Improvements in Cylinder Locks.
Year: 1897

page_text: Date of Application, 20th Nov., 1897-Accepted, 19th Nov., 1898
Improvements in Cylinder Locks.
I, EMERICH DE MARSOVSZKY, of No. 58, Arénaut, Budapesth VII., in the Kingdom
of Hungary, Empire of Austria, Engineer, do hereby declare the nature of my said
invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement :-
The present invention relates to locks, particularly that class of locks which are
applied to doors, cash boxes, furniture and railway carriages and closed trucks.
The invention consists of a lock comprising a series of superposed cylinders and
tumblers in connection therewith, and a key having a separable or divided bit, the
parts of said bit being separated after the key has been inserted in the lock and each
part acting to operate one cylinder, the said bit-sections being again locked together
as the key is withdrawn.
The construction of the key hit is such that neither the locking mechanism nor
its constituent parts nor the nature of the mechanism in the lock for locking
and unlocking the said parts are visible externally, nor can the bit-sections be
separated without the co-operation of the lock cylinders, as will be hereinafter
particularly described.
In order to render the present specification easily intelligible, reference is had to
the accompanying drawings, in which similar letters of reference denote similar
parts throughout the several views :-
Fig. 1-13 represent the construction of the key,
Fig. 1 being a side elevation of the key, .
Fig. 2 a similar elevation seen from the opposite side,
Fig. 3 an end elevation,
Fig. 4 a view seen from underneath,
Fig. 5 a vertical section through the composite bit,
Fig. 6a central cross section in a vertical plane through the said bit,
:
Fig. 7 a side elevation of the bit with the lower section detached and swung
round on the key shaft,
Fig. 8 a similar elevation with all the sections detached and swung round as also
slid longitudinally along the key shaft,
Fig. 9 a plan of Fig. 8,
Fig. 10 a horizontal section through the middle bit-section,
Fig. 11 a view of the middle key or bit section seen from the upper side,
Fig. 12 a similar view of the same section seen from underneath, and
Fig. 13 a horizontal section through the lower bit-section.
Figs. 14 to 19 show the general construction of the lock,
Fig. 14 being a plan of the lock,
Fig. 15 a side elevation of the same,
Fig. 16 a vertical section on line 16-16 of Figure 14,
Fig. 17 a similar section on line 17-17 of Fig. 14,
Fig. 18 a similar section on line 18-18 of Figure 14 and
Fig. 19 a similar section on line 19-19 of Figure 14,
Price 8d1

page_text: Figs. 20 to 34 show in various elevations and sections the construction of the
various cylinders, in the present case three are shown but the number may be varied
as also the number of the bit sections.
Fig. 20 is a plan of the top or front cylinder,
Fig. 21 a side elevation of the same,
Fig. 22 a view of the same cylinder seen from underneath,
Fig. 23 a plan of the middle cylinder,
Fig. 24 a cross section of the same on line 24-24 of Fig. 23,
Fig. 25 a similar section on line 25-25 of Fig. 23,
Fig. 26 a similar section on line 26-26 of Fig. 23,
Fig. 27 a view of the same cylinder seen from underneath,
Fig. 28 a plan of the lower cylinder carrying the bolt,
Fig. 29 a cross section of the same on line 29-29 of Fig. 28,
Fig. 30 a similar section on line 30-30, Fig. 28,
Fig. 31 a plan of the base plate of the lock,
Fig. 32 a cross section on line 32-32, Fig. 31,
Fig. 33 a side elevation of the said plate, and
Fig. 34 a view of the same, seen from underneath.
Figures 35 to 42 are a series of plans and vertical sections, showing the position of
the parts of the lock when the key is placed therein at various points in the passage
perforined by the key to open the lock.
Fig. 35 is a plan showing the key in the position it has attained after having been
turned from the key-hole to L2 (Fig. 39) and from 1 to K; at a point intermediate
of the two latter points the lower key-bit-section has been detached whilst the
middle and upper sections are still connected and lie in the line K-L of Figure 35,
Fig. 36 is a vertical section on line 36-36 of Figure 35,
Fig. 37 is a plan showing the position of the key after the saine has been turned
to the point K at which the latch retaining the middle and upper sections has been
thrown back and the locking piu for the two sections disengaged, so that these two
sections have now also been separated, and the second cylinder may be operated.
