IMPROVEMENTS IN MACHINERY FOR SHAPING SHEET METAL
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, EDMUND HENRY BURT of the firm of Burt Brothers, of N° 7, 8, 9 and 10
Edward Street, Parade, Birmingham in the County of Warwick, Coppersmiths
do hereby declare the nature of the said Invention for IMPROVEMENTS IN
MACHINERY FOR SHAPING SHEET METAL" to be as follows:-
".
My Invention consists of machinery the parts of which are constructed and
combined in the manner herein after described for shaping, by a spinning operation,
sheet metal into articles of an oval form, such as kotiles, coal vases and other oval
hollow ware.
My said Invention consists essentially in the combination of an oval block or
former, on which the article is shaped or fashioned, with two oval mechanical
chucks automatically operated, between which chucks the block or former is placed
and by which it is rotated and actuated.
One of the chucks described is carried by a revolving spindle supported by a
stationary headstock and the other and additional chuck is carried by a spindle
supported on a sliding headstock in a line with the first described headstock.
The diametrical slide of the first named chuck carries the oval block or foriner
while the diametrical slido of the other chuck carries a back centre for bearing
against and assisting in supporting the said oval block or former.
The slides of both chucks are automatically moved for producing the required
eccentric motion in the. block or former and back centre during the spinning
operation, by means of adjustable eccentrics or cams fixed on the headstocks,
against which eccentrics or cams, hooked arms or bolts on the slides bear. The
second or additional chuck may either receive its motion from the first chuck or
be driven independently at the same speed as the first chuck.
The sheet metal blank having been placed on the oval block or former, the
second or additional chuck carrying the back centre is advanced by a sliding
motion towards and its back centre inade to take a bearing against the blank on
the block or former. By the rotation of the first named chuck, the block or former
is also rotated and its motion transmitted to the second or additional chuck, and
the sheet metal blank is shaped or spun upon the oval block in the ordinary way
of spinning sheet metal. By combining the block or former with two chucks as
described, great steadiness is given to the said block or former during the spinning
operation which operation is thereby much facilitated and more perfect work
produced.
A solid oval block or former or a sectional oval block or former may be used in
the machine.

page_text: 1 EDMUND HENRY BURT of the firm of Burt Brothers of N° 7, 8, 9 and 10
Edward Street, Parade, Birminghain in the County of Warwick, Coppersmiths
do hereby declare the nature of my Invention for "IMPROVEMENTS IN MACHINERY
FOR SHAPING SHEET METAL" and in what manner the same is to be performed
to be particularly described and ascertained in and by the following statement:-
My Invention consists of machinery the parts of which are constructed and
combined in the manner herein after described for shaping by a spinning operation
sheet metal into articles of an oval form, such as kettles, coal vases and other oval
hollow ware.
Aly said Invention consists essentially in the combination of an oval block or
former, on which the article is shaped or fashioned, with two oval mechanical
chucks automatically operated between which chucks the block or former is placed
and by which it is rotated and actuated.
One of the chucks described is carried by a revolving spindle supported by a
stationary headstock and the other and additional chuck is carried by a spindle
supported on a sliding headstock in a line with the first described headstock. The
diametrical slide of the first named chuck carries the oval block or former while
the diametrical slide of the other chuck carries a back centre for bearing against
and assisting in supporting the said oval block or formner.
The slides of both chucks are automatically moved for producing the required
eccentric motion in the block or forner and back centro during the spinning
operation by means of adjustable eccentrics or cams fixed on the headstocks,
against which eccentrics or cams hooked arms or bolts on the slides bear. The
second or additional chuck may either receive its motion from the first chuck or
be driven independently at the same speed as the first chuck.
The sheet metal blank having been placed on the oval block or former, the
second or additional chuck carrying the back centre is advanced by a sliding
motion towards and its back centre made to take a bearing against the blank on
the block or former. By the rotation of the first named chuck the block or former
is also rotated and its motion transmitted to the second or additional chuck and
the sheet metal blank is shaped or spun upon the oval block in the ordinary way
of spinning sheet metal.
Figure of the accompanying Drawing represents in side elevation; Figure 2 in
plan and Figure 3 in cross section, taken on the line a Figure 1, machinery for
shaping sheet metal into hollow articles of an oval form, constructed according to
my Invention.
The same letters of reference indicate the same parts.
g
a is the ordinary oval mechanical chuck carrying the oval block or former bon
which the article is spun or fashioned. The chuck a is carried by the rotating
spindle c working in bearings in the stationary headstock d on the bed e of the
machine; is the additional oval mechanical chuck carrying the back centre for
assisting in supporting or for steadying the oval block or former b on the chuck a
and for holding the blank on the block or forner. The additional chuck fis
carried by the spindle h rotating in bearings on the sliding headstock the
spindles of the two headstocks being situated in the same line. The back centre g
may either be made of wood or of metal. The sliding headstock i works in a
dovetail seat at (see Figure 3) on the bed c of the machine and its position is
adjusted by the screw taking into a screw box in the said headstock, the said

page_text: screw being worked by the hand wheel 3; m is the diametrical slide of the
chuck a tho said slide m carrying the oval block or former b and n is the
diametrical slide of the chuck f carrying the back centre g. The diametrical
slides m n of the two chucks aro automatically moved for producing the required
eccentric motion in the block or former band back centre g during the spinning
operation by means of adjustablo eccentrics or cams p, p fixed on the headstocks d
and against which eccentrics or cams hooked arms or bolts q, q on the diametrical
slides m, n bear. The shape of the eccentrics or cams p, p and the arms by which
they are fixed to the headstocks, is best seen in Figure 3. As the arrangement of
parts for giving tho eccentric motion to the block and back centre is the saine as
that employed in ordinary oval lathes and constitutes no part of my Invention
I do not consider a further description of the same necessary.
The chuck a carrying the block or former b is driven by the driving pulleys at r
and the second or additional chuck f may be driven by the driving pulleys at s
at the same speed as the first chuck a, but the additional chuck f may receive its
motion from the first chuck a through the block b and the metal being operated
upon. Or instead of driving the two chucks a, f by driving pulleys and belts
they may be driven by toothed gearing.
The sheet metal blank Figure 1 having been placed against the block or
former the second or additional chuck carrying the back centre y is advanced
by a sliding motion towards and its back centre g made to tako a bearing against
the blank on the said block or former b as represented in Figure 1. One or both
of the chucks being now rotated, the block b and back centre g are also rotated at
the same speed and the sheet metal blank is shaped or spun upon the oval block b
as represented in Figure 2 in the ordinary way of spinning sheet metal.
An ordinary T rest or a slide rest (not represented in the Drawing) may be
used for supporting the spinning or pressing tool as is well understood.
By combining the block or former with two chucks as described and illustrated,
great steadiness is given to the said block or former during the spinning operation
which operation is thereby much facilitated and more perfect work produced.
A solid oval block or former or a sectional oval block or former may be used in
the machine.
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:-
The combination in machinery for shaping sheet metal by a spinning operation
into hollow articles of an oval form of two oval mechanical chucks carrying
respectively the oval block or former on which the article is shaped and a back
centre for assisting in supporting or for steadying the said oval block or former
and holding on the blank, the said back centre being supported upon a sliding
headstock, the several parts being constructed and acting substantially as herein-
before described and illustrated in the accompanying Drawing.