Improvements in the Manufacture of Spring Hoops.
Year: 1890

page_text: Date of Application, 26th June, 1890
Complete Specification Left, 25th Oct., 1890-Accepted, 13th Dec., 1890
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Spring Hoops.
THOMAS HURDLEY of 38 Industry Road Darnall near Sheffield in the County of
York, Blacksmith, do hereby declare the nature of my said invention for "IMPROVE-
MENTS IN THE MANUFACTURE OF SPRING HOOPS to be as follows:-
"
.:)
This invention relates to improvements in the manufacture of double lugged spring
hoops which have been previously forged by hand but by this invention I manufacture
them by machinery at one heat and at less cost.
In manufacturing the said spring hoops I use top and bottom dies placed in either
a steam or hydraulic press or hammer, the bottom die is formed with projections and
recesses or spaces to suit the pattern of hoop required, these projections may be either
loose or cast solid, with the die.
The iron or steel is heated to a welding heat and a piece is placed down each side,
in the bottom die and two short pieces bent to a half circle placed at each end.
The top die is constructed to correspond with the bottom one having tapered
projections one at each end so, that when it is forced into the bottom die it welds the
two short pieces forming the cross bars in the hoop to the side pieces, thus forming a
hoop more perfect in shape and finish than when manufactured by hand.
Dated this 25th day of June 1890.
GARLICK & M GOWAN,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Spring Hoops.
I THOMAS HURDLEY of 38 Industry Road Darnall near Sheffield in the County of
York Blacksmith do hereby declare the nature of my said invention for "IMPROVE-
"and in what manner the same is
to be performed to be particularly described and ascertained in and by the following
statement:-
MENTS IN THE MANUFACTURE OF SPRING HOOPS
This invention relates to improvements in the manufacture of single or double
lugged hoops for springs which have been previously forged by hand, but by this
invention I manufacture them by machinery at one heat and at less cost.
In the manufacture of these said spring hoops I use top and bottom dies placed in
either a steam or hydraulic press or hammer, the bottom die is formed with pro-
jections and recesses or spaces to suit the pattern of hoops required. These projections
may be either loose or cast solid with the die whilst the top die is constructed to
correspond with the bottom one, having the projections or pieces to form the shape of
hoop either loose or cast thereto.
In manufacturing the said spring hoops I forge or cast from iron or steel a rough
shaped hoop, each shoulder being filled with steel to produce the thickness required;
it is placed in the bottom die at a welding heat and by the pressure of the top die
welds the whole into one solid hoop without any joints or rivets and is arranged that
the fibre in the metal runs all one way thus adding to the strength.
The accompanying drawings illustrate my invention.
Fig. 1. is a sectional plan shewing case or bottom die A with hoop B in position
after being pressed under the hammer shewing in dotted lines the joints that were
before welding. Care two pieces or keys forming the cranked portion whilst D is the
centre piece or key to form the hoop, E are two grooved pieces placed in the bottom
die to shape the ends.

page_text: Fig. 2. is a longitudinal section in elevation shewing the above parts with a bottom
piece F to receive the centre key D the dotted lines shewing the ends of the hoop B
in this case rounded also the grooved pieces or keys E to shape the ends of the
hoop.
Fig. 3. is a plan of rough hoop shewing the wedges or pieces G of metal to give
the thickness required also shewing the joint at H this is before it is placed in the
bottom die.
Having now particularly described and ascertained the nature of my said inven
tion and in what manner the same is to be performed I declare that what I
claim is
Improvements in the manufacture of single or double hoops for springs being
either forged or cast from iron or steel in a rough shape and placed in a bottom tool
having recesses or projections to suit the pattern of hoops required.
The top tool being constructed to correspond with the bottom one having projections
so that when the hoop is placed at welding heat in the bottom die the projections on
the top die being forced under a steam hammer or by hydraulic pressure welds the
whole into one solid hoop shaping it at the same time as hereinbefore specified,
described and as illustrated by the accompanying drawings.
Dated this 20th day of October 1890.
GARLICK & MCGOWAN,
Agents for the Applicant.