IMPROVEMENTS LOCKS AND LATCHES AND IN KEYS FOR LOCKS, AND IN ATTACHING DOOR AND OTHER KNOBS TO SPINDLES
Year: 1869

page_text: LETTERS PATENT to Peter Wilson, of Birmingham, in the County of
Warwick, Lock Maker, for the Invention of "IMPROVEMENTS
LOCKS AND LATCHES AND IN KEYS FOR LOCKS, AND IN ATTACHING DOOR AND
OTHER KNOBS TO SPINDLES."
Scaled the 6th May 1870, and dated the 11th November 1269.
PROVISIONAL SPECIFICATION left by the said Peter Wilson at the
Office of the Commissioners of Patents, with his l'etition, on the
11th November 1869.
I, PETER WILSON, of Birmingham, in the County of Warwick, Lock
Maker, do hereby declare the nature of the said Invention for "In.
PROVEMENTS IN LOCKS AND LATCHES AND IN KEYS FOR LOCKS, AND IN ATTACHING
DOOR AND OTHER KNOBS TO SPINDLES," to be as follows:-
My Invention consists, firstly, of the following improvements in
barrel locks and keys, that is to say, locks of a barrel form provided
with a series of radial slides or bolts. These radial slides or bolts are
usually pressed inwards to the centre of the barrel by separate metal
springs or by a single circular metal spring. According to my Invention

page_text: I make in the edge of the barrel a deep annular groove or channel in
which the outer ends of the slides or bolts are situate. Within this
groove I place a strong ring of vulcanized india-rubber, which ring of
india-rubber by bearing against a shoulder or shoulders on the slides
presses the whole of them inwards. By the use of a ring of vulcanized
india-rubber a more equal or uniform pressure is exerted on the whole
of the slides than when a metal spring is used, and the said india-rubber
ring lasts longer and is not liable to the injury by corrosion to which
metal springs are liable. I prefer to make the barrel thrower and drill
pin in one piece by the process of casting. I make the keys of the keys
it
of the said barrel locks as follows:-I cut in the key nine or other odd
number of radial slits or recesses to operate upon the slides or bolts of the
lock, and I provide a solid nib at the edge of the key, which nib takes into
a corresponding hole in the barrel. Or in place of making the nib solid
may be provided with a slit or recess to act upon one of the slides, a
solid part in this case being left at any desired part around the key in
place of one of the recesses so as always to leave nine or other odd number
of recesses or acting parts. By this means I can at pleasure reverse the
position of the acting parts of the key by changing the position of the
solid or non-acting part, and the manufacturer can by thus changing from
time to time the acting parts of the key and the slides of the lock produce
locks less liable to be picked than locks having keys in which the acting
parts are arranged in the usual manner.
My Invention consists, secondly, of the following improvements in
lever locks and keys for the said locks. Instead of making the bits of
the key act upon the lower edges of the series of the levers to raise them
preparatory to shooting or withdrawing the bolt I cut an opening at
about the middle of each of the levers, and leave curved or projecting
parts at the tops of the said openings in the levers for the key to act
upon. Within the openings described in the levers a tubular keyhole is
fixed, the levers working upon the said keyhole in their motion. The
upper part of the keyhole is cut away, and into the said cut away part
the curved projections described on the levers are pressed by springs
acting on the tails of the levers. The key for this lock consists of a
cylindrical stem, on the bottom of which a series of curved or excentric
parts or bits are made. The shapes and positions of these bits are such
that when the key is passed into the keyhole and turned the said bits
operate upon the said curved parts of the levers and raise the said levers

