JPH0127748Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drain plug that closes the drain opening of a bathtub, washstand, etc.

Conventional drain plugs of this type are made of a solid rubber stopper, and in order to seal to prevent water leakage, the rubber stopper must be firmly inserted after being fitted so that its axis does not tilt relative to the axis of the drain. It is necessary to press down, and in order to do this, for example, in the case of a bathtub, one must reach to the bottom of the bathtub and work very carefully and with concentration, which is very troublesome. Moreover, if you inadvertently insert the rubber stopper at an angle, water may leak and the rubber plug may open even if you press it hard to seal it completely, so careless work is not allowed. It is not done. Also, when removing a sealed rubber stopper, the rubber stopper is tightly fitted into the drain and water pressure is applied, so if you try to pull it up with a chain from above, the chain may break. It is also occurring well. Therefore, there is a strong desire for a drain plug that can be completely sealed by simply fitting the plug into the drain port, and which can be opened by simply pulling it up, and various proposals have been made to meet this demand. There are, but
At present, both have complicated structures and are expensive, and the above-mentioned problems have not yet been satisfactorily solved.

The object of the present invention is to provide a drain plug that can solve the problems of the conventional methods, has a simple structure, and can be manufactured at low cost.

For this reason, the present invention has a hollow rubber stopper which is opened downward and has a circumferential wall and an upper wall of a lower recess that loosely fits into the inner circumferential surface of the drain port. A flange is provided in the hollow of the rubber stopper, and a weight member is provided in the hollow of the rubber stopper, which is movable up and down and expands outward in the radial direction so that the peripheral wall of the rubber stopper comes into contact with the inner circumferential surface of the drain port by moving downward. A weight body is fitted, and a lifting shaft extending through the upper wall of the rubber plug extends from the weight body, and the lifting shaft is supported with or without a chain or the like to lift the rubber plug. By fitting the circumferential wall of the lower basin into the drain hole, and after supporting the rubber stopper on the edge of the drain hole with the brim, releasing the lifting shaft,
The weight body moves downward under its own weight, and as the weight moves downward, the peripheral wall of the rubber stopper comes into contact with the inner circumferential surface of the drain opening, closing the drain opening, and when water pressure is applied, the collar closes to the edge of the drain opening. At the same time, a downward force is applied to the weight body, so that the inner circumferential surface of the drain port and the rubber stopper surrounding wall and the rubber stopper surrounding wall and the weight come into pressure contact with each other in response to the water pressure, and a completely sealed state is obtained. When removing a drain plug, first, by pulling up the lifting shaft, only the weight body moves upward, which releases the pressure contact between the rubber plug circumferential wall and the inner peripheral surface of the drain port, and then the rubber plug and the weight are removed. To provide a drain plug that can be easily removed by simply pulling it up with a small force since the body is removed from the drain port together.

Hereinafter, one embodiment of the present invention will be described based on the drawings. Reference numeral 1 designates a bathtub, in which a drainage hole 2 is bored in the bottom wall thereof, and a drainage cap 4 having a substantially inverted L-shaped cross section is attached to the hole 2 to form a drainage port 3. The flange 4a of the drain spout 4 engages with the inner surface of the bathtub 1 via the gasket 5, and the cylindrical portion 4b extends below the bathtub 1 through the hole 2, and is screwed into a screw 6 formed on the outer circumferential surface thereof. The fitted nut 7 is engaged with the outer bottom surface of the bathtub 1 via a synthetic resin ascending plate 8 and packing 9, and the drain spout 4 clamps the bottom wall of the bathtub 1 between the flange 4a and the nut 7. The attachment is fixed by this. The flange portion 4a of the drain fitting 4 forms the upper surface of the mouth edge of the drain port 3, and the cylindrical portion 4b forms the inner circumferential surface of the drain port 3, and the upper end of this inner circumferential surface is slightly lowered. A seal seat surface 10 is formed with an inclined slope. Reference numeral 11 denotes a drain plug that seals and closes the drain port 3, and has a lower peripheral wall 14 and an upper wall 15, and a hollow portion 16 that opens downward.
It consists of a rubber stopper 12 having Through hole 1 formed at the center of wall 15
A lifting shaft 20 is provided that extends upwardly through the shaft 7 . 18 is a synthetic resin ring fixed to the upper wall 15 to reinforce the through hole 17; 19;
is a flange that protrudes from the outer periphery of the upper wall 15 and engages with the upper surface of the flange 4a of the drain spout 4. Reference numeral 21 indicates a stopper ring fitted to the lifting shaft 20 to restrict the lower limit of the downward movement of the weight body 13; 22 indicates the lifting shaft 20;
This is a lifting chain connected to the upper end of the

