Polymeric composite discharge chutes for concrete having a wear resistant liner
AssigneeMcNeilus Truck and Manufacturing, Inc.
InventorRonald E. Christenson
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Abstract
An improved discharge chute assembly for use with a concrete mixing truck includes improved chute components which are fabricated from a fiberglass reinforced polyurethane structural frame possessing necessary flexural and impact properties and a polyurethane liner possessing necessary wear resistance and hardness. The polymeric materials tends to remain smooth during wear and permit chutes according to the invention to be manufactured much lighter than those heretofore known.
Claims28
A discharge chute for guiding concrete dispensed from a mixing drum comprising:
- (a) a structural frame constructed from a composite of about 55 to 65 wt % polyurethane and about 35 to 45 wt % fiberglass wherein the structural frame defines a longitudinally elongated channel, and
- (b) a wear resistant liner laminated over that surface of the structural frame defining the flow-channel and having a paddle test wear resistance of at least 50% of abrasion resistant steel.
A discharge chute for guiding concrete dispensed from a mixing drum comprising:
- (a) a structural frame having a flexural strength of at least 38,000 psia wherein the structural frame defines a longitudinally elongated flow-channel, and
- (b) a wear resistant liner laminated over that surface of the structural frame defining the flow-channel which has a paddle test wear resistance of at least 100% of Abrasion Resistant steel.
Dependencies are inferred from the claim text.