IMPROVEMENTS IN RAILWAY CARRIAGE DOOR AND OTHER LOCKS OR FASTENINGS
Year: 1885

page_text: DIRCIFICATION,
We FELIX JONES and JOHN SLATER FOSTER both of 39 Bloomsbury Street
Birmingham in the County of Warwick Manufacturers do hereby declare the
nature of the said invention for "IMPROVEMENTS IN RAILWAY CARRIAGE DOOR AND
OTHER LOCKS OR FASTENINGS" and in what manner the same is to be performed
to be particularly described and ascertained in and by the following statement to
be as follows that is to say :-
This invention has for its object improvements in door locks for railway and other
carriages applicable also to other purposes by which great simplicity of construction
is obtained without danger of derangement of the various parts which are each in
themselves simple and substantial and easily renewed or exchanged without inter-
ference with the other remaining parts of the lock.
In order that our invention may be clearly understood and more easily carried
into practical effect we have appended hereunto a sheet of drawings upon which
Figure 1 is a view of the interior of one of our "Slam Locks" with the cover
plate removed and the bolt in its intermediate or unlocked position.
Figure 2 is the same as Figure 1 except that the bolt is now locked.
Figure 3 is a back and side view of the lever E itself.
Figure 4 is an end elevation of the lock.
Referring to Figures 1 and 4 the lock is seen in its normal condition i.e as a slam
Lock. It will be seen that the back end a¹ of the bolt A is now bearing against the
bolt spring b and the follower C is in such a position that the removable handle or
key D which is shown in dotted lines is inclined which is always an indication
that the lock is in its normal condition and not fully locked. While the lock
works as indicated by Figures 1 and 4 the lever E is not in action so that the
bolt A is perfectly free to slide inwards and outwards against the spring b which
always keeps the bolt up to its work when in its normal position.
Now referring to Figure 2 the bolt A is thrown by the key D into its locked
position and the line of the key is quite horrizontal as shown in dotted lines. The
locking lever is now in active use as the projecting nose piece k dotted in but
shown in full at Figure 3 has fallen into the recess m in the bolt A rendering it
quite impossible for the bolt to be shot back again unless the follower is operated
by the key To unlock the bolt and to bring it to its normal position the key is
turned to the left and the inclined edge c¹ of the follower C lifts the lever E into
Din A73

page_text: the position shown by Figure 1 where the lever is resting upon the, curved end c
of the follower C The spring n is used to keep the lever E down to its work
though it will be evident that the weight of the lever will make it act should the
spring be broken or injured.
It will be noticed that the spring b can be renewed very simply as it merely
drops into position behind the end projections p and r indeed every part both bolt
follower lever and springs may be taken out instantly and any part easily
exchanged or renewed.
Though we have only shown a lock specially suited to the door of a Railway
Carriage it will be readily seen that the principle is applicable to looks used in
various positions and for a variety of purposes besides Railway Carriages.
The form and general design of the lock may also be varied without departing
from the principle herein set forth.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that what
we claim is
The improvements in railway carriage door and other locks or fastenings of the
bolt A having the notch m into which the lever E locks when operated by the
follower C and key D acting in its normal condition as a "Slam Lock" and sub-
stantially as herein set forth and illustrated upon the accompaning drawings.
...
1
1 100K
GEORGE BARKER,
Agent for the Applicant,
77, Colmore Row, Birmingham.