Pipe joints or couplings – For branched path – T-type
Reexamination Certificate
1999-02-08
2001-04-24
Browne, Lynne H. (Department: 3629)
Pipe joints or couplings
For branched path
T-type
C285S133500, C285S133300
Reexamination Certificate
active
06220634
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to an improved branched hose construction.
Hoses are used commonly in motor vehicles, washing machines and other equipment wherein media such as fluids must be conveyed from one part of the device to another. Hoses are commonly made of elastomeric material and may be reinforced. It is often necessary that these hoses cooperate with other hoses and transport or distribute the fluids from each. The distribution of fluids takes place where the different hoses meet. This juncture, which often is in the form of a “T,” requires some sort of branched hose construction to enable transportation of the fluid without leakage. The fluids conveyed by the hoses are often at elevated temperatures and pressures. The working environment of the branched hose construction can also be hostile, with elevated temperatures, dirt and vibration. For these reasons, it is important that the branched hose construction maintain a degree of structural integrity to provide leakproof operation.
Recently, the appearance of the branched hose construction has become increasingly important, especially in the automotive industry for use with automotive cooling systems. Manufacturers of automobiles prefer that branched hose constructions have a clean, streamlined appearance in addition to being structurally sound and leakproof.
U.S. Pat. No. 4,648,628 to Dayco Products, Inc, discloses a branched hose construction. Clamping means are used to clamp the hoses against the respective legs of the T-connector. In addition, the legs of the T-connector are formed with annular shoulders so that the end of each hose abuts the shoulder and causes the external peripheral surface of the respective hoses to mate with and be flush with the external peripheral surface of the T-connector. In this way, an attractive appearance is obtained while the hoses are clamped against the legs of the T-connector. However, because the clamping means is located on the exterior of each hose, it remains visible and detracts from the appearance of the branched hose construction.
EPO Application 243 216 A discloses a flexible hose junction designed for use with automotive applications. A rigid “T” insert cooperates with three hoses in a manner similar to U.S. Pat. No. 4,648,628 previously discussed, except that no clamping means is utilized. Instead, hoses are held against the respective legs of the insert by an external overmolding made of a plastic material. After being molded to the branched hose construction, the overmolding material shrinks at least 1 percent and presses each hose against its respective branch of the insert. While this type branched hose construction presents an attractive, streamlined appearance, the lack of a clamping means often leads to problems with leakage and a lack of structural integrity.
U.S. Pat. No. 4,903,998 discloses a branched hose construction containing a rigid insert having at least three legs, a plurality of hoses, a securing means and a molded saddle. The saddle may be manufactured of an elastomeric material which is transfer-molded or a plastic material which can be injection-molded.
SUMMARY OF THE INVENTION
A branched hose construction according to the present invention has an insert having at least three legs. There are a plurality of hoses, the number of hoses being equal to the number of legs of the insert, with each hose having one end fitted over a leg of the insert. A molded saddle encapsulates the insert and the junctions of its legs with the hoses. The molded saddle is comprised of a unique rubber composition containing an EPDM alloy, an EPDM rubber and fibrillated aramid fibers.
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Abstract for DE 3534-620-A.
Abstract for J6 2132-638-A.
Browne Lynne H.
Dunwoody Aaron
Hendricks Bruce J
The Goodyear Tire & Rubber Company
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