CERTAIN LOCKS, SPRINGS,, AND MACHINERY FOR THE SECURITY OF DOORS, AND FOR PREVENTING RAIN OR WET FROM PASSING UNDER THEM, AND WHICH WHEN APPLIED TO THE DOORS OF ROOMS COVERED WITH CARPETS, FLOOR CLOTHS OR MATTING, WILL CAUSE. SUCH DOORS TO PASS OVER THE SAME WITH THE UTMOST FACILITY WITHOUT DRAGGING OR ANYWAYS INJURING OR DEFACING SUCH CARPETS, FLOOR CLOTHS OR MATTING, AND WHICH WILL ALSO PREVENT THE COLD AIR PROM PASSING UNDER AND OVER THE SAME, AND BY: THAT MEANS! KEEP SUCH ROOMS WARM
Year: 1797

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I; DANIEL
LANGTON, of Wandsworth, in the County' of Surry, Builder, send greeting.
WHEREAS His most Excellent Majesty King George the Third did, by
His Letters Patent under. the Great Seal. of Great Britain, bearing date
at Westminster, the Eighteenth day of November, in the thirty-eighth year.
of His reign, give and grant unto me, the said Daniel Langton, His especial
licence, full power, sole privilege and authority, that I, the said Daniel
Langton, my executors, administrators, and assigns, during the term of years
therein mentioned, should and lawfully might, use, exercise, and vend, within
England, Wales, and the Town of Berwick-upon-Tweed, my Invention of
"CERTAIN LOCKS, SPRINGS,, AND MACHINERY FOR THE SECURITY OF DOORS, AND FOR
PREVENTING RAIN OR WET FROM PASSING UNDER THEM, AND WHICH WHEN APPLIED TO
THE DOORS OF ROOMS COVERED WITH CARPETS, FLOOR CLOTHS OR MATTING, WILL CAUSE.
SUCH DOORS TO PASS OVER THE SAME WITH THE UTMOST FACILITY WITHOUT DRAGGING
OR ANYWAYS INJURING OR DEFACING SUCH CARPETS, FLOOR CLOTHS OR MATTING,
AND WHICH WILL ALSO PREVENT THE COLD AIR PROM PASSING UNDER AND OVER THE
SAME, AND BY: THAT MEANS! KEEP SUCH ROOMS WARM;" in which said Letters
Patent there is contained a proviso, obliging me, the said Daniel: Langton, by an
instrument in writing 'under my hand and seal, to cause a particular description
of the nature of 'my.said Invention, and in what manner the same is to be
performed, to be inrolled in His Majesty's High Court of Chancery within

page_text: one calendar month next and, immediately after the date of the said Letters
Patent, as in and by the same (relation being thereunto had) may more fully
appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
Daniel Langton, do hereby declare that my said Invention consists, first,
of several springs, levers, and additions to the common mortise lock for
internal doors, which may be made of any proper metal and of any con-
venient dimensions; likewise of a strong lever, and a case or box attached to
such lever, with a strong spring therein, made of any proper materials and of
any convenient dimensions, to be let into a groove at the bottom of the door to
which such mortice lock with its additions is affixed, and communicating
therewith by a small rod, in manner herein-after mentioned; also of a move-
able head, made of wood or metal, of any convenient size, to be placed on the
top of the door to which the above-mentioned apparatus is affixed.
The annexed Drawing No. 1, and the references thereto hereunder written,
will, it is presumed, fully explain the nature and use of this first part of my
said Invention, and the manner of performing the same.
a, the top spring bolt; b, staple for the said bolt to work in; c, spring which
works the said bolt; d, front view of the rack lever when fixed in the lock.
e, profile of the rack lever when out of the lock; f, plan of the lower end of
the socket of the rack lever, which fastens the rod i into the said socket by a
screw therein; g, the socket which is fastened to the lower end of the said
rack lever; h, screw which fastens the said socket and lever together; i, rod
which is fastened into the socket g by the screw k, which rod passes through a
hole bored perpendicularly up the front stile of the door, and draws up the
lever t, when the handle of the lock is turned by the hand that opens the door;
k, screw which fastens the rod i to the socket g; 1, bottom spring bolt of the
lock; m, staple for bottom spring bolt to work in; n, screw plate which covers
the wards or tumblers, as in common locks; o, rack tumbler, which the spindle
of the handle goes through; the under side of this tumbler works against the
spring ketches r, r. When the door is lifted up and opened, these ketches
work together in the middle, as shewn in the Drawing, the end of one of these
ketches goes against the end of the bottom of the spring bolt 7; when the door
shuts, the said bottom spring bolt works against a blank striking plate affixed
to the jamb of the door, forces the said spring ketches apart, and lets the door_
close down-to-the-floor. p, profile of the rack tumbler. when out of the lock;
9, a spring which keeps the bottom bolt / forwards in its place; r, r, spring
ketches; s, spring to keep the said ketches close to the tumbler; t, the lever,

