US1291782A - Stay-bolt for boilers. - Google Patents

Description

E. ILDODDS, B, E. D. STAFFORD & C. HYLAND.

STAY BOLT FOR BOILERS.

APPucAHoN FILED MAR-7,1917.

1,291,782. Pdtented Jan. 21,1919.

WITNESSES l VEN T0185 M 'Nrr ETHAN I. Dorms, BENJAMIN E. n. s'rarronn, AND CHARLES I-IYLAND, or rrr'rsnunen,

PENNSYLVANIA, ASSIGNORS TO FLANNERY BOLT COMPANY,

PENNSYLVANIA.

OF PITTSBURGH,

STAY-BOLT FOR BOILERS.

Specification of Letters Patent.

Patented Jan. 21, 1919.

Application filed March 7, 1917. Serial No. 153,132.

To all whom it may concern:

Be it known that we, ETHAN I. Dorms, BENJAMIN E. D. STAFFORD, and CHARLES HYLAND, citizens of the United States, and residents of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improve.

ments in Stay-Bolts for Boilers; and we do hereby declare the following to be a full, clear, and exact description 0 the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improvement in stay bolts for boilers, and more particularly to such as are known in the art as flexible staybolts and provided with tell-tale holes,--one object of the invention being to provide simple and efiicient means whereby a tubular bolt body may be provided with a head at its outer end without necessity for upsetting the metal of the body portion to form a head, which upsetting would close or contract the tell-tale bore for a prohibitive distance inwardly from the head at the outer end of the bolt.

\Vith this and other objects in view the invention consists in certain novel features of construction and combinations of parts as hereinafter set forth and pointed out in the claims.

The accompanying drawing is a longitudinal sectional view illustrating an embodiment of our invention.

In the construction of flexible staybolts for boilers, it has been proposed to provide the bolt with a telltale hole into which steam and water may enter in the event the bolt becomes ruptured and from which steam and water may escape -to denote'the defective condition of the bolt. These tell-tale holes have been made to extend from the headed end of the bolt for a limited distance inwardly from the head, but it is desirable to cause such tell-tale hole to extend from the headed end of the bolt continuously to the inner end thereof and to be capable of discharging at said inner end of the bolt. Attempts have been made to con struct the staybolt from a tubular bar, and in some instances this tubular bar has been formed of two members welded together. In upsetting such a bar to force the peripheral face,

head thereon, liable to be closed for a prohibitive distance inwardly from the head.

To obviate these objections and still employ a tubular bar having a continuous bore, in the manufacture of the bolt, we provide the body 1 with a partly spherical head 2 in the form of an annulus havinga convex and the headed end of the bolt may be slotted or recessed as at 10 to receive a suitable tool. The bore of the annular head 2 is formed with an enlarged portion 3 which extends inwardly from the outer end of the head and forms an annular shoulder 4. The outer end portion of the bolt body is provided with an annular enlargement 5 which may be formed by machining the end portion of the bolt body and which occupies the enlarged bore 3 in the head and forms a shoulder 6 against which the shoulder 4; in the head abuts.

In assembling the parts of the bolt, the annular head 2 will be first applied to the inner end of the bolt body and then moved outwardly over said body. The annular head will then the shrunk onto the bolt body with the use of a suitable tool.

The inner end portion of the bolt may be threaded, as at 7 to screw through the inner boiler sheet, and the continuous bore 8 which forms the tell-tale hole for the bolt, is permanently closed within the headed outer end of the bolt by means of a suitable metal plug 9. Thus it will be seen that the tell-tale hole extends from a point within the head at the outer end of the bolt, continuously to the inner end of the bolt.

Having fully described our invention what we claim as new and desire to secure by Letters-Patent, is

1. A staybolt comprising a body portion having a shoulder near one end, and an an nular head fixed on said body and having the bore or tell-tale hole is an internal shoulder intermediate the ends nular enlargement disposed in the larger portion of the bore of the annular head and having a tool slot in one end; and an annnelar head having a convex outer face, rigidly secured to said bolt body at the slotted end thereof.

In testimony whereof, We have signed this 15 specification in the presence ofitwo SllbSCI'lb? mg Witnesses.

ETHAN I. DODDS. BENJAMIN E. D. STAFFORD. CHARLES HYLAND.

Witnesses EDWIN- S, ,R-YCE, HAROLD SCHUNEMAN.

fiopiea o2 this p atent may be obtained for five cents each, byaddressing the Commissioner of Patents,

. Waehingtomm. 0."

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