IMPROVEMENTS IN DOOR AND OTHER LATCHES
Year: 1886

page_text: Date of Application, 9th Nov.; 1886.
Complete Left, 8th Aug., 1887. .
Complete Accepted, 9th Sept., 1887.
1 ARTHUR CHARLES HENDERSON of 46, Southampton Buildings, Holborn in the
county of Middlesex, and 31, Lincoln Place, Leinster Street, Dublin, Patent Agent do
hereby declare the nature of the said invention for "IMPROVEMENTS IN DOOR AND
OTHER LATCHES," to be as follows:-
The case of the latch is of metal of an elongated form, the centre being of square or
other shape, in the upper and lower portions of the case are two springs, the upper
one works the bolt which is in the centre of the square portion of the case (by shooting
it forward after the handle is released) whilst the spring in the lower part acts on a
spring driver, in whose centre as well as through the case, the shaft of the handle
passes.
On drawing in the bolt by turning the handle the long arm of the spring (in the
upper part of the case) which is connected to the bolt, is drawn backwards, at the same
time and with the same movement of the handle the spring driver draws the long arm
of the spring in the lower portion of the case forward.
When the handle is released the bolt is shot outwards.
The springs employed may be formed of a number of blades, they may be arched or
straight and of one or several pieces.

page_text: 1 ARTHUR CHARLES HENDERSON of 46 Southampton Buildings Holborn in the
county of Middlesex, and 31 Lincoln Place Leinster Street, Dublin, Patent Agent do
bereby declare the nature of the said invention for "IMPROVEMENTS IN DOOR AND
OTHER LATCHES" and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement, a communication to me
from abroad by André Gobron of the city of Paris in the Republic of France,
Merchant :-
The case of the latch is of metal of an elongated form, the centre g, being of square
or other shape, these parts may be of a single piece or of many pieces if deemed
requisite in the upper and lower portions of the case are two springs c. d. the upper
one d, works the bolt a which is in the centre or square part of the case, whilst the
spring e, in the lower part acts on a spring driver, in whose centre as well as through
the case, the shaft of the handle passes. The latch is worked either by lever handle or
ordinary door knob, and is right or left handed.
Fig. 1 of the drawings, shows the inside of the case, and the mechanism of the
latch a is the bolt. b the spring driver, in the centre of which is a square hole for
the shaft of the handle, or knob : c is the spring acted on by the piece b: d, the
spring working the bolt. e. e are the pins supporting the springs, c. d.
Fig. 2 is a front external view of the latch.
Fig. 3 is the staple.
ffare the two elongated portions or spring boxes. 9 is the square or other shaped
centre. Fig. 4 represents a straight spring which can be used in lieu of the bent
ones.
From the foregoing description therefore it will be remarked that the novel latch
the subject of this invention although described as being furnished with two spring
boxes of a certain form and a square centre, still such parts may vary in formation
from square to round or other convenient shape suitable for containing the parts of
the latch effecting its mechanical action, without departing from the principle of
construction.

page_text: The springs c. d. may be of a number of blades and straight, bent or otherwise
shaped, and occupy any position provided they effect the purposes of their employ-
ment.
Having now particularly discribed 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
A latch consisting of two elongated parts f. for spring boxes with square or other
shaped centre g. containing the bolt a, spring actuating piece b. and springs c and d
the whole as and for the purposes herein set forth.