US1370074A - Method of and apparatus for bending tubes - Google Patents

Description

. A. VASSELLI.

METHOD OF AND APPARATUS FOR BENDING TUBES.

21. 2 SHEETS-SH Patented Mar.

\IIHHHI 1:

IIIAIIIII/ VIIIIIIIIII/tlllll APPLICATION FILED MAY 5,

A. VASSEL'LI.

METHOD OF AND APPARATUS FOR BENDING TUBES.

APPLICATION FILED MAY 5, i919- I Patented Mar. 1 1921.,

2 SHEETS-SHEET 2- Y .Znvenior and cheap apparatus composed of ANTHONY VASSELLI, 6F NEWARK, NEW EEBSEY, ASSIGNQR, BY ME$NE ASSIGN- MEETS, T0 HABEIMAN NATIQNALBANK GE THE CITY OF NEW YQRK, TRUSTEE.

HZETHGD Q1 AND APPARATUS FOR BENDING- TUBES.

specification of Letters Yatent.

Patented Mar. fr, 1%21.

Application filed May 5, 1919. Serial Ito. 294,705.

T 0 all whom it may concern Be it known that-I, ANTHONY VASSELLI, a citizen of the United States, and a resident of the cit of Newark, county of Essex, and State of iiew Jersey, have invented a certain new and useful Method of and Apparatus' for Bending Tubes, of which the following is a specification.

My invention relates to the bending of tubes for any use, and more articularly to the bending of tubes for use in manufacturing tone-arms for talking machines and the like.

The objects of my invention are the production of a method of and apparatus for the bending of tubes by the employment of a rigid and unbending core for preventing collapsing of the tubes, to produce a simple, few parts, of strong and rugged construction, which will not easily get out of order, and which may be operated by the simplest forms of machinery.

A further object is to provide an apparatus wherein tubes may be bent without the formation of wrinkles or cracks on the interior or outer surface of the tubes.

A further object is to provide a simple,

cheap and effective process of and apparatus forbending tubes, whereby the operations may be expeditiously carried out and waste eliminated.

A further object of the invention is the provision of means of the character herein described, which are simple in operation and construction, thoroughly reliable and eflicient in its purpose and operation, and inex ensive and economical to manufacture.

ith these and other objects in view to be more fully set forth hereinafter, the invention consists in the novel construction, combination of elements, and arrangement of parts which will be exemplified in the operation and construction hereinafter described in the specification and illustrated in the accompanying drawings considered to ether or separately.

he inventive idea involved is capable of receiving a variety of m'echanical expressions, one of which for the purpose of illustrating the invention, is shown in the accompanying drawings.

The invention will be first described in connection with the accompanying drawings, illustrating one embodiment of the invention, wherein similar reference characters are used to designate corresponding parts throughout the several Views, and then more specifically defined and indicated in the ap pended claims. I

In the drawings,

Figure 1 is a diagrammatic sectional view of an apparatus for carrying out my invention, the section being taken on the line indicated by 1-1 in Fig. 2;

Fig. 2 is a plan view of a portion of the device;

Fig. 3 is a view similar to Fig. 1, illustrating a further step in the process;

Fig. 4 is a similar view showing further step;

Fig. 5 is a detail side elevation showing a core member removed from the apparatus otfter the completion of the bending operaion;

Fig. 6 is a detail view showing the two core members in position to perform the bending operation, the section being taken on the line indicated b 6-6 in Fig. 5; and

Fig. 7 is a detail si e elevation of a portion of the reciprocating core member.

a still a relatively stationary mandrel or core member 1 and reciprocating mandrel or core member 2. The member 2 is preferably arranged toreciprocate vertically, and the axis of the member 1 is set at an angle to the axis of the member 2.

The member 1 is straight in its axial dimension, and of the cross sectional area and shape of the bore of the tube to be bent, and is carried on and forms part of a plate or head 3. The member 1 is provided with a shoulder 4 of the cross sectional area and shape of the outside of the tube to be bent. The member 1 is positioned between a pair of die members 5 and 6, each of which is provided with a recess which, when the die members are placed side by side with the portions of the opening. The shoulder 4- and retain the core member in position removed from the wall of the opening a distance equal to the thickness of the tube to be bent. The member 1 is ofsuch a length that its extremity 7 will be separated from the wall of the opening beyond the bend in the opening. That portion of the member 1 which is in opposition to outer wall of the bend of the opening is curved on the are of a circle struck from the same point as is the arc of the outer wall of the opening but of a radius less than the radius of the wall by a distance equal to the thickness of the material of the tube to be bent. In other words all portions of the member 1 are separated from the walls of the opening by a distance which will permit the tube to pass between the member and the walls.

