Pipe joints or couplings – Nonmetal to metal – Internal member
Patent
1984-11-30
1986-02-25
Scanlan, Jr., Richard J.
Pipe joints or couplings
Nonmetal to metal
Internal member
285 93, 285420, 24205, 24271, F16L 3300
Patent
active
045725527
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a clip for sealingly connecting to a nipple, pipe stub or the like, a pipe, hose or the like, of a material with a tendency to cold flow, the clip including a constriction band, adapted to encircle the pipe, hose or the like and arranged to be tightened with a screw which is rotatably mounted in a holder.
BACKGROUND
In modern piping systems, the use of pipes made from plastics or the like, is becoming increasingly common. These materials have a tendency to cold flow, i.e. to undergo slow change in shape when they are subjected to mechanical pressure over a period of time. This causes problems concerning connection of the pipes to nipples, pipe stubs and the like, since clips known up to now were designed for pipes of elastic material such as rubber. It is thus necessary to retighten the clips at periodic intervals, if such clips are used on pipes having a cold flow tendency.
SUMMARY OF THE INVENTION
The main object of the present invention consists of providing a clip that automatically maintains a sufficient sealing pressure, in spite of cold flow in the material of the pipe.
Another object of the invention consists in providing a clip which applies to the material of the pipe a sufficiently large, immediate deformation such that an immediate seal is achieved.
A still further object of the invention consists in providing a clip that achieves a balance between the continuous pressure that the pipe material can withstand and the pressure exerted by the constriction band, such that the cold flow is restricted.
These objects are attained by the clip in accordance with the invention by the construction comprising a constriction band encircling the pipe and nipple to be connected, said band having overlapping ends adapted for displacement in relation to each other, a nut rigidly attached to one end of the band, a threaded spindle supporting said nut for travel thereon upon rotation of the spindle for displacing said one end of the band relative to the other and a resilient, U-shaped element accommodating the band and including legs straddling the band, the other end of the band being secured to one leg of said U-shaped element, said threaded spindle being mounted for rotation in the other leg of said U-shaped element, and disposed substantially in the central plane of the band.
BRIEF DESCRIPTION OF THE FIGURES OF THE DRAWING
The invention is described in detail below with reference to the accompanying drawing, in which
FIG. 1 is a side view of one embodiment of a clip in accordance with the invention,
FIG. 2 is a sectional view taken along line A--A in FIG. 1, and
FIG. 3 illustrates the clip of FIG. 1 mounted on a pipe and tightened to a predetermined pressure.
DETAILED DESCRIPTION OF A BEST MODE FOR CARRYING OUT THE INVENTION
A side view of an embodiment of a clip in accordance with the invention is shown in FIG. 1, the clip including a constriction band 1, adapted to encircle a pipe; hose or the like, not shown made from a material with a tendency to cold flow, e.g. plastics. The constriction band 1 is disposed for being tensioned by a screw or threaded spindle 2, which is rotatably mounted in a holder 3. One end of the band 1 is secured to a nut 4, adapted for travelling on the screw 2 when the screw is turned. The other end of the band is, in the illustrated embodiment, attached to one leg of a U-shaped leaf spring 5, which is clamped in the holder 3 with the aid of its legs. The U-shaped leaf spring 5 accommodates the band 1 and the legs of the spring 5 straddle the band. The screw 2 is rotatably supported in the other leg of the U-shaped leaf spring 5 and the screw 2 extends substantially in the central plane of the band 1.
In the illustrated embodiment, the end of the constriction band 1 attached to the leg of spring 5 extends through a slit 6 made in the other end of the band, in a manner illustrated in greater detail in FIG. 2.
In accordance with the invention, the clip of FIGS. 1 and 2 is provided with an indication means 7, the func
REFERENCES:
patent: 907542 (1908-12-01), Vogel
patent: 2659954 (1953-11-01), Woolsey
patent: 3765066 (1973-10-01), Nitz
patent: 3879811 (1975-04-01), Leverton
Gronberg Torsten R.
Orevik Sune A. W.
Scanlan, Jr. Richard J.
Telefonaktiebolaget L M Ericsson
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