JP2003226383A - Tilt type valve for aerosol container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tilt type valve for an aerosol container capable of assuring a stable tilting action by a leaf spring integrally formed by synthetic resin. <P>SOLUTION: An annular seat groove 15 for seating an inner circumferential part of an annular stem gasket 5 is formed at an outer circumferential surface of a stem 10 so as to seal a stem hole 12. As the stem 10 is operated to tilt, a clearance is generated between a flat annular seat surface 16a below the seat groove 15 and a rear surface of the stem gasket 5 to enable the stored substances fed into a housing 3 to be discharged out through a stem hole 12. A bottom surface 16b of a stem base end section 16 forming the seat surface 16a at its upper surface is formed in a tapered shape where its outer diameter is gradually decreased toward the base end. A plurality of leaf springs 18 are integrally formed facing toward the leading end at a circumferential position with the center line in a longitudinal direction of the stem 10 at the bottom surface of the housing 3 so as to cause the extremity end 18a to be abutted against the bottom surface 16b. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin housing held in a mounting cup for mounting an aerosol container, and a stem mounted in a state of being elastically biased forward. An annular seat groove for receiving the inner peripheral portion of the annular stem gasket is formed on the outer peripheral surface of the stem so as to seal the stem hole, and the stem is tilted. When operated, a gap is created between the flat annular seating surface below the seating groove and the backside of the stem gasket, so that the contents introduced into the housing can be discharged through the stem hole. It relates to a type valve. 2. Description of the Related Art In a tilt valve of this type, a stem hole is tilted with an end of a seating surface abutting against a back surface of a stem gasket as a fulcrum by tilting a stem in an upwardly biased state by a coil spring. By opening it, it is possible to inject with a lighter operating force than a normal push-down type. On the other hand, according to Japanese Utility Model Application Laid-Open No. 5-61082, a coil springless push-down type valve in which a plurality of leaf springs are integrally formed at a base end portion of a stem and a distal end thereof is pressed against a bottom surface of the housing is disclosed. It has been disclosed. [0003] However, when such a stem with a leaf spring is used in a tilt valve, the leaf spring on the side opposite to the tilting operation is lifted to obtain a sufficient spring force. There is a possibility that the leaf spring on the side of the tilting operation expands and interferes with the peripheral surface of the housing. SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a tilt valve for an aerosol container which can guarantee a stable and stable tilting operation with a leaf spring integrally formed of a synthetic resin. . According to the present invention, in order to achieve this object, according to claim 1, a stem made of a synthetic resin housing held by a mounting cup for mounting an aerosol container has a stem, An annular seat that is housed so as to protrude from the stem insertion opening of the mounting cup in an elastically biased state toward the front and seats the inner peripheral portion of the annular stem gasket on the outer peripheral surface of the stem so as to seal the stem hole. A groove is formed, and when the stem is tilted, a gap is created between the flat annular seating surface below the seating groove and the back surface of the stem gasket, so that the content introduced into the housing passes through the stem hole. In the tiltable valve for aerosol container that can be discharged, the bottom surface of the stem base end portion, which forms the lower seating surface of the seat groove on the upper surface, moves to the base end side It is formed in a tapered shape that gradually reduces the outer diameter toward it, so that the tip end abuts on this tapered bottom surface,
A plurality of leaf springs are integrally formed toward the front at a circumferential position around the longitudinal center line of the stem on the bottom surface of the housing. When the stem is tilted, the leaf spring expands while sliding while the distal end of the leaf spring is in elastic contact with the tapered bottom surface of the base end of the stem. As a result, a gap is created between the seating surface below the seating groove and the back surface of the stem gasket, and the stem hole is opened. When the tilting operation is released, the leaf springs return to the normal position by the elastic restoring force, and return to the normal position where the reaction force of the tapered bottom portion with respect to each leaf spring is balanced to erect the stem. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tilt type valve for an aerosol container according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. Boss 1 having stem insertion port 1c of mounting cup 1 mounted on top of aerosol container
