US1840317A

US1840317A - Method of and machine for forming radiator elements

Info

Publication number: US1840317A
Application number: US231364A
Authority: US
Inventors: Horvath Geza
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-11-05
Filing date: 1927-11-05
Publication date: 1932-01-12
Anticipated expiration: 1949-01-12

Description

G. HORVATH 1,840,317

METHOD OF AND MACHINE FOR FORMING RADIATOR ELEMENTS Jan. 12, 1932.

Filed Nov. 5. 1927 I5 Sheets-Sheet Jan. 12, 1932. G HORVATH 1,840,317

METHOD OF AND MACHINE FOR FORMING RADIATOR ELEMENTS Filed MW. 5, 1927 5 Sheets-Sheet 2 8 wuzmto'c E'eza Harmih WW Jan. 12, 1932. a. HORVATH 1,340,317

I METHOD OF AND MACHINE FOR FORMING FADIATOR ELEMENTS Filed Nov. 5. 1927 5 Sheets-Sheet 3 lllllljllllll E'azaMrzraflz 4 I r/ I Patented lan. 12, 1932 UNITED STATES GEZA HORVATH, OF HIGHLAND PARK, MICHIGAN METHOD OF AND MACHINE FOR FORMING RADIATOR ELEMENTS Application filed November 5, 1927. Serial No. 231,364.

The present invention relates to the art of making radiator elements of the type wherein a ribbon is wound spirally on a tube, and is an improvement on my prior Patent No. 1,472,719, of October 30, 1923.

The principal object of the inventlon is to improve the contact between the rlbbon and the coil, whereby the efficiency of the element is increased. Incidently, the invention provides a-firmer engagement between the ribbon and the tube to such an extent that an auxiliary means such as solder need not be used in certain cases.

In present radiator elements of this general construction, the crimping of the coil 1mparts a curvature thereto, but the radlus of this curvature is greater than the external radius of the tube and consequently there is a tendency for the ribbon to unwind from the tube. This situation requires the use of solder as already indicated, and it is further necessary to employ dead soft metal in order to avoid resiliency which would further tend to draw the ribbon away from the coil. S'uch soft metal is unsatisfactory because it easily becomes damaged in shipping and handling.

These difficulties are overcome by the present invention according to which the corrugaao tions are ironed out and the ribbon flattened along one edge thereof. The curvature imparted to the metal by the crimping operation is considerably diminished by the ironing or pressing operation, and the final curvature is such that the ribbon may be wound snugly on the tube and adhere thereto without the use of solder. The pressing operation is conducted in a manner to stretch the metal at the flattened edge, and this fact contributes to the reduction in the radius of curvature of the ribbon. Also, spring metal may be used since the tendency of the ribbon to unwind from the tube is overcome. The flattening of the ribbon along its convex edge permits a larger air space and hence a greater air capacity between the convolutions than if the ribbon were corrugated from edge to edge.

The invention is fully disclosed by way of 7 example in the following description and in the accompanying drawings, in which Figure 1 is an end View of the machine; Fig. 2 is a plan view thereof; Fig. 3 is a side elevation; Fig. 4 is a detail perspective View of the ribbon after the crimping operation;

Fig. 5 is a detail section through the pressing rolls;

Fig. 6 is an enlarged detail elevation of the crimping rolls; and v Fig. 7 is a section on the line 7-7 of Figure 6.

Reference to these views will now be made by use of like characters which are employed to designate corresponding parts throughout.

