IMPROVEMENTS IN LOCKS AND LATCHES, AND IN THE MEANS OF ADJUSTING AND FIXING KNOBS OR HANDLES ON THE SPINDLES."
Year: 1877

page_text: LETTERS PATENT to Charles George Virgo, Gentleman, Bradford, and Benjamin
Hammond Richardson, Land Agent, Leeds, both in the County of York, for the
Invention of "IMPROVEMENTS IN LOCKS AND LATCHES, AND IN THE MEANS OF
ADJUSTING AND FIXING KNOBS OR HANDLES ON THE SPINDLES."
PROVISIONAL SPECIFICATION left by the said Charles George Virgo and
Benjamin Hammond Richardson at the Office of the Comissioners of Patents on
the 25th April 1877.
CHARLES GEORGE VIRGO, Gentleman, Bradford, and BENJAMIN HAMMOND
"IMPROVEMENTS
RICHARDSON, Land Agent, Leeds, both in the County of York.
IN LOCKS AND LATCHES, AND IN THE MEANS OF ADJUSTING AND FIXING KNOBS.
OR HANDLES ON THE SPINDLES."
The first part of our Invention consists of improvements in what is technically
termed the "latch action" of locks and latches, by which the bolt or catch of the
lock or latch is regulated to give more or less catch in the box, staple, or striking
plate, ensuring an easy shutting of the door. For this purpose we make the latch.
bolt spindle with a projecting piece, against which is fitted a sliding plate having a.
check pin fixed therein; this pin is made to slide in openings cut in the front plate.
of the lock or latch; these openings are made up and down to allow the check pin
to be slid in any of the openings, bringing the latch bolt more or less in the lock,
allowing more or less of the latch bolt to pass out of the lock or latch.
The regulating of the latch bolt is effected by means of a small knob fitted on the
check pin, which is fitted outside the face plate of the lock or latch, and the latch
bolt is kept firmly in position by the end of the check pin being made square and to
fit the openings cut in the front plate of the lock or latch.
For mortise locks or latches we fit a pin in the latch bolt spindle, on which presses'
a lever having a slot hole at the bottom end, and working on a pivot fixed to the
plate of the lock or latch. In the slot hole works a pin fitted to a plate made to

page_text: slide, and fitted under the latch bolt spindle; this plate is actuated by a screwed
stud, the front end of which is passed through suitable openings in the front end
plate of the lock or latch. The stud is recessed and made with a screw head, and
when required is actuated by a screwdriver to turn the screwed stud, and bring
the sliding part forward or move it backwards, bringing the latch bolt more or less
out of the lock or latch.
The second part of our Invention consists of improved arrangements for adjusting
and fixing knobs or handles on the spindles of locks or latches in a simpler and more
effectual manner than by the ordinary arrangements. For this purpose we form or
cut the female screw, in which works the screwed angles of a square spindle, with
four slot holes, cutting away the screwed part of the female screw, and allowing
room for the screwed angles to be easily passed through. When the required posi-
tion of the spindle is obtained,. by giving a slight turn the screwed angles are fixed
in the screwed parts left of the female screw, and the knobs or handles adjusted on
the spindle. This plan of cutting away portions of the female screw is applicable to
any kind of lock or latch having square spindles with screwed angles.
To keep the knob or handle firmly secured on the spindle we drill or form two
holes in the flange of the socket or in the knob end or handle. The holes are made
sligtly taper, in which are fitted lynch pins or screws; these pins or screws press
against two of the sides of the square spindle, preventing the spindle moving out of
position.
Or we employ a split spindle, and when adjusted in position we pass a lynch pin
or screw through the knob or handle, and through the split opening. The pin or
screw passes slightly through the knob or handle, and is covered by a hollow ring
made with recesses to pass over the projecting parts of the pin or screw, and then
turned over and fixed in position.
