Improvements in Locks and in Keys therefor.
Year: 1895

page_text: Date of Application, 11th Nov., 1895-Accepted, 14th Dec., 1895
COMPLETE SPECIFICATION.
Improvements in Locks and in Keys therefor.
J, GIUSEPPE PICCIONI, of Montefiore dell' Aso (Ascoli-Piceno) in the
Kingdom of Italy, do hereby declare the nature of this invention and in what
mauner the same is to be performed, to be particularly described and-ascertained.
in and by the following statement :-
My invention relates to improvements in looks and in keys therefor, the object
being to provide a lock which is operated by a key from which it will be difficult
or impossible to obtain an impression in some pliable material as can readily be done
with the keys at present used.
In the accompanying drawings is represented one form of lock constructed
according to my invention such lock being shewn for the purpose of illustrating
one manner of carrying my invention into effect. In these drawings,
Fig. 1 is an elevation of a key for the improved lock.
Fig. 2 is a sectional olevation of same.
Fig. 3 is a cross section of the key on the line -y of Fig. 1. and
Fig. 4 is a sectional elevation of the lock.
The key Figs. 1, 2 and 3 is provided with a ring or handle aa shank b and a
cylindrical ende having a flared or conical opening e' which communicates, with a
series of annular grooves c having a series of projections therein so that they
present an eccentricior, undulating surface as shown in Fig. 3.
1
Any number of these grooves may be employed three being shown in the key
represented.
The part c is also provided on the outside with a projection d'.
of
The lock consists of a box portion i provided with a socket d for the key in the
interior of which is a groove to receive the projection d' of the key. The
bolt is retained in the box by a set screw ma slot in the bolt allowing it to move
to and fro. Projecting some distance into the sooket d is a male part e having a
solid head and an expanded base e" the latter being shaped to receive the flaring
part of the key. This part e may have a slot or slots or opening therein through
which project the heads fff of a series of levers fpivoted at the end
each lever engaging with a recess in the end of a tumbler y pivoted at g' there
being a tumbler to each lever. These tumblers are slotted as at g" the opening so
formed being eccentrically shaped or having the toothed edges shown. into this
opening passes a projection attached to the bolt such projection passing of
course through the opening in each of the tumblers g. The opening is so shaped
that the projection may pass along it without hindrance when the tumbler assumes
a certain position. The ends of each of the tumbler are provided with a spring
which bear against a fixed piece à and which act buth as springs for the tumblers
and for the levers f!.
It will be seen that upon inserting the key into the socket d the cylindrical
part c will fit over the part e and the projections in the annular grooves el will act
in turn as the key is turned upon the heads of the lever the projection d' of
the key which bas passed down the groove d" entering a slot or notch in the bolt
(which is not shown) and shooting same forward as the key is turned this movement
being permitted by reason of the action of the lovers which will operate the
ends of the tumblers g so that the projection. on the bolt is free to pass through
the open part of the slots g". It will be seen that the shape of the key renders
it impossible or difficult to take an impression of the interior grooves and undulations

page_text: which is the operating part of the key and that by reason of the heads yielding
when pressure is put upon them no satisfactory impression of the male part either
could be taken.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. An improved construction of lock and key in which a yielding male portion
is provided in the lock and a female portion in the key the interior of the latter
being provided with means for operating the yielding male portion of the lock
substantially as and for the purpose described.
3
2. A lock provided with a male portion having a yielding part or parts coutrolling
'tumblers which permit of the operating of the bolt and a key adapted to pass over
said imale part and when turned to operate the yielding part or parts of same
substantially as and for the purpose described.
3. A lock provided with a male part having the head of a lever or levers
'exposed therein, a tumbler or tumblers with which the end of such lever or levers
engages, an eccentrically shaped opening in said tumbler; a projection on the bolt
engaging with said opening, and means for operating such levers and means 'for
shooting the bolt substantially as described.
4. A key provided with a female part having a projection or projections recess
or recesses or eccentrically shaped annular groove or grooves therein and adapted
to operate the male portion of a lock having a yielding part or parts substantially
as and for the purpose described.
.
5. A key having a female part provided with an eccentrically shaped' annular
groove or grooves therein adapted to operate the male portion of a lock having a
yielding part or parts said key having also a flaring mouth portion and means for
operating a bolt substantially as described.
6. The improved constructions of lock and key substantially as described' and
illustrated in the drawings.
Dated this 11th N L 1005
PHILIP M. JUSTICE,
Chartered Patent Agent, London,
For the Applicant.