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Патент USA US2131899

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0a. 4, 1938.‘
T‘ W, MOODY
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2,131,899
SAFETY LATCH
Filed May 22, 1936
EIN
Patented Oct. 4, 1938
~ 2,131,899
I! UNITED(STATES PATENT OFFICE
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2,131,899'
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SAFETY LATCH
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‘ , Thomas W. Moody, "llcuston, Tex.
Application May #22, 1936, “Serial No.“ 81,147
3 Claims. (c1. 292-;219)
‘This invention relates to- ‘a safety latch.
cover plate 5, and the wing 3 and the outer end
of the stem has the grip member 8 by means of
which the stem and the plate. 6 may be turned;
The plate-Ghas an eccentric pin 9 fastened there
‘Another-object of’ theinvention is to provide to
and extending outwardly therefrom and has
a safety latch of the character described espe
thev
roller 10 on saidv‘outwardly extended end.
cially designed to be fastened to the upper sash ,
the casing ‘above ‘and behind the plate 6, there
of'a window and so positioned‘that theupper In
is a transversev anchor post I I about which a
sash or ‘the lower sash‘may ‘be-~ only partially spring
I2 is coiled. One arm l3, of the spring en
opened ‘for ventilation, but latched so that they gages behind a stop l4 projecting outwardly from
An Object ofv the invention-is to provide a latch
for slidable closures :such as slidably mounted
windows;
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cannot be further ‘opened from the outside.‘ ‘
- Astill further‘ object of the invention resides
in the provision‘ of a latch of the character de
scribed that may be readily-moved to, and main
15 tained in, inactive ‘position so as to permit the
full opening of "the window‘ sashes.
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It~is “still ‘another object of the invention to
provide a latch that will automatically assume
20
active, or latching, position when the‘windows
are ‘closed.
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the wing 3 and its other arm I5 is off-set and
formed ‘with an arcuate bearing portion which
engages around the roller In, as more accurately
shown in ‘Figure 3, the ‘free end of the arm‘ l5
7 being extended beyond the curved bearing por—‘
tion thereof.
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» ‘The plate 6 maybe turned into active or latch
ing position, as shown in Figure 2, the roller l0
riding along the extended free end of the ‘spring
arm l5, into» position beneath and infront of
With the above and other objects in View, the] the stem 1 where the roller lillengages against 20
invention has particular relation to certain novel the. lip IQ of the cover' plate 5, thus limiting the
features of construction,operation, and arrange
rotation of the plate‘ 6 (see Figures 2 and 5) and r
ment of parts, an example of which is given in
as also shown in Figure 7. This will project the
panying drawing-wherein:
lower margin or latch portion l6 of the plate 6 25
outwardly into the path of the lower window sash
so that when it is attempted to elevate said lower
25 this speci?cation andvillustrated in the accom
Figure 1 shows a front elevation of the latch.
Figure 2 shows a side view.
Figure 3 shows a sectional view taken on the
30 line 3—-3 of Figure 1.
Figure 4 shows a plan view.
Figure 5 shows a cross-sectional View taken on
the line 5-5 of Figure 2.
Figure 6 shows a front elevation of thelatch
‘as' as applied to a window, at a suitable elevation,
and
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Figure 7 shows a side vview thereof showing
the sashes in section.
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Referring now more particularly to the draw
40 ing wherein like numerals of reference designate
similar parts in each of the ?gures, the numeral
I designates an angle plate having the wings 2, 3,
turned at right angles to each other. The wing
2 is adapted to ?t against the front face of the
45 side frame 4 of an upper sash, and the wing 3
is adapted to ?t closely against the inner margin
of the side frame 4.
.
There is a cover plate 5 as seen in Fig. 5, whose
upper and lower margins have the dove-tailed
50 connection with the wing 3 as seen in Fig. 1 and
may be permanently secured thereto in any pre
ferred manner. The cover plate 5 and wing 3
form a casing in which there is mounted a latch
plate 6. This plate is ?xed on the stem 1 which
55 is rotatably mounted in suitable bearings in the
sash, it will eventually engagethe latch portion
[6, as indicated in dotted lines in Figure 7. As
this portion of the plate v6 has a constant radius 30
of curvature, the plate will not be rotated by
engagement with the lower sash and hence the
device will serve to stop the upward movement
of the lower sash. The lower sash may thus be
partially opened for ventilation purposes, but, not 35
enough to permit entrance from the outside.
