Improvements in Stays for Boilers, Tanks, Pans, and the like.
Year: 1891

page_text: Date of Application, 22nd Sept., 1891-Accepted. 24th Oct., 1891
COMPLETE SPECIFICATION.
Improvements in Stays for Boilers, Tanks, Pans, and the like.
We, THOMAS BARROW and JOHN BAKER ROACH, of Chester, in the County
of Delaware, State of Pennsylvania, United States of America, Mechanic and
Shipbuilder, do hereby declare the nature of this invention and in what manner
the same
to be performed, to be particularly described and ascertained in and by
the following statement :-
The invention relates to boiler stays and it is adapted to be used for marine,
locomotive, portable and vertical boilers, hollow bottom tanks or pans or in fact
anything that requires stays.
The stays that are in general use are parallel or straight and are screwed in
from the outside of the boiler shell and when they get into the "bore" they are
slack and therefore require a nut on them on the inside of the box to take up the
slack and make them strong enough.
Whereas our stays are not of an equal diameter throughout and have enlarged
heads provided with screw-threads. They are screwed in from the inside of the
box and the further they are screwed in the tighter they get. Further the nut
now used on the inside of the box is by our construction entirely dispensed with.
The openings in the "box" through which the stays pass are made larger at one
end than at the other thus forming a tapering opening which are provided with
screw-threads thus enabling the head of the stays to be countersunk.
In the drawings:
Fig. 1 is a sectional view of a boiler and its shell with our stay attached.
Fig. 2 is an enlarged detail view.
Fig. 3 represents boiler braces having the enlarged head.
Fig. 4 is an enlarged view of the same.
A represents a boiler of usual construction having the usual attachments and
B is the shell commonly used on boilers. The boiler A. is provided with holes a,
which are screw-threaded and vary in diameter from top to bottom. b are holes
in the shell B which surrounds the boiler. These holes b, register with the
holes a. C, C, C are the boiler stays which are each provided with enlarged
tapering and screw-threaded heads c, c¹, and c².
The stay C, as above stated has the tapering head c, and a square projection or
lug c, and at its other end has a thread cut in the usual manner. The stay C
has the tapering head and a lug or projection similar to the stay C, but the other
end of this stay is swelled and then the thread is cut. By swelling the end of the
stay we get the full strength of the body of the same. The stay has a tapering
head and lug or projection similar to the stays hereinbefore described. The lower
portion of this stay tapers slightly and is provided with screw-threads as shown.
The stays have square lugs or projections c, c and c.
In practice the stay is screwed in from the inside of the boiler. The head of
the stay being tapered is countersunk in the boiler thus dispensing with the nut
usually used and further, the stay is protected from the action of the steam and
water.
After the stay is nearly screwed up from the inside we place a wrench on the
projection on the opposite end of the stay and draw the stay up tightly thus securely
and effectively stay the shell to the boiler.
This stay may be used as a fore and aft brace D, D, for boilers of any size and
when thus used effects a saving of three nuts on each of said braces.
In the braces now used four nuts are required whereas with our improved brace
only one nut is necessary.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:-
1. A boiler stay or brace having one end provided with a tapering screw-thread
and the other end also provided with a screw-thread, and an intermediate smooth
portion, substantially as described.
2. The combination with the boiler and its shell, of a stay tapered and screw-
threaded at intervals throughout its entire length, substantially as described.
3. The combination with a boiler provided with holes tapering from the inside
and screw-threaded and its shell, of a stay tapered and having alternate smooth
and screw-threaded portions whereby the stay is adapted to be inserted from the
inside of the boiler, substantially as described.
Dated this 22nd day of September 1891.