Fig. 38 is a vertical section on line 38-38 of Figure 37.
Fig. 39 is a plan showing the passage of the upper bit-section from the point K¹
of Figure 37 to the point K2 of Figure 39, the latch being thrown back and its
fingers operating to throw out of engagement the tumblers of the middle cylinder.
Fig. 40 is a vertical section on line 40-40 of Figure 39.
Fig. 41 is a plan showing the upper bit-section on the line L³ K³ or in the position
to open the lock, aud
Fig. 42 is a vertical section on line 42-42 of Figure 41.
In the drawings I have illustrated a form of my invention, involving a key having
a bit composed of three sections, but the invention is not confined to the particular
number of bit-sections and cylinders, as these may be increased or decreased by
means of simple mechanical contrivances patent to anyone skilled in the art.
The lock illustrated comprises the following main points:―
1/ A key having a bit comprising three sections.
2/ The latch in connection with a middle section.
3/ A lock having a bolt operating cylinder and bit operating cylinders.
4/ Means for closing the keyhole.
1. THE CONSTRUCTION OF THE KEY.
The shaft is provided with a suitable handle and with an upper bit section ¹
rigidly attached thereto, a middle section 2 pivotally mounted on a reduced diameter
at the forward end of said shaft, and a lower or forward bit 3, also mounted on said
shaft, the latter two bit sections being capable of longitudinal movement on said shaft
and being prevented from detachment from same by means of a head formed at the
end of the said shaft. The lower surface of the upper bit section is provided with
a series of borings varying in depth (Figs. 5 & 6) said borings corresponding in
depth and diameter to a series of pins q (Fig. 29) mounted in the bolt cylinder d and
The shaft is provided with a suitable handle and with an upper bit section /¹
rigidly attached thereto, a middle section 2 pivotally mounted on a reduced diameter
at the forward end of said shaft, and a lower or forward bit ³, also mounted on said
shaft, the latter two bit sections being capable of longitudinal movement on said shaft
and being prevented from detachment from same by means of a head + formed at the
end of the said shaft. The lower surface of the upper bit section is provided with
a series of borings varying in depth (Figs. 5 & 6) said borings corresponding in
depth and diameter to a series of pins 7 (Fig. 29) mounted in the bolt cylinder d and

page_text: capable of depressing a series of spring pressed bolts r having springs (Figs. 18
& 19) and thus releasing the said bolt cylinder as hereinafter set forth. The shape
and depth of the borings z (Fig. 5) are concealed from view in the key by means of
the intermediate bit section 2 which is pivotally mounted on the reduced part of the
shaft of the key. A third section 3 is mounted on the said shaft below the said
second section. A detent bolt 3 is mounted in the outer end or the intermediate
section, said bolt being normally depressed by means of a spring 12 and being
retained in the end boring z of the section by the upper surface of the under
section 3, when the key is not in the lock. As soon as the under section 3 has been
separated from the middle section by the action of the lock cylinder, the bolt³
will be depressed by the spring 12 as hereinafter described, after the said key shall
have been turned a certain part of the revolution. The spring bolt 3 is concealed by
the section k³ when the key is not in the lock. The section 3 is coupled to the
section by means of a series of spring bolts 1, which engage in a corresponding
series of vertical borings of the said lower bit section depressing a corresponding
series of bolts q₁ of varying length, the reduced ends of which bolts q¹ are visible
through openings in the under surface of the said lower bit section. The bolts 71
are normally depressed by means of springs m mounted above the same in the middle
section but if they are by any means pressed upwardly so as to cause their ends to
be in alignment with the line of section between bit-sections 2, 3, the latter will be
released from the former.
When this has taken place and provided that no means are present to retain the
spring bolt in its upward position, the latter would be normally depressed and
accordingly disengage the upper fixed bit-section from the said middle section.
If now the key shaft and with it the upper section are turned far enough to bring
the latter out of engagement with the section 2 this, and with it the lower section ¹
may be slid along the key shaft k into planes approximate to that of the fixed bit h³,
this being in fact, the position of the bit sections when operating to open the lock
(Figures 8 & 9).
In order to effectually close the crevices between the bit-sections, the lower edge
of sections 1, 2, are provided with chamfers b1, b2 respectively (Figs. 6, 7 and 8),
which engage corresponding recesses g¹, g2 of sections ³, 12, Figs. 9 & 11.
