Year: 1894

page_text: Date of Application, 14th Apr., 1894-Accepted, 3rd Nov., 1894
Figs. 10 and 11 show different forms of the key used from outside,
Fig. 12 shows the manner of fastening the lock,
Fig. 13 shows the lock with cover removed, the outer key in position for turning,
and the key for inner use attached to a chain.
a is a lock casing formed of a plate with its sides bent inwards at right angles,
each side having a slot a³ for the passage of the lock bolt 6 located in said casing
so as to move to and fro in same and carrying two vertical pins c and d. A second
plate with its under edge bent inwards at right angles so as to form a bracket n and
with its upper edge r inclined outwardly and which plate carries two small pins 1,
is swivelled on to the sides of the lock casing by means of two small pins q and q' in
such way, that the under part of said plate i is free and can be raised and lowered.
within given limits. Said plate i has further a slot k for the free movement to and
fro of the pins c and d.
Figs. 6 to 9 show the form of tumblers used and which are laid or bedded on the
plate i in the order 1 to 4 or any other order desired. Attached to the under edge
of the tumblers is a forked spring t which is tnade to rest on the bracket edge n of
the plate i in such way, that the spring pressure forces the tumbler upwards and
locks the stop-pin d in one of the slots immediately said stop-pin has arrived at
the end of the horizontal slot s*. The tumblers are held in position at the
sides by the screw-pins and land are prevented from being pressed too far
upwards by the pins c and d.
m is the cover plate having its sides bent inwards at right angles so as to fit
between the sides of the lock casing and to which latter said cover plate is secured
by means of two small nuts screwed to the two pins and which project through
the cover plate in which two small holes are made for the purpose. The upper
edge of the cover plate m is formed into wings u and ' which are bent outwards
and these, together with the inclined upper edger of the plate i, serve as guides
for throwing the key in the proper position on the tumblers.
In the under bracket edge n of the plate i is a small slot p into which engages
a set screw o turning on a small screw pin a' firmly fastened to the lock casing.
If the lock is in the right position for the key, the latter catches vertically on to
the tumblers; when the set screw is turned, however, it raises the plate i and with
it the tumblers resting on same, giving the whole an angular position to the key, so
that the slots of the key-bit can no longer act on the respective tumblers; and in
011

page_text: this way the lock can be so manipulated from inside as to render any key from
outside useless.
My lock can be fixed on any door either by screws through the lock casing or in
any other suitable way and either above or below the existing key-hole which need
not necessarily be altered.
The key use is of the form shown in Figs. 10 and 11 and consists of two parts
or members pivoted together in the centre, the upper part slotted in the centre so
that the under part may fold in same.
The method of operating my lock is shown in Fig. 13.
The key is first unfolded and then thrust through the key-hole up to the raised
portion v. Hereupon the under part falls downwards and the end or key-bit is
guided by the wings u and u' and the inclined edge on the tumblers.
When the lock is fixed above the key-hole, the key is turned round after the
under part has fallen downwards, until said under part engages with the tumblers
above.
In order to ensure the key engaging with the tumblers in each case, I can modify
the form of the wings u and u¹, so that the key-bit cannot possibly get fast at the
outer side of them. When the key falls on the tumblers and by pressing down
same, releases the stop-pin d, the bolt 6 is carried forward by the key by means of
the latter engaging with the pin c and taking same along with it. To withdraw the
key, a backward turn is given to same.
Any number or form of tumblers can be used in my lock, a larger number making
of course the lock more complicated than a smaller number; and the special feature
of these tumblers is, that there is a double action, whereas, in the Chubb tumblers
hitherto employed, the lock can only be made to act on one side owing to one end
being pivoted on a fixed pivot and the other end under pressure of a spring.
The lock can be arranged on doors without handles, either above or below the
key-hole, without its action being influenced in any way.
In order to work the lock from inside, the slide-key y is placed either to the right
or left on the tumblers before the catch, and, on pressing down said tumblers,
releases said catch by side pressure with the bolt. The nose y¹ which slides on the
bracket serves as guide for properly inserting and placing the key y.
For adjusting the lock to the proper position above or below the key-hole in
accordance with the length of the key used I employ a small triangular plate R,
Fig. 12.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare what I
claim, is:
1. A safety bolt lock, which cannot be opened by skeleton or any other sort of
key, its special feature being, that it can be arranged above or below the key-hole,
and that it locks as well to the right as to the left, in consequence of peculiarly
formed and bedded tumblers, which move loosely up and down between two guide
pins (1) resting on forked springs arranged in the middle, and which are given
their correct normal position to the key by means of a set-screw (o), on which
depends the action of the key.
•
2. A folding outside key for the safety bolt lock described under No. 1, consisting
of two joint-like connected parts (v, w) of which the lower part (v) is collar-like
thickened (c) and provided with a bit (w) corresponding to the tumblers.,
3. For the safety bolt lock described under No. 1 a key for inside use and
formed of one piece and provided with a nose (y), as and for the purpose described.
4. For the safety bult lock described under No. 1 a three-cornered plate for fixing
the lock above or below the key-hole corresponding to the length of the key.