Method of making a plastic dust boot with ridges which prevent e

Details Method of making a plastic dust boot with ridges which prevent e Method of making a plastic dust boot with ridges which prevent e

1989-12-14

1991-03-26

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264506, 264523, 264540, 425525, B29C 4902, B29C 4936

Patent

active

050027190

ABSTRACT:
A method for providing a dust-proof boot for a protruding equipment shaft of the type including a pair of spaced apart annular grooves. The boot includes an expandable central belly portion, a pair of restricted diameter attachment ring portions adapted to be received in the shaft grooves, and a pair of connecting portions connecting the attachment ring portions to the belly portion. It is formed by first forming a parison on a male die. The parison includes preformed attachment ring portions and connecting portions, at least one of which includes an inwardly protruding annular ridge member which is received in a mating recess in the die. The parison and the male die are inserted into a female blow-molding, die, with the preformed attachment ring portions and connecting portions caught and supported between the male and female dies. The belly portion of the boot is next formed by blow molding, during which step the ridge members are urged into sealing relation with wall portions of the male die grooves, thus preventing distortion of the preformed attachment ring portions.

REFERENCES:
patent: 4852891 (1989-08-01), Sugiura et al.

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