Metal deforming – By use of roller or roller-like tool-element – Comprising tool movable relative to stationary work-portion...
Patent
1981-09-21
1983-09-20
Crosby, Gene
Metal deforming
By use of roller or roller-like tool-element
Comprising tool movable relative to stationary work-portion...
72388, 7245315, 72457, B21D 300
Patent
active
044048335
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for straightening of pipes, especially for straightening of bent, tubular road sign posts.
For straightening of bent pipes a device is used that comprises two bases placed on each side of the bend on its outside. This device can not be used for straightening of bent road sign posts, where the bend is near the surface of the earth.
The purpose of this invention is to present a device to meet this disadvantage.
This is achieved when the device comprises a base in two parts to span the bent pipe on one side of its bend, which base is connected to one end of at least one bar, the other end of which is pivotally fastened to a piston rod in a working cylinder, which is pivotally fastened to a corner of a triangular straightener, another corner being pivotally fastened to one part of the base, and the side opposite this corner being the basis for a thrust block or roller arranged in a way that allows this to press against the other side of the bend of the pipe. Thus, the device can be easily placed on a pipe that is to be straightened. The base is placed immediately under the bending, and thus bends close to the earth can be straightened.
The device can be characterized in that the bars are pivotally fastened on opposite sides of pipe gripping tight-fitting thrust pads of the base, and that the bars are connected to the piston rod at the same point, the lengths of the bars being fitted to allow the thrust pads to squeeze the pipe, as the bars form an acute angle to each other. This embodiment is especially appropriate, as the base in two parts automatically tightens round the pipe when activating the working cylinder of the device.
Finally, the device can be characterized in that the thrust block or roller can be fastened to the side of the triangular straightener that is opposite the corner where the triangular straightener is connected to the base at different distances from the third corner of the triangular straightener. By this means, heavily bent pipes can be straightened, even if a working cylinder with a limited length of stroke is used.
The invention will be further explained with reference to the drawing, showing an embodiment according to the invention, seen from the side.
The device consists of a triangular straightener frame 7, 14, 15, to the lower corner 6 of which a thrust pad 3 is pivotally fastened to fit tightly against a pipe 1 at the inside of the bend. At the other corner 8, a pneumatic or hydraulic working cylinder 9 is pivotally fastened, the piston rod 10 of which is pivotally fastened to two sets of bars 11 and 12. One set of bars 11 are at the other end fastened pivotally to the corner 6 and the base 3. To the other set 12, another thrust pad 2 is mounted, pivotally too, at the other end thereof, by connector 16 to fit tightly against the pipe 1 at the outside of the bending. Finally, a pressure element in the form of a thrust roller 5 is mounted on one side 7 of the triangular straightener. This thrust roller 5 can be moved between several positions 13 at different distances from the corner 4.
The device functions in the following way. The base 2, 3 in two parts is placed round the pipe 1 immediately below the bend so that the thrust roller 5 abuts the pipe 1 above and at the inside of the bending. When activating the working cylinder 9, the thrust pads 2 and 3 are pressed firmly round the pipe 1, whereupon the triangular straightener turns about the corner 6, the thrust roller 5 transmitting the straightening power from the working cylinder 9 to the pipe, which is then straightened, as the necessary reaction against the pipe 1 is transmitted through the thrust pad 2. It will be appreciated from the foregoing, with reference to the drawing, that the reaction force at thrust pad 2 acts to press same in a direction away from the straightener (leftward in the drawing) so that bars 12, with interconnecting member 16, form a tie structure for holding thrust pad 2 against this force. On the other hand, bars 11, which are pivotally connected to thrust pad 3 an
REFERENCES:
patent: 1268844 (1918-06-01), Holinger
patent: 3353393 (1967-11-01), Goodwill
patent: 3584493 (1971-06-01), Crees
patent: 3765219 (1973-10-01), Easom
patent: 3786668 (1974-01-01), Crees
patent: 3861186 (1975-01-01), Wigner
patent: 4026138 (1977-05-01), Miller
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