We also construct lock furniture with an ordinary square spindle, one end of
which may be permanently fixed into one knob, and the other end having screw
threads formed on the angles to screw into the other knob. The screwed part of
the spindle is passed in a socket having a female screw; over this socket is screwed
a flanged socket, screwing in opposite directions to the spindle. By screwing in
position the spindle, and screwing up the collar, the knob is firmly fixed on the
spindle.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Charles George Virgo and Benjamin Hammond Richardson in the
Great Seal Patent Office on the 24th October 1877.
"
CHARLES GEORGE VIRGO, Gentleman, Bradford, and BENJAMIN HAMMOND
IMPROVEMENTS
RICHARDSON, Land Agent, Leeds, both in the County of York.
IN LOCKS AND LATCHES, AND IN THE MEANS OF ADJUSTING AND FIXING KNOBS
OB HANDLES ON THE SPINDLES."
The first part of our said Invention consists of improvements in what is technically
termed the "latch action" of locks and latches, by which the bolt or catch of the
lock or latch is regulated to give more or less catch in the box, staple, or striking
plate, ensuring an easy shutting of the door. For this purpose we make the latch
bolt spindle with a projecting piece, against which is fitted a sliding plate having a
check pin fixed therein; this pin is made to slide in openings cut in the side plate
of the lock or latch; these openings are made up and down to allow of the check
pin to be slided in any of the openings, bringing the latch bolt more or less in the
lock, allowing more or less of the latch bolt to pass out of the lock or latch.
The regulating of the latch bolt is effected by means of a small knob fitted on the

page_text: check pin, which is fitted outside the face plate of the lock or latch, and the latch
bolt is kept firmly in position by the end of the check pin being made square and to
fit the openings cut in the front plate of the lock or latch.
Or we fit in a lock or latch a sliding plate cut with a screwed opening, in which
works a screw formed with a screw head and recessed collar, which is fitted in posi-
tion by being passed through an opening cut in the front end plate of the lock,
leaving the head free to turn round in the face plate of the lock. The latch bolt is
made with a recess in which works a lever, which is actuated by the sliding plate
being screwed in or cut by the screw, allowing more or less of the latch bolt to pass
out of the lock or latch, regulating the catch bolt.
Or we make the sliding plate with a lever working in the recess made in the
latch bolt. In the sliding plate works a screw formed with recessed collar, and
fitted in the front plate of the lock. The end of the screw is turned smaller in dia-
meter than the screw, and works in a plate fixed in the lock. The sliding plate
works between guide pins fitted in the lock.
Or we fit in a lock or latch a latch bolt spindle with a projecting shoulder, against
which acts the bottom end of a sliding plate; through the side of this plate works a
screw having a screw head and recessed collar. The end of the screw is turned
smaller in diameter than the screw, and works in a recessed opening formed in a
pillar fitted in the lock. The top of the sliding plate is made with a projecting
piece, which slides over the top of the pillar, guiding the slide. By screwing or
unscrewing the screw, the sliding plate is made to move forward or backward, and
regulates more or less the play of the latch bolt of the lock or latch.
The second part of our Invention consists of improved arrangements for adjusting
and fixing knobs or handles on the spindles of locks or latches in a simpler and more
effectual manner than by the ordinary arrangements. For this purpose we form or
cut the female screw, in which works the screwed angles of a square spindle, with
four slot holes, cutting away the screwed part of the female screw, and allowing
room for the screwed angles to be easily passed through. When the required posi-
tion of the spindle is obtained, by giving a slight turn the screwed angles are fixed
in the screwed parts left of the female screw, and the knob or handle adjusted on
the spindle. This plan of cutting away portions of the female screw is applicable
to any kind of lock, latch, or turn-buckle having square spindles with screwed
angles.
To keep the knob or handle firmly secured on the spindle we drill or form two
holes in the flange of the socket or in the knob end or handle. The holes are made
slightly taper, in which are fitted lynch pins or screws; these pins or screws press
against two of the sides of the square spindle, preventing the spindle moving out of
position.
Or we employ a split spindle, and when adjusted in position we pass a lynch pin
or screw through the knob or handle, and through the split opening. The pin or
screw passes slightly through the knob or handle, and is covered by a hollow ring
or rose made with recesses to pass over the projecting parts of the pin or screw, and
then turned over and fixed in position.
