USRE14077E - Pipe-joint - Google Patents

Description

' UNITED STATES PATENT oEEIoE. i

CHESTER P.

IIALL, or LOMBARD, ILLINOIS, AssIGNoR, BY MESNE ASSIGNMENTS, To

J. W. MGFERILAN, or CANTON, oIIIo.

PIPE-JOINT.

Specification. of Reissued Letters Patent. Reissued Feb, 29, 1916 riginal No. 1,030,237, dated .Tune 18, 1912, SeriaI No. 540,798. Application'for reissueled'luly 23, 1913.

Serial No. 780,793.

To all whom t may concern.'

Be it known that I, CHESTER P. HALL, a citizen of the United States, residing at Lombard, in the county of Dupage and State of Illinois, have invented certain new and useful Improvements in Pipe-Joints, of which the following is a specification.

My invention relates to improvements in pipe joints and primarily to devices of then character described for joining adjacent ends of electrical-conduit tubing or pipe,

although it-may be employed in connection.`

with any form of conduit.

' One of the objects of my linvention is to provide a joint that will firmly and strongly hold the adjacent ends of the conduit pipe without the necessity of decreasing the internal diameter thereof. v

Other objects of my invention are, the provision of a joint that may be readily and quickly vapplied without removing the protecting enamel from the surface of the pipe where the pipe will be 'exposed to the oxidizing influence of the atmosphere; and the provision of a joint that may, when necessary, be used on pipe having threads or grooves cut in the exterior surface of the ends, and which will cover and protectthe threads thereof from the destructive effectsof the atmosphere; the provision of a ring or Sleeve which may be manufactured `with a minimum of expense and applied with a minimum of attention, and which, when applied, shall develop a biting rib or engaging portion which shall renderl ,the joint eX- tremely tight and secure; while further objects and advantages will become apparent as the description proceeds.

Generally speaking `my invention may be defined as consisting of the constructions and combinations recited in the claims hereto annexed and illustrated in one embodiment, in the drawings accompanying and forming a part of this application, wherein: Figure 1 is a longitudinal section showing the joint applied to the ends of two adjacent pipes, showing one joint completed and the other ready to be tightened up; Fig. 2 is a' cross sectional view taken on line 2 2 of Fig. 1; and Fig. 3 is a longitudinal section showing one side of the double joint, or single joint, used to connect a conduit pipe t0 a' junction or outlet box.

In Vall of the views, the same reference characters Indicate simllar parts.

A fitting 5, as shown in Fig. 1, is eX- `teriorly screw-threaded at both ends, as at 6 and 7. It is slightly tapered inwardly at both ends, as at 8 and 9 and may, if desired, be provided wlth an lnterior shoulder 10,

forming an abutment against which the ends of the respective pipes are presented. The

ends of the fitting are provided with the interiorly 'threaded caps 13, 14, each of which is formed with a central bore of a Size to receive snugly the pipe `to be used therelwit ring or sleeve 15, preferably mafde of ay relatively soft malleable metal, such as yellow brass, White metal, or the like, and having a substantially smooth cylindricalbore of a diameter to receive snugly the pipe. l-The forward end o each ring preferably presents a comparatively thin edge 16 formed ters of the tapered portions 8, 9.

In case the pipes to be joined are of hard metal the same are preferably scarfed'with a plurality of grooves cut into the pipe, as at Y18. This can be conveniently and quickly done by means of one turn of a pipe cutter.

The threaded caps, 13 and 14, and tapered rings 15 lare first placed on the respective ends of the pipe or conduit, the ends ofthe pipe are then scarfed by means of a suitable cutter, as shown, and said ends are then introduced in the respective tapered ends of the sleeve and the caps are screwed on to the respective ends of the sleeve. In

Upon the end of each pipe is positioned a i the case of pipes of softer metal thisadvance scarfing can, of course, be omitted,y

the rings, being merely located upon tlie p ipe ends and forced into place. The tightening of the caps on the ends of the 4fitting causes a powerful inward pressure to be exerted upon the ribs 17, causing them to be reduced and pressed down toward .the conicalv surface of the ring or sleeve. At' thesame time, the interior vof the sleeve will be bulged inwardly, so as tolill the scarfs 18' asV shown at lthe right hand side of Fig. 1, .or so as to bite Ainto the surface of the pipe in case thesame be of soft metal. In any casethe rib which was originally upon the exterior of the ring or sleeve is transferred by the pressure to the interior of the same and become interlocked with the pipe, rendering the joint impervious to fluids and safe from accidental separation.

