US1102993A - Tube-expander. - Google Patents

Description

TUBE BXPANDBR.

'15102,9-93, 3' ma Patented Jul)Y 7, 1914.

` HEET 2.

0TTO WIEDEKE rrp s'rATES PATENT FFICE' OTTO WIEDEKE, OF DAYTON, OHIO, ASSIGNOR OF ONE-HALF TO GUSTAV WIEDEKE, OF DAYTON, OHIO.

TUBE-EXPANDER.

Application filed November 13, 1913.

To all whom t may concern Be it known that I, OTTO WIEDEKE, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in TubeExpanders; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification. n

This invention relates to new and useful improvements in tube expanders or implements for expanding the ends of tubes in the tube sheets of boilers. n

The invention is especially adapted for expanding arch tubes of locomotive boilers which, owing to the presence of the water legs, requires an expander of comparatively greater length in order to reach the end of the arch tube from the outside of the'boiler.

The objects of the invention are several, principally among which are to provide means in this type of tube expander for preventing the expanding rollers from dropping inwardly and becoming displaced from the tool when the mandrel is withdrawn; and to provide convenient means for enabling the operator to determine the extent of insertion of the mandrel as the tool is being operated to expand the tube.

Preceding a detail description of the invention, reference is made to the accompanying drawings, of which- Figure 1 is a longitudinal side elevation of a tube expander constructed in accordance with my invention; Fig. 2 is a longitudinal section of the same on the line e-e of Fig. l; Fig. 3 is a section on the line a-a of Fig. 2; Fig. 4 is a section on the line -b of Fig. 2; Fig. 5 is a section on the line o o of Fig. 2; Fig. 6 is a view of the mandrel; Fig. 7 is a section on the line cZ-cl of Fig. 2; Fig. 8 is an enlarged sectional view of the head of the tool showing the manner of inserting the rollers; and Fig. 9 is a detail view of the ring which is instrumental in holding the rollers in position.

In a detailed description of the invention, similar reference characters indicate corresponding parts throughout the speoica tion and drawings.

Specication of Letters Patent.

Patented July 7, 1914.

Serial No. 800,872.

The body of the tool is lengthened as compared with the ordinary tube expander because of its being designed to extend through the water leg of a boiler to expand arch tubes as before stated. The said body consists of a shank or barrel l terminating at its forward end in a head 2 provided with the usual openings 3 for the expanding rollers t to project through in making contact with the surrounding surfaces of the boiler tube. The said 'barrel is further provided with a double row of openings 5 which will be again referred to in connection with a guard G. The mandrel 7 is insertible throughout the length of the barrel in the usual manner and is made tapered to form a wedgcflike engagement with the inner sides of the rvexpanding rollers. Referring to the openings 34 through which the rollers project, the outer longitudinal edges 8 of said openings are curved inwardly in the usual manner to,` prevent the rollers from falling put of the head. The means for preventing said rollers falling inwardly when the mandrel is withdrawn is as follows: In order to facilitate andV make possible the placing of the expanding rollers in position and maintaining them in such position against any tendency to fall inwardly within the head when the mandrel is withdrawn, the inner ends of the slots or openings 3 are provided with outward and rearwardly tapered surfaces 10 which extend from straight surfaces 11. The tapered surfaces 10 permit the rollers to be inserted in the interior of the head 2 andk to be subsequently raised to a parallel position which is the operative position of the rollers as is shown in Figs. l and 2. In Fig. 8, the dotted lines show the manner of inserting said rollers. l/Vhen in the operative position, the straight surfaces l1 form shoulders whichmaintain the rollers against any lengthwise shifting while in operation. Extending from the inner longitudinal margins of the roller openings are inwardly projecting shoulders 9 which extend from the inner terminals of the tapered surfaces 10 a sufficient distancev to support the rearward ends of the rollers from falling inwardly when the mandrel is withdrawn. In inserting the rollers in the manner yshown in dotted lines in Fig. 8, the rearward end of each roller is moved in position above the shoulders 9, such movement being permitted by the tapered surfaces 10. The ends of the rollers 4t opposite the shoulders 9 are provided with pins or projections 19 which, when the rollers are in operative position, lie in pockets 12 at the ends of the openings 3. The inner ends of the pockets 12 are adapted to be closed by a resilient ring 17 j which lies in a suitableannular recess 18 on the interior of the'head 2. The said ring 17 lies in the path of the pins 19 thereby maintaining, in connection with the shoulders 9, the rollers 4]: in the pockets 3 `when the mandrel 7 is withdrawn. The length of the pockets 12 is vsuch that the rollers Amay have a radial movement during the process of ex* panding the tube. rlhe resilient ring 17 is sprung into the recess 18 through the central opening in the head of the tool.