The ledges 61, 62 and their engaging recesses g³, are cut in the respective parts,
so as to permit the same to separate in the required direction, but the said
ledges will prevent the sections of the bit from opening in the opposite direction
as will be clearly seen from Fig. 6.
2. THE LATCH ON SECTION 2.
The latch is pivoted on a bar a² mounted on lugs a¹, x² of the middle bit
section and its lower end is concealed in a small housing y fast on the lower bit
section 3, said housing serving mainly to conceal a series of hooked fingers ³ at the
lower end of the said latch, and for disengaging said fingers from a series of tumblers
When the housing y
or sliding bolts as hereinafter described, Figs. 6, 11 and 12.
is in position over the ends of the fingers ³, a ledge 5 (Fig. 7) of said housing
engages in the hook-shaped recess (Fig. 8) of the fingers and conceals their form.
A pin (or pins) p (Fig. 8) engages the corresponding recess in the section ¹ to
guide the same into proper position against the middle section 2. By means of the
pins q and the latch the connections between the bit sections are so concealed and
the latter so coupled that it is impossible to separate the parts even when the
section and the head of the reduced part of the shaft & may have been detached
by means of a chisel or other tool.
3. THE LOCK WITH BOLT AND BIT OPERATING CYLINDERS.

page_text: cylinders b, c and d. The cover a is screwed to the cylinder a¹, at y¹ and is
provided with the key-hole 1, 1; in the housing a, a¹ are mounted the superposed
cylinders b, c & d. As will be seen from the drawings described in connection
with the key, the bit sections k¹, k², k³ are connected to the key shaft by means of
curved or bow-like arms corresponding in shape to that part of the key-orifice
which connects the key shaft opening with the lower part 1, of the orifice, so that
in all the cylinders the nose u (Figs. 20-27) will extend into the key hole and
prevent an examination of the interior of the lock through the hole 1. The
head and the shaft of the key k will be inserted into hole l, whilst the bit
comprising the three sections k¹, 2, 3 will enter the extension of the key hole.
In the immediate proximity of the orifice a cavity s, t, is formed on the under
surface of the cylinder b (Figs. 16-22, 36, 38, 40 and 42) the cross section of
said cavity corresponding to the shape of the latch so that the latter can pass
into the cavity when the bit has been sufficiently far inserted into the lock. As
the cavity extends radially, it is reduced in section to form the parts and, as
soon as latch meets the flattened part of the cavity, the latch will be turned
on its pivot a². The lower surface of the cylinder b is further provided with a
depression having various sectional areas 0, 1, 2, in which the tumblers v of the
cylinder c may move. The intermediate cylinder c (Figs. 16 to 19 and 23 to 27)
is provided at its under surface with a recess. 03, for the reception of the housing y
on the bit-section 3. The key hole in the cylinder c (Figs. 23 and 27) is extended
or widened and the ends of the tumbers v extend into the widened part of the same.
These tumblers are operated by the fingers 3 of the latch x and forced backwards
when the latter is turned on its pivot a². The hooks v1, v2 of the sliding tumblers v
engage successively in the groove w, wel, w² of the cylinder b, which groove, as above
mentioned, is provided with varying cross-sections, so that each part of the said
groove will correspond to certain positions of the tumblers v. The movement of the
looks v¹, v² from one section of the groove to another is facilitated by means of
springs a (Fig. 25), which normally force the tumblers v into the opening .
The cylinder c is further provided with an orifice for the admission of the
section of the key and with an inclined groove el, which correspond to the width
of the bit-section and is gradually flattened. On the lower surface of the said
cylinder ca guide pin c¹ (Fig. 19) is mounted which engages in a groove
provided in the bolt-cylinder d.
