CH214239A - Fitting for smooth pipes. - Google Patents

Description

Fitting for smooth pipes. The subject of the present invention is a coupling for Biss pipes which is characterized in that it comprises a hollow body having at least one chamber, in which the end of a pipe engages, and in that it comprises a threaded plug through which said pipe passes longitudinally with an appreciable clearance and which is screwed into the entrance to the chamber, so that its end compresses very strongly in this chamber a deformable annular member surrounding the end of the chamber. pipe! and which, under the effect of this Pressure, strongly encloses the first pipe, thus ensuring a solid connection and Channel between this pipe and the first Body.

The single figure of the appended drawing shows, by way of example, a partial axial section of one embodiment of the coupling which is the subject of the present invention.

The fitting represented comprises a body 1 provided with a hexagonal 2, inside the ducluel there is practiced a chamber comprising a threaded part 3, a smooth cylindrical part 4 following the part 3, of diameter at most equal to the internal diameter of the thread of Part 3, and a Part 5, of smaller diameter than Part 4 and constituting a stop Gage for the free end of a pipe 6 to be connected, in copper, by example. The end of the pipe 6 engages, in fact, with only a small clearance, in the part 5 and flat against a shoulder 7 constituting the bottom of this Part.

In the example shown, it is assumed that Body 1 is symmetrical in shape and serves to connect pipe 6 to another pipe 6'. Boobs. the means realizing the connection between the first pipe 6 and the first body 1 have been represented.

Part 5 of the chamber of the Body 1 has a flare 8 facilitating the insertion of the end of the pipe 6 into Bette Part 5. Another advantage of this flare will be indicated later.

When it comes to connecting the pipe 6 to the Body 1, one begins by threading the free end of this pipe through an axial passage of a threaded plug 9, provided with a six-step head. 10. The diameter of the Passage in question is somewhat larger than that of the pipe 6, so as to leave an appreciable clearance in 11.

This done, a deformable member is placed around the end of the pipe 6, of diameter substantially equal to that of Part 4, and the end of the pipe 6 is introduced into the body 1, so that it abuts against the shoulder 7. This done, an viese the first threaded plug 9 in Part 3, so that its end very strongly compresses the deformable organ, represented at 12 in the first drawing, so that, under the effect of this Pressure, said mauere tightly encloses the first pipe, thus ensuring a solid and tight connection between this pipe and the first body 1.

The aforesaid deformable member may comprise graphite asbestos, consisting of mats or circular braids formed of long asbestos fibers, and a mixture of natural rubber and neoprene (artificial rubber), all calibrated hot in precision steel moulds.

Due to the play existing at 11, there is absolutely no risk of the pipe 6 twisting as a result of the twisting of the latter by the screwing of the cap 9.

A flare is provided at 13 and 14, at both ends of the axial passage of the plug 9. The flare 13 facilitates the introduction of the pipe, while the flare 14, likewise the flare 8, has the effect of , increase the contact surface between the deformable member and the pipe.

It will be noted that the wall of the cliam # ber is lined over the greater part of its length in contact with the deformable member, when the 1st bnuchon is in the position of work represented, on the 1st drawing. In fact, the deformable member is only in contact with one or two Barde threads of the thread 3, when the plug 9 is screwed on fully. Good watertightness is thus ensured.

The coupling could of course be provided to connect, not two pipes, one to the other, but, for example, a vessel or a tap to a pipe. It could also include a spring washer, arranged between the deformable member and the plug forming the stuffing box, so as to compress this material.

The coupling described avoids the following disadvantages of certain known couplings: Breakage of flanges as a result of the need for excessive tightening intended to secure the joint, and this particularly in the types of tapered flanges; weakening and work hardening of the lining in type A fittings, overturned flanges or flat RTIID="0002.0274" WI="10" HE="4" LX="1141" LY="643"> fittings, loosening of fittings after the circulation of hot water through them as a result of the twisting of the pipe during assembly, as a result of the collar being dragged by the serrab coupling; bottoming of the flanges on the bottom, which prevents a perfect joint, mainly in the type of fittings with internal cone; considerable waste of time and use of gspécial macherres for the confeetion of conical or flat flanges; Difficulty of fittings with olives to ensure a perfect seal despite excessive tightening if the pipes have a defect of flattening, however slight it may be.

The coupling described does not, in fact, have any collars, which eliminates all the disadvantages inherent in the presence of these. It has been noted, on the other hand, that torsion of the pipe is excluded. In addition, an easily understands (read Fon obtains without difficulty, by screwing the cap 9, a tightening @nergic by compression of the deformed organ) the, and consequently a perfect 6taneh6ite.

It should also be noted that the connection described can be disassembled without difficulty and without risk of damage.

Due to the presence of clearance 11, bad heat conductor 12, and clearance 8, the metal tube 6 is in contact with the fitting on only a very small area (corresponding to a small fraction of the length of the pipe engaged in the first fitting), so that a good thermal insulation is thus ensured between this pipe, on the other hand, and the first body 1 and the first plug 9, on the other hand, which is an advantage , in the hot water pipes.

Claims (6)

CLAIM Fitting for smooth pipes, characterized in that it comprises a hollow body having at least one chamber, into which the end of a pipe engages, and in that it comprises a threaded plug which the said pipe crosses longitudinally with an appreciable play and which is screwed into the inlet of the chamber, so that its end very strongly compresses in this chamber a deformable annular member surrounding the end of the pipe and which, under the effect of this pressure, encloses strongly the first pipe thus ensuring: if a solid and tight connection between this pipe and the first body. SUB-CLAIMS 1. Coupling according to claim, characterized in that the wall of the chamber is lined for the greater part of its length in contact with the deformable member, when the plug is in the working position. 2. Coupling according to claim, characterized in that the axial channel presented by the threaded plug, for passage of the pipe, is flared at least at that of its ends which is in contact with the deformable member. 3. Coupling, according to claim 1, characterized in that the aforesaid chamber comprises, going from the outside to the inside, a threaded part in which the first plug is screwed, a smooth part of diameter at most : equal to the inside diameter of the threaded part, and a straighter part, has at least one ballast portion of diameter equal to that of the pipe, to the nearest clearance. 4. Raceord according to claim and sub-claim 3, characterized in that an event is provided at the entrance of said right side. 5. Coupling according to claim and sub-claims 3 and 4, characterized in that, thanks to the presence of the clearance between the first plug and the pipe, the aforesaid flare and the organ def orm@able, which is made of a poor heat-conducting material, the first pipe is in contact with the first fitting only over a small fraction of its length engaged in the first fitting, in order to ensure good thermal insulation between this pipe and 1st raecord. 6. Coupling according to claim, characterized in that the deformable member consists of a material comprising graphite asbestos.