US 3,978,181 AGranted

Process for making a foam plastic resin encased roller

OwnerKlaus-Heinrich Vahleinventor

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Abstract

A method of making a unitary structure, such as, a conveyor idler, having a heat-sensitive subassembly with at least one moving part therein, such as, a lifetime lubricated bearing structure, wherein the subassembly is preassembled, the preassembled subassembly is placed in a mold, and a plastic, having a sufficiently low temperature of formation to prevent damage to the heat-sensitive subassembly and, upon hardening, a sufficient compressive strength to hold the subassembly together and form a pressure resistant unitary body, such as, a hard polyurethane foam having a compressive strength of at least about 90 kp/mm.sup.2, is formed about the subassembly. A protective covering, such as, a plastic sleeve, resistant to abrasion, can also be placed in the mold and made to adhere to and surround the outside surface of the unitary plastic body during the formation of the unitary plastic body.

Claims8

Dependent claims

A method of making a foamed plastic encased idler roll comprising the steps of assembling together an assembly composed of a shaft rotatable through 360.degree., and at each end of said shaft lubricated bearing means, bearing support means, labyrinth means surrounding said shaft between said bearing means and the ends of said shaft, sealing disk means surrounding said shaft on the opposite side of said bearing means from said labyrinth means, and spacer ring means surrounding each end of said shaft adjacent said sealing disc means,

coaxially surrounding said assembly between said spacer ring means with a tubular body means to form an idler roll subassembly,
placing said subassembly coaxially within a cylindrical mold cavity to thereby define an annular space between the surface of said mold cavity and the surface of said tubular body means,
depositing a foamable thermosetting reaction mixture into said annular space,
permitting said mixture to foam and cure, and unite with said idler roll subassembly to form a foam-encased idler roll,
and removing said foam plastic-encased idler roll from said mold after said foamable mixture has cured.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/475,023Filed 31 May 1974 · division
Priority: OE 9134/7012 Oct 1970
Granted: 31 Aug 1976
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

F16C 13/02
Rolls, drums, discs, or the like ; Bearings or mountings therefor: bearings
B29C 33/0044
With sealing means or the like: for sealing off parts of inserts projecting into the mould cavity
B29C 39/10
For making articles of definite length, i.e. discrete articles: incorporating preformed parts or layers, e.g. casting around inserts or for…
B29C 39/32
Moulds or cores: with joints or the like for making the mould impervious