Cleanout fitting combination

Claim 2

A plumbing fitting combination, of a hollow body adapted to be joined to a pipe and having a round, female-threaded, body opening, with a removable plug for closing that body opening, said body having a formation surrounding and defining the opening provided by a circumferential inward thick lip threaded with a female taper thread, and a circumferential seal seat on the outer side of said lip; a compressible seal ring received by said seat; and a removable shouldered plug for said opening having at its outer end a circumferential shoulder adapted to engage with and to apply body-to-plug sealing forces to the seal ring upon inward axial advance of the plug, and running from its inner end, a short length of male thread of the same pitch as the female thread for screwed plug engagement in the body opening; the male thread being diametrically proportioned, along its length relative to the female thread for a non-interfering threaded engagement enabling axial plug advance to required compression of the seal ring, whereby with the fitting body, there may be optionally used a plug having a male taper thread corresponding to the female thread thereby to effect a thread-to-thread seal between the screwed-in plug and the body.

Claim 3

The fitting combination of claim 1, wherein said female thread is a standard taper pipe thread, and said male thread is a standard straight pipe thread, with pitch diameter corresponding to the pitch diameter of the innermost female thread turn.

Claim 4

The fitting combination of claim 1, wherein said female thread is a standard taper pipe thread, and said male thread is a taper pipe thread modified to afford a loose engagement with the female thread, enabling free turning for a plug axial inward advance to compress said seal.

Claim 5

The fitting combination of claim 1, wherein said seat has a counterbore-like form and is provided by an axially outer side of said lip and a surface flaring radially and axially outward away from the lip outer side to provide a female tapered seat portion; and the said circumferential shoulder on the outer end of the said shouldered plug is an inwardly convergent male tapered shoulder with taper corresponding to the female taper of the seat.

Claim 6

The fitting combination of claim 4, wherein said tapered shoulder on the said shouldered plug tapers inwardly to a diameter smaller than the root diameter of the adjacent end turn of the plug thread; there being a clearance relief from the inner end of the plug shoulder taper to the said end turn.

Claim 7

The fitting combination of claim 1, adapted by the configuration of said body to serve for a cleanout fitting, and wherein said body has an integral hollow cylindrical outer end portion receiving the closure plug, and said formation is constituted by said lip being spaced inward from the outer end of the cylindrical portion and defining, with the inside surface of the outboard part of the cylindrical portion, a counterbore-like said seat.

Claim 8

The fitting combination of claim 6, wherein said female thread is a taper thread, and said male thread is a straight thread, with pitch diameter corresponding, with free turning clearance, to the pitch diameter of the innermost female thread turn.

Claim 9

The fitting combination of claim 6, wherein said female thread is a taper thread, and said male thread is a taper thread modified to afford a loose engagement with the female thread, enabling free turning for a plug axial inward advance to compress said seal.

Claim 10

For use in a plumbing fitting combination, of a hollow body adapted to be joined at one end to a pipe and at the other end having a round, female-threaded, body opening, with a removable plug for closing that body opening; an improved said body having said opening threaded with a multi-turn female taper thread adapted to receive a plug correspondingly male taper threaded to make a thread-to-thread seal, and an internal annular end formation surrounding the opening outwardly of said female thread and defining a circumferential seal seat at the outer end of said female thread; said seat being adapted to receive entirely and support a seal ring for compression by a shouldered removable plug having at the plug outer end a circumferential shoulder adapted to engage with and to apply body-to-plug sealing forces to the seal ring upon inward axial advance of the plug, and, running from the plug inner end, a short multi-turn length of male thread of the same pitch as the female thread and diametrically proportioned, along its length, relative to the female thread for a non-interfering threaded engagement, whereby with the fitting body, there may be optionally used either a non-gasketed plug having a male tapered thread corresponding to the female thread to effect a thread-to-thread seal between the screwed-in plug and the body, or a gasketed plug with a non-interfering thread and gasketed by a said seal ring.

Claim 11

For use in a plumbing fitting combination, of a hollow body adapted to be joined at one end to a pipe and at the other end having a round, female-threaded, body opening, with a removable plug for closing that body opening; an improved said body having said opening threaded with a multi-turn female taper thread adapted to receive a plug correspondingly male taper threaded to make a thread-to-thread seal, and an internal annular end formation surrounding the opening outwardly of said female thread and defining a circumferential seal seat at the outer end of said female thread; said seat being adapted to receive entirely and support a seal ring for compression by a shouldered removable plug having at the plug outer end a circumferential shoulder adapted to engage with and to apply body-to-plug sealing forces to the seal ring upon inward axial advance of the plug, and, running from the plug inner end, a short multi-turn length of male thread of the same pitch as the female thread and diametrically proportioned, along its length, relative to the female thread for a non-interfering threaded engagement, whereby with the fitting body, there may be optionally used either a non-gasketed plug having a male tapered thread corresponding to the female thread to effect a thread-to-thread seal between the screwed-in plug and the body, or a gasketed plug with a non-interfering thread and gasketed by a said seal ring.

Claim 12

As a plumbing fitting combination, a body as described in claim 9 and wherein said female thread is a tapered pipe thread and, a said gasketed plug male threaded with a straight pipe thread with pitch diamter corresponding to the pitch diameter of the innermost female thread turn.

Claim 13

As a plumbing fitting combination, a body as described in claim 9 wherein said female thread is a tapered pipe thread and, a said gasketed plug male-threaded with a taper pipe thread modified to afford a loose engagement with the female thread, enabling free turning for a plug axial inward advance to compress said seal.

Claim 14

As a plumbing fitting combination, a body as described in claim 9 and wherein said seat has a counter-bore-like form and is provided by a body internal shoulder on an axially outer side of said female thread and a surface flaring radially and axially outward away from the body shoulder to provide a female tapered seat portion, and a gasketed plug whereof the said circumferential shoulder on the outer end is an inwardly convergent male tapered shoulder with taper corresponding to the female taper of the seat.

Claim 15

The fitting combination of claim 12, wherein said tapered shoulder on the said gasketed plug tapers inwardly to a diameter smaller than the root diameter of the adjacent end turn of the plug thread, there being a clearance relief from the inner end of the plug shoulder taper to the said end turn.

Claim 16

In the fitting combination of claim 9, said body being adapted in configuration to serve for a cleanout fitting, said body having an intergral hollow cylindrical outer end portion for receiving the closure plug, and said formation constituted by a lip being spaced inward from the outer end of the cylindrical portion and defining, with the inside surface of the outboard part of the cylindrical portion, a counterbore-like said seat.