The guard or ring 6, before referred to, is inclosed by the usual bearing or collar 13. Heretofore, so far as ll am aware, it has been the practice to unite the said guard to the body of the tool by means of set screws which engage the outer circumference of the barrel and are provided with heads which proj ect beyond the circumference of the guard. Such means are often found objectionable in manipulating the implement because of the fact thatl the heads of the screws frequently come in contact with parts of the boiler head when rotating the implement in the operation of expanding the tubes. /Vith the present improvement, the set screws 1A are reduced in diameter at their inner ends, as at 15, to enable said screws to enter the openings 5 in the barrel and to be inserted below the circumference of the guard 6. A number of such openings 5 are provided in the barrel to enable the collar to be shifted to the desired position and there united to the barrel. To permit of a finer adjustment of the guard 6 without decreasing the strength of the screw at 15 or the barrel 1, the said openings are staggered in a double row as is shown in Fig. 1. In this connection the present device is an improvement over the device shown and described in my co` pending application, Serial No. 791,505, filed Sept. 211, 1913. Y

1n manipulating the implement, it will be understood that the mandrel 7 is forced into the barrel as the work of expanding progresses in order to exert a progressive outward force on the expanding rollers. Heretofore, so far as I am aware, the operator had no guide to direct him in this matter in order that he might know the extent of the insertion of the mandrel. In order to overcome this objection, I have provided on the outer end of the mandrel a series of circular lines 16 of equi distance. These lines form an index by which the operator may know the extent of the insertion of the mandrel necessary to accomplish the expansion of the tube.

Having described my invention, I claim.

1. A tube expander, comprising an elongated cylindrical body terminating at vone end in a head provided with the necessary roller apertures, the rearward end walls of said apertures being tapered outwardly and having inwardly lying shoulders extending therefrom, a series of expanding rollers confined within said apertures, the rearward ends of which lie between said shoulders and the outer longitudinal edges of the apertures, a pin extending from one end of each of said rollers, and means in the head in a position to be engaged by said pins and supportingV the outer ends of said rollers.

2. A tube expander, comprising a cylinwalls of said openings being taperedV and the rearward sides having shoulders extending inwardly therefrom, a series of expanding rollers within the openings in said. head, an axial pin extending from one end of each of said rollers, said head being provided with pockets at the ends of said openings to receive said pins, and means in said head inaposition to be engaged by said pins and supporting the outer ends of said rollers.

3. A tube expander, comprising a'cylin-v drical body. terminating at one end in a head provided with roller openings, the rearward walls of said openings being tapered andthe rearward sides of said openings having shoulders extending inwardly therefrom, a series of expanding rollers mounted therein, an axial pin extending from one end of each or' said rollers, said head being provided with pockets at the ends of said openings to receive said pins, and a resilient ring mounted in said head in a position to be engaged by said pins and adapted to support the outer ends of said rollers.

ln testimony whereof I afl'ix my signature, in presence of two witnesses.

OTTO VVIEDEKE. l/Vitnesses:

BERTHA VIEDEKE, MATTHEW `SIEBLER.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C.

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