Claims
- 1. For a piston of a pump dispenser the piston having a head having a central cylindrical boss and a tubular stem terminating in a central opening in the boss, the opening having a seat and the boss being surrounded by an annular trough, an integrally formed inlet sealing valve insert molded of a resilient plastic attached to said piston head, said sealing valve insert comprising:a. a peripheral rim portion secured in the annular trough, b. a hub portion movably aligned with the seat, said hub portion including a sealing surface which selectively is disposed in a liquid-tight seal position with the seat, and c. a plurality of resilient spokes connecting the rim and the hub.
- 2. A pump dispenser as claimed in claim 1 wherein the spokes are zig-zag in configuration, each comprising an arcuate portion concentric with the axis of the insert and radial portions connecting the opposite ends of the arcuate portion to the rim and the hub respectively.
- 3. A pump dispenser as claimed in claim 1 wherein the boss has an outward rib and the rim has an inward rib and the ribs interfere with each other in snap installation of the rim in the annular trough.
- 4. A pump dispenser as claimed in claim 1 wherein the rim has an outward and upward annular fin engaging the inward facing wall.
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation of application Ser. No. 09/425,482 filed Oct. 22, 1999 now U.S. Pat. No. 6,234,361.
US Referenced Citations (10)
Continuations (1)
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Number |
Date |
Country |
Parent |
09/425482 |
Oct 1999 |
US |
Child |
09/860512 |
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US |