1A, a housing 3 made of a synthetic resin for constituting an injection valve having a stem 10 is held on the outer periphery thereof by uneven engagement. At the base end of the housing 3, an inlet 4 to which the dip tube 6 is connected is formed. The stem 10 has a pipe portion 14 protruding from the stem insertion opening 1c, and an outer peripheral portion of an annular rubber stem gasket 5 is held between the distal end portion of the housing 3 and the upper surface rear surface of the mounting cup 1. ing. The inner peripheral portion is seated in an annular seating groove 15 formed on the outer peripheral surface of the stem 10. The upper surface of the disc-shaped stem base end portion 16 on the base end side forms a flat annular seating surface 16a below the seating groove 15. Seat groove 15
The upper wall surface 15a is positioned forward of the stem insertion port 1c so as to form a gap for tilting the stem 10 around the stem insertion port 1c. The bottom surface 16b of the stem proximal portion 16 is formed in an inverted conical tapered shape whose outer diameter gradually decreases toward the proximal end. The outer diameter of the stem base portion 16 is
The inclination of the housing 3 is set on the peripheral surface of the housing 3. On the other hand, on the bottom surface 3a of the cylindrical housing 3, a plurality of, for example, four plates of the same length at 90 ° intervals are provided at circumferential positions surrounding the disk-shaped protrusion 16c around the longitudinal center line A of the stem 10. The spring 18 is integrally formed forward so that the distal end portion 18a contacts the bottom surface portion 16b. The operation of the tilt valve for an aerosol container constructed as described above is as follows. Under normal conditions,
The stem gasket 5 is seated in the seat groove 15 and the seat surface 16
The stem hole 12 along the seating surface is sealed by being in contact with a. The contents of the container are press-fitted into the housing 3 from the dip tube 6 via the inlet 4. When the stem 10 is tilted in any direction, for example, in the direction of the stem hole 12 shown in FIG. 2, the stem 10 is tilted with the end of the seating surface 16a on the side opposite to the tilting operation as a fulcrum. A gap is formed on the surface side of the stem gasket 5,
The vicinity of the stem hole 12 is opened by the injection pressure, and the contents flow into the stem hole 12 to perform the injection. With respect to the tilting operation in all directions other than the illustrated direction, the air flows into the stem hole 12 via the narrow gap generated by the injection pressure along the periphery of the stem 10 on the back surface of the stem gasket 5. At the time of such tilting, the tip end portion 18a of the leaf spring 18 extending upward is in elastic contact with the tapered bottom surface portion 16b of the stem base end portion 16, and the tilting operation side is pushed from above, and the anti-tilting operation side Is pushed outward and slides and expands. When the tilting operation is released, the leaf spring 18 is tapered toward the normal position by the elastic restoring force toward the normal position.
To return to the normal position where the reaction force of the tapered bottom surface portion 16b against each of the leaf springs 18 that stand upright in parallel at the same circumferential position is balanced and the stem 10 is erected. I do. According to the first aspect of the present invention, the upwardly formed leaf spring elastically contacts the tapered bottom portion of the stem base end portion when the tilting operation is performed. Thus, a coil spring-less tilt valve capable of stably biasing the stem forward without interference with the peripheral housing peripheral surface or each other is realized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a tilt type valve for an aerosol container according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the valve during a tilting operation. [Description of Signs] 1 Mounting cup 1c Stem insertion port 3 Housing 3a Bottom part of housing 5 Stem gasket 10 Stem 12 Stem hole 15 Seating groove 16a Seating surface 16b Bottom part 18 of stem base end part 18 Plate spring

Claims (1)

Claims: 1. A synthetic resin housing held by a mounting cup for mounting an aerosol container so that a stem projects from a stem insertion opening of the mounting cup in an elastically biased state toward the front. Along with being housed, an annular seating groove for seating the inner peripheral portion of the annular stem gasket is formed on the outer peripheral surface of the stem so as to seal the stem hole, and when the stem is tilted, the lower seating groove is formed. In a tilt valve for an aerosol container in which a gap is formed between a flat annular seating surface and a back surface of a stem gasket, contents introduced into a housing can be discharged through a stem hole. The bottom surface of the stem base end portion, which forms the seating surface on the upper surface, is formed in a tapered shape that gradually reduces the outer diameter toward the base end side. So that the tip part abuts on the bottom part of
A tilt valve for an aerosol container, wherein a plurality of leaf springs are integrally formed toward the front at a circumferential position on the bottom surface of the housing about a longitudinal center line of the stem.