and the operating lever is manually rotated. is publicly known. In such a manual drive device, in order to prevent erroneous operation of the valve body, especially when there is no need to change the set opening degree for a long period of time, and to maintain the set opening degree of the valve body, A lock mechanism is attached to the operating lever.

FIG. 7 shows an example of a conventional locking mechanism, in which a control lever 2 is attached to a valve stem 1, and a lock lever 4, which is always biased in the locking direction by a spring 3, is pivoted to the control lever 2.
This structure engages with a lock portion 6 formed on the main body 5, and is disclosed in Japanese Patent Publication No. 46-28945.

To open and close the valve body 7, the lock lever 4 is held so as to rotate against the repulsive force of the spring 3, and the tip of the lock lever 4 having a W-shaped groove (not shown) is inserted into the brake band 8. By widening both ends, the brake groove disk 9 is engaged and disengaged from the lock portion 6, and the operating lever 2 is rotated while the lock lever 4 is being gripped. By rotating the operating lever 2, the valve stem 8
is rotated to open and close the valve body 7. After the predetermined opening and closing, if you release your grip on the lock lever 4,
The lock lever 4 rotates due to the elastic force of the spring 3, and its tip engages with the lock portion 6, resulting in a locked state.

(Problems to be solved by the invention) In the conventional operating lever locking device shown in Fig. 7, the lock lever must be grasped to release the lock, so the valve must be mounted at a high place or on the floor. When the lever is closed, there is a problem in that the operability of the lever is poor and work efficiency is reduced. Furthermore, since the lock lever is always attached and cannot be removed, anyone can operate it, and there is a risk of failure due to incorrect operation or damage due to collision of other objects with the lever. Further, when packaging, the length of the operating lever and the locking lever increases the packaging volume, which poses a problem of increasing packaging costs, transportation costs, and inventory costs.

(Means for Solving the Problems) This invention has been made to solve the above problems, and includes a valve stem 12 that pivots to open and close the valve body 11 of a type of valve that opens and closes by rotation. An adapter 14 having an extending plate 17 extending in a direction perpendicular to the valve stem is connected to the outer end of the valve stem, and a main lever 19 formed to have a length substantially matching the diameter of the main body 10 is pivoted to the adapter 14. A hook portion 21 is formed at the tip of the main lever 19 to fit into a notch 25 of an opening plate 23 fixed to the main lever 10, and an auxiliary lever 27 is detachably connected to the rear end of the main lever 19. A spring 31 is stretched between the rear part of the main lever 19 and the upper surface of the extension plate 17 of the adapter 14 so that the hook part 21 at the tip of the main lever 19 is always fitted into the notch 25 and the rear end is raised. It is characterized by

(Operation) The auxiliary lever is depressed and the main lever is pivoted downward against the spring. As the main lever pivots, the hook at the tip of the main lever releases the notch in the opening plate, allowing free relative rotation between the main lever and the opening plate. can be rotated. When the pressing force on the auxiliary lever is removed, the main lever pivots upward due to the repulsive force of the spring, and the hook portion engages with the notch, resulting in a locked state in which rotation is impossible. By removing the auxiliary lever from the main lever, the force point of the lever is substantially brought closer to the fulcrum, and the force applied to the leveraged lever increases, making it impossible to move the lever easily.

(Embodiments) Preferred embodiments of this invention will be described below with reference to the drawings. Although the illustrated embodiment relates to a butterfly valve, it is not limited to this, and can be applied to all valves whose valve bodies are opened and closed by rotating a valve stem.

In the figure, reference numeral 10 denotes a main body of a butterfly valve having a substantially cylindrical shape, in which a disc-shaped valve body 11 is rotatably supported, and a valve stem 12 that supports the valve body 11 is attached to the main body 10. It extends to the outside through the valve stem cylinder 13. An adapter 14 is attached to the outer end of the valve stem 12.
are inserted, and both 12 and 14 are integrated in the rotational direction by a key. As shown in FIG. 5, the adapter 14 has a shaft hole 15 penetrated through the center.
5 is provided with a keyway 16. adapter 14
An L-shaped extension plate 17 extending laterally is integrally formed in the holder, and a cylindrical projection 18 is formed approximately at the center of the upper surface of the extension plate 17 .

Reference numeral 19 denotes a main lever, which is attached to the adapter 14 at approximately the center using a shaft pin 20 so as to be able to freely pivot in the vertical direction. The main lever 19 and the adapter 14 are integrated in the rotational direction, and when the main lever 19 is rotated in the horizontal direction, the valve stem 12 can be rotated via the adapter 14. As shown in FIG. 4, the main lever 19 has a hook portion 21 at its tip that fits into a notch 25 of an opening plate 23, which will be described later, and a protrusion 22 that abuts with the protrusion 18 on its rear lower surface. A spring 31 is tensioned between the main lever 19 and the adapter 14, and the main lever 19 is always connected to the hook portion 21 at the tip.
is biased in the direction of fitting into the notch 25 of the opening plate 23. In the illustrated embodiment, the spring 31 uses the shaft pin 20 that pivotally supports the main lever 19 and the adapter 14 as a spring pin, but the spring pin is not limited to this. When the rear end of the main lever 19 is pushed down against the spring 31 until the two protrusions 18 and 22 collide with each other, the main lever 19
9 and the opening plate 23 are disengaged, and the main lever 19 can freely rotate.

