Year: 1886

page_text: Date of Application, 16th Feb., 1886.
Complete Left, 16th Dec., 1886.
Complete Accepted, 18th Jan., 1887.
I, ALEXANDER SCHANSCHIEFF of Gipsy Hill in the County of Surrey Electrician do
hereby declare the nature of this invention to be as follows:-
This invention has for its object improvements in locks and latches.
I provide an electro magnet and an armature within the case of a lock or latch.
The armature serves to block the main bolt of the lock or latch so that it cannot be
withdrawn until the armature has first been displaced.
Wires are led from the electro magnet to a distance where in any convenient place
a battery is provided and also an electric key by which the circuit may be closed.
The door or other part to which the look or latch is applied remains securely fastened
until the electric key is depressed and the battery circuit closed-when this is done the
door or part may be opened freely.
Sometimes also I provide the lock with a key by which the armature may also be
displaced mechanically when it is required to open the door or other part without the
aid of a battery.
CARPMAEL & Co.,
Agents for the Applicant.

page_text: UUMI LEIM DIMULTICATION.
Improvements in Locks and Latches.
I ALEXANDER SCHANSCHIEFF of Gipsy Hill in the County of Surrey Electrician 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 has for its object improvements in locks and latches.
I provide an electro magnet and an arinature within the case of a lock or latch.
The armature serves to block the main bolt of the lock or latch so that it cannot be
withdrawn until the armature has first been displaced.
Wires are led from the electro magnet to a distance where in any convenient place a
battery is provided and also an electric key by which the circuit may be closed. The
door or other part to which the lock or latch is applied remains securely fastened until
the electric key is depressed and the battery circuit closed-when this is done the door
or part may be opened freely.
Sometimes also I provide the lock with a key by which the armature may also be
displaced mechanically when it is required to open the door or other part without the
aid of a battery.
In order that my said invention may be fully understood and readily carried into
effect I will proceed to describe the drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is an elevation with the cover plate removed of a latch constructed in
accordance with my invention.
Figure 2 is a transverse section of the same on the line 1. 1. in Figure 1.
a is the case, b is the latch bolt and the spring which throws the bolt forward.
The nose of the bolt is bevelled at in the usual way so that the bolt may recede when
it comes against the striking plate in closing the door and then spring forward again
and engage to hold the door shut. d is a follower or part of cam like form and by
which the bolt is pressed back when the spindle is turned by means of the handle. The
part d has necks d¹ d' which fit into holes in the front and back plate of the lock or
Latch case.
A spindle of the ordinary square form passes through the necks d¹ by a
passage d of like form and knobs or handles are fixed on the spindle. e is an electro
magnet fixed within the lock case, it is constructed in the usual way and insulated
wires are led away from it to a battery. There is a press button in the battery circuit
which is closed only when the button is pressed upon. is the armature of the electro
magnet, it can turn about a fulcrum at fand is a light spring holding the armature
away from the poles of the magnet. When the armature is in this position it is in the
way of the bolt b and the bolt cannot be drawn back but when the battery circuit is
completed by pressure on the button the armature is drawn down out of the way and
the door can then be opened.

page_text: A key can be applied when desired to draw down the armature f independently. of
the electro magnet.
Sometimes arrange the electro magnet in connection with the striking plate on
the door post in place of within the lock case. I then form a notch in the top of the
latch bolt in the nose or part which projects and I provide on the armature of the
magnet a tooth or catch which drops into the notch when the door is closed.
The electro magnet when it attracts its armature lifts the catch and frees the latch
bolt.
There is also a spring in connection with the striking plate which when the door is
open lifts the armature and holds the catch out of the way but when the door is closed
the latch bolt presses back this spring and sets free the catch to engage with the recess
in the latch bolt.
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 is :-
1. The combination substantially as described with a lock or latch of an electro
magnet and armature in such manner that when the door is closed the main bolt is
blocked or held by the armature or a part in connection therewith and cannot be
withdrawn until the armature is attracted or drawn towards the poles of the magnet.
2. A lock or latch substantially as described and provided with an electro magnet
and an armature within the case; such armature serving to block the bolt of the lock
or latch so that it cannot be withdrawn until the armature has first been displaced by
the attraction of the electro magnet when a battery circuit is completed in which the
electro magnet is included.
3. A latch as represented by the drawings hereunto annexed.