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US 4,198,037 AGranted
Method of making polyester elastomer compression spring and resulting product
AssigneeMiner Enterprises, Inc.
InventorDavid G. Anderson
Life of this patent
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AssigneeMiner Enterprises, Inc.
InventorDavid G. Anderson
Estimating the term…
A preform is made by casting a copolyester polymer elastomer into a block. While the block is solidifying, pressure is supplied to the central portion thereof. After a block is formed, it is annealed and a precompression force is applied thereto sufficient to compress the block to an extent greater than thirty percent of the original dimension of the block as measured parallel to the precompression force. In one embodiment a cushioning unit using the block is made by placing a pair of multi-apertured metal plates on opposite sides of the block with projections on the plates extending against the block and applying a second precompression force to the block and plates sufficient to cause the copolyester polymer elastomer to flow into the apertures in the plates and form a mechanical bond between the block and the plates.
A method of processing a block of a copolyester polymer elastomer of a given axial length to form a compression spring which spring when subsequently put into service as such will not suffer significant permanent deformation although a particular force is applied axially thereto which force is capable of compressing the spring by an amount greater than that which would normally result in a permanent deformation of its axial length, said method comprising the steps of:
A method of making a compression unit comprising an elastomeric spring having two sides, and two plates each having a face abutting and bonded to a respective one of said sides, said method comprising the steps of:
Dependencies are inferred from the claim text.