Improvements in and in connection with Locks.
Year: 1894

page_text: Date of Application, 8th June, 189:--Accepted, 21st July, 1894
COMPLETE SPECIFICATION.
Improvements in and in connection with Locks.
We, BENJAMIN WILLIAMS WELLS, Merchant, and MORRIS MARTIN,
Electrician both of 15 Central Wharf, Boston, Massachusetts, United States of
America 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 :-
This invention relates to an electro-protective system for the locks of doors, and
is more especially designed and adapted for stores and like places.
The doors of stores and like places are now commonly provided with a lock,
which is operated by a key usually entrusted to the clerk, whose duty it is to open
the store in the morning, the store door being closed and locked by the same person
or by the employer or another employee provided with a duplicate key. The lock
of the store door from the time of closing in the evening to the time of opening in
the morning, may be operated to unlock the door by either of these duplicate keys..
This invention has for its object to provide an electro-protective system for
stores and like places, including a novel lock for the door comprising a bolt
mechanism, constructed to be operated by two keys of different make or design, one
of which may be designated the "employee's key," and the other the "master key,"
which in practice, will usually be in the possession of the proprietor of the store.
The lock in one condition, to be hereinafter described, is preferably electrically
controlled, so that during the time the lock is so controlled, the employee's key is
rendered inoperative for the purpose of unlocking the bolt mechanism. The system
also preferably includes a registering or recording mechanism, operatively connected
to the lock and preferably located in the office of the store or like place and
accessible only to the proprietor or other duly authorized person, the said
registering mechanism, for the purpose of this invention,, being designated as the
central office message receiving instrument.
The system may and preferably will further include, an indicating device or
mechanism at the lock, operatively connected to the said lock to indicate the number
of times the bolt mechanism has been operated, the said lock indicating mechanism
preferably being constructed, so that when the lock is lawfully operated, it will
agree with the register or recording mechanism of the system, and also so constructed
to indicate the operation of the lock independent of the register or recording
mechanism: The lock indicator is also preferably constructed to be responsive for
a predetermined number of operations of the lock, but which becomes inoperative
when the highest indication is reached, and remains inoperative at the highest
indication until reset or brought to starting position by the employer or his duly
authorized agent, as will be described.
These and other features of this invention will be pointed out in the claim at the
end of this Specification.
Fig. 1 is a perspective view partially broken out of a central office receiving
instrument or registering mechanism employed in a system embodying this
invention.
Fig. 2, a front elevation of a lock embodying this invention, the face plate of the
lock being removed to more clearly show the interior construction, the door being
represented by dotted lines.
Fig. 3, a rear elevation of the lock shown in Fig. 2.
Figs. 4 and 5, details to be referred to.
Fig. 6, a diagram of circuits to enable the operation of the system to be more
clearly understood.

page_text: The lock for the door may and preferably will be made substantially as shown in
Fig. 2, wherein A represents a frame or casing of metal or other suitable material,
containing within it a lock mechanism, consisting, as herein shown, of a bolt a
adapted to be moved through a suitable slot or opening in the side a¹ of the casing
and into a suitable socket a fastened to the jamb as of the door, represented by
dotted lines.
The bolt a may be guided in its movements in any suitable manner, and is herein
shown as supported by means of a stud or projection a30, secured to or forming part
of the rear plate a of the casing A, the said stud extending into a substantially
long slot a in the bolt a. The bolt a, in the present instance, is provided on its
lower portion or edge with two notches or recesses a a', the notch as being made
much longer than the notch a', for a purpose as will be described.
.
The bolt a in accordance with this invention is designed to be operated from the
outside of the door by two keys, not herein shown, but which may be of the well-
known Yale type of key, one of the said keys in the present construction of the
lock, actuating a supplemental key a³ and the other key actuating a supplemental
key a³, the keys as a being pivotally fastened to the back plate a¹ of the casing A.
