JP3036631B2 - Water tap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to an improved water drainage plug, and more particularly to an improved water drainage plug that facilitates piston replacement. In addition, the present invention can perform the lever or handle operation smoothly,
Also, the present invention relates to a packing that is mounted on a piston of a water drainage plug without being likely to fall out of a storage groove.

[0002]

2. Description of the Related Art In cold regions, water pipes are buried in the ground below the freezing depth in order to avoid freezing, but the branch pipe of each house connected to the water pipe is a rising pipe. It leads to each indoor. Therefore, if water is not supplied to each house for a certain period of time in winter, water that is higher than the freezing depth of the riser may freeze. In order to avoid such a situation, in cold regions, a water drainage plug that can discharge water in a pipe when not in use is used.

Various types of drain plugs have been developed and sold on the market. Basically, a conventional drain plug is housed in a lower main body 50 of the drain plug as shown in FIG. By raising and lowering the piston 52, the drain plug is set in a water supply state or a drain state. The elevation of the piston 52 is performed by operating a handle or lever (not shown) attached to the upper end of the middle shaft 54 connected to the upper end of the piston 52 via an intermediate member such as a spindle (not shown). It is done by doing.
Then, in the conventional water drainage stopper, the concave portion 56a at the lower end of the idle shaft 56 is inserted into the convex portion 52a at the upper end of the piston 52 and joined by the spring pin 58, and the middle shaft 54 is screwed to the idle shaft 56. I have. In this case, the piston 52
There is a gap between the convex portion 52a at the upper end of the shaft 52 and the concave portion 56a at the lower end of the idle shaft 56, and there is also a gap between the spring pin insertion hole of the piston 52 and the spring pin 58. Even if it is installed with an inclination, such an inclination is absorbed by the idler shaft 56 and the piston 52 is not affected. Therefore, the piston 5
2 causes the outer surface of the piston 52 to come into contact with the inner surface of the lower body 50, and the lever or handle is operated heavily when the piston 52 is raised or lowered, or the inner surface of the lower body 50 is damaged, causing a water leakage accident. Is avoided. Also,
The spring pin for joining the piston 52 and the idler shaft 56 is hollow and elastic, and the diameter of the spring pin insertion hole of the idler shaft 56 is usually slightly smaller than the outer diameter of the spring pin 58. The spring pin 5
8 does not fall off easily.

[0004]

However, in the case of the conventional water drainage stopper, since it is troublesome and troublesome to remove the spring pin 58, when the piston 52 needs to be replaced due to damage or the like, the sprig pin 58 is required. Without removing the screw connection between the middle shaft 54 and the idler shaft 56, and removing the piston 52 and the idler shaft 56 together for replacement. In addition, since the spring pin 58 has a hollow thin-walled structure and is not strong in strength, when the piston 52 is pulled out in a state in which a foreign object is caught in the gap between the outer surface of the piston 52 and the inner surface of the lower body 50, Since a large shear force may act on the spring pin 58 to break the spring pin 58, the piston 52 alone cannot be replaced, and the entire water drainage plug must be replaced.

On the other hand, packings 60a, 60b, 60 are provided on the piston 52 in order to seal a predetermined portion in the lower main body 50 in accordance with the state of water supply or the state of drainage of the water tap.
c, 60d are installed, and as packing, usually
A JIS standard O-ring is used. However, such a conventional configuration has the following problems. That is, first, the O-ring has a circular cross section when not mounted, but when mounted on the piston 52,
Since the diameter of the O-ring receiving groove 62 of the piston is larger than the inner diameter of the packing, that is, the O-ring 60, the cross section of the O-ring 60 becomes elliptical as shown in FIG. Since the outer diameter of the O-ring 60 when the piston is mounted is formed to be larger than the inner diameter of the lower body 50, when the outer periphery of the O-ring 60 contacts the inner periphery of the lower body 50, the O-ring 60 Outer circumference and lower body 5
The contact area with the inner periphery of 0 becomes large. Therefore, the sliding resistance between the O-ring 60 and the lower main body 50 increases, and especially when the operation from the water supply state to the water drainage state or the operation from the water drainage state to the water supply state is not performed for a long time, the adhesive force becomes large. Therefore, there is a problem that the operation of the lever or the handle becomes heavy. Second, when the drain plug is changed from the water supply state to the water drain state, the O-ring 60c is
At this time, a water flow as shown by an arrow in FIG. 6 is generated around the O-ring 60c, and the O-ring 60c is subjected to upward water pressure and flow velocity from below. However, this causes a problem that the O-ring 60c may fall off above the O-ring housing groove 62.

