Bulging apparatus

Claim 2

A horizontal pipe bulging apparatus comprising: a. a split type horizontal die having upper and lower die members formed with a mold cavity inside and tapered on the outside over a certain desirable distance from the front end and having an inlet port; b. hydraulic pressure generating means for generating liquid under pressure having a piston chamber in communication with said inlet port; c. an outer cylinder having a tapered hollow adapted to receive said tapered upper and lower die members, said outer cylinder being moveable horizontally with respect to the axis of said die and into and out of engagement with said die; d. a plunger axially coupled to said outer cylinder and aligned with said die members, said plunger having a first passage axially disposed therethrough and a second passage transverse to said first passage and integral therewith; e. a chuck concentrically disposed about said plunger and coupled thereto, said chuck having a portion thereof in juxtaposition with said second passage and being responsive to the liquid under pressure whereby said chuck and plunger are urged against the pipe; and f. means for moving said outer cylinder horizontally comprising axles coupled to and disposed transverse to said outer cylinder, guide rails parallel to and on opposite sides of said die, and wheels pivotally coupled upon said axles and adapted to be rollingly received by said guide rails.

Claim 3

An apparatus according to claim 1 wherein the outer end of the pipe to be bulged is supported by an inner end of said sliding sleeve, said plunger and said chuck.

Claim 4

An apparatus according to claim 1 wherein said outer cylinder is moved horizontally forward and backward by a sliding sleeve adapted to be slidingly moved by hydraulic actuating means.

Claim 5

An apparatus according to claim 1 wherein a stepped cylindrical presser having a reduced diameter projection at the front adapted to fit in the rear of the pipe to be bulged is inserted in the inlet whereby hydraulic oil is supplied to the cavity of said die.

Claim 6

An apparatus according to claim 4 wherein the end surface of the reduced diameter projection of said stepped cylindrical presser has a cross-sectional area smaller than the cross-sectional area of the end surface of said presser on the oil inlet side.

Claim 7

A pipe bulging apparatus comprising: a. a split die having two separate die members pivotally coupled to each other at an end thereof and having complementary axial cavity portions therein for holding the pipe and a recess corresponding to the bulge to be disposed in the pipe, said cavity having first and second ends; b. a presser coupled within the first end of said cavity having an aperture axially disposed therethrough and an axial end thereof adapted to abut and be received by the first end of the pipe; c. hydraulic generating means for supplying liquid under pressure coupled to the first end of the cavity in juxtaposition to said presser whereby liquid under pressure is supplied through the aperture in said presser; d. an inner cylinder axially disposed in said die at the second end thereof; e. a plunger slidably coupled within a portion of said inner cylinder having at least a first passage at and end thereof axially disposed in said plunger and at least a second passage integral with said first passage and transversely aligned through said plunger, the end of said plunger being adapted to abut and be received by the second end of the pipe; f. a chuck concentrically coupled about said plunger and having a radial face in axial opposition with a corresponding radial face of said inner cylinder, said second passage being intermediate the radial faces of said chuck and said inner cylinder whereby liquid under pressure is forced through said first and second passages urging said plunger and coupled chuck against the pipe; g. an outer cylinder coupled to said plunger having a tapered hollow adapted to receive said die members; and h. moveable means for moving said outer cylinder axially to fasten said die members comprising an axle secured to and disposed transverse said outer cylinder, guide rails in parallel spaced relation to the axis of said die members, and wheels pivotally supported upon said axle and adapted to be rollingly received by said guide rails.

Claim 8

A pipe bulging apparatus comprising: a. a split die having two separate die members pivotally coupled to each other at an end thereof and having complementary axial cavity portions therein for holding the pipe and a recess corresponding to the bulge to be disposed in the pipe, said cavity having first and second ends; b. a presser coupled within the first end of said cavity having an aperture axially disposed therethrough and an axial end thereof adapted to abut and be received by the first end of the pipe; c. hydraulic generating means for supplying liquid under pressure coupled to the first end of the cavity in juxtaposition to said presser whereby liquid under pressure is supplied through the aperture in said presser; d. an inner cylinder axially disposed in said die at the second end thereof; e. a plunger slidably coupled within a portion of said inner cylinder having at least a first passage at and end thereof axially disposed in said plunger and at least a second passage integral with said first passage and transversely aligned through said plunger, the end of said plunger being adapted to abut and be received by the second end of the pipe; f. a chuck concentrically coupled about said plunger and having a radial face in axial opposition with a corresponding radial face of said inner cylinder, said second passage being intermediate the radial faces of said chuck and said inner cylinder whereby liquid under pressure is forced through said first and second passages urging said plunger and coupled chuck against the pipe; g. an outer cylinder coupled to said plunger having a tapered hollow adapted to receive said die members; and h. moveable means for moving said outer cylinder axially to fasten said die members comprising an axle secured to and disposed transverse said outer cylinder, guide rails in parallel spaced relation to the axis of said die members, and wheels pivotally supported upon said axle and adapted to be rollingly received by said guide rails.