Improvements in Sash Locks for Windows.
Year: 1893

page_text: Date of Application, 14th Feb., 1:93-Accepted, 8th Apr., 1893
COMPLETE SPECIFICATION.
Improvements in Sash Locks for Windows.
I, GEROLT GIBSON, of 117 North 8th Street of the City of St. Louis, in the
County of St. Louis, and State of Missouri, U.S.A. Lawyer, do hereby declare
the nature of my invention and in what manner the same is to be performed, to
be particularly described and ascertained in and by the following statement :-
My invention relates to an improved sash lock, more particularly for the upper
sashes and it has for its object to effect the automatic locking of the sashes against
accidental downward displacement, from any jarring motion or the action of the
wind, from house-breakers or other causes, and yet provide for effecting in a simple
and expeditious manner, the manipulation of the lock in lowering the sash, and to
these ends my invention consists in the novel combination of parts substantially as
hereinafter more fully disclosed and pointed out in the claims.
In the accompanying drawings-
Figure 1 is a side view of a window frame with its upper and lower sashes, parts
being broken away, embodying my invention.
Figures 2 and 3 are detailed views of my sash-lock, the latch or dog being shown
reversed, and
Figures 4 and 5 are detailed plan views of the same, and
Figure 6 is a modification of the invention.
In the embodiment of my invention I produce it in three castings or pieces, the
bracket A, the latch or dog B and the catch C.
The bracket A consists of the vertical base adapted to be secured by screws or
otherwise to the parting bead or let into the same, and of the face-plate a³ integral
with said base and flush with its front edge and obscures from view the greater
portion of the latch.
The latch or dog B is hung or pivoted, a short distance below its upper end,
so as to stand vertically with its tooth normally resting against the base a, its
pivot & passing through it and fixed in the face-plate a' and a lug a² on the base a
of the bracket A.
The latch or dog B has an outstanding or outwardly deflected upper end 61,
to permit the convenient manipulation thereof, by the pressure thereupon of the
finger toward the base a of the bracket A, when the upper sash is to be lowered.
The lower end of the latch or dog B, though beveled both inward and outward
as at 6', need not, necessarily, be beveled, only inward, and has an upwardly facing
broad flat shoulder as at 63 near said end and notched or recessed in its forward
edge just above said shoulder to cause said shoulder to stand inward instead of
being in the form of an offset, to reduce the latch to a minimum width.
The catch C, preferably a rectangular plate c, adapted to be secured by screws,
or otherwise, to the upper sash, has projecting from the upper left hand corner of
its said plate & lug c¹ beveled upon its upper surface inward or toward the latch,
and having a broad flat lower surface for engagement with the corresponding upper
surface of the shoulder 6 of the latch B to form therewith a solid interlocking
action, while the beveled meeting surfaces of the latch and catch, permit the ready
interlocking of said parts.
The plate c has at its lower or bottom edge a horizontal ledge or extension to
close the notch or recess cut in the top rail of the lower sash for the passage, in the
movement of the upper and lower sashes of the catch with its lug.
In the modification, as disclosed in Figure 5, the parts are reversed, a helping
or enabling spring d also being employed, such a spring also being used in the
preferred form of the lock, as shown in the other figures, if desired, to assist
gravity.

page_text: The operation of my lock is apparent, as it will be seen that, assuming the upper
sash to be lowered; by pushing upward on said sash, the latch and catch will inter-
lock and said sash be forced jamb tight upward and be thus held against accidental
downward displacement or being otherwise jarred downward, as for instance by the
action of the wind or other forces.
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 :
In a. sash lock, the combination of the bracket having the face-plate at the front
edge of its vertical base, and a lug, the dog or latch hung near its upper end,
between said face-plate and lug, having a lower beveled end and an outwardly
deflected upper end, and the catch having at its upper left hand corner a beveled
stud, substantially as set forth.
Dated this 2nd day of Tanu 1802