Improvements in the Manufacture of Hoops for Laminated Springs
Year: 1894

page_text: Date of Application, 26th Oct., 1894
Complete Specification Left: 23rd July, 1895-Accepted, 24th Aug:, 1895-
PROVISIONAL SPECIFICATION:
Improvements in the Manufacture of Hoops for Laminated Springs:
We THOMAS TURTON & SONS, LIMITED, of Sheaf Works, in the City of
Sheffield; Manufacturers, and JEREMIAH ROBERTS, of the same address, Manager,!
do hereby declare the nature of our invention to be as follows:-.
Our present invention relates to the process of manufacture of the hoops or
buckles used in the construction of laminated springs, and more particularly to the
forging of such hoops as are described in our prior Specification of Patent
No. 374, 1890, and other like hoops, by which additional strength is obtained' at
the welds, and in the ends through which the bolts are passed; we also avoid'an
excess of metal at the ends.
The method described in the above mentioned Patent is to make two end-pieces ·
by bending a bar of iron into a squared U-shape, and to weld upon each side near
the base, a side plate of the desired length.
It is desirable in some patterns of hoops to increase the strength- of arms of the
end pieces by carrying the side bars to their extreme ends, and in order to avoid*
an excess of the metal at the ends, to save labour in hammering them down to size,
and to ensure a more perfect weld at the junction of the side bars and the end
pieces, we propose therefore to make the end pieces with tapering arms, such taper
being made either upon the inside or upon the outside of the arm, but preferably
upon the outside as this leaves the inside of the opening square, as required:
The side bars may also be tapered' at their ends, but this is not essential.
This new principle of tapering the arms of the end; pieces for the purposes before
named though appearing trivial and simple, we find of considerable advantage in,
the process of manufacture, both with regard to economy and in producing, a
reliable hoop.
1
1000
ROBT. F. DRURY, C:P:A.;
George Street, Sheffield, Agent for Applicants:
COMPLETE SPECIFICATION!
Improvements in the. Manufacture of Hoops for Laminated Springs.
We, THOMAS TURTON & SONS; LIMITED, of Sheaf Works; in the City of
Sheffield, Manufacturers, and JEREMIAH ROBERTS, of the same address, Manager,
do hereby declare the nature of this invention and in what manner the same has to
be performed, to be particularly described and ascertained in and by the following
statement :-
Our present invention relates to the process of manufacture of the hoops used in
the construction of laminated springs, and more particularly to the forging of such
hoops as are described in our former Specification No. 374 of 1890, and other like
hoops, the object being to obtain additional strength at the welds, and in the ends
through which the bolts are passed. Excess of metal at the ends where it is not
required is also avoided.

page_text: Our invention is illustrated in the annexed sheet of drawings in which similar
letters of reference indicate similar parts, in any of the several figures.
Fig. 1, is a plan of a hoop.
Fig. 2, is the edge view of a side plate or bar.
Fig. 3, is the edge view of side plate in juxta-position with the two cud pieces.
The method described in the above mentioned Patent, is to make two end pieces
by bending a bar of iron into a squared U shape, and to weld a side plate of the
desired length upon each side of the end pieces near the base.
To increase the strength or thickness of the arms of these end pieces, through
which the drawbar pin passes, it is usual in some cases to carry the side plates to the
extreme ends of the end pieces, the parts being welded together, and the increased or
doubled thickness being hammered down to size.
Now in hoops made according to our invention we avoid an excess of iron at
the extreme ends, we save the labour of hammering down to size, and we ensure a
more perfect weld at the junction of the two parts.
In carrying out our invention, we taper each arm of the end pieces A, the tapering
being made preferably upon the outside face from a', to a³, leaving the intermediate
opening B, rectangular as desired.
The corners a, are drawn out or "scarfed" as is usual for welding.
The side bars or plates C, are also tapered from c', to c², as shown in Fig. 2, and
are knocked in as shown in Fig. 3, to conform to the angle of the end piece, or
thereabouts.
The tapering of the side plates C, is however not so essential as tapering the
arms of the end piecės A.
When the parts so formed are brought to the proper heat and put together to
weld, the bulk of the hammering is given at D, Fig. 1, to set down the material to
shape, and this ensures a sound weld in the corners E.
The smaller amount of metal at the tapered ends prevents the spreading and
elongation of these parts, and avoids waste of material.
Our improvements as herein before described are simple and may appear trivial,
but the result is satisfactory and of considerable importance both with regard to
producing a sound and perfectly welded hoop, and to economy of manufacture.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is :
1. The improvements in the manufacture of hoops for laminated springs,
consisting of the tapering of the ends of the side plates C, and of the arms of the
end pieces A, before they are welded together, for the purpose specified and as
herein before described, with reference to the drawings.
2. In the manufacture of hoops for laminated springs, tapering the arms of the
end pieces A, before welding on the side plates C, for the purpose specified,
and as herein before described and shown in Fig. 3 of the annexed drawings.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicants.