Piston for aerosol container
First Claim
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1. A barrier piston for an aerosol dispensing container, comprising:
- a piston head constructed to sealingly separate the aerosol container into two chambers on opposite sides of said piston;
said piston head having an annular support therearound;
an annular cylindrical collar, having a bottom end that is sealingly attached to said piston annular support;
said collar extending up from said piston annular support to a top end of said collar;
said collar having an inner surface that is spaced from said piston head, such that said collar may flex without engaging said piston head;
an annular flange sealingly attached to said collar top end and extending up from said collar;
said collar being relatively more flexible than said flange;
said flange being frusto-conically shaped, flaring outwardly, upwardly from the junction of said flange and said collar at said collar top end to a free end of said flange.
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Abstract
A piston for an aerosol container, particularly adapted for insertion through the top of the container; the piston includes an annular, cylindrical collar near its top end and a conical outwardly flaring flange atop the cylindrical collar, with the flange flaring wider toward the top of the container, whereby the flange scrapes the container interior as it moves up; the cylindrical collar is more flexible than the conical flange to ease insertion of the piston and for more effective piston sealing despite the piston cocking in the container; an anti-cocking ring are provided on the piston.
53 Citations
19 Claims
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1. A barrier piston for an aerosol dispensing container, comprising:
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a piston head constructed to sealingly separate the aerosol container into two chambers on opposite sides of said piston;
said piston head having an annular support therearound;an annular cylindrical collar, having a bottom end that is sealingly attached to said piston annular support;
said collar extending up from said piston annular support to a top end of said collar;
said collar having an inner surface that is spaced from said piston head, such that said collar may flex without engaging said piston head;an annular flange sealingly attached to said collar top end and extending up from said collar;
said collar being relatively more flexible than said flange;
said flange being frusto-conically shaped, flaring outwardly, upwardly from the junction of said flange and said collar at said collar top end to a free end of said flange. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification