US 5,345,801 AGranted

Procedure and apparatus for forming a rectangular collar at the end of a pipe

AssigneeGS-Hydro Oy

InventorMatti Paakkunainen

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Abstract

A procedure and an apparatus for forming a rectangular collar at the end of a pipe (16) shape the pipe using a forming element (8) which is moved in the axial direction of the pipe (16) towards the pipe (16) and rotated along the edge surface of the pipe end about the longitudinal axis of the pipe. In the procedure, a conical collar is first produced, whereupon the forming element (8) is moved in the axial direction of the pipe away from the pipe (16) and turned to a position where its forming face is substantially perpendicular to the longitudinal axis of the pipe, whereupon a rectangular collar is formed. The apparatus is provided with a turning device (15) allowing the forming element to be turned about its fulcrum (9) into a first position, where the surface of the forming element is at an acute angle to the direction of the longitudinal axis of the pipe and the forming element (8) is supported by a first bearing surface (13), and into a second position, where the surface of the forming element is substantially perpendicular to the direction of the longitudinal axis of the pipe and the forming element (8) is supported by a second bearing surface (14).

Claims20

Dependent claims

A method for forming a substantially rectangular collar at the end of a pipe, the pipe having a longitudinal axis and the method comprising the steps of:

providing a forming element with a forming face, the forming element being movably mounted in a carriage such that the forming element is rotatable about a central axis extending through the forming element and is movable relative to the carriage;
placing the forming element against the pipe end;
moving the forming element in an axial direction of the pipe towards the pipe;
rotating the forming element around the longitudinal axis of the pipe, the forming element being in engagement with the pipe end;
producing a conical collar at the pipe end by rotation of the forming element around the pipe end, the forming face of the forming element being at an acute angle with respect to the longitudinal axis of the pipe during production of the conical collar;
moving the forming element away from the pipe after the step of producing a conical collar;
positioning the forming element such that the forming face is substantially perpendicular to the longitudinal axis of the pipe after the step of moving the forming element away from the pipe, the step of positioning comprising,
disengaging an upper end of the forming element from a first slot in the carriage by sliding the forming element relative to the carriage,
pivoting the forming element about a lower end thereof to thereby move the upper end of the forming element from next to the first slot to a position next to a second slot in the carriage,
engaging the upper end of the forming element into the second slot by sliding the forming element relative to the carriage;
moving the forming element back into engagement with the pipe end;
and
rotating the forming element around the longitudinal axis of the pipe to form a rectangular collar at the pipe end while the forming face is substantially perpendicular to the longitudinal axis of the pipe.

10 more elements

Apparatus for forming a substantially rectangular collar at an end of a pipe, the pipe having a longitudinal axis and the apparatus comprising:

a carriage mounted on a tool body, the carriage being movable toward and away from the pipe and being rotatable around the longitudinal axis of the pipe;
a forming element rotatably mounted on the carriage, the forming element having a forming face, the forming element also being slidably movable relative to the carriage, the forming face of the forming element being engagable with and disengagable from the pipe when the carriage moves toward and away from the pipe;
a first and second slot provided in the carriage, an upper end of the forming element being engagable and disengagable from either one of the first and second slots;
turning means for moving the upper end of the forming element between the first slot and the second slot and for pivoting the forming element about a fulcrum at a lower end thereof during movement of the forming element between the slots, the forming face of the forming element being at an acute angle with respect to the longitudinal axis of the pipe when the upper end of the forming element is in the first slot and the forming face being substantially perpendicular to the longitudinal axis of the pipe when the upper end of the forming element is in the second slot;
guides provided in the carriage, the fulcrum at the lower end of the forming element being slidable in the guides such that the lower end of the forming element is movable toward and away from the longitudinal axis of the pipe before and after pivoting of the forming element by the turning means, the turning means sliding the forming element in the guides thereby engages and disengages the upper end of the forming element from the slots.

2 more elements

Dependencies are inferred from the claim text.