The supplemental keys as a are provided, as herein shown, with bits al a
respectively, the bit a¹0 being adapted to enter the notch as in the bolt a, and the
bit a¹ to enter the notch a'.
The outside key, which operates the supplemental key a³, I prefer to designate
as the employee's key, and that which operates the supplemental key a³ as the
master key.
The master key is designed to operate the bolt a at any time and under all
conditions, while the employee's key is designed to be rendered non-operative on
the bolt a under certain conditions, as will be hereinafter explained. To effect this
result in the present construction of the lock, the notch a' in the bolt a is made of
such length that the key as might be turned either to the right or left without
engaging the sides of the said notch, if provision were not made to practically
divide or shorten the length of the notch a, so as to enable the bit a of the key a
to move the bolt.
This may be accomplished, as herein shown, by means of a movable device or
tumbler, shown as an elbow lever a pivoted as at b to the bolt a, and having one
arm 6× provided with a finger b', normally projecting by the notch a, as shown in
Fig. 2, in which position, the said finger forms with one side 2 of the notch, a
smaller notch or receptacle 62, into which the bit a¹º is adapted to enter, when the
key as is turned to operate the bolt, the said bit engaging the side 2 of the notch to
move the bolt into its socket a² to lock the door, and engaging the finger b¹ to move
the bolt backward to unlock the door. The finger 6' is adapted to be moved from
its normal or operative position shown by full lines, Fig. 2, out of the path of
movement of the bit a of the key a³ and into its dotted line position, by a suitable
device, shown in the present instance as the armature 6 of an electro-magnet 65
suitably supported within the case A, the said armature being pivoted as at 66, and
normally lying beyond the field of its magnet and in the path of movement of the
arm 7 of the elbow lever a. The arm is shown as provided at its end with a
shoulder or projection 68 adapted to engage the end of the armature b₁.
a,
In the normal or full line position of the tumbler a¹³, the bolt may be moved into
its socket a² by the employee's key, the bit engaging the side 2 of the notch
forming one wall of the chamber 62, and on the forward movement of the bolt the
shoulder strikes the armature 6, which being fixed by its pivot 66, causes
the elbow lever a to turn on its pivot b on the continued forward movement of the
bolt a, so that by the time the bolt has entered its socket, the elbow lever will be
turned into its dotted line position Fig. 2, and the finger 6' will be withdrawn
from the path of movement of the employee's key, or in the present instance,
from the path of movement of the bit a10 of the supplemental key a³. When
the finger is raised as described, the employee's key is rendered useless or
inoperative until the finger b¹ is released from its abnormal or dotted line position;
2.

page_text: which is accomplished in the present instance, by energizing the electro-magnet o
as will be described.
The lock mechanism shown in Fig. 2 may and preferably will form part of an
electrical system, including a main or central station apparatus, preferably of the
construction shown in Fig. 1, wherein A¹ represents the enclosing case of a clock
mechanism A, of any usual or suitable construction, the casing A¹ being made of
wood or other insulating material and having as represented, a face plate c and top
plate c' of metal or other conducting material, the face plate,c being thus electrically
separated from the clock movement A². The face plate c is provided, as shown,
with the usual graduations or numbers indicative of hours and minutes, and is
provided at its center with an opening through which the hour and minute arbors
of the clock are extended, and are provided outside the face plate with the usual
hour hand c³ and minute hand c*. The face plate c has movably attached to it in
any suitable manner, a ring co provided with graduations or numbers corresponding
to the numbers or graduations on the face plate, the said ring having secured to it
one member of a circuit controller, which member is shown in the present instance
as a flat spring or pen c, secured to the inner circumference of the ring c anl
co-operating with a second member of the said circuit controller, shown as an arm
or projection.c movable with the hour hand c³. The arm c' may be secured to the
arbor of the hour hand or to the hour hand itself.
