MENTS IN LOCKS AND LATCHES AND FURNITURE FOR THE SAME
Year: 1884

page_text: I WILLIAM ADAMS PEIRCE of Oak Bank House Woolstone in the County of
Hampshire, Saddler do hereby declare the nature of my invention for IMPROVE
MENTS IN LOCKS AND LATCHES AND FURNITURE FOR THE SAME to be as follows:-
In place of the ordinary horizontal bolt or latch I use a bolt or latch working on
a pivot which I call a pendulum-latch-bolt which in locks requiring handles is
intended to serve the double-purpose of latch and bolt. At the back of this
pendulum latch bolt I provide a lever as a counterpoise to the bolt which lever'
serves to withdraw the bolt and is also intended to secure the plates provided to
hold the bolt locked. With the above I use an improved form of handle secured
direct on the boss of the trigger which serves to raise the lever and I also use an
improved form of rim to the handle. In some cases the back lever may be dispenced
with, and the pendulum latch bolt withdrawn by pressure from above in front of
the fulcrum.
The accompanying drawing further illustrates the nature of my invention.
Figure 1. Side view of a door lock, locked, with side removed to shew workings.
A. A. A. Lock case. B. B. B. Swing or pendulum latch bolt. B¹ Lever to ditto.
C. C. Pivots on which the bolt and locking plates work. D. and E locking plates
F. Trigger F¹ Trigger boss.
Figure 2. Section of handles and lock shewing the neck of the handle secured
direct on the boss of the trigger.
A. A. Lock case F1 F1 Trigger boss H. H. Handles. G Spindle I. I. I. I.
Rims formed of cylinders passing within the thickness of the door.
of door.
J. J. Portion
I wish it to be understood that I do not confine myself to the precise details
shewn in the drawing nor to any particular description or form of lock:

page_text: I WILLIAM ADAMS PEIRCE of Oak Bank House Woolstone in the County of
Hampshire Saddler do hereby declare the nature of my invention for IMPROVE-
MENTS IN LOCKS AND LATCHES AND FURNITURE FOR THE SAME and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
The working parts of the lock or latch are enclosed in a suitable metal frame or
box of any desired form. In place of the ordinary horozontal bolt or latch I use a
bolt or latch working on a pivot which I call a rocking or pendulum latch bolt.
For the purpose of locking this bolt or latch I provide side and rear plates of
any desirable form and number which plates also work on a pivot and are so
placed that when the rocking or pendulum bolt has been thrown forward by the
action of the key these pivoted locking plates falling in behind one or more
projections placed on the side, or back, or both, of the rocking bolt hold it locked.
To prevent the fraudulent removal of the rear pivoted locking plates, and
unlocking of the rocking bolt except by means of the proper key, I provide a lever,
which I call a catch-lever, working with the rocking bolt which catch lever is so
placed that in order to unlock the rocking bolt the whole of the rear pivoted
locking plates must be raised at the same time. In the event of a picklock or
false key being introduced for the purpose of raising the pivoted locking plates,
the effect of raising any less number than the whole of the rear locking plates,
would be, to force the upper-part, or edge, of the plates so raised, against the lower
end of the catch lever, and the catch lever working on the pivot on which it swings
would in turn force back the bolt on to the remaning, or unraised locking plates
and so prevent their removal. The projections on the rocking bolt are slightly
´undercut so that the locking plates shall engage in them more securely. For the
purpose of additional security I provide on the rocking bolt one or more overthrow
catches which in the event of the corresponding locking plate being raised too high
would engage with it and so prevent the withdrawall of the rocking bolt.
In locks requiring handles a beveled portion of the rocking or pendulum latch
bolt is allowed to project beyond the front plate of the lock case and may be
withdrawn either by the handle acting on a lever behind the pivot, on which the
bolt is suspended or works, or by pressure from above in front of the pivot, or by
means of the key raising the rear pivoted locking plates and so forcing up the
catch lever and withdrawing the bolt.
For the purpose of preventing the accidental locking of the rocking or pendulum
latch bolt I provide one or more catches on the rocking bolt, which catches,
engaging with corresponding books provided on the pivoted locking plates, hold it
secure on the latch.
This invention further relates to the attachment of the handles to the lock, and
this I accomplish by forming the rims or roses of the handles of cylinders passing
within the thickness of the door, and also by lengthening the neck of the bandles

page_text: so as to secure them direct on the boss of the trigger, thereby preventing the
rocking of the spindle and consequent wear and working loose of the trigger and
rims and also avoiding the necessity of especial adjustment to the thickness of
different doors. The strain or pull being direct on the lock, and the handles being
well supported by the cylinders, both the rims and handles are less liable to work
loose than is the case where the strain is on the rims.
I connect the handles in the following manner.
The lock having been fixed to the door, one of the cylindrical rims is fitted, and
the spindle and corresponding fixed handle passed through it to the opposite side
of the door, the other rim is then passed on to the neck of the other handle and
this handle passed on to the spindle and connected to it by means of a pin or
screw passing through the handle and spindle at right angles to their axis as shewn
in the drawing. The pin or screw having been fixed, the rim is then drawn
forward and fixed to the door so as to cover the pin or screw and prevent the
possibility of its working loose and dropping out.
To make my 'invention better understood I will now describe the same by
reference to the accompanying drawings Figure 1. is a side view of a door lock,
not locked, with the side plate removed to shew workings A. A. A. Lock case.
B. B. B. Rocking or pendulum latch bolt. B Catch lever for securing the rear
pivoted locking plates. C. C. Pivots on which the bolt and locking plates work.
D Side locking-plate. E. Rear ditto F. Trigger F1 Trigger boss. Figure 2. is a
section of handle and lock shewing the neck of the handle secured direct on the
boss of the trigger, and the handle secured to the spindle by means of the screw or
pin covered by the cylindrical rim passing within the thickness of the door.
A. A. Lock case. G. Spindle. I. I Cylindrical rim J. J. J. Portions of door
K. Screw or pin. F¹ F¹ Trigger boss.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
Firstly. The use in the construction of locks of pivoted locking plates for the
purpose of locking a pendulum latch bolt substantialy as herein described.
Secondly. The use in the construction of locks of a catch lever working with a
rocking or pendulum latch bolt to prevent the fraudulent removal of the pivoted
locking plates.
Thirdly. The connection of the neck of the handles direct on the trigger boss as
shewn in the drawing.
Fourthly. The use of rims formed of cylinders passing within the thickness of
the door for the reception of the neck of the handles, and used also to secure the
connecting pin or screw in the manner herein described.
Fifthly. The use and construction of a lock with or without springs, with the
combination of rocking or pendulum latch bolt, catch lever, and pivoted locking
plates as described.