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US 5,413,147 AGranted
Flexible hose and fitting assembly
AssigneeParker-Hannifin Corporation
InventorsLuis Moreiras, Frederick J. Davis, Issac Shilad
Life of this patent
Estimating the term…
Abstract
A fluid conveying hose, especially a refrigerant conveying hose, that exhibits improved resistance to permeation of the refrigerant while still affording desirable flexibility, and a fitting for such hose and methods of making the hose and the union between the hose and fitting. Also provided is a coupling assembly for a hose and a service fitting that is a considerably less expensive alternative to existing assemblies equipped with relatively expensive shut-off valves or quick connect/disconnect couplers.
Claims16
A flexible hose comprising
- an inner corrugated tube of polymeric material impervious to the fluid to be conveyed through the hose, said tube having alternating radially outer ridges and radially outwardly opening grooves axially staggered in relation to alternating radially inner ridges and radially inwardly opening grooves;
- an intermediate layer of elastomeric rubber material surrounding said inner corrugated tube and supported on said radially outer ridges;
- a braided layer of fiber reinforcement material on said intermediate layer;
- and
- an outer layer of elastomeric rubber material surrounding said braided layer of fiber reinforcement;
- and
- wherein said intermediate layer penetrates partway into said radially outwardly opening grooves with a void being left at a lower region of said radially outwardly opening grooves.
4 more elements
An assembly comprising a flexible hose and fitting;
- said flexible hose including
- an inner corrugated tube of polymeric material impervious to the fluid to be conveyed through the hose, said tube having circumferentially extending corrugations including alternating radially outer ridges and radially outwardly opening grooves axially staggered in relation to alternating radially inner ridges and radially inwardly opening grooves;
- an intermediate layer of elastomeric rubber material surrounding said inner corrugated tube and supported on said radially outer ridges;
- a braided layer of fiber reinforcement material on said intermediate layer;
- and
- an outer layer of elastomeric rubber material surrounding said braided layer of fiber reinforcement;
- and
- said fitting including
- a nipple having an insert portion disposed in said hose, said insert portion having an axis, and
- a tubular metal sleeve crimped around said hose coextensively with said insert portion of said nipple with said nipple;
- and
- wherein said nipple includes a plurality of circumferentially extending protrusions on the outer surface thereof that are axially spaced apart at the same pitch as said radially inwardly opening grooves of said hose and have an outer diameter greater than the inner diameter of said corrugated tube at said inner ridges thereof, said protrusions being aligned with and extending into corresponding radially inwardly opening grooves of said hose, and the forwardmost one of said protrusions having at its forward end a frusto-conical ramp surface sloped at an angle of less than 30.degree. to the axis of the insert portion.
9 more elements
Dependencies are inferred from the claim text.