US1868083A - Stay bolt - Google Patents

Description

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y "r. s. WHEELWRIGHT STAY BOLT F'ile d Nov. 15. 1930 v l I I I I I Illllllllllll IIl-Illlllllllllllll Patented :July 19, 1932 unITansTA-TEs PATENT mm:-

' THOIASB. WHEEIQWBIGHT, OF RICHMOND, VIRGINIA, ASSIGNOB TO OLD DOMINION men a mm. woaxs,

OI BELLE ISLE, RICHMOND, VIRGINIA, A GORPQBATION OI" BTAY BOLT Indication fled November 15, 1930. Serial No. 495,994.

This invention "relates to flexible hollow I staybolts for locomotive and other boilers which are subjected to excessive vibration, and particularly to that type of flexible staybolt which is provided with a rounded head,

at one end, for flexible connection with the outer shell of the boiler and a tell-tale hole extending thro'u bout the entire length.

staybolts of t e present type are usually manufactured from stock which has been severely tested to make sure that it conforms to very exacting specifications. However,

as it has been customary to form the headof the bolt by a methodre uirin excessive heating of the stock, and orm t e tell-tale hole by drilling said stock, longitudinally, the nature of themetal is necessarily changed and injured to. such an extent that the value of the inspection under specifications is wholly lost.

In view of the foregoing, itis an object of the present invention to produce a flem'ble tell-tale staybolt, of the headed type, wherein the stock has been provided with the telltale hole prior to the time of testing the same, and a further object to produce a bolt where,-

in the heading of thesame isaccomplished without subjecting the original stock to the heat required for forging the head.

In order to accomplish the first object mentioned, it is advisable to form the bolt of -hollow rolled staybolt stock such as is set forth in United States Patents No. 1,618,142

' the tell-tale hole is then protected from corbeing threaded thereon or by and Nb. 1,668,705. Another reason for using hollow rolled'stock is that the wall of rosion by. the skin of the metal as well as by the silica flour which is burned into the said wall during the process of manufacture.

' To accomplish the second object of the in vention, the head is attachedfo the-bolt by formed integral'therewith by swaging or ot er process not requiring the application of heat, as 7 more fully described later herein. i

A further object of the invention isto.

provide a staybolt of the typementioned wherein the tell-talehole will extend entirely through the cap usually provided at the outer ends of such bolts, so that it possible taken in connection with to inspect the same by inserting a testing instrument into the tell-tale hole without removing the said cap.

Other objects and advantages will be ap-' parent from the following description when the accompanying drawing. r

In the drawingi I Figure 1 is asectional view showing one form of the invention.

Figure 2 is a sectional view showing another form of the invention.

Figure 3 is a fragmentary sectional view showin the device used for screwin ,the form 0 bolt, of Figure 2, into the inner oiler sheet.

Figure 4 is a detail sectional view showing the bolt seated directly in a seat in the boiler sheet, the sleeve not being used.

1 Referring particularly to the accompanying drawing, and especlally to Figure 1, 10 represents a portion of the outer sheet of a steam boiler, while 11 represents a portion of the inner sheet thereof. In the outer sheet '10 there is formed an opening 12, having a smooth wall, while in the inner sheet 11, in direct alinement with the opening 12, is a threaded opening 13. Disposed within the opening 12, of the outer sheet, is a' sleeve 14,

said sleeve being welded to the outer face of the boiler sheet, as shown at 15. This sleeve projects inwardly, beyond the sheet, and also bolt, and its outer face, which is flat, is provided with wrench receiving notches 19, whereby to permit screwing the bolt into the opening- 13. This manner of attachin the head to the bolt obviates the necessity of eating the latter, resulting in danger to the tends slightly beyond the flat face of the head 18, and such projecting end is rounded, as

shown at 23, to bQ'I'GCGlVGd in a socket 2 1, formed in the inner end of a stem 25. The.

socket end of the stem is slightly larger, in diameter, than the major portion thereof, whereby to provide a shoulder 25'. Theouter end\of this stem projects through the opening 21, o f the cap 20.

