IMPROVEMENTS IN REGISTERING PADLOCKS
Year: 1882

page_text: LETTERS PATENT to William Robert Lake of the firm of Haseltine Lake
and Co, Patent Agents Southampton Buildings London for an Invention of
"IMPROVEMENTS IN REGISTERING PADLOCKS" Communicated to him from
abroad by Roland Greene Usher and Charles C Dickerman both of Boston
Massachusetts United States of America
PROVISIONAL SPECIFICATION left by the said William Robert Lake at
the Office of the Commissioners of Patents on the 20th September 1882.
WILLIAM ROBERT LAKE, of the Firm of Haseltine Lake & Co Patent Agents
Southampton Buildings London "IMPROVEMENTS IN REGISTERING PADLOCKS
[A communication to him from abroad by Roland Greene Usher and Charles
C Dickerman both of Boston Massachusetts United States of America]
"
This invention relates to that class of padlocks known as combination and
registering padlocks, the object being to produce a padlock of great strength and
durability, simple in construction, comparatively inexpensive, absolutely impossible
to unlock, with anything but its true key, and which will automatically indicate
and register by consecutive numbers each unlocking and locking thereof."
The said invention comprises improvements in the form, construction and
arrangement of the locking and securing devices in the shell, and of the registering
devices in the shell
The locking devices, consisting of a sliding block which I call the tumbler
carrier, containing in it the tumblers, a safety guard, and a small metallic bar
located in a groove in the tumbler carrier, which I will term a fence, are placed in
one part of the shell, the hasp and locking dog, partly in and between both parts
of the shell, and the devices for registering which consist of a series of circular
concentric plates, called the numeral plates, the pawls which engage and move the
numeral plates, the lever carrying the pawls, and the spring dogs which hold the
numeral plates in position, are placed in the other part of the shell and all are so
arranged that when the two parts of the shell are secured together, each part will
perform the required functions in connection with the other parts.

page_text: In carrying the said Invention into practice I provide an opening in the front
side of the shell through which the figures on the numeral plates are seen and
indicate the number of times the padlock has been unlocked and locked. This
opening is covered with glass or other transparent substance set in the inside of
the metal of the shell, protecting the numeral plates from being moved from the
outside. There is a stud or pivot on which the hasp works, and a stud on which
a locking dog is pivoted, also a stud in the centre of the padlock which extends
from one part of the shell to the other, bracing both against outward pressure or
blows, and securing the two parts of the shell together, and also serving as a
fulcrum for a pawl-bearing lever, and a centre around which the numeral plates
revolve. The hasp swings upon one of the studs, having a catch on the inner side
of its locking end and an arm beyond the stud, with a stud on it which works in
an opening through the pawl-carrying lever. There is a swinging locking dog
with a catch on its working end which is made to engage the catch on the locking
end of the hasp. It is pivoted on the stud carrying the locking dog and is
actuated and held in place by a spring which throws its catch into the catch of
the hasp, when that is brought down, and holds it there until it is disengaged by a
forward movement of the tumbler-carrier striking the arm on the lower end thereof.
There is an arm on the lower end of the locking dog. A spring throws the hasp
back when it is disengaged from the catch of the locking dog and another spring
throws the catch of the locking dog forward when the hasp is brought down and
the tumbler-carrier is released from pressure by the key causing it to engage and
retain the catch of the hasp, and lock the padlock.
A
I provide a safety-guard, which, in connection with the fence, blocks the forward
movement of the tumbler-carrier whenever anything is inserted in the key-way,
excepting the true key of the padlock, by vibrating on its supporting stud.
spring-washer is placed over the safety-guard on the same stud to prevent any
movement of the said safety-guard except as it is forced by a movement of
the fence.
