JP6263086B2 - Extension valve key for underground valve plugs and retainer - Google Patents

Description

  The present invention relates to underground valves such as water supply valves, soft seal gate valves, water control valves, butterfly valves, ball valves, etc., which are provided in underground pipes such as water pipes and agricultural water pipes embedded in the ground. The present invention relates to an additional valve key that is attached to a valve cap at the shaft head of a stopper, and more particularly, to a retainer that prevents the additional valve key from coming off the valve cap.

  Water pipes and agricultural water pipes buried in the ground are provided with underground valve plugs such as gate valves and butterfly valves for the purpose of adjusting the flow rate. These underground valve plugs are installed at the bottom of a cylindrical protective box buried in the ground. To open and close the underground valve plugs from the ground surface manually, After opening, the valve cap at the shaft head of the underground valve plugs is rotated using an opening / closing operation tool such as a torque wrench or a T-shaped handle.

  On the other hand, in the case of underground valve plugs installed deep in the ground, it is difficult to rotate the valve cap directly with the opening / closing operation tool. A valve key is attached to the valve cap of the shaft head in advance or retrofitted (for example, Patent Document 1). Specifically, the fitting valve key is attached to the valve cap by fitting a fitting recess provided at the lower end of the fitting valve key into the valve cap. Then, the valve cap on the shaft head of the underground valve plug is rotated by fitting the tip of the opening / closing operation tool to the head of the valve valve key and rotating it.

  However, simply by fitting the fitting recess into the valve cap, for example, when the valve cap is rotated, the opening / closing operation tool is lifted upward and then removed and removed from the valve key. ). In addition, the dimensional shape of the valve cap is determined by the official standard. If the valve key is to be formed of an integral casting to reduce the cost, it can be securely fitted in consideration of its dimensional accuracy. In order to achieve this, it is necessary to provide a clearance between the valve cap and the fitting recess. The presence of this clearance promotes the removal of the valve key, and also impairs the reliability of the rotation operation of the valve cap.

  Conventionally, as a countermeasure to prevent the extension valve key from coming off, there is known a method in which a bolt provided outside the fitting recess is tightened and fixed to the valve cap, as introduced in Patent Document 1 as a prior art. . However, since it is not possible to tighten bolts in an existing valve cap in a narrow cylindrical protective box, this method cannot be applied when a valve key is attached by retrofitting.

  On the other hand, Patent Document 1 proposes an add-on valve key (depth-measuring foot) having a retaining fitting. This is intended to prevent the depth-measuring foot rod from coming off by providing a retaining member at the fitting portion of the foot rod body and engaging the engaging portion of the retaining member with the control valve. However, in Patent Document 1, since the stopper fitting is engaged with the control valve, it is necessary to prepare a plurality of kinds of stopper fittings having different shapes and dimensions in accordance with the type and shape of the control valve. It lacks versatility.

Japanese Patent Laid-Open No. 11-50497

   The problem to be solved by the present invention is to provide a technique for preventing the detachment of the additional valve key, which is applicable to a case where a valve key is attached to the existing valve cap by retrofitting, and which is highly versatile. .

According to one aspect of the present invention, there is provided an additional valve key retaining member that is attached to a valve cap at a shaft head of underground valve plugs, and is fitted in a fitting recess of the additional valve key that fits into the valve cap. It is, have a frictional resistance portion that contacts the valve cap in the fitting recess, the friction resistance portion is made of resilient material, retaining device is provided.

  As described above, since the retainer of the present invention can be mounted in advance in the fitting recess of the additional valve key, the retaining effect is exhibited only by fitting the fitting concave of the additional valve key to the valve cap. Therefore, the present invention can be applied without any problem even when the valve key is attached by retrofitting to the existing valve cap.

  Further, as described above, the dimensional shape of the valve cap is determined by an official standard, and the dimensional shape of the fitting recess is also standardized accordingly. Since the retainer is mounted in the standardized fitting recess in this way, it can be applied to all valve caps that comply with the standard regardless of the presence or absence of the flange portion of the valve cap. high.

