IMPROVEMENTS IN THE CONSTRUCTION AND MANUFACTURE OF CAPS EMPLOYED IN SPINNING."
Year: 1881

page_text: LETTERS PATENT to David Butterfield, of Keighley, in the County of York,
Iron and Brass Founder, for an Invention of "IMPROVEMENTS IN THE
CONSTRUCTION AND MANUFACTURE OF CAPS EMPLOYED IN SPINNING."
PROVISIONAL SPECIFICATION left by the said David Butterfield at the
Office of the Commissioners of Patents on the 12th March 1881.
DAVID BUTTERFIELD, of Keighley, in the County of York, Iron and Brass
Founder. "IMPROVEMENTS IN THE CONSTRUCTION AND MANUFACTURE OF CAPS
EMPLOYED IN SPINNING."
Caps employed in spinning now in use are made of steel tubing cut the length
of the required caps, and have cast-iron plugs fitted in the tops of the caps, or the
caps are cast entirely of iron.
The improved caps according to this Invention are made of cast-iron and steel
hoops, which allow the manufacture of the same at a considerable reduction in
price, at the same time giving the durability of caps made with steel tubing.
For this purpose I make the body of the cap of cast iron, and the end where
the thread passes to the bobbin with a steel hoop; but the great difficulty has
been to join the iron with the steel on account of the caps having to be made with
very thin metal to make them light; and to allow of making sound caps I form
on the end of the cast iron cap a rim or projecting circle which gives the required
strength, besides assisting the spinning.
I construct my caps as follows:-I cut the hoops the required length, and cut a
screw or grooves on the top, and the width required to be inserted in the cap. I
then take the hoop and place it in a mould previously prepared to cast the cap,
and then run in the cast iron and burn the metals in. The inside top of the hoop
is made level with the inside of the cast iron cap, which leaves a space for the
thickness of the steel hoop. The projecting circular ring allows for the required
metal at the joint of the steel and cast iron, and gives the required strength to
firmly secure the steel and iron together, besides allowing of making level caps,
and preventing bad castings and waste.
The caps after having been cast may have the projecting circular rings turned
off, and the caps after having been cast are turned and finished in the usual way,
by which means I effect a great saving in the construction and manufacture of caps
employed in spinning.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said David Butterfield in the Great Seal Patent Office on the
9th September 1881.
DAVID BUTTERFIELD, of Keighley, in the County of York, Iron and Brass
Founder. "IMPROVEMENTS IN THE CONSTRUCTION AND MANUFACTURE OF CAPS
EMPLOYED IN SPINNING."
The caps now generally employed in spinning are made of steel tubing cut the
length of the required caps, and have cast iron plugs fitted in the tops of the caps,
or the caps are cast entirely of iron.
The improved caps according to this Invention are made of cast iron and steel
hoops, which allows of the same being manufactured at a considerable reduction
in price, at the same time giving the durability of the caps made. with steel
tubing.
For this purpose I make the body of the cap of cast iron, and the end where the
thread passes to the bobbin with a steel hoop; but the great difficulty has been to
join the iron with the steel on account of the cap having to be made with very
thin metal to make them light; and to allow of making sound caps I form on the
end of the cast iron cap a rim or projecting circle which gives the required strength
besides assisting the spinning..
I construct my caps as follows:-I cut the hoops the required length, and cut a
screw or grooves on the top, and of the width required to be inserted in the cap.
I then take the hoop and place it in a mould previously prepared to cast the
cap, and then run in the cast iron and burn the metals in. The inside top of the
hoop is made level with the inside of the cast iron cap, which leaves a space for
the thickness of the steel hoop. The projecting circular rim allows for the required i
metal at the joint of the steel and cast iron, and gives the required strength to
firmly secure the steel and iron together, besides allowing of making level caps,
and preventing bad castings and waste.
The caps after having been cast may have the projecting circular rim turned
off; and the caps after having been cast are turned and finished in the usual
way.
By these means I effect a great saving in the construction and manufacture of
caps employed in spinning.
But in order to make my improvements better understood I will proceed to
describe the same by reference to the accompanying Drawing, in which Figure 1:
represents a sectional elevation of a cap heretofore employed in spinning, and
Figure 2, elevation of the same; the said cap is herein shewn in order that the
difference between the improved cap and the ordinary one may be readily under-
stood from a comparison of the respective Figures; Figure 3 represents a sectional
elevation of the improved cap, and Figure 4, elevation of the same.
The ordinary cap, Figures 1 and 2, may be described as being made with a steel
tube A cut the length of the required cap and having an iron top or plug B, or
the cap may be cast entirely of iron. It follows therefore that the excess of the
steel tube is not necessary, the bottom of the tube being the only part required for
'the thread to pass from the cap to the bobbin.
My improved caps are made (as shewn in Figures 3 and 4) with steel hoops D
cut the required length, and the ends E, required to be inserted in the body F of
the caps, are cut with a screw or with grooves. The hoops thus prepared are
placed in a mould previously prepared to cast the cap. The metal is then run in
the mould, and the metals are burnt in; and to join the steel and cast-iron
together a rim or projecting circle G is cast on the end of the body of the cap which

page_text: gives the required strength. The inside H of the cap in steel and iron is level, and
the steel hoop leaves a space in the cast iron rim or projecting circle G for the
thickness of the steel hoop, the rim giving the required strength to firmly secure
the steel and iron together. The caps after having been cast may have the rim or
projecting circle turned off, but I prefer leaving them on as they prevent friction
by the thread when passing from the cap to the bobbin, preventing breakage and
waste. The caps are finished in the usual way.
Having thus described my improvements, and the best means I am acquainted
with for carrying the same into effect, I would have it understood that I do not
confine myself to the precise details shewn and described, as they may be varied
without departing from the peculiar character of the Invention, but what I do
claim is,
The manufacture of improved caps having steel hoops and cast iron bodies made
with a rim or projecting circle to give the required strength to firmly secure the
steel and iron together, substantially in the manner and for the purpose herein
described and represented in the accompanying Drawing.
In witness whereof, I, the said David Butterfield, have hereunto set my
hand and seal, this Eighth day of September, in the year of our Lord
One thousand eight hundred and eighty one.
Witness,
WALTER JAS. TURNER, C.E.,
Patent Agent,
Bradford.
DAVID BUTTERFIELD. (L.S.)