The casing A' also contains within it a second circuit controller, one member of
which may be made as herein shown, it consisting of a metal disk or wheel e8 pro-
vided with teeth or peripheral projections and mounted upon a shaft or arbor c
supported by the framework of the clock A2, the said arbor also having mounted
on it a second disk or wheel cc of insulating material and provided with teeth or
projections cd corresponding to the teeth, the alternate metal teeth eda being
made shorter than the alternate teeth cd, for a purpose as will be described.
The toothed disks or wheels c8, 8c are rotated, as herein shown, by means of a.
stud or projection on the face of a disk or wheel c¹, fast on the hour shaft or
arbor of the clock mechanism A..
The teeth of the wheels or disks c8, 8c are preferably made concaved on their
outer surface and have co-operating with them a terminal pen or brush c¹³ (see
Fig. 5) secured to an insulating support c" within the casing A', and forming the
other member of the said circuit controller, for a purpose as will be described.
The casing A', as represented in Fig. 1, also contains within it an electro-
magnet d having its pole pieces d¹, as herein represented, extended through the
top plate c¹ of the casing and co-operating with an armature d², shown as pivoted
as at d³ to lugs or brackets d' erected upon the top plate c'. The armature d²
as represented in Fig. 1 has secured to it an arm d³, provided at its front end with
a prick point or stylus de, adapted to be brought in contact with and puncture a
recording surface shown as a strip or tape d', provided with suitable graduations
to indicate different intervals of time, the graduations as herein represented
indicating hours. The recording tape d' in the present instance is shown as
mounted on a drum or reel d³ having bearings in uprights d' erected from the top
plate c', and as shown, the said recording strip is passed beneath a guide bar dio
fastened to the top plate, and the said strip is also passed through holding jaws or
arms d¹³. The recording strip d' is adapted to be fed forward under the marking
pen or stylus d' by means of a feed mechanism which may be of any usual or
suitable construction, and which is represented in Fig. 1 as a toothed feed wheel d¹
mounted upon a shaft d¹s of the clock mechanism, the said shaft being geared to
the clock mechanism so as to feed the recording strip din unison with the hour
hand of the clock. The recording strip d' in the present instance is shown as held
in engagement with the feed roll or wheel d by means of a presser roll d¹
mounted on a lever d¹ª, pivoted as at d¹ to an upright or bracket d¹³ erected from
the top plate c', the said lever having its rear arm provided, as represented in
Fig. 1, with a spring arm d¹ engaged by an adjusting screw d20, by means of which
the pressure of the roll d upon the paper may be regulated. As represented in

page_text: I
Fig. 1, the top plate c¹ is provided with two binding posts "d", both of which
are insulated from the said top plate. The electro-magnet d, which may be
hereinafter termed the register or recording magnet, has one end of its coil
connected by wire d23 to the binding post d and the other end of its coil connected
by wires dd to the binding post d.
The binding post d¹ is also electrically connected with the face plate c, which
may be accomplished as represented in Fig. 1, by connecting the said binding post
by the wire d to a contact pen or spring 2, secured to an insulating support d
located within the casing, the spring de being adapted to bear against the face
plate c.
The circuit of the lock magnet 65 as above described, is governed in part by two
circuit controllers operated from the hour a ber or shaft of the clock movement or
mechanism A2, and preferably the said circuit is also governed by a third circuit
controller located at the clock mechanism and comprising two members, one member
of which is shown in Fig. 2 as a contact spring or brush do secured to an insulating
block d³¹, and adapted to be engaged by the arm 6x of the elbow lever or tumbler,
which constitutes the other member of the circuit controller located in the lock. It
'will thus be seen that to complete the circuit of the lock magnet b³, three circuit
controllers are required to be closed in the present arrangement, namely, the circuit
controller located in the lock and the two circuit controllers operated by the clock
mechanism of the central office apparatus, as will be hereinafter more fully
.explained.