page_text: to the respective heights proper to permit of the bolt of the lock being shot
or withdrawn. The end of the key acts upon the bolt by bearing against a
projection made at the middle of the bolt. This construction of key may
also be used with barrel locks.
following mprovements in
bevilled, head of latch bolts
My Inventions consists, thirdly, of the
latches. One part consists in making the
reversable for the purpose of enabling the latches to be used either with
right-handed or left-handed doors. I make the bolt head separate from
the flat part of the bolt, and I provide the said separate head with a
stalk or rod. The outer end of the latch bolt is bent at right angles, and
against the outer face of the said bent end the separate bolt head bears.
The said separate head is connected to the bolt by the stalk or rod
described and a coiled spring. When the head is secured to the bolt the
said head may at pleasure be turned upon the bolt to reverse the bevil
of the said head. When the latch bolt is in its place in the lock or
latch case the opening in the case in which the bevilled head works
prevents the said head rotating on the bolt. Another part consists in
making the followers of latches of a heart shape, the said followers
being hollow or skeleton form. On the latch bolt and at right angles
thereto is an arm, on the end of which an antefriction roller is situated.
The said roller is placed and works within the heart-shaped follower,
and when the latch is in its shot position the said roller occupies the
narrow end of the heart-shaped follower. When the door knob is turned
in either direction one or other of the curved inner sides of the heart-
shaped follower bears against the antefriction roller on the arm of the
latch bolt and withdraws the said bolt. Another part consists of the
following improvements in the latch mechanism of double-handed locks
and latchs, that is, locks and latches in which two latch bolts are
Locks and latches
employed protruding from opposite sides of the case.
of this kind are applicable either to right or left handed doors without
changing the positions of the parts. In constructing these latches I
employ two cranked levers, the arms of which are nearly at right angles
to one another. The vertical arm of one lever is connected to one latch
bolt, and the vertical arm of the other lever is connected to the opposite
latch bolt. The horizontal arms of the levers are turned towards each
other, the end of one horizontal arm carrying an antefriction roller on
which the end of the other horizontal arm bears. These horizontal arms
are pressed down by a spring. Beneath and midway between the levers

page_text: is the horn-shaped follower. When the door knob is turned in either
direction the said follower raises both the horizontal arms of the levers,
and simultaneously withdraws the two latch bolts.
My Invention consists, fourthly, of the following improvements in
attaching door and other knobs to spindles. I make in one or both ends
of the spindle a longitudinal groove so as to form a fork at the end or
ends of the spindle. By introducing the forked end of the spindle into
the neck of the knob and passing a tapor or other screw through the
neck of the knob and between the fork the said fork is expanded into the
neck of the knob and the said knob thereby securely attached to the
spindle.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Peter Wilson in the Great Seal Patent Office on the 6th
May 1870.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, PETER
WILSON, of Birmingham, in the County of Warwick, Lock Maker, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eleventh day of November, in the
year of our Lord One thousand eight hundred and sixty-nine, in the
thirty-third year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Peter Wilson, Her special
licence that I, the said Peter Wilson, my executors, administrators,
and assigns, or such others as I, the said Peter Wilson, my executors,
administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
LOCKS AND LATCHES AND IN KEYS FOR LOCKS, AND IN ATTACHING DOOR AND OTHER
KNOBS TO SPINDLES," upon the condition (amongst others) that I, the
said Peter Wilson, my exectuors or administrators, by an instrument
in writing under my, or their, or one of their hands and seals, should
particularly describe and ascertain the nature of the said Invention,
and in what manner the same was to be performed, and cause the

page_text: same to be filed in the Great Seal Patent Office within six calendar
mouths next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Peter Wilson, do hereby declare
the nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say:-
My Invention consists, firstly, in the following improvements in barrel
locks and keys, that is to say, locks of a barrel form provided with a
series of radial slides or bolts. These radial slides or bolts are usually
pressed inwards to the centre of the barrel by separate metal springs or
by a single circular metal spring. According to my Invention I make
in the edge of the barrel a deep annular groove or channel in which the
outer ends of the slides or bolts are situated. Within this groove 1
place a strong ring of vulcanized india-rubber, which ring of india-
rubber by bearing against the ends of the slides or under a shoulder or
shoulders on the slides presses tho whole of them inwards. By the use
of a ring of vulcanized india-rubber a more equal or uniform pressuro
is exerted on the whole of the slides than when a metal spring is used,
and the said india-rubber ring lasts longer and is less liable to the injury
by corrosion to which metal springs are liable. I prefer to make the
barrel thrower and drill pin in one piece by the process of casting or
otherwise. I make the keys of the said barrel locks as follows:-I cut
in the key seven, nine, or other odd number of radial slits or recesses to
operate upon the slides or bolts of the lock, and I provide a solid nib at
the edge of the key, which nib takes into a corresponding hole in the
barrel. Or in place of making the nib solid it may be provided with
a slit or recess to act upon one of the slides, a solid part in this caso
being left at any desired part around the key in place of one of the
recesses so as always to leave seven, nine, or other odd number of
recesses or acting parts. By this means I can at pleasure reverse the
position of the acting parts of the key by changing the position of the
solid or non-acting part, and the manufacturer can by thus changing from
time to time the acting parts of the key and the slides of the lock produce
locks less liable to be picked than locks having keys in which the acting
parts are arranged in the usual manner.
Figure 1 represents in plan, Figure 2 in elevation, and Figure 3 in
vertical section a portion of a barrel lock containing my improvements.
a is the barrel, and b, b, are the radial slides or bolts of the lock. In

