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US 4,241,287 AGranted
Apparatus for welding pins to a tube interior
AssigneeGotaverken Anteknik AB
InventorBertil H. Sjoholm
Life of this patent
Estimating the term…
Abstract
The disclosure relates to a tube with surface-enlarging elements attached to the inside thereof, which elements are in the form of radially inwardly directed pins welded on the tube wall. A method and apparatus for forming such a tube are also provided, the apparatus comprising a holder for each pin which is movable both longitudinally and radially of the tube.
Claims18
Apparatus for manufacturing tubes with pins welded on the inside thereof comprising:
- at least one holder for detachably holding a pin to be welded;
- elongated holder support means for supporting said holder;
- tube support means for supporting the tube in axial alignment with said holder and said holder support means;
- drive means for moving said tube support means and said holder support means relative to one another so that said holder can be inserted in or retracted from the tube;
- pressing means located along said holder support means for pressing the pin held by said holder radially outwards against the tube wall;
- and
- welding means for welding the pin to the tube wall.
4 more elements
Apparatus for manufacturing tubes with pins welded on the inside thereof comprising:
- at least one holder comprising two parts hinged to one another, each of said parts having a pin-engaging portion, and means for urging said pin-engaging portions together to frictionally hold a pin therebetween;
- elongated holder support means for supporting said holder;
- tube support means for supporting the tube in axial alignment with said holder and said holder support means;
- drive means for moving said tube support means and said holder support means relative to one another so that said holder can be inserted in or retracted from the tube;
- pressing means for pressing the pin held by said holder against the tube wall;
- and
- welding means for welding the pin to the tube wall.
4 more elements
Apparatus for manufacturing tubes with pins welded on the inside thereof comprising:
- a number of holders each adapted to detachably hold a pin to be welded;
- a corresponding number of resilient rods for carrying said holders;
- an elongated, tubular holder support means enclosing said resilient rods, and having a distal end to be introduced into said tube;
- tube support means for supporting the tube in axial alignment with said holder support means;
- drive means for moving said tube support means and said holder support means relative to one another so that said holders can be inserted in or retracted from the tube;
- welding means for welding the pin to the tube wall;
- a guide body at the distal end of said tubular holder support, and radial slots in said guide body, each receiving one holder carrying rod;
- elastic means between said rods and said tubular holder support for urging said rods against the center of said holder means;
- and
- an inflatible air cushion located in the space formed between said rods, and means to inflate said cushion at will, to bring said pins into contact with the internal wall of said tube.
7 more elements
Dependencies are inferred from the claim text.