Improvements in the Manufacture of Tubular Locks.
Year: 1892

page_text: Date of Application, 29th Aug., 1892
Complete Specification Left, 29th May, 1893-Accepted, 1st July, 1893
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Tubular Locks.
We THE TUBULAR LOCK SYNDICATE LIMITED of Leadenhall Buildings,
Gracechurch Street in the City of London Manufacturers and FREDERICK
JAMES BIGGS of the same place Merchant, do hereby declare the nature of this
invention to be as follows:
In tubular locks of the class which have two side walls or "half rounds"
constituting the lock frame within an enclosing tube, as for instance in the locks
described in our Specifications Nos. 8718 and 8719 of 1890 it has been usual to
permanently fix one of the side walls to the fore plate of the lock and to make
the other side wall detachable for which purpose it has been provided with pro-
jections or tenons at its front end to enter holes in the fore plate. The fixed
side wall has hitherto either been cast in one piece with the fore plate, or it
has been formed with projections or studs at its front end which have been
Both these
passed through holes in the fore plate and then rivetted over.
methods have been found to lead to difficulties when fitting the parts of the lock
together because of the liability of the various holes formed in one side wall to
be out of truth with the corresponding holes or parts in the other side wall or
in the internal mechanism. One object of the present invention is to overcome
this difficulty. A further object is to cheapen and lighten the lock by making
the side walls from sheet metal instead of casting them in the form of "half
rounds" as hitherto.
My invention consists first in punching or stamping and pressing from a metal
sheet a fore plate having a hole for the passage of the latching bolt and at one
or both sides of said hole a lug projecting at right angles rearwardly of the
plate, such lug or lugs having an aperture or other contrivance for the attachment
of the corresponding side wall.
Secondly in permanently attaching one of the side walls to one of said lugs by a
rivet or rivets or screw or screws passed through an aperture or apertures in
said side wall and through an aperture or apertures in the lug.
Thirdly in fixing transversely near the front end of the other or detachable
side wall a stud which projects at both sides of said side wall, its projection at
the inner side being adapted to fit into an aperture of the corresponding lug of
the fore plate while its projection at the outer side when the tubular case is
in position, enters the usual slot or gap in the front end of said case and prevents
axial movement of the case.
Fourthly in manufacturing the side walls by punching and stamping them from
a metal sheet.
Fifthly in forming an inturned flange at the rear end of the one side wall, said
flange having a tongue or like device to engage with a corresponding device in
or on the other side wall and said flange having also a screw threaded hole to
receive the usual screw that is passed through the rear closed end of the tubular
case so as to secure same in place.
Dated this 20th day of August 1892
J. C. MEWBURN,
55 & 56, Chancery Lane, London, Patent Agent.

page_text: COMPLETE SPECIFICATION.
Improvements in the Manufacture of Tubular Locks.
We, THE TUBULAR LOCK SYNDICATE LIMITED of Leadenhall Buildings,
Gracechurch Street in the City of London, Manufacturers and FREDERICK
JAMES BIGGS of the same place, Merchant, do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
"
In tubular locks of the class which have two side walls or half rounds
constituting the lock frame within an enclosing tube, as for instance in the locks
described in our Specifications Nos. 8718 and 8719 of 1890, it has been usual to
permanently fix one of the side walls to the fore plate of the lock and to make the
other side wall detachable for which purpose it has been provided with projections
or tenons at its front end to enter holes in the fore plate. The fixed side wall has
hitherto either been cast in one piece with the fore plate or it has been formed with
projections or studs at its front end which have been passed through holes in the
fore plate and then rivetted over. Both these methods have been found to lead to
difficulty when fitting the parts of the lock together because of the liability of the
various holes formed in one side wall to be out of truth with the corresponding
holes or parts in the other side wall or in the internal mechanism and because in
removing locks from doors the fore plate is often wrenched off, leaving the lock
itself fixed in the door. One object of the present invention is to overcome these
difficulties. A further object is to cheapen and lighten the lock by making the
side walls from sheet metal instead of casting them in the form of "half rounds
hitherto.
as
Our invention consists first in punching or stamping and pressing from a metal
sheet a fore plate having a hole for the passage of the latching bolt and at one or
both sides of the said hole a lug projecting at right angles rearwardly of the plate
such lug or lugs having an aperture or other contrivance for the attachment of the
corresponding side wall.
