A NEW AND IMPROVED LOCK FOR SLIDING DOORS
Year: 1855

page_text: LETTERS PATENT to Auguste Edouard Loradoux Bellford, of 32, Essex
Street, Strand, London, Patent Agent, for the Invention of "A NEW AND
IMPROVED LOCK FOR SLIDING DOORS."-A communication.
Sealed the 19th October 1855, and dated the 25th April 1855.
PROVISIONAL SPECIFICATION left by the said Auguste Edouard Loradoux
Bellford at the Office of the Commissioners of Patents, with his Petition,
on the 25th April 1855.
I, AUGUSTE EDOUARD LORADOUX BELLFORD, of 32, Essex Street, Strand,
London, Patent Agent, do hereby declare the nature of the said Invention for
"A NEW AND IMPROVED LOCK FOR SLIDING DOORS," a communication, to be as
follows, and consists in the combination of a catch and sliding bolt, arranged.
as will be hereafter described.
The casing of the lock may be of rectangular form, in which there is a
sliding bolt working on a stump, the said stump passing through a slot in the
bolt. Between the bolt and the casing there is a guard tumbler; one end of
this tumbler works on the said stump, and the opposite end is provided with a
projection, against the back side of which a pin on the bolt catches when the
bolt is thrown forward. There are two springs fixed on the casing, one of
which acts upon the bolt and the other upon the guard tumbler. Just below
the bolt there is a catch, the inner end of which works on a pivot; the outer
end passes through a slot or opening in the side of the casing, the said slot

page_text: being sufficiently long to allow the outer end of the sliding bolt to pass through.
To one side of the framing of the door there is secured a slotted bar, and a
mortise is made in the framing over which the bar is secured, the lower edge of
the slot in the bar being some distance above the lower edge of the mortise.
When the door is closed, the lower or inclined edge at the outer end of the
catch strikes against the lower edge of the slot in the bar, and the catch passes
through the slot, and is forced down over the lower edge of the said slot by the
spring, which acts both upon the bolt and catch. The key is then inserted in
the key-hole and turned, and the guard tumbler is first raised, so that the pro-
jection will be raised from the pin attached to the bolt; the key then throws
the outer end of the bolt through the slot in the bar, and the catch is thereby
prevented from being raised until the bar is thrown back. The catch is
operated upon by a knob in the usual manner.
SPECIFICATION in pursuance of the conditions of the Letters. Patent, filed
by the said Auguste Edouard Loradoux Bellford in the Great Seal Patent
Office on the 25th October 1855.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, AUGUSTE
EDOUARD LORADOUX BELLFORD, of 32, Essex Street, Strand, London, Patent
Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-fifth day of April, in the year of our Lord
One thousand eight hundred and fifty-five, in. the eighteenth year. of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Auguste Edouard Loradoux Bellford, Her special licence that I, the
said Auguste Edouard Loradoux Bellford, my executors, administrators, and:
assigns, or such others as I, the said Auguste Edouard Loradoux Bellford, my
executors, administrators, and assigns, should at any time agree with; and no
others, from time to time and at all times thereafter during: the term therein
expressed, should and lawfully might make, use, exercise, and -vend, within
the United Kingdom of Great Britain and Ireland, the Channel Islands, . and
Isle of Man, an Invention for "A NEW AND IMPROVED LOCK POR SLIDING DOORS,"
a communication, upon the condition (amongst others) that I; the said Auguste
Edouard Loradoux Bellford, by an instrument in writing under my hand.
and seal, should. particularly describe and ascertain the nature of the said.
Invention, and in what manner the same was to be performed, and cause the..

page_text: same to be filed in the Great Seal Patent Office within six calendar months
next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Auguste Edouard Loradoux Bellford,
do hereby declare the nature of the said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement, that is to say :-
1
This Invention relates to a new and improved lock for sliding doors, and
consists in the combination of a catch and sliding bolt, arranged as will be
hereafter shown and described in the accompanying Drawings.
Fig. 1 is a view of the interior of my improved lock, the side of the casing
nearest the eye being removed, and showing the lock in an unlocked state.
Fig. 2 is the same view as Fig. 1, with the exception that the parts are shewn
in two different positions. Similar letters of reference indicate corresponding
parts in the two Figs.
To enable others skilled in the art to fully understand and construct my
Invention, I will proceed to describe it..
A represents the casing of the lock, which may be of rectangular form; and
B is a sliding bolt, which works on a stump (a); said stump passing through
a slot (6) in the bolt. Between the bolt B and the casing there is a guard
tumbler C, shown by dotted lines in both Figs. One end of this guard, tumbler
works on the stump (a), and the opposite end is provided with a projection (c),
against the back side of which a pin (d) on the bolt catches when the bolt is
thrown forward, as will be hereafter shewn. D is a spring which acts upon the
bolt, and E is a spring which acts upon the guard tumbler. Just below
the bolt B there is a catch F, the inner end of which works on a pivot (e).
The outer end of the catch passes through a slot or opening (f) in the side of
the casing A, said slot being sufficiently long to allow the outer end of the bolt
B to pass through. To one side of the framing of the door there is secured a
slotted bar G (see Fig. 2), and a mortise (g) is made in the framing over which
the bar G is secured, the lower edge of the slot in the bar G being some
distance above the lower edge of the mortise (g).
When the door is closed, the lower or inclined edge at the outer end of the
catch strikes against the lower edge of the slot in the bar G, and the catch
passes through the slot, and is forced down over the lower edge of said slot
by the spring D, which acts both upon the bolt and catch. The key is then
inserted in the key-hole and turned, and the guard tumbler C is first raised, so
that the projection (c) will be raised from the pin (d) attached to the bolt. The
key then throws the outer end of the bolt through the slot in the bar G, and
the catch is thereby prevented from being raised until the bar is thrown back.

page_text: The catch F is operated by a knob in the usual manner. The lines thus
.-.-., Fig. 2, show the position of the parts when the lock is
in a locked state.
Having thus fully described the nature of the said Invention, and the manner
in which the same is to be performed, I wish it to be understood that I claim
neither the bolt B nor catch F seperately; but I claim the combination of the
bolt B and catch F, arranged substantially as shewn, and for the purpose
as set forth.
In witness whereof, I, the said Auguste Edouard Loradoux Bellford, have
hereunto set my hand and seal, this 23rd day of October, in the year
of our Lord One thousand eight hundred and fifty-five.
A. E. LORADOUX BELLFORD. (L.s.)