page_text: the edge of the barrel a is a deep annular groove or channel c, into
which the outer ends of the slides or bolts b, b, project. In this groove
or channel is a strong ring d of vulcanized india-rubber, the said ring
bearing against the outer ends of the said slides or bolts, and pressing
the whole of them inwards. Instead of making the ring d press against
the flat outer ends of the said slides-b, b, as represented in the Drawing,
a shoulder or shoulders may be made on the outer end of each slide by
cutting away a portion of the slide, under which the shoulder or shoulders
the ring d may bear. The barrel a, thrower a², and drill pin a³ are made
in one piece by the process of casting or otherwise, as represented in
the section Figure 3.
Keys for the barrel lock, Figures 1, 2, and 3, and for other barrel locks
arranged according to my Invention are represented in end elevation
in Figures 4 and 5. In the key represented in Figure 4 the solid nib
is marked e, and the radial notches or slits to operate upon the slides
or bolts of the lock are marked f. In the key represented in Figure 5
the nib part e is provided with a slit or notch f to act upon one of the
slides of the lock, and a solid or non-acting part g is made at the right-
hand side of the said slit or notch in the nib c. Or the solid or non-
acting part of the key may be placed at any desired part around the key
in place of one of the recesses f, the slides or bolts being arranged in a
corresponding manner. In this way there are always left nine or other
odd number of acting parts, the position of the solid or non-acting part
being varied at the pleasure of the manufacturer.
My Invention consists, secondly, of the following improvements in
lever locks and keys for the said locks. Instead of making the bits of
the key act upon the lower edges of the series of the levers to raise
them preparatory to shooting or withdrawing the bolt I cut an opening
at about the middle of each of the levers, and leave curved or projecting
parts at the 'tops of the said openings in the levers for the key to act
upon. Within the openings described in the levers a tubular keyhole
is fixed, the levers working upon the said keyhole in their motion.
The keyhole is cut away at one side, and into the cut away part the
curved projections on the levers are pressed by springs acting on the
tails of the levers. The key for this lock consists of a cylindrical stem, on
the lower part of which a series of curved or excentric parts or bits are
made. The shapes and positions of these bits are such that when the
key is passed into the keyhole and turned the said bits operate upon

page_text: the said curved parts of the levers and raise the said levers to the respective
heights proper to permit of the bolt of the lock being shot or withdrawn.
The end of the key acts upon the bolt by bearing against projections made
in the middle of the bolt. This construction of key may also be used with
barrel locks.
Figure 6 represents an elevation, and Figure 7 the same with the top
plate removed of a lever lock constructed according to this part of my
Invention. Figures 8 and 9 are longitudinal sections of the samo (the
levers being removed), Figure 8 showing the bolt shot, and Figure 9
the bolt withdrawn. Figure 10 represents the lock in cross section taken
through the dotted line A, A, Figure 7; Figures 11, 12, and 13 are parts
of the lock detached. Figure 14 represents in plan and edge view a slide
for carrying a saddle piece or covering plate for closing the keyhole of
the lock, and Figures 15 and 16 represent the keys of the lock and
slide. The same letters of reference indicate the same parts in Figures 6
to 16.
h is the bolt of the lock and i is the stump on the said bolt. The bolt h
is shown separately in Figure 12. are the levers of the lock turning on
the pin or centre and pressed down by springs 3. In each of the levers
k and at about the middle thereof an opening / is cut.
One of the said
levers is shown separately in Figure 11. At the tops of the openings in
the levers curved or projecting parts are left, against which the koy'
acts to raise the levers for shooting or withdrawing the bolt. Within the
openings in the several levers a tubular keyhole m is fixed. The
said keyhole is represented separately in vertical and horizontal section
in Figure 13. The said keyhole m is cut away at one side, and through
the cut away opening me thus made the curved or projecting parts / of
the levers are pressed by the springs 3 acting ou the tails of the lovers
as represented in Figure 7. n are the gatings in the levers in which
the stump i works. The key for raising the lovers k and operating the
bolt his represented in elevation and plan of under side in Figure 15..
The said key consists of a stem p, on the lower part of which is a series.
of curved or excentric bits q. The shape of these bits is best seen in
the plan Figure 15. The radius or excentricity of the bits q is different
at different parts of the stem for the purpose of raising the levers k to
the respective heights necessary. to permit of the shooting or withdrawing
of the bolt. The key acts upon the bolt h by means of one or other of
the wing-shaped parts engaging with one or other of the teeth or

