US35691A - Improved method of securing tubes in tube-sheets - Google Patents

Description

UNITED STATES PATENT OFFICE.

JOHN H. KNICKERBOCKER, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVED METHOD OF SECURING TUBES IN TUBE-SHEETS.

Specification forming part of Letters Patent No. 35,691, dated June 524, 1862.

panying drawings, making a part of this specification, in which- Figure 1 is a longitudinal central section of a portion of a boilcniue having. one end secured in the tuhesheet, according to my invention. au, Fig. 2, indicate the plane of section. Fig. 2 is an end View of the same; Fig. 3 a longitudinal central section of a line and ferrule, the latter not being driven in the former; Fig. 4, the same View as Fig-3 with the ferrule driven in the flue.

Similar letters of reference indicate corresponding parts in the several figures.

This invention consists in the employment or use of a ferrule having a concave outer surface of slightly taper form, and of such diameter that it may be driven into the flue and expand the end of the same in such a manner that it will close snugly around the hole made in the tube-sheet to receive the flue and form a tight and permanent connection of the flue to the tube-sheet, as hereinafter fully shown and described.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A represents a portion of a tube-shcet of a steam-boiler, and a is a circular hole in the sheet which receives the end of the flue B. The edge of the hole a is made convex, as shown in Figs. 1, 3, and 4, and it is rather larger in diameter than the flue B, to admit of the latter being expanded with it.

C is a fer-rule, the exterior of which is slightly taper from its outer edge to the point a', and is grooved circumferentially, as shown at b, between said points, so as to form a concave surface. The inner part, c, of the ferrule is beveled or tapered quickly from the edge of the groove b to the end of the ferrule. The external diameter of the ferrule at the inner edge of the groove b, at the point a', is equal in diameter to the interior of the flue B, as shown clearly in Fig. 3.

The operation of securing the Ilue in the tube-sheet is as follows: The end of the tine B is inserted in the hole a in the tube-sheet and so adjusted as to extend a trille beyond it. The ferrule G is then inserted in the end of the tlue B, a mandrel, D, placed against its outer edge, as shown in red in Fig. 3, and the ferrule driven in the flue, so that the ends ot' the flue and ferrule will be ilush with each other, as shown in Fig. 4. The ferrule C, in being driven into the flue, slightly expands its end, and a taper mandrel, E, is then inserted in the ferrulc and driven through it, so as to expand the ferrule and also the end ofthe flue until the exterior of the latter is closed tightly all around the edge of the hole a in the tubesheet A and at both sides of it, as shown in Fig. 1. This expanding of the ferrule also causes its interior to be equal in diameter to the interior of the tlue B, as shown in Fig. 1, and colisequently a iu'e of equal diameter internally is obtained throughout, and also a smooth unbroken surface with a tight and permanent connection of the flue and tube-sheet is ob tained.

Taper ferrules have been used with plane exterior surfaces for expanding the iues and securing them in the tube-sheets; but they have served to contract the orifices of the fines, and are therefore objectionable on that account.

I do not claim, therefore, broadly or irre spective of construction a ferrule for securing the ues of boilers in tubesheets; but

What I claim as new, and desire to secure by Letters Patent, is

Securing the iues B of boilers in the tubesheets A thereof by means of the'ferrules C, grooved at their exterior, tapered, and driven in the ends of the tlues, so as to cause the ends of the saine to close around both edges of the holes a in the tube-sheets and admit of the line being of equal diameter throughout, as herein set forth.

JOHN H. KNICKERBOOKER.

Witnesses:

XV. H. TAsKEE, JNO. D. BLAND.

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