The bolt-cylinder & having bolt hook or catch g Figs. 16-19 and 28 to 30, is
provided with the key-orifice-extension . Instead of the part of the key hole
a deep groove n¹, corresponding to the shape of the bit-section 3 is provided, said
groove containing a series of pins n, adapted, on contact with the pins q¹ to press
the latter upwardly into the bit-section. Another groove 23 similarly inclined to
the groove e¹ in the cylinder c, and becoining gradually flattened, is provided in the
cylinder (Fig. 28) said groove being recessed at t' in order to guide the spring pressed
pin 3. The cylinder dis further provided with a series of bolts, by means of which
it is locked to the base plate e. The detent-bolts proper, r, which are operated by
the said bolts q, are mounted in the base-plate e and extend into borings of the bolt
cylinder d, in which the said bolts q are mounted. The bolts q correspond in
position to the borings of the bit-section ¹, and their ends extend into a cavity p
formed in the upper surface of the said cylinder d. The cylinder d is locked as
before mentioned to the base plate e, Figs. 16-19 & 31-34. The projections or
lugs of the base plate fit into corresponding recesses (Fig. 36) of the cylinder a
and the said base plate may be further secured to the cylinder walls of the housing
by means of plugs, inserted into recesses j¹ in the lugs and in the sides of the base
plate e through orifices ; in the cylinder a¹.
The base plate e forms the closure for the part of the key hole, being provided
with a depression only deep enough to receive the head of the key shaft. The
series of bolts (Fig. 32) mounted in this plate and which, as previously mentioned,
serve to lock the bolt cylinder d are normally pressed upwardly by means of

page_text: springs, mounted on a spindle, fitted in a recess in the under surface of the said
base plate, Fig. 31.
When the lock is locked, the cylinders b, c, d and the base plate e are in the
following positions:-
The detent bolts
of the base plate e are in engagement with the bolt
At the same time the sliding
cylinder and prevent the same from rotation.
bolts q cf the bolt cylinder are covered and effectually concealed by the cylinder c.
recess p
The orifice m¹ of the cylinder c is now in position above the
of the cylinder d. The tumblers v, are in position in the opening
on the cylinder c and prevent the movement of the hooks ¹, in the
groove w, w¹, w². The orifice m¹ may be brought into position above the recess pl
by turning the cylinders c and b, but the said opening will still be concealed by
the cylinder b. Not until the latch has disengaged the tumblers v, can the
bit-section by rotating the cylinders b and c be passed from the orifice m¹ to
the recess p¹.
In locking the lock the latter and the key co-operate in the following manner:-
The key is passed into the orifices, of the cylinders b and c, far enough to
allow the whole composite bit to reach the cylinder d. If, now, both the cylinders
are turned, the bit 1, 2, 3 will be turned to the position indicated by the line 30-30
of Fig. 28. At this point, the lowest bit-section ³ will enter the recess n¹ of the
cylinder d and the pins n in the recess will engage the ends of the bolts q¹ of the
key, pressing the same upwardly, and thus raising the bolts sufficiently high in
the section to detach the latter from the lower section. The middle section 2
is however, still coupled by means of the latch and the spring bolt 3 to the upper
If now the
section, whilst the lower section will remain fixed in the recess n³.
When the
the key is turned further, the cylinders b and c will rotate with the same.
sections 1, 2 have been turned to the position indicated by the line K-L, Fig. 35,
the latch comes into operation. The position just described is illustrated in
Figs. 37 and 38 in plan and section. In these views, the cylinders b and c are in the
same position one above the other as in Fig. 35 along the line K-L. The bit-
sections, are still coupled owing to the fact that the spring bolt 3 has not yet
reached the deepest point of the inclined groove t¹. A moment afterwards, the said
bolt 3 will be enabled, by means of the groove, to move downwards far enough, to
pass out of the section, and at this point the intermediate cylinder c will remain
stationary, since the pin c¹ has attained the end of the concentric groove o in the
The bit-section is now uncoupled
upper surface of the cylinder d, Figs. 28 & 29.
from the section 2, and on continuing to turn the key the former section k¹ alone
will effect the further rotation of the cylinder b, as long as the hooks v1, v2 remain in
The tumblers v can only
the section H, H¹ (Fig. 35, 39) of the groove w, w¹, w².
be operated by the latch and as long as this latch is in the enlarged part of the
groove 8, (Fig. 37, 38) the same will be in a substantially vertical position and will
not influence the said tumblers when the bit-section has reached the position
indicated by the line L¹ K¹ of Fig. 37, the groove t will have been turned far enough
to the right to cause its decreased section to operate the latch r, tipping the same on
its pivot by means of the edge t². The further rotation of the key operates the
fingers against the ends of the tumblers v causing the hooks vt v2 of the same to
be forced outwardly, so that the same may now pass into the section H'--H² of the
groove w¹ of the cylinder b, along which groove they will now pass. They must
not, however enter the groove w¹ before the key hole of the cylinder b has passed off
that of the cylinder c entirely, see the position indicated by line K-L of Fig. 37.