We also construct lock furniture with an ordinary square spindle, one end of
which may be permanently fixed into one knob, and the other end having screw
threads formed on the angles to screw into the other knob. The screwed part of
the spindle is passed in a socket having a female screw; over this socket is screwed
a flanged socket, screwing in opposite directions to the spindle. By screwing in
position the spindle, and screwing up the collar, the knob is firmly fixed on the
spindle.
But in order to enable our improvements to be better understood we will proceed
to more particularly describe the same by reference to the accompanying Drawing,
in which,-
Figure 1 represents part of the inside of a lock with lock bol tregulator; Figure 2,
ton view of same

page_text: regulator.
Figure 4, front plate of the lock with opening to admit screw collar; and Figure 5,
face plate of the lock.
Figure 6 represents a side view of the sliding plate action for a lock bolt
regulator.
Figure 7 represents a side view of a lock with plate removed, shewing another
sliding plate action for a lock bolt regulator.
Figure 8, front view of a screw cut with slot holes to allow of passing square
spindles having screwed angles.
Figure 9 represents the method of fixing a spindle with lynch pins.
Figure 10 represents a side elevation of a lock spindle to which the knob is
secured by a pin or screw passed into a split spindle.
Figure 11, hollow ring or rose to pass over the pin or screw.
Figure 12 represents the method of fixing a spindle with a lynch pin passed
through one of the openings cut in the spindle.
Figure 13 represents a side elevation of a turn-buckle fitted on a square spindle
cut with screwed angles.
Figure 14, front view of the turn-buckle.
Figure 15 represents a section of a knob fixed to the latch spindle of a lock by
right and left handed screwing.
Similar letters of reference are used in all the Figures to represent similar parts.
In Figures 1 and 2 of the Drawing the latch bolt spindle A is made with a pro-
jecting piece B, against which is fitted a sliding plate C, having a check pin D; this
pin can be slided in openings E cut in the side plate of the lock or latch; the pin
can be slided in any of the openings E, bringing the sliding plate C and latch
bolt F more or less in the lock, allowing more or less of the bolt to pass out of the
lock or latch. The bolt is regulated by the knob G, fitted on the screwed pin of
the check pin D. The latch bolt is kept firmly in position by the square end H,
which fits the openings E.
In Figures 3, 4, and we fit in the lock a sliding plate I, cut with a screw in
which works a screw J, having a recessed collar K and screw head L, in which is
formed a slot to allow of a screwdriver being used to turn the screw and actuate the
sliding plate. The collar K is passed through an opening M formed or cut in the front
end plate N of the lock. The screw is prevented moving out of position by the
face plate O, in which is cut an opening fitting over the screw head. The sliding
plate I actuates a lever P fixed on a pin Q fitted inside the lock. The bottom end
of the lever works in a recess R formed in the latch bolt F. By screwing or
unscrewing the screw J, the sliding plate I is brought forward or backwards in the
lock, bringing the latch bolt F more or less out of the lock, regulating the play of
the latch bolt.
Or we make the sliding plate I (Figuro 6) with a lever S, which works in the
recess R. The end of the screw J is made smaller than the screw, and works in a
plate T fitted in the lock. Guide pins U are fitted in the lock, on which works the
sliding plate I, guiding it.
In Figure 7 the latch bolt spindle A is made with a shoulder V, against which
acts the bottom end W of a sliding plate I; through this plate works a screw J,
having a recessed collar K and screw head L. On the screw is formed a washer X,
which allows of fitting strong screws with large heads and collars. The turned-
down end Y works in a recess formed in the pillar Z fitted in the lock; over this
pillar works the projecting piece A¹ of the sliding plate I, guiding it. The screw J,
being turned to the right or to the left, actuates the sliding plate, bringing the
bottom end W forward or backward, actuating the latch bolt F, allowing more or
'less of the bolt to pass out of the lock, regulating the latch bolt's play.
