JPH0681383A - Water/hot water mixing device - Google Patents

Abstract

PURPOSE:To improve the usability, operability, and safety by providing an elastic body integrally with either one of a movable section interlocked with the action of a lever handle and a fixed section not moved by the action of the lever handle, and forming rugged sections coupled with or released from the elastic body by the action of the lever handle on the other. CONSTITUTION:A vertical hole 30 is bored near the rear from the center of a movable valve 12, a coil spring 31 is put in the vertical hole 30, and a hard ball 32 is elastically pressed to a slide contact face with a fixed valve 11 by the elasticity of the coil spring 31. Many spherical recesses 33 are provided as rugged sections in the range where the hard ball 32 can be brought into contact by the reciprocation and rotation of the movable valve 12. When a lever handle is operated vertically and to the right or left to reciprocate and rotate the movable valve 12, the hard ball 32 is coupled with or released from the spherical recesses 33, and the feeling is given to the lever handle when the flow and temperature are adjusted. The criteria for the flow adjustment and temperature adjustment are obtained, and the desired flow or the desired temperature can be easily set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly attached to a sink, a washbasin, a bathroom, etc.
The present invention relates to a structure of a single-lever type hot and cold water mixing apparatus that can control the flow rate and temperature of mixed water discharged by operating right and left.

[0002]

2. Description of the Related Art An example of a single lever type hot and cold water mixing apparatus is shown in FIGS. In the figure, 2 and 3 are a hot water supply pipe and a water supply pipe connected to the back surface of the apparatus main body 1, and the hot water supply pipe 2 and the water supply pipe 3 communicate with the hot water supply source and the water supply source, respectively. A hot water supply chamber and a water supply chamber that communicate with the hot water supply pipe 2 and the water supply pipe 3 are formed in the apparatus main body 1, respectively. The apparatus main body 1 has a horizontally long tubular shape, and a tubular standing portion 4 is integrally formed on the upper surface thereof, and a tubular protruding portion 5 is integrally formed on the front surface thereof.

A mixing valve assembly 6 is housed in the tubular upright portion 4. This mixing valve assembly 6 is a plate-shaped fixed valve in which a hot water valve port 9 communicating with the hot water supply chamber and a water valve port 10 communicating with the water supply chamber are provided on a bottom plate 8 of a cylindrical case body 7. 11
Is fixed, and a plate-shaped movable valve 12 is arranged on the fixed valve 11, and the movable valve 12 is fixed to the fixed valve 11 by a pressing body 13 so that the movable valve 12 can move forward and backward and rotate on the fixed valve 11. It is being pressed against. The pressing body 13 is rotatably accommodated in the case body 7. And the pin 14 is attached to the pressing body 13.
The connecting rod 15 is pivotally supported thereby, and the inner end of the connecting rod 15 is loosely fitted in the recess 16 formed on the upper surface of the movable valve 12.
Reference numeral 17 denotes a seal packing on the outer periphery of the pressing body 13, and 18 denotes a sliding ring on the lower surface of the pressing body 13. Numeral 19 is a tightening cylinder screwed to the inner circumference of the upper opening edge of the tubular upright portion 4 for fixing the mixing valve assembly 6 in the tubular upright portion 4.

A lever handle 21 is fixed to the outwardly projecting end of the connecting rod 15 with a screw 20. Reference numeral 22 is a spherical cover fixed on the lever handle 21 so as to cover the screw 20. Reference numeral 23 is a mixing chamber continuous with the tubular protrusion 5. A discharge pipe 24 is connected to the tubular protrusion 5.

In the hot and cold water mixing device thus constructed,
When the lever handle 21 is operated up and down, the movable valve 12 moves back and forth on the fixed valve 11, and the opening areas of the hot water valve opening 9 and the water valve opening 10 are adjusted at the same time, so that the mixing chamber 23 and the discharge pipe 2
The amount of mixed hot and cold water flowing out to 4 is controlled. When the lever handle 21 is operated to the left or right, the movable valve 12 rotates on the fixed valve 11 and the ratio of the opening areas of the hot water valve opening 9 and the water valve opening 10 is adjusted, so that the mixture flows into the mixing chamber 23 and the discharge pipe 24. The temperature of the mixed water can be controlled as desired.

