Year: 1887

page_text: I, JOHN THOMAS LISTER, of 388 Lake Street, City of Cleveland, Cuyahoga County,
State of Ohio, United States of America, machinist, 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:-
The invention relates to improvements in sash locks, and the object of the invention
is to make a lock for the meeting rails of a window which will press the sashes up and
down respectively and draw and lock the meeting rails together so that rattling
between the sashes and against the window casing is prevented as hereinafter
described.
In the drawings Fig. 1 is a plan view of the lock. Fig. 2 is a vertical section on
line a,, Fig. 1. Fig. 3 is a bottom view of the casing attached to the lower meeting
rail. Fig. 4 is a bottom view of part attached to the upper sash. Fig. 5 is a detail
of the eccentric cam plate. Fig. 6 is a section view of the operating lever showing
the lock therein, and of the spindle attached thereto.
In Figs. 1, 2 and 3, A represents a shell or casing provided with an opening a for
the spindle that controls the locking eccentric and cam, and cut away along one edge
as a to adapt the shell to be set close upon the edge of the meeting rail to which it
is attached. At one side near the opening a is a short slot a² which is engaged by
the latch in the handle when the lock is closed, and on its under side is a rib or lug a
which limits the rotation of the cam in either direction.
B is a plate provided with an angular hole with which the spindle is constructed
to engage, to turn said plate, and a rib around the edge thereof except where it is
cut away as at 62, corresponding to the cutaway portion of the shell A. This is
annular upon its outer edge and eccentric upon its inner edge as is plainly apparent
in Fig. 5, and will be seen by comparing the points marked 1 and 2 with the contre
of rotation. The rib increases in vertical depth from the point 1 to point 2 as is
likewise apparent in Figs. 2 and 5.
C is the spindle which turns freely in the casing A and is angular at c to engage
with the plate B and rotate the same when the window is to be locked or unlocked.
Integral with the spindle is a handle in which is pivoted a latch c' which engages
the slot a² in the casing when the lock is closed and prevents opening of the lock by

page_text: an instrument inserted from the outside or otherwise than in the regular way. The
slot a² is just long enough to permit slight play of the lever, but not enough to unlock
the cam.
D is the section or part of the lock which is attached to the upper sash and has a
straight front edge as shown at d and a lip d' with a slightly inclined and somewhat
sharpened edge so as to easily and gradually make engagement with the locking
plate B.
.
When the parts are unlocked the straight edges coincide and the sashes are free to
be moved past each other. When they are locked the cam crosses and engages the
lip of the piece on the upper sash. It will be observed that the plate D is limited
to a horizontal rotary movement and that it is so constructed that it combines the
functions of drawing and locking the sashes together, while it also raises the upper
sash in relation to the lower sash, and at the same time depresses the lower sash, if
it is not already down, thus bearing both sashes against the casing above and below
and binding them together at the centre, and preventing shaking or rattling.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :
1. In a sash lock, a locking plate having an eccentric cam shaped rib arranged
along a portion of its edge and cut away on one side substantially as shown, an
inclosing case correspondingly cut away on one side, and a spindle and handle for
rotating the locking plate, in combination with a locking piece having a straight
front edge, and a curved groove and lip within said edge, whereby when the parts
are brought into engagement the sashes are locked, substantially as set forth.
2. In a sash lock, an inclosing case, a locking plate having an eccentric cam shaped
rib along a portion of its edge and a handle on the spindle with a latch to hold it
when the lock is closed, in combination with a locking piece for the upper sash,
substantially as set forth."
Dated this 14th day of November 1887.