JPH0365988B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a breast pump used for expressing breast milk, and more particularly to a pressure adjustment mechanism for creating a negative pressure inside a bottle for storing breast milk.

BACKGROUND OF THE INVENTION Breast pumps equipped with electric suction devices are becoming popular. However, the above-mentioned breast pumps have drawbacks such as uniform suction action and unilateral expression of breast milk, which places too much strain on the breasts and causes discomfort to the mother's body.

For this reason, the present applicant has already developed a breast pump capable of finely adjusting the suction pressure in Utility Application No. 59-141247
No. 54844]. Hereinafter, the above-mentioned breast pump will be explained with reference to FIGS. 14 to 22.
FIG. 14 is an overall perspective view of the breast pump, and FIG. 15 is an enlarged longitudinal sectional front view of FIG. 14 with a portion cut away.

The breast pump consists of a bottle A that stores expressed breast milk,
It has a structure in which a milking part B that presses against the breast and an electric suction part C that creates a negative pressure inside the bottle A are vertically connected.

The milking section B includes a substantially cylindrical base 1 and the base 1.
a body part 2 horizontally installed integrally on the upper part of the body part 2;
It consists of a wrapper-shaped cup part 3 that expands from the tip. The lower part of the base 1 of the milking part B is a lower connecting part 1a, which is screwed into the upper part of the bottle A. Further, the upper part of the base 1 is an upper connecting part 1b, and the electric suction part C is attached to this upper connecting part 1b.
Fit the bottom of the. Further, an adapter 4 for reducing the diameter of the trunk 2 is detachably provided at the boundary between the trunk 2 and the cup 3 of the milking section B. The adapter 4 improves the suction force by making close contact with the areola, and is used to correct small nipples, inverted nipples, and flat nipples.

The electric suction part C includes a main body 5 that fits into the upper connecting part 1b, and an upper lid 6 that fits into the upper part of the main body 5.
and a mounting body 7 housed inside the main body 5.
A motor 8 and a battery 9, which are electrically connected by a thin cord (not shown), are seated on the mounting body 7.
A crank pin 8a is attached to the motor 8, and a battery 9 is attached to the motor 8.
can be replaced by removing the top cover 6 from the main body 5. The main body 5 is made by abutting two cases 5a and 5b that are divided in the vertical direction, and in FIG. 15, a vertical hole is bored in the center of the left case 5a, and a sliding type The switch 10 is screwed together from the inside with a screw 10a. A horizontal hole 5c is bored in the main body 5 below the switch 10 and near the upper connecting part 1b of the milking part B, and a pressure adjustment mechanism D is provided.

An exploded longitudinal sectional front view of the pressure adjustment mechanism D is shown in FIG. 16 and will be described. Hereinafter, in the figure, the right side will be referred to as the inside, and the left side will be referred to as the outside. Pressure adjustment mechanism D
An outside air introduction hole 7a is formed in the lower part of the mounting body 7 and coaxially with the horizontal hole 5c, and this outside air introduction hole 7
Configure by inserting the following eight parts into a. side,
From the inside, there are eight parts: a compression coil spring 11, a valve rod 12, a packing 13, a valve seat 14, a pressure release button shaft 15, a pressure adjustment screw 16, a pressure adjustment knob 17, and a pressure release button pusher 18. A female thread 7b with a reverse thread is threaded into the outside air introduction hole 7a. Reverse male threads 14a and 16a are threaded on the inner peripheries of the valve seat 14 and the pressure adjustment screw 16, respectively. Outside air introduction hole 7
The male threads 14a and 16a of the valve seat 14 and the pressure adjustment screw 16 are screwed into the female thread 7b of a. The valve stem 12 and the packing 13 are integrally fitted, and the outside air introduction hole 7a
Store inside. Then, the compression coil spring 11 urges the valve stem 12 outward, and the gasket 13 presses against the valve seat 1.
Closely attached to 4. FIG. 17 shows a cross-sectional view of the pressure adjustment screw 16 taken along the line X-X, and the Y-
A Y-line cross-sectional view is shown in FIG. As shown in both figures, the pressure adjustment screw 16 and the pressure adjustment knob 17 are splines 16b, 17a [described as "row knurling" in Japanese Utility Model Application No. 61-54844].
are formed and integrated by fitting. A cross-sectional view of this fitted and integrated state, including the pressure release button shaft portion 15, is shown in FIG. In the same figure, 5d is the horizontal hole 5c.
This is a stopper protruding from the case 5a at the upper edge of the case. A locking piece 17b is formed inside the pressure adjustment knob 17, and this locking piece 17b is connected to the stopper 5d.
By blocking the pressure adjustment knob 17, the rotation of the pressure adjustment knob 17 is restricted to within approximately 360 degrees.