The pawl-carrying lever has the central stud as its fulcrum, and an opening
through it in which another stud on the arm to the hasp works, whereby the lever
is given a reciprocating motion when the hasp is raised and lowered. This lever
is bevelled to make room for a spring-dog over which it passes When the hasp is
raised the end of this lever bearing the pawls is thrown backward to be in position
to engage a notch in the flange of the numeral plates, and when the hasp is brought
down the pawl end of the lever is driven forward, and the pawl engaging the
notches in the flange of the numeral plates which they are intended to engage
carries them forward and registers one additional by the figures exposed at the
opening at the front of the padlock. The pawls on the lever are so placed and
arranged that they work into the notches in the flanges on the back of the numeral
plates, one or more of which is carried forward one notch or number when the
hasp is lowered into its place so that the catch of the locking dog will engage it.
Each of these pawls, except the inner one, has a foot extending down a little below
the part which is to engage the notches in the flanges of the numeral plates and
which slides around on the flat part of the back of the numeral plate next inside
of the one which the pawl is to engage, carrying the pawl a little above the top of
flange on the numeral plate so that it cannot engage any of the notches in the
flange of the numeral plate under it until the foot reaches and falls into a notch in
the flat part of the next inside numeral plate made to receive it, there being only
one such in each numeral plate. When the foot falls into this notch then the pawl
will engage a notch in the flange of the numeral plate next outside and carry it
forward one notch or registering figure shewing through the opening in the front
of the padlock that ten numbers have been registered or that ten numbers have
been registered since the foot had fallen into the notch before described. Thus the
innermost numeral plate is carried entirely around once before, and when, the next
outer numeral plate is engaged by the pawl over its flange and carried forward one
notch so that if all the numeral plates had shewed the cipher in the beginning,

page_text: the inner plate would have brought the cipher around so as to shew again and the
next plate would show the figure one.
The second pawl from the centre carries all the pawls outside of it above the
top of the flanges of the numeral plates, by a lip on each, extending a little over
the pawl inside of it, so that none of the outer numeral plates can be engaged and
moved by the pawls until the numeral plate next inside has been carried entirely
around.
Thus when the inmermost numeral plate has been carried clear around ten
times the next outer one will have been carried entirely around once and the foot
of the next outer pawl sliding around on its flat part will fall into the notch in it
and the pawl will engage a notch in the flange of the second outer plate, and carry
it forward one notch or figure, and shew at the opening in the front of the padlock
the figures indicating one hundred (100) and when the innermost numeral plate
has been carried around one hundred times and the next outer numeral plate has
been carried around ten times, and the second outer numeral plate has been carried
around once, then the foot of the third pawl will fall into the notch in the flat part
of the nuineral plate inside of it, and the pawl will engage a notch in the flange of
the next outer plate and move it forward one notch or figure shewing the figures
indicating one thousand (1000), and so on until the numerating capacity of all the
numeral plates combined has been completely taken up, five plates numbering
99,999 openings and closing of the hasp of the padlock.
The numeral or registering plates are flat, circular, and concentric, each having
the numerals one to nine inclusive, and a cipher, on its face filling the entire
circumference at equal distances apart, the faces of all the plates being in a plane.
A greater or less number of plates than five may be used by arranging the lever
and pawls and spring dogs to correspond with the number of plates. Each of the
numeral plates has a flange on its reverse or back side standing out at right angles
to the plane of its face in which are cut ten notches having equal spaces between
them, and one notch in the flat part.
There is a set of spring-dogs fastened on the outside of the plate covering -the
numeral plates, the dogs reaching through an opening in the plate and engaging
in the notches in the flange on the numeral plates to hold them in position as they
were left by the last movement of the hasp and lever until another movement of
the hasp is made.
The fence may be movable in the direction of its length, but it may be fixed in
which case the safety guard will be unnecessary. It is a small metal bar pivoted to
the safety-guard, having a perpendicular width of about twice its thickness, and as
many notches or gates in its upper edge as there are tumblers in the tumbler-
carrier, and extending to the circumference of the padlock in and through a groove
on the back side of the tumbler carrier made for it at right angles to, and across,
the grooves in the tumbler-carrier which carries the tumbler
There is a shoulder in the forward part of the tumbler-carrier into which the
engaging point of the guard falls when the fence is moved by forcing a false
key or other instrument into the key-way to attempt to unlock or pick the
padlock.
