ating whether Apartments are Engaged, and like Purposes.
Year: 1885

page_text: DO ating whether Apartments are Engaged,
and like Purposes.
Alfred EdwarD BARRETT of 25 Clarendon Road Holland Park London W.
in the County of Middlesex Surgeon do hereby declare the nature of my inven-
tion for A DOOR BOLT FOR INDICATING WHETHER APARTMENTS ARE ENGAGED
AND LIKE PURPOSES, to be as follows:-
The indicator is itself a bolt or fastening working on the outside of the door to
which it is affixed and moved by a handle on the inside of the door. It is specially
adapted for consulting rooms bath rooms W.C's and other apartments where privacy
is desired and is. so arranged that those approaching the door may see at once
whether they may enter or not.
The Indicator is formed of a bolt inscribed with a word or words as engaged,
knock, come in and a plate so constructed as to provide a space for the bolt to slide
in and having holes through which the bolt may be seen and either a word or blank
spaces be exposed by the use of the handle inside.
The bolt may be inscribed with several words the different words being disclosed
by propelling the bolt to its full extent or stopping at certain points at the option
of the person using the handle.
My Indicator bolt is fastened on the outside of the door and only requires a small
hole through the door for the spindle or handle of the bolt to work in.
The bolt itself is the vehicle of the word words or inscriptions to be shewn.

page_text: COMPLETE SPECIFICATION.
A Door Bolt for Indicating whether Apartments are Engaged,
and like Purposes.
"
I, ALFRED EDWARD BARRETT, of 25, Clarendon Road, Holland Park, London, W.,
in the county of Middlesex, Surgeon, do hereby declare the nature of my invention
for A DOOR BOLT FOR INDICATING WHETHER APARTMENTS ARE ENGAGED, AND
LIKE PURPOSES" and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :--
This invention relates to the construction of a door bolt which also indicates
whether apartments are engaged and for like purposes, such for instance as a
cashier's or enquiry window in an office.
Referring to the accompanying drawings and to the figures and letters of reference
marked thereon.
Fig. 1 is an elevation of my invention as applied, say, to the outside of a door,
the bolt being shot back and indicating that the door may be opened.
Fig. 2 an elevation of same showing the bolt shot to fasten the door and
indicating that the apartment or the person or persons within is or are "engaged."
Fig. 3 is a transverse section on line.a-b of Fig. 1.
Fig. 4 is an elevation of a bolt inscribed for "knock" and "engaged."
Fig. 5 is an elevation of the inside of a door fitted with the apparatus in reference
to the bolt shewn in the last named figure.
A is the bolt (in Figs. 1, 2, and 3 arranged with the word "engaged" carried
thereby in any convenient manner, such as by engraving, printing, stamping,
pasting or carrying a label, &c).
This bolt A works in a frame, holder, or plate B secured to the door or other
object by screws or otherwise.
Perforations C are formed in this plate, in size and number corresponding to the
letters, figures, or signs to be shewn.
D is a hole or slot in the door or other object and E is a spindle, rod or bar
attached to the bolt A and passing through D.
F is a handle attached to E for the purpose of moving A.
I preferably place a slotted plate G on the inside of the door or like object for
the spindle, bar or rod E to work in.
H is the catch or plate for the bolt to shoot into on the door, window or like
frame or the bolt may be shot into a slot or hole in the door frame.
As shewn in Fig. 2, on shooting the bolt forward the door, window, etc., is
secured from the inside, and the word "engaged" displayed.. On shooting the
bolt back as in Figs. 1 and 3, the door, window, etc., is released and the previous
indication removed.
Fig. 4 shews a bolt inscribed for "engaged" and "knock," the former indication
being given by shooting the bolt to its full extent, the latter by partially shooting
the bolt.
As shewn in Fig. 5, I may attach a pointer to the handle F and may inscribe or
mark the slotted plate G with the positions necessary for the movement of the
handle F to give the various indications.

page_text: As shewn the pointer is moved to "K" and "knock" is displayed. Moving it
to "ED" will indicate "engaged" and secure the door, etc., and moving it to the
blank mark will release the bolt and indicate that the door etc., may be opened
from the outside.
In place of the handle F I might arrange rack teeth on the bolt and arrange
a pinion or segment or quadrant carrying teeth and moved by a suitable handle
to shift the bolt as will be well understood. And I may dispense with the plate
or catch H and use the bolt merely as an indicator fixed on the outside of the door
or other object and actuated from the inside as shewn.
I may inscribe my letters or indications on the bolt in luminous paint, for night
use or where the door or other object is situated in a darkened place or dull light..
Such indicating bolts are applicable for use in consulting rooms, bath rooms,
W.C's., or like places and any desired word, numeral or indication may be placed
thereon and the bolt may be so arranged as to give several indications.
The hole required to be made in the door or window to work the bolt is only
small and does not interfere with the strength of the same.
Of course "window" in this specification also refers to a flap or horizontal shutter
opening either by vertical or swinging movement.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that
what I claim is
1. The combination of a frame or plate B, furnished with slots or perforations C
of suitable form, and fixed or placed on the outside of a door, window, or the like,
with a bolt A sliding in such frame or plate, and moved from within the room or
behind a window, flap or partition; the said bolt being lettered, figured, or numbered
to itself form the indicator, substantially as described.
2. The combination of perforated or slotted frame B fixed outside the door,
window, or the like, bolt A sliding therein and itself forming an indicator, stem E
passing through slotted guide G to the interior of the room, window, or the like,
handle or knob F or its equivalent to actuate the bolt or indicator, and catch or
plate H, substantially as described.
3. A bolt lettered, marked, or figured to form an indicator and capable of being
shot backwards and forwards from the inside of a room, window or the like so as to
display indications through slots or perforations in a frame or plate on the outside
of a door, window, or the like, substantially as and for the purposes described.
Dated this 15th day of December 1885.