Assembly for forming the bell end of a bell and spigot joint

Claim 2

An assembly for use in forming an inner-circumferential groove in a heat deformable pipe, said assembly comprising: a. an elongated cylindrical mandrel adapted for insertion concentrically within one end of a heat deformable pipe by relative movement between the mandrel and pipe; b. said mandrel including about its outer periphery a circumferential recess; c. a circumferential sealing gasket, a circumferential portion of which is located within said recess and a circumferential portion of which is located outside said recess; d. an annular ramped surface comprising one circumferential side of said recess and tapering radially outwardly and away from the other side of said recess; and e. means for guiding said one end of said pipe outwardly of said gasket as said end approaches said gasket during said relative movement.

Claim 3

An assembly according to claim 1 including an annular shoulder positioned around the periphery of said mandrel and located to one side of said recess opposite said ramped surface, said shoulder being adapted to engage with a support ring positionable on said mandrel whereby to prevent axial movement of said ring in a direction away from said recess.

Claim 4

An assembly according to claim 1 including an end ring positioned concentrically about said mandrel and located to one side of said recess opposite said ramped surface, said end ring including a pipe engaging surface tapering radially inwardly and away from said recess, said pipe engaging surface being adapted to engage with the mandrel receiving end of said pipe for directing said end radially inwardly.

Claim 5

An assembly according to claim 1 including a pipe directing ring having a circumferential surface portion positioned concentrically about said mandrel and located adjacent the radially outermost end of said ramped surface, said surface portion including an inclined surface adapted to direct the mandrel receiving end of said pipe radially outwardly.

Claim 6

An assembly for use in forming the bell end of a bell and spigot joint in one end section of a heat deformable pipe, said assembly comprising: a. an elongated cylindrical mandrel adapted for insertion concentrically within one end of a heat deformable pipe, said mandrel having a first longitudinal section and a second radially larger section joining said first section by a tapering intermediate section, said second larger section including about its periphery a circumferential recess adapted to receive a ring-shaped sealing gasket and an annular ramped surface tapering radially outwardly and away from said circumferential recess, said ramped surface being adapted to radially outwardly deform said sealing gasket; b. an annular shoulder positioned around the periphery of said second mandrel section and located to one side of said groove opposite said ramped surface, said shoulder being adapted to engage with a support ring positionable on said mandrel whereby to prevent axial movement of said ring in a direction away from said recess; c. an end ring positioned concentrically about the second section of said mandrel and located to one Side of said shoulder opposite said recess, said end ring including a pipe engaging surface tapering radially inwardly; d. and a pipe directing ring positioned concentrically about said second section and located adjacent the radially outermost end of said ramped surface, said directing ring including an inclined surface adapted to direct the mandrel receiving end of said pipe radially outwardly.

Claim 7

An assembly for use in forming the bell end of a bell and spigot joint in one end section of a heat deformable pipe, said assembly comprising: a. an elongated cylindrical mandrel adapted for insertion concentrically within one end of a heat deformable pipe, said mandrel having a first longitudinal section and a second radially larger section joining said first section by a tapering intermediate section, said second larger section including about its periphery a circumferential recess adapted to receive a ring-shaped sealing gasket and an annular ramped surface tapering radially outwardly and away from said circumferential recess, said ramped surface being adapted to radially outwardly deform said sealing gasket; b. an annular shoulder positioned around the periphery of said second mandrel section and located to one side of said groove opposite said ramped surface, said shoulder being adapted to engage with a support ring positionable on said mandrel whereby to prevent axial movement of said ring in a direction away from said recess; c. an end ring positioned concentrically about the second section of said mandrel and located to one Side of said shoulder opposite said recess, said end ring including a pipe engaging surface tapering radially inwardly; d. and a pipe directing ring positioned concentrically about said second section and located adjacent the radially outermost end of said ramped surface, said directing ring including an inclined surface adapted to direct the mandrel receiving end of said pipe radially outwardly.

Claim 8

An assembly according to claim 5 wherein at least the second section of said mandrel is hollow and includes a plurality of passages extending from the internal surface of said second section to the external surface thereof, and wherein said mandrel further includes first and second O-ring receiving grooves defined around its outer periphery, said first O-ring receiving groove being positioned around said first section and said second section.

Claim 9

An assembly for use in forming an inner circumferential groove in a heat deformable pipe, said assembly comprising: a. an elongated mandrel having a predetermined cross-section and adapted for insertion within one end of a heat deformable pipe of a similarly shaped crosssection by relative movement between said mandrel and pipe; b. said mandrel including about its outer periphery a circumferential recess; c. a circumferential sealing gasket, a circumferential portion of which is located within said recess and a circumferential portion of which is located outside said recess; d. a circumferential ramped surface comprising one circumferential side of said recess and tapering outwardly and away from the other side of said circumferential recess; and e. means for guiding said one end of said pipe outwardly of said gasket as said end approaches said gasket during said relative movement.