There are perpendicular grooves in the tumbler-carrier in which the tumblers and
their actuating springs are placed and there are notches called gates in the tumblers,
also notches called gates in the fence.
A pivot on the end of the tumblers enters the hollow of a small spiral spring
which keeps the tumbler in its proper position and there is a small spiral spring to
hold the tumbler in its proper position so that its gate is not opposite the gate
in the fence or in range with the gate in any other tumbler.
A cap or cover secures and guides the tumbler carrier. The tumbler-carrier
contains a groove for the fence grooves for the tumblers and their springs, a key-
way located to correspond with the notch in the tumblers in which the key works
and having a projecting forward end, which, when the tumbler carrier is pushed
forward by the key will strike the arm of the locking dog.

page_text: A cavity in the rear part of the tumbler-carrier gives room for the flange on the
rear end of the fence and the stud on the rim which works in a hole through the
flange of the fence.
The tumblers are located in grooves made in the tumbler-carrier for them and
their springs in the side opposite to the groove for the fence and at right angles to
it and crossing it cutting into it about half its depth and about half the width of
the tumblers. Each tumbler has a gate or notch in the side of it towards the fence
about half its width.
These gates are placed at distances from the end of the tumbler varying in each
tumbler, so that if the tumblers are placed in exact range the gates will not be in
range, and if the gates in the tumblers are not all in exact range, one or more of
the tumblers will have its solid substance lying through one or more of the gates
in the fence, and consequently the tumbler carrier cannot be moved forward and
the padlock cannot be unlocked: Therefore to unlock the padlock all the gates in
all the tumblers must be brought in exact range over the fence. This is only
accomplished by a flat or plate key made and fitted for the lock with its edge
towards the tumblers in one irregular or crooked line, the irregularities in the line
corresponding exactly to the differences in location in the tumblers of the gates
through them, so that when the key is pushed into the key-way it acts like a
wedge behind each of the tumblers, driving them out of range with each other but
bringing the gates in them all exactly in range, when the tumbler carrier may be
driven forward by pushing with the key so that it will, by its forward part, strike
the arm of the locking dog, and disengage its catch from the catch of the hasp
when the spring will throw up the hasp and the padlock is unlocked.
It is obvious that to lock the padlock it is only necessary to bring the hasp
down when the spring will cause the catch of the locking dog to engage the catch
of the hasp..
Each locking of the padlock moves the numeral plates, as before explained, to
indicate one greater number in the opening in the front of the shell.
Having the shell made with an inner rim or shell, with a space between the two,
prevents injury to the working parts of the padlock or interference with their
proper action which might occur should the padlock fall accidentally upon the
floor or ground, or be hit by any foreign hard substance, and by such fall or blow
the shell be pressed inwardly.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Robert Lake in the Great Seal Patent Office on the
20th March 1883.
"7
WILLIAM ROBERT LAKE of the firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London, "IMPROVEMENTS IN REGISTERING' PADLOCKS
A communication to me from abroad by Roland Greene Usher and Charles
C Dickerman both of Boston, Massachusetts, United States of America...
"
"
This Invention relates to that class of padlocks known as combination and
registering padlocks, its object being to produce a padlock of great strength and
durability, simple in construction, comparatively inexpensive, impossible to unlock
with anything but its true key, and which will automatically indicate and register
by consecutive numbers each unlocking and locking thereof
The said Invention comprises improvements in the form, construction, and
arrangement of the locking and securing devices, and of the registering devices, in
the shell.
