A Key-bolt for Preventing the Picking of Locks.
Year: 1897

page_text: A Key-bolt for Preventing the Picking of Locks.
JOSEPH RICHARD PARKER, 447, High Road, Willesden, London, in the County
of Middlesex, Photographic Accessory Maker, do hereby declare the nature of this
invention to be as follows:-
This invention relates to a device for preventing the unlocking of doors from
the outside, either by picking the lock or by turning the key
The device consists of a key, with a bolt, which slides through a hole on the head
of the key, parallel with the key-shank, and enters the key-hole when the key is
turned in an horizontal position in the lock. In this position it is impossible for
either the key to be turned, or the lock in any way picked from the outside.
The device consists of a bolt, so adapted as to be free to slide into a sloat, formed
on one side of the key-head. When the key is in the lock, and not turned, the
bolt is not in action. It is then suspended by the hooked shaped end of the bolt
from the resting har, across and under the sloat in which the bolt slides.
When the door is locked, the key is turned inside the lock to an horizontal
position, and lying under the fore part of the lock. The bolt is then pushed
forward through the sloat and parallel with the key-shank, until it enters the
key-hole. Having the forward end of the bolt turned under, and hooked shaped,
it blocks the part of the key-hole under the key-shank. When the hooked shaped
end of the bolt is in the key-hole, and the key is lying across the inside of the
lock, the key and the key-bolt will be at right angles.
"The key-bolt is kept in position by means of a small tightening screw, which
works through a tapped hole in the key-head; immediately over and above the
sloat through which the bolt slides; the end of the screw being received into a
notch in the bolt. By this means the key is held in an horizontal position in the
lock, by the bolt. It is then impossible to turn the key, or in any way to pick the
lock from the opposite side to which the device is applied.
1
1000
A Key-bolt for Preventing the Picking of Locks.
I, JOSEPH RICHARD PARKER. of 447, High Road, Willesden, London, N.W.,
Photographic Accessory Maker, 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 a device for preventing the unlocking of doors from
the outside, either by picking the lock or by turning the key.

page_text: a notch or recess, and a screw which is passed through the head of the key, and
adapted to operate in said notch or recess, substantially as shown and described.
2. A key comprising the usual shaft, and provided at one end with a key-head,
and at the opposite end with a knob or head, said knob or head being provided at
one side with a longitudinal passage which ranges parallel with the shaft of the
key, and a key bolt or rod which is provided at one end with a hook, and at the
opposite end with an oblong head in which is formed a notch or recess, said knob
or head of the key being also provided with a set screw which is adapted to operate
in said notch or recess, substantially as shown and described.
3. A key the shaft of which is provided with a knob or head, in which is a
longitudinal passage, and a sliding rod or bolt mounted in said passage, and
adapted to be locked therein, one end of said sliding rod or bolt being adapted to
enter the key hole of a lock, when the key is inserted therein and turned,
substantially as shown and described.
Dated this 14th dow of Wahunane 1908
JOSEPH RICHARD PARKER,
447, High Road, Willesden, London, N.W.