JPH0245529B2 - SUISENNIOKERUKOMAGATABENTAINOSEIZOHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a top-shaped valve body for a water faucet.

The structure of a conventional top-shaped valve body is shown in FIGS. 1 and 2. The top-shaped valve body shown in FIG.
A screw shaft b is protruded from the gasket mounting surface of the screw shaft b, and a top gasket c is fitted to the base end of the screw shaft b, and a nut d is screwed onto the screw shaft b, and the top is tightened by tightening the nut d. There is a type that is made by fixing the gasket c, but with this structure, there is a risk that the nut d may loosen due to long-term use and the top gasket c may fall off. Furthermore, the top-shaped valve body shown in Fig. 2 has a dovetail groove-like recess f formed in the top e, and a truncated conical shape having approximately the same diameter as the recess f. Groove-shaped recesses cannot be formed by forging, and must be cut by cutting, which increases processing costs and also reduces the need for piece packing.
In order to fit the piece into the recess f, the outer edge of the top packing g had to be elastically contracted so that it could be restored, and the top packing g had to be allowed to pass through the narrow entrance of the recess f. For this reason, it is difficult to assemble and is not suitable for mass production.At the same time, when it is attached to a faucet, the diameter of the piece packing G that faces the valve seat surface H is small, so it is not suitable for mass production. As shown, when the tap is opened, the outer edge i of the top block obstructs the flow of water, reducing the area through which water can pass, resulting in a correspondingly smaller amount of water flowing.

The present invention aims to solve the above-mentioned drawbacks by providing a side wall whose inner circumferential surface is at least perpendicular to the periphery of the packing attachment surface of the top stand, and connecting the side wall to the tapered surface of a mold for both press and packing molding. Manufacture of a top-shaped valve body in which a dovetail-shaped recess is formed by pressing the inside with a press, and then kneaded rubber is injected into the space formed by the recess and the mold to form a top packing. It's a method.

Examples of the present invention will be described below.

In the manufacturing process diagram using the mold shown in FIGS. 4 and 5, 1 is a top stand set vertically by loosely fitting the shaft part 4 into the vertical hole 3 of the lower mold 2. 1
A vertical side wall 6 is provided on the periphery of the packing attachment surface 5 on both the inner and outer circumferential surfaces thereof. Reference numeral 7 denotes an upper mold, and a downwardly widening tapered surface 8 is formed on the inner periphery of the lower opening edge of the upper mold so as to face the side wall 6. 9 is a cylinder formed in the upper die 7, 10 is a piston, and a kneaded rubber 11 is accommodated in the cylinder 9. 12 is a spool opened in the cylinder 9. However, when molding a lever type valve body, the lever stand 1 is set on the lower mold 2 and the lower mold 2 and the upper mold 7 are matched, and the tapered surface 8 of the upper mold 7 is used to hold the lever stand 1. The side wall 6 is pressed inward to form a dovetail-shaped recess as shown in FIG. Then, the piston 10 in the cylinder 9 is lowered and the spool 1
2, the kneaded rubber 11 is injected under pressure into the space formed by the recess and the mold and is vulcanized. Thereafter, by opening the mold, a top-shaped valve body with the top packing 13 formed in the cavity can be manufactured. FIG. 6 shows how the top-shaped valve body manufactured in this way is used in a water faucet; in this case, the side wall 6
Since it is inclined inward, a sufficient water flow area can be obtained when the valve is opened. Although the above embodiments have been explained using one mold as an example of molding a unique item, it goes without saying that productivity can be further improved if multiple items are molded simultaneously using one mold. be.

As explained above with respect to the embodiments, according to the present invention, the pressing of the dovetail groove-shaped recess and the rubber molding of the top packing can be performed simultaneously using the same mold, reducing the number of man-hours, making it suitable for mass production and reducing manufacturing costs. be done. In addition, it is advantageous because it can be used for a long period of time without damage, without the drawbacks of the screw-locking type, such as the top packing falling off.

[Brief explanation of the drawing]

Figure 1 is a partial cross-sectional side view of a conventional top-shaped valve body.
FIG. 2 is a vertical cross-sectional side view of a conventional top-shaped valve body when disassembled, and FIG. 3 is a vertical cross-sectional side view showing its usage state. 4 and 5 are manufacturing process diagrams showing one embodiment of the present invention, and FIG. 6 is a vertical cross-sectional side view showing the state in which a top-shaped valve body manufactured by this method is used. 1... Top stand, 2... Lower die, 5... Packing attachment surface, 6... Side wall, 7... Upper die, 8... Tapered surface, 11... Kneaded rubber, 12... Spool, 13...
...Koma Patsukin.

Claims (1)

[Claims] 1. A side wall with at least a perpendicular inner circumferential surface is provided protruding from the periphery of the packing attachment surface of the top stand, and the side wall is pressed inward with the tapered surface of a mold that is used for both press and packing molding, thereby forming a dovetail groove. 1. A method for manufacturing a top-shaped valve body for a water faucet, characterized in that a recess is formed, and then kneaded rubber is injected into a space formed by the recess and the mold to form a top seal.