Taper pipe joint

Claim 3

The method of claim 1, wherein said angular difference is at least two degrees.

Claim 4

The method of claim 2, wherein said first and second pipes are internally coated, and said ring fully bridges the gap between the coatings of said pipes.

Claim 5

A taper pipe joint for connecting the ends of a pair of pipe metal sections, comprising: (a) coaxially inter-engageable, inner and outer, conically-tapered, pin-and-bell end portions on the respective pipe sections; (b) the angle of taper of the inner pin-end portion being greater than the angle of taper of the outer bell-end portion, whereby the angular difference between said tapered portions defines a conical cavity therebetween; (c) the relative diameters of said pipe sections at the inner ends of said tapered end portions being such as to define a metal-to-metal interference fit between the pipe sections; and (d) an adhesive interposed in compressed relation between the inter-engaged tapered end portions, said adhesive forming a solid wall in said cavity and an annular ring at the mouth of said cavity.

Claim 6

A taper pipe joint for connecting the ends of a pair of pipe metal sections, comprising: (a) coaxially inter-engageable, inner and outer, conically-tapered, pin-and-bell end portions on the respective pipe sections; (b) the angle of taper of the inner pin-end portion being greater than the angle of taper of the outer bell-end portion, whereby the angular difference between said tapered portions defines a conical cavity therebetween; (c) the relative diameters of said pipe sections at the inner ends of said tapered end portions being such as to define a metal-to-metal interference fit between the pipe sections; and (d) an adhesive interposed in compressed relation between the inter-engaged tapered end portions, said adhesive forming a solid wall in said cavity and an annular ring at the mouth of said cavity.

Claim 7

The taper pipe joint of claim 4 wherein, said pipe sections are internally coated, and said ring fully bridges the gap between the coatings of the pipe sections.

Claim 8

The taper joint of claim 5, wherein said angular difference is at least 2°.

Claim 9

In a pipe joint the combination of: a first metal pipe section and a second metal pipe section, said first pipe section having an integral bell consisting of (1) a cylindrical portion of substantial length and having a bore whose diameter is slightly smaller than the outer diameter of the second pipe section to form a metal-to-metal interference fit therebetween, and of (2) a conical portion extending from said cylindrical portion and tapering inwardly; said second pipe section having an integral pin consisting of a conical portion tapering inwardly, the length of the pin's conical portion being slightly smaller than the length of the bell's conical portion, and the conical portion of the bell having an angle of taper smaller than the pin's angle of taper, whereby when the pin is forcibly and fully telescoped inside the bell, the inner conical surface of the bell and the outer conical surface of the pin form a cavity therebetween which extends from the interface between the bell's conical and cylindrical portions toward the end face of the pin; and a compressed adhesive disposed in said cavity and forming a solid wall bonding the pin to the bell.

Claim 10

In a pipe joint the combination of: a first metal pipe section and a second metal pipe section, said first pipe section having an integral bell consisting of (1) a cylindrical portion of substantial length and having a bore whose diameter is slightly smaller than the outer diameter of the second pipe section to form a metal-to-metal interference fit therebetween, and of (2) a conical portion extending from said cylindrical portion and tapering inwardly; said second pipe section having an integral pin consisting of a conical portion tapering inwardly, the length of the pin's conical portion being slightly smaller than the length of the bell's conical portion, and the conical portion of the bell having an angle of taper smaller than the pin's angle of taper, whereby when the pin is forcibly and fully telescoped inside the bell, the inner conical surface of the bell and the outer conical surface of the pin form a cavity therebetween which extends from the interface between the bell's conical and cylindrical portions toward the end face of the pin; and a compressed adhesive disposed in said cavity and forming a solid wall bonding the pin to the bell.

Claim 11

The pipe joint according to claim 7 wherein said adhesive forms a ring at the mouth between the end face of the pin and the opposite portion of the bell's inner conical wall.

Claim 12

The pipe join of claim 8, wherein said pipe sections are internally coated and said ring forms integral part with the coatings of said pipe sections.

Claim 13

The pipe joint of claim 9 wherein said bell's angle of taper is smaller by at least 2° compared to the pin's angle of taper.