US15086A - James reynolds - Google Patents

Description

N. PETERS, PHOTO LITHOGRAFHEH UNITED sTaTEs PATENT oEEoE.

JAMES REYNOLDS, OF NEW YORK, N. Y.

MAND-REL FOR MAKING GUTTA-PERCI-IA TUBING.

Specification of Letters Patent No. 15,086, dated June 10, 1856.

To all 'wh-0m t may concern Be it known that I, JAMES REYNOLDS, of the city, county, and State of New York, have invented a new and Improved Drawing Apparatus for Drawing and Equalizing the Size and Thickness of Gutta-Percha Tubing; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming part of this specification, in which- Figure l, is a vertical central section of the apparatus. Fig. 2, is a longitudinal view ofthe mandrel upon which the drawing is performed and the connecting rod thereof.

Similar letters of reference indicate corresponding parts in both figures.

This invention consists in certain means of providing for the convenient and speedy introduction of the mandrel to a long piece of tubing and the ready introduction of the tubing to the machine.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

C, is a standard to which is tted the stationary die D, D. This die is of circular form in its transverse section, and its sides, in a section taken in a plane passing through its axis, are of rounded form, as shown in Fig. l, its middle or smallest part being of the size to which the exterior of the tube is to be drawn. It is divided in a horizont-al plane passing through its axis into two parts D, D', the upper part of which, D', is made movable to enable the tube to be inserted, and when in operation this movable part is held down by a screw E, working in a female screw in the top of the standard C.

F, is the bulb headed mandrel the largest portion of which is of the size to which the interior of the tube is to be drawn, but this portion consists merely of a narrow [zone from the back of which the mandrel is rounded 0E and from the front of which it is tapered off to a shank, f. This shank is formed with an eye, 71 to connect the mandrel with the hooked end, g, of a long rod of iron G, which is considerably smaller than the mandrel and must be of a length equal to that of the tube when drawn. This rod, G, is intended to be screwed at the end farthest from the mandrel and furnished with nuts b, b, to secure it to a ixed stand Z, or some fixture attached to the floor, and

as the rod will be generally of a very great length, the rollers H, of which one is shown in Fig. l are placed in stands or bearings I, at suitable intervals apart to support it. The rod is so adjusted by its nuts b, b, that when the mandrel is attached, its largest part will be exactly within the smallest part of the die, which makes the entrance to the space between the mandrel and die, tapering both ways.

The operation of the apparatus is conducted in the following manner. Before commencing, the mandrel is unhooked from the connecting rod G, which remains permanently secured at the opposite end and rests upon the rollers H; and the die is opened by raising the screw E. The tube to be operated upon is in the state in which it has been cast. Its exterior is a little larger than the interior of the die, and its interior a little smaller than the exterior of the mandrel. One end of it is passed over the free extremity g, of the rod Gr, and the whole length of tube is threaded over the rod, which is easily done by simply pushing it forward by hand toward the iixed end. When the tube has been all threaded on to the rod leaving the hook y, protruding through it, the mandrel is placed in the die and hooked on to the rod and the tube is drawn back by hand over the mandrel far enough for its end to protrude far enough through the die to attach it to some suitable purchase which will generally be a pair of rollers which constitute part of an invention of mine for finishing the tubing. The top part of the die is then screwed down to its place and the power applied to draw the tube (which is shown in section in Fig. l, in red color) in the direction of the arrow. In drawing the tube, the mandrel serves as a support to the material against the action of the die, and the die as a support against the action of the mandrel, which causes the material to be compressed and condensed in the operation. The mandrel will always lind its place in the center of the die, so that the tube will be of equal thickness, and the tube will be reduced to the required size and to a perfect cylindrical form both externally and internally.

The bulb shape of the mandrel, the rounded form of the die, shown in Fig. l, and the position of the mandrel in the middle of a rounded die, are all found by experiment to be of great importance to the success of the drawing process and in the combination of these conditions the apparatus diiers from all other tube drawing apparatus known to me, and I believe this to be the first apparatus ever constructed to draw gutta percha tubing internally and externally. The construction of the mandrel with a short shank to attach it to and detach it from a rod long enough to pass through the whole length of the tube and small enough to allow the tube to be threaded over it when the mandrel is detached7 said rod being iXed at one end, is another condition very essential to the convenient operation of the machine,

S. H. WALES,

JAS. F. BUCKLY.

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