Continous loop flexible lip vacuum seal

Details Continous loop flexible lip vacuum seal Continous loop flexible lip vacuum seal

1986-08-05

1989-06-06

Shoap, Allan N.

Article dispensing

With discharge assistant

Article adhering or gripping type

277 815, 277 95, 277199, B65H 308, A01C 704, F16J 1532, F16J 1534

Patent

active

048364126

ABSTRACT:
In a seed meter in which a vacuum source is coupled to the interior of a generally cylindrical housing in which a seed disk is rotatably mounted, a seal in the form of an endless loop is mounted within the housing so as to extend between an inner wall of the housing and a side surface of the seed disk so as to confine the vacuum from the vacuum source to a selected portion of the seed disk. The seal has a first portion of the length thereof extending around a major portion of a circle on the opposite side of a circumferential array of apertures in the seed disk from the axis of rotation of the seed disk and a second portion of the length thereof extending across the circumferential array of apertures and into a region adjacent the axis of rotation to isolate a seed discharge chamber on the other side of the seed disk from the vacuum source. The seal has a base portion extending along the length thereof and releasably mounted within a holder mounted on the inner wall of the housing, the base portion having ribs in the opposite sides thereof which fit into mating grooves in the side walls of the holder. The seal also has a thin lip portion along the length thereof which emanates from an edge of the base portion opposite the inner wall of the housing and which extends in a direction outwardly and away from the axis of rotation of the disk and into contact with the side surface of the disk.

REFERENCES:
patent: 3447781 (1969-06-01), Faukes
patent: 3692097 (1972-09-01), Penny
patent: 3999690 (1976-12-01), Deckler
patent: 4091964 (1978-05-01), Harrer
patent: 4105062 (1978-08-01), Bell, III et al.
patent: 4613056 (1986-09-01), Olson

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