  Furthermore, even when the clearance is provided between the valve cap and the fitting recess as described above, the retainer according to the present invention fills the clearance and fits in a state in contact with the valve cap. Therefore, the occurrence of rattling can be suppressed in the rotation operation of the valve cap, and the rotation operation of the valve cap can be reliably performed. In addition, it is possible to suppress omission during the rotation operation.

The retainer according to the present invention has a retaining effect because when the fitting recess of the additional valve key is fitted into the valve cap, the friction resistance portion contacts the valve cap in the fitting recess and exerts a friction resistance force. Demonstrate. The frictional resistance unit that make up an elastic material. As a result, the frictional resistance portion can be elastically deformed and the frictional resistance force can be changed, so that the operation of fitting and removing the fitting recess from the valve cap can be performed smoothly. Moreover, even if the above-mentioned clearance fluctuates, it can be flexibly dealt with.

  As a more specific configuration of the frictional resistance portion, the frictional resistance portion may be one or a plurality of elastic pieces arranged along the inner peripheral surface in the vertical direction of the fitting recess. By positioning the frictional resistance portion (elastic piece) along the inner peripheral surface in the vertical direction of the fitting concave portion, it is possible to more stably exhibit the retaining effect. This stable retaining effect is further improved by arranging a plurality of elastic pieces.

  The elastic piece is preferably arranged in the fitting recess so as to bend toward the center side of the fitting recess and bulge. Thereby, the operation | movement which fits or removes a fitting recessed part to a valve cap can be performed more smoothly. Even when the clearance between the valve cap and the fitting recess is large, the bulging portion of the elastic piece reliably contacts the valve cap and exerts a frictional resistance, so that the retaining effect can be reliably obtained.

  By mounting the above-described retainer in the fitting recess, the additional valve key of the present invention is configured.

  ADVANTAGE OF THE INVENTION According to this invention, it is applicable also when attaching an additional valve key by retrofitting with respect to the existing valve cap, Furthermore, the versatility and the prevention technique of the extension valve key are provided. As a result, it is possible to easily obtain the effect of preventing the valve key from being removed with respect to the valve cap of any aspect and to improve the reliability of the rotation operation of the valve cap.

One Example of the retainer of this invention is shown, (a) Perspective view, (b) is a top view, (c) is a front view. It is a longitudinal cross-sectional view of the extension valve key by one Example of this invention which mounted | wore with the retainer of FIG. It is a longitudinal cross-sectional view which shows the state which attached the extension valve key of FIG. 2 to the valve cap of the shaft head of underground valve plugs. It is the longitudinal cross-sectional view which expanded the fitting recessed part part of the addition valve key in FIG. It is the longitudinal cross-sectional view which expanded the fitting recessed part part of the addition valve key in case a clearance is large.

  Embodiments of the present invention will be described below based on examples shown in the drawings.

  FIG. 1 shows an embodiment of the retainer of the present invention, in which (a) is a perspective view, (b) is a plan view, and (c) is a front view.

  The stopper 10 shown in FIG. 1 includes a square top plate 11, elastic pieces (friction resistance portions) 12 that are curved outwardly from each side of the top plate 11 and extend downward, and tips of the elastic pieces 12. And a locking portion 13 formed by bending the upper side of the upper side. The retainer 10 is integrally formed by punching and bending one aluminum thin plate. The material of the stopper 10 is not limited to aluminum, but the elastic piece 12 is preferably formed of an elastic material such as a soft metal.

  FIG. 2 is a longitudinal sectional view of the extension valve key 20 according to one embodiment of the present invention, to which the retainer 10 of FIG. 1 is attached. FIG. 3 is a longitudinal sectional view showing a state in which the additional valve key 20 of FIG. 2 is attached to the valve cap of the shaft head of the underground valve plug. FIG. 4 is an enlarged vertical sectional view of the fitting recess 21 portion of the additional valve key in FIG.

