DICSCOU Door Knobs and other simılar Articles
Year: 1888

page_text: Date of Application, 8th June, 1883
Complete Specification Left, 7th Mar,, 1889
Complete Specification Accepted, 11th May, 1889
DICSCOU
Door Knobs and other simılar Articles
We WILLIAM GEORGE MACVITIE of York Villa Maney, Sutton Coldfield in the
County of Warwick, Brass Founder and ISAAC WHITEHOUSE of Institute Works
Howard Street Birmingham in the County of Warwick Manufacturer, do hereby
declare the nature of our said invention to be as follows
Our invention has for its object improvements in the manufacture of the mounts
for the handles of door knobs and other similar articles which have hitherto been
cast on account of their peculiar shape, which has made them costly and not so
accurate and regular in thickness as could have been desired and hitherto it has been
considered impossible to stamp or press these mounts on account of the great
reduction in the thickness of the metal when the ordinarily known process of
stamping in dies has been applied thereto
Our invention therefore relates to new mode by which we are enabled to
maintain or even increase the thickness of the metal where otherwise it would hive
been rendered too thin to be of any practical service
In making these mounts we first cut a disc considerably larger in diameter than
would generally be used for the purpose We then make a deep large bulge it the
centre thereof which contracts the diameter of the disc We then forin a die
having a recess into which this bulge disc fits the die being fitted at the centre
with changeable pegs of which there ir number of sizes The bulge disc is now
placed over the peg and in the recess of the die and top tool is brought to bear
upon the outer portion of the bulge in such a manner as to reduce and compress it
Inwards towards the said peg In doing this the tendency of the disc is to gain
enlarge in its diameter to approach the original shape of the plite but owing to
the outer edge being held in the recess of the die, the plate is unable to regam its
shape and the metal is thus contracted and thickened at the centre part so as to form
a basis from which we afterwards make the square socket of the mount By the
aforesaid series of centre pegs and upper dies we gradually reduce this metal into

page_text: the exact size of square or other socket we require
We then cut the end off and
so finish them as to be of uniform size with properly squired angles and increase
in the thickness at the root of the socket as may be desired according to the purpose
for which the mount may be required or in any case we are enabled to insure no
decrease in its thickness The outer edges of the disc are then turned down in
suitable tools so as to form an outer flange for the knob In stamping and raising
metal great difficulty has hitherto been experienced on account of the tendency of the
metal to become thinner in such formations but by this new mode of treatment this
difficulty is entirely avoided
L
5
ST 1000
GEORGE BARKER,
77, Colmore Row, Birmingham,
Agent for Applicants

page_text: Door Knobs and other similar Articles
We WILLIAM GEORGE MALVITIF of York Villa Maney, Sutton Coldfield in the
County of Warwick, Brass Founder and ISAAC WHITEHOUSF of Institute Works,
Howard Street Birmingham in the County of Warwick Manufacturer do hereby
declare the nature of our said invention and in what manner the same is to
be performed to be particularly described & ascert uned in and by the following
statement
-
Our invention has for its object "improvements in the manufacture of the mounts
for the landlus of door knobs and other similar articles" which have hitherto been
cast on account of their peculiar shape which has made them costly and not so
accurate and regular in thickness as could have been desired and hitherto it has
been considered impossible to stamp or press these mounts on account of the greit
reduction in the thickness of the metal when the ordinarily known process of stamping
in dies has been applied thereto
Our invention therefore relates to a new mode by which we are enabled to in untain
or even case the thickness of the metal when it would otherwise have been
rendere too thin to be of iny practical service
In making these mounts we first cut a disc considerably luger in diameter thin
would generally be used for the purpost We then nike a deep large bulge at the
centre thereof which greatly contracts the dimeter of the disc We then form a die
having recess into which this bulge disc fits the die being fitted at the centre with
changeable pegs of which there are number of sizes The bulge disc 1 now placed
over the peg and in the recess of the die and top tool is brought to bear upon the
outer portion of the bulge in such a minner is to reduce and compress it inwards
towards the said peg¸ In doing this the tendency of the disc is to again enlirge in its
diameter to approach the original shape of the plate, but owing to the outer edge
being held in the recess of the die The plate is unable to regain its shape and the
metal is thus contracted and thickened it the centre part so as to form i bisis from
which we afterwards make the square socket of the mount By the aforesaid series of
centre pegs and upper dies we gridu illy reduce this metal into the act size of
square or other socket we require We then cut the end off and so finish them as to
be of uniform size with properly square angles and increase in the thickness at the
root of the socket as may be desired recording to the purpose for which the mount
may be required or in any case we are enabled to insure no decrease in its thickness
The outer edges of the disc are then turned down in suitable tools so as to form an
outer flange for the knob In stamping and raising metal great difficulty has hitherto
been experienced on account of the tendency of the metal to become thinner in such
formations but by this new mode of treatment this difficulty is entirely avoided
In order that our invention may be clearly understood and more easily carried
into practice we have appended hereunto a sheet of drawings upon which we have
llustrated the various processes required in the manufacture of these mounts
Figure 1 is a section through the die B and the bulged disc ▲ in position

page_text: Figure 4 is an elevation or the buigen (list A
Figure 3 is a plan of Figure 2
Figures 45 & 6 are elevations of the disc after undergoing the three succeeding
operations
Figure 7 15 a plan of Figure 6
Figures 8 & 10 an elevation of the two last operations for squaring the socket of
the mount
Figures 9 & 11 are plans of Figures 8 & 10 respectively
Figure 12 is a section through the mount when completed shewing the end of the
socket pierced and the disc turned up it the edges
In making these mounts we first cut a disc considerably larger in diameter than
would generally he used for the purpose and then make a deep large bulge A¹ at the
centre thereof as shewn in Figure 2 which greatly contracts the diameter of the disc
We then form the die B shewn in Figure 1 the recess into which this bulge disc A
fits the die being fitted at the centre with the changeable pegs E of which there
are a number of sizes The bulge disc A is now pliced over the peg E and in the
recess of the die B and a top tool brought 10 bear upon the outer portion of
the bulge A¹ in such a minner as to reduce it and compress it inwards towards the
sud peg E
In doing this the tendency of the disc A is to gun enlurge in its
diameter to approach the original shape of the plate but owing to the outer edge a³
being held in the recess b¹ of the die B the plate is unable to regun its shape and
the metal is thus contracted and thickened at the centre part so as to form a basis from
which we afterwards make the square socket of the mount as shewn by Figure 11
By the afores ud processes and series of centre pegs and upper dies we gradually
reduce thuis met il bulge A¹ both in height and width into the exact size of square
or other socket we require We then cut the end a³ off as shewn by Figure 12 ind
so finish them as to be of uniform size with properly squared angles and increase in
the thickness at the foot of the socket as may be desired, according to the purpose
for which the mount may be required or in any case we are enabled to ensure no
decrease in its thickness The outer edges of the disc are then turned down in
suitable tools as shewn by a Figure 12 so as to form in outer flange for the knob
We do not confine ourselves to either the particular shape of the disc or socket
which may be round square or polygonal in shape
Having now particularly described and iscertained the nature of our said inven-
tion and in what manner the sune is to be performed we declare that what we
claim 18-
The improvements in the Manufacture of the mounts for the handles of door
knobs and other similar articles by which various formations of metal may be raised
by stamping or pressing without the centre part being unduly reduced in thickness
thereby substantially as her ein set forth and shewn upon drawings
Dated her ath dL 1200