Showing papers on "Bend radius published in 1971"

Plastic pipe bending jig

Abstract: A process and jig for field bending relatively large diameter plastic pipe, the jig being to guide the pipe at the point of tangency adjacent the bend after the pipe is heated and bent to form a smooth curvature to the desired radius and degree of bend as determined by the jig. The jig includes a two-piece spreader tube and a right and left hand guide, each adjustable in width, angle and spacing. The guides are U-shape and extend beneath the spreader tube so that the pipe may be placed on a flat horizontal surface. Each guide is provided with a protractor, one of which includes an offset scale so that offsets or curves with generally parallel tangents may be formed. The spreader tube includes a scale to ascertain the chord in terms of the radius for given degrees of bend.

Process for multiple bending of rods and a bending machine for carrying out this process

Abstract: The multiple bending of rods or other elongated elements into loops in which a rod (or rods) is supported on an abutment and is bent by means of a bending tool which is guided on a circular path around a bolt which determines the bending radius. The rod (or rods) which is to be bent is held by a clamping element which is fixed in relation to the rod (or rods) at least before the individual bends whereby before each individual bend a straight line distance between the bending tool of the bending machine and the clamping element is reduced, by means of a drive, by the length of the loop side piece required for the next single bend.

Combination tube form bend and inflation application

Abstract: An apparatus for embossing and bending metal strip having a pattern of stop-weld material sandwiched within it, with at least a portion of the stop-weld material corresponding to at least one inflatable fluid passageway. The apparatus comprises a spindle whose operative surface is contoured to provide the desired bend radius. The apparatus further includes means for embossing the strip and means for bending the strip about the spindle. Alternative embodiments include the use of a rubber spindle and combined means for bending and embossing the strip.

Apparatus for bending elongate objects

Abstract: The apparatus for bending tubes and like elongate objects is of the type in which a narrow transverse zone of the progressively and gradually forward driven tube is heated and in which bending is effected by means of a rotatable bending arm to which the tube is clamped, the center of rotation of the bending arm being situated substantially in the plane of the heated zone of the tube. In order to alleviate some of the forces acting on the tube and on the apparatus the latter is constructed so as to allow a limited movement of the center of rotation of the bending arm and of the heated zone of the tube in relation to each other. Deviations in the bend radius are corrected by displacing the means for heating the tube.

Coil of continuous elongated material

Abstract: A coil made of a continuous piece of elongated material such as tubing, prebent into pancake-like spirals called radial layers, each radial layer made up of several concentric and coplanar convolutions, with several radial layers stacked axially, and method and apparatus for making such coils. The material is bent prior to coiling at predetermined bending radii which are different for different convolutions within a radial layer. One or more of the convolutions within each radial layer may be bent at constant bending radius; the rest may be bent at gradually changing radii. The bending radius is controlled by an electric and hydraulic network employing both timed and feedback controls. The coil may be built either upwardly, with the most recently made radial layer always at the bottom of the coil, or it can be built downwardly, with the most recently made radial layer always on the top of the coil.