page_text: which works in à groove made in the bottom of the door, and receives the
lower end of the rod i through a hole in the said lever; to which the said rod is
fastened by a nut screwed to the end thereof; v, the case, which is to be let:
into a groove or mortise in the bottom of the door directly over the lever t,
and there securely fixed by screws. This case contains withinside thereof a
strong spring, that works on the top of the lever t, and lets the door down
gradually to the floor, when it is shut too; u, a pin through the said case and
lever for the lever to work on; w, a plate let in and screwed to the floor for.
the said lever t to work on; a, the moveable head, placed over the top of the;
door, and lifted up thereby when the handle of the lock is turned by the hand. -
which opens the door; this head has a pin at each end working in a mortise
plate, as shewn by the Drawing, and when lifted up by the opening of the door
is received in a case made for that purpose at the back of the architrave of the
door. y, y, profile of the said moveable head and case.
It is necessary here to observe, that the lock and apparatus herein-before
described is adapted for internal doors only, and that such doors to which the
same is affixed must be hung with common lifting hinges, or with the hinges
herein-after described.
f
And I do hereby further declare, that the second part of my said Invention
consists of several additions to the mortise lock, commonly used for external
doors, and of a spring plate and other apparatus which may be fixed at the
bottom of external or internal doors, working in a case let into a groove in the
bottom of the door, communicating with and worked by such lock and its
additional works by means of a rod passing up a hole bored vertically up the
stile of the door, from the bottom apparatus to such lock, in the manner herein-
before described. The additions to the said last-mentioned lock and apparatus
may be made of iron, brass, or any other proper materials, and of any suitable
and convenient size or dimensions.
The Drawing hereunto annexed, No. II., and the several references thereto
hereunder written, will, it is presumed, sufficiently explain the nature and use
of this second part of my said Invention, and the manner of performing
the same.
1, top spring bolt; 2, staple for the said bolt; 3, spring which works the
said bolt; 4, front view of the rack lever when fixed in the lock; 5, profile of
5 the rack lever when out of the lock; 6, plan of the lower end of the rack lever
which fastens the rod 8 by a screw to the said lever; 7, the staple over the
rack lever with a hole therein to receive the top of the screw; 8, the rod which
fastens into the under side of the rack lever 4, and passes through a hole bored

page_text: perpendicularly up the front stile of the door, and draws or lifts up the spring
plate 16, when the handle of the lock is turned to open the door ;. 9, bottom
spring bolt of the lock; 10, staple for the spring bolt to work in; 11, screw
plate which covers the wards, as in common locks; 12; rack tumbler which
the spindle of the handle goes through the under side of this tumbler works
against the spring ketches 14, 14, 14141when the spring is lifted up by the
turning of the handle, the said spring ketches work together in the middle, as
shown in the figures 14, 14, 14, 14; the end of one of those ketches goes
against the end of the bottom of the spring bolt 9, when. the door shuts. The
said last-mentioned spring bolt works against a blank striking plate, fixed.to
the jamb of the door, forces the said ketches-apart, and lets the spring plate 16
down into a groove to be made in the floor to receive the same.directly under
the bottom of the door when shut too.. 13, a spring which. keeps the bottom
bolt 9 forwards in its place; 14, 14, 14, 14, the spring ketches; 15; spring.to
Keep the said ketches close to the tumbler. A, profile of the rack tumbler;
B, profile of the bottom spring ketch; 16, the spring plate, which falls into a
groove to be made in the floor, as above mentioned, or. upon the floor, at
pleasure; 17, 18, 19, the horizontal rod and rule joints, by nieans whereof and
the assistance of the perpendicular rod 8; the spring plate above mentioned is
raised or lifted up,, when the door is opened; 20, a spring which works on
the upper side of the plate 16, and forces the said.plate into the groove in the
floor; or down close to the floor, at pleasure.
.
It may be necessary to observe that the spring plate herein-before described
and all its apparatus is to be let or mortised into the bottom. or. lower edge of
the door, and will be quite hidden from the sight.
And I do hereby also further declare, that the third part of. my said Inven-
tion consists of certain apparatus that may be added to any mortise lock
already affixed to an internal door, or may be affixed on any such door without
being attached to 'the lock, and also of a certain spring plate to be affixed in
the bottom of such door to excludes the cold. air; this part of my said In-
vention may be also made of any convenient size or dimensions, and of any
proper materials.
The Drawing hereto annexed, No. III.,.and the references, thereto, herein
"next after mentioned, will, it is presumed, sufficiently.explain the nature and
use of this third part of my said Invention, and the manner of performing tlie.
same.
1;tumbler for, private bolt; 2, the said bolt,. which forces against a blank
striking plate affixed to the jamb' of the door, and forces the tongue lever 3, 3,