A negative pressure inducing portion E is formed inside the mounting body 7 of the pressure adjustment mechanism D, and an exploded sectional view thereof is shown in FIG. 16 as well. The negative pressure generating portion E is constituted by the mounting body 7, the diaphragm 19, and the cap 20. Mounting body 7
A right side view of the diaphragm 19 is shown in FIG. 20, a left side view of the diaphragm 19 is shown in FIG. 21, and a left side view of the cap 20 is shown in FIG. The diaphragm 19 is a vibrating section 19 that projects outward to form a suction chamber 19a.
b, and the intake valve 19c and exhaust valve 1 facing each other at 90 degrees.
9d, and a bushing portion 19e that protrudes outward from the vibrating portion 19b and fits into a crank pin 8a attached to the motor 8. The suction valve 19c opens only inward, and the exhaust valve 19d opens only outward. The mounting body 7 is provided with a fitting hole 7c corresponding to the vibrating part 19b, and the suction valve 19c and the exhaust valve 1 are connected to each other.
Suction hole 7d and exhaust hole 7e correspond to position 9d.
There is a hole. The cap 20 also has a recess 19 corresponding to the recess 19a of the diaphragm 19.
Convex portion 20a having a diameter slightly smaller than the inner diameter of a
are provided protrudingly, and first and second narrow grooves 20b and 20c are carved corresponding to the suction hole 7d and exhaust hole 7e.

The outside air introduction hole 7a and the suction hole 7d of the mounting body 7 are as follows.
It communicates with the lower end of the suction section C through the air suction hole 7f. However, the filter 2 is installed in the air suction hole 7f.
1 is inserted to prevent milk from flowing into the suction section C.

In FIG. 15, a fitting ring 22 is fitted into the lower end 5e of the main body 5 of the suction section C, and the upper connecting section 1b of the milking section B is elastically connected to the lower end 5e of the main body 5 of the suction section C so as to be detachably connected thereto.
Further, a small diameter 1c of a milking part is bored on the lower side of the upper connecting part 1b, and a guide ring 1d is provided below, surrounding this small hole 1c. With guide ring 1d,
To prevent milk from being directly sucked into the small hole 1c of the milking part. Lower connecting part 1a of milking part B and bottle A
An annular packing 23 is interposed between the two to bring A and B into close contact with each other.

The breast pump capable of finely adjusting the suction pressure is constructed as described above, and its operation will be explained next.

First, place the cup 3 of the suction part B firmly against the breast and slide the switch 10 to turn on the power. Then, the crank pin 8a attached to the motor 8 rotates eccentrically. Then, the diaphragm 19 fitted with the crank pin 8a vibrates, and the air inside the bottle A is sucked from the small hole 1c of the milking section through the filter 21 to the air suction hole 7f of the suction section C. It becomes negative pressure. Therefore, breast milk is expressed in the milking section B, passes through the trunk 2 of the sucking section B and the guide ring 1d, falls into the bottle A, and accumulates therein.

In this case, if the pressure adjustment knob 17 fitted with the pressure adjustment screw 16 is turned counterclockwise, the seal 13 fitted on the valve stem 12 and the valve seat 14 will be separated from each other, and the outside air will be brought into the side hole 5c. The air then flows into the air intake hole 7f. Therefore, the suction pressure inside the bottle A decreases, and the milking force and suction force also decrease, resulting in gentle milking. Conversely, when the pressure adjustment knob 17 fitted with the pressure adjustment screw 16 is turned clockwise, the valve stem 12
The gasket 13 and valve seat 14 that are fitted together are closed, and outside air does not flow into the air intake hole 7f. Therefore, the inside of the bottle A becomes the maximum negative pressure, and the milk is strongly sucked from the sucking part B. In this manner, the suction pressure can be changed precisely by changing the degree to which the pressure adjustment knob 17 is turned.