Engaged on the stem 25 is a concavo;convex bearing washer or disk 26, preferably formed from brass, which bears against the umer concave surface of the cap 20, and disposed within the concavity of said disk is a packing disk 27 preferably formed of lead, or other suitable soft metal, which is compressible,

- and which can be forced into the joint between the disk 26 and the stem 25, whereby to render said joint steam-tight. Also disposed on the stem 25, and disposed against the pack ing disk 27, is a hard metal washer or bearing plate 28. Encircling the stem 25, and bearlng respectively against the shoulder 25' and the plate 28, is a strong coil spring 29, which, when the arts are properly assembled, urges the dlsk 26 tightly against the inner face 'of the cap.

Formed longitudinally throughout the entire length of the bolt is a telltale hole repre sented by the numeral 30, Wh10l1 is formed in the stock, from which the staybolt is made, and which is described in my prior patents, 1,618,142 and 1,668,705, as already stated herein. This obviates the necessity of boring the telltale hole after the stock has been tested, for reasons already set forth,

Formed longitudinally and centrall through the stem 25 is an opening 16', whic forms a continuation ofthe telltale hole 30,

of the staybolt, the inner end of said opening 16 registering with the adjacent end of said telltale hole, as clearly seen in Figure 1 In the form of the device shown in Figure 2, the head 31, of the staybolt 32, is formed integrally therewith. This may be done by swaging the metal into a suitable form,.with the use'of a swaging tool which will, at the same time, produce the conical socket 33. In this form, also, the stem 34 is provided. with a rounded head 35, at its inner end, which rests in said conical socket 33. To provide for screwing this bolt into the threaded opening of the inner sheet of the boiler, a threaded recess 36 is formed at the bottom of the socket 33, to receive the threaded stem 37 of a conical may be used without the sleeve, by positioning the head of the bolt directly on a seat 40, formed in the opening 41, on the boiler sheet, as shown in Figure 4. When this arrangement is used, the cap 20 may be welded directly to the boiler sheet.

What is claimedis:

1. In a staybolt structure, a casing comprising a sleeve and cap havin outerand inner spherical seat surfaces, an said cap having an opening in its outer wall concentric with its seat surface, a bolt having an end portion disposed in said casing and provided with an inner head member having a spherical seat surface pivotally engaging the seat surface of the "sleeve, an axial extension projecting beyondsaid. inner head member and projecting outwardly through the opening in the cap, the bolt and its extension being provided with a tell-tale hole extending. continuously from. end to end thereof, an outer head member slidable on the bolt extension toward and from the inner head member and having a spherical seat surface pivotally en gaging the seat surface of the cap, and resilient means acting to force the outer head, member outward and away from the inner head member and against said seat surface of the cap.

2. In a staybolt structure, acasing comprising a sleeve and cap having outer and inner spherical seat surfaces, and said cap havin an opening in its outer wall concentric wit its seat surface, a bolt having an end portion disposed in said casing and provided with an inner head member. having a spherical seat surface pivotally engaging the seat surface of the sleeve, an axial extension projecting beyond said inner head member and projecting outwardly through the opening in the cap,

a tell-tale hole extending continuously from end to end thereof, an outer head member slidable onthe bolt extension toward and from the inner head member and having a spherical seat surface pivotally engaging the seat sur face of the cap, a packing member for closing the joint between the bolt extension and outer head member, and a spring for pressmg the packing againstthe outer head member and acting to force the outer head member outward and away from the inner head member and against said seat surface of the cap.

3. A staybolt construction for use in connection with a boiler sheet having a seat and a centrally apertured cap secured in position 1.05: I the bolt and its extension being provided with over said seat,vcomprising a bolt having 11. head seated on said seat and provided with a stem extending beyond said head into said cap and through the aperture thereof, a centrally apertured spring pressed bearing disk on the stem having a face snugly and slidably contacting with a face of said cap, a

packing against said disk, andmeans fo r pressing said packing into the aperture of said disk and against said stem.

4. A staybolt construction for use in connection With a boiler sheet having a seat and a centrally apertured cap secured in position over said seat, comprising a bolt having a head seated on said seat and provided with a stem extending beyond said head into said cap and through the aperture thereof, a centrally apertured spring pressed bearing disk on the stem having a face snugly and slidably contacting wlth a face of said cap, a packing against said disk, and means for pressing said packing into the aperture of said disk and against said stem, said stem being movably engaged with said head.

In testimony whereof, I aflix my signature.

THOMAS S. WHEELWRIGHT.

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