An opening plate 23 is fixed to the upper surface of the valve stem cylinder 13, and a scale plate 24 is stacked on the upper surface of the opening plate 23, and both plates 23 and 24 can be rotated relative to each other as necessary. It is. By allowing relative rotation between the opening plate 23 and the scale plate 24, it is possible to match the scale and the position of the valve body in accordance with the mounting direction of the main lever 19.

A thrust plate (not shown) is provided between the scale plate 24 and the adapter 14 located on its upper surface.
is interposed to reduce frictional resistance during rotation and to prevent the valve and adapter 14 from sticking together due to rust.

As shown in FIG. 6, the opening plate 23 has a plurality of notches 25 on its periphery, and stopper plates 26 are formed at both ends of the notches 25 to stand upright at right angles. The height of the stopper plate 26 is the same as that of the main lever 19.
The height is sufficient for the main lever 19 to collide with the main lever 19 even when the tip is rotated in the vertical direction and the tip is raised. A coating made of synthetic resin such as nylon is formed on the stopper plate 26 by, for example, dipping. By coating the stopper plate 26, it is possible to prevent the paint from peeling off when the main lever 19 collides with it, and if it is colored, the open/close position of the main lever 19 can be easily recognized from a distance. Dew.

As shown, the main lever 19 is formed to have a length that substantially matches the diameter of the main body 10, thereby reducing the space required for packaging. The main lever 19 has an auxiliary lever 27
is detachably connected. 28 is the auxiliary lever 27
This is a lock screw that can be easily unscrewed with fingers, and a rubber ring 29 is interposed between the head 30 of the lock screw 28 and the main lever 19 to prevent loosening. By connecting the auxiliary lever 27, the main lever 19 can be easily moved up and down and rotated, and conversely, by removing the auxiliary lever 27, the main lever 19 cannot be operated, thereby preventing erroneous operation. It is possible to plan.

The adapter 14 and the valve stem 12 are
A hexagonal socket set screw is engaged with a groove formed on the outer circumferential surface of the hexagonal socket to prevent it from coming off.

(Effect of the invention) According to this invention, the lock with the opening plate 23 can be released by pushing down the main lever 19 via the auxiliary lever 27, and the main lever 19 can be rotated. The valve can be opened and closed by hand or foot, and even if the valve is installed at a high place or on the floor, there is no risk of poor operability and work efficiency can be improved. In addition, the main lever 19 is formed to have approximately the same length as the main body of the valve, and is operated by connecting the auxiliary lever 27. Therefore, by removing the auxiliary lever 27, the packing volume can be reduced and the packaging can be carried out. In addition to reducing costs, transportation costs, and inventory costs, the main lever 1
This makes it possible to prevent erroneous operations as described in item 9.

[Brief explanation of the drawing]

Fig. 1 is a front view of the valve according to this invention, Fig. 2 is a plan view thereof, Fig. 3 is a front view of the main parts, Fig. 4 is a perspective view of the main lever, Fig. 5 is a perspective view of the adapter, FIG. 6 is a perspective view of the opening plate, and FIG. 7 is a front view of a conventional drive device. 10...Main body, 11...Valve body, 12...Valve stem,
13... Valve stem cylinder, 14... Adapter, 15...
Shaft hole, 16...keyway, 17...extension plate, 18...
...Protrusion, 19...Main lever, 20...Axis pin, 2
1...Hook portion, 22...Protrusion, 23...Opening plate, 24...Scale plate, 25...Notch, 26...
Stopper plate, 27... Auxiliary lever, 28... Lock screw, 29... Rubber ring, 30... Head,
31...Spring.

Claims (1)

[Scope of utility model registration request] Adapter 1 has an extension plate 17 extending in a direction perpendicular to the valve stem at the outer end of a valve stem 12 that pivotally supports a valve body 11 of a type of valve that opens and closes by rotation.
4, a main lever 19 formed to have a length that substantially matches the diameter of the main body 10 is pivotally attached to the adapter 14, and a notch of an opening plate 23 fixed to the main body 10 is attached to the tip of the main lever 19. 25 is formed, and the auxiliary lever 27 is removably connected to the rear end of the main lever 19, and the hook part 21 at the tip of the main lever 19 is always connected to the notch 25.
A locking device for a valve body operating lever, characterized in that a spring 31 is stretched between the rear part of the main lever 19 and the upper surface of the extension plate 17 of the adapter 14 so that the rear end thereof is fitted into the main lever 19 and raised. .