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Патент USA US3036859

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May 29, 1962
Filed Dec. ' 11, 1959
W 53 MM
Unitcd States Patent
Patented May 29, 1962
Alfred C. Wilson, Northbridge, Mass, assignor to The
H. B. Ives Company, New Haven, Conn., a corpora
tion of Connecticut
Filed Dec. 11, 1959, Ser. No. 858,988
2 Claims. (Cl. 292-241)
quadrant lock for Dutch doors of the character described
above wherein each of the arms is provided adjacent its
outer end with a loop or bridge structure to permit com
plete release of the quadrant from the keeper.
To these and other ends the invention consists in the
novel features and combinations of parts to be hereinafter
described and claimed.
In the accompanying drawings:
This invention relates to a quadrant latch for so-called
FIG._1 is a front elevational view of a conventional
Dutch doors, the term being employed to refer to a door 10 Dutch door having a quadrant lock embodying my in
divided horizontally into two sections so that the upper
vention applied thereto;
section may swing to open and closed position independ
FIG. 2 is an enlarged front elevational view of the
ently of the lower. In securing such doors in closed posi
tion a lock or latch is provided upon one thereof, and
FIG. 3 is a top plan view of the lock as shown in FIG.
some type of fastening is employed to secure the other 15 1; and
door to the one held closed by such lock or latch. The
FIG. 4 is a sectional view on line 4—4 of FIG. 2.
present invention relates particularly to a fastening or
To illustrate one embodiment of the invention I have
securing lock or latch to secure one of the doors to the
shown in a conventional manner a Dutch door comprising
a lower section 10 and an upper section 11, these sections
In the form of the invention shown in the drawings a 20 being hinged at their left-hand edges, as shown at 12 and
latch member of quadrant shape is provided pivoted to
one door (the lower in this instance) on a horizontal
pivot so that it may swing in a vertical plane. This
quadrant member consists of a pair of angularly related
13. The upper edge of the lower section and lower edge
of the uppersection meet along the horizontal line desig
nated by the numeral 14.
Secured to one of the doors, the lower in this instance,
arms diverging from the pivot point of the member, the 25 is a supporting plate 15 having a headed pivot pin 16
outer ‘ends of the arms being connected by a member of
secured thereto. Rotatably mounted upon the pin 16 is
generally arcuate shape. Upon the other door is provided
a latch or locking member of quadrantal shape, this
a keeper which, as illustrated, is in the form of a headed
member comprising a pair of radially directed arms 17
stud adapted to be engaged by a cam surface on the
and 18 diverging from the pivot 16 and a member 19 of
arcuate member of the quadrant to lock the two doors 30 arcuate shape connecting the outer ends of these arms,
?rmly together when the quadrant is moved about its
the three members forming an open quadrant.
As illustrated, the lock is secured adjacent the free edge
Such locking "members are normally mounted adjacent
of the door sections, as shown in FIG. 2, the free edges
the free edge of the door (the "edge remote from the
being designated by the numerals 20* and 21 respectively
hinged edge), and it is desirable, when the quadrant is 35 for the lower and upper sections. A spring washer 22
swung about its pivot, that the quadrant move over the
(FIG. 4) may ‘be disposed between the quadrant member
vsurface of the door toward the hinged edge and not
and the plate '15 so as to provide frictional means for
toward the free edge. Therefore, if the cam surface
holding the quadrant in position to which it is moved
upon the arcuate member of the quadrant is unidirec
without free play. Upon the arcuate member 19‘ is pro
tional, a separate structure would be required for doors 40 vided a knob or button 23 designed to be manually en
hinged at the left-hand edge and those hinged at the
gaged so that the quadrant may be readily swung about
right-hand edge. It is, however, a special feature of the
its pivot 16.
present invention to provide a quadrant which may be
Upon the other door section is secured a keeper plate
used upon doors of either hand and which quadrant may
24 having a keeper member thereon which in this in
be swung in either direction depending upon the position
45 stance comprises a pin 25 having an enlarged head 26, the
of its mounting upon the door.
head having a tapered inner surface 27. On the inner
To this end the quadrant is provided with two cam
or lower edge of the member 19 are provided cam sur
surfaces, one extending from each edge thereof toward
faces 29 and 30. These surfaces are substantially alike
an intermediate point, at which point a stop is provided
except that they are oppositely directed. In other words,
to limit the movement of the quadrant in one direction
the inner edge of each of these surfaces, these edges be
or the other‘. These cam surfaces are oppositely directed
ing designated at 31 and 32, are more remote from the
so as to effect a camming action when the quadrant is
pivot 16 at their outer ends than at their inner ends adja
moved in such a direction that the keeper is advanced
cent the intermediate portion of the member where the
from the edge of the quadrant toward the intermediate
knob 23‘ is secured.
