Stock material or miscellaneous articles – Hollow or container type article
Patent
1990-02-01
1991-04-09
Ryan, Patrick J.
Stock material or miscellaneous articles
Hollow or container type article
428 351, 428174, 428213, 428219, 428480, 403 50, 403223, 285225, 285235, 74 18, 74 181, 1281211, 1281251, B29D 2200
Patent
active
050063766
ABSTRACT:
A molded joint boot obtained by using a highly hard and highly elastic thermoplastic polyester elastomer as the molding material. The molded boot is formed into the shape of a conical bellows having a major-diameter portion connected to a minor-diameter portion by a tapered wave-like portion. Along the direction from the major-diameter portion to the minor-diameter portion, the ratio of the outside diameter of the crest portion on the minor-diameter side of a given wave to the outside diameter of the immediately-preceding trough portion of the same wave is confined within the range of about 1.08 to about 1.40. The subject molded boot is processed by injection molding, and the thermoplastic polyester elastomer employed as the molding material is above about 70 kg/cm.sup.2 in tensile yield strength, above about 30% in tensile yield elongation, and within the range of about 430 kg/cm.sup.2 to about 1700 kg/cm.sup.2 in tensile elasticity modulus. The molded boot thus obtained is of longer service life without experiencing deformational anomalies, such as buckling, even when subjected to pronounced bending during operational use.
REFERENCES:
patent: 3033046 (1962-05-01), Rodda
patent: 3700297 (1972-10-01), Fickenwirth et al.
patent: 4424834 (1984-01-01), Sumi et al.
patent: 4522081 (1985-06-01), Mackin et al.
Arima Yoshihiro
Kazushige Nishida
Otuka Soiti
Ryan Patrick J.
Toyo Tire and Rubber Co. Ltd.
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