Constant strain boot seal
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United States of America Patent
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-
Aug 24, 1982
Grant Date -
N/A
app pub date -
Jan 26, 1981
filing date -
Jan 26, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An elastomeric seal apparatus (16) having an inner annular terminating portion (36) which is attachable to a first (12) member, an outer annular terminating portion (38) which is attachable to a second (14) member, and an annular convoluted flexible portion (40) which is disposed between the inner (36) and outer (38) terminating portions and has an inner (46) and an outer (48) margin which are respectively joined thereto. The thickness of the convoluted flexible portion (40) decreases from the relatively thicker inner margin (46) to the relatively thinner outer margin (48) in proportion to a radial distance (H) extending from the inner margin (46) to the flexible portion (40). A concentrically inner convolution (42) and a concentrically outer convolution (44) constitute the flexible portion (40) and have a relatively small (R.sub.1) and a relatively large (R.sub.2) radius of curvature. When the inner (36) and outer (38) terminating portions are relatively reciprocated with the first ( 12) and second (14) members about a longitudinal seal axis (16a), the tapered, convoluted structure of seal apparatus (16) exhibits extended life as a result of substantially equalizing the maximum uniform strains induced therein.
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