EP0503324A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Dispenser for flowable materials
Assignee: PACKAGE RESEARCH Corp
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Filing: 1992-02-19
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Granted: —
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Expires: 2012-02-19
Abstract
Abstract A dispenser (10) for flowable materials (34), such as toothpaste, includes a hollow barrel (12) in the form of a tube open at its lower end (18) and closed at its upper end with the flowable material being inserted in the tube. A plunger which is also in the form of a hollow tube having a closed upper end (22), is telescopically arranged in the barrel. A seal is effected by means of a hinged peripheral rim (30) on the outer surface of the piston (20) near its upper end (22). The flow of the material (34) forces the peripheral rim (30) to pivot into sealing contact with the inner surface (28) of the barrel (12).
Inventors
- 👤 Harold R. Gayle
- 👤 William T. Wilkinson
- 👤 Mario Boiardi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 07:21
CPC Classifications
A; A45; A45D; A45D40/00; A45D40/0068; A45D40/0075; B; B65; B65D; B65D83/00; B65D83/76; G; G01; G01F; G01F11/00; G01F11/02; G01F11/021; G01F11/025; A45D2200/00; A45D2200/05; A45D2200/054; A45D2200/055
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
234 words
In a dispenser for flowable materials comprising a barrel having an upper end and an open lower end, a dispensing spout at said upper end of said barrel, a plunger telescoped into said barrel, the upper end of said plunger having a piston head spaced from the inner surface of said barrel, a chamber formed between said upper end of said barrel and said upper end of said plunger whereby the flowable material may be inserted in and fill said chamber, and said barrel and said plunger being slidably mounted with respect to each other to vary the size of said chamber whereby the flowable material is caused to be discharged from said dispensing spout when said chamber is made smaller by said upper end of said barrel and said upper end of said plunger being moved toward each other, the improvement being in an annular peripheral sealing rim extending around said plunger below said piston head, said sealing rim having an outer longitudinal surface terminating in a corner at its upper edge, and said sealing rim including hinge means disposed inwardly of said outer longitudinal surface for causing said outer longitudinal surface to pivot downwardly in response to pressure from the flowable material when said chamber is made smaller to thereby create sealing surface contact of said corner and a portion of said outer longitudinal wall with said inner surface of said barrel.
Claim 2
Dependent Claim
19 words
The dispenser of Claim 1 wherein said sealing rim include a reduced thickness portion which comprises said hinge means.
Claim 3
Dependent Claim
16 words
The dispenser of Claim 2 wherein the upper surface of said sealing rim is cup shaped.
Claim 4
Dependent Claim
18 words
The dispenser of Claim 3 wherein said reduced thickness portion is at the radial center of said rim.
Claim 5
Dependent Claim
15 words
The dispenser of Claim 4 wherein the lower surface of said sealing rim is horizontal.
References Cited (Backward Citations)
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