[0006]

However, in such a single lever type hot and cold water mixing apparatus, the lever handle 21 is used.
Since the vertical operation width of is generally small and it is only 23 degrees in the example of the figure, it will be fully opened or closed at once, so it will be very difficult to adjust the flow rate, and from full open to full close in a short time. Since it moves, it has the drawback that water is abruptly stopped and water hammer is likely to occur.

When the lever handle 21 is operated left and right to control the temperature of the mixed water, the lever handle 2
There is no safety stopper even if 1 is operated to the high temperature side.
Since there is nothing to detect the temperature position by touch, there is a risk that hot water may be suddenly discharged and burns may occur due to an erroneous operation. Furthermore, since the spout water and temperature control are operated by the same lever handle, the lever handle will move to the left and right at the same time even if you try to operate the lever handle only up and down to stop spouting water, at the same temperature. However, there is a drawback that it is difficult to re-water and the operability is not good.

A single lever type hot and cold water mixing device of this type is disclosed in Japanese Patent Laid-Open No. 62-261766, 4-1.
Although it is also known from Japanese Patent No. 267 and Japanese Patent Laid-Open No. 50-44525, the above-mentioned drawbacks are common problems in this type of single lever type hot and cold water mixing apparatus.

[0009]

SUMMARY OF THE INVENTION The hot and cold water mixing apparatus of the present invention is intended to solve the above problems. By operating a single lever handle up and down and left and right, a movable valve moves forward and backward on a fixed valve. The hot water valve opening that is rotated and opened in the fixed valve,
In a hot and cold water mixing device that controls the flow rate and temperature of the mixed water by adjusting the opening area of the water valve opening,
An elastic body is integrally provided on either the movable portion that is interlocked with the operation of the lever handle or the fixed portion that does not move by the operation of the lever handle, and the other has an uneven portion that is engaged and disengaged by the elastic body when the lever handle is operated. It is characterized by being formed.

Further, according to the present invention, in the hot water mixing apparatus,
It is characterized in that the concavo-convex portion where the elastic body engages and disengages is formed so as to have a small pitch or a large undulation as the temperature of the mixed water is controlled to be high by operating the lever handle.

Further, the present invention is characterized in that the hot and cold water mixing apparatus is provided with an uneven portion for engaging and disengaging the elastic body when at least controlling the flow rate of the mixed water by operating the lever handle. Is.

[0012]

The tactile sensation that the elastic body engages and disengages with the concave-convex portion is obtained as the lever handle is operated, which improves usability and improves safety and operability.

[0013]

Embodiments of the present invention will now be described with reference to the drawings. In the embodiment shown in FIGS. 4 and 5, the movable valve 12 of the hot and cold water mixing apparatus shown in FIGS. 1 and 2 is provided with an elastic body, and the fixed valve 11 is provided with an uneven portion for engaging and disengaging the elastic body. It will be.
That is, as shown in FIG. 4, a vertical hole 30 is formed near the center rear of the movable valve 12, a coil spring 31 is inserted in the vertical hole 30, and a hard ball 32 slides on the fixed valve 11 by the elasticity of the coil spring 31. As shown in FIG. 5, the fixed valve 11 is elastically pressed against the contact surface, and a spherical concave portion 33 is formed as an uneven portion in the range where the hard ball 32 can come into contact with the movable valve 12 by the forward / backward movement and the rotational movement of the movable valve 12, as shown in FIG. When the movable handle 12 is moved back and forth and rotated by operating the lever handle 21 up and down and left and right, the hard balls 32 engage and disengage from the spherical recesses 33, thereby adjusting the flow rate and adjusting the temperature. Sometimes the lever handle 2
It is designed so that the touch feeling can be obtained.

In the embodiment of the fixed valve 11 shown in FIG. 5, the feel of engagement and disengagement of the hard balls 32 can be obtained during both the flow rate adjustment and the temperature adjustment, but as shown in FIG. When a large number of concave grooves 34 are radially formed in the concave-convex portion 11 as shown in FIG. 11, the hard balls 32 are engaged with and disengaged from the concave grooves 34 only when the movable valve 12 is rotated, so that the feeling of engagement and disengagement can be obtained only when the temperature is adjusted. To be For this reason, this form is desirable when stopping water discharge without changing the temperature of the mixed water or when adjusting the flow rate. Further, in the embodiment shown in FIG. 7, three fixed concentric grooves 35 are formed in the fixed valve 11, and the movable valve 12
Since the hard ball 32 engages and disengages with the concave groove 35 only when moving forward and backward, the feeling of engagement and disengagement can be obtained only when the flow rate is adjusted.