If the section ¹ is further turned from the position indicated by line 12-K,
Fig. 39, the cylinder b will move with it, because the hooks v³, v² can now move in
the part 2 of the groove w, w¹, w². The orifice m¹ of the cylinder e will now cover
the recess p¹ of the bolt cylinder d. When the bit-section has arrived at the
position indicated by the line K³-L³ of Figure 41, the said section may be pushed
through the orifice m¹ into the recess p¹. When this is the case, the bolts q enter
the holes z on the lower surface of the bit section and will be depressed so that the

page_text: detent bolts in the base plate e will also be depressed and pass out of the borings
of the bolt cylinder d, which latter will then be free to rotate. The three bit
sections 1, 2, 3 will now be in the position indicated at Figs. 8 and 9, and the bolt
cylinder d may be turned either by means of the key or by means of the bolt y, thus
disengaging the latter and enabling the door to be opened.
It should be remarked that the section 3 is retained in the cylinder d, and the
section in the cylinder c. The grooves 3 and t¹ serve to guide the detent bolts
and the spring bolt 3 respectively. The groove e¹ forms the guide for the bit-
section k¹.
In turning the key back, the bit section is first withdrawn from the orifice m¹
and recess and then turned backwards in the recess or depression e¹ (Fig. 23).
The section will then re-couple with the section 2 and at the same time or imme-
diately afterwards the latch will begin to move into its vertical position. On
continuing to turn the key back, the sections 1, 2 will move together. The inclined
groove will press the spring bolt 3 back into the section k¹ and at the same time,
the spring bolts 2 will be pushed home in the section by the inclined groove ³, so
that the lower section 3 will be able to be turned into position against the
section k².
If the cylinder d has not been turned back far enough to allow the detent bolts r
and the bolts to come into alignment, the key may be withdrawn from the lock
without locking the door, the lock will not be closed until the bolts have been
brought into alignment with the bolts 7 either by turning the bolt cylinder d by
means of the key or by means of the bolt g.
4: The device for covering the key hole is illustrated in Figures 14 to 19 and
consists of a cover F, having a handle F1 and having arms B (Figs. 14 to 19) pivotally
attached to hinge-pin C, which is mounted in a block A of the lock cover or cap a.
The said cover is provided with downwardly extending ledges P between which a
chise F3 of rubber or other yielding material is secured, said disc serving to tightly
close the key-hole. The cover F is retained in position by means of a lever G,
pivoted at G2 (Fig. 14) and adapted to engage under a hook G¹ on the lock
cover.
In order to prevent the cover F from being opened by unauthorised persons, a
strip of paper, linen, leather or the like may be stretched over the same.
The strip
is attached to hook E (Fig. 18) drawn over the cover and over an orifice in the same,
in which the bolt D fits. After the lock has been closed, the pin D may be passed
through the strip into its orifice, when a laterally sliding spring pressed
bolt with spring 62 will advance into a recess D¹ of the said pin D retaining same
in position. On opening the lock when the cylinder d is turned, the bolt o will be
turned out of the recess of the pin D and the latter will be raised by means of a
screw like rib m² formed around the cylinder b. The bolt cylinder may be arranged
in any desired manner.
The lock may be attached to the car or truck or door frame etc., in any suitable
way, for instance by means of bolts i, attached to the cap a, and which may be
passed through the wall of the car, these bolts may be secured on the interior of the
car by means of a ring and nuts i¹.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1. In a lock, the combination of a key, having separable bit consisting of a series
of sections, means for locking said sections together, a series of superposed cylinders
in said lock and means in connection with the same for disengaging the bit-
sections when the lock is opened and re-locking the same when the lock is closed,
door fastening means, being attached to one of said lock-cylinders, substantially as
described.
2. In a lock, the combination of a cylindrical housing, having a base plate and
having therein a series of superposed cylinders and a bolt fast on one of said cylinders,

page_text: a key having a composite bit, one section of which is fast to the key shaft and bit
sections, pivotally mounted on said key shaft, means concealed within said bit for lock-
ing the sections together, and means in connection with lock cylinders for unlocking
said bit-sections and for releasing the bolt-cylinder after said sections have been
disengaged and for relocking said sections before the key has left the lock, substan-
tially as described.
