US1775762A - Means and method for bending pipe - Google Patents

Description

Sept. 16, 1930. HARVEY 1,775,762

MEANS AND METHOD FOR BENDING PIPE Filed Feb. 25, 1926 2 Sheets-Sheet l INVENTOR W'- a; B

ATTORNEYS Sept. 16, 1930. H. E. HARVEY MEANS AND METHOD FOR BENDING PIPE Filed Feb. 25, 1926 2 Sheets-Shut 2 I I I l l l l I I I I I I I I INVENTO r/hfi A ORNEYS Fig-4 Patented Sept. 16, 1930 UNITED STATES PATENT OFFICE HARRY E. HARVEY, 0F CLEVELAND, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO STEEL AND TUBES, INCL, OF CLEVELAND, OHIO, A CORPORATION OF OHIO MEANS AND METHOD FOR BENDING PIPE Application filed February 25, 1926.

This invention relates to apparatus for bending pipes and the like. It more particularly relates to apparatus for forming the pipe or the like into a predetermined curve. I i

An object of the invention is to provide a method and apparatus for bending pipe which will prevent the pipe from flattening or buckling when the bend is made.

Other objects and advantages will hereinafter appear.

This application is a continuation of my copending application, Serial No. 729,077, filed July 30,1924, as to all matter common to both applications.

The invention, as well as its objects and advantages, will be better understood from the description of one practical embodiment thereof which is shown by way of illustration in the accompanying drawings, in which-'- Fig. 1 is a side elevation of a machine provided with bending dies which constitute one embodiment of my invention;

Fig. 2 is a'plan view on a larger scale of a part of the machineshown in Fig. 1 with the dies separated;

Fig. 3 is a view similar to Fig. 2 but on a still larger scale and showing the dies in a partly closed position; and

Fig. t is a cross section on line H of Fig. 3. a

The apparatus shown is designed to form a pipe into a compound or ogee curve and consists of suitable'dies and a machine for operating them.

The drawings represent the bending dies 1 and 2 as applied to a bulldozer machine. The machine comprises a bed 3 carrying a stationary abutment 4 and a horizontally reciprocating crosshead 5 which is driven from an external source of power through reduction gearing 6, cranks 7 and rods 8.

Die 1 is illustrated as being'held stationary by being fastened to the abutment while die 2 is attached to the crosshead and reciprocated thereby along the top of thebed, to and from the stationary die. As the dies shown are intended to form a compound bend in the pipe, the bending faces are in Serial No. 90,457.

the form of an ogee curve, the convex portion 9 of the stationary die being opposite and complementary to the concave portion 10 of the movable die, and the concave portion 11 of the stationary die being opposite and complementary to the convex portion 12 of the movable die. The faces are provided with semicircular grooves l and 2* for the reception of the pipe.

A plunger 13 is provided-in concave portion 10 of the movable die and is urged outward by spring 14, normally extending as far as the depth of the concavity of the die. The concave portion of the stationary die is provided with a similar plunger 15 urged outward by spring 16. The springs are stiff enough to bend the sections of the pipe contacted by the plungers, so that the plungers touch the die faces" opposite before the springs yield. Consequently, the plungers give theportions of the pipe which they contact its complete bend before any other portions are bent, and thereafter clamp these portions tightly against the dies, holding them thus throughout the remainder of the bending operation.

As the dies are moved together, the unclamped portions of the pipe nearest the plungers are first bent about the convex portions of the dies, and as the dies ap roach each other increments successively rec ding from said plungers are bent until the dies touch when the entire bend has been formed.

It will also be seen that as the dies are moved together, after the plungers have gripped the pipe, thedistance between the grippedportions is increased, maintaining the intermediate portion under tension while the bend is made, there being a localized stretching of the pipe during the bending operation as well as a slight longitudinal sliding of the pipe past theplungers. This tension probabl helps in preventing the pipe from buckling but the bending of relatively short portions at any one timeand the supporting of those already bent are probably mainl responsible for preventing deformation.

The die may be formed in any suitable or convenient manner. As shown in Figs. 3

'die. A bar 30 is provided with screws for adjusting the tension of springs 14 and 16.

Of course, for making longer or sharper bends, the dies may be provided with groups of a plurality of plungers arranged so that the certain plungers of each group engage the pipe first and adjacent plungers are successively brought into engagement. Many other modifications and variations will readily become apparent to those skilled in this art and I, therefore, do not limit myself to the precise embodiment shown but claim as my invention all embodiments coming within the scope of the appended claims. Other methods of actuating the plunger besides springs may be used Without departing from the spirit of this invention. For instance air or other fluid pressure could be employed.

I claim:

1. A pipe bender comprising two relative ly movable, complementary dies each provided with a concave portion, said dies being provided in their adjacent faces with grooves for receiving the pipe to be bent and spring pressed plungers extensible from the concave "faces of each die.

2. A pipe bender comprising two relatively movable, complementarydies with undulant pipe engaging surfaces, and spring pressed plungers extending from the trough of each undulation of each die.

3. A pipe bender comprising two relatively movable, complementary dies with undulant pipe engaging surfaces, and spring pressed plungers extending from the trough of each undulation of each die, said plungers normally extending into alignment with the tcirests of the undulations of their respective 4. A pipe bender comprising a bed, an abutment carried thereby, a crosshead reciprocating on the bed, two complementary dies,

one secured to the abutment and the other to the crosshead, each die having a sinusoidal working face, the concave portions of the faces having extensible, spring pressed sections. 5. A pipe bender havin sinusoidal fixed and mova le dies between which pipe is bent, and means extending from each die to resiliently engage the pipe and hold it against the convex portions of the opposite die during bending.

6. A pipe bender having complementary 8. The method of bending pipe which comprises tightly gripping and slightly bending the empty pipe at a plurality of spaced points simultaneously, then maintaining the grip, and simultaneously bending the pipe intermediate and outside said points.

9. The method of bending pipe which comprises clamping the pipe in recesses of relatively movable dies at spaced points and then moving the dies longitudinally together to bend the pipe between said points into conformity with the configuration of the die recesses.

10. The method of bending pipe which consists of successively and completely bending increments thereof from the crests to the nodes of the finished bends.

11. The method of bending pipe which consists of gripping and bending the pipe for short distances at spaced points and then relatively moving the gripping means in paths substantially transverse to the pipe thus bending the pipe intermediate said points while maintaining it under tension.

12. The method of bending pi e which consists of bending short lengths o the pipe completely and thereafter bending the pipe between said short lengths.

13. The method of bending pipe which comprises gripping the pipe by movable protruding die portions against rigid opposing die faces, and then moving the dies together to bend the pipe between the die faces.

In'testimony whereof I hereunto afiix my signature this 11th day of Februar 1926.

HARRY E. HA VEY.

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