Further, the embodiment shown in FIGS. 8 and 9 has a large number of grooves 36 formed radially as in the case of FIG.
In FIG. 8, when the lever handle 21 is operated to the left so that the temperature of the mixed water becomes high, the groove 36 is formed such that the pitch of the groove 36 is gradually reduced to form a small pitch. When the operation is performed to the high temperature side, the feeling of engagement and disengagement of the hard balls 32 is obtained at a narrower interval, and the operator is naturally given a caution signal that the hot water of high temperature is discharged. In FIG. 9, for the same reason, the depth and width of the concave groove 36 are made larger toward the high temperature side and the undulations thereof are made larger so that a larger engagement / disengagement feeling can be obtained as the lever handle 21 is operated to the higher temperature side. It was done like this.

Although FIG. 6, FIG. 8 and FIG. 9 show an example in which a large number of concave grooves are formed over the entire range of temperature adjustment, concave and convex portions such as concave grooves are formed only on the high temperature side to discharge hot water. Only a warning may be given.

Further, in the example shown in FIG. 7, three concave grooves 35 are provided.
Although the feel of engagement and disengagement can be obtained over substantially the entire flow rate adjusting range by providing the above, as shown in FIG. 10, the concaves with which the hard balls 32 engage when the flow rate of the mixed water is controlled to a small amount. Even if only one groove 35 is formed, the engagement and disengagement of the groove 35 immediately before the water stop can reduce the water stop speed, thereby suppressing the generation of the water hammer.

The embodiment shown in FIGS. 11 and 12 is similar to that shown in FIG.
The lever handle 21 of the hot and cold water mixing device shown in FIG. 2 is provided with an elastic body, and the tightening cylinder 19 is provided with an uneven portion. That is,
As shown in FIG. 11, a vertical hole capable of accommodating the coil spring 31 is bored in the inner surface of the base of the lever handle 21 that covers the tightening cylinder 19, and the hard ball 32 is elastically protruded from the opening edge of the vertical hole while tightening. The outer peripheral surface of the cylinder 19 is formed in a spherical shape centered on the pin 14, and a large number of hemispherical recesses 33 are vertically and horizontally arranged on the surface thereof as shown in FIG. Therefore, in this case, if the lever handle 21 is operated vertically or horizontally, the hard ball 3
2 engages with and disengages from the hemispherical concave portion 33, and the feel is obtained by the lever handle 21.

In the tightening cylinder 19 shown in FIG. 13, three circular recessed grooves 35 are formed on the outer peripheral surface thereof, and the hard balls 32 engage with the recessed grooves 35 only when the lever handle 21 is operated up and down. The feel of engagement and disengagement is obtained only when the disengagement is performed and the flow rate is adjusted. Further, in the tightening cylinder 19 shown in FIG. 14, a large number of concave grooves 36 are radially formed on the outer peripheral surface thereof at a constant pitch, and the hard balls 32 are provided only when the lever handle 21 is rotated left and right to adjust the temperature. Can be engaged with and disengaged from the groove 36.

In the example shown in FIGS. 15 and 16, the engaging member 37 is fixedly fixed to the engaging piece 48 projecting from the upper end surface of the tightening cylinder 19, and the outer periphery of the tightening cylinder 19 of the engaging member 37 is fixed. The part that can cover the surface is made spherical and the hemispherical recess 33 is formed on the surface. As shown in FIGS. 12 and 14, the tightening cylinder 19
When the concavo-convex portion is directly formed on the product, the stop position of the tightening cylinder 19 when screwed onto the tubular upright portion 4 varies depending on the product, and therefore the position of the concavo-convex portion with which the hard ball 32 engages and disengages. There is an inconvenience that the value does not become constant, but in FIGS.
If the engaging member 37, which is a separate member, is fixed to this as shown in FIG. 7, the position of the concave-convex portion, that is, the hemispherical concave portion 33 becomes constant, so that the embodiment shown in FIGS. Similarly to the above, the feeling of engagement and disengagement can call attention to the discharge of high-temperature hot water.