Furthermore, even if the seal 13 fitted to the valve stem 12 and the valve seat 14 are in a closed state, the seal 13 fitted to the valve stem 12 and the valve seat 14 can be removed by simply pressing the pressure release button pusher 18. By pressing the pressure release button pusher 18, outside air is introduced from the side hole 5c into the air suction hole 7f, thereby reducing the suction pressure. Therefore,
Due to the intermittent pressing operation of the pressure release button pressing part 18,
By giving appropriate stimulation to the nipple, it can produce a milking effect similar to the sucking action of a baby.

Moreover, since the pressure adjustment knob 17 and the pressure release button pusher 18 are installed on the lower side of the suction section C, the suction pressure can be adjusted with one hand, and the other hand can be used around the outer circumference of the breast. It can be used to massage or help with milking.

Problems to be Solved by the Invention In order to be able to precisely change the suction pressure, the pressure adjustment mechanism D is composed of a total of 11 parts including the mounting body 7 and the negative pressure generating part E. be. If the number of parts is large, it takes time and effort to manufacture the parts. Therefore, an object of the present invention is to reduce the number of parts of the pressure adjustment mechanism D and the negative pressure generating part E to seven parts.

Means for Solving the Problems In order to achieve the above object, the present invention provides a bottle for storing expressed breast milk, a milking part to be pressed against the breast, a pressure adjustment mechanism for creating negative pressure in the bottle, and a negative pressure inducing mechanism. A breast pump in which a suction part and a suction part housed in a hollow main body are vertically connected, and the pressure adjustment mechanism and the negative pressure generating part are connected to a mounting body having a horizontal outside air introduction hole formed in the lower part; A valve stem with a tapered surface that expands in diameter inward, a compression spring that biases the valve stem outward, a diaphragm with a valve seat at the bottom, a vibrating section at the middle, and a diaphragm at the bottom that has a valve seat and a vibration section in the middle. It consists of a cap with an outside air introduction hole and a concave part in the middle, a pressure release button with a cam surface, and a pressure adjustment knob with a protrusion on the inside of the cylindrical body. A horizontal hole is formed, an outside air introduction hole at the bottom of the mounting body is arranged coaxially with the horizontal hole, the compression coil spring is housed inside the outside air introduction hole, and the above compression coil spring is housed outside the outside air introduction hole. The valve stem is housed, the valve stem is urged outward, the diaphragm and the cap are joined together to form an intake chamber between the vibrating part of the diaphragm and the concave part of the cap, and the valve seat part of the diaphragm and the cap are connected. The outside air inlet hole of the main body is arranged coaxially with the horizontal hole of the main body, and the valve stem protrudes through it, and the pressure adjustment knob into which the pressure release button is fitted is engaged with the horizontal hole of the main body, and the protrusion of the pressure adjustment knob is The cam surface of the pressure release button is in contact with the pressure release button, and the pressure release button is in contact with the tip of the valve stem.

Effect: With the above solution, the intake chamber between the diaphragm and the cap functions like a pump, making it possible to create negative pressure inside the bolt. In addition, by rotating the pressure adjustment knob, the pressure release button with a cam surface moves back and forth, and the valve stem that is in contact with the pressure release button and the valve seat of the diaphragm are intermittently separated. . When the pressure release button is pressed intermittently, the valve stem and the valve seat are intermittently separated from each other. When the valve stem and the valve seat are spaced apart, outside air is introduced into the bolt, and the negative pressure inside the bottle is reduced.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 13.

FIG. 1 is a longitudinal sectional front view of the entire upper part of the bolt A, the base of the milking part B, and the suction part C.

The suction section C includes a main body 25, a top lid 26 that fits into the main body 25, and a mounting body 27 that is housed inside the main body 25.
It consists of A motor 8 and a battery 9 are mounted on the mounting body 27.
Both 8 and 9 are electrically connected by an elongated copper plate 28. However, the copper plate 28 is provided with one movable contact 28a. The motor 8 has
Attach the crank pin 8a and insert the battery 9 into the upper cover 26.
It can be replaced by removing it from the main body 25. The main body 25 is made up of two vertically divided cases 25a and 25b that abut each other, which is different from the conventional case, and a notch is formed in the upper and middle portions of one of the abutting sides. A light emitting diode 29 is inserted into the upper notch to notify the state of battery 9 consumption. A sliding switch 30 is disposed in the notch in the middle. Since the switch 30 is disposed in a notch in the case 25a, there is no need to screw it in from the inside as in the conventional case. Below the switch 30 and near the upper connecting part 31b of the milking part B, a horizontal hole 25b is bored in the main body 25, and a pressure adjustment mechanism D and a negative pressure inducing part E are provided.