point where the stop member is located. Also upon
It will also be noted that the surfaces 29 and 30 are
each of the arms of the quadrant are provided loops or
beveled rearwardly and downwardly, as shown at 33 in
bridge portions to permit the keeper to pass therethrough
FIG. 4, so that they will snugly engage the tapered sur
so that the quadrant may be entirely disengaged from the
face 27 upon the keeper member 25. Also a projection
or stop in the form of an inwardly directed arrow 35 is
One object of the present invention is to provide a new
provided at an approximately central point on the inner
and improved quadrant latch for Dutch doors.
surface of the quadrant between the cam surfaces 29 and
A further object of the invention is to provide a Dutch
'30, and upon each side of this stop is a recess to receive
door latch or lock which may be used upon doors of
the shank portion of the keeper 25 so as to releasably
either hand without change.
hold the quadrant in place with respect to the keeper,
Still another object of the invention is to provide a
these recesses being designated by the numerals 36 and 37.
lock or latch for Dutch doors in the form of a pivoted
In order that the quadrant may be entirely released
quadrant, tthe quadrant consisting of two radial arms
from the keeper to be swung from the full-line position
diverging from the pivot point, the outer ends of the
shown in FIG. 2 to the dotted-line position shown in this
arms being connected by a member of arcuate shape hav
?gure and in order that the same structure may be used
ing oppositely directed cam surfaces facing the pivot of
70 for a door of either hand, each of the arms 17 and 18
the quadrant.
is provided ‘with a looped or bridge portion, as shown at
Still another object of the invention is to provide a
40 and 41. These portions are su?iciently offset out
wardly from the arcuate member 19 and the remaining
portions of the arms of the quadrant so as to permit the
head 26 of the keeper 25 to pass therebelow.
As illustrated in the drawings, the quadrant is mounted
upon a door of the left hand, that is one hinged upon
the left-hand side, and in this instance the plate 24 will
angularly related arms diverging from the pivot point and
having an arcuate element connecting the outer ends of
the arms remote from the pivot, a keeper member on the
other door section, a stop member provided upon the
inner edge of said arcuate element at an intermediate
point thereon, said edge receding from said pivot point
in both directions away from said stop member to pro
be so mounted that the keeper will lie between the stop
vide cam surfaces, either of which is adapted to engage
35 and the arm 18 when the quadrant is in the position
said keeper member, and each of said arms being pro
shown in FIG. 2. If the device is used with a door of the
vided with an outwardly offset portion adjacent its outer
other hand or one hinged at the right-hand side, the
end to permit passage of the keeper member thereunder,
keeper 25 would lie on the other side of the stop 35.
said otfset portions connecting the arcuate element to the
In operation the quadrant would normally lie in the
outer portions of the arms.
position shown in dotted lines in FIG. 2, and the upper
2. A quadrant latch for a Dutch door comprising
section of the door would be unlocked. When the upper
section is closed and it is desired to lock it, the quadrant 15 upper and lowerisections, said latch including a sector
shaped member pivoted to one section of the door, said
would ‘be swung by engagement of the knob 23 about
member comprising angularly related arms diverging
its pivot 16 in a clockwise direction to the position shown
in full lines in this ?gure. During this movement the
head 26 of the keeper would pass below the loop 41 so
as to be received within the quadrant between the arms
thereof and be engaged by the cam surface 31. As this
surface rides over the keeper its inner edge will gradually
approach the adjacent surface of the keeper and, if the
parts are correctly positioned upon the doors, the keeper
from the pivot point ‘and an arcuate element connecting
the outer ends of the arms remote from the pivot, each
of said arms having a ?at portion adjacent the pivot point
and being provided with an outwardly offset loop portion
adjacent its junction with said arcuate member connect
ing the arcuate portion with said ?at portions, a keeper
member secured to the other section of the door and
will be wedged tightly within the recess 36 when move 25 adapted to pass under either of said loop portions to be
engaged by the inner edge of said arcuate element, a stop
ment of the quadrant will be limited by the stop 35.
on said edge projecting toward said pivot sub
The same operation is present when the device is
stantially midway between the arms, and said edge pre
mounted upon a door hinged at the right except that the
senting oppositely directed cam members on each side
keeper will be upon the other side of the stop 35. In this
of said stop member and extending toward said arms, and
instance the quadrant would be swung in a counterclock
each of said edges receding from the pivot point in a
wise direction from the position shown in dotted lines in
direction toward the adjacent arm.
FIG. 2 to approximately the position shown in full lines
in order to lock the upper section of the door.
References Cited in the ?le of this patent
While I have shown and described one embodiment of
my invention, it will be understood that it is not to be
limited to all of the details shown, but is capable of modi
?cation and variation within the spirit of the invention
and within the scope of the claims.
What I claim is:
1. A latch for a Dutch door comprising a member piv
oted to one section of the door, said member comprising
Loetscher ____________ __ Mar. 31, 1896
Bray _________________ __ Nov. 1, 1910
Phillips ______________ __ Jan. 16, 1934
Germany ____________ __ Dec. 18, 1942
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