page_text: recesses in the bolt (seo Figure 12).. The bolt his shot or withdrawn
by, introducing the key, Figure 15 into the keyhole m, and turning the
key until the levers / are raised by the bits q to the respective heights
proper to permit the stump i to pass into or out of the gatings n of the
levers, as is well understood. I prefer to combine with this lock mechan-
ism for closing the keyhole m after the bolt has been shot, that is to
say, I make a second opening s in each of the levers k, and piace a second
keyhole in the several openings in the levers. The openings 8, key-
hole and projections on the levers for the key to act upon are
similar in construction to those herein-before described. Under the
levers is a slide u (shown separately in Figure 14), having a stump v
which works in the gatings win the levers k. The said slide u carries
a saddle piece or covering plate connected thereto by the vertical
arms y, y. By means of this saddle piece the keyhole m when the
bolt has been shot can be closed, and access to the keyhole for picking
the lock or for other purpose is thereby prevented. The key for shooting
or withdrawing the saddle piece or covering plate x is represented in
Figure 16. The said key is constructed similarly to the key, Figure 15,
but the bits are differently arranged on the stem from the bits of the
key Figure 15 and the radial projections are made to act upon or engage
with the teeth 2 of the slide u (see Figure 14) to shoot or withdraw the
said slide. After the bolt h has been shot the key Figure 16 is introduced
into the keyhole t and turned, the levers are thereby raised so as to permit
of the stump passing out of the gatings w. By then shooting the
slide u by the action of the projections of the key the saddle piece or
covering plate passes from the position represented in Figures 7 and 9
to that represented in Figure 8, and indicated in dotted lines in Figure C,
and covers the keyhole m and prevents access thereto. On raising the
levers preparatory to shooting or withdrawing the bolt by the key
Figüre 15 the length of the gatings w permits the levers to work upon the
stump, the ends of the levers passing under the forked part of the stump.
To withdraw the bolt h the saddle piece or covering plate is first
withdrawn from the keyhole by the action of the key Figure 16 before the
key Figure 15 can be used. The lock represented may be used
without the saddle piece or covering plate x and parts connected
therewith.
C
The improvements described and represented are applicable to padlocks

page_text: My Invention consists, thirdly, of the following improvements in
latches: One part consists in making the bevilled head of latch bolts
reversible for the purpose of enabling the latches to be used either with
right-handed or left-handed doors. I make the bolt head separate from
the flat part of the bolt and I provide the said separate head with a
stalk or rod. The outer end of the latch bolt is bent at right angles, and
against the outer face of the said bent part the separate bolt head bears.
The said separate head is connected to the bolt by the stalk or rod
described and a coiled spring. When the head is secured to the bolt
the said head may at pleasure be turned upon the bolt to reverse the
bevil of the said head. When the latch bolt is in its place in the lock
or latch the bevilled head is prevented from rotating on the bolt. This
part of my Invention is represented in connection with the combined
lock and latch shown in elevation in Figure 17 of the Drawing, and
detached in Figures 18 and 19. a is the separate latch bolt head, and a²,
is the stalk or rod of the same. The separate bolt head is shown
detached in Figure 19. b is the flat latch bolt, the outer end b³ of
which is turned at right angles and forms a shoulder against which the
inner face of the bevilled head a bears. The stalk or rod of the bolt
head passes through a hole in the bent part 63 of the latch bolt, and is
capable of sliding in the said hole. The separate head a is connected to
the bent end 6 of the latch bolt b, by the coiled spring c situated around
the inner end of the stalk a³, one end of the spring bearing against the
part 2 of the latch bolt, and the other end bearing against a cross pin on
the stalk a2. On the inner face of the separate head is a squaro or
angular projection a³ which takes into a corresponding shaped recess 63
in the outer face of the bolt 6, so that when the parts a and b are engaged
together they are incapable of turning upon one another. The opening
in the plate d of the case in which the bevilled head works also prevents
When it is wished to reverse the
the head a turning on the latch bolt.
bevil of the bolt head a the said head a is pulled outwards so as to
remove it from the plate d of the lock case, the coiled spring cis thereby
compressed as illustrated in Figure 18. By now rotating the bolt head a
its bevil is reversed, and on bringing the said head opposite the hole in
the plate d, the said head is forced into its place in the plate d
and its inner face made to engage with the end 63 of the latch
bolt b the action of the spring c. The reversal of the bovil of
the latch bolt is by this arrangement effected without the necessity for