On the frame 1 of the machine is mounted an upright bracket 2 having legs 3 and 4 secured upon the frame by bolts 5. At the upper end of the bracket are journaled a pair of juxtaposed guide rolls 6 and 7 slightly spaced from each other in order to engage the faces of a ribbon 8 passed therethrough. At the lower end of the bracket is mounted an arm 9 on a pivot pin 10. This arm carries a rotatable crimping roll 11 consisting of a beveled toothed member as shown in ures 2 and 3. Adjacent the roll 11, the bracket 2 is thickened at 12 to the extent of the width of the arm 9 in order that a similar crimping roll 13 pivoted to this portion will mesh with the roll 11. A finger 14 extends from the arm 9 over the thickened portion 12 which further supports a pair of springs 15 received in sockets 16 in the finger piece. These springs tend to draw the roll 11 towards the roll 13, and the movement of the roll 11 is limited by a set screw 17 threaded therethrough and engaging the vertical wall of the thickened part 12. By means of this screw the spacing of the rolls 11 and 13 may be adjusted for various thicknesses of ribbon passed therethrough. After the ribbon has passed between the rolls it is formed with transverse corrugations 18 which reduce in depth towards one edge due to the beveled character of the rolls, as shown in Figure 4, whereby the ribbon is somewhat curved.

The frame 1 has a face 19 which slopes ed to engage the corrugate ribbon 8 as it comes from the crimping rolls at the edge at which the corrugations 18 are narrower. The

details of the pressing rolls will presently be described. v r

In a bearin 22 upon the frame 1 1s mounted one end 0 a shaft 23, the prolongation of which lies adjacent the rolls 21. A screw 24 is-splined as at 25 upon the shaft 23 and is threaded through a nut 26 mounted upon the frame 1. The outer end of the shaft carries a gear 27 by which it is driven, and the inner end of the screw is equipped with a collar 28 into which one end of a tube 29 may be secured by a set screw 30. It will be ap parent that the ironing or pressing action of the rolls 21 upon the ribbon tend to form the latter into a helix, the axis of which coincides substantially with the axis of the tube 29, so that the ribbon is-wound upon the tube as it is delivered from the crimping rolls. P

Upon the frame is mounted another block 31 carrying a pair of pressing rolls 32 similar to the members 21 for engaging the flattened ed e of the ribbon at another point.

ince both pressing units are identical, a detailed description of only one will be necessary. The block is formed with slots or gecesses 33 and 34 in which are pivotally mounted

arms

35 and 36 respectively which carry the pressing rolls. The block has a further recess 37 in communication with the slot 34 for receiving one end of a spring 38. Through the lower end of the arm 36 is threaded a screw 39 carrying a disk 40 engaging the remainin end of the spring. This arrangement ten s to move the pressing roll carried by the arm 36 into engagement with the ribbon, and the tension of the spring may be regulated by the screw 39. The lower end of'the other arm 35 carries a set screw 41 engageable with the central part of the block, thereby limiting the outward movement of the remaining roll against the roll under spring pressure, and further providing a means for adjusting the final position of the arm 35 and roll carried thereby. The peripheries of the rolls are formed each with two surfaces 42 and 43 angularly disposed to each other as clearly shown in Figure 5.

I The surfaces 42 come into firm contact with a portion (if the ribbon at opposite sides thereof along one edge and press the corru- 1s partlcularly desirable in automobile work.

gations out of the ribbon at this region. Further, the adjustment of the presser rolls is*such that the surfaces 42 will engage the ribbon with suflicient pressure to reduce the thickness thereof as shown in Figure 5 and thereby stretch the same. This stretching of the metal, which is approximately twentyeight percent, along one edge causes the ribbon to coil, and the adjustment of the parts is such that the ribbon will snugly engage the outer wall of the tube 29. The corrugations to be retained at the other end are accommodated in the space between the anularly disposed faces 43. The presser rolls urther temper .or' harden the metal while ironing the same.

It is preferred to perform the pressing and stretching operation in two stages at the rolls 21'and 32, as this second stage reduces the radius of curvature to such an extent that the ribbon binds tightly on the tube. In fact, the ribbon is so tight on the tube that it leaves a mark thereon. This is decidedly superior to the; results obtained according to my previous patent identified above, wherein the coiled ribbon has a tendency to unwind from the tube when the product is placed in the solderin bath. In the present instance solder is a so used between the ribbon and the tube but rimarily to fill the air spaces. It is nevert eless possible to use but a single pair of rolls properly adjusted for the purose.

