An Improved Butt-end Shell Strap for Steam Boilers and other similar Structures.
Year: 1892

page_text: Date of Application, 14th Jan., 1892-Accepted, 20th Feb., 1892
COMPLETE SPECIFICATION.
An Improved Butt-end Shell Strap for Steam Boilers and other
similar Structures.
I, ROBERT SHEARD, of the firm of Messrs. Spurr, luman and Co., Limited,
Wakefield, in the County of York, Boiler Makers, do hereby declare the nature
of my said invention, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
This invention of an improved butt-end shell strap for steam boilers and other
similar structures has for object to impart greater strength to such structures than
has heretofore been usual. This I accomplish by making such butt-end shell straps
broader at suitable intervals transversely to the butt-joints of the shells by means
of parts I call claws so as to admit of extra series of rivets further from the said
joints than is usually the case so as to assist in holding the butt-joints together.
I place one of my improved butt-end shell straps on the inside and one on
the outside of each sectional part of a boiler or other structure directly over a butt
or meeting of the shell plate ends and which when rivetted effect a junction of the
said abutting ends.
Where an improved butt-end shell strap meets the end of an adjoining section of
a shell it is bevilled or thinned off so as to pass beneath it in the manner usual in
boiler construction. The internal longitudinal butt-end shell strap for joining the
end section of a shell and into which a flanged end plate is usually inserted, I
connect in the same manner by thinuing its. end as just described while the outside
strap is continued to the end of such section of the shell.
In the annexed drawings,
Fig. 1 shows the development of my improved butt-end shell straps and por-
tions of three sections of a structure they are used forjoining the butt-ends thereof.
Fig. 2 is a longitudinal section in part of such structure at the butt-joint of
one section.
Fig. 3 is a partial transverse section of two portions of a shell shewing the
meeting of the butt-ends of each section with the improved butt-end shell straps in
position both inside and outside.
Similar letters refer to like parts in all the figures.
a. is the shell in part with the butt-ends meeting at the dotted line b, Fig. 1.
The meeting of the butt-ends are also shown at b 1, 1, Fig. 3. c, c, are the respective
inside and outside butt-end shell straps according to my invention as applied to the
meeting of the butt-ends, Fig. 1 and 61, Fig. 3. d, d, are the additional parts
or claws constituting the novelty in my improved butt-end shell straps by which
I am able to apply additional rivets and to take greater hold than usual of the
shell at each side of the said butt-joint b, b1, and by which I obtain greater
strength of structure.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
For use in the construction of steam boilers and other similar structures,
An improved butt-end shell-strap such as c, with additional parts "I call claws"
such as d, for more effectually joining the butt-ends b, b1, of the shells forming
steam boilers and other similar structures and for increasing the strength of said

page_text: structures, substantially as hereinabove described and shown in the drawings
annexed.
Dated this 12th day of January 1895
Witness,
THOS. E. CRAVEN,
20, Victoria Chambers, Leeds, Patent Agent.
ROBERT SHEARD.