Bell fitting for reinforced plastic-mortar pipe and the like

Claim 2

A bell-type fitting for reinforced plastic-mortar pipe, for use with the spigot end of said pipe having an O-ring gasket therearound seated in an exterior groove thereof for peripheral sealing engagement with the inner surface of the bell-tight fitting and with the pipe, respectively, comprising: an interiorly-lined iron pipe section having welded to each end in end-to-end abutment, a generally cylindrical sleeve of sheet metal of a wall thickness substantially less than the wall thickness of said iron pipe and having one end radially inturned and extending in to the same inner diameter as said iron pipe and a directly succeeding gasket-engaging cylindrical spin-formed portion of diameter equal to the largest diameter of said radially inturned portion, said sleeve having a terminal flaring portion, said sleeve having greatly increased tensile strength relative to a sleeve formed by rolling and having resistance to change from true roundness by the heat of welding, said cylindrical portion sealing accurately upon engagement with a said gasket ring without the necessity of water pressure and sealing both in the presence and absence of such water pressure.

Claim 3

The fitting of claim 1 wherein said sleeve is coated with a coating continuous with a coating of said iron pipe and wherein the inner diameter of said fitting is the same as that of said pipe to which it is to be coupled.

Claim 4

spin-forming said sleeve to provide a lead-in frustoconical portion at one end of said sleeve, a succeeding reduced-diameter cylindrical portion having increased tensile strength, and a terminal in-turned radial portion at the other end of said sleeve,

Claim 5

spin-forming said sleeve to provide a lead-in frustoconical portion at one end of said sleeve, a succeeding reduced-diameter cylindrical portion having increased tensile strength, and a terminal in-turned radial portion at the other end of said sleeve,

Claim 6

spin-forming said sleeve to provide a frustoconical lead-in portion, a succeeding reduced diameter cylindrical portion having increased tensile strength, and a terminal inturned radial portion at one end of said sleeve, and

Claim 7

spin-forming said sleeve to provide a frustoconical lead-in portion, a succeeding reduced diameter cylindrical portion having increased tensile strength, and a terminal inturned radial portion at one end of said sleeve, and

Claim 8

spin-forming said sleeve to provide a frustoconical inwardly-tapering end portion, a succeeding reduced diameter cylindrical portion having increased tensile strength, and a terminal in-turned radial portion at the other end of said sleeve,

Claim 9

spin-forming said sleeve to provide a frustoconical inwardly-tapering end portion, a succeeding reduced diameter cylindrical portion having increased tensile strength, and a terminal in-turned radial portion at the other end of said sleeve,

Claim 10

welding said in-turned radial portion of sleeve to said iron pipe to provide a terminal bell type of fitting, and

Claim 11

welding said in-turned radial portion of sleeve to said iron pipe to provide a terminal bell type of fitting, and

Claim 12

A fitting for reinforced plastic-mortar pipes comprising an attachment butt-welded to the ends of an interiorly lined iron or steel pipe section for cooperation with a spigot at one end of a length of reinforced plastic-mortar pipe Having an exterior groove with a gasket ring therein, said attachment comprising: a generally cylindrical spin-formed sleeve of sheet metal thinner than said iron pipe, having one flaring end portion substantially larger than said spigot and a directly succeeding cylindrical spin-formed, smooth-walled gasket-engaging portion of smaller diameter than the outer end of the flaring portion, said sleeve having a terminal radially inturned radial portion, said sleeve having greatly increased tensile strength relative to a rolled sleeve of the same thickness and having marked resistance to change from true roundness by the heat of welding.

Claim 13

A fitting for reinforced plastic-mortar pipes comprising an attachment butt-welded to the ends of an interiorly lined iron or steel pipe section for cooperation with a spigot at one end of a length of reinforced plastic-mortar pipe Having an exterior groove with a gasket ring therein, said attachment comprising: a generally cylindrical spin-formed sleeve of sheet metal thinner than said iron pipe, having one flaring end portion substantially larger than said spigot and a directly succeeding cylindrical spin-formed, smooth-walled gasket-engaging portion of smaller diameter than the outer end of the flaring portion, said sleeve having a terminal radially inturned radial portion, said sleeve having greatly increased tensile strength relative to a rolled sleeve of the same thickness and having marked resistance to change from true roundness by the heat of welding.

Claim 14

weldiNg said radial portion of said sleeve to said iron pipe, to provide a terminal coupler member.

Claim 15

weldiNg said radial portion of said sleeve to said iron pipe, to provide a terminal coupler member.

Claim 16

welding said sleeve to said iron pipe at said radial portion to provide a terminal coupler member.

Claim 17

welding said sleeve to said iron pipe at said radial portion to provide a terminal coupler member.

Claim 18

The fitting of claim 3 coated with material continuous with that of said iron pipe.

Claim 19

placing a spigot end of said reinforced plasticmortar pipe coupler with a gasket retained thereby into the fitting and forcing it into place so that said gasket engages the cylindrical portion.

Claim 20

placing a spigot end of said reinforced plasticmortar pipe coupler with a gasket retained thereby into the fitting and forcing it into place so that said gasket engages the cylindrical portion.

Claim 21

An assembly comprising: a reinforced plastic-mortar spigot having an exterior cylindrical groove with a solid elastomeric gasket ring therein, a bell-like fitting sealable with the exterior surface of said gasket ring, said fitting comprising an interiorly lined metal pipe section having welded to each end in end-to-end abutment, a generally cylindrical sleeve of sheet steel of a wall thickness substantially less than the wall thickness of said metal pipe and a cylindrical gasket-engaging portion and, at one end thereof a directly succeeding radially inturned portion strengthening said cylindrical portion and welded to said pipe section and, at the other end thereof, a frustoconical flaring portion for entry of said spigot, said sleeve being spin-formed from a sheet metal cylinder of larger diameter than said sleeve and thereby having greatly increased tensile strength with respect to a sleeve of rolled metal of the same thickness and better resistance to distortion in shape by the heat of welding, said spigot coupler being placed into said fitting with its said gasket ring engaging said cylindrical portion and sealing against said spin-formed portion both in the presence and absence of hydraulic pressure.

Claim 22

An assembly comprising: a reinforced plastic-mortar spigot having an exterior cylindrical groove with a solid elastomeric gasket ring therein, a bell-like fitting sealable with the exterior surface of said gasket ring, said fitting comprising an interiorly lined metal pipe section having welded to each end in end-to-end abutment, a generally cylindrical sleeve of sheet steel of a wall thickness substantially less than the wall thickness of said metal pipe and a cylindrical gasket-engaging portion and, at one end thereof a directly succeeding radially inturned portion strengthening said cylindrical portion and welded to said pipe section and, at the other end thereof, a frustoconical flaring portion for entry of said spigot, said sleeve being spin-formed from a sheet metal cylinder of larger diameter than said sleeve and thereby having greatly increased tensile strength with respect to a sleeve of rolled metal of the same thickness and better resistance to distortion in shape by the heat of welding, said spigot coupler being placed into said fitting with its said gasket ring engaging said cylindrical portion and sealing against said spin-formed portion both in the presence and absence of hydraulic pressure.

Claim 23

The assembly of claim 5 wherein said sleeve is coated with material continuous with the coating around said metal pipe and said fitting having an inner diameter the same as that of said pipe.

Claim 26

The method of claim 7 including also lining the edge of said inturned radial portion of said sleeve at the same inner periphery as that in said iron pipe, and covering said iron pipe and said sleeve, as made in step (2) with a reinforced coating and curing.