[0006] Accordingly, an object of the present invention is to provide a water drainage plug in which a piston can be easily replaced.

[0007]

According to a first aspect of the present invention, there is provided a water drainage stopper including a lower body to which a water pipe is connected and to which a drain valve is mounted, and an outer tube screwed to the lower body. A piston housed in the main body is connected to a spindle housed in the mantle tube via a middle shaft housed in the mantle tube, and a water supply state or water is operated by operating a lever or a handle attached to the spindle. In a water drainage plug configured to be in a drained state, a concave portion having a size slightly larger than a lower end of the middle shaft is formed at an upper end of the piston, and a cross section is formed at a portion where the concave portion of the piston is formed. In the lower end of the middle shaft, a through hole is formed at the lower end of the middle shaft, which is aligned with the lateral hole of the piston when the lower end of the middle shaft is inserted into the recess of the piston. And the middle shaft are connected by inserting the lower end of the middle shaft into the recess of the piston and inserting a solid pin having a diameter slightly smaller than the diameter of the lateral hole into the lateral hole and the through hole. The position where the solid pin is inserted at the upper end of the piston is covered with a cover for preventing the solid pin from falling off.

[0008]

[0009]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. A drain valve according to a preferred embodiment of the present invention, generally indicated by reference numeral 10 in FIG. 1, includes a lower body 12 and an outer tube 14 screwed to an upper end of the lower body 12. In FIG. 1, the lower body 12 includes an upper half portion 12a.
And the lower half portion 12b, but may be formed as an integral body.

A water pipe connecting portion 16 for connecting to a water pipe (not shown) is provided on one side of the lower main body 12. The water stop valve 18 is attached by a stop pin 18a. On the other side of the lower body 12, the lower body 12
A discharge valve 20 for discharging water from the inside is provided.

A piston 22 is accommodated in the lower body 12. The piston 22 has a vertical hole 22a extending in the length direction and opened at a lower end of the piston 22, and a horizontal hole 22b provided at an upper portion of the piston 22 and extending laterally so as to communicate with the vertical hole 22a and open at a side surface. have. A reduced diameter portion 22c having a smaller diameter than the other portions is formed at a substantially central portion of the piston 22. Also, the lower body 12
A water supply port 24 is provided above.

At the upper end of the piston 22, a recess 22d is provided. Also, a recess 22d at the upper end of the piston 22
Is provided in the transverse hole 2 that penetrates in the transverse direction.
2e is formed.

The lower end of the middle shaft 24 is inserted into the recess 22d at the upper end of the piston 22. Middle shaft 24
When the lower end of the middle shaft 24 is inserted into the recess 22d of the piston 22, a through hole 24a is formed at the lower end of the shaft 22 so as to align with the lateral hole 22e of the piston 22, and a solid pin is formed in the lateral hole 22e and the through hole 24a. By inserting 26, the piston 22 and the middle shaft 24 are fixed so as not to come off. The diameter of the recess 22d of the piston 22 is
The diameter of the lateral hole 22e of the piston 22 is selected to be slightly larger than the diameter of the
6 is selected to be slightly larger than the diameter. Further, a portion where the solid pin 26 of the upper end of the piston 22 is inserted is covered with a cover 28 for preventing the solid pin 26 from dropping off. The cover 28 may be formed of any resin material, or may be formed of rubber.

The upper end of the middle shaft 24 is screwed to the middle shaft suspension 30. The middle shaft suspension 30 is connected to a spindle 32 housed in the upper part of the mantle tube 14, and an operation lever 34 is attached to the spindle 32. Thus, the piston 22 in the lower main body 12 can be moved up and down by moving the lever 34 up and down.