17 and 18, the lever handle 2 is shown.
17 shows another embodiment of the elastic body provided in FIG. 1, and in FIG. 17, a leaf spring-shaped elastic piece 38 is fixed to the inner surface of the lever handle 21 and its tip 39 is the hemispherical concave portion 33 or the concave groove 3.
5. The groove 36 and the like are elastically pressed to engage and disengage. In FIG. 18, the elastic piece 40 is integrally formed on a part of the lever handle 21 to further simplify the configuration.

In yet another embodiment shown in FIGS. 19 to 29, elastic member engagement / disengagement means is provided between the pressing body 13 which is rotated by the operation of the lever handle 21 and the case body 7 which is not rotated. It is a thing. That is, in the example shown in FIGS. 19 and 20, the hard sphere 32 is elastically held by the coil spring 31 on the inner surface of the case body 7 relative to the holding body 13, and the holding body 13 rotates with the rotation of the hard sphere 32. Hemispherical recesses 33 that allow 32 to engage and disengage are formed at regular intervals.
Further, in the example of FIG. 21, a ring 41 made of elastic metal as shown in FIG.
While the elastic piece 42 is formed in a part of 1, the inner surface of the case body 7 is radially formed with a plurality of concave grooves 34 into which the elastic piece 42 can be engaged and disengaged as shown in FIG. . Further, in the example of FIG. 24, the elastic piece 42 is integrally formed on the inner periphery of the upper end opening edge of the case body 7 as shown in FIG. 25, while the elastic piece 42 is formed on the upper outer peripheral surface of the holding body 13 as shown in FIG. A large number of concave grooves 34 are formed at regular intervals. Further, in the example shown in FIG. 27, the ring 41 shown in FIG. 28 is clamped and fixed between the case body 7 and the tightening cylinder 19, and the elastic piece 42 integrally formed with the ring 41 is shown in FIG. As described above, the hemispherical concave portion 33 formed on the upper end surface of the pressing body 13 can be engaged and disengaged. In any of these embodiments, the lever handle 21 is operated to the left and right to rotate the pressing body 13 to adjust the temperature, whereby the elastic body such as the hard ball 32 and the elastic piece 42 becomes the hemispherical concave portion 33, the concave groove 34, or the like. A feeling of engaging and disengaging the uneven portion can be obtained.

Further, the embodiment shown in FIGS.
An engaging piece 48 is formed on the upper end surface of the presser body 13 and a ring 41 as shown in FIG. 32 is fixed thereto. An elastic piece 42 is integrally formed on the ring 41, and the inner circumference of the tightening cylinder 19 is formed. A concave groove 34 is vertically formed on the surface, and in this case as well, the elastic piece 42 is engaged with and disengaged from the concave groove 34 by the rotation of the ring 41 and the elastic piece 42 with the rotation of the pressing body 13 during temperature adjustment. To do.

In the hot and cold water mixing apparatus shown in FIG. 33, a handle cap 43 is attached to the upper end of the cylindrical upright portion 4 so as to be rotatable in a horizontal plane, and a vertically long portion formed on a part of the handle cap 43. The lever handle 21 is projected to the outside through the hole 44. In such a hot and cold water mixing apparatus, the hard ball 32 is elastically projected by the coil spring 31 on the inner surface of the handle cap 43 and is supported by the lever. As shown in FIG. 34, a plurality of recessed grooves 36 are formed in the handle 21 at regular intervals, and the hard balls 32 can be engaged with and disengaged from the recessed grooves 36 when the lever handle 21 is operated up and down.

Further, in the hot and cold water mixing apparatus shown in FIG. 35, a hard ball 32 is elastically projected by a coil spring 31 at a portion of the handle cap 43 facing the tightening tube 19, and the hard ball 32 is attached to the tightening tube 19. A large number of hemispherical recesses 33 that engage and disengage are arranged on the circumference, and in this case, the feel of engagement and disengagement can be obtained when the lever handle 21 is operated left and right to adjust the temperature.

Further, the hot and cold water mixing apparatus shown in FIG. 36 is such that a relative engagement between the movable valve 12 and the pressing body 13 provides a feeling of engagement and disengagement when operating the lever handle 21 up and down. In this case, the hemispherical recess 33, which is fixed to the upper surface of the movable valve 12, has the coil spring 31 arranged on the disc cap 45 to support the hard ball 32 and engage and disengage the hard ball 32.
Are arranged on the lower surface of the presser body 13.

