A Latch Lock or Fastening for Doors, and the like,
Year: 1898

page_text: Date of Application, 12th Mar., 1898
Complete Specification Left, 13th July, 1898--Accepted, 5th Nov., 1898
PROVISIONAL SPECIFICATION.
A Latch Lock or Fastening for Doors, and the like,
I, THEOPHILUS CRISWICK, of 3, Grove Road, Bridgend, in the County of
Glamorgan, Engineer, do hereby declare the nature of this invention to be as
follows:-
The latch can be arranged to allow of the catch piece being raised or depressed
for latching the door. The fulcrum on which it moves must be of circular shape.
An extension of the catch piece is to be carried on to the other side of the fulcrum.
If the catch piece is to lifted for the latching of the door then the part from
the fulcrum to end of catch is to be the heavier, but if to be depressed then the
other side from the fulcrum is to be so thus causing the catch piece in either
case to fall back into position by gravity.
In closing the door the catch would be lifted or depressed (as may be arranged)
by meeting with a slope on the part fastened to the door frame in the usual
manner if not done otherwise.
For opening the door when latched the end of the extension of the catch piece
carried on to the other side of the fulcrum is lifted or depressed (as may be
arranged) by a cam or other arrangement connected with knobs or handles in
the usual manner. The circular piece forming the fulcrum has a key arrange-
ment having the centre of the stein different from that of the circular fulcrum.
When being used as a latch the centre of the stem of key is between the centre
of the circular fulcrum and the catch piece, the reversal of these positions wil
produce locking, the catch piece and of course its extension on the other side of
the fulerem being thus moved forward beyond the action of the cam or other
arrangement connected with the knobs or handles. To unlock the door tho
circular fulcrum must be again turned to bring the centre of stem of key towards
the catch piece. In so doing the latching arrangement is made operative and
the door capable of being opened by the knobs or handles.
Dated th: Oh .. of Houck 1000
THEOPHILUS CRISWICK,
A Latch Lock or Fastening for Doors, and the like.
I, THEOPHILUS CRISWICK, of 3, Grove Road, Bridgend, in the County of
Glamorgan, Engineer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
The latch can be arranged to allow of the catch piece being raised or depressed
for latching the door. The fulerum on which it moves must be of circular shape.
An extension of the catch piece is to be carried on to the other side of the fulcrum.
r_..

page_text: If the catch piece is to be lifted for the latching of the door, then the part from
the fulcrum to end of catch piece is to be the heavier, but if to be depressed then
the other side from the fulcrum is to be so, thus causing the catch piece in either
case to fall back into position by gravity.
In closing the door the catch would be lifted or depressed (as may be arranged)
by meeting with a slope on the part fastened to door frame in the usual manner
if not done otherwise."
For opening the door when latched the end of the extension of the catch piece
carried on to the other side of the fulcrum is lifted or depressed (as may be
arranged) by a can or other arrangement connected with knobs or handles in
the usual manner. The drawing herewith the latch is shewn to be depressed; the
inner end being lifted by means of the cam marked A, which is a part of the
piece through which the spindle connected with the handles (or knobs) passes.
The part marked D which is also a part of the same piece meets with the stop E,
and prevents the cam being turned. too far.
The circular piece marked B forming the fulcrum has a key arrangement
having the the centre of the stem different from that of the circular fulcrum.
The motion of the circular fulcrum being around the centre of the key an
eccentric movement is given thereto, the catch piece of latch and lock being moved
thereby.
When being used as a latch the centre of the stem on key is between the circular
fulcrum and the catch piece as shewn by full lines on drawing the reversal of
these positions as shewn by dotted lines will produce locking, the catch piece and
its extension on the other side of the fulcrum being thus moved forward as shewn
by lines C beyond the action of the cum or other arrangement connected with
the knobs or handles.
To unlock the door the circular fulcrum must be again turned to bring the
centre of stem of key towards the catch piece. In so doing the latching arrange-
ment is made operative, and the doors capable of being opened by the knobs or
handles. Safety appliances either by way of having wards to the key or other-
wise can be adopted but these would be analogous to such in general use.
Having now 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 :-
(1) The arrangement of a latch lock in which the locking removes the catch
from being moved by the knobs or handles as described without the use of springs
or any arrangement other than gravity.
Dated this 1st day of June 1898.