Pipe joints or couplings – Elbow
Patent
1986-01-09
1987-07-14
Arola, Dave W.
Pipe joints or couplings
Elbow
2853341, 2853822, 285422, F16L 5500
Patent
active
046798285
DESCRIPTION:
BRIEF SUMMARY
Connecting systems in the field of pipings, pipes and conduits are known, consisting substantially of a connection in form of a sleeve serving to connect two pipe portions brought into alignment with one another. The sleeve is applied onto both facing pipe ends by means of a crimping tool. In this way, zones of the sleeve provided on the outside of the sleeve are radially crimped into the pipe ends by tool dies thereby obtaining a permanent metal to metal joint.
A connection of this type for proper functioning must have an elastic limit lower than that of the pipes to which it is crimped on.
Dismountable connecting devices implemented on fluid conduits comprising a nut (1) are also known. A connecting device of this type sometimes requires high tightening torques to provide proper sealing, under severe operative conditions (for example, high pressure, vibrations, thermal dilation, and so on), thereby leading to the selection of minimally deformable and, therefore, hard materials for the various constitutive elements of such device.
The sealing of those connecting devices is generally ensured by the contacting of a spherical, toroidal or conical male element (2) within a conical female element (3), the most currently used angles being 24.degree., 45.degree., 60.degree., 80.degree., 90.degree., (refer to FIG. 1 of the attached drawings).
The present invention is intended for providing a connecting device capable of fulfilling both the role of a malleable crimping connection and the role of a dismountable male connecting device.
However, for realizing a device of this type, one has to meet with an incompatibility caused by the fact that the hardness required for dismountable connecting is too high for the malleable connection, or that malleability required for the malleable connection leads to too high a deformation of the dismountable connection.
The present invention conciliates the required hardness and the required malleability by developing in a zone of an unthreaded connection sleeve an adventitious portion of a different nature, harder when such adventitious portion is intended for realizing a dismountable connecting male portion (the other connection portion then remaining a malleable crimping portion); more malleable when such adventitious portion is intended for realizing a crimping connection portion (the other connection portion remaining a dismountable hard connecting portion), hence two possible simultaneous functions, of dimountable connecting and of crimped connection, for one and the same accessory according to the invention.
According to the invention it is intended to develop such a harder adventitious portion on the malleable accessory, at the beginning by several processes, either metallurgical or mechanical processes.
According to one mode of manufacturing, the harder adventitious portion is produced by localized machining hardening.
According to another mode of realization the harder adventitious portion is produced by adding a part thereto such that the malleable sleeve may form a continuous assembly with the added member.
According to the invention, it is intended to develop such a more malleable adventitious portion, on the accessory, which is hard at the beginning, through localized overquenching, which lowers the elastic limit in the zone of the accessory which is then considered.
Other characteristics and advantages of the present invention will appear from the following description which is made with reference to the attached drawings on which:
FIG. 1 represents a cross-section through a dismountable connecting device with a nut of the known type;
FIG. 2 represents in a half-cross-sectional view an accessory according to the invention to show a malleable portion as required for the crimped connecting and a harder adventitious portion as required for the intended dismountable connecting;
FIG. 3 is a half cross-sectional view of an accessory according to the invention in which a hard adventitious portion is associated with a malleable crimping portion;
FIG. 4 is a half cross-sectio
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Arola Dave W.
Permaswage S.A.
LandOfFree
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