An exploded longitudinal sectional front view of the pressure adjustment mechanism D and the negative pressure generating section E is shown in FIG. Hereinafter, in the figure, the right side will be referred to as the inside, and the left side will be referred to as the outside. Pressure adjustment mechanism D
and negative pressure inducing part E are equipped with the following six parts on the outside of the mounting body 27. That is, from the inside, there are six parts: a compression coil spring 41, a valve rod 42, a diaphragm 43, a cap 44, a pressure release button 45, and a pressure adjustment knob 46. Therefore, the total number of parts of the pressure adjustment mechanism D and the negative pressure generating part E is 7 including the mounting body.
It becomes a part.

A left side view of the mounting body 27 is shown in FIG. 3, and will be explained in conjunction with FIG. 2. A vertical air suction hole 27a is formed in the lower part of the mounting body 27. Further, a horizontal hole 25 of the main body 25 is located in the middle part of the air intake hole 27a.
An outside air introduction hole 27b with a stepped portion is bored outwardly coaxially with the hole 27b. Above this outside air introduction hole 27b,
A suction hole 27c is formed to penetrate from the outer surface of the mounting body 27 to the air suction hole 27a. A fitting hole 27d having a circular side surface shape is bored in the middle portion of the mounting body 27.

The compression coil spring 41 is connected to the outside air introduction hole 27b.
It fits in and stops at the step.

The valve stem 42 has an inner portion formed with a tapered surface 42a that expands in diameter into a conical shape, and an outer portion formed with a spline 42b having a cross-shaped side cross section, and its Z-Z
A line cross-sectional view is shown in FIG.

A left side view of the diaphragm 43 is shown in FIG.
This will be explained in conjunction with FIG. The middle part of the diaphragm 43 forms a circular vibrating part 43a that protrudes inward, and the protruding vibrating part 43a
7 into the fitting hole 27d. A bushing part 43b is made to protrude further inward from the center of the vibrating part 43a, and is fitted into a crank pin 8a attached to the motor 8. Therefore, due to the rotation of the motor 8, the crank pin 8a rotates eccentrically, and the bushing portion 43b
The vibration section 43a vibrates by moving back and forth. The lower end portion of the diaphragm 43 forms a valve seat portion 43c coaxial with the horizontal hole 25b of the main body 25, and brings the tapered surface 42a of the valve rod 42 urged by the compression coil spring 41 into close contact. The diaphragm 43 is an elastic body, and the valve stem 42 and the valve seat 4 do not need to be fitted with a gasket as in the conventional case.
3c is in close contact in a steady state. Therefore,
By integrally molding the valve seat 43c on the diaphragm 43, the valve stem 12 and seal 1 can be removed from the conventional valve stem 12 and seal 1.
3 and 3 can be manufactured separately and the work of assembling can be eliminated.
Vibrating portion 43a and valve seat portion 43c of diaphragm 43
A suction valve 43d, which is a check valve that can open outward, is formed between the two. A discharge valve 43e, which is a check valve that can open inward, is formed above the vibrating portion 43a of the diaphragm 43.

A right side view of the cap 44 is shown in FIG.
This will be explained along with the diagram. A convex portion 44a is formed inside the central portion of the cap 44 to fit into the vibrating portion 43a of the diaphragm 43 with a gap. Convex portion 4
The center portion of the diaphragm 4a is recessed into a mortar shape to form an intake chamber 44b between the vibrating portion 43a of the diaphragm 43 and the vibrating portion 43a. The first narrow groove 44 extends downward from the intake chamber 44b.
c is carved, and a second narrow groove 44d is carved upward from the intake chamber 44b. An outside air introduction hole 4 coaxial with the horizontal hole 25b of the main body 25 is located below the first narrow groove 44c.
4e and pass the valve stem 42 through it. By joining the cap 44 and the attachment body 27, the periphery of the outside air introduction hole 44e fixes the valve seat portion 43c of the diaphragm 43 to the outside air introduction hole 27b of the attachment body 27. Therefore, this breast pump does not require the troublesome assembly work of manufacturing the valve seat 14 with the conventional male thread 7b carved therein and then engaging the valve seat 14 with the female thread 7b of the mounting body 7. becomes unnecessary. An exhaust hole 44f is bored above the second narrow groove 44d.