In the embodiment shown in FIGS. 37 to 40, the pressing body 13 obtained when the lever handle 21 is operated up and down.
In order to obtain a feeling of engagement and disengagement by the relative movement of the connecting rod 15, the elastic piece 42 is integrally formed on the outer periphery of the connecting rod 15 in FIG. 37, and the connecting rod 15 rotates. A groove 36 is formed on the inner surface of the pressing body 13 with which the elastic piece 42 comes into contact with the movement. Further, in FIG. 38, the hard sphere 32 is elastically projected on the inner surface of the pressing body 13 by the coil spring 31, and the groove 36 is formed on the outer periphery of the connecting rod 15. Further, in FIG. 39, a horizontal through hole 46 is provided in the connecting rod 15, a coil spring 31 is provided in the horizontal through hole 46, and a pair of hard balls 32 are provided so as to project from both ends of the horizontal through hole 46 due to elasticity of the coil spring 31. As shown in FIG. 40, a hemispherical recess 33 for engaging and disengaging the hard sphere 32 is formed on the inner surface of the pressing body 13, and these are all used when the lever handle 21 is operated up and down to adjust the flow rate. To work.

In the embodiment shown in FIG. 41, the feeling of engagement and disengagement is obtained by the rotational movement of the pressing body 13 with respect to the case body 7 and the forward / backward movement of the movable valve 12 with respect to the pressing body 13. Upper and lower through holes 47 are formed in the body 13, a coil spring 31 is provided in the through hole 47, and a pair of hard balls 32 is provided so as to project from both ends of the through hole 47 by the elasticity of the coil spring 31. Recessed grooves 36 are formed on the inner peripheral surface of the case body 7 and the upper surface of the disk cap 45 of the movable valve 12, which are in contact with each other. According to this embodiment, the feel of engagement and disengagement can be obtained when the lever handle 21 is operated up and down to adjust the flow rate and when it is operated left and right to adjust the temperature.

Similar to FIG. 41, FIG. 42 also shows a structure in which a feeling of engagement and disengagement can be obtained during both operations. In this case, the coil spring 3 is used.
1, the hard balls 32 elastically projecting from the inner peripheral surface of the pressing body 13 are engaged with and disengaged from the recessed grooves 34 formed on the outer peripheral surface of the connecting rod 15, and the same coil spring 31 elastically elastically presses the outer peripheral surface of the pressing body 13. The hard sphere 32 protruding toward the front is configured to be engaged with and disengaged from the recessed groove 34 formed in the inner peripheral surface of the case body 7.

Although a number of embodiments have been described above, in the present invention, the shape of the concavo-convex portion with which the elastic body engages and disengages is not a hemispherical concave portion or concave groove as in the embodiment but a convex portion or a convex groove. Of course, it is okay. Further, the uneven portion may be provided in a plurality of one or more places, and may be provided on both sides so that a feeling of engagement / disengagement can be obtained during both the flow rate adjustment and the temperature adjustment, or may be provided on only one of them. Good. And, in order to give a larger feeling of engagement and disengagement in order to obtain a larger feeling of engagement and disengagement when the lever handle is operated so that the temperature of the mixed water becomes high, the pitch of the concave and convex portions in each of the above embodiments or the The size of the undulations can be set as desired. Further, in each of the above-mentioned embodiments, the water hammer can be prevented by forming the uneven portion that engages and disengages immediately before the mixed water stops.

[0031]

As described above, according to the hot and cold water mixing apparatus of the present invention, since the feel of the lever handle can be obtained by the engagement and disengagement of the elastic body with respect to the concave and convex portion, the flow rate and the temperature can be adjusted, and the desired flow rate or temperature can be adjusted. The setting becomes easy, and it becomes easy to adjust only the flow rate or only the temperature, which greatly improves the usability. Further, depending on the shape of the uneven portion, it is possible to alert the hot water discharge and improve the safety, or to prevent the movement of the water hammer from fully open to fully closed in a short time and prevent the occurrence of a water hammer. Has the effect of.

[Brief description of drawings]

FIG. 1 is a plan view of a hot and cold water mixing device.

FIG. 2 is a vertical cross section of the hot and cold water mixing device.

3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a vertical sectional view of a fixed valve and a movable valve.

FIG. 5 is a plan view of a fixed valve.

