Year: 1887

page_text: Date or Application, 2nd Sept., 1887
Specification Accepted, 28th Oct.. 1887
A
JUBN
York, in the Province of Ontario, Canada, Master Plasterer, and JOSE
ALEXANDER BANFIELD, of the same place, Broker.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E. 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 :-
The object of the invention is to provide a combined lock and latch which is capable of
being applied to the ordinary door bolt and which is readily convertible from an
ordinary latch capable of being opened by the knobs either inside or outside into one
in which the outer door knob is free to move when turned without unlocking the door
and only rendered capable of acting when a latch key is inserted into the outer door
knob so as to engage with a lug formed on a single spindle which connects the
door knobs and actuates the latch as hereinafter explained.
Figure 1 is a perspective view of the device partially in section and broken away.
Figure 2 is a section through cylinder tumbler cylinder and end of spindle, showing
key inserted.
Figure 3 is a detail of cylinder tumbler.
Figure 4 is a view of the flat key.
Figure 5 is a section through cylinder and tumbler on line a b shown in Figure 2.
In the drawings like letters of reference indicate similar parts in the different
figures.
In figure 1 A is the inside door-knob with removable top held onto the squared end
of spindle by screw a. In the shank of the knob there is a slot 6 through which a
pin B is adapted to work. C is a knob-rose of ordinary make. This pin B is passed
through a hole in the slide D which works in a groove formed in the squared portion
of the spindle E to receive the pin B and to allow for play so that the pin may work
to and fro when actuating the slide, there is a triangular recess cut out of the spindle c
and the pin B is provided with a collar d to prevent it being taken out or accidentally
removed from the spindle through slot 6 in the shank. F is a section of the door
D

page_text: through which the spindle E passes. G is the tumbler for bolt of ordinary
construction rigidly fixed to the spindle and to the collar e on the spindle. The shoulders
on the tumbler engage with the fugs f formed on the arms f¹ of an ordinary spring
bolt of which is the latch. The spring or its bearings which shoots the bolt
forward is not shown as no part of the bolt is claimed as the invention. The normal
condition of the latch or bolt is that of being shot forward into the latch by the spring
and the turning of the spindle compresses the spring and draws back the latch in the
usual manner.
is a lug formed on the slide D adapted to engage in a slot g¹ formed
in the base of the shank of outer door knob and a corresponding slot in the enlarged
cylindrical portion of spindle E. The end of this cylindrical portion / has a circular
recess formed therein (vide also Figure 2) to receive the rounded lug K formed at end of
cylinder tumbler N. Projecting beyond the end of cylindrical part of spindle h
is a hook-shaped projection h' which forms part of spindle and stands out beyond it so
as to form a stop to prevent spindle being drawn away from shank O of outer door-knob
and is also adapted to act as a stop for the key so as to move the spindle E when
unlatching or unlocking the door. This cylindrical part of spindle h has a circular
ring cut out of it all round to admit of a pin J passing by the rounded central portion
of spindle and holding the outer door knob K onto the spindle; the outer door knob
being free to rotate while lug g is disengaged from slot g'. The head of this pin J is
countersunk in the shank and covered by the knob-rose C which is immovable being
held in place at the shoulder by the end of the shank O of outer door-knob
which is held down against it by the screw a on the inside door-knob. L is a
cylinder formed on the lower half of door knob and extending to near the top of
upper half of knob. This cylinder is slotted at n to receive the guard M which has
wards to which the wards in the key must be adapted so as to allow only of the
introduction of the proper key. This guard M has T-shaped projections one inside
and the other outside the cylinder to keep the guard in place. N is the cylinder
tumbler a detail of which is shown at Figure 3. The rounded lug k formed thereon
fits into the circular recess at end of cylindrical portion h of spindle and is grooved to
receive the end j of flat key I. This lug k works freely in this recess. Cylinder
tumbler N is adapted to make about three fourths of a rotation in the cylinder L.