The core member 2 is of cylindrical cross section. as is shown in the drawings, and is carriel by the reciprocating head 8 of an ordinary punch press. The diameter of the member 2 is the same. as that of the bore of the tube to be bent.

Carried by a plate 8 on the head 8 is a hollow punch core member 2, of the same cross sectional area as the tube to be bent. The core member extends through the hollow punch member and into a recess 10 in the head 8 and is backed by a heavy spring 11 whereby the core member may be moved relatively to the hollow punch member and head in the direction longitudinally of the member 2. The core member 2 is provided with a longitudinalslot or key way 12 which is engaged by the extremity of a set screw 13 carried by the head 8, to prevent rotation. of the member 2 but permit of its longitudinal movement relatively to the head.

The lower extremity of the member 2 is bev'eled, and the bevel face 14 is at the same angle sothat the die member 1 is positioned member 1.

to the axial plane of the member 2. p

The beveled end of the member 2 is concaved, as shown, and the radius of the con-. cavity is e ual to the radius ofthe core Whenthe members 1 and 2 are in operative position, the concave end of the member 2 will fit over that portion of the member 1 which is beneath the member 2 and a solid angular structure will be formed in the die and separated from the wall thereof a distance equal to the thickness of the tube to be bent.

The angle which the leg 15 of the die opening 56 bears to the leg 16 of the opening determines the angle of the bend to be made. Bends of various degrees may be made,it being understood that difiere'nt core and die members must be employed for eachpar- Each of the die members maybe providedwith a semi-circular recess which, when the member 9 whichsurrounds the sired.

members are in place, will form a cylindrical socket 17 for the reception of a guide 18 having a bore equal in diameter to the outside of the tube to be bent.

The'operation is as follows: The die members 5' and 6 are 'gether with their recessed faces in conjunction. The core member 1 is placed in posi-v tion in the leg 16 of the die opening with the plate 3 resting against the ends of both die members. The plate 3 and the shoulder 4 will so position the member 1 that no portion of its surface will touch the wall of the "/0 brought to' die opening; The guide tube 18 is positioned inthe socket 17 and the die, as a whole, is placedon the table 19 of a punch press, for example. The die is held in position on the table by any suitable means, such as the vise members shown.

A plate 8 carrying a tubular punch member '9 of the same size as the tube to be bent, is secured to the lower face of the press head 8 of the machine. A.- core member 2 of the same diameter as the member 1 is placed within the punch 9 with its upper end resting against. the spring 11, and the screw 13 is inserted in the slot 12, to prevent rotation of the member 2. w

. A short section 20 of the tube to be bent is placed with the die, with its lower end resting between the extremity of the member 1 and wall of the die opening. The end of the section 20 is preferably beveled, as shown, but it may be cut off square if de- The die is positioned with the leg 15 of the die opening in axial alinement with the 'member'2. Power is applied to the head '8.

The member 2 is moved downward into the section 20'until the lower end of the member 2 engages the member 1. The continued movement of the head will compress the spring, and the punch 9 will engage the unoerend of the section 20 and force it around the blend in the die opening. The

beveled end elf the section will cause the first part ofthe bending operation to take place on the outside of the. elbow, and the section willbe forcled to the position shown in" he head will be raised withdrawing the gunch 9 and the member- 2 from the die. he latter will be, removed from the table and the parts thereof separated, releasing the member 1 with the bent section there- 'on. The bent section may then be removed from the member in any desired manner, the bevel end cut oil,- and the operation above described repeated. Y

With a device of the character hereinbefor described, I. bend tubesv rapidly, without any wrinkles on any surfaces and without the employment of any skilled labor.

In accordance with the provisions of the Y patent statute, I have described the princi- .nevoma ple of my invention together with the apparatus which I now consider to represent the best embodiment thereof, but I desire it understood that my invention is not confined to the particular form of apparatus herein shown and described. the same being merely illustrative, and that the invention can be carried out in other ways without departing from the spirit of my invention, and, therefore, 1 claim broadly the right to employ all equivalent instrumentalities coming within the scope of the appended claims, and by means of which objects of my invention are attained, and the new results accomplished, as herein set forth, as it is obvious that the particular embodiment herein shown and described is only one of many that can be employed to attain these objects and accomplish these results.