page_text: removing the top plate of the lock or latch, or for disengaging the latch
bolt from the latch mechanism by which the latcli is worked.
12
.
Another part of my Invention consists in making the followers of
latches of a heart shape, the said followers being hollow or skeleton form.
On the latch bolt and at right angles thereto is an arm, on the end of
which an antifriction roller is situated. The said roller is placed and
works within the heart-shaped follower, and when the latch is in its shot
position tho said roller occupies the narrow end of the heart-shaped
follower. When the door knob is turned in either direction one or other
of the curved inner sides of the heart-shaped follower bears against the
antifriction roller on the arm of the latch bolt and withdraws the said
bolt. This part of my Invention is represented in Figures 17, 18, and 19
of the Drawings. e is the hollow-shaped follower carried by the
square axis f, through which the spindle of the door knob passes. The
said follower is represented separately in Figure 20. g is an arm on the
bolt 6 of the latch, near the end of which arm an antifriction roller is
situated. The said roller h works within the heart-shaped follower; a's
seen in Figure 17. When the latch bolt b is in its shot or normal
position the roller h occupies the narrow end of the heart-shaped follower.
On turning the door knob in one or other direction one or other of the
curved inner sides of the heart-shaped follower e bears against the
roller hand withdraws the latch bolt b. Ou loosing the knob the latch
bolt bis shot forward by its spring i and the roller resumes the position
represented in Figure 17.
Another part of my Invention consists of the following improvements
in the latch mechanism of double-handed locks and latches, that is, locks
and latches in which two latch bolts are employed protruding from
opposite sides of the case. Locks and latches of this kind are applicable
either to right or left-handed doors without changing the positions of
the parts. This part of my Invention is represented in Figure 21 of the
Drawings. In constructing latch mechanism according to my Invention
I employ two cranked levers k, l, turning on the centres k², 13.
arms of each of the said levers are nearly at right angles to one another.
The vertical arm of the lever / is connected to the latch bolt m, and the
vertical arm of the other lever is connected to the opposite latch bolt n.
The horizontal arms of the levers k, l, are turned towards each other,
the end of the horizontal arm of the lever k carrying an antifriction
The

page_text: roller pon which the end of the horizontal arm of the lever bears. The
horizontal arms of the levers k, l, are pressed down by a spring q. Beneath
and midway between the levers k, l, is the horu-shaped follower r. When
the door knob is turned in either direction, tho said follower raises both
the horizontal arms of the levers k, l, and simultaneously withdraws the
two latch bolts m, n. The return motion of the latch bolts is effected
through the spring g
My Invention consists, fourthly, of the following improvements in
attaching door and other knobs to spindles. I make in one or both ends
of the spindle a longitudinal groove so as to form a fork at the end or ends
of the spindle. By introducing the forked end of the spindle into the
neck of the knob and passing a taper or other screw through the neck of
the knob and between the fork, the said fork is expanded into the neck of
the knob, and the said knob is thereby securely attached to the spindle.
This part of my Invention is illustrated in longitudinal section in Figure
22, and cross section in Figure 23. The spindle is shown separately in
Figure 24. a is the spindle, the end a² of which is forked. On one of
the outer faces of the said forked end a³ of the spindle, a series of teeth
or notches c is made, and in the interior of the neck of the knob e an
inclined projection or shoulder d is made with which projection or
shoulder one or other of the notches c can be made to engage as herein-
after described and thereby fix the knob on the spindle. In attaching the
knob c to the forked end a² of the spindle a the said forked end is intro-
duced into the neck of the knob in such a position that the notched side c
of the spindle is opposed to the projection d on the neck. Having adjusted
the spindle in the neck of the knob so that the required notch at c is
brought opposite the projection a taper or other screw fis passed through
the neck of the knob and between the fork a². By means of the said
screw f the forked end a² of the spindle is expanded into the neck of the
knob so as to engage one of the notches at c with the inclined shoulder or
projection d in the neck of the knob. The knob is thereby securely fixed
on the spindle as represented in Figure 22. To remove the knob from
the spindle the screw f is withdrawn, when the shoulder d is liberated
from the notched side of the spindle and the latter may be removed
from the knob.
Having now described the nature of my Invention, and the manner in
which the same is to be performed, I wish it to be understood that I do
not limit myself to the precise details herein described and illustrated, as