The register magnet d is included in circuit with a circuit controller at the lock,
which may be directly or indirectly governed by the movement of the clock
mechanism, and which in the present instance is shown as composed of two
members, one member being represented as a stud e on the bolt a, and the other
member as a contact pen el secured to the insulating support d³, the said contact
pen being extended into the path of movement of the stud e, so that when the bolt a
is moved forward or in the direction indicated by arrow 20, Fig. 2, to lock the door,
the said stud will be momentarily brought in contact with the pen e¹, and will
thereby momentarily close the circuit of the register magnet d, as will be more fully
described, and on the further movement of the bolt in the direction indicated by
arrow 20, the stud e will pass by and out of contact with the pen e¹ and substan-
tially into the position indicated by dotted lines Fig. 2, so that, when the bolt a is
moved backward or in the direction opposite to that indicated by arrow 20, the
stud e will be again brought in contact with its co-operating pen el, to again close
the circuit of the register magnet d. In this manner, it will be seen that the
register magnet d is energized on each movement of the bolt a, that is, when
it is moved in one direction to lock the door and when it is moved in an opposite
direction to unlock the door, the purpose of which will be hereinafter more fully
set forth.
Referring to Fig. 2, the casing A is represented as having mounted upon it three
binding posts e³, e, e, the binding posts ee being electrically separated from the
casing A as by insulating washers e, and the binding post e being represented as
electrically connected with the casing. A. The binding post e² is connected by
wire to the contact member or terminal e', while the binding post et has con-
nected to it one end e' of the coil of the electro-magnet 6, the other end e³ of the
said coil being electrically connected to the contact pen or terminal d³0.
'
The operation of the electrical circuits, as thus far described, may be more
clearly comprehended by referring to the diagram, Fig. 6, wherein the registering
apparatus is represented as located within a case B, which in practice will
preferably be provided with a door having a lock, the key of which is designed to
be retained in the possession of the proprietor or his duly authorized agent, so that
only the proper parties may have access to the registering apparatus.
:
The case Bis represented as provided with three binding posts or terminals elo, el³, 13,
the binding post es being connected by wire e" to the binding post d, and the
*binding post es being connected by wire e to the binding post d, while the binding

page_text: post is connected by wire e¹ to the contact pen or member c¹³ of one of the
circuit controllers in the clock mechanism above referred to. The binding post els
is shown as connected by wire el to one pole of a battery B', herein shown as the
negative pole, the positive pole of which is connected by wire 18 to the binding
post of the lock mechanism.
The binding post eo is connected by wire e20 to the binding post et of the lock,
and the binding post el is connected by wire e to the binding post e² of the lock.
In order that the invention may be more clearly comprehended, I will describe
the circuits including the magnets and d with the circuit controllers governing
them in their closed position, and will hereinafter more specifically describe the
manner of bringing the circuit controllers into their operative position. As above
described, the register magnet d is governed by the circuit controller comprising
the members e e', and for purpose of illustration, let it be supposed that the member e
has been brought into contact with the member e', and when in this condition, the
circuit of the register magnet d is complete, which circuit may be traced in the
diagram 6 as follows:-From the positive pole of the battery B' by wire els to
the binding post e³, thence through the metallic framework of the lock to the stud e,
thence by the contact spring e, wire e to the binding post e², which, as above
described, is insulated from the casing A of the lock. From the binding post e²,
the circuit continues by the wire e¹ to the binding post e¹² of the casing B con-
taining the registering mechanism, and from the binding post e¹³, the circuit is
continued by the wire e, binding post d², wire d³, through the register magnet d
and wires d2, d to the binding post d", thence by wire e¹³, binding post e¹³ and
wire e to the negative pole of the battery B. As soon as. the circuit of the
magnet d is completed as above described, the said magnet attracts its armature d³
and effects a marking on the recording surface d'. The circuit of the lock magnet b
as above described, is dependent in the present arrangement upon the closure of
three circuit controllers, namely, one in the lock and two in the recording apparatus.
