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US 4,508,356 AGranted
Modified C-shaped mechanical spring seal
OwnerRobert Janianinventor
Life of this patent
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OwnerRobert Janianinventor
Estimating the term…
A mechanical spring seal comprising in combination an elastomeric jacket and a resilient spring insert having modified and matching C-shaped cross-sectional configurations. The major portion of the length of the spring follows a relatively straight path between a curved base and a position along the cross section at which the spring is widest, forming a pair of opposed cantilever arms which provide the major sealing force. From this region of greatest width to the tips of the spring, the curvature is substantially sharper, enabling the end of the spring to fit in fixed locked position within the jacket which conforms to it. At the base of the C-shaped spring, the curvature is also sharper than it is in the long cantilever arm portions. The spring receiving interior concavity in the jacket is complementary in nature to the shape of the spring, and has an open side for insertion of the spring into the jacket, the inwardly angled tips of the spring preventing its release from the jacket although the spring can also be replaced by an O-ring.
A resilient spring element for insertion in a jacket having a generally C-shaped cavity comprising:
A spring element for insertion in a jacket to form a mechanical seal, said spring element having a modified C-shaped cross section and formed of a pair of oppositely disposed cantilever arms and a curved base portion connected thereto, said cantilever arms terminating in a pair of inwardly curved tip portions, the cantilever arms of said spring element having a first relatively large radius of curvature extending from said base portion to the widest point of said spring element on opposite sides thereof, said spring element including a second radius of curvature smaller than said first radius of curvature and defined by said curved tip portions, and a third radius of curvature smaller than said first radius of curvature, and defined by said base portion.
A spring seal comprising:
A spring seal comprising in combination a spring element and a jacket of an elastomeric material receiving said spring element to form a mechanical seal, said jacket having a base and curved side arms defining a modified C-shaped interior cavity, the side arms of the jacket extending from the base along an arc having a first large radius of curvature to a point at which the jacket has a maximum selected width, the arms including converging curved tip portions from the region of maximum width having a smaller radius of curvature than the side arms;
A seal jacket receiving an internal spring element or O-ring comprising:
A spring seal comprising in combination a jacket having a base and curved side arms defining a generally C-shaped interior cross section, the side arms of the jacket extending from the base along an arc having a first large radius of curvature to a point at which the jacket has a maximum selected width, the arms including tip portions from the region of maximum width having a smaller radius of curvature;
Dependencies are inferred from the claim text.