Improvements in Letter Boxes.
Year: 1892

page_text: Date of Application, 20th May, 1892
Complete Specification Left, 14th Feb., 1893-Accepted, 20th May, 1893
PROVISIONAL SPECIFICATION.
Improvements in Letter Boxes.
1, WALTER ERNEST HARRY of 42 Dymock Street Fulham in the County of
London, Boot and Shoe Maker do hereby declare the nature of my invention for
IMPROVEMENTS IN LETTER BOXES to be as follows:-
The object of my invention is to produce a letter box, (which can be either used
for post office or private purposes) from which it is utterly impossible to extract
letters, and thus prevent the letter-box robberies which so often happens from the
ordinary boxes now in use.
Although my letter box when fixed resembles in outward form the ordinary house
and office letter box now in use, in its internal structural arrangements it is totally
different to any other letter box yet known to the public.
My invention has four sides, two of which are external and two are internal.
Between each of the external and internal sides there is a space of one inch which
forms a chamber wherein works five levers. It has also two valves which become
horizontal immediately the flap of the letter plate is lifted to allow a letter to be
passed through the aperture.
The letter plate is so constructed that it sets all the levers in motion and they
being attached to the valves by spindles causes them (so long as the flap in letter
plate remains open) to form a platform or a double intermediate bottom to the box,
thereby rendering it utterly impossible for any letters to be extracted.
Immediately the flap in letter box is closed the valves drop to a perpendicular
form thus allowing all letters to fall to the bottom of the box.
Dated this 20th day of May 1892.
WALTER ERNEST HARRY.
COMPLETE SPECIFICATION.
Improvements in Letter Boxes.
I WALTER ERNEST HARRY of 42 Dymock Street Fulham S.W. in the County
of London, Boot and Shoe Maker, 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 :-
The object of my invention is to provide a letter box from which it is absolutely
impossible to extract letters post cards &c.
And to accomplish this I have constructed two" valves" or intermediate portable
bottoms which being acted upon by levers and spindles cut off all communication
with the well or bottom of the box immediately the flap of letter plate is opened.
The box has in addition to its two external sides two internal ones which are so
arranged as to form two secret chambers in cach of which work five levers which
determine the movements and position of the two "valves" as follows.
The horizontal portion of the front lever is fixed by bolts and nuts to the back of
flap of letter plate. Immediately said flap is raised to admit a letter &c. the
perpindicular sides of the front lever simultaneously act upon the remaining levers
and spindles the lattar of which being attached to the two valves causes them
instantly to take a horizontal position, but directly the flap is closed they again
become perpindicular, thus freely allowing all letters &c. to fall to the bottom of
the box.
(Figure 1) discloses the interior of secret chamber with one external side of box
removed. (a b c d e f g) shew position of levers and valves while flap of letter

page_text: plate remains closed. 1. 2. 3 and 4 are sections of spindles which when acted upon
by the levers determine the position of the valves.
(abcdefg) in Figure 2 describe the position of levers and valves while the flap
of letter plate remains open 1. 2. 3 and 4 are sections of spindles as shewn in
Figure 1.
(Figure 3) is the inside section of letter box. (h. i) are sections of flap of letter
plate and the motor lever. j is bearer upon which one of the sides of secret
chamber rests. (k. l. m) are slots in which spindles of levers work when acted upon
by movements of flap of letter plate.
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) A letter box containing two secret chambers in each of which are three