Figure 8 represents the device for allowing room for the screwed angles of a

page_text: spindle to be easily passed through the socket or flange of a knob or handle or
female screw B¹ cut therein; this screw is made with four slot holes C¹, formed by
cutting away parts of the screw, allowing room for the screwed angles of a square
spindle to be easily passed through; and when the required position of the spindle
is obtained, by giving a slight turn the screwed angles are fixed in the screwed parts
left of the female screw B¹.
In Figure 9 the moveable knob is firmly secured on the spindle by two lynch
pins D¹ or screws, which are passed into slightly taper holes drilled in the flange or
socket of the knob or handle. The pins or screws press against two sides of a
square spindle E, preventing the spindle moving out of position. Over the
spindle pins or screws is fitted a hollow ring or rose, made to cover the pins or
screws.
In Figures 10 and 11 the moveable knob is firmly secured on the spindle by
means of a lynch pin D¹ or screw passed through the knob or handle, and through a
split spindle F¹. The pin D or screw passes slightly through the flange or
socket G of the knob H¹, which is made to fit in a recess formed in a rose I. Over
the flange or socket is fitted a hollow ring J', which is made with openings K' to
allow the passing of the ring over the pin or screw; the ring is then turned over the
pin and fixed in position.
Figure 12 represents a moveable knob secured to the spindle by having two of the
angles of a square spindle cut with openings L¹. When the spindle is fitted in
position, a tapered pin M¹ is passed through a long socket G¹, formed on the
knob Hand through one of the openings L', keeping the knob firmly secured in
position. Over the socket is fitted a rose or washer I'. The knob on the opposite
end is fastened in the usual manner.
Figures 13 and 14 represent a turn-buckle N¹ fitted on a square spindle E¹ cut
with screwed angles. The socket O' of the turn-buckle is formed with a female
screw, having four slot holes C' cut out of the screw to easily pass the turn-buckle
over the spindle. The turn-buckle when fixed in position is slightly turned over
the screwed parts of the square spindle, and kept firmly fixed by a wedge P¹
passed in the socket of the turn-buckle, and in one of the grooves or depressions Q¹
of the spindle.
Figure 15 represents the fixing of a moveable knob in position on the spindle by
means of right and left handed screwing. The square spindle E¹ is made with
screwed angles, the screws being cut right handed, which screws in a flanged
socket R¹, which is cut on the top with a left-hand screw; over this screw is screwed
a socket S¹, made with a flange T₁, to which is secured the knob H¹. The socket S¹
is cut with four openings, in which pass the angles of a socket U³, having a square
hole through which passes the spindle to the inside recess V₁ made in the knob.
The knob is secured in position on the spindle by screwing the spindle and knob to
the right and left hand. A washer W₁ is fitted between the flange of the socket R¹
and a rose I¹.
Having thus described our improvements and the best means we are acquainted
with for carrying the same into effect, we would have it understood that we do not
confine ourselves to the precise details shewn and described, as they may be varied
without departing from the peculiar character of the Invention, but what we do
claim is,―
Firstly. The method or means of regulating the latch, bolt, or catch of locks or
latches, giving more or less catch in the box, staple, or striking plate, ensuring an
easy shutting of the door, substantially as herein-before described and illustrated in
the accompanying Drawing.
Secondly. The cutting four slot holes in the female screw, in which are passed the
screwed angles of a square spindle, and whereby the spindle is fixed in the screwed
parts which are left in the screw by giving a slight turn, substantially as described
and represented in the accompanying Drawing.
Thirdly. The modes of securing the knobs or handles of locks or latches on the

page_text: lock spindles, also of securing turn-buckles on the spindles, substantially as herein-
before described and represented in the accompanying Drawing.
In witness whereof, I, the said Charles George Virgo, for and on behalf of
myself and the said Benjamin Hammond Richardson, have hereunto set my
hand and seal, this Twenty-third day of October, in the year of our Lord 5
One thousand eight hundred and seventy-geven.
Witness,
WALTER JAMES TURNER, C.E.,
Patent Agent,
Bradford.
