An Improved Combination Night Latch.
Year: 1891

page_text: Date of Application, 28th Feb., 1891-Accepted, 4th Apr., 1891
COMPLETE SPECIFICATION.
An Improved Combination Night Latch.
We, GEORGE EDWARD WOOTTON, of the Firm of Wootton Brothers &
Radford, of Newton Street, Birmingham, in the County of Warwick, Merchants,
and JoHN RUSHBURY, of Burnside Buildings, Gaiscube Road, Glasgow, in the
County of Lanark, Locksmith, do hereby declare the nature of our said invention,
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:
:-
Our invention has for its object: an improved locked-lever combination night-
latch which gives very great security against any attempts to lift the latches by the
introduction of any instrument from the outside of the door and thus increases the
security of doors when left upon the latch.
In order that our invention may be clearly understood and more easily carried
into practical effect, we have appended hereunto a double sized sheet of drawings
upon which we have illustrated that part of the latch which has reference to our
present invention and from which others acquainted with the construction of such
latches will be able to apply the principle to other shapes.
Figure 1, is an elevation of the inside of one of our latches after removing the
back or inner plate from the casing A. and showing the inner or working parts in
their normal condition as when the door is open or shut.
Figure 2, is a similar elevation to Figure 1 but with the internal parts in the
position they would occupy when the door is nearly shut and just when parts of the
staple S have operated upon the bolt E and latch B sufficiently to make them
ready to spring into position when the door is entirely closed.
Figure 3, is an elevation of part of the internal mechanism of the lock when the
combination latch portion B has been removed so that the back locking mechanism
may be more clearly seen.
Figure 4, is a side elevation of the staple S which is fastened on to the door
post.
Figure 5, is a front elevation of the staple and Figure 6, is a plan of the staple.
Figure 7, is a view of the top portion of the locking bolt E.
Figure 8, shows the key used for this particular lock.
Our improved lock lever combination night latches may be operated on the
inside of the door by a handle connected with the lifting portion M, m³ & m² or
by the key from the outside of the door which is of course the case with night
latches now in use such for instance as T. H. Radford's Patent night latch
No. 1447 A.D. 1889.
On reference to the drawings it will be noticed that we make in the upper
portion of the combination latch B a notch band that the sliding bolt E has
a spur or heel piece el which in Figure 1 is in such a position over the solid
portion of the latch B that the latch could not be lifted until the bolt E is moved
along to the position as shewn in Figure 2 that is to say over the notch which
unlocks the latches B and allows them to lift out of the nose & of the staple S. It
will thus be seen that the application of a knife or tool under the latches between
the door and the door post cannot succeed in lifting them. The bolt E must first
The sliding of the bolt E is accom-
be slided into the position shewn by Figure 2.
plished from the inside of the door by the handle operating the lever m' against the
portion of the sliding plate K which carries a notch Kinto which the part e¹ of
the bolt E takes, and the bolt E is thus carried along by the plate K upon turning
the handle inside the door. The other projection m lifts the la ches B as usual.
The key W accomplishes the same result from the outside of the door by the
point w' operating against the slide K at until the latches B are unlocked when

page_text: the other portion of the key acts upon the latches or levers B in the usual manner.
It will of course be evident that modifications may be made in the parts without
departing from the principle such, for instance as the cutting away the nose of the
bolt E which would be operated in guides inside the lock by the spring lever V and
spring just as effectively in locking the latches B as if the point were there.
We, however, prefer to retain the point of the bolt E as it; operates against the
parts of the staple S and allows the door to shut with a push without touching the
handle or key whereas without it the key must be applied from the outside or the
handle operated inside to even shut the door.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, I declare that what
I claim is: :-
.First The improved locked-lever combination night latch, having the bolt E
acting upon the latch B and operated either by the staple S or the key W or the
knob or handle inside the door: substantially as and for the purpose herein set
forth and as shewn upon, the drawings.
Second: In lever conibination latches the lever bolt E or its equivalent working
inside the lock and operated by the key or handle: substantially as herein set
forth.
Dated this 27th day of February 1891.
GEORGE BARKER,
77, Colmore Row, Birmingham, Agent for Applicants.