For the purpose of conveniently rotating the sleeve and caps, I provide wings, as shown at 19, on the peripheral surface and use an ordinary spannerl wrenchfor engagement therewith. Of course, these surfaces can be made smooth and a pipe wrench employed to turn the said caps or they ma be l .provided with plural flat parallel sur aces between the pipe `and the fitting tends to contract the ring and to expand the fitting, thereby making'water-ti'ght joints between these'parts, forcin parts o-fthe rings into the scarfs cut on t e pipe, .and Ieffecting a more intimate contact between the cap and the end'of .the fitting, thereby to more firmly hold the cap in place.

into intimate contact with'the exterior of The circumferential enlargement near the i i' smallest tapered end of the ring or sleeve is an essential part of the invention, as by this means, portions of the rings are forced the pipe. As already explained' the same laction takes place lwhether the scarfs are annular and endless asy when made'- by a cutting tool, or helical as ywhen made by althread-cutting die, or even when the exterior of the pipe isosmooth, provided the proper relative hardness'of pipe andi` sleeve be chosen. It will be understood, however, that the particular shape and construction of the tting and the particular arrangement of parts whereby inward pressure is brought to bear upon the rib may be varied widely without departing from the scope of my invention. Accordingly, while I have described my vinvention in detail'I do notl propose to limit myself to such details except as the same may be positively recited in the claims -hereto .annexed or may be rendered necessary by the prior state of the art. y

Having thus described an embodiment of my invention, what I claim is:

l. In a pipejoint, the combination, with vthe taper o groove for reception of a `sharp thread of the purpose described.

a pipe having a normally non-threaded end, of a fitting to receive the pipe end, said fitting exteriorly threaded and interiorly tapered near its end, aring of soft malleable metal adapted to surround the pipe and tapered for coaction with the tapered' portion of said fitting upon the application of pressure thereto to hold the pipe, and a cap threaded for engagement with said fitting and for forcing said tapered ring into contact therewith, said pipey having cut therein at ap roximately the inner edge of said fitting a sharp edged said ring to be. forced thereintoupon operation of said. threaded cap.

2. In a pipe joint, the combination with a ipe, having a normally non-threaded end,

o a fitting to receive the pipe end, said fitting exteriorly threaded and interiorly tapered near its dend, an interior shoulder against Iwhich the pipe end abuts, a ring of soft malleable metal surrounding the pipe' and tapered bythe application of pressure theretoto wedge between said tapered portion of 'the fitting and pipe, and a cap threaded for engagement with said fitting and forcing said tapered. ring into contact therewith said pipe having cuttherein a groove adjacent the small edge of said tapered ring for reception of the extreme edge of said tapered malleable ring forced thereinto upon operation of said cap.

3. In a` pipe joint, the combination of4 a pipe end havlng made therein (as by a single turn of a pipe cutter) a sharp edged groove at a suitable distance from the end thereof, a fitting adapted to receive said pipe end providing a shoulder to receive in contact therewith the `end of said pipe,

the interior surface of said fitting providing a flaring portion extending outwardly from said groove in the pipe end and the exterior surface of said sleeve being screw-threaded, an interiorly screw-threaded cap for engagement with said screw threads of the. sleeve,

andy a wedge ring of soft malleable metal tapering to provide on one side a-pointed annular edge, said wedge ring lying with its pointed edge within thetapering space between the sleeve and pipe end, said ring being by turning of the cap, forcibly wedged into said space, and the pointed edge 4lying 1n the groove' of said pipe 4. In a pipe joint, the combinationwith a pipe yendhaving a groove therein and a non-threaded portion adjacent said groove, of a vfitting providing an interior Surface for coaction along the outer surface of the overlie said non-threaded portion, whereby there is included between said flaring sup face of the fitting and said' non-threaded portion of the pipe an inwardly tapering end as, and for.

.125 pipe, and a `surface flaring outwardly to space said space ending substantially at the groove insaid pipe, a ring of malleable metal,y and a cap adapted to be moved toward said ring to press the latter into said tapering space and groove, as described.