CHARLES GEORGE VIRGO. (LS)

page_text: LETTERS PATENT to Charles George Virgo, Gentleman, Bradford, and Benjamin
Hammond Richardson, Land Agent, Leeds, both in the County of York, for the
Invention of "IMPROVEMENTS IN LOCKS AND LATCHES, AND IN THE MEANS OF
ADJUSTING AND FIXING KNOBS OR HANDLES ON THE SPINDLES."
Sealed the 13th October 1877, and dated the 25th April 1877.
PROVISIONAL SPECIFICATION left by the said Charles George Virgo and
Benjamin Hammond Richardson at the Office of the Comissioners of Patents on
the 25th April 1877.
CHARLES GEORGE VIRGO, Gentleman, Bradford, and BENJAMIN HAMMOND
"IMPROVEMENTS
RICHARDSON, Land Agent, Leeds, both in the County of York.
IN LOCKS AND LATCHES, AND IN THE MEANS OF ADJUSTING AND FIXING KNOBS
OR HANDLES ON THE SPINDLES."
The first part of our Invention consists of improvements in what is technically
termed the "latch action" of locks and latches, by which the bolt or catch of the
lock or latch is regulated to give more or less catch in the box, staple, or striking
plate, ensuring an easy shutting of the door. For this purpose we make the latch
bolt spindle with a projecting piece, against which is fitted a sliding plate having a
check pin fixed therein; this pin is made to slide in openings cut in the front plate
of the lock or latch; these openings are made up and down to allow the check pin
to be slid in any of the openings, bringing the latch bolt more or less in the lock,
allowing more or less of the latch bolt to pass out of the lock or latch.
The regulating of the latch bolt is effected by means of a small knob fitted on the
check pin, which is fitted outside the face plate of the lock or latch, and the latch
bolt is kept firmly in position by the end of the check pin being made square and to
fit the openings cut in the front plate of the lock or latch.
For mortise locks or latches we fit a pin in the latch bolt spindle, on which presses
a lever having a slot hole at the bottom end, and working on a pivot fixed to the
plate of the lock or latch. In the slot hole works a pin fitted to a plate made to

page_text: slide, and fitted under the latch bolt spindle; this plate is actuated by a screwed
stud, the front end of which is passed through suitable openings in the front end
plate of the lock or latch. The stud is recessed and made with a screw head, and
when required is actuated by a screwdriver to turn the screwed stud, and bring
the sliding part forward or move it backwards, bringing the latch bolt more or less
out of the lock or latch.
The second part of our Invention consists of improved arrangements for adjusting
and fixing knobs or handles on the spindles of locks or latches in a simpler and more
effectual manner than by the ordinary arrangements. For this purpose we form or
cut the female screw, in which works the screwed angles of a square spindle, with
four slot holes, cutting away the screwed part of the female screw,
and allowing
room for the screwed angles to be easily passed through. When the required posi-
tion of the spindle is obtained, by giving a slight turn the screwed angles are fixed
in the screwed parts left of the female screw, and the knobs or handles adjusted on
the spindle. This plan of cutting away portions of the female screw is applicable to
any kind of lock or latch having square spindles with screwed angles.
To keep the knob or handle firmly secured on the spindle we drill or form two
holes in the flange of the socket or in the knob end of handle. The holes are made
sligtly taper, in which are fitted lynch pins or screws; these pins or screws press
against two of the sides of the square spindle, preventing the spindle moving out of
position.
Or we employ a split spindle, and when adjusted in position we pass a lynch pin
or screw through the knob or handle, and through the split opening. The pin or
screw passes slightly through the knob or handle, and is covered by a hollow ring
made with recesses to pass over the projecting parts of the pin or screw, and then
turned over and fixed in position.
We also construct lock furniture with an ordinary square spindle, one end of
which may be permanently fixed into one knob, and the other end having screw
threads formed on the angles to screw into the other knob. The screwed part of
the spindle is passed in a socket having a female screw; over this socket is screwed
a flanged socket, screwing in opposite directions to the spindle. By screwing in
position the spindle, and screwing up the collar, the knob is firmly fixed on the
spindle.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Charles George Virgo and Benjamin Hammond Richardson in the
Great Seal Patent Office on the 24th October 1877.
