Improved Door Latch with Blocking Arrangement.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improved Door Latch with Blocking Arrangement.
THOMAS GRIFFITHS, 27, Margam Terrace, Port Talbot, Glamorganshire, Carpenter,
do hereby declare the nature of this invention to be as follows:-
The said latch consists of a semi-circular piece, one end having an aperture
for rivetting to guard plate which is fixed to door. The opposite end of semi-
circular piece, has a straight extended piece which forms the locking bolt. From
the outside of semi-circular piece is an extended tail-piece, the extreme end of
which works in a slot-plate attached to the door. The said latch is worked in an
ordinary manner, by a thumb lever, which releases the locking bolt from the
catch attached to the door frame. In closing the door, the straight extended piece,
which forms the said locking bolt, comes in contact with the bevelled portion of
catch-plate, which action drives the locking bolt until it falls into catch-slot.
The blocking attachment consists of a flat bolt having a slot, for the purpose of
allowing the said flat bolt to move to and fro, for blocking and opening said latch.
One end of said flat bolt is provided with small knob for purposes of handling.
November 16th 1897.
THOMAS GRIFFITHS.
THOMAS GRIFFITHS, 27, Margam Terrace, Port Talbot, Glamorganshire, Carpenter,
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 follow-
ing statement : —
My invention (Fig. 1) consists of a semicircular piece (A) the top end of which
has an apertund (B) for the purpose of rivetting same to the guard plate (C)
which latter is fixed to the door.
The bottom end of this said semicircular piece has a straight extended piece (D)
which forms the locking bolt. The outside of this semicircular piece has an
extended tail piece (X) the extreme end of which works in a slot plate attached
to the door.
The said latch is worked in an ordinary manner by means of a thumb-lever
which releases the locking bolt (D) from the catch attached to the door frame.
When closing the door the straight extended piece, which forms the said locking
bolt, comes in contact with the bevelled portion of the catch plate & this action
drives the locking bolt until it falls into the catch slot.

page_text: The blocking attachment of my invention consists of a flat bolt (E) having a
slot running along the centre for the purpose of allowing the said bolt to move
to and fro to enable blocking and opening the said latch.
One end of this bolt is provided with a small knob for the purpose of handling.
Features of this invention are its simplicity & efficiency of action.
Having now particularly described and ascertained the nature of my said in-
vention, & in what manner the same is to be performed, I declare that what I
claim is:-
I. That it maintains its efficiency & certainty of action even should the door
set, or drop.
II. That by using this latch the employment of bolts on doors can be dispensed
with, or, are unnecessary for the purpose of securing or locking same.
Dated this 27th dox of July 1808
THOMAS GRIFFITHS.