US2557737A

US2557737A - Disk cutter with bevelled and concave surfaces

Info

Publication number: US2557737A
Application number: US680344A
Authority: US
Inventors: George E Franck
Original assignee: Imperial Brass Manufacturing Co
Current assignee: Imperial Brass Manufacturing Co
Priority date: 1946-06-29
Filing date: 1946-06-29
Publication date: 1951-06-19
Anticipated expiration: 1968-06-19

Description

June 19, 1951 E, FRANCK DISK CUTTER WITH BEVELLED AND CONCAVE SURFACE Filed June 29, 1946 6607 6 zflmzcz Patented June 19, 1951 TH BEVELLED AND SURFACES DISK CUTTER WI CONCAVE George E. Franck, Riverside, Ill., Brass Manufacturing a corporation of Illino Imperial cago, Ill.,

assignor to The Company, Chiis Application June 29, 1946, Serial No. 680,344 4 Claims. (Cl. 7-141) A more particular object is to provide a new and improved tool which simultaneously performs two operations in the formation of a double flare on tubing.

Another object is to provide a tool which, as an incident to performing a tubing cutting-01f A further object is to provide a tubing cuttingoif tool having a cutting wheel one face of which is formed to turn inwardly the end of the tubing being cut.

lngs, in which:

Fig. 1 is a plan view of a tubing cutter embodying features of the invention adapting it for use in forming a double flare on tubing; 3, piece of tubing being shown in section.

Fig. 2 is a side elevational view of the cutter of Fig. 1.

Fig. 3 is an enlarged over forming wheel.

Fig. 4 is a view taken from the right in Fig. 3.

Fig. 5 is a view similar to Fig. 4 taken from the left in Fig. 3.

Fig. 6 is a very greatly enlarged radial sectional view of the cutting and forming wheel.

Fig. 7 is a view illustrating the partially formed tubing and means for performing a further operation in the flaring of the tubing.

Fig. 8 is a view similar to Fig. 7 showing the double flare completed.

While a double flare edge elevational view, somewhat Figs. 1 and 2, of the cutting and scope of the invention as defined in the appended claims.

In system wherein thin-walled tubing, such as that shown at ID in Figs. 1, 2, 7 and 8, is emplayed as, for example, in refrigeration systems, in the automotive etc., a piece not been marred, bent, etc., thereby facilitating the making of a fluid-tight coupling.

portion of a tubing being the part point of mechanical strength as well as from the standpoint of facility of eflecting a fluid-tight a portion H at the very end of the tubing is turned inwardly in the neighborhood of 40 from its original position to adapt it for being bent or folded back upon the straight portion of the tubing on the inner side thereof. While it is conceivable, as above stated, that the steps be performed entirely independently, it is contemplated that steps one and two will be performed somewhat simultaneously. Accordingly, as an incident to and at least following in immediate succession the cutting-off step, is the initial inturning of the portion i i.

In the third step, the portion II is turned further inwardly and then is folded back against the inner surfaces of the tubing Hi. The fourth and final step is to flare outwardly this portion ll of the tubing and a portion I! (see Fig. 8) which is slightly wider than the portion H. Here again, while it is conceivable that the portion Ii will first be completely bent back upon the tubing Ill,

.it is preferable that this bending back of the portion II and the outward flaring of that portion and the portion ll be performed in part, at least, simultaneously, for it will readily be appreciated that time and effort can be saved in that way. Herein the first and second steps of the method are disclosed as performed by a tool the particulars of construction of which were conceived to carry out the first two steps in this method, while the third and the fourth steps are carried out by the employment of a conventional flarin tool.

Referring now to Figs. 1 to 6, inclusive, there is disclosed therein a tubing-working tool devised to perform simultaneously a cutting-off and a partial forming operation, herein an inward flaring of the portion l I of the tubing. The tool comprises a generally C-shaped body member l3. At one end, the body member I3 is shaped or carries means to form a groove extending transversely of the body for the partial reception of a piece of tubing Ill to be operated upon. Herein a pair of rollers H are rotatably mounted at the one end of the body member and facing inwardly so as to form between them a groove for the partial reception of a piece of tubing 10. At the other end, the body member is bored in the plane of the member for the reception slidably therein of a bar l of a length to project out of the bore at both ends. The bar I5 is square and the bore likewise is square in transverse cross section so that the bar is held against rotation. At its inner end, the bar carries means designed to perform the first and second steps of the method as the bar is fed toward a piece of tubing supported between the rollers l4 and the tool as a whole is then revolved about the tubing. While the means for performing the first and second steps of the method may be formed directly on the end of the bar l5, preferably this means is a separate, removable element. To that end, the end of the bar I5 is formed with bifurcations l6 and rotatably mounted between the bifurcations is a cutting and forming element, herein a wheel l1.