The distance through which the lower sash
may be raised will depend on the location of the
latch on the upper sash.
The latch may be so
located as to give the required window opening 40
for safety. The distance to which the upper
sash may be lowered will‘depend also on the loca
tion of the latch. Since the latch is secured to
the upper sash, any attempt to lower the upper‘
sash will carry the latch downwardly and eventu 45
ally the lower sash will engage the projecting.
portion I6 as indicatedrin dotted lines, Figure 7,
so as to limit the downward movement of the
upper sash. The upper sash may thus be par
tially lowered for ventilation purposes with safety, 50
or the distance allowed by the location of the
latch may be divided leaving airing space at the
top and bottom of the window, if desired. When
it is desired to move either sash of the window
more than above indicated to increase the size 55
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2,131,899
of the openings, the plate 6 may be turned in the
opposite direction, to inoperative or tripped posi
tion, the roller l0 riding along the extended free
end of the arm l5 and ?nally seating in the
arcuate portion thereof to limit the reverse rota
tion of the plate 6. When in this position, the
upper margin or trip portion ll of the plate 6 will
project forwardly beyond the casing; this will
allow the sashes to be opened easily, and when
10 the lower sash strikes said trip portion ll, the
plate 6 will move into intermediate position.
temporarily, both latch and trip portions l6 and
I‘! being approximately flush with the forward.
side of the casing with the forward face of the
latch portion l6 riding against the outer side of
15
the upper cross member of the lower sash. When
the plate 6 clears the upper side of the cross
member, the arm l5 will again force the forward.
face of the latch portion 16 outwardly, (as shown
in Figures 2 and '7) where it will remain in this
manner, until the sashes are closed to allow the
plate 6 to pass back to the upper side of the pre
viously mentioned cross member. The plate 6 is
temporarily repressed in the case while passing
the cross member, the roller ID will ride along the
extended free end of the arm l5 until the plate 6
clears the upper side of the lower sash cross mem
ber. The arm l5 will again force the forward
face of the latch portion l6 outwardly into latch
ing position as shown in Figures 2 and '7. Thus
so it will be apparent that the latch is normally in
latching or operative position and must be re
tracted when the window is to be opened a sub
stantial amount but will automatically move to
35 latching position when the window is thereafter
closed.
The wing 2 is provided suitable openings, as‘ [8,
to receive the fastening screws whereby the latch
may be secured to the uppersash or to any other
40 ?xed anchor.
What I claim is:
1. A safety latch to limit the relative move
ment of two window sashes comprising an anchor
plate to be ?xed to one sash, an irregularly shaped
latch plate pivoted on said plate for turning
movement transversely of the window, a latch
portion on said plate to project into the path of
the other sash, spring means normally urging
said plate to latching position, a handle member
to turn said plate in opposition to said spring to 10
a tripped position so that the sash may be moved
beyond the limited position.
2. A safety latch to limit the relative move
ment of two window sashes comprising an anchor
plate to be ?xed to one sash, an irregularly shaped 15
latch plate pivoted on said plate for turning
movement transversely of the window, a latch
portion on said plate to project into the path of
the other sash, spring means normally urging
said plate to latching position, a handle member 20
to turn said plate in opposition tol'said spring'to
a tripped position so that the sash may be moved
beyond the limited position, and a trip portion
on said plate to be engaged by the movement of
the sash so as to trip said latch back to latching
position.
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3. A safety latch to limit the relative move
ment of two window sashes comprising an anchor
plate to be ?xed to one sash, a latch plate pivoted
on said anchor plate for turning movement trans
versely of the sash, said latch plate having spaced
peripheral trip and latch portions, a handle mem
ber to turn said latch plate to a tripped position;
whereby the sash may be movedbeyond the lim
ited position, and spring means ?xing the tripped
position of said latch plate when the handle is
turned and normally urging saidplate to latch
ing position when displaced from the tripped posi
tion.
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THOMAS W. MOODY.
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