  The extension valve key 20 shown in FIG. 2 includes a fitting recess 21 that fits into a valve cap 31 (see FIG. 3) of the shaft head of the underground valve plug 30 at one end (lower end) in the longitudinal direction. The other end (upper end) of the head is provided with a head 22, and the upper end surface of the head 22 is provided with a reflector 23. The fitting recess 21 and the head 12 are connected via an intermediate portion 14. The head portion 12 and the intermediate portion 14 are manufactured as an integral casting of spheroidal graphite cast iron (FCD600), for example. The fitting recess 21 has a quadrangular frustum-shaped outer shape in accordance with the shape of the valve cap 31. The shape of the head 22 can be a normal quadrangular prism shape or a ball point shape.

  Here, reference numeral 40 in FIG. 3 is a cylindrical protective box embedded in the ground to protect the underground valve plugs 30. The protective box 40 is installed vertically and has a bottom plate at the bottom.

  Referring to FIG. 2, the stopper 10 is mounted in the fitting recess 21. Specifically, the retainer 10 is inserted into the fitting recess 21 with the top plate 11 facing upward, and the locking portion 13 is added and locked to the lower end surface of the valve key 20. In this way, when the locking portion 13 is added and locked to the lower end surface of the valve key 20, the fitting recess 21 with the stopper 10 attached thereto is inadvertently inserted into or removed from the valve cap 31. The stopper 10 can be prevented from being detached from the fitting recess 21. On the contrary, when the operator actively removes the stopper 10 from the fitting recess 21, the stopper 10 can be easily removed by pinching the locking portion 13.

  As shown in FIG. 2, each elastic piece 12 is arranged along each inner peripheral surface in the vertical direction of the fitting recess 21 in a state where the stopper 10 is mounted in the fitting recess 21. At the same time, the central portion in the vertical direction is curved and arranged so as to bulge toward the center of the fitting recess 21.

  When the fitting recess 21 fitted with the stopper 10 is fitted into the valve cap 31, as shown in FIG. 4, each elastic piece 12 is elastically contacted so as to surround the valve cap 31, and friction resistance Effect. As a result, the valve valve 20 is prevented from being removed.

  Since the retainer 10 of the present invention can be mounted in advance in the fitting recess 21 of the additional valve key, the retaining effect can be exhibited only by fitting the fitting recess 21 into the valve cap 31. Therefore, the retaining technique by the retaining tool 10 of the present invention can be applied without problems even when the valve key 31 is attached to the existing valve cap 31 by retrofitting.

  Further, in the embodiment, each elastic piece 12 is disposed along each inner circumferential surface in the vertical direction of the fitting recess 21, so that it is possible to more stably exhibit the retaining effect.

  Further, each elastic piece 12 is curved so as to bulge toward the center side of the fitting recess and is disposed in the fitting recess, so that the fitting recess 21 can be fitted to or removed from the valve cap 31. Can be performed more smoothly. Further, as shown in FIG. 5, even when the clearance between the valve cap 31 and the fitting recess 21 is large, the bulging portion of the elastic piece 12 reliably contacts the valve cap 31 and exerts a frictional resistance. A stopping effect can be reliably obtained.

10 Stopper 11 Top plate 12 Elastic piece (Friction resistance part)
DESCRIPTION OF SYMBOLS 13 Locking part 20 Additional valve key 21 Fitting recessed part 22 Head part 23 Reflective material 24 Middle part 30 Underground valve plugs 31 Valve cap 40 Protection box

Claims (4)

An extension valve key retainer that is attached to the valve cap of the shaft head of the underground valve plugs, and is mounted in a fitting recess of the extension valve key that fits into the valve cap, and in the fitting recess It has a frictional resistance portion that contacts the valve cap, the frictional resistance portion is made of resilient material, retaining device. The retainer according to claim 1 , wherein the frictional resistance portion is composed of one or a plurality of elastic pieces arranged along an inner circumferential surface in the vertical direction of the fitting recess. The retainer according to claim 2 , wherein the elastic piece is curved so as to bulge toward the center side of the fitting recess and is disposed in the fitting recess. An extension valve key, wherein the retainer according to any one of claims 1 to 3 is mounted in the fitting recess.

Images