I have represented in the diagram, Fig. 6, the circuit as closed at the various
circuit controllers, the arm 6x of the elbow lever or tumbler being in contact with
the spring do, the pen c¹³ being in engagement with a metallic tooth on the wheel c³,
and the arm being in engagement with the terminal spring c. In this case, the
circuit may be traced as follows:-From the positive pole of the battery B' by
wire el to binding post e³, thence by the metallic portion of the lock mechanism to
the tumbler arm *, thence by the contact spring do, wire es, through the magnet b³,
wire e', to the binding post e, thence by wire e20 to the binding post el⁰ of the
case B, thence by wire el to the contact pen e¹³, the wheel or disk c³, thence to the
clock movement and arm c' to the terminal spring e, thence by wire d to the binding
post d, thence by wire el, binding post e¹³ and wire e" to the negative pole of the
battery.
The lock is provided with a mechanism to indicate the operation of the bolt
mechanism and this indicating mechanism may and preferably will be made as
herein shown, it consisting of a dial f mounted on the back of the lock and provided
with graduations or numbers preferably indicating two or multiples of two, the
highest number in the present instance being eighteen.
has
The dial has co-operating with it an index or pointer f¹ mounted on a shaft f
extended into the case A and having bearings, as herein shown, in the said case and
in a bracket fastened to the back plate of the said case. The shaft
fast on it a ratchet wheel f, with which co-operates a push pawl f' and a holding
pawl, the push pawl f' being shown as secured to the bolt a and operating
on the backward movement of the bolt to rotate the ratchet wheel the distance
of two teeth, to thereby move the index or pointer f¹ the distance of two
graduations, the holding pawl f* acting to keep the ratchet wheel from rotating
when the bolt a is moved forward. The holding pawl f* may be kept in
engagement with the ratchet wheel, as represented, by a spring fr. To permit
the bolt a to be operated at will from inside of the store or other place, the
bolt a may be provided with a tumbler g pivoted as at 9 and provided with.a

page_text: E
'
fork at its lower end, which is engaged by a dog g² on a shaft g³ extended
through the back plate of the lock and provided, as herein shown, with a heal
or thumb piece 9 (see Fig. 3) by turning which the dog g² may be oscillatel
to operate the bolt in either direction. The back plate at of the lock is preferably
hinged to its casing, and in order to prevent the said plate being opened by
unauthorized persons, a locking device is provided which is under control of the
master key of the lock.
The locking device referred to, is shown in Fig. 2 as a bar 910 vertically movable
in guides attached to the side of the case A, the said bar being provided with
lugs 13, 14 to engage fingers or lugs 915, 916, on the back plate a, the said bar being
provided at its lower end with a substantially long arm g17, adapted to engage the
bit a of the supplemental key operated by the master key, so that the locking
bar go cannot be moved upward to disengage its locking projections or lugs g¹³, 914
from the fingers g1, 916, until the bit a¹ is turned by the master key out of engage-
ment with the arm 9, and when so turned, the bar 910 may be moved upward or in
the direction indicated by arrow 30, Fig. 2, by the thumb piece 920 on the outside
of the lock, the said thumb piece having a stem or shank g" extended through a
-slot 22 in the case A and fastened to the bar 910.
The system as above described is designed for the protection of stores and
like places from being entered between predetermined intervals of time, except
by the person holding the master key of the lock. After a given hour, which
may be supposed to be the hour of closing, say for instance, six o'clock p.m.,
the employee's key is rendered inoperative, and the bolt mechanism cannot be
operated by the employee's key from this time until the time-of opening in the
morning, which may be supposed to be 7 o'clock. When the person, who closes
the store and locks the door, operates the bolt mechanism, which may be effected
with either the master key or the employee's key, the tumbler a¹ on the
forward movement of the bolt is removed out of the path of movement of the
employee's key as above described, it being moved into the dotted line position
shown in Fig. 2. If now an attempt should be made by a person having an
employee's key to unlock the door after it has been locked, the key would turn
in the substantially long notch a of the bolt and would not operate the bolt.