3. In a lock, the combination of a cylindrical housing, having a base plate, a bolt
cylinder mounted on said base-plate and superposed bit-operating cylinders, revolubly
mounted in said casing, a key having separable bit comprising a fixed section fast
on the key shaft and other sections pivotally attached thereto and longitudinally
moveable thereon, means for locking said section together and means in connection
with the lock cylinder for unlocking said sections and for moving same, with the
exception of the fixed section, longitudinally on the shaft when the key is forced into
the lockhousing and turned therein and means in connection with the base plate of
the lock for releasing the bolt cylinder when the key has been turned home and
ineans for relocking the bit sections together when the key has been withdrawn from
the lock, substantially as described.
4. The combination of a lock, having cylindrical housing and base-plate fixed
therein, a bolt cylinder and superposed lock-cylinders revolubly mounted on said base
plate, and means for locking said bolt cylinder to said base plate, a key having
separable bit one section of which is fast on said key shaft and two sections of which
are revolubly mounted thereon, a latch pivotally mounted in the middle bit section,
and having formed at its end a series of fingers, a housing on the lower section to
conceal said fingers and means for locking said three sections together, a series of
sliding tumblers mounted in the lower locking cylinder, and means in connection
with the upper locking cylinder for tripping said latch, means in connection with the
bolt cylinder for disengaging the lower hit-section and operating the fingers of the
same against said tumblers to permit movement of said upper cylinder on said lower
cylinder, an orifice in said lower cylinder for the passage therethrough of the fixed
key-bit, means for locking the fixed section of the bit and the revoluble section there-
under, a series of bolts mounted in the base plate and springs to press same upwardly,
a series of sliding bolts to operate said detent bolts and a series of depressions in the
underside of the said fixed section, to engage said sliding bolts and depress same,
when the key has been forced into the lock and the bit sections of the same have
been detached and means for re-locking the bit-sections when the key is withdrawn
from the lock, substantially as described.
5. The combination of a cylindrical lock-casing having a base plate and a bolt
cylinder and superposed lock-cylinders mounted therein, a series of bolts spring
mounted in said base-plate to engage said bolt-cylinder, a key having a separable
bit-comprising three sections, one of which is fixed to the key shaft and two of
which are revoluble and longitudinally moveable thereon, means in connection with
said fixed bit to depress the detent-bolts of the base plate, a series of sliding bolts
mounted in the lower section of said bit, a series of spring-pressed bolts mounted in
the intermediate section, and a spring-pressed bolt to connect said upper and inter-
mediate sections when the three sections are interlocked, a series of sliding tumblers
mounted in the intermediate lock cylinder and adapted to couple same to the upper
look-cylinder, a latch pivoted to the intermediate key section and having fingers to
operate said tumblers, means in connection with the upper lock-cylinder to trip said
latch, means in connection with the bolt cylinder to unlock the lower bit-section,
and means in connection therewith to release the lock bolt between the upper and
intermediate bit-sections after said latch has been tripped, and means for re-locking
the key before the same is withdrawn from the lock substantially as described.
6. The combination of a lock having a bolt-cylinder and superposed lock-cylinders
and a key having separable bit as specified and means in connection with said lock
5 and key-bit for unlocking said bit-sections and releasing the bolt cylinder as
described, a key-hole cover mounted on said lock and means for scaling said cover so

page_text: that said seal can only be broken by inserting the key into the lock and turning the
uppermost lock cylinder, substantially as described.
7. The combination of a lock having a bolt cylinder and superposed lock cylinder
and a key having separable bit as specified and means in connection with said lock
and key bit for unlocking said bit section and releasing the bolt cylinder as described,
a key hole cover mounted on said lock, a hook formed on said lock casing at one side
of said key hole and adapted to receive a strip of flexible material, an orifice through
said housing at the opposite side of the key hole, a pin, adapted to be inserted
through said flexible strip into said orifice and having lateral recess in its shaft, a
spring bolt, mounted in the upper lock cylinder and adapted to engage said recess
and means for disengaging said spring bolt, when said upper lock cylinder is turned,
substantially as described.
Dated this 20th day of November 1907
DAY, DAVIES & HUNT,
Chartered Patent Agents, 321, High Holborn, London, W.C.,
Agents for the Applicant.
DAY, DAVIES & HUNT,
Chartered Patent Agents, 321, High Holborn, London, W.C.,
Agents for the Applicant.