Secondly, in permanently attaching one of the side walls to one of the said lugs
by a rivet or rivets or screw or screws passed through an aperture or apertures in
the said side wall and through an aperture or apertures in the lug.
Thirdly, in fixing transversely near the front end of the other or detachable side
wall a stud or studs projecting at both sides of the said side wall, the projection or
projections at the inner side being adapted to fit into an aperture or apertures of
the corresponding lug of the fore plate, while the projection or projections at the
outer side when the tubular case is in position enter the usual slot or slots in the
front end of the said case and prevent axial movement of the case.
Fourthly, in manufacturing the side walls by stamping and punching them from
a metal sheet.
Fifthly, in forming an inturned flange at the rear end of the one side wall the
said flange having a tongue or like device to engage with a corresponding device in
or on the other side wall and the said flange having also a screw threaded hole to
receive the usual screw that is passed through the rear closed end of the tubular
case so as to secure same in place.
In the accompanying drawings which illustrate the invention,
Figure 1 is a front or back view of the metal sheet or blank from which the fore
plate with its lugs is made.
Figure 2 is a similar view of the sheet or blank after the punching or stamping
operation in which are formed two parallel horizontal slots bb, a connecting
vertical slot e, the apertures d d and the screw holes e e and ff.
Figure 3 is a back view and Figure 4 a section on line 4, 4 of Figure 3 of the
fore plate when completed.
Figure 5 is a face view of the permanently fixed side wall as first stamped
from a metal sheet.

page_text: Figure o is a face view of same when the requisite holes have been punched
therein.
Figure 7 is a face view and Figure 8 a plan or top view of the same side wall
when completed.
Figure 9 is a face view and Figure 10 a plan or top view of the other or
detachable side wall when completed.
Figure 11 is a side elevation with part of the tubular case broken away, Figure 12
a section on line 12-12 of Figure 11 and Figure 13 a plan, with the tubular case,
fore and face plates and front portions of the side walls in mid-section, of the lock
frame and case.
Figure 14 is a fragmentary plan corresponding to part of Figure 13 and Figure. 15
a section on line 15-15 of Figure 14 of a lock frame and case of the same
construction as those illustrated in Figures 1 to 13 except that the side walls are
made in the form of half rounds.
In manufacturing the improved fore plate the blank or sheet a Figure 1 is first
punched by means of suitable tools, as will be well understood, with the slots bb
and c, apertures dd (of which there may be one or more on each side) and the usual
screw holes e eff as seen in Figure 2. Then after the holes ee have heen counter-
sunk for the heads of the screws that are to fix the lock to a door the tongues gy
Figure 2 between the slots bb and having the apertures dd are forced out by
means of a suitable press so as to form lugs (see gy Figures 3 and 4) projecting at
right angles rearwardly of the fore plate a, thereby leaving a hole for the
passage of the usual latching bolt. The fore plate is thus completed except that
it may be polished or "finished" if thought desirable and that the aperture or
apertures dd on one tongue (Figure 2) will generally be tapped to receive the
screw or screws by which the permanently attached side wall is fixed.
り
In manufacturing the side wall that is to be permanently attached to the fore
plate a metal sheet or blank is first stamped of the required outline as seen at i in
Figure 5, then this sheet is punched with the requisite holes-see Figure 6; the
form and position of these holes will of course vary in different locks and will chiefly
depend upon the construction or arrangement of the mechanism to be fitted in the
locks. Next after the key slot k has been cut and the rearmost hole has been
tapped the sheet is stamped or pressed into the form seen in Figures 7 and 8, that
is to say, the front portion m is bent outwards so as to lie conveniently upon the
lugg of the fore plate and the rear. end is flanged inwards at the tapped holel
being in the flange.
