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Патент USA US2106116

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18, 1938.
ll.. DzUKALo
Filzed Feb. 27, 1936
2 Sheets-Sheet 2
Patented Jan. 18, 1938
Leo Dzukalo, Badaxe, Mich.
Application February 27, 1936, Serial No. 66,117
1 Claim.
The present invention relates to new and use
ful improvements in window locks and has for its
primary object to provide, in a manner as herein
after set forth, coacting means on the meeting
Ll rails of the upper and lower sashes of windows
through the medium of which said sashes may
be automatically and positively locked in closed
Another very important object of the inven
tion is to provide a window lock of the afore
mentioned character which may be conveniently
released from the inside of the window when it
is desired to raise or lower either or both of the
Other objects of the invention are to provide
a window lock of the character described which
will be comparatively simple in construction,
strong, durable, highly eiiîcient and reliable in
use, compact, light in weight and which may be
manufactured at low cost.
All of the foregoing and still further objects
and advantages of the invention will become ap
parent from a study of the following specifica
tion, taken in connection with the accompany
lí. El ing drawings wherein like characters of refer
ence designate corresponding parts throughout
the several views, and whereinz-
Figure 1 is a View in vertical section through
the meeting rails of a pair of sashes, showing a
lock constructed in accordance with the present
invention installed thereon.
Figure 2 is a top plan view.
Figure 3 is a top plan view of the casing and
locking levers with the top removed from said
includes a removable top or cover portion I3.
The casing has a bottom wall I3a, front and rear
end walls, I2a and I2b respectively, and opposite
side walls I2C rising therefrom. Mounted verti
cally in the substantially closed chamber 2I of Ul
the casing I 2 are spaced pins or the like I4 on
which locking levers I5 are journaled at an
intermediate point for swinging movement in a
horizontal plane. The end portions of the levers
I5 project beyond the casing I2, as illustrated 10
to advantage in Figure 3 of the drawings. One
end portion of the levers I5 projects over the rail
2 of the upper sash «l for engagement in the
notches of the plate 6 beneath the head 8. The
opposed sides of these end portions of the levers
I5 are undercut, as at I6, to facilitate spreading
0f said levers when they engage on the pointed
head 8 of the plate 6 and ride downwardly there
on just prior to snapping into the notches. The
undercut portions I6 of the levers are of right 20
triangular cross-sections the sides of the angle
between the altitude and hypothenus of which
conforms to the angular notches. The other end
portions of the levers I5 are formed to provide
handles I'I which are adapted to be pressed to
gether against the tension of a coil spring I8 in
the casing I2 for disengaging said levers from
the notches thereby unlocking the sashes 3 and
4. The front and rear walls of the casing I2
are recessed respectively as at |811; and Ißb (see 30
Figure 3) to accommodate the projecting end
portions of the levers I5.
It is believed that the many advantages of a
window lock constructed in accordance with the
Figure 4 is a view in vertical transverse Sec
tion, taken substantially on the line 4--4 of Fig
ure 2.
Figure 5 is a detail view in perspective of one
(Cl. 292-54)
of the pivoted locking levers.
Figure 6 is a detail view in front elevation of
the locking plate.
Referring now to the drawings in detail, it will
be seen that the numerals I and 2 designate
the meeting rails of the lower and upper window
sashes 3 .and 4, respectively.
The reference
numeral 5 designates a window frame of conven
present invention will be readily understood, and
although a preferred embodiment of the device
is as illustrated and described, it is to» be under
stood that changes in the details of construction
and in the combination and arrangement of
parts may be resorted to which will fall within
the scope of the invention as claimed.
What is claimed is:
A lock for attachment to the meeting rails
of window sashes and comprising a keeper plate
on one rail having an upstanding keeper lug pro
vided wíth a Wedge shaped upper end and a pair
of opposed notches in the side edges thereof, re
spectively, each of acute angled form, and a pair
tional construction in which the sashes 3 and 4
are mounted for vertical sliding movement.
Rigidly mounted on the rail 2 of the upper
sash 4 is a vertical plate E having a pointed
upper end and further having acute angled
rail and having corresponding ends extending
notches or recesses formed therein in a manner to
from said rail upon opposite sides of said lug,
provide a head 8.
The notches each have corre
sponding horizontal edges 'I and inclined edges
The plate 6 includes an apertured base 9
through which screws I0 are inserted for secur
ing said plate 6 in position on the rail 2.
Rigidly secured, as by screws I I, on the rail
60 I of the lower sash 3 is a metallic casing I2 which
of opposed laterally spaced locking levers pivot
ally mounted intermediate their ends on the other
respectively, to receive the latter therebetween,
said ends conforming in cross sectional contour
to that of said notches, and said levers being
tensioned to urge said ends thereof together to
be cammed apart by said wedge shaped head.
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