US1119655A - Flexible stay-bolt. - Google Patents

Description

B. E. D. STAFFORD.

FLEXIBLE STAY BOLT.

APPLICATION FILED APR. 1, 1914.

1, 1 19,655. Patente-d Dec. 1,1914.

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BENJAMIN E. D. STAFFORD, OF PITTSBURGH, PENNSYLVANIA, ASSIGN'OR TO FLANNEBY BOLT COMPANY, OF PITTSBURGH,PENNSYLVANIA.

FLEXIBLE STAY-BOLT.

Application led April 1,

To @Zlio/01net may concern.'

Be it known that I, BENJAMIN E. I). STAFFORD, of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful` Improvements in Flexible Stay-Bolts; and I do hereby declare thev 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.

ll/Iy invention relates to an improvement in flexible stay bolts.

rIhe inspection of stay bolts within fixed periods is mandatory, and to inspect and test them the heads of the bolts must be eX- posed for tapping and turning.

`Witli stay bolts now in use, the head of the bolt is mounted in a sleeve and is covered by a cap screwed to the sleeve. 'The pressure of the head of the bolt against the inside of the sleeve tends to bulgevor eX- pand the latter thus causing the clap to stick. Again the formation of rusten the threads connecting the capl and sleeve retards the removal of the cap, hence it is usually necessary to loosen the cap by tapping it with a hammer which frequently results in fracture or other injury to the cap o r sleeve. Again when the cap is stuck fast, the efforts to unscrew it, result at times in loosening up the connection between the sleeve and the outersheet of the boiler.

The object of the present invention is to provide for the quick and ready inspection of the stay bolt proper without Vdanger of injury to the parts in which the head of the bolt is mounted, and it consists in the parts and combinations of parts as will be more fully explained and pointed out in the claims.

In the accompanying drawings, Figure l is a view partly in side elevation and partly in section of my improvement. Fig. 2 is an outer end view of the same. Fig. 3 is a view in section at right angles to the section shown in Fig. l. Fig. 4 is a view in section of the cap, and Fig. 5 is a view in section of the head of the bolt.

1 represents the bolt, the head 2 of which is substantially fiat on top, with its periphery or rim in the are of a circle, the curved edge of the head joining the body of the shank of the bolt by reverse curves, as shown in Figs. 1 and 5. The head rests on Specification of Letters Patent.

Patented Dec.. 1, 1914.

Serial No. 828,868.

attachment to a sheet ofthe boiler, the bore y at the inner end of the sleeve being of greater diameter than the body of the bolt, and made flaring so as to permit of a free lateral or rocking movement of the bolt within reasonablel limits. rIhis sleeve receives and houses the head 2 of the bolt and is provided internally as previously e2;-V

plained with the seat 3 formed in the arc of a circle concentric with the curvature of the rim of the head, against which said head rests, and which `permits of a universal movement o-f the head on its seat during the movements caused by the expansion and contraction of the sheets to which the bolt is connected. The bore or cavity of the sleeve at the outer side ofthe seat 3, is of a size sufficient for the free entrance of the head of the bolt, and the sleeve is preferably provided externally at its outer end with an angular rim as shown in Fig. 2 for engagement with the wrench used in attaching the sleeve to the boiler sheet.

The sleeve 4 is provided adjacent its outer end with an annular shoulder 6 on which the cap 7 rests; the shoulder V6 beingsutiiciently within the sleeve so that when cap 7 is on its seat, it will not project beyond the outer end of the sleeve. This cap forms a steam tight closure for the outer end of the sleeve and is held in place by the plug 8 screwed into the ring 9. rIhis ring is provided with two oppositely disposed ears 10 and 1l, the ear l0 of which is perforated for the passage of a screw bolt l2 which passes through the ear 10 and into ear 13 and forms the pvot on which the ring turns, while the ear 1l is provided with an open slot for the reception of the screw bolt 14. 'Ihe ring is therefore pivoted to the bolt l2 and is free to swing laterally thereon, while the bolt 14 serves to hold the ring in position over the end of the sleeve, and assists in supporting the ring against the outward thrust of the plug. The ring is further supported in its assembled position by the overhanging lip 15 engaging the projecting flange 16 on the ring.

When the parts are assembled, the plug 8, which is threaded externally, is turned by a suitable tool inserted in the angular recess in the outer i'ace, in a direction to engage and bear against the cap thus forcing the latter solidly against its seat and tending to torce the ring outwardly against the heads oi the bolts, thus not only locking the cap in place but also locking the ring against the possibility of any turning movement on its pivot bolt l2. lli/dien it is desired to inspect the bolt head, the plug 8 is withdrawn sutlicient to relieve all pressure against the cap, and it necessary the bolts 12 and le er either of them, may be unscrewed sufficiently to tree the ring. rthis relieves all friction between tbe ring and its screw bolts l2 and lll and leaves the ring tree to be turned, and atter lthe latter has been turned to one side and out ot the plane of the long axis of the bolt, the cap 7 which is then unconiined is tree to be removed. After the inspection the cap is replaced, the ring turned to its normal position and the parts again locked by screwing in the plug and screwing up on 'the bolts l2 and 14.

It is evident that changes in the construction and relative arrangement of the seiferal parts might be made without avoiding my invention and hence l vwould have it understood that l do not restrict myself to the particular construction and arrangement of parts shown and described, except as required by the scope of the claims.

Having fully described my invention what I claim as new and desire to secure by Lettersdatent, is:

l. In iiexible stay bolt construction, the combination of a sleeve, a cap seated within the sleeve and closing the outer end ot the latter, a. ring pivoted to the sleeve at one side ot the latter, the axis of said pivot being parallel with the long axis ot' the sleeve, meansy on the opposite side of the sleeve for engaging the ring when the latter is in its normal position, and a screw plug carried by the ring and adapted to engage the cap.

2. In flexible stay bolt construction, the combination of a sleeve, a cap seated within the sleeve, a ring mounted on the outer end of the. sleeve and provided adjacent its outer edge with a hole and at a diametrically opposite point with an open slot, a bolt passing through the hole in the ring and secured to the sleeve, a bolt secured to the sleeve and adapted to rest in the slot in the ring when the latter is in its normal position, and a screw plug carried by said ring and adapted to be forced inwardly into contact with the cap. f

A stay bolt the head ot which is rounded and provided with a drive slot termed in the arc of a circle, the said slot being wholly to one side of the transverse center ot the head, substantially as and for the purpose described.

i. ln flexible stay bolt construction, the combination ot' a sleeve, a ring pivoted te 'the sleeve, the axis of the pivot being in the direction ot the long axis of the sleeve and a screw plug carried by the ring and adapted to normally rest in line with the outer end oi the sleeve.

5. in -Flexible stay bolt construction., the combination ot a sleeve, a ring pivoted to the sleeve, the axis of the pivot being at one side of `the long` axis of the latter', means at the opposite side ot the sleeve tor engaging the ring when the latter is in its normal position, and a screw plug carried by the ring and movable toward and away from the outer end of the sleeve.

in testimony whereof, l have signed this specification in the presence ot1 two subscribing Witnesses.

BENJAh/HN lf). D. STAFFORD.

Witnesses:

EDWIN S. RYCE, HOWARD O. CArrnL.

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

Washington, D. C.

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