Mould and sealing ring

A mold and sealing ring adapted for forming a pipe end and sealing the pipe end to a spigot end of another pipe in a pipe joint, said sealing ring comprising:

• a first annular sealing portion of elastically yieldable sealing material;
• and
• a second annular reinforcing portion of a rigid material relative to said sealing material, said portions being positioned axially adjacent each other and in abutting relation to each other with said reinforcing portion having a section of less radial extension than said sealing portion, said reinforcing portion having a radially resilient wedge-shaped edge portion for expansion over a mandrel of greater outside diameter, wherein said edge portion includes a plurality of circumferentially disposed recesses to impart resiliency thereto.

A mold and sealing ring comprising:

• a first annular sealing portion of elastically yieldable sealing material, said sealing portion having an outer peripheral portion radially outside said reinforcing portion and an inner peripheral portion radially inside said reinforcing portion;
• and
• a second annular reinforcing portion of a rigid material relative to said sealing material, said portions being positioned axially adjacent each other and in abutting relation to each other with said reinforcing portion having a section of less radial extension than said sealing portion.

A mold and sealing ring adapted for forming a pipe end and sealing the pipe end to a spigot end of another pipe in a pipe joint, said sealing ring comprising:

• a first annular sealing portion of elastically yieldable sealing material;
• and
• a second annular reinforcing portion of a rigid material relative to said sealing material, said portions being positioned axially adjacent each other and in abutting relation to each other with said reinforcing portion having a section of less radial extension than said sealing portion, wherein said portions abut along non-planar surfaces and each of said portions has a V-shaped surface matingly received in the other portion.

A mold and sealing ring adapted for forming a thermoplastic pipe end and sealing the thermoplastic pipe end to a spigot end of another pipe in a pipe joint, said sealing ring comprising:

• a first annular sealing portion of elastically yieldable sealing material having an outer peripheral projecting portion and an inner peripheral projecting portion coplanar with said outer projecting portion;
• and
• a second annular reinforcing portion of a rigid material positioned axially adjacent and in abutting relation with said sealing portion, said reinforcing portion having a wedge-shape for guiding of a heated plastic pipe end thereover, and being of less radial extent than said outer projecting portion of said sealing portion and of greater radial extent than said inner projecting portion of said sealing portion, and wherein said reinforcing portion has a resiliently expandable edge portion which includes a plurality of circumferentially disposed recesses to impart resiliency thereto.

A mold and sealing ring adapted for forming a thermoplastic pipe end and sealing the thermoplastic pipe end to a spigot end of another pipe in a pipe joint, said sealing ring comprising:

• a first annular sealing portion of elastically yieldable sealing material having an outer peripheral projecting portion and an inner peripheral projecting portion coplanar with said outer projecting portion;
• and
• a second annular reinforcing portion of a rigid material positioned axially adjacent and in abutting relation with said sealing portion, said reinforcing portion having a wedge-shape for guiding of a heated plastic pipe end thereover, and being of less radial extent than said outer projecting portion of said sealing portion and of greater radial extent than said inner projecting portion of said sealing portion, wherein said reinforcing portion has a V-shaped portion extending into said sealing portion between said projecting portions to stiffen said sealing portion.