5. In a pipe joint, they combination, with a pipe end having a groove therein and a non-threaded portion adjacent said groove, of a fitting providing an interior surface for coaction along the outer surface of the pipe end, and a surface flaring outwardly to overlie saidnon-threaded portion, whereby there is included between said flaring surface of the fitting and non-threaded portion of the pipe an inwardly tapering space said space ending substantially at the groove in said pipe, a ring of malleablemetal tapering toward one side to provide a pointed annular edge and having adjacent itsVedge an enlargement, and a cap adapted tobe moved toward said ring to press the latter into said tapering space between the fitting and pipe and to press said enlargement down intosaid groove. y

6. In a pipe joint, the combination,'with a pipe end having a groove'therein, of a fitting providing an interior surface for coaction along the outer surface of the pipe and a surface flaring outwardly to provide between said flaring surface and the pipe a tapering space said space ending substantially at said groove, a tapering ring having an enlargement at its smaller end, and acap adapted to be moved against said ring to press it in to said tapering space between the fitting and pipe and to press said enlargement down into said groove, as described.

7. In a coupling for cylindrical metal members, the combination, with a hard metal fitting having at its end a flaring recess adapted to receivey one of said coupled members, of a ring or sleeve of strong ductile material adapted to fit closely about said coupled member .and having its eX- tcrior .tapered in the same direction as said recess, an integral rib surrounding said ring or sleeve adjacent to its forward end, said rib having a diamete intermediateV the largest and smallest diameters of said recess, and means whereby said ring or sleeve may be forced longitudinally into said recess, whereby said ribwill be pressed down toward. the exterior surface of said sleeve at the point opposite said rib and the interior surface of said sleeve will be beaded so .as to interlock with said' coupled member.

8. In a coupling for cylindrical metal members, the combination, with a hard metal fitting having a cylindrical portion adapted to embrace one of the members to be coupled and also having at its end a flaring-recess, of a ring or sleeve of materialV 'Y ting teriorly and the linterior of said sleeve at a taperedexterior, an integral rib surrounding said ring or sleeve adjacent to its forward end, and a cap adapted to be moved toward said ring or sleeve to press the same into said recess, whereby said rib will be pressed down toward the exterior surface.

of said ringor sleeve and the interior surface of said ring orsleeve at 'the point opposite said rib will be beaded so as to inter'- lock with said coupled member.

9. In a coupling for metal members, a sleeve adapted to surround and fit closely about such a member and having a tapered exterior surface and a circumferential rib intermediate theA ends of said surface, a fitting having a flaring interior adapted'to receive said sleeve and rib, the diameter of said rib being intermediate between the greatest and least diameters of the flaring portion 4of said fitting, and means for forcing said sleeve longitudinally into said fitwhereby said rib will be reduced eX- point opposite said rib beaded to interlock with the member therewithin.

10. In a coupling, the combination, with a fitting having a flaring recess,'of a sleeve of malleable metalhaving a cylindrical interior and a tapered exterior, said sleeve having an integral, circumferential, external rib spaced from its narrow end, an apertured member adapted to be secured to said fitting and to have a driving connection with said sleeve whereby the same can be forced into said recess and said rib transferred from the exterior to the interior of said sleeve, lthe aperture of said member being substantially in alinement with the in-l terior of said sleeve. y

11. In a coupling for cylindrical metal members, the combination, with ai sleeve having a cylindrical surface adapted to fit closely against :the cylindrical surface ofA such -member and having an annular rib projecting from the surface ^opposite to said cylindrical surface, of meansfor exerting pressure upon said rib whereby the same may be depressed in the direction of the surface from which it projects' and a bead raised-on said cylindrical surface opposite thereto which shall interlock with said coucombination, with a4 pair of tubular cou-` pling members and means for adjustably connecting them, one of said coupling members being provided with a flaring entrance end, of a Vring or sleeve of hard ductile metal tapered forwardly to a comparatively 'thin edge and having a circumferential integral rib a short distance in the rear of said edge, the normal'exterior diameter of said rib being intermediate the, largest andv smallest diameters of said entrance end, the other of said coupling members having a driving connection with said sleeve, whereby when the coupling members are drawn close together said rib will be transferred from the exterior to the interior of said sleeve and said sleeve firmly intelzrlocked with said coupled member.

1n testimony whereof, I hereunto aix my gnature in the presence. of two witnesses.

- CHESTER P. HALL. Witnesses:` v

FORE BAIN, MARY fF.' ALLEN.

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