The outer diameter of the upper end of the peripheral wall 14 of the rubber stopper 12 is approximately the same as the inner diameter of the upper end of the drain port 3, and
As shown in Figure 2, the outer circumferential surface of the upper part of No. 4 is a conical surface with an inclination angle θ of 5° to 20° relative to the vertical line in its natural state, or its lower part is a gentle arcuate surface, and the inner circumferential surface is a gentle circular arc surface. An annular protrusion 23 with which the weight body 13 abuts is provided protruding near the lower end of the circular arc or conical surface. The inclination angle θ is smaller than the inclination angle θ' of the seal seat surface 10. On the other hand, the weight body 13 has a thick disk shape, and its outer peripheral surface is formed into a conical or arcuate surface whose diameter decreases downward. It is configured to come into contact with the inner peripheral surface of the peripheral wall 14 and the annular protrusion 23 to push the peripheral wall 14 outward in the radial direction.

In the above configuration, the drain port 3 is connected to the drain plug 11.
In the closed state, as shown in FIG. 1, the flange 19 of the rubber stopper 12 comes into contact with the upper surface of the flange 4a of the drain cap 4, and is further pressed against the water pressure, thereby achieving a sealing effect. In addition, the weight body 13 moves downward under its own weight, and the peripheral wall 14 of the rubber stopper 12 is spread outward in the radial direction and comes into contact with the seal seat surface 10 of the drain cap 4.
Further, the weight body 13 is pressed downward in accordance with the water pressure introduced from the through hole 17, and the peripheral wall 14 is pressed against the seal seat surface 10, and the peripheral wall 14 and the outer periphery of the weight body 13 are also pressed against each other. A sealing effect is obtained,
The drain port 3 is reliably sealed by the two-stage sealing effect.

When attaching or detaching the drain plug 11, as shown in FIG.
5, the peripheral wall 14 of the rubber stopper 12 becomes a natural state, and the press-fitting state between the seal seat surface 10 of the drain cap 4 and the peripheral wall 14 is released. Therefore, when removing the drain plug 11, pull up the chain 22 and remove the weight body 13.
When the rubber plug 12 and the drain cap 4 are moved upward, the fitting between the rubber stopper 12 and the drain cap 4 is released, and part of the water pressure is transferred to the through hole 17 and the hollow part 1.
6, so it is extremely light and can be removed easily. In addition, when closing the drain port 3 with the drain plug 11, suspend the drain plug 11 with the chain 22, position it approximately above the drain port 3, and lower it as it is, so that the outer periphery of the peripheral wall 14 of the rubber plug 12 is closed. The weight body 13 is guided by the downwardly converging slope and is naturally fitted concentrically, and by further moving the weight body 13 downward, a completely sealed state is obtained as described above.

As is clear from the above description, the drain plug of the present invention is a simple structure consisting of a downwardly opening hollow rubber plug having a peripheral wall and an upper wall, and a weight body fitted into the hollow part. It can be manufactured at low cost due to its configuration, and a completely sealed state can be obtained by simply suspending the lifting shaft protruding upward from the weight body, positioning the drain plug approximately above the drain opening, and then lowering it. Even when the drain plug is removed, it can be easily removed by pulling up the lifting shaft, making it extremely easy to open and close the drain port using the drain plug.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view of the drain port in a closed state, and FIG. 2 is a longitudinal sectional view of the opening/closing operation process. 3... Drain port, 11... Drain plug, 12... Rubber plug, 13... Weight body, 14... Peripheral wall, 15... Top wall, 16... Hollow part, 19... Tsuba, 20... Lifting axis.

Claims (1)

[Scope of utility model registration request] A hollow rubber stopper that opens downward and has a circumferential wall of a lower recess that loosely fits into the inner circumferential surface of the drain port and an upper wall has a collar protruding from the outer periphery of the upper wall that engages with the upper surface of the edge of the drain port. A weight body is fitted into the hollow space of the rubber plug, and is movable up and down and expands outward in the radial direction so as to bring the peripheral wall of the rubber plug into contact with the inner circumferential surface of the drain port by moving downward. A drain plug characterized in that a lifting shaft extending through the upper wall of the rubber plug extends from the weight body.