When the door is locked, the circuit controller or stud e is brought into engage-
ment with the contact pen e¹ and closes the circuit of the magnet d as above
described, thereby effecting upon the recording strip or surface d', a record of
the locking of the door, and the time at which the same was locked.. While
the tumbler a¹ is in its elevated position, the bolt still remains under the
control of the master key, and, if after the hour of closing, the master key
should be used to unlock the door, a record of this fact would be made upon
the recording surface, for the stud e on its movement backward from its dotted
line position Fig. 2 into its full line position, would again close the circuit of
-the register magnet d. The locking mechanism is designed to be again placed
in condition to be operated by the employee's key after the lapse of a pre-
determined interval of time, which may be from 6 o'clock at night, the hour of
closing, until 7 o'clock the following day, the hour of opening. The hour at
which it is desired to again place the lock in condition to be operated by the
employee's key, may be selected by turning the graduated ring c³ so as to have,
for instance, the hour 7 register with the arrow 50 on the face plate shown in
Fig. 1, when it is desired to open the store or like place at 7 o'clock a.m.
When the graduated ring c is placed so that its graduation 7 is in line with
the arrow 50), the member c of the circuit closer will be brought into proper
position to have the arm or member c', which co-operates with it, make contact
with the terminal pen ce at 7 o'clock a.m. and at the same time, the stud con
the disk or wheel 10 will have moved the disks ce so as to bring a raised or
circuit closing tooth of the same into engagement with the terminal pen c¹³, and
when the circuit closers of the registering mechanism are in this condition, the
magnet 6 is automatically energized, which attracts its armature 64 from its

page_text: lotted line position shown in Fig. 2 towards its pole pieces, thereby removing -
he said armature from engagement with the arm of the tumbler us, and
bermitting the said tumbler to fall by gravity into its full line or operative
position, thereby placing the bolt mechanism in condition to be operated by the
employee's key. The alternate teeth on the insulating disks, which project
beyond the corresponding teeth of the disk c8, are designed to break or open the
circuit of the magnet 6 once in twelve hours, so that the circuit of the magnet b
s closed or put in operative condition only once in twenty-four hours, that is,.
when the arm c is in contact with the pen c, and the pen c¹³ is in contact with
a conducting tooth on the disk c8, which prevents the magnet releasing the
tumbler at 7 o'clock in the evening. For instance, the proprietor may want the
store to be closed at 7 o'clock a.m., and during the day, for instance at noon--
time, he may set the graduated ring c³ so that the number 7 on the ring
registers with the arrow 50. It will be seen that the circuit controlling member c
at 7 o'clock in the evening would make contact with the terminal spring c® and
would energize the magnet 6, if the circuit was not broken at some other point..
In the present arrangement, the circuit is broken by having the pen c¹³ engge
an insulated tooth at seven o'clock in the evening, and when seven o'clock in
the morning is reached, the arm will make contact with the spring c, and
the pen will at such time be in contact with a conducting tooth of the
wheel c.
"
In order to prevent the battery running down while the arm is in engagement.
with the pen c and while the pen c¹³ is in engagement with a conducting tooth on
the disk co, I prefer to employ the tumbler arm 6* as one member of a circuit
controller, the other member of which is the spring do, so that as soon as the tumbler
is released by the energizing of the lock magnet 65, the circuit of said magnet will
be opened substantially in an instant after the said circuit has been completed as-
above described.
When the bolt is moved backward to unlock the door, the ratchet wheel f^ is
moved the distance of two teeth so as, to turn the index or pointer f¹ the distance.
of two graduations on the lock indicator or dial f, whereby the employer may have
a record or indication at the lock that the said lock has been operated after the
hour for closing.
The lock indicator is especially advantageous in that it prevents short circuiting
or cutting the circuit wires, etc. for the lock cannot be opened without showing it on.
the dial, even though no record is made at the central station, and if the door is
opened while the electric circuits remain intact, the lock indicator will agree with.
the number of indications or marks on the recording surface d'.
