Apparatus for forming tube end sockets

Claim 2

Apparatus for forming a socket at an end of a pipe fabricated from thermoplastic synthetic resin material and having external ribs, beads, or the like extending thereabout in cross-sectional planes or helically, comprising: expanding mandrel means, a supporting mandrel means and means for supporting said mandrel means for reciprocal motion in the axial direction of said pipe and for rotary motion about the longitudinal axis of said pipe, said expanding mandrel means including a guide member having an external dimension slighly smaller than the internal cross-sectional dimension of said pipe and a forming member arranged axially behind said guide member, said forming member having an external configuration corresponding to the desired internal configuration of the socket to be formed in the end of said pipe, means operatively associated with said supporting mandrel means for securing said pipe in a fixed position relative to said mandrel means, drive means for selectively reciprocating said mandrel means in the axial direction of said pipe whereby said mandrel means can be inserted into and removed from said pipe and for selectively imparting rotary motion to said mandrel means during insertion into and removal from said pipe, and means for selectively controlling the temperature of said mandrel means.

Claim 3

Apparatus according to claim 1, wherein said guide member has a substantially cylindrical configuration and wherein said mandrel means further includes a generally conical transition section disposed between said guide member and said forming member.

Claim 4

Apparatus according to claim 1, further comprising edge trimming means for cutting said pipe including at least one cutting block means supported upon said mandrel means and projecting outwardly therefrom to an extent exceeding the largest radial dimension thereof.

Claim 5

Apparatus for forming a socket at an end of a pipe fabricated from thermoplastic synthetic resin material and having external projections extending therefrom comprising: expanding mandrel means, a supporting mandrel means and means for supporting said mandrel means for reciprocal motion in the axial direction of said pipe and for rotary motion about the longitudinal axis of said pipe, said expanding mandrel means including a guide member having an external dimension slightly smaller than the interal cross-sectional dimension of said pipe and a forming member arranged axially behind said guide member, said forming member having an external configuration corresponding to the desired internal configuration of the socket to be formed in the end of said pipe, means operatively associated with said supporting mandrel means for securing said pipe in a fixed position relative to said mandrel means said means for securing said pipe in a fixed position relative to said mandrel means includes the mandrel means having in advance of said guide member, a central, axial, rod-shaped, cylindrical extension, said supporting mandrel being disposed on said cylindrical extension for axial displacement and rotation relative to said cylindrical extension, said supporting mandrel having an external configuration corresponding substantially to the internal configuration of said pipe, and blocking means for selectively fixing said supporting mandrel relative to said extension and clamping means external of said pipe in an axial position corresponding to the relative position of said supporting mandrel, for applying pressure to said pipe thereby securing said pipe in said fixed position between sAid supporting mandrel and said clamping means, and drive means for selectively reciprocating said mandrel means in the axial direction of said pipe whereby said mandrel means can be inserted into and removed from said pipe and for selectively imparting rotary motion to said mandrel means during insertion into and removal from said pipe.

Claim 6

Apparatus for forming a socket at an end of a pipe fabricated from thermoplastic synthetic resin material and having external projections extending therefrom comprising: expanding mandrel means, a supporting mandrel means and means for supporting said mandrel means for reciprocal motion in the axial direction of said pipe and for rotary motion about the longitudinal axis of said pipe, said expanding mandrel means including a guide member having an external dimension slightly smaller than the interal cross-sectional dimension of said pipe and a forming member arranged axially behind said guide member, said forming member having an external configuration corresponding to the desired internal configuration of the socket to be formed in the end of said pipe, means operatively associated with said supporting mandrel means for securing said pipe in a fixed position relative to said mandrel means said means for securing said pipe in a fixed position relative to said mandrel means includes the mandrel means having in advance of said guide member, a central, axial, rod-shaped, cylindrical extension, said supporting mandrel being disposed on said cylindrical extension for axial displacement and rotation relative to said cylindrical extension, said supporting mandrel having an external configuration corresponding substantially to the internal configuration of said pipe, and blocking means for selectively fixing said supporting mandrel relative to said extension and clamping means external of said pipe in an axial position corresponding to the relative position of said supporting mandrel, for applying pressure to said pipe thereby securing said pipe in said fixed position between sAid supporting mandrel and said clamping means, and drive means for selectively reciprocating said mandrel means in the axial direction of said pipe whereby said mandrel means can be inserted into and removed from said pipe and for selectively imparting rotary motion to said mandrel means during insertion into and removal from said pipe.

Claim 7

An apparatus according to claim 1, wherein said means for selectively controlling the temperature of said mandrel means includes means for heating said mandrel means prior to insertion of said mandrel means into said pipe and means for cooling said mandrel means prior to removal of said mandrel means from said pipe.