US2288273A

US2288273A - Method for forming heating coils

Info

Publication number: US2288273A
Application number: US304984A
Authority: US
Inventors: Winford L Enghauser
Original assignee: PRODUCTION PLATING WORKS Inc
Current assignee: PRODUCTION PLATING WORKS Inc
Priority date: 1938-12-05
Filing date: 1939-11-17
Publication date: 1942-06-30
Anticipated expiration: 1959-06-30

Description

Je 36', 1 w. L. ENGHAUSER 3 METHOD FOR FORMING HEATING COILS Original Fil ed Dec. 5, 1938 3 Sheets-'Sheet 1 INVENTOR.

Jame 30, 1942. w. L. ENGHAUSE-R 2,288,273

METHOD FOR FORMING HEATING COILS Original Filed Dec. 5, 1938 5 Sheets-Sheet 2 57 INVENTOR. 4474 12 We Wm? ATTORNEYS June 30, 1942. w. L. ENGHAUSER METHOD FOR FORMING HEATING COILS Original Filed Dec. 5, 1938 3 Sheets-Sheet 3 BY W igs v.

WM'WATTORNEYJ k gum" Patented June 30, 1942 2 UNITED STAT 2,288,273 7 METHOD FOR FORMING HEATING ooiLs Winford L. Enghauser, Cincinnati, hio,.assignor to The-Production Plating Works, Inc; Lebanon, Ohio, a corporation of Ohio I Original application December 5, 1938, Serial ,No.

243,908. Divided and this application November 17, 1939, Serial No. 304,984

7 1 Claim. 01. 153-33) This invention relates to the art of bending or Figure 7 is a sectional view taken on line 1-1,. forming lengths of tubing and isparticularly di- Figure 5, further detailing the release mecharected to a method of bending a length of pipe nisrn. into the form suitable for a water coil, specifical- Figure 8 is a sectional view taken on line 8--8, 1y providing a reversely bent length of tubing 5. Figure 1, detailing a portion ofthe lower die. having parallel runs and adjacent terminal Generally described,the apparatus consists of ends. It is desirable to extend the amount of a stationary die having a' ro'cking'die pivoted passageway so that the water has a greater thereon, and an upper die adapted to descend travel in the zone of heat. For this reason, upon the pipe for forcing the pipe between the the tube is bent so as to provide an enlarged or 10 stationary die and the rocking" die and causing flared bight. the rocking die, by virtue of its rock-ing motion,

The formation of a coil of this shape presents to form the coil around the forming wheel of unusual problems in the art of bending. One the descending die. of the first considerations is reduction in the Specifically referring to the drawings, the apnumber of steps required in the formation. The paratus consists of a base or pedestal Ill. The coil must sell inexpensively and it is therefore lower die support or continuation of the base is desirable that the number of steps be reduced indicated at H. The stationary die I2, is fitted to a minimum to save costs of production. Also in a recess in the inner side wall of the throat the tubing must be supported efiiciently during l3 of the die support II. Specifically, the die elethe bending so as to' prevent wall collapse. ment I2 consists of an angular base, the top arm It has been the object of the present inventor of which rests on the top surface of the die supto provide a method of bending a length of tubport. This die element is removable for intering into a complete coil of the general shape changementl- A separate-die element for each herein described. It is a further object to acsize of tubing is employed. A semi-circular complish the formation of the coil in a single groove [4, formed on the radius of the particuoperation or pass. A structure, used in this lar tubing, extends along the top arm and the method, mayconsist of a throated die, including side arm of the die and feathers out at the base a rocking die actuated by the motion of a deof the vertical arm. scending forming die as it passes into the throat A bracket i5, for supporting the length of the of the lower die for bending the pipe around the pipe, is fixed against the side of the support forming element of the descending die to form and provides a horizontal arm, the top surface the enlarged bight and for disposing the runs in of which lies in the plane of the base of the close proximity. semi-circular groove I4. This arm has a stop This application is divisional of my previously l6 adjustably fixed thereon by means of a set filed application, Serial No. 243,908, filed Descrew ll. The length of tubing, indicated at l8, cember 5, 1938, directed to apparatus for formhas one end engaged against this stop It. ing the coil. The rocking die I9 is constituted by a bell Other objects and certain advantages Will be crank,'which is pivoted on a pivot pin 20. One more fully apparent in a description of the acarm of the bell crank extends upwardly and companying drawings in which: 40 carries a forming wheel 2|, which includes a Figure 1 is the front view of the coil forming semi-circular groove 22, formed on the radius apparatus of this invention. of the particular tubing, wherein the wheel is Figure 2 is a fragmentary view taken similar in the form of a sheave. When this wheel is in to Figure 1 but showing the apparatus in posiupward position, the straight length of pipe will tion after forming the length of tubing into a rest tangentially in the groove since the base of coil. the groove is in the same plane as the base of Figure 3 is a side view of the apparatus. the groove of the stationary die.

