An Improved Door Latch.
Year: 1890

page_text: Date of Application, 3rd Oct., 1890
Complete Specification Left, 20th Nov., 1890-Accepted, 20th Dec., 1890
PROVISIONAL SPECIFICATION.
An Improved Door Latch.
I THOMAS CHARLES ALEXANDER of 173 Kilburn Park Road, Paddington,
London, Decorator, do hereby declare the nature of this invention to be as
follows:-
This invention can be used with rim, flush or mortice locks.
In this invention the latch bolt will retract when the door knob is moved or turned
in any direction except a direct horizontal pull or push.
It consists of a spindle or lever A, Figs. 1 and 2 to carry the door knobs the said
spindle passing through two slots M, in the sides of the lock directly under the short
arm of the bent lever B, and at the side of the lever S. A small space in each slot
is left above and at the side of spindle to allow it a perpendicular horizontal or
diagonal movement.
A short arm R, connects the lever B with the lever S.
F. W and H. are fulcrum pins.
T and D are springs.
Fig. 2 is a section at E-K of Fig. 1.
The dotted lines shows how the movement of the door knobs P, and the spindle A,.
raises the short arm of the lever B.
A similar but horizontal or diagonal movement moves the lever S.
The spindle finds a fulcrum sometimes on one side of the lock case and sometimes
on the other according to the direction the knobs are moved.
The long arm of the ler B, works into a groove L, in the latch bolt C, so that
when the long arm is depressed it draws in the latch bolt.
N is one side of the lock case. Fig. 2 shows both sides.
Dated this 2nd day October 1800
THOMAS CHARLES ALEXANDER,
Applicant.
COMPLETE SPECIFICATION.
An Improved Door Latch.
I THOMAS CHARLES ALEXANDER of 173 Kilburn Park Road in the Parish of
Paddington in the County of Middlesex Decorator 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 :-
This invention is designed for use as a door latch either by itself or in com-
bination with an ordinary rim, flush, or mortice lock.
In this invention the spindle for carrying the door knobs passes through a slot
or hole made in each side of the lock case, the said slots being large enough
to allow of the spindle being moved in a lateral, perpendicular or diagonal
direction.
The said spinale presses directly against the end of the levers to the latch
bolt without the intervention of a drum, cylinder or any other attachment.
When the door knobs are pressed in any direction (except a direct horizontal
pull or push) or rotated, the spindle presses against the levers to the latch bolt,
thereby retracting it.
Fig. 1. represents one side of the lock case showing the levers, latch bolt, a section
of the spindle, &c.
N. is the side of the lock case. A. is a section of the spindle passing through
the slot, M. The spindle being directly under the short arm of the lever, B.

page_text: and at the side of the lever, S. The lever, S. is connected to the lever, B. by means
of the arm, R.
When the door knob or spindle is pressed in a lateral direction, one side of
the spindle presses against the lock case, and one side against the lever, S.
When the spindle is moved perpendicularly one side presses against the lock case,
and the other against the lever, B.
When the spindle is moved diagonally two sides of it press against the lock case
and the other two against the levers, B. and S. respectively.
When the spindle is rotated it presses against both the levers.
The lever, B. works in the groove, L. in the latch bolt, C. and when the longest
arm of the lever, B. is depressed it retracts the latch bolt.
F. W. and H. are fulcrum pins.
D. is a spring.
Where it might be required, in place of the lever, S. and the connecting arm, R.
a bent lever with a fulcrum pin about in the centre could pass over the short arm of
the lever, B. and press one end of it upon the spindle and the other upon the lever, B.
just beyond the fulcrum pin, F.
Fig. 2. is a longitudinal section of the spindle, A. and the door knobs, P. showing
the method of working the door knobs and the roses thereto.
The door knobs have a concave rim working upon a convex boss upon the roses, 0.
thereby allowing the door knobs to be moved in any direction.
T. is a portion of a door enclosing a section of a mortice lock.
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
The having in each side of the lock case a slot or hole through which the spindle
to carry the door knobs passes in direct contact with the levers. The said slots or
holes to be made of sufficient dimensions to allow of the said spindle being moved in
a lateral, perpendicular, or diagonal direction against the levers to the latch bolt
sufficiently to retract the said latch bolt.
Dated this 21st day of November 1890.
THOMAS CHARLES ALEXANDER,
Applicant.