Tube coupling

A fluid conduit coupling comprising:

• an outer housing having an internal bore with a circumferential side wall,
• a seal support surface in said bore,
• a seal engaged in said support surface,
• a spacer bushing retaining said seal in said support surface, said spacer bushing having an axially inner side and an axially outer side,
• a first gripper ring located axially outward of the seal and having radially and axially inwardly protruding circumferentially spaced gripper teeth having inner edges protruding inwardly into said internal bore, said gripper ring lying adjacent said spacer bushing, said teeth arranged for providing a twist when subjected to simultaneous rearward axial and rotational forces,
• a second gripper ring also having radially and axially inwardly protruding circumferentially spaced gripper teeth having inner edges protruding inwardly into said internal bore, and
• means for securing said spacer bushing in said internal bore.

A fluid conduit coupling comprising:

• an outer housing having an internal bore with a circumferential side wall,
• a seal in said bore,
• a spacer bushing having an axially inner side and an axially outer side,
• a first circular continuous gripper ring having radially and axially inwardly protruding circumferentially spaced gripper teeth having inner edges protruding inwardly into said internal bore, said teeth protruding into said bore for holding a tube against axial movement, said gripper ring mounted against rotation,
• at least one additional gripper ring also having radially and axially inwardly protruding circumferentially spaced gripper teeth having inner edges protruding inwardly into said internal bore, and
• said spacer bushing and gripper rings being held in said internal bore.

A fluid conduit coupling comprising:

• an outer housing having an internal bore with a circumferential side wall,
• a seal support surface in said bore,
• a seal engaged in said support surface,
• a spacer bushing retaining said seal in said support surface, said spacer bushing having an axially inner side and an axially outer side,
• a gripper ring having radially and axially inwardly protruding circumferentially spaced gripper teeth having inner edges protruding inwardly into said internal bore, said gripper ring lying adjacent the axially outer side of said spacer bushing, said teeth having a twist when subjected to an axial outwardly directed and rotational force for allowing the unscrewing and removal of a tube inserted in said coupling,
• means for securing said spacer bushing in said internal bore, and
• said spacer bushing having circumferentially spaced grooves, the gripper teeth of said gripper ring aligned and fitted within said grooves.

A fluid conduit coupling comprising:

• an outer housing having an internal bore with a circumferential side wall,
• a seal support surface in said bore,
• a seal engaged in said support surface,
• a spacer bushing retaining said seal in said support surface, said spacer bushing having an axially inner side and an axially outer side,
• a gripper ring having radially and axially inwardly protruding circumferentially spaced gripper teeth having inner edges protruding inwardly into said internal bore, said gripper ring lying adjacent the axially outer side of said spacer bushing, said teeth having a twist when subjected to an axial outwardly directed and rotational force for allowing the unscrewing and removal of a tube inserted in said coupling,
• means for securing said spacer bushing in said internal bore,
• said internal bore having circumferentially spaced inner ribs.
• said end bushing having circumferentially spaced tube guide ribs, and
• wherein said spacer bushing securing means includes an end bushing welded to said outer housing.

A fluid conduit coupling for removably holding a tube therein comprising:

• an outer housing having an internal bore with a circumferential side wall,
• a seal support surface in said bore,
• a seal engaged in said support surface,
• a spacer bushing retaining said seal in said support surface, said spacer bushing having an axially inner side and an axially outer side,
• a gripper ring having radially and axially inwardly protruding circumferentially spaced gripper teeth having inner edges protruding inwardly into said internal bore, said gripper ring lying adjacent the axially outer side of said spacer bushing, said teeth having a twist when subjected to an axial outwardly directed and rotational force for allowing the unscrewing and removal of a tube inserted in said coupling, said gripper ring held in said outer housing to preclude rotational movement of the gripper ring,
• said spacer bushing being secured in said internal bore, and
• said spacer bushing having circumferentially spaced grooves, the gripper teeth of said gripper ring aligned and fitted within said grooves.

A fluid conduit coupling for removably holding a tube therein comprising:

• an outer housing having an internal bore with a circumferential side wall,
• a seal support surface in said bore,
• a seal engaged in said support surface,
• a spacer bushing retaining said seal in said support surface, said spacer bushing having an axially inner side and an axially outer side,
• a gripper ring having radially and axially inwardly protruding circumferentially spaced gripper teeth having inner edges protruding inwardly into said internal bore, said gripper ring lying adjacent the axially outer side of said spacer bushing, said teeth having a twist when subjected to an axial outwardly directed and rotational force for allowing the unscrewing and removal of a tube inserted in said coupling arranged for providing a twist when subjected to simultaneous rearward axial and rotational forces, said gripper ring held in said outer housing to preclude rotational movement of the gripper ring,
• said spacer bushing being secured in said internal bore, and
• said spacer bushing having circumferentially spaced grooves, the gripper teeth of said gripper ring aligned and fitted within said grooves,
• said internal bore having circumferentially spaced inner ribs,
• said end bushing having circumferentially spaced tube guide ribs, and
• wherein said spacer bushing is secured in said internal bore by said end bushing welded to said outer housing.