page_text: downwards, which lever communicates with the spring plate 8 (to be affixed!
in the bottom of the door) by the rod 12, which rod works in a hole. bored
vertically up the stile of the door, and fastens at the upper end thereof to the
said tongue lever, and at the lower end thereof to the spring plate. 8, and
thereby forces the said plate close down to the floor; 3, 3, the tongue lever ;
4, a spring which keeps the said tongue lever up in its place when the "door is
opened; 5, the plate to which the said last-mentioned spring is fastened by
a screw'; 6, a perpendicular plate for the end of the tongue lever to work on ;
7, 7, a plate on which the spring plate 8. works; 8, the spring plate that is
forced down on the floor when the door is shut; 9, 9, 9, horizontal rod and
cranks, which by the assistance of the spring 10 raises or lifts up the spring
plate 8, when the door. is opened; these cranks have each a mortise in: the
extreme ends thereof, through. which comes two. large pins rivetted into
the spring plate 8, with smaller pins through the ends of the above-mentioned
large pins, to confine the said cranks on such large pins. 10, the spring last
above mentioned, with a center pin rivetted to the said spring plate 8, working
up and, down in a mortise made in the plate 7, 7; 11, 11, screws which
connect the two plates: together with mortises in the plate 7 to admit.the said
screws to. work up and down; 12; the 'rod, before. mentioned, which passes
from the lock to the spring plate 8.
And I do liereby likewise further declare, that. the fourth part of 'my said
Invention consists in an apparatus to be added to a common mortise lock
already affixed to. any.door. This part of my. said Invention may be also
made of any convenient dimensions and of any proper materials.
"
The Drawing. hereto annexed; No. IIII, and the references thereto next
following, will, it is' presumed, fully explain.the nature and use of this part of
my said Invention, and the manner of performing the same.
1, tumbler to be affixed on the collár of the lock; 2, rod which comes from
the apparatus, herein-after mentioned, to be affixed at the bottom of the door
up to the lock through a hole bored vertically up the front stile, of the
door; this rod has a mortise at the upper end thereof to receive the collar of
the lock, and another at.the same end at the back part thereof to receive the
spring bolt 3 when the door opens. 3, spring bolt, which is forced back by
a blank striking plate affixed to the jamb of the door, which said spring bolt
when so forced back releases the rod 2, and lets down the bottom apparatus,
herein-after mentioned, close to the floor; 4, a spring, which keeps the spring
.bolt 3 in.its place. The bottom apparatus to be attached to doors whereon
the said last herein-before.described contrivance or invention is affixed, must

page_text: be made similar to the bottom apparatus, described and delineated in the.
Drawing hereto annexed, No. II., and the references thereto belonging,
herein-before particularly mentioned, and set forth.
And I do hereby likewise further declare, that the fifth part of my said
Invention consists of a mortise latch, that may be affixed on any door at the 5
back of any common lock or latch fastened to the face of such door, and may
be made of any convenient dimensions and proper materials...
The Drawing hereto annexed, No. V., and the references thereto next
following, will, it is presumed, sufficiently explain the nature and use of this
part of my said Invention, and the manner of performing the same.
1, 1, lever where the handle goes through; 2, a crank, to which is fastened
the upper end of a rod, which comes up from the spring plate, to be affixed to
the bottom of the door through a hole bored vertically up the front stile of the
door; 3, a lever which assists the crank in lifting up the said spring plate
to be affixed to the bottom of the door; 4, a spring to assist the lever 1, 1;
5, a stop bolt, which keeps the apparatus to be affixed to the bottom of the
door up in its place when the door is open; 6, the bevel striking plate;
7, a lever, which works against the said bevel striking plate, releases the stop
bolt 5, and lets down the spring plate to be attached to the bottom of the
door close to the floor, or into a groove made therein, at pleasure, when
the door is shut too; 8, a spring, which works against the stop bolt 5 to keep
it in its place; 9, profile of the bevel striking plate, herein-before mentioned.
The apparatus to be attached to the bottom of doors whereon the mortise
latch, last herein described, is affixed, must be made similar to the bottom
apparatus, described and delineated in the Drawing hereto annexed, No. II.,
and the references thereto belonging, herein-before particularly mentioned and
set forth.
And I do hereby likewise further declare, that the sixth and last part of my
said Invention consists of a lifting hinge, which may be advantageously used
to hang all kind of doors to which any part of the before-mentioned apparatus
is affixed or applied, or to any other door whatever, and may be made of iron
or any other kind of proper metal, and of any suitable size or dimensions.
The Drawing hereto annexed, No. VI., and the references thereto next
herein-after mentioned, will, it is presumed, sufficiently explain the nature and
use-of-the-said hinge, and the manner of making and contriving the same.
1, 1, face of hinge when door is open; 2, a quadrant, which works on the
roller 3 through a mortise made in one of the said hinge plates, and is rivetted
to the other hinge plate; 3, the roller, which works at the back of the hinge

page_text: a pin or centre; 4, 4, back view of the hinge; 5, mortise for the quadrant
work in.
In witness whereof, I, the said Daniel Langton, have to these present
my hand and seal subscribed and set, this Sixteenth day of December,
in the thirty-eighth year of the reign of our Sovereign Lord George
the Third, by the grace of God, of Great Britain, France, and Ireland,
King, Defender of the Faith, and so forth, and in the year of our
Lord One thousand seven hundred and ninety-seven.
Inrolled the same Eighteenth day of December, in the year above
written.