The locking devices consisting of a sliding block which I call the tumbler
carrier, containing in it the tumblers, a safety-guard, and a small metallic bar
located in a groove in the tumbler carrier, which I will term a fence, are placed in
one part of the shell; the hasp and locking dog, partly in and between both parts
of the shell, and the devices for registering, which consist of a series of circular
concentric plates called the numeral plates, the pawls which engage and move the
numeral plates, the lever carrying the pawls, and the spring dogs which hold the
numeral plates in position are placed in the other part of the shell and all are so
arranged, that, when the two parts of the shell are secured together each part will
perform the required functions in connection with the other parts.
In the accompanying drawing.
Figure 1 shows a front view of the padlock locked having an opening through.
the shell to expose to view the registering figures.
Figure 2 is a vertical transverse section of the shell; and a portion of the locking.
and registering devices in it.
Figure 3 shows the back or lower part of the shell open and a portion of the
locking devices, and the lever for transmitting motion from the hasp to the numeral
plates.
Figure 4 shows the front or upper part of the shell, and the cover or plate over
the numeral plates, with openings through which the pawls reach the numeral
plates, and the spring dogs, which hold the numeral plates in position.
Figure 5 is a view of the under or backside of one numeral plate, having a
flange on it perpendicular to the plane of the face of the plate with ten notches in
it at equal distances apart, and one notch in the flat part of it, in which the
pawls engage to move the numeral plates, and into which the spring dogs fall to
keep the numeral plate in position.
Figure 6 is a front view of five numeral plates in position with their faces in
a plane, as laid in the padlock for service.
.:0.
Figure 7 shows the opposite side of the plate or cover shown in Figure 4 with
the grooves in which the flanges on the numeral plates work.
"
Figure 8 shows the front or top side of the pawl carrying lever with the pawls
and their springs on it.

page_text: .
Figure 9 is an edge view of the lever shown in Figure 8 and the working
ends of the pawls and their springs
Figure 10 is a transverse section of the pawl bearing lever through one of the
pawls.
Figure 11 is a side view of the key used in this padlock.
Figure 12 is a top view of the case or cover, in or under which the tumbler
carrier is placed.
Figure 13 is a front end view of Figure 12, and of the tumbler carrier and the
gate in it through which the fence works.
Figure 14 shows the reverse or under side of Figure 12, the case or cover of the
tumbler carrier and the tumbler carrier in it, and the gate in the tumbler carrier
in which the fence is placed.
Figure 15 shows a rear end view of the case of the tumbler carrier, and of the
tumbler carrier in it, the gate for the fence, the key way, a cavity to give room for
the flange on the end of the fence, and the stud in the shell on which the flange on
the fence is supported and guided.
Figure 16 shows a cross section of the tumbler carrier its cover or case, a
tumbler in it, a tumbler spring, the key way, and the gate in the tumbler carrier
for the fence.
Figure 17 is a top edge view of the tumbler carrier with the grooves in it for
the tumblers.
Figure 18 is a front-side view of the tumbler carrier with the grooves in it for
the tumblers.
Figure 19 is a bottom edge view of the tumbler carrier with the openings in it
in which the tumbler springs are located.
Figure 20 is a side view of the tumbler, with a notch which I call a gate, in it
and the pivot on the end of it which enters the spiral spring which throws the
tumbler in its proper position when the padlock is locked. A notch in the lower
left corner which corresponds to the key way in the tumbler carrier. The number
of tumblers in a padlock may be from one upwards to five or even more, according
to the number of changes in the combination desired. These tumblers have the
gate in them which passes over the fence located differently in each one, and the
tumbler carrier cannot be moved forward to disengage the locking dog from
the hasp, until all the gates for the fence in all the tumblers are in exact line over
the fence, and when they are so the tumbler carrier can be pushed forward with
the key, it and the tumblers sliding over the fence without moving it.
Figure 21 shows the inside of the back or lower part of the shell, with the studs
upon which the hasp, and locking dog are pivoted. The safety guard and a small
notched bar which is termed a fence, pivoted at one end to the safety guard, and
extending through a groove called a gate in the under side of the tumbler carrier
(which is not shown in this Figure) to the outer circumference of the inside of the
shell, where it has a flange with a hole through it which goes over a small stud or.
pin in the shell of the padlock.