CHARLES GEORGE VIRGO, Gentleman, Bradford, and BENJAMIN HAMMOND
RICHARDSON, Land Agent, Leeds, both in the County of York. "IMPROVEMENTS
IN LOCKS AND LATCHES, AND IN THE MEANS OF ADJUSTING AND FIXING KNOBS
OR HANDLES ON THE SPINDLES."
The first part of our said Invention consists of improvements in what is technically
termed the latch action" of locks and latches, by which the bolt or catch of the
lock or latch is regulated to give more or less catch in the box, staple, or striking
plate, ensuring an easy shutting of the door. For this purpose we make the latch
bolt spindle with a projecting piece, against which is fitted a sliding plate having a
check pin fixed therein; this pin is made to slide in openings cut in the side plate
of the lock or latch; these openings are made up and down to allow of the check
pin to be slided in any of the openings, bringing the latch holt more or less in the
lock, allowing more or less of the latch bolt to pass out of the lock or latch.
The regulating of the latch bolt is effected by means of a small knob fitted on the

page_text: check pin, which is fitted outside the face plate of the lock or latch, and the latch
bolt is kept firmly in position by the end of the check pin being made square and to
fit the openings cut in the front plate of the lock or latch.
Or we fit in a lock or latch a sliding plate cut with a screwed opening, in which
works a screw formed with a screw head and recessed collar, which is fitted in posi-
tion by being passed through an opening cut in the front end plate of the lock,
leaving the head free to turn round in the face plate of the lock. The latch bolt is
made with a recess in which works a lever, which is actuated by the sliding plate
being screwed in or cut by the screw, allowing more or less of the latch bolt to pass
out of the lock or latch, regulating the catch bolt.
Or we make the sliding plate with a lever working in the recess made in the
latch bolt. In the aliding plate works a screw formed with a recessed collar, and
fitted in the front plate of the lock. The end of the screw is turned smaller in dia-
meter than the screw, and works in a plate fixed in the lock. The sliding plate
works between guide pins fitted in the lock.
Or we fit in a lock or latch a latch bolt spindle with a projecting shoulder, against
which acts the bottom end of a sliding plate; through the side of this plate works a
screw having a screw head and recessed collar. The end of the screw is turned
smaller in diameter than the screw, and works in a recessed opening formed in a
pillar fitted in the lock. The top of the sliding plate is made with a projecting
piece, which slides over the top of the pillar, guiding the slide. By screwing or
unscrewing the screw, the sliding plate is made to move forward or backward, and
regulates more or less the play of the latch bolt of the lock or latch.
The second part of our Invention consists of improved arrangements for adjusting
and fixing knobs or handles on the spindles of locks or latches in a simpler and more
effectual manner than by the ordinary arrangements. For this purpose we form or
cut the female screw, in which works the screwed angles of a square spindle, with
four slot holes, cutting away the screwed part of the female screw, and allowing
room for the screwed angles to be easily passed through. When the required posi-
tion of the spindle is obtained, by giving a slight turn the screwed angles are fixed
in the screwed parts left of the female screw, and the knob or handle adjusted on
the spindle. This plan of cutting away portions of the female screw is applicable
to any kind of lock, latch, or turn-buckle having square spindles with screwed
angles.
To keep the knob or handle firmly secured on the spindle we drill or form two
holes in the flange of the socket or in the knob end or handle. The holes are made
slightly taper, in which are fitted lynch pins or screws; these pins or screws press
against two of the sides of the square spindle, preventing the spindle moving out of
position.
Or we employ a split spindle, and when adjusted in position we pass a lynch pin
or screw through the knob or handle, and through the split opening. The pin or
screw passes slightly through the knob or handle, and is covered by a hollow ring
or rose made with recesses to pass over the projecting parts of the pin or screw, and
then turned over and fixed in position.
