Improvements in Locks, and Keys therefor.
Year: 1895

page_text: Date of Application, 20th July, 1895
Complete Specification Left, 20th Apr., 1896-Accepted, 23rd May, 1896
PROVISIONAL SPECIFICATION.
Improvements in Locks, and Keys therefor.
I GEORGE HENERY HODGES SHAPTER of 37 Gunner Street, Landport,
Portsmouth in the County of Hampshire, Shipwright do hereby declare the nature
of this invection to be as follows:-
:-
The object of this invention is to enable the keyhole of a lock to be made
shorter than the bit of the key of such lock in order that ordinary keys or pick-
locks inserted in the said lock may not reach the tumblers or the lock bolt
sufficiently to open or close the lock.
The key is made with a pivoted or hinged bit and on the lock plate near to the
pin on which the barrel of the key fits, or any other means for guiding and
centering the key, is fitted an inclined or bevelled nose against which the bit of the
key will strike when the key is inserted in the lock in order to push the bit outward
from the barrel of the key into its operative position.
When the key is withdrawn the back of the bit strikes the edge of the keyhole
in the lock cover plate and is thus folded inwards again to permit withdrawal of
the key.
Dated this 20th day of July 1895.
HERBERT HADDAN & Co.,
Agents to Applicant.
Improvements in Locks, and Keys therefor.
I, GEORGE HENRY HODGES SHAPTER of 37, Gunner Street, Landport,
Portsmouth, in the County of Hampshire, Shipwright, 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 :-
The object of this invention is to enable the key hole of a lock to be made
shorter than the bit of the key of such lock in order that ordinary keys or pick
locks inserted in the said lock may not reach the tumblers or the lock bolt
sufficiently to open or close the lock.
The key is made with a pivoted or hinged bit and on the lock plate near to the
pin on which the barrel of the key fits, or any other means for guiding or
centering the key, is fitted an inclined or bevelled nose or cam against which the
bit of the key will strike when the key is inserted and turned in the lock in order
to push the bit outward from the barrel of the key into its operative position.
When the key is withdrawn the back of the bit strikes the edge of the key hole
in the lock cover plate and is thus folded inwards again to permit withdrawal of
the key.
Fig. 1 is a front
Fig. 2 is a cross
This invention is illustrated in the annexed drawing in which
elevation of the interior of the lock with cover plate removed.
section on line 2-2 Fig. 1. Fig. 3 shows the key.
The latter is made with a barrel a having on it a lug b and
with two lugs e e. A pin passes through lugs 6 and e and secures the bit to the
the bit c is made

page_text: lug so that the former can be moved into the position shown in full lines or into
that shown in dotted lines in Fig. 3. In the end of the bit c is a slot g and the end
of the bit may be rounded or bevelled as at h.
The lock contains a cam ; concentric with the pin k on which the barrel a of the
key fits. This cam is not a continuous circle but sufficient is cut away to enable
the key to be inserted so that when the latter is turned the bit meets the end of the
cam and is turned outwards so that its end meets and raises the tumbler / and
moves the bolt m in the usual way. The plate n attached to the tumbler / forms
both a ward and a guide, and enters the slot 9 in the end of the bit of the key.
o is a loose slit cylinder which turns with the key. At its inner end is a bevelled
bridges which commences the outward throw of the bit of the key. The hole p
in the front plate 9 through which the key passes is sufficient in length to receive
the key when the bit is folded inwards. When the key is withdrawn the bevelled
part at the end of the key hole p brings the bit of the key into this position
again.
Having now particularly described and ascertained the nature of this said
invention and in what manner the same is to be performed I declare that what
I claim is :-
The construction of key with folding bit and lock having the cam arranged for
throwing outward said bit in order to bring it into its operative position in the
manner set forth.
Dated this 20th day of April 1896.
.
HERBERT HADDAN & Co.,
18, Buckingham Street, Strand, London, W.C., Agents for Applicant.
HERBERT HADDAN & Co.,
18, Buckingham Street, Strand, London, W.C., Agents for Applicant.