IMPROVEMENTS IN LOCKS AND LATCHES AND IN PARTS CONNECTED THEREWITH
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by John Matthias Hart at the Office
of the Commissioners of Patents on the 16th December 1882.
JOHN MATTHIAS HART of the firm of Hobbs Hart and Company of 76 Cheapside
in the City of London IMPROVEMENTS IN LOCKS AND LATCHES AND IN PARTS
CONNECTED THEREWITH
The object of one part of the invention is to facilitate the withdrawal of the
latch bolt of Locks and Latches by arranging the parts thereof so that such with-
drawal may be readily effected not only as now by the partial rotation of the
handles in one or the other direction but also by pressure exerted on either or both
handles in any of several directions.
For this purpose the latch bolt is capable of being acted upon for its withdrawal
by one end of a double-ended lever the other end, of which supports a link, of a
curved, or other suitable, form, adapted to be acted upon by the horns of the
"follower" so that by turning the handle in either direction the link will be acted
upon to cause the double-ended lever to turn upon its axis of motion and thereby
withdraw the latch bolt so as to admit of the opening of the door or other part to
which the lock or latch is attached-Springs aid in keeping the parts in their
correct relations
By simple pressure without necessary partial rotation on either or both of the
handles in any of various directions the link or lever referred to will be caused to
act on the double or it may be a single ended lever to cause a like withdrawal of
the latch bolt.
The parts of the lock or latch are formed to admit of these various movements
being readily given to the spindle and the necks or parts of its follower-On
release of the handle or handles the knobs spindle and parts return to their normal
position.
In order to withdraw the latch bolt by simply pressing the knob or handle or a
part or parts thereof inwards the handles or part or parts thereof are formed and
applied so as to be capable of the desired endway motion and the inner end or
operating part of each knob or handle is provided with a pin adjustable, as to its
length, and the ends of these pins bear on buttons or suitable parts carried by arms
at levers with inclined, or wedge shaped, ends to act on a friction roller carried by
a lever to withdraw the latch bolt.

page_text: In order to afford facility for withdrawing the latch bolt, by a pulling or pushing
action on the knob or handle as well as by a partial rotary action the spindle
operates corresponding leverage or a sort of crank movement working over the
follower
I further connect the handles of the locks or latches to the door or other place by
plates each of which is passed onto a neck formed for it on the stem of the knob
or handle and which is there held so as to admit of its free rotation by a nut
screwed onto the stem of this neck and there made fast in position by a screw or
other suitable fixing-This plate may be applied to the door or other part by screws
One end of the spindle or part spindle is fixed in such stem or portion of the one knob
and the other end of the spindle or other part spindle is fixed in the stem or portion
of the other knob or handle and the spindle is made fast to the lock by being
screwed to the follower.
I also for the purpose of facilitating the adjustment of the handles to the
thickness of the door or part to which the lock or latch is applied form one end or
part of the spindle with a slot or opening through it for the passage of a screw
through that slot or opening and the neck of the handle or knob and the spindle
at this end is also formed with a thread or with part threads adapted to screw into
the neck of one of the handles or knobs and thereby adjust the position of that
handle in relation to the length of the spindle When this adjustment has been
obtained then by passing a screw where desired through the parts of the neck of
the knob or handle and the slot or opening in the spindle the knob or handle will
be prevented from becoming unscrewed-The screw is prevented from coming
undone by a collar from the rose covering it.
I form the spindles of steel