As best seen in Figs. 3 to 6, inclusive, particularly Fig. 6, the wheel has a peripheral severing edge It. To avoid nicking of the edge l8, it is not formed as a knife edge but is given a slight width being on the order of .005 to .008 of an inch in width. This severing or cutting edge is located very near one side face or face plane of the wheel, as is clearly seen from Figs. 3 and 6, more particularly, the left side as viewed in those figures. From the edge l8 the side face is falls away very rapidly by means of a beveled portion 4 which forms an angle of approximately 10 to 15 with the plane of the wheel. the wheel thus performs a simple cutting-off operation. The portion of the wheel to the right of the severing edge It, still as viewed in Fig. 6, is, however, contoured to perform the second step of the method, namely, the turning in of the portion ll of the tubing. To that end, the surface 2| is formed as an are at least over the portion adjacent the severing edge I! and, herein, over the entire surface. It will be appreciated that this are will be comparatively small, in the order of one-eighth of an inch, inasmuch as the wheel has a thickness in the order of .134 of an inch and an outside diameter of approximately nineteen thirty-seconds of an inch. The center point from which the arc is struck lies in the plane of the side face I! of the wheel outwardly of the wheel so that a tangent to the surface 2| at the intersection with the face l9 does not exceed a right angle. Preferably, as herein, it forms a right angle. A tangent to are 2| at the severing edge I! forms, as best seen in Fig. 6, an angle of approximately 30 with a perpendicular to the axis of the wheel. As the severing edge it cuts into the tubing Hi, the curved surface 2| will, of course, turn the end of the piece of tubing engaged by it inwardly progressively as the wheel l1 moves progressively inwardly of the tubing. The result, of course, is that the portion l I of the tubing is turned inwardly, as best seen in Fig. 1,

with the outer surface, particularly, forming a true radius. The wheel i1 will, of course, be made of a suitable material, such as steel hardened so as to retain a cutting or severing edge.

When, as herein, the wheel I! has a cutting or severing peripheral edge I! of slight width, as distinguished from a knife edge, to protect it against ready nicking, there will be formed on one of the severed pieces of tubing, usually on the piece having the inturned portion II, a very thin burr l8 (see Fig. 1). It is, of course, not desirable that this burr remain on the piece of tubing and it is preferable, thereof, that the same be removed. Where the tubing is copper, bronze, or some other soft material, a few strokes of a file remove the burr l8 and at the same time give the piece of tubing ill at the inturned end a squared-oi! end, as in Fig. '7. Such a squared-of! end is desirable to assure the proper reaction of the tubing in the subsequent steps, more particularly, the inturning of the curved portion ll. Where the tubing I0 is of steel, the same procedure may be followed or the tubing may be clamped in a vise and the end having the burr I8 given a blow with a flat-faced object. This will break off the burr l8 and will also gattem or square the end of the tubing, as in On the body I: over the outer end of the bore in which the bar 15 slides, there is rotatably mounted a knurled knob 22. This knob has such engagement with the bar l5 that upon rotation of the knob the bar is fed toward or away from rollers l4 and any piece of tubing that may be resting in the groove formed by the rollers. The mode of use of a cutting-off tool is well known to those skilled in the art.

The tubing having now been cut off to the desired length and partially formed is now ready for the remaining two operations necessary to complete the formation of a double flare. As above stated, these operations herein are performed at least partially simultaneously. To that end, the tubing is now clamped between the bars 23 of any conventional flaring tool, one part of a fitting having customarily been slipped over the tube. The flaring tool yoke 24 is next brought into play and the screw 25 carrying the flaring cone 28 rotated so as to bring the cone into operative engagement with the end of the tubing. As the cone is forced gradually into the tubing, the portion II is first bent inwardly and, as the cone 26 continues to be forced into the tubing, is bent back upon the portion I! of the tubing. At some time during this bending of the portion i I, first further inwardly and then against the portion II of the tubing, the portion H and the portion l2 are bent outwardly to form the outward flare, the bars 23 of the flaring tool being properly countersunk for that purpose. Eventually, when the cone 26 reaches the position shown in Fig. 8, the portion II will be lying flat against the portion i2 and both portions will be flared outwardly, as shown in Fig. 8. Thus, by two simple operations, there has been formed a piece of tubing with a double flare. The flaring tool may now be removed and the tubing is ready for completion of the coupling operation by a uniting of the parts of the coupling.

I claim as my invention:

1. An element for use in a tool for working tubing comprising a wheel having a narrow, peripheral, severing edge, a beveled face at one side of said severing edge forming a small angle with a plane perpendicular to the axis of the wheel, and a concave surface at the other side of said severing edge intersecting the adjacent side face of the wheel, the curvature of the surface being such that a tangent thereto never exceeds a right angular position with respect to a plane perpendicular to the axis of the wheel.

2. An element for use in a tool for working tubing comprising a wheel having a narrow, peripheral, severing edge, a beveled face at one side of said severing edge forming a small angle witha plane perpendicular to the axis of the wheel, and a surface at the other side of said severing edge formed as an arc with the center of curvature of the are lying outside of the wheel 6 in the plane of the side of said wheel remote from the severing edge.

3. An element for use in a tool for working tubing comprising a wheel having a narrow, peripheral, severing edge, a beveled face at one side of said severing edge forming a small angle with a plane perpendicular to the axis of the wheel, and a concave surface at the other side of said severing edge intersecting the adjacent side face of the wheel, the curvature of the surface being such that a tangent thereto at the point of intersection of said surface and said adjacent side face forms substantially a right angle with respect to a plane perpendicular to the axis of the wheel.

4. An elementfor use in a tool for working tubing comprising a wheel having a narrow, peripheral, severing edge, a beveled face at one side of said severing edge forming a small angle with a plane perpendicular to the axis of the wheel, and a concave surface at the other side of said severing edge intersectiong the adjacent side face of the wheel, the curvature of the surface being such that a tangent thereto at any point forms an angle with respect to a plane perpendicular to the axis of the wheel falling in the range 30 to GEORGE E. FRANCK.

REFERENCES CITED The following references are of record in the flle of this patent:

UNITED STATES PA'I'EN'I'S