A plan view of the pressure release button 45 is shown in FIG. 7, and a right side view is shown in FIG. 8, which will be explained in conjunction with FIG. 2. A collar is fixed to the pressure release button 45 to form a cam surface 45a as shown in FIG. Furthermore, as shown in FIG.
The pressure release button 45 is fitted with claws (not shown) protruding from both sides of the pressure release button 45, so that the pressure release button 45 can only be moved back and forth without being rotated. In addition, a recess 45c is provided in the center.
is formed, and the valve rod 42 is brought into contact with this recessed portion 45c.

A right side view of the pressure adjustment knob 46 is shown in FIG. 9, and will be explained in conjunction with FIG. 2. The pressure adjustment knob 46 has a flange 46a around its outer end surface,
Pressure release button 45 is prevented from being biased outwardly. Inside the pressure adjustment knob 46, there is a horizontal hole 25 of the main body 25.
The collar 4 fits into the narrow groove carved in the protrusion 25c of b.
6c is installed internally. The pressure release button 45 is housed in the pressure adjustment knob 46, the pressure adjustment knob 46 and the protrusion of the horizontal hole 25b are elastically deformed, and the collar 46c of the pressure adjustment knob 46 is carved into the protrusion 25c of the horizontal hole 25b. Fit into the narrow groove. Then, the pressure release button 45 is housed within the pressure adjustment knob 46 and does not come off from the main body. Therefore, the present pressure release button 45 eliminates the troublesome work of fitting the pressure adjustment screw 16 with the spline 16b into the pressure adjustment knob 17 and integrating the pressure adjustment screw 16 as in the prior art. Pressure adjustment knob 4
A protrusion 46b is provided at one location inside the flange 46a of 6.
This protrusion 46b forms the pressure release button 45.
Press the cam surface 45a of. , pressure adjustment knob 4
6, the protrusion 46b also rotates, and the protrusion 46b presses the cam surface 45a of the pressure release button 45. Therefore, when the pressure adjustment knob 46 is rotated clockwise, the protrusion 46b presses the cam surface 45a of the pressure release button 45.
a to the side concave inward, move the pressure release button 45 outward, and urge the valve stem 42 outward.

Next, referring to FIG. 1, the fitting portion between the suction section C and the milking section B will be explained.

Main body 25 of suction section C housing pressure adjustment mechanism D
The lower end portion of the milking portion B is removably fitted into the upper connecting portion 31b of the milking portion B. The upper connecting portion 31b is provided with an outer annular projection 31c and an inner annular projection 31d, and a small hole 31e is formed in the center of the inner annular projection 31d.
to be drilled. The outer annular projection 31c is elastically connected to the elastic body 32 fitted to the lower end of the main body 25. The check valve 33 is fitted into the inner annular projection 31d from above. The check valve 33 includes a cylindrical body 33a made of synthetic resin and a ball 33b inserted into the cylindrical body 33a. The upper surface of the cylindrical body 33a has a concave surface 33a ₁ in close contact with 33b, and the lower end has four protrusions 33a ₂ protruding from it, and the ball 33b is attached to the concave surface 3.
_3a1 and the protrusion _33a2 . That is, in a steady state, the ball 33b is supported by the convex strip _33a2 , and air flows through the small hole 31e of the milking section B.
The air flows from the air to the air suction hole 27a of the attachment body 27 of the suction section C. Further, when the breast pump falls over, the ball 33b comes into close contact with the concave surface _33a1 , and prevents the milk stored in the bottle A from flowing into the suction section C.

The milking section B has a lower connecting section 31a screwed onto the upper part of the bottle A, and a dome-shaped cup 34 is interposed between the upper end opening of the bottle A and the milking section B. The cup 34 has a flange 34a around the top opening, and the flange 34a is placed on the top opening of the bottle A. The brim 34a has, for example, four intake holes 34b in contact with the side surfaces of the cup 34 to suck the air inside the bottle A. A through hole 34c is formed in the reduced diameter portion of the lower end of the cup 34 so that expressed breast milk drips into the bottle A. The reason why such a dome-shaped cup 34 is installed is that when the breast pump falls over, milking is stopped at once by the check valve 3.
This is to prevent it from going to step 3. Cup 34
By replacing the material with rubber, soft plastic, etc., the packing 23 used in the past can be omitted.

The check valve 33 and the cup 34 have already been disclosed by the present applicant in Japanese Patent Application No. 1988-88524.