As will be understood, the initial transverse crimping of the ribbon'is changed by the action of rolls 21, the latter serving to reduce the depth of the crimps of the previously applied fin, the rolls acting on the outer or peripheral zone of such fin. The initial crimping thus produces what may be considered as an embryo fin formation which is applied to the tube in such embryo stage of development, and then ailixed by the succeeding action of rolls 32.

The tube 29 is moved on its own axis and axially of the coiled ribbon by the action of the screw 24 in the nut 26. If the initial end of the ribbon is attached to the forward end of the tube as at 44, the axial movement of the tube is suflicient to draw the ribbon through the several pairs of rollers without the use of an auxiliary feeding device.

The process of the invention may be performed on a lathe or any machine for feeding or turning the tube, or simply by turning the tube and feeding the ribbon lengthwise, it being understood that the invention resides principally in the flattening of the ribbon at one edge and retaining the corrugations in the other edge.

It will now be apparent that the several alleged advantages of the invention are made possible by the method and means described herein. It might be added that the absence of solder for securing the ribbon to the tube Although a specific embodiment of the invention has been illustrated and described, it will be understood that various alterations in the details of construction may be made without departing from the scope of the invention as indicated by the appended claims.

What I claim is: i I 1. A method of applying metallic ribbon on a tube to form a radiator element, which other roll varies transversely of said rolls, and consists in crimping the ribbon transversely a pair of opposed ressing rolls under presthroughout its width to produce a spiral emsure against each ot er and adapted to receive bryo fin formation appliable about the tube between them one edge of a ribbon which has spirally, locating the embryo formation in be predetermined positions spirally on the tube, and aflixing the embryo formation to the tube by reducing the crimp depth of the peripheral zone of the positioned formation by pressure application to the opposite faces of the fin in such zone.

2. A method of forming radiator elements consisting in crimping a ribbon transversely by producing transverse corrugations therein of diminishing depth from one edge of the ribbon to the other, whereby to form a concave edge where the corrugations are deeper and a convex edge where the corrugations are shallower, winding said ribbon on a tube, and pressing out the corrugations at the shallower ends thereof.

3. A method of forming radiator elements consisting in crimping a ribbon transversely by producing transverse corrugations therein of diminishing depth from one edge of the ribbon to the other, whereby to form a concave edge where the corrugations are deeper and a convex edge where the corrugations are shallower, pressing out the corrugations at the shallower ends thereof, winding said ribbon on a tube and stretching the ribbon at the shallower ends of the corrugations while pressing out the latter.

4. In a machine for forming radiator elements, a crimping means for metallic ribbon, said means being adapted to provide a spirallike ribbon formation, means for positioning the formation about a tube, and means including a pair of opposed pressure rolls relatively yieldable and operative on the positioned formation to reduce the crimp depth of the peripheral zone of the formation and thereby tighten the positioned formation to the tube.

5. In a machine for forming radiator elements, a pair of meshed, toothed rolls arranged so that the extent of penetration of the teeth of one roll between those of the other roll varies transversely of said rolls, and means for stretching one edge of a ribbon which has been passed betwr en said toothed rol s.

6. In a machine for forming radiator elements, a pair of bevelled, toothed crimping rolls arranged in mesh and with corresponding faces parallel, whereby the extent of penetration of the teeth of one roll between those of the other roll varies transversely of said rolls, and means for stretching one edge of a ribbon which has been passed between said crimping rolls. V

7. In a machine for forming radiator elements, a pair of meshed, toothed rolls arranged so that the extent of penetration of the teeth of one roll between those of the en passed between said toothed rolls. In testimony whereof I afiix my si ature.

GEZA HORV TH.