FIG. 6 is a plan view of a fixed valve.

FIG. 7 is a plan view of a fixed valve.

FIG. 8 is a plan view of a fixed valve.

FIG. 9 is a plan view of a fixed valve.

FIG. 10 is a plan view of a fixed valve.

FIG. 11 is a vertical cross-sectional view of a main part of the hot and cold water mixing device.

FIG. 12 is a side view of the tightening cylinder.

FIG. 13 is a side view of the tightening cylinder.

FIG. 14 is a side view of the tightening cylinder.

FIG. 15 is a vertical cross-sectional view of a main part of the hot and cold water mixing device.

16 is a right side view of FIG.

FIG. 17 is a partial vertical sectional view of a lever handle.

FIG. 18 is a partial vertical sectional view of a lever handle.

FIG. 19 is a vertical cross-sectional view of a main part of the hot and cold water mixing device.

FIG. 20 is a perspective view of a presser body.

FIG. 21 is a vertical cross-sectional view of a main part of the hot and cold water mixing device.

22 is a bottom view of the case body of FIG. 21. FIG.

23 is a perspective view of the ring of FIG. 21. FIG.

FIG. 24 is a vertical cross-sectional view of a main part of the hot and cold water mixing device.

FIG. 25 is a perspective view of the case body of FIG. 24.

FIG. 26 is a perspective view of the pressing body of FIG. 24.

FIG. 27 is a vertical cross-sectional view of a main part of the hot and cold water mixing device.

28 is a perspective view of the ring of FIG. 27. FIG.

29 is a perspective view of the pressing body of FIG. 27. FIG.

FIG. 30 is a vertical cross-sectional view of a main part of the hot and cold water mixing device.

31 is a perspective view of the tightening cylinder of FIG. 30. FIG.

32 is a perspective view of the ring of FIG. 30. FIG.

FIG. 33 is a vertical cross-sectional view of a main part of the hot and cold water mixing device.

34 is a perspective view of a main part of the lever handle of FIG. 33. FIG.

FIG. 35 is a vertical cross-sectional view of a main part of the hot and cold water mixing device.

FIG. 36 is a vertical cross-sectional view of the main part of the hot and cold water mixing device.

FIG. 37 is a vertical cross-sectional view of a main part of the hot and cold water mixing device.

FIG. 38 is a vertical cross-sectional view of a main part of the hot and cold water mixing device.

FIG. 39 is a vertical cross-sectional view of the main part of the hot and cold water mixing device.

FIG. 40 is a vertical sectional view taken along the line of the pressing body in FIG. 39;

FIG. 41 is a vertical cross-sectional view of a main part of the hot and cold water mixing device.

FIG. 42 is a vertical cross-sectional view of a main part of the hot and cold water mixing device.

[Explanation of symbols]

 1 Device Main Body 2 Hot Water Supply Pipe 3 Water Supply Pipe 4 Cylindrical Stand 6 Mixing Valve Assembly 7 Case Body 9 Hot Water Valve Port 10 Water Valve Port 11 Fixed Valve 12 Movable Valve 18 Sliding Ring 21 Lever Handle 31 Coil Spring 32 Hard Ball 33 Hemisphere Recessed portion 34 Recessed groove 35 Recessed groove 36 Recessed groove 38 Elastic piece 40 Elastic piece 42 Elastic piece

Claims (3)

[Claims] 1. A single lever handle is operated up and down, and left and right to move a movable valve forward and backward and rotate on a fixed valve, so that the opening areas of the hot water valve port and the water valve port opened in the fixed valve are controlled. In a hot and cold water mixing device that controls the flow rate and temperature of the mixed water by adjusting it, the elastic part is integrated with either the movable part that is linked to the operation of the lever handle or the fixed part that does not move when the lever handle is operated. A hot and cold water mixing device, characterized in that a body is provided and a concavo-convex portion is formed on the other side to engage and disengage the elastic body by operating a lever handle. 2. The uneven portion in which the elastic body engages and disengages is formed with a small pitch or a large undulation as the temperature of the mixed water is controlled to be high by operating the lever handle. Hot water mixing device described. 3. The hot and cold water mixing apparatus according to claim 1 or 2, wherein an uneven portion is formed so that the elastic body engages and disengages when at least the flow rate is controlled to a small amount by operating the lever handle.