The breast pump according to this embodiment is constructed as described above. Next, the operation will be explained as shown in FIGS.
This will be explained with reference to the drawings. 10 to 13 are assembled longitudinal sectional front views of the pressure adjustment mechanism D and the negative pressure generating section E. FIG.

First, the operation of creating a negative pressure inside the bottle A will be explained with reference to FIGS. 10 and 11. switch 30
When the motor 8 is turned on and the motor 8 is rotated, the crank pin 8a attached to the motor 8 rotates eccentrically. Then, the vibrating part 43a of the diaphragm 43 moves back and forth, and the air intake chamber 44 formed between the diaphragm 43 and the cap 44
b expands and contracts continuously. As shown in Figure 10,
When the suction chamber 44b expands, the pressure within the suction chamber 44b decreases. Then, the air in the bolt A flows through the through hole 34c of the cup 34, the small hole 31e of the milking part B, the check valve 33, the air suction hole 27a, and the suction hole 27c, and the suction valve 43d opens, and the first The air flows into the intake chamber 44b through the narrow groove 44c. At this time, the exhaust valve 43e is biased by suction pressure in the direction of closing the second narrow groove 44d, so outside air does not flow into the intake chamber 44b from the exhaust hole 44f. In addition, in a steady state, the valve stem 42 is biased by the compression coil spring 41, and the tapered surface 42a of the valve stem 42 and the valve seat 43c of the diaphragm 43 are in close contact with each other, so that outside air flows in through the outside air introduction hole 27b. There's nothing to do.

Next, as shown in FIG. 11, when the intake chamber 44b contracts, the discharge valve 43e opens, and the air from the bottle A that has flowed into the intake chamber 44b is discharged from the second narrow groove 44d to the discharge hole. 44f and is released to the outside. At this time, since the suction valve 43d does not open due to pressurization, the air that has flowed into the suction chamber 44b does not flow out from the suction hole 27c.

In this way, the intake chamber 44 functions as a pump.
By expanding and contracting the volume of the bottle A, the air in the bottle A is sequentially sucked into the intake chamber 44b and discharged from the exhaust hole 44f. Then, the inside of the bottle A becomes negative pressure, and the breast that is in close contact with the cup part 3 of the milking part B is sucked, and milk can be expressed.

If the milking force is too strong, the milking force can be weakened by rotating the pressure adjustment knob 46 counterclockwise, as shown in FIG. A projection 46b is provided inside the pressure adjustment knob 46, and this projection 46b presses the cam surface 45a of the pressure release button 45. When the pressure adjustment knob 46 is rotated counterclockwise, the protrusion 46b presses the outwardly protruding cam surface 45a. Since the pressure adjustment button 45 does not rotate and the pressure adjustment knob 46 does not move forward or backward, the protrusion 46b presses the cam surface 45a, causing the valve stem 42 that is in contact with the recess 45c of the pressure release button 45. is pressed inward against the compression force of the compression coil spring 41, and the tapered surface 42a of the valve rod 42 and the valve seat portion 43c of the diaphragm 43 are separated from each other. Then, the outside air flows through the outside air introduction hole 44e of the cap 44 and the spline 42b of the valve stem 42.
Air flows into the outside air introduction hole 27b of the attachment body 27 from between the two, and as a result, air is supplied into the bottle A. Therefore, even if the air inside the bottle A is sucked by the diaphragm 43, the outside air is introduced through the outside air introduction holes 44e and 27b, which weakens the suction pressure of the air inside the bottle A. Milking power weakens. That is, milking can be performed intermittently with a weak milking force.

It is also possible to change the milking force intermittently instead of a continuous weak milking force. In this case, the 13th
As shown in the figure, press the pressure release button 45. Then, the valve stem 42 that is in contact with the recess 45c of the pressure release button 45 moves inward against the compression force of the compression coil spring 41. Tapered surface 42 of valve stem 42
a and the valve seat portion 43c of the diaphragm 43 are separated by a large distance, and the outside air flows all at once into the air suction hole 27a of the mounting body 27 from the outside air introduction holes 44e and 27b. Then, the suction pressure inside bottle A disappears instantly, and the milking power also disappears. When the pressure release button 45 is released, the compression force of the compression coil spring 41 urges the valve stem 42 outward, and the valve stem 42 is released again.
The tapered surface 42a and the valve seat portion 4 of the diaphragm 43
3c come into close contact with each other, and the suction pressure inside bottle A increases. Therefore, due to the intermittent pressing operation of the pressure release button 45, the suction pressure inside the bottle A changes intermittently, giving appropriate stimulation to the nipple, and the baby just starts sucking. You can express milk in the same way.

