AN. IMPROVEMENT IN SPRING DOOR LOCKS
Year: 1884

page_text: ERNEST WALTER BROWN of the Pheasantry Lower Fore Street Lower Edmonton
Middlesex Watch Maker do hereby declare the nature of my invention for AN.
IMPROVEMENT IN SPRING DOOR LOCKS to be as follows:-
This improvement consists of a spring attached to the back or side of the lock
frame and running alongside the bolt projects through the face plate in which a
hole is cut allowing the spring to move freely to and fro--On the end of the spring
nearest the face plate a piece of metal is fastened and opposite to it a hole is cut
through the bolt (it being drawn back flush with the face plate) in which the.
piece on the spring enters and keeps it there.
-
:
The striking plate on the door frame is arranged with a slot or otherwise to
allow the projecting end of spring to travel freely the requisite distance then;
detains it and thus frees the bolt. Doors with this improvement in their locks
would not require any slamming but merely to be drawn too, however gently and,
would instantly lock.

page_text: ERNEST WALTER BROWN of the Pheasantry Lower Fore Street Lower Edmonton
Middlesex Watchmaker do hereby declare the nature of my invention for
IMPROVEMENTS IN SPRING DOOR LOCKS and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
23.
This invention has for its object improvements in spring door locks-For this
purpose I use a retaining spring (A) one end of which is fastened to the back or
side of the lock frame (H), the other end projecting through a slot cut in the face
plate (G), in which it can move freely, towards and from the bolt, along the side
of which it runs, the spring always tending towards the bolt. On the spring, near
the face plate end, a retaining piece (B) is fixed, and in the bolt, a slot (F) is cut,
at such a distance, that when the bolt is drawn back, flush with the face plate by
the handle or key of the lock, the slot is opposite, and the spring having always
a tendency towards the bolt the retaining piece (B) enters, thus holding it
(unlocked).
The retaining piece (B) is a solid piece of metal, slightly undercut to allow it to
hold firmly, but sometimes I surmount it with a small elliptical piece (C) (Fig 3)
by filing the body of the metal away, leaving an arm at top and bottom, between
which the piece. works, it being pivoted through each arm; this causing less
friction, and consequent wearing at the edge of the slot in the bolt (E)..
*The striking plate (D) (Fig 2) is made flat in the ordinary way, but has a slot
cut in it opposite the bolt hole, and of such a depth, as to allow the end of
spring (A) projecting through the face plate of the lock to travel the required
distance; the bolt of the lock, not then being quite opposite the hole in the
striking plate, it must be pushed still farther, and the retaining spring (A), being
unable to travel any further, the retaining piece (B) is drawn from the bolt,
allowing it to lock.
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
1st The construction of spring locks having side retaining springs, retaining the
bolt when the door is open, and as the door is closed, liberated by the operation
of the striking plate, drawing the retaining piece out of the slot in the bolt,
substantially as herein described.
1
C
1708