Figure 22 is a side view of the metal bar called a fence.
Figure 23 is a cross section of one half of the shell showing it as having an
inner rim or shell separated from it by an air space, and having the centre stud
cast or made integral with the shell.
Figure 24 is a plan view of the parts shown in Figure 23.
Figure 25 is a side view of the centre stud when made separate from the shell.
Figure 26 is an inside view of the shell showing the fence in a fixed
position.
Similar letters of reference indicate corresponding parts in all the figures.
A is the shell or case of the padlock. B is the opening in the front side of the
shell through which the figures on the numeral plates are seen and indicate the
number of times the padlock has been unlocked and locked. This opening is 5

page_text: covered with glass or other transparent material set in the inside of the metal of
the shell, protecting the numeral plates from being moved from the outside. C is
a stud or pivot on which the hasp works. D is a stud on which the locking dog
is pivoted. E is the stud in the centre of the padlock which extends from one
part of the shell to the other, bracing both against outward pressure or blows, and
securing the two parts of the shell together, and also serving as a fulcrum, for the
pawl-bearing lever, and a centre around which the numeral plates revolve. F is
the hasp swinging upon the stud D and having a catch on the inner side of its
locking end and an arm beyond the said stud, with a stud on it which works in an
opening through the pawl carrying lever. A' is the arm on the rear end of the
hasp. A2 is the stud on the arm of the hasp. A³ is a swinging locking dog with
a catch on its working end which is made to engage with the catch on the locking
end of the hasp. It is pivoted on the stud D and is actuated and held in place by
a spring, which throws its catch into the catch of the hasp, when the latter is
brought down, and holds it there until it is disengaged by a forward movement
of the tumbler carrier striking the arm on the lower end thereof. A' is the arm
on the lower end of the locking dog. A³ is the spring which throws the hasp back
when it is disengaged from the catch of the locking dog. A is a spring which
throws the catch of the locking dog forward when the basp is brought down, and
the tumbler carrier is released from pressure by the key causing it to engage and
retain the catch of the hasp, and lock the padlock. A' is what is termed the safety
guard, which, in connection with the fence, blocks the forward movement of the
tumbler carrier whenever anything is inserted in the key-way but the true key of
the padlock, by vibrating on its supporting stud. As is a spring washer placed
over the safety guard on the same stud, to prevent any movement of the safety
guard A7 except as it is forced by a movement of the fence. A is the pawl
carrying lever having the central stud E as its fulcrum, and an opening through it
in which the stud A³, on the arm of the hasp works, whereby a reciprocating motion
imparted to the lever when the hasp is raised and lowered. This lever is bevelled
as shown at a to make room for the spring dog E' over which it passes. When the
hasp is raised the end of this lever bearing the pawls is thrown backward to be in
position to engage with a notch in the flange of the numeral plates, and when the
hasp is brought down the pawl end of the lever is driven forward and the pawls
engaging with the notches in the flange of the numeral plates which they are
intended to engage, carries them forward and registers by the figures exposed at
the opening B, at the front of the padlock. G, G, are the pawls on the lever A° so
placed and arranged that they work into the notches in the flanges on the back of
the numeral plates, one or more of which is carried forward one notch or number
when the hasp is lowered into its place so that the catch of the locking dog will
engage it. Each of these pawls except the inner one, has a foot extending down a
little below the part which is to engage with the notches in the flanges of the
numeral plates, and which slides around on the flat part of the back of the numeral
plate next inside of the one which the pawl is to engage, carrying the pawl a little
above the top of the flange on the numeral plate, so that it cannot engage any of
the notches in the flange of the numeral plate under it, until the foot reaches, and
falls into a notch in the flat part of the next inside numeral plate made to receive
it, there being only one such in each numeral plate. When the foot falls into this
notch then the pawl will engage with a notch in the flange of the numeral plate
next outside and carry it forward one notch or registering figure, showing through
the opening in the front of the padlock that ten numbers have been registered or
that ten numbers have been registered since the foot had fallen into the notch
before described. Thus the innermost numeral plate is carried entirely around
once, before, and when, the next outer numeral plate is engaged by the pawl over
its flange and carried forward one notch, so that if all the numeral plates had
showed the cipher in the beginning, the inner plate would have brought the cipher
around so as to show again and the next plate would show the figure one.