The cylinder tumbler N has a reduced outer end which is journalled to rotate in a
circular orifice formed in the upper half L' of outer door knob P having a longitudinal
slot or key hole o for the reception of the flat key I. This cylinder tumbler is
grooved along its major axis for the reception of this flat key; the inside end of this
groove appears at o' in figure 7 and extends through the lug which works in recess i
formed in the spindle and is more particularly shown in Figure 3. The upper halves
of the outer and inner knobs are removable and are lipped at p so that they may be
spun together on a lathe.
In Figure 2 which is a section through major axis of spindle shank of outer knob
cylinder and cylinder tumbler the various letters indicate the parts shown in Figure 1.
In this view the dotted line indicates the position of the wards of key referred to
in Figure 4 just before the wards of the key are about to pass through the wards of the
guard M the position of the key with reference to the wards of guard is indicated in
Figure 5 the key being turned in the direction of the arrow head so as to engage
with the stop which is integral with the main spindle which when moved as indicated
by arrow head unlatches or unlocks the door. In this Figure the outer end of the
cylinder tumbler N is shown broken away. 77 indicate the position of the ring cut
out of the cylindrical part of spindle through which the pin J is inserted.
this view the lug g on slide D is shown as in Figure 1 disengaged from the slot g' in
shank o' and slot g₁ in cylindrical portion h of spindle so that the outer knob P is free
to rotate axially without moving the main spindle E. is a slot formed in cylinder
tumbler to allow lug on spindle to rotate past cylinder tumbler. This slot t is also
shown in Figures 1 and 3.
In
Figure 3 is the detail of cylinder tumbler N which adapted to move loosely partially
around in the knob cylinder L which is integral with lower half of outer knob
(vide Figure 1) the lug k being journalled in the recess i in spindle while the portion o

page_text: forms a collar the reduced outer end not shown in this view being journalled in
an annular orifice in the upper half of outer knob P (vide Figure 1). This cylinder
tumbler is preferably made as shown though it may be any form adapted to pass freely
through the wards of guard M.
Figure 4 is a view of the special form of flat key which is suitable for the wards in
guard shown in Figures 1 and 2. The wards in the key may vary to suit the wards
adapted for the guard M.
Figure 5 is a section through cylinder and tumbler on line ab shown in Figure 2;
M being the guard showing the T shaped projections holding it in place after having been
inserted through slot in cylinder. I is a section through the key and o' the columnar
part of cylinder tumbler also shown in Figure 3. h is the cylindrical end of spindle E
and the hooked lug or projection integral therewith against which the key
presses when actuating the spindle and s is inside view of botton part of cylinder
tumbler.
Having described the different parts I shall now briefly point out the mode of
operation.
When the pin B is drawn back in the position shown in Figure 1 the outer door
knob is free to rotate axially and the door remains locked to those outside until the proper
key is inserted in place through the slot in the cylinder tumbler and turned as hereinafter
more fully explained; but when it is desired to convert it into an ordinary door latch
which may be opened from either side the door knob P is placed in position by
bringing an index mark on its shank in line with a similar index on the knob-rose Č
and then the pin B working in the slot 6 formed on the inside knob-shank is pushed
forward from the position shown in the drawing rocking on the apex of triangular
recess c and shooting the lug g into the slot g¹ formed in the shank of outer knob and
lug g² in spindle when the turning of the outer knob will cause the spindle Ę to rotate
and unlatch the door the lug g engaging against the side of the slots g' and ' when
the pin B is pulled back from the inside as shown in Figure 1 the door remains locked
from the outside the handle turning without engaging the spindle. To unlock the
door from the outside the key is inserted until its small end; enters the groove o³ in
the round lug at end of cylinder tumbler and turn to the right as indicated by
arrow head in Figure 5 when the key after passing the wards in the guard M engages
against the hooked lug h¹ integral with the main spindle E and causes it to turn and
unlock the door.