page_text: the same may be varied without departing from the nature of my Inven-
tion; but I claim as my Invention,-
Firstly. The improvements in barrel locks herein-before described and
illustrated in Figures 1, 2, and 3 of the accompanying Drawings, that is
to say, pressing inwards the whole of the radial bolts or slides of the said
locks by means of a ring of vulcanized india-rubber placed in a deep groove
or channel in the edge of the barrel and pressing against the outer ends of
the said bolts or slides, substantially as described and illustrated. Also
making the barrel thrower and drill pin of barrel locks in one piece, sub-
stantially as described and illustrated.
Secondly. The improvement in the keys of barrel locks hercin-before
described and illustrated in Figures 4 and 5 of the accompanying Drawings,
that is to say, arranging the acting and non-acting parts of the said keys
substantially as described and illustrated, whereby the acting parts of the
key may be reversed at pleasure by changing the position of the solid or
non-acting part.
Thirdly. The improvements in lever locks herein-before described aud
illustrated in Figures 6 to 16 both inclusive of the accompanying Drawings,
that is to say, inaking openings at about the middle of the levers and
leaving curved or projecting parts at the tops of the said openings for the
key to act upon, the curved or projecting parts of the levers being pressed
through an opening in the tubular keyhole, into which keyhole the key is
inserted to shoot or withdraw the bolt of the lock substantially as described
and illustrated. Also combining with the said locks a sliding saddle piece
or covering plate operated by an independent key for covering or closing
the keyhole of the lock when the bolt has been shot, substantially as
described and illustrated.
Fourthly. The improvements in keys for lever locks and barrel locks
herein-before described and illustrated in Figures 15 and 16 of the
accompanying Drawings, that is to say, making the parts of the key for
operating upon the levers or slides of the lock of a series of curved or
excentric bits, so arranged on the stem of the key as to raise the levers
to the required heights, or press outwards the slides to the required
distances preparatory to shooting or withdrawing the bolt, as described
and illustrated.
Fifthly. The improvements herein-before described and illustrated in
Figures 17, 18, and 19 of the accompanying Drawings for reversing the
bevilled ends of latch bolts to cuable the latches to be used either with

page_text: right-handed or left-handed doors, that is to say, making the head of the
latch bolt separate from the body of the bolt, and so connecting the sepa-
rate head with the body of the bolt that the said head can be turned from
the outside of the lock or latch case to reverse its bevil, substantially as
described and illustrated.
Sixthly. The improvements in the mechanism of latches herein-before
described and illustrated in Figures 17, 18, and 20 of the accompanying
Drawings, that is to say, making the followers of latches of a hollow
heart-shaped figure, and causing a roller on an arm of the latch bolt to
work within the heart-shaped follower, substantially as described and
illustrated.
Seventhly. The combination of the parts of the latch mechanism of
double-handed latches or locks and latches herein-before described and
illustrated in Figure 21 of the accompanying Drawings.
Lastly. The combination of parts herein-before described and illustrated
in Figures 22, 23, and 24 of the accompanying Drawings for attaching
door and other knobs to spindles.
In witness whereof, I, the said Peter Wilson, have hereunto set my
hand and seal, this Fourth day of May, in the year of our Lord One
thousand eight hundred and seventy.
Witness,
RICHARD SKERRETT,
Clerk to George Shaw,
Birmingham.
PETER WILSON. (L.S.)