page_text: The second pawl from the centre carries all the pawls outside of it above the top.
of the flanges of the numeral plates by a lip on each, extending a little over the
pawl inside of it, so that none of the outer numeral plates can be engaged
and moved by the pawls until the numeral plate next inside has been carried
entirely around.
Thus when the innermost numeral plate has been carried clear around ten times
the next outer one will have been carried entirely around once and the foot of the
next outer pawl: sliding around on its flat part will fall into the notch in it and the
pawl will engage with a notch in the flange of the second outer plate and carry it
forward one notch or figure, and show at the opening in the front of the padlock
the figures indicating one hundred, (100) and when the innermost numeral plate
has been carried around one hundred times, and the next outer numeral plate has
been carried around ten times, and the second outer numeral plate has been carried
around once, then the foot of the third pawl will fall into the notch in the flat part
of the numeral plate inside of it, and the pawl will engage a notch in the flange of
the next outer plate. and move it forward one notch or figure showing the figures
indicating one thousand (1000) and so on until the numerating capacity of all the
numeral plates combined has been completely taken up, five plates numbering
ninety nine thousand nine hundred and ninety nine openings and closings of the
hasp of the padlock..
E¹ Figure 6 are the numeral or registering plates, flat, circular, and concentric,
each having the numerals one to nine inclusive and a cipher on its face filling the
entire circumference at equal distances apart, the faces of all the plates being in a
plane. A greater or less number of plates than five may be used by arranging the
lever A and pawls, and spring dogs to correspond with the number of plates.
Each of the numeral plates has a flange on its reverse or back side standing out at
right angles to the plane of its face in which are cut ten notches having equal
spaces between them and one notch in the flat part. E is the flange on the back
of the numeral plate. E³ are the notches in the flange of the numeral plate. H is
the notch in the flat part of the back side of the numeral plate. E' is a set of
spring dogs fastened on the outside of the plate covering the numeral plates, the
dogs reaching through an opening in the plate, and engaging in the notches in
the flange on the numeral plates to hold them in position as they were left by the
last movement of the hasp and lever, until another movement of the hasp is made.
E³ Figure 21 is what I term a fence here shown as movable in the direction of
its length, but it may be fixed as shown in Figure 26, in which case the safety
guard A' will be unnecessary. The said fence is a small metal bar pivoted to the
safety guard A' having a perpendicular width of about twice its thickness having
as many notches or gates in its upper edge as there are tumblers in the tumbler
carrier, and extending to the circumference of the padlock in and through a groove
on the back side of the tumbler carrier made for, it at right angles to and across
the grooves in the tumbler carrier which carries the tumblers. E is the engaging
point of the safety guard A7 E7 is the shoulder in the forward part of the
tumbler carrier into which the engaging point E6 falls when the fence E is moved
by forcing a false key or other instrument into the key-way to attempt to unlock
or pick the padlock. Es represents perpendicular grooves in the tumbler carrier in
which the tumblers and their actuating springs are placed. E' represents notches
called gates in the tumblers. L. represents notches called gates in the fence E³.
b represents a pivot on the end of the tumblers which enters the hollow of a small
spiral spring which keeps the tumbler in its proper position. O' represents a
small spiral spring to, hold the tumbler in its proper position so that its gate is not
opposite the gate in the fence or in range with the gate in any other tumbler.
O represents the key way in the tumbler carrier. 0³ represents the cap or
cover which secures and guides the tumbler carrier. O represents the tumbler
carrier containing a groove for the fence, grooves for the tumblers and their springs,
and a key-way located to correspond with the notch in the tumblers in which the

page_text: key works, and having a projecting forward end which when the tumbler carrier
is pushed forward by the key will strike the arm of the locking dog.