Figure 4 is an enlarged sectional view taken The horizontal arm of the bell crank carries on line 44, Figure 1, illustrating the details an actuating wheel 23. This wheel is grooved in of the top die. the same manner as the wheel 2|. The wheel Figure 5 is an enlarged fragmentary view of a is disposed directly in the path of the descending portion of Figure 3, further detailing the die. die or, more specifically, the pipe pressed down- Figure 6 is a view taken similar to Figure 5, wardly under the die. The bell crank is held in but showing the release mechanism thereof opthe position as described above by means of a coil erated for removing the finished coil. to spring 24 under tension between a pin 25 on the vertical arm and a pin 26 fixed on a stop element 21 attached to the side of the support ll. Thebell crank carries a stop 28 engaged with stop 21 when the rocking die is in position prior to descent-of the upper die.

The details of the die actuating mechanism are not shown since they are conventional. The lower end of the ram 29 includes an attachment fiange 30. The carrier bracket 3| for the upper forming wheel 32, includes an attaching flange 33 corresponding to that of the ram and attached thereto by means of screws 34. The downwardly extending portion of the bracket 3| includes the forming wheel 32 attached against its side by means of a stud 35. The forming wheel 32 is of the same type as the Wheel 2i but is split centrally of its thickness, that is, at right angles to its axis. The stud is fixed rigidly in position and the wheel sections are loosely mounted on the stud.

The outer section 36 of the wheel is shiftable along the stud by means of a lever 31. The handle 38 of the lever is screwed into one arm of a bell crank 39, which is bifurcated and pivoted on the outer end of the stud 35 on a pin 40. The other arm of the bell crank is connected to the wheel by means of a link 4|. For this purpose, the wheel section 36 includes spaced ears extending longitudinally of the stud at each side thereof. The link elements 4! in each instance, are attached to the inner side of the ears 42 by means of screws 43. The screws afford a pivotal connection since they are screwed into the ears and loosely engage the links. The same arrangement is provided for attaching the links to the bifurcated arm of the bell crank, the screw, in this instance, being indicated at 44.

Thus, when the pivot 40 and the

screws

43 and 44 are aligned along the axis of the stud, the sections of the wheel are held together as indicated in Figure 5. In this position, inward movement of the lever 31 is limited by means of a set screw 46 traversing a cross piece 41 of the bell crank lever and held in position by means of a nut 48 whereby the set screw will engage the stud (see Figure '7) when the wheel is ready for the forming operations.

The ram is held in spaced relation with respect to the stationary die and against any spreading tendency by means of a roller 50 carried by an arm 5| fixed to the carrier for the upper forming wheel. This roller rides along the outer surface of a guide bar 52 fixed vertically to the rear face of the base II.

An adjustable stop 55 is fixed to the ram and includes a wheel 56 appropriately grooved and adapted to be engaged by the run of tubing when the ram reaches the lower end of its stroke for maintaining the formed run in strictly vertical position (see Figure 2).

When the forming wheel is in the position shown in Figure 6, the finished coil may be slid downwardly, assuming, of course, that the ram has been raised. The runs 51 of the coil are spaced sufficiently to permit traversal with respect to the stud 35.

Having described my invention, I claim:

The method of forming a pipe structure consisting of the steps of: supporting a length of pipe toward its respective ends, engaging the intermediate and unsupported portion of the pipe by means of a forming roll, moving said forming roll downwardly to produce a reverse bend while supporting one of the runs by a lateral supporting surface disposed parallel with the movement of the roll and spaced therefrom by the diameter of the pipe, maintaining said one run supported as aforesaid and further moving said roll downwardly and simultaneously exerting a bending force on the other run to bend it further about the roll to createan offset loop, and engaging said last named run above the roller during formation of the loop to obtain a predetermined spacing between the upper portions of the runs.

WINFORD L. ENGHAUSER.