We also construct lock furniture with an ordinary square spindle, one end of
which may be permanently fixed into one knob, and the other end having screw
threads formed on the angles to screw into the other knob. The screwed part of
the spindle is passed in a socket having a female screw; over this socket is screwed
a flanged socket, screwing in opposite directions to the spindle. By screwing in
position the spindle, and screwing up the collar, the knob is firmly fixed on the
spindle.
But in order to enable our improvements to be better understood we will proceed
to more particularly describe the same by reference to the accompanying Drawing,
in which,-
Figure 1 represents part of the inside of a lock with lock bol tregulator; Figure 2,
top view of same.

page_text: Figure 3 represents the inside of a lock with song plate and lever LOCK DOID
regulator.
Figure 4, front plate of the lock with opening to admit screw collar; and Figure 5,
face plate of the lock.
Figure 6 represents a side view of the sliding plate action for a lock bolt
regulator.
Figure 7 represents a side view of a lock with plate removed, shewing another
sliding plate action for a lock bolt regulator.
Figure 8, front view of a screw cut with slot holes to allow of passing square
spindles having screwed angles.
Figure 9 represents the method of fixing a spindle with lynch pins.
Figure 10 represents a side elevation of a lock spindle to which the knob is
secured by a pin or screw passed into a split spindle.
Figure 11, hollow ring or rose to pass over the pin or screw.
Figure 12 represents the method of fixing a spindle with a lynch pin passed
through one of the openings cut in the spindle.
Figure 13 represents a side elevation of a turn-buckle fitted on a square spindle
cut with screwed angles.
Figure 14, front view of the turn-buckle.
Figure 15 represents a section of a knob fixed to the latch spindle of a lock by
right and left handed screwing.
Similar letters of reference are used in all the Figures to represent similar parts.
In Figures 1 and 2 of the Drawing the latch bolt spindle A is made with a pro-
jecting piece B, against which is fitted a sliding plate C, having a check pin D; this
pin can be slided in openings E cut in the side plate of the lock or latch; the pin
can be slided in any of the openings E, bringing the sliding plate C and latch
bolt F more or less in the lock, allowing more or less of the bolt to pass out of the
lock or latch. The bolt is regulated by the knob G, fitted on the screwed pin of
the check pin D. The latch bolt is kept firmly in position by the square end H,
which fits the openings E.
In Figures 3, 4, and 5 we fit in the lock a sliding plate I, cut with a screw in
which works a screw J, having a recessed collar K and screw head L, in which is
formed a slot to allow of a screwdriver being used to turn the screw and actuate the
sliding plate. The collar K is passed through an opening M formed or cut in the front
end plate N of the lock. The screw is prevented moving out of position by the
face plate O, in which is cut an opening fitting over the screw head. The sliding
plate I actuates a lever P fixed on a pin Q fitted inside the lock. The bottom end
of the lever works in a recess R formed in the latch bolt F. By screwing or
unscrewing the screw J, the sliding plate I is brought forward or backwards in the
lock, bringing the latch bolt F more or less out of the lock, regulating the play of
the latch bolt.
Or wo make the sliding plate I (Figure 6) with a lever S, which works in the
recess R. The end of the screw J is made smaller than the screw, and works in a
plate T fitted in the lock. Guide pins U are fitted in the lock, on which works the
sliding plate I, guiding it.
In Figure 7 the latch bolt spindle A is made with a shoulder V, against which
acts the bottom end W of a sliding plate I; through this plate works a screw J,
having a recessed collar K and screw head L. On the screw is formed a washer X,
which allows of fitting strong screws with large heads and collars. The turned-
down end Y works in a recess formed in the pillar Z fitted in the lock; over this
pillar works the projecting piece A¹ of the sliding plate I, guiding it. The screw J,
being turned to the right or to the left, actuates the sliding plate, bringing the
bottom end W forward or backward, actuating the latch bolt F, allowing more or
less of the bolt to pass out of the lock, regulating the latch bolt's play.