Having now described my invention, what I claim and desire to secure by Letters Patent is 1. The method of bending tubes, which comprises forcing the tube over a core composed of two rigid stationary core members arranged at an angle to each other, and removing the members from opposite ends of the bent tube.

2. The method of bending tubes, which comprises forcing the tube over a core composed of two rigid stationary core members arranged at an angle to each other, and removing the members from opposite ends of the bent tube, each in a straight line.

3. The method of bending tubes, which comprises forcing the tube over a core composed of two straight rigid stationary core members arranged at an angle to each other, and removing the members from opposite ends of the bent tube.

4. The method of bending tubes, which comprises forcing the tube over a core composed of two straight rigid stationary-core members arranged at-an angle to each other, and removing the members from opposite ends of the bent tube, each in a straight line.

5. The process of bending tubes, which comprises forcing the tube over a core comprising a plurality of rigid core members arranged at an angle to each other, said core members defining the bend of the tube and filling the interior thereof, withdrawing one member from the elbow thus formed in the direction of the axis of one leg of the elbow, and withdrawing the other member from the elbow in the direction of the other axisv of the elbow.

6. An apparatus of the class described, comprising a die having-an opening therein, said opening being of the shape of the bend desired, a separable rigid core member extending through the opening from end to end thereof, and means for forcing a tube into the opening, around the bend and changing its direction of travel by contact with the member.

7. An apparatus of the class described, comprising a die having an opening therein, said opening being of the shape of the bend desired, a rigid core comprising a plurality of core members extending into the opening and means for forcing a tube into the opening and changing its direction of travel by contact with the members.

8. An apparatus of the class described, comprising a die having an opening therein, said opening being of the shape of the bend desired, a rigid core member extending into the opening from one end thereof, a second core member extending into the opening from the other end thereof, said members being arranged at an angle to each other, means for forcing a tube into the opening between the wall thereof and the core members whereby the tube will be bent to conform to the angularity of the core members, and means for withdrawing the core members from the tube.

9. An apparatus of the class described,

comprising a die having an opening therein, said opening being of the shape of the bend desired,'a rigid core member extending into the openin from one end thereof, a second core mem er extending into the opening from the other end thereof, said members being arranged at anangle to each other, means for forcing a tube into the opening between the wall thereof and the core members whereby the tube will be bent to conform to the an larity of the core members, and means or withdrawing the core members in opposite directions from the tube.

10. An apparatus of the. class described, comprising a die having an opening therein, said opening being of the shape of the bend desired, a rigid core member extending into the opening from one end thereof, a second core member extending into the opening from the other end thereof, said members being arranged at an angle to each other, a tubular element surrounding one of the core members for forcing a tube into the opening between the wall thereof and the core members whereby the tube will be bent to conform to the angularity of the.

core members, and means for withdrawing the core members from the tube.

11. An apparatus of the class described, comprising a die having an opening therein, said opening being of the shape of the bend desired, a rigid core member. extending intothe opening from one end thereof, a second core member extending into the opening from the other end thereof, said members bein arranged at an angle to each other, a tu ular element surrounding one of the from end to end thereof. and.

core members being so proportioned and ar-v core members for forcing a tube into the opening between the wall thereof and the 4 core members whereby the tube will be bent to conform to the an ularity of the core members, and means or withdrawing the core members in opposite directions from the tube.

12. An apparatus of the class described, comprising a die havin an opening therein, said opening being of t e shape of the bend desired, a rigid core member extending into the opening from one end thereof, a second rigid core member'extending into the openranged that each may be removed from the tube by movement in a straight line.

13. An apparatus of the class described, comprising a die having an opening therein,

said opening being of the shape of the bend desired, a rigid core member extending into the opening from one end thereof, a second rigid core member extending into the opening from the other end thereof, said members being arranged at an angle to each other, the end of one member being formed at an angle to correspond with the angularity of the other member, said end being formed tofit the periphery of the said other member, means for forcing a tube into the opening between the wall thereof and the core "members whereby the tube will be bent to conform to the angularity of the core members, means whereby the tubular element may be removed from the die, the said core members being so proportioned and arran ed that each may be removed from the tu e by movement in a straight line.

This specification signed and witnessed this 18th day of April, 1919.

ANTHONY VASSELLT Witnesses:

JOHN L. LOTSCI-I, M. JONES.

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