F - Mech Eng,Light,Heat,Weapons – 16 – J
Patent
F - Mech Eng,Light,Heat,Weapons
16
J
121/74
F16J 3/04 (2006.01) B29C 49/48 (2006.01) B29C 53/30 (2006.01) B29C 49/04 (2006.01)
Patent
CA 1158113
ABSTRACT OF THE DISCLOSURE A blow-molded bellows of a thermoplastic elasto- meric material has a generally cylindrical hollow accordion- type convolution section and ends integral therewith. The ends has axial protrusions extending outwardly from the central areas of respective ends. Each protrusion is connected to an adjacent convolution by an integral shoulder which has inwardly concave portions and outwardly convex portions. The concave portions are adjacent to the parting line, whereas the convex portions are remote from the parting line. By this feature of the bellows, the outer- most convolutions of the accordion-type convolution section of the bellows can be molded into circumferentially substantially uniform wall thickness to assure improved operability and heat-resistant property of the bellows.
379523
Fetherstonhaugh & Co.
Nihon Plast Co. Ltd.
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