Conmaco, Inc.

Cecil C Chappelow, Jr

Thomas J Byerley

An improved pile driving cap block cushion material is the subject of this invention. The material is a thermoplastic material characterized by being in particulate form, fiber filled (preferably glass fiber filled), having a melting point of 125.degree. C. or higher, a secant modulus of elasticity of from 50,000 to 800,000 p.s.i. and a coefficient of restitution of from 0.4 to 0.9. A number of thermoplastic materials are suitable for forming the material of the invention and include polyamides, polyesters, polyolefins, polycarbonates, polyimides, polyamide-imide copolymers, acetal homopolymers, acetal copolymers, fluoroplastics, polyphenyl oxides, copolyesters, polyetherimides, polystyrenes, polyvinyls, and polysulfones. A particularly useful group of materials is poly(ethylene terephthalate), poly(butylene terephthalate), nylon 6 and nylon 66. Additives such as antioxidants, heat stabilizers, reinforcers and colorants may also be added.

Pile driving cap block cushion assembly

An improved pile driving cap block cushion is the subject of this invention. The material is a glass filled thermoplastic characterized by a melting point of 125.degree. C. or higher, a secant modulus of elasticity of from 50,000 to 800,000 p.s.i. and a coefficient of restitution of from 0.4 to 0.9. A number of thermoplastics are suitable for forming the material of the invention and include polyamides, polyesters, polyolefins, polycarbonates, polyimides, polyamide-imide copolymers, acetal homopolymers, acetal copolymers, fluoroplastics, polyphenyl oxides, copolyesters, polyetherimides, polystyrenes, polyvinyls, and polysulfones. A particularly useful group of materials is poly(ethylene terephthalate), poly(butylene terephthalate) nylon 6 and nylon 66. Additives such as antioxidants, heat stabilizers, reinforcers and colorants may also be added.

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Johnson County, KS, United States of America

Cecil C Chappelow, Jr