Figure 8 represents the device for allowing room for the screwed angles of a

page_text: spindle to be easily passed through the socket or flange of a knob or handle or
female screw B¹ cut therein; this screw is made with four slot holes C¹, formed by
cutting away parts of the screw, allowing room for the screwed angles of a square
spindle to be easily passed through; and when the required position of the spindle
is obtained, by giving a slight turn the screwed angles are fixed in the screwed parts
left of the female screw B¹.
In Figure 9 the moveable knob is firmly secured on the spindle by two lynch
pins D¹ or screws, which are passed into slightly taper holes drilled in the flange or
socket of the knob or handle. The pins or screws press against two sides of a
square spindle E¹, preventing the spindle moving out of position. Over the
spindle pins or screws is fitted a hollow ring or rose, made to cover the pins or
screws.
In Figures 10 and 11 the moveable knob is firmly secured on the spindle by
means of a lynch pin D¹ or screw passed through the knob or handle, and through a
split spindle F¹. The pin D or screw passes slightly through the flange or
socket G of the knob H, which is made to fit in a recess formed in a rose I¹. Over
the flange or socket is fitted a hollow ring J¹, which is made with openings K' to
allow the passing of the ring over the pin or screw; the ring is then turned over the
pin and fixed in position.
Figure 12 represents a moveable knob secured to the spindle by having two of the
angles of a square spindle cut with openings L'. When the spindle is fitted in
position, a tapered pin M¹ is passed through a long socket G₁, formed on the
knob H¹ and through one of the openings L, keeping the knob firmly secured in
position. Over the socket is fitted a rose or washer I. The knob on the opposite
end is fastened in the usual manner.
Figures 13 and 14 represent a turn-buckle N¹ fitted on a square spindle E¹ cut
with screwed angles. The socket O¹ of the turn-buckle is formed with a female
screw, having four slot holes C¹ cut out of the screw to easily pass the turn-buckle
over the spindle. The turn-buckle when fixed in position is slightly turned over
the screwed parts of the square spindle, and kept firmly fixed by a wedge P¹
passed in the socket of the turn-buckle, and in one of the grooves or depressions Q
of the spindle.
Figure 15 represents the fixing of a moveable knob in position on the spindle by
means of right and left handed screwing. The square spindle E¹ is made with
screwed angles, the screws being cut right handed, which screws in a flanged
socket R¹, which is cut on the top with a left-hand screw; over this screw is screwed
a socket S¹, made with a flange T¹, to which is secured the knob H. The socket S¹
is cut with four openings, in which pass the angles of a socket U¹, having a square
hole through which passes the spindle to the inside recess V¹ made in the knob.
The knob is secured in position on the spindle by screwing the spindle and knob to
the right and left hand. A washer W₁ is fitted between the flange of the socket R'
and a rose I¹.
Having thus described our improvements and the best means we are acquainted
with for carrying the same into effect, we would have it understood that we do not
confine ourselves to the precise details shewn and described, as they may be varied
without departing from the peculiar character of the Invention, but what we do
claim is,―
Firstly. The method or means of regulating the latch, bolt, or catch of locks or
latches, giving more or less catch in the box, staple, or striking plate, ensuring an
easy shutting of the door, substantially as herein-before described and illustrated in
the accompanying Drawing.
Secondly. The cutting four slot holes in the female screw, in which are passed the
screwed angles of a square spindle, and whereby the spindle is fixed in the screwed
parts which are left in the screw by giving a slight turn, substantially as described
and represented in the accompanying Drawing.
Thirdly. The modes of securing the knobs or handles of locks or latches on the

page_text: lock spindles, also of securing turn-buckles on the spindles, substantially as herein-
before described and represented in the accompanying Drawing.
In witness whereof, I, the said Charles George Virgo, for and on behalf of
myself and the said Benjamin Hammond Richardson, have hereunto set my
hand and seal, this Twenty-third day of October, in the year of our Lord
One thousand eight hundred and seventy-seven.
Witness,
WALTER JAMES TURNER, C.E.,
Patent Agent,
Bradford.
CHARLES GEORGE VIRGO. (LS)