In order to prevent an employee from short circuiting the register and then.
operating the lock indicator a sufficient number of times to cause it to agree with
the registration on the recording surface d' at the central office, the ratchet wheel -
is rendered inoperative after the lock has been opened and closed a sufficient number
of times, to bring the pointer or index f in register with a predetermined indication
on the dial, herein shown as 18. The ratchet wheel f4 may be rendered inoperative.
as represented in Fig. 2 by securing it to a blank or guard h, which prevents the-
push pawlf from engaging the teeth of the ratchet after the ratchet wheel has.
been turned to bring the index to the predetermined indication on the dial, and as a
result, a further movement of the bolt mechanism will cause the push pawl f³ to.
push back and forth on the blank or guard h, thus preventing the lock indicator-
from being turned beyond the highest registration by movement of the bolt and.
requiring the said indicator to be reset to zero by the employer.
At certain times, say for instance when taking account of stock in the store, it.
may be desired to render the employee's key operative at any time during specified
hours, and to effect this result, a circuit controller included in a shunt around the
central office apparatus is arranged so as to render the employee's key operative for
any desired time.. This may be effected as shown in Fig. 6, by means of a circuit
controller having its movable member m, shown as a pivoted lever, joined by

page_text: wire m' to the binding post e¹³, and its co-operating member, shown as a stud m²,
joined by wire m³ to the binding post elo, so that when the member m is moved
into engagement with the member m², the shunt circuit around the receiving
apparatus is closed, the bolt a, at such time, being supposed to be in its socket.
By an inspection of Fig. 6, it will be seen that as soon as the tumbler b* is
brought into engagement with the contact pen 30, on the forward movement of the
bolt a to lock the door, the shunt circuit will be closed in the lock and the inaguet 65
energized to release the said tumbler and permit it to drop in position to be
operated by the employee's key from outside the door. This shunt circuit may be
traced as follows:-viz. from the positive pole of the battery B¹ by wire el8,
birding post es, lock mechanism and tumbler arm 6x to contact pen d30, thence by
wire e³, magnet 6³, wire e², binding post e¹, wire e20 to binding post e10, thence by
wire m³, contact stud m², lever m, wire m', to binding post e¹³, thence by wire e' to
the negative pole of the battery-B.-
.=.=
At the expiration of the predetermined time, the switch or circuit controller m
may be moved to open the shunt circuit and thereby render the employee's key
inoperative on the locking of the door until the regular opening hour. This circuit
controller just referred to, may be in itself a time movement operated by a clock,
but is herein shown as a manually operated switch.
1 may prefer to use the construction of lock indicator herein shown and
described, but I do not desire to limit my invention in this respect, as it is evident
I may employ instead thereof, a continuous counter after the manner of the ordinary
gas meter indicator or such as commonly employed for recording the revolutions of
shafting.
For convenience in construction, I prefer to make the toothed disks or
wheels c, ce as herein shown, but it is evident that the same may be made in other
ways, for instance, a single metal disk may be used having its alternate teeth made
of insulating material.
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 an electro-protective system, a lock provided with a circuit controller,
and a registering apparatus provided with an electro-magnet in circuit with said
circuit controller and energized by the operation of the said lock, substantially as
described.
2. In an electro-protective system, a lock constructed to be operated by either
of two keys in one condition and to be operated by only one of said keys in another
condition, an armature in said lock to hold it in its second condition, an electro-
magnet to operate said armature to restore the lock into its first condition, and a
circuit controller to govern the operation of said electro-magnet, substantially as
described.
3. In an electro-protective system, a lock constructed to be operated by either of
two keys in one condition and to be operated by only one of said keys in another
condition, an armature in said lock to hold it in its second condition, an electro-
magnet to operate said armature to restore the lock into its first condition, a clock
mechanism, a circuit controller for said electro-magnet operated by said clock
mechanism to close the circuit at a predetermined interval of time, and a second
circuit controller operated by the clock mechanism to close the circuit including the
electro-magnet at a predetermined interval of time less than the first interval of
time, substantially as described.