Each of the above operations can be performed with one hand by installing the pressure release button 45 and pressure adjustment knob 46 on the lower side of the suction part C, while the other hand can be used to massage the outer periphery of the breast. Can help with milking.

The above describes one embodiment of the present invention, and the present invention is not limited to this embodiment.
Design changes may be made within the spirit of the invention.

Effects of the Invention According to the present invention, the number of parts for the pressure adjustment mechanism and the negative pressure generating part is reduced to about half of the conventional one, and the shape of each part is made simple, thereby reducing manufacturing costs. be able to.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of the main parts of a breast pump showing an embodiment of the present invention, Fig. 2 is an exploded longitudinal sectional front view of the negative pressure generating part of the pressure adjustment mechanism inside the breast pump, and Fig. 3 is a mounting body. Figure 4 is a vertical side view of the valve stem.
Figure 5 is a left side view of the diaphragm, Figure 6 is a right side view of the cap, Figure 7 is a top view of the pressure release button,
Fig. 8 is a right side view of the pressure release button, Fig. 9 is a right side view of the pressure adjustment knob, Figs.
The figure shows the state in which the air inside the bottle is sucked.
Figure 1 is a diagram of the state in which the sucked air is discharged, the first
FIG. 2 is a state diagram when the pressure adjustment knob is rotated to weaken the milking force, and FIG. 13 is a state diagram when the pressure release button is pressed to eliminate the milking force. 14th
The figure is an overall perspective view of the breast pump according to the earlier application, No. 1
FIG. 5 is a partially cutaway longitudinal sectional front view of the breast pump according to the earlier application, FIG. 16 is an exploded longitudinal sectional front view of the pressure adjustment mechanism and negative pressure generating part of the breast pump according to the earlier application, and FIG.
The figure is a vertical side view of the pressure adjustment screw, Figure 18 is a vertical side view of the pressure adjustment knob, Figure 19 is a vertical side view of the combined pressure adjustment screw and pressure adjustment knob, and Figure 20 is a side view of the mounting body. 21 is a left side view of the diaphragm, and FIG. 22 is a left side view of the cap. A...bottle, B...milking section, C...suction section,
D...Pressure adjustment mechanism, E...Negative pressure generating section, 27...
...Mounting body, 27b...Outside air introduction hole, 41...Compression coil spring, 42...Valve stem, 42a...Tapered surface, 43...Diaphragm, 43c...Valve seat,
44...Cap, 44b...Suction chamber, 45...
Pressure release button, 45a...cam surface, 46...pressure adjustment knob.

Claims (1)

[Scope of Claims] 1. A bottle for storing expressed breast milk, a milking part that presses against the breast, a pressure adjustment mechanism that creates negative pressure in the bottle, and a suction part that houses the negative pressure generating part in a hollow main body. In a breast pump in which the above-mentioned pressure adjustment mechanism and negative pressure generating part are connected vertically in the vertical direction, the pressure adjustment mechanism and the negative pressure generating part are connected to a mounting body having a horizontal outside air introduction hole in the lower part, and a valve having a tapered surface that expands in diameter inward. A rod, a compression coil spring that urges the valve stem outward, a diaphragm with a valve seat formed in the lower part and a vibrating part in the middle part, an outside air introduction hole formed in the lower part, and a recessed part in the middle part. It consists of a cap, a pressure release button with a cam surface, and a pressure adjustment knob with a protrusion formed on the inside of the cylindrical body. , arrange an outside air introduction hole at the lower part of the mounting body, store the compression coil spring inside the outside air introduction hole, store the valve rod outside the outside air introduction hole, and attach the valve rod outward. the diaphragm and the cap are joined together to form an intake chamber between the vibrating part of the diaphragm and the concave part of the cap, and the valve seat part of the diaphragm and the outside air introduction hole of the cap are arranged coaxially with the horizontal hole of the main body. The pressure adjusting knob into which the pressure release button is inserted is engaged with the horizontal hole of the main body, the protrusion of the pressure adjusting knob is brought into contact with the cam surface of the pressure release button, and the pressure release button is pressed. A breast pump characterized in that the tip of the valve stem is in contact with the tip of the valve stem.