Claim 10

An assembly for use in forming an inner circumferential groove in a heat deformable pipe, said assembly comprising: a. an elongated mandrel having a predetermined cross-section and adapted for insertion within one end of a heat deformable pipe of a similarly shaped crosssection by relative movement between said mandrel and pipe; b. said mandrel including about its outer periphery a circumferential recess; c. a circumferential sealing gasket, a circumferential portion of which is located within said recess and a circumferential portion of which is located outside said recess; d. a circumferential ramped surface comprising one circumferential side of said recess and tapering outwardly and away from the other side of said circumferential recess; and e. means for guiding said one end of said pipe outwardly of said gasket as said end approaches said gasket during said relative movement.

Claim 11

An assembly for use in forming an inner circumferential groove having retainable forming means disposed therein in a heat deformable pipe section, said assembly comprising: a. a core having a predetermined outer surface configuration including a circumferential recess about its periphery, said core being adapted for insertion concentrically within one end of a heat deformable pipe by relative movement between said core and pipe; b. a retainable forming means at least including a circumferential sealing gasket positioned around said core so that a circumferential portion of said gasket is disposed in said recess and a circumferential portion of said gasket is located outside of said recess and so that the combined outer surface configuration of said core and said retainable forming means is similar to the inner surface configuration desired to be formed in said pipe section; c. means for guiding said one end of said pipe outwardly of said gasket as said end approaches said gasket during said relative movement; d. means for outwardly deforming said gasket from said supported position during initial relative longitudinal movement of said positioned gasket and core whereby to aid in removing said gasket from said recess.

Claim 12

An assembly for use in forming an inner circumferential groove having retainable forming means disposed therein in a heat deformable pipe section, said assembly comprising: a. a core having a predetermined outer surface configuration including a circumferential recess about its periphery, said core being adapted for insertion concentrically within one end of a heat deformable pipe by relative movement between said core and pipe; b. a retainable forming means at least including a circumferential sealing gasket positioned around said core so that a circumferential portion of said gasket is disposed in said recess and a circumferential portion of said gasket is located outside of said recess and so that the combined outer surface configuration of said core and said retainable forming means is similar to the inner surface configuration desired to be formed in said pipe section; c. means for guiding said one end of said pipe outwardly of said gasket as said end approaches said gasket during said relative movement; d. means for outwardly deforming said gasket from said supported position during initial relative longitudinal movement of said positioned gasket and core whereby to aid in removing said gasket from said recess.

Claim 13

An assembly according to claim 8 wherein the inner cross-sectional configuration of said pipe section is circular.

Claim 14

An assembly according to claim 8 wherein said deforming means includes a circumferential ramped surface around the periphery of said core, said ramped surface comprising one circumferential side of said recess and tapering outwardly from the other circumferential side of said recess.

Claim 15

An assembly according to claim 10 wherein said retainable forming means includes at least one circumferential gasket support element.

Claim 16

An assembly for forming an inner circumferential groove having a circumferential retainable forming means disposed therein in a heat deformable pipe section, said assembly comprising: a. a core section having a predetermined outer surface configuration and being adapted for insertion concentrically within one end of a heat deformable pipe; b. circumferential retainable forming means at least including a circumferential sealing gasket; c. means for supporting said circumferential retainable forming means including said gasket in alignment with said core section such that in the supported position of the gasket the innermost periphery of said gasket is disposed inwardly of the outer surface configuration of said core section at all points along the inner periphery of the gasket and circumferential portion of said gasket extends outwardly of said outer surface configuration of said core section and such that the combined outer surface configuration of said core section and said retainable forming means is similar to the inner surface configuration desired to be formed in said pipe section; d. means for guiding said one end of said pipe outwardly of said gasket as said end approaches said gasket during relative movement; and d. means for outwardly deforming said gasket from said supported position as a result of initial relative longitudinal movement of said gasket and core section.

Claim 17

An assembly for forming an inner circumferential groove having a circumferential retainable forming means disposed therein in a heat deformable pipe section, said assembly comprising: a. a core section having a predetermined outer surface configuration and being adapted for insertion concentrically within one end of a heat deformable pipe; b. circumferential retainable forming means at least including a circumferential sealing gasket; c. means for supporting said circumferential retainable forming means including said gasket in alignment with said core section such that in the supported position of the gasket the innermost periphery of said gasket is disposed inwardly of the outer surface configuration of said core section at all points along the inner periphery of the gasket and circumferential portion of said gasket extends outwardly of said outer surface configuration of said core section and such that the combined outer surface configuration of said core section and said retainable forming means is similar to the inner surface configuration desired to be formed in said pipe section; d. means for guiding said one end of said pipe outwardly of said gasket as said end approaches said gasket during relative movement; and d. means for outwardly deforming said gasket from said supported position as a result of initial relative longitudinal movement of said gasket and core section.

Claim 18

An assembly according to claim 12 wherein the inner cross-sectional configuration of said pipe section is circular.

Claim 19

An assembly according to claim 12 wherein said supporting means comprises a circumferential recess about the periphery of said core section and wherein said gasket is positioned around said core section so that a circumferential portion of said forming means is disposed in said recess.

Claim 20

An assembly according to claim 14 wherein said deforming means comprises a circumferential ramped surface around the periphery of said core, said ramped surface comprising one circumferential side of said recess and tapering outwardly from the other circumferential side of said recess.

Claim 21

An assembly according to claim 15 wherein said forming means includes at least one circumferential gasket support element.