is
The detachable side wall n in Figures 9 and 10 is manufactured in a similar
manner, that is to say, a metal sheet or blank is first stamped of the required
outline; then this sheet is punched with the requisite holes; next after the key
slot has been cut the front portion m is bent outwards. Subsequently the stud p
is fixed into the hole in the front portion m the said stud projecting at both sides
of the hole, its inside projection being for the purpose of attaching the side wall
to the corresponding lug g of the fore plate for which purpose the said projection
is made to enter the aperture d of the lug the outer projection of the stud
to receive the usual slot or gap in the front end of the tubular case see
Figure 11. It will be seen that the flange j of the side wall i has a tongues and
that near the rear end of the side wall n is a slot s' Figures 9 and 10 which when
this side wall is in place the tongues enters-see Figures 11 and 13. This
connection of the rear ends of the two side walls serves to keep them at the proper
distance apart and to assist in retaining the detachable side wall in place and the
stamped holes or incisions in perfectly opposite positions. It is obvious that the
flange may be on the wall n instead of as shown on the wall and that various
fornis of connection may be substituted for the tongue and slot connection
illustrated. The tapped hole in the flange comes immediately in line with the
usual central screwhole t in the end of the tubular case-see Figures 11 and 13, so
that the usual fixing screw can be passed through the hole t and screwed into the
hole

page_text: It will be seen on reference to Figure 12 that the outer faces of the walls i and n
are bevelled at their upper and lower edges to the curve of the tubular case r
which fits them. This gives sufficient bearing or internal support for the tubular
case, although of course not so much as is given by the half rounds hitherto adopted
in locks of this class.
Figures 12 and 13 is the usual stump fixed in the hole Figures 6 and 7 of the
side wall i. Figures 11 and 13 is the usual face plate screwed to the fore plate a.
Figures 14 and 15 will be understood without further explanation, but it may
be stated that they represent a lock the fore plate a of which is made with lugs g
in the manner already explained while the side walls consist of half rounds of the
old form except that their front portions mm are made like those of the side walls
shown in Figures 7 to 10 so as to be attached to the lugs g as hereinbefore
explained.
It will readily be understood that when the side walls are made by punching
and stamping them from metal sheets perfect accuracy and uniformity in the
positions of the various holes is obtained so that when two corresponding side
walls are attached to the same fore plate every hole in each plate comes perfectly
true as regards its position relatively to the corresponding holes or parts in the other
plate and to the internal mechanism when this is subsequently placed in the lock.
Such accuracy and truth cannot be obtained without the care and expense of
skilled workman when the walls are cast and the holes are subsequently cut out or
drilled as has hitherto been the practice.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. In manufacturing a tubular lock, the production, by punching or stamping
and pressing as hereinbefore described of a fore plate having a hole for the passage
of the latching bolt and at each side of the said hole a lug projecting at right
angles rearwardly of the said plate and adapted to be connected to a side wall of
the lock, substantially as set forth.
2. In a tubular lock, a fore plate having a lug projecting at right angles
rearwardly of the said plate in combination with a side wall of the lock
permanently attached to the said lug, substantially as set forth.
3. In a tubular lock, a fore plate having a lng projecting at right angles
rearwardly of the said plate in combination with a side wall of the lock having
a stud or studs to engage with an aperture or apertures in the said lug whereby the
said side wall can be attached to or detached from the said fore plate at will,
substantially as set forth.
4. In a tubular lock, a detachable side wall having near its front end a transverse
pin or pins or stud or studs projecting at both sides of the said side wall, the inner
projection or projections being adapted to engage with a lug on the rear of the
fore plate and the outer projection or projections with a slot or slots at the front
end of the tubular case of the lock, substantially as set forth.
5. In manufacturing a tubular lock, the stamping and punching of the side
walls of the required configuration and with the required holes from metal sheets,
substantially as set forth.
6. In a tubular lock, a side wall having an inturned flange at the rear end and
a tongue on the said flange, in combination with an opposite side wall having a slot
to engage with the said tongue whereby the said side walls are kept at the proper
distance apart, substantially as set forth.
7. The manufacture of tubular locks as hereinbefore described and represented
in the accompanying drawings.
J. C. MEWBURN,
55 & 56, Chancery Lane, London, Chartered Patent Agent.