On the other hand, a packing receiving groove 36 is formed in the piston 22 above and below the reduced-diameter portion 22c and above and below the lateral hole 22e, and a packing 38 is formed in the packing receiving groove 36, respectively. Is housed. The packing 38 has a ring-shaped planar shape. As shown in FIGS. 2 and 3, the cross section of the packing 38 is formed such that a portion accommodated in the packing accommodation groove 36 substantially conforms to the shape of the packing accommodation groove 36. The portion (that is, the outer peripheral portion) that is not accommodated in the packing accommodating groove 36 is formed to have a substantially triangular shape having an apex 38a extending outward at a substantially central portion thereof.

In the above description, “substantially fit” means that the upper end 36 a and / or the lower end 36 b of the packing receiving groove 36 and the packing 38
There is also a case where there is a slight gap between the upper surface and / or the lower surface of the packing (in FIGS. 2 and 3, there is a slight gap between the lower end 36b of the packing accommodation groove 36 and the lower surface of the packing 38). . When the apex 38a located at the outer peripheral portion of the packing 38 comes into contact with the inner surface of the lower main body 12, the gap may disappear due to elastic deformation of the packing 38. Note that the packing 38 is formed of an elastic material similar to the material of a normal O-ring.

The present invention is not limited to the above embodiments of the invention, and various modifications can be made within the scope of the invention described in the claims. It goes without saying that it is included in.

For example, in the above-mentioned embodiment, a water tap having an operating lever is shown, but other types of water taps such as a water tap having a handle in place of the lever are shown. In unplugging, the above-described connection method between the piston and the middle shaft may be used. Further, in the above embodiment, the packing accommodation groove has a substantially “U” shape, but the packing accommodation groove may be formed to have another shape. In this case, the shape of the portion of the packing received in the packing receiving groove is formed so as to substantially conform to the shape of the packing receiving groove.

[0019]

According to the water drainage stopper of the present invention, the replacement of the piston can be easily performed without the need for a special tool, and the idle shaft is not required. Contribute. In addition, since a solid pin is used for joining, the strength becomes stronger as compared with a case where a spring pin is used.

According to the packing of the present invention, since the contact area between the packing and the inner surface of the lower body is small, the sliding resistance is reduced, and even if the drain valve is not operated for a long period of time, the adhesiveness is reduced. Since the force is small, the operation of water drainage can be performed smoothly. Further, since the entire inside of the packing is in contact with the packing receiving groove, the packing does not come off from the packing receiving groove even when an upward water pressure acts on the packing.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a water drainage stopper according to a preferred embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a part of the packing of the present invention.

FIG. 3 is a cross-sectional view showing a part of the packing of FIG. 2 when changing from a water supply state to a drainage state.

FIG. 4 is a cross-sectional view showing a conventional water drainage stopper.

FIG. 5 is a cross-sectional view showing a part of a conventional packing.

FIG. 6 is a cross-sectional view showing a part of the packing of FIG. 5 when changing from a water supply state to a water draining state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Water drainage 12 Lower body 14 Mantle tube 22 Piston 22d Depression 22e Side hole 24 Middle shaft 24a Through hole 26 Solid pin 28 Cover 36 Packing accommodation groove 38 Packing

Claims (1)

(57) [Claims] 1. A lower body to which a water pipe is connected and to which a drain valve is attached, and a mantle tube screwed to the lower body, wherein a piston housed in the lower body is housed in the mantle tube. A water drainage plug connected to a spindle housed in a mantle tube via a middle shaft and configured to operate a lever or a handle attached to the spindle to supply water or drain water, At the upper end, a concave portion having a size slightly larger than the lower end of the middle shaft is formed, and at a place where the concave portion of the piston is formed, a transverse hole penetrating in the transverse direction is formed, and at the lower end of the middle shaft, When the lower end of the middle shaft is inserted into the recess of the piston, a through hole is formed that is aligned with the lateral hole of the piston. It is connected by inserting a solid pin having a diameter slightly smaller than the diameter of the lateral hole into the lateral hole and the through hole by inserting the solid pin into the recess, and inserting the solid pin at the upper end of the piston. The draining plug is covered with a cover for preventing the solid pin from falling off.