4. In an electro-protective system, a lock provided with a circuit controller, and
a registering apparatus provided with a recording surface, a marking device to operate
thereon, and an electro-magnet in circuit with said circuit controller and energized
by the operation of said lock, substantially as described.
5. In an electro-protective system, a lock constructed to be operated by either of
wo keys in one condition and to be operated by only one of said keys in another

page_text: condition, an armature in said lock to hold it in the second condition, an electro-
magnet to operate said armature to restore the lock into its first condition, a
registering apparatus provided with an electro-magnet, a circuit controller in said
lock actuated by the operation of the lock to energize the register electro-magnet,
and a circuit controller at the registering apparatus to energize the lock magnet,
substantially as described.
6. In an electro-protective system, a lock constructed to be operated by either
of two keys in one condition and to be operated by only one of said keys in another
condition, a device in said lock to hold it in its second condition, an electro-magnet
to operate said device to restore the lock into its first condition, a registering
apparatus provided with an electro-magnet, a circuit controller in the said lock
actuated by the operation of the lock to energize the register electro-magnet, a
circuit controller at the registering apparatus to energize the lock magnet, and
an indicator at the lock actuated by the operation of the lock, substantially as
described.
7. A lock provided with a bolt mechanism and with a movable tumbler
co-operating with the said bolt mechanism to permit the said bolt to be operated
by either of two keys of different design or make, means rendered effective by the
movement of the bolt to move said tumbler out of the path of movement of one of
said keys to render said key inoperative, and means to restore the said tumbler to
its normal position in the path of movement of its co-operating key to render the
latter key again operative, substantially as described.
8. In an electro-protective system, a lock constructed to be operated by
either of two keys in one condition and to be operated by only one of said keys
in another condition, a device in said lock to hold it in its second condition,
an electro-maguet to operate said device to restore the lock in its first condition,
a registering apparatus provided with an electro-magnet, a circuit controller
in the said lock actuated by the operation of the lock to energize the register
electro-magnet, and a circuit controller to energize the lock magnet, substantially
as described.
9. In an electro-protective system, a lock constructed to be operated by either of
two keys in one condition and to be operated by only one of said keys in another
condition, a device in said lock rendered effective by the movement of the bolt to
hold it in its second condition, and means to operate said device to restore the lock
into its first condition, substantially as described.
10. A lock provided with a bolt mechanism, and with a device to permit the said
bolt mechanism to be operated by either of two keys of different make or design,
means rendered effective by the movement of the bolt to operate said device to
render one of said keys inoperative, and means to operate said device to render the
said key again operative, substantially as described.
11. A lock provided with a bolt mechanism, and with a device to permit
the said bolt mechanism to be operated by either of two keys of different make
or design, means rendered effective by the movement of the bolt to operate said
device to render one of said keys inoperative, and means to operate said device
to render the said key again operative, and an indicating device to denote the
number of operations of the lock to a predetermined number, substantially as
described.
12. In an electro-protective system, a lock provided with a circuit controller,
a registering apparatus provided with an electro-magnet in circuit with said circuit
controller and energized by the operation of said lock, a circuit controller in said
registering apparatus, a shunt circuit for the circuit controller in the said registering
apparatus and a circuit controller for said shunt circuit, substantially as
described.
13. The combination with a lock of an indicator responsive to the operation of
5 the lock for a predetermined number, and means to render the said indicator non-
responsive to the operation of the lock and yet permit the said lock to be operated
B

page_text: after the said predetermined number of operations at which the indicator is rendered
non-responsive, substantially as described.
14. The combination with a lock provided with a removable cover or plate, of a
locking device for said cover or plate under the control of the key for the lock,
substantially as described.
Dated this Seventh day of June 1894.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.