US984862A - Steam-boiler and stay-bolt for same. - Google Patents

Description

B. E. D. STAFFORD. STEAM BOILER AND STAY BOLT FOB- SAME.

APPLICATION FILED 00w. 1, 1909.

984,862. PatensadFeb. 21, 1911.

2 BKEETS-SHBBT 1.

TNESSES 1' w! INVENTOR A lt orney B. E. D. STAFFORD. STEAM BOILER AND STAY BOLT FOR SAME.

APPLICATION FILED OUT. 1, 1909.

I 3136111366. Feb. 21, 1911.

2 SHEETS-SEEET 2.

I gjQ/VE/VTOR v and it consists in providing the roof sheet of the boiler- 'wlth raised seats or bosses, the

.sheets connected by my ftlexible stay bolts.

- bolt uountecl in a sleeve secured toa raised outer face of the seat will be approximately nurrnn STA l ES ra rnn r enrich.

BENJAMIN D. STAFFQR D, OF PITTSBURG, PENNSYLVANIA. ASSIGNOR T0 PLANNER? BOLT COMPANY, OF PITTSBUEi-G, PENNSYLVANIA.

STEAM-BOILER AND STAY-BELT FOR SAME.

Application filed Octobeni,

Specification of letters Patent. Patented! Felt). 21

1969. Serial No. 520,543.

To all whom it may concern:

-Be it known that I, BENJAMIN E. D. STAQ- ronn,.of Pitts-burg, in the county of i\llti-: gheny and State of Pennsylvania, have in". vented certain new and useful Improvements in Steaui-llngineBoilers and Stay-Bolts for Same and I do hereby declare the following to be a full, clear. and some description of the invention,-. such as will enable others skilled in the art to whichitappertaius to make and use. the same. v My invent-ion relates to an improvement in steam ienginef'hoilcr and stay bolts t'or same.

outer facesfot which are substantiallygat right angles to the long axes of the stay bolts, thereby enabling the seats to be more perfectly prepared to'receive the sleeves of the stay bolts. and obtaining continuous threads which insure steam tight connection between the parts.

In the accompanyingdrawings, Figure 1 is a viewin section of a portion of a locomotive boiler showing the roof and crown Fig. 2 is an enlarged view of one stay bolt. showing its connection withthe sheets, the sleeve and nut being shown in section and the holt'broken away at. its center Fig. 3 is a view in section showing the. Tate flexible seat. Fig. at is a plan view ofa portion of Fig. 1 and Fig. 5 is a view showing the usual method of attaching the stay bolt 'to the roof sheet. I

1 represents the-roof sheet and 2 the crown sheet connected by the bolts In the present instance I have shown in Fi 1, the roof sheet composed of a double thickness, the in-' nor plates 1 being riveted to the outer plates as clearly shown in Fig. 1. This roof ,sheet, or -the outer plates 1 of the roof sheet, is provided at certain. points, with seats 4:" which latter project outwardly from the sheet, and are formedby forcing the metal, by (lies or'otherwise outwardly as shown-in Fig. 2.' The height of the seat, depends a1: together on its location on the roof sheet, but in each instance the height is such that the at right angles't'o the long diameter of the bolt Slpassing' through same. In some .situa tious as at A, where the stay bolt is int an.

formed in the seat.

. figure.

line at right angles to the inner face. of the root sheet. the scat 4 must be raised considerably. whereas with another, say bolt 13,

where the latter stands at an angle of aboutv seven degrees from a right angle. the height of the seat is much less. in each instance'the seat is of an area sut'ueieut to receive the sleeve 5, which latter is screw threaded externally andis screwed into a threaded hole This sleeve is substantially ot' the shape and construction shown in the Tate lateut X0. 753.329 granted March 1st, 1904. and forms a support for the spheris ca] not (i. which constitutes the head of the bolt 3. 'i his nut is a sphere with flattened ends, the threaded bore extending from one fiat end to the other. to receiv e the threaded ienti ofthe bolt 3. 1 screwed home into the nut. or the nut "screwed onto the bolt, the head of the latter After the bolt has been is upset or riveted nver the u perfiattened end of the nuhthus locking tie bolt to the nut as shown in Figs. 2 and 5. This spherical nut rests on the curved seat 7 formed in the sleeve. and has a free rocking movement;- therein, the lower end of the sleeve 5. below the head being flared to allow the bolt to have such free movement- The lower end of the bolt may be sccuremcto the crown sheet by screw threads and then upsetas shown at 8 in Fig. 1. or they may he provided with button heads as shown at 9- in the same 7 The outer end of the sleeves are closed by the caps screwed to the externally threaded ends of the sleeves- In the construction shown in Fig. 3,-the

correct angle for each row of staybolts therebv insurin seats at right armies to the stav m t. Z? s bolts; which can be readily machined, and

which permit of continuous threads for securing the sleeves to the sheet.

In the present methods of securing the fleiiible stay bolt sleeve to the root sheet of a locomotive boiler, the extreme angles in some locations, as at A in' Fig.1 and also in Fig. 5, do not provide for continuous thread engagement betweerrthe sleeve and sheet, consequently allowing steam and water to follow the threads left open, and eventually leaking when the parts corrode. Again, in applying the bolts all machining operatimis' shown but,

nentor rigid supports, hence it is quite impossible to secure a perfect fit between all the'b'olts and the roof sheet. By providing the roof sheet with raised seats, I overcome the above objections and cantemploy shorter sleeves 5, than can be employed directly in the curved shell of the boiler.

By this improvement the stay bolts have free movement -to cope with the differences in expansion of'the crown and roof sheets, and renders the boiler more safe and scrviceahle.

It is evident that manv slight. changes might be resorted to in the relative arrangenient of parts shown and described without departing from the spirit and scope ot'niy f sheets the fol-liter having a raised seat. the

invention hence I would have it understood that-l dtt not wish to confine myself to the exact construction and arrangement of parts Having-fully described my invention .what I claim as new and desire to secure by Letters-Patent, is:

1. The. combination with the roof and crown sheets of a boiler, the roof sheet being; provided with raised seats, of sleeves removably secured in said seats, and stay bolts and provided with heads which are loosely mounted in the sleeves In the roof sheet. V

9. 'IlleCOlltlJliltltlOIl with root and crown sheets of a boiler, the roof sheets having raised seats, the outer faces'of which are ap n'oxin ately at right angles to the stay bolts, of sleeves screwed into said seats and stay bolts secured to the crown sheets and bro vided with rounded heads loosely mounted in the sleeves in the roof sheet.

3. The combination with roof and crown sheets of a boiler the roof sheet having a series of raised seats the outer faces of which are approximately at right angles to the stay bolts, of sleeves screwed into said raised seats and stay. bolts secured to the crown sheet and provided with rounded heads screwed onto the ends'of the bolts and seated in the sleeves; I a

l. The combination with roof and crown outer face of-which is approximately at right anirlcs to the stay bolt, and a sleeve screwed into said seat. of a sta boll sc- Cured to the crown sheet, a rounded head screwed to the upper end of the stay bolt a1 resting on a; curved seat in the sleeve and a cap closing the upper end of the sleeve.

In tcstin'lony whereof, I have signed this specification in the prescnu' of two subscribing witnesses.

BENJAMIN E. D. S'IAl htllil).

Witnesses :t i

Bowls S. Bron, 'WM. 1*. McNAms.

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