Improvements in or Appertaining to the Construction of Locks.
Year: 1889

page_text: Date of Application, 30th Mar., 1889
Complete Specification Left, 27th Dec., 1889-Accepted, 1st Feb., 1890
PROVISIONAL SPECIFICATION.
Improvements in or Appertaining to the Construction of Locks.
We, JOHN EGBERT ELGOOD, RICHARD HARRIS ELGOOD, and THOMAS SCOTT
ELGOOD, trading as Elgood Bros. of Market Street, and Peacock Lane, Leicester,
Locksmiths, do hereby declare the nature of this invention to be as follows:-
This invention has reference to locks, specially applicable for asylums, hospitals,
and other public institutions and consists in the provision of certain improvements
to the internal mechanism or working parts of such locks by which their movements
may be readily controlled, and by which the noise incidental to the working of a
lock may be considerably lessened if not altogether obviated.
According to this invention the bolt may be placed in the upper part of the case
and be actuated by means of a suitable follower worked by the door knob spindle.
The upper end of the said follower engages with a recess in the bolt and the lower
end or tail of the follower may be controlled by a suitable force-bolt or equivalent
which may be actuated by means of a key.
The tail of the follower is preferably constructed in such a manner that it possesses
two working edges each of which in certain positions of the bolt, is adapted to be in
contact with the edge of the force-bolt and consequently held in control by the
latter, the force-bolt being adapted to be locked one or more times as may be
desirable.
We may arrange the various parts of the lock so that the bolt is capable of being
shot or thrown out only by the door-knob and spindle actuating the follower which
may be in contact with the bolt or other communicating part, but for unlocking the
key must be employed.
The bolt and other parts of the internal mechanism may be prevented from shaking
about and be rendered comparatively noiseless in their action by the employment
of a spring, anti-friction rollers or equivalents or by working in contact with pads
or buffers of leather, india-rubber or other material capable of deadoning the
sound.
We distinctly reserve to ourselves however the right to make any proper modifica-
tion or departure from the structural details as above set forth.
Dated this 30th day of March 1889
W. P. THOMPSON & BOULT,
Agents.
COMPLETE SPECIFICATION.
Improvements in or Appertaining to the Construction of Locks.
We, JOHN EGBERT ELGOOD, RICHARD HARRIS ELGOOD, and THOMAS SCOTT
ELGOOD, trading as Elgood Brothers of Market Street and Peacock Lane Leicester
Locksmiths 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 reference to locks, specially applicable for Asylums, Hospitals
and other public institutions, and consists in the provision of certain improvements
to the internal mechanism or working parts of such locks by which their movements
may be readily controlled.
"
The invention will be understood from the following description in reference to
the accompanying drawings in which Fig. 1 is an elevation of a lock, with the
front.plate removed, shewing the internal mechanism and our improvements applied
thereto.

page_text: Fig. 2 is a similar view of a modification.
The bolt A is placed preferably in the upper part of the lock and is actuated by
the follower B B₁ receiving its motion from the knob on a spindle passing
through D.
The upper part B of the follower is furnished with an anti-friction roller such as
described in the specification of our patent No. 16427 of 1887 and enters a recess A¹
in the bolt A.
The lower part or tail B₁ of the follower is provided with two working edges B'
and B³ which when in contact with either the edge (or C₁ respectively of the
force, sliding or control-bolt C are held in control by the latter, which may work in
conjunction with a lever E constructed so as to permit of being locked one, two or
more times according as different persons (or officers of varying degrees in the case
of an asylum) or different keys are to be separately used before the bolt A can be
completely withdrawn or shot outwards.
The bolt A can be locked either in or out, but with this difference; that when the
bolt is locked in, the force bolt can then only bé locked once; but when the bolt
is shot out, the force-bolt can be locked one, two, or more times according to the
'construction of the lever E or the requirements of the case.
When the bolt A is locked in its inward position the force-bolt C is moved by
means of the key until its edge C is in contact with the edge B³ of the follower B¹
as shown in Fig. 1; if it now be desired to lock the bolt in its outward position,
the force-bolt C must be moved towards the right in Fig. 1 by the key; the bolt A
can then be shot outwards by the knob on the spindle passing through D which will
bring the edge B2 parallel with C².
The force-bolt Cupon then being moved towards the left in Fig. 1 by the key, will
bring the edge C² underneath and in contact with the edge B and the bolt A will
then be incapable of further movement by the spindle passing through D until the
force-bolt C is again actuated and moved to the right in Fig. 1 clear of the tail B¹.
Any shaking or rattling of the bolt A is prevented by means of a spring F secured
at to the bolt A, and the free end of which bears against the side of the plate
which encloses the mechanism.
In Fig. 2 the bolt A. is shown capable of being moved outwards either by the key
or the spindle passing through D and actuating the follower B which being in
contact with the edge A¹ of the bolt A moves the latter forward; but the bolt A
can only be withdrawn by means of the key in the usual way.
As before described the bolt may be made to lock one, two, or more times as
circumstances require. A spring is provided as in Fig. 1 to prevent the bolts
shaking.
We reserve to ourselves the right to make any proper modification or departure
from the structural details above set forth.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. In a lock, the combination with the bolt A of a follower B. B¹ controlled by a
bolt such as C substantially as and for the purpose described and illustrated in Fig. 1
of the accompanying drawing.
2. The combination in a lock, of a bolt adapted to be moved outwards by either
the knob and spindle or by the key, and moved inwards by the key only, substantially
as described and illustrated in Fig. 2 of the accompanying drawing.
Du 1
1000
JOHN EGBERT ELGOOD.
RICHARD HARRIS ELGOOD.
THOS. SCOTT ELGOOD.
W. P. Thompson & Boult,
Agents for the Applicants.
JOHN EGBERT ELGOOD.
RICHARD HARRIS ELGOOD.
THOS. SCOTT ELGOOD.
W. P. Thompson & Boult,
Agents for the Applicants.