05 represents a cavity in the rear part of the tumbler carrier to give room for;
the flange on the rear end of the fence, and the stud on the rim which works in a
hole through the flange of the fence. W is the forward and striking end of the
tumbler carrier 0% 0% is the flange at the rear end of the fence next the
circumference of the shell, and the stud which supports and guides it. X is a
tumbler, of which five are required in the padlock shown.
These tumblers are located in grooves made in the tumbler carrier for them and
their springs, in the side opposite to the groove for the fence and at right angles
to it, and crossing it cutting into it about half its depth, and about half the width
of the tumblers. Each tumbler has a gate or notch in. the side of it towards the
fence about half its width. These gates are placed at distances from the end of
the tumbler varying in each tumbler, so that if the tumblers are placed in exact
range the gates will not be in range, and if the gates in the tumblers are not all
in exact range one or more of the tumblers will have its solid substance lying
through one or more of the gates in the fence, and consequently the tumbler carrier
cannot be moved forward and the padlock cannot be unlocked. Therefore to
unlock the padlock all the gates in all the tumblers must be brought in exact
range over the fence. This is only accomplished by a flat or plate key made and
fitted for the lock with its edge towards the tumblers in an irregular or crooked
line, the irregularities in the line corresponding exactly to the differences in
location in the tumblers of the gates through them, so that when the key is pushed
into the key-way it acts like a wedge behind each of the tumblers, driving them out
of range with each other, but bringing the gates in them all exactly in range when
the tumbler carrier may be driven forward by pushing with the key so that it will
by its forward part strike the arm of the locking dog, and disengage its catch
from the catch of the hasp, when the spring A5 will throw up the hasp and the
padlock is unlocked.
It is obvious that to lock the padlock it is only necessary to bring the hasp
down when the spring A³ will cause the catch of the locking dog to engage the
catch of the hasp.
Each locking of the padlock moves the numeral plates as before explained to
indicate one unit more in the opening in the front of the shell.
Constructing the shell A with an inner rim or shell M and with a space N
between the two as shown in Figure 23 prevents injury to the working parts of
the padlock or interference with its proper action which might occur should the
padlock fall accidentally upon the floor or graund or be hit by any hard substance
and by such fall or blow the shell A be pressed inwardly.
Having thus fully described the said Invention as communicated to me by my_
foreign correspondents and the manner of performing the same I wish it understood
that I claim :-
First A padlock consisting of the shell A, the hasp F, the locking dog A³, the
sliding tumbler carrier 04, the tumbler X, the tumbler springs O₁, the safety
guard A, the fence E³, the tumbler carrier cover 0³, the locking devices, the
numeral plates E', the pawl bearing lever A³, the pawls G, the spring dogs E, and
the registering devices, all constructed and arranged to operate in relation to each
other substantially as described.
Second in a padlock, the combination with the shell, the hasp, and the locking
dog, of the sliding tumbler carrier 0%, the tumbler carrier cover 03 and the
tumblers X constructed substantially as described.
.
Third In a padlock, the combination with the shell, the hasp, the locking dog,
the tumbler carrier 04, the tumblers X and the tumbler carrier cover 0³, of the
safety guard A7, and the fence E³ constructed substantially as described.
Fourth A registering device for padlocks and other purposes, enclosed in a
suitable case or shell and consisting of a series of concentric, circular, numeral

page_text: bearing plates E', the pawls G, the spring dogs E' and the lever A°, in combination
with any suitable devices for actuating the said lever, substantially as described.
Fifth The shell of a padlock having an inner rim or shell M with a space N
between the two, substantially as, and for the purpose, described.
In Witness whereof I the said William Robert Lake have hereunto set my
hand and seal this twentieth day of March in the year of our Lord
One thousand eight hundred and eighty three.
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