By the combination of the parts as herein described a lock is obtained requiring no
extra key hole in the lock case while it answers all the purposes of a lock and latch
combined.
The same device may be adapted to be used in doors where knob handles are not
employed by fixing the cylinder in a slot in door having the cylinder tumbler N,
journalled at one end by lug k in recess I and at the other end in a circular aperture
formed in the covering formed on the cylinder L to receive the reduced outer end of
the cylinder-tumbler so that the key may be inserted through the sloto and engage
with lug integral with spindle E after passing the wards in the guard M and unlock
the door.
Having now particularly described and ascertained the nature of the said invention
as communicated to me by my foreign correspondent and in what manner the same is
to be performed I declare that what I claim is :-
1. The combination with a lock case and spring latch of ordinary construction of a
single spindle connecting the inner and outer door knobs which spindle is adapted to
be rigidly attached to the inner and outer knobs, as well as to permit the outer knob
to freely rotate axially without actuating the spindle substantially as specified.
2. The combination of door knob A rigidly secured to the squared end of the
spindle E and having a slot formed in the shank thereof together with pin B
recess c and slide D having lug 9 which is adapted to engage with the slot g¹ formed
in the shank O of outer door knob P and a corresponding slot in the cylindrical

page_text: portion of spindle E so as to lock the outer knob to the spindle E which actuates a
spring latch substantially as specified.
3. The combination of door knob A rigidly secured to the squared end of spindle E
and having slot & formed in its shank together with pin J in circular recess q pin B
recess c and slide D having lug g which is adapted by the action of the pin B to
become disengaged from the slot g¹ formed in the shank of outer door and a
corresponding slot of in the cylindrical portion h of spindle E so as to permit the
outer door knob P to rotate freely on the cylindrical portion h of spindle E which
actuates the latch without engaging with said spindle substantially as specified.
4. The combination with an outer door knob P of knob cylinder L slotted to
receive guard M with wards formed therein cylinder tumbler N slotted at o and
grooved to receive a key and slott lug journalled in recess at cylindrical end h of
spindle and circular aperture in upper half of outer knob to receive reduced end of
cylinder tumbler together with lug h' integral with spindle E against which lug the
key is adapted to engage after passing the wards in the guard M so as to rotate the
spindle and unlatch the door substantially as specified.
5. A cylinder tumbler grooved axially and with key hole formed therein to receive
a flat key and journalled in a recess formed in the cylindrical end of spindle and in a
circular aperture in the upper half of outer door knob so as to move freely in a
cylinder formed in lower half of outer knob slotted to receive a guard with wards
which the key is adapted to pass so as to engage with a lug integral with the spindle
and cause it to rotate axially so as to withdraw a lock from its haps when a lug
formed on a slide in spindle has been disengaged from a slot in shank of outer door
knob and a corresponding slot in cylindrical end of spindle substantially as
specified.
6. The combination of a spindle connecting inner and outer door knobs of a
recessed cylinder-tumbler adapted to receive a key and journalled to move in a
cylinder in outer knob, guard with wards, lug integral with spindle pin working in
circular groove in cylindrical end of spindle knob-rose slide with lug adapted to
engage with and to become disengaged from slot in shank of outer knob, and slot in
spindle when actuated by a pin passing through slide and adapted to rock in a recess
in spindle and inner door knob rigidly attached to squared end of spindle having
slotted shank for the pin which actuates the slide the whole being arranged and
operated to unlatch or unlock a door substantially as described.
7. The combination with knob cylinder L fixed in a slot in door and slotted to
receive guard M with wards formed therein of cylinder-tumbler N suitably
journalled to rotate in said cylinder and slotted at o and grooved to receive a flat key,
together with lug h' integral with spindle E against which lug the key is adapted to
engage after passing the wards in guards M substantially as described and for the
purpose specified.
h¹
Dated this. 2nd day of September 1887.