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Sept- 17, 1946.
Filed‘Dec. 11, 1944
2 Sheets-Sheet l ‘
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1 ,5/4! 292 1.0
QLL 14,15
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Sept. 17, 1946'.
Filed Dec. 11, 1944 -
2 Sheets-Sheet 2
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Patented Sept. 17, 1946
Horace E. Frost, Grand Rapids, Mich.
Application ‘December 11, 1944, ‘Serial No. 567,541
5 Claims.
(Cl. 292-169)
This invention relates to a latch structure espe
‘cially adapted for use on inside doors and to
tional construction. In installing the latch, a
‘cylindrical opening 2 is bored inwardly at the
‘which there may be readily applied a simple lock
ing device which may be set at one side of the
door and also released from the same side of the
door, such type of latch and lock associated
‘therewith being usable in conjunction with bath
free vertical edge of the- door and transverse -
room doors. Further, with .my invention a means
received within the opening 2, said casing at its
openings 3 through the door and across the
opening 2 toward the inner end thereof. The
latch bolt assembly comprises a cylindrical cas
ing 4, of an exterior'diameter such that 'it is
open outer end :having an outwardly extending
is ‘provided for an emergency unlocking of the
latch, for example on a ‘bathroom door from the 10 annular?ange 4a which when installed, as shown
‘in Fig. 2 is covered by a rectangular plate 5 ‘of
outside, which emergency operation will require
metal inset at the edge of the door, and having
an opening for the passage of the projecting end
A primary purpose of the invention is to pro
of the latch bolt. The casing 4 carries within it
vide a latch construction both with and without
‘the inside look “therefor which is economical to 15 a coiled spring 6 which seats at its inner end
against the bottom of the casing and at its outer
produce and install, which is simple in structure
end 'comes against the inner end of a bolt head
and operation and in which parts entering into
‘I of conventional shape and form having an in
the assembled structure are duplicated at both
clined strike engaging side. The bolt is com
sides of the door, this enhancing ‘economy of man
20 pleted by an elongated rod or stem 8 which passes
through the spring 6 and through an opening in
The invention, its operation and results may
the bottom of the casing 4, and extends into the
be understood from the .following ‘description
cylindrical opening 2 so as to lie partly across
taken in connection with the accompanying draw
the transverse opening 3 when the bolt ‘is in
ings, in which,
Fig. l is a horizontal section through the latch 25 outer position and ‘wholly across when the bolt
is retracted. It is evident that normally, when
‘at the edge of a door at which the latch of my
‘free to do so, the "spring 6 moves the latch bolt
invention is installed, showing the installation of
v‘to its outer projected position as shownin Figs. 1
the parts on the door.
and 2. Said bolt adjacent its ‘inner end has an
Fig. 2 is a vertical section between opposite
front and rear sides of the door, showing the 30 axial opening of passages 9 therethrough as
latch in side elevation.
At each ‘side of the door in the installing, ‘an
Fig. 3 is a vertical transverse section ‘substan
es'cutcheon housing to pressed from sheet metal
tially ‘on the .plane of line 3—-3 of Fig. .1 looking
and ‘preferably of a circular outline is used, hav
toward the free edge of ‘the door.
Fig. '4 is an inside view ofthe latch structure 35 ing an inwardly extending annular ?ange II at
its edges, and at .its central portion being pressed
escutc'heon housing, between which and an in
outwardly to provide a central raised section l2.
side ;plate the major portion "of the latch mecha
A door knob ‘I3 is associated with the escutcheon,
nism is located, one of such structures being
said knob at its inner end riding against the
located at each side of a door.
Fig. 5 is a view similar to Fig. 4 with them 40 outer face of the raised portion l2 and having
the use of a screwdriver or like implement.
side plate removed.
Fig. 6 is a view similar to Fig. ‘5 with other
'at'its inner end a centrally disposed pin M which
passes ‘through a central opening in the part 12
and has riveted or otherwise permanently se
parts removed and illustrating the escutcheo'n
cured ‘at its inner end a ?at member [5, substan
and knob assembly unit.
Fig. '7 is a perspective view of such escutcheon 45 tially ‘of bell crank form, the outer end portions
of each arm of ‘which carry each a short pin i=6
housing and knob assembly unit. .
extending inwardly. It is evident that the knob
Fig. 3 is a perspective view of the inside plate
l3, the escutcheon housing, the bell crank mem
cooperating with the escutcheon and upon which
ber 15 and pins ‘I16 ‘may be assembled together
operative parts of the latch ‘mechanisms is mount
50 and provide a unit of the structure as shown in
ed, and
Fig. 7.
Fig. ‘9 is a perspective view of the latch bolt.
The escutc‘heon housing at its inner side and
Like reference characters refer to like parts
within ‘the ?ange II is closed by a substantially
in the di?erent ?gures of the drawings.
flat plate [1. The plate I‘! has a horizontal slot
The door I upon which the latch and lock of
my invention is installed may be of any conven 55 I18 therein closed at both ends and extending
4 .
across the center of the plate and located across
bell crank arm 28 from its locked position as in
the adjacent end of the transverse opening 3
through the door. At the outer side of the plate
I ‘I a member I9 stamped from ?at metal is lo
cated, which has two oppositely disposed arms
20 extending from its middle portion transverse
ly of the slot I8 and two oppositely disposed
longitudinal portions 2I and 22 which are located.
generally at right angles to the, arms 20. The
part 2| is guided through a rectangular opening
in a tongue 23 struck from the plate I1 and
turned at right angles thereto as shown in Figs. 3
Fig. 5 to its released position as in Fig. 4.
As shown in Figs. 4 and 8 in addition to the
and 8, serving as a guide for the movements of
the member
, .
An operating rod 24 is riveted to the member
I9 adjacent its central portion and extendsv
through the slot I 8 of the plate I'Lbeing enlarged
between its ends as shown at 25 thus securing
and holding the parts together but permitting a
freedom of movement of the member I9 and said
rod 212 in the direction of the length of the slot
removal of a part of the ?ange I I of the escutch- .
eon plate II] at 39, a notch 3| is cut in the ?ange
at another predetermined point and the plate I'I
provided with a projection 32 to ?t into said
notch, this for the purpose of controlling the loca
tion of the plate I1 and slot I8 and.v the member
59 at the outer side of the plate with reference
to‘the operating bell crank I5.
The latch construction described is simple and
economical to produce. Outside of the latch bolt
. and rods 24 and 26 substantially all metallic parts
There are two of the described structures
are stamped from sheet metal. The duplication
'of the mechanism at the inner and outer sides of
the doors results in economy of manufacture.
When completed the plate I ‘I is permanently
joined to the escutcheon I0 so that each knob
assembly is handled and installed as a single unit.
The latch bolt and its spring projection are simple
and economical in structure. The latch may be
used, one at each side of the door and the rods
24 extend inwardly through the transverse open
is not desirable, eliminating the rod 26 and its
installed on doors Where an inside locking'thereof
ing 3 at each end thereof being received at their 25 bell crank operating arms 28 and 29, while the
free inner ends in the transverse axial opening 9
application of the locking means is simple and
' made through the bolt 8,
With the construction as described one at each
easy and the locking means itself is of a simple '
economical structure.
side of the door and the assembled knob housing
The invention is de?ned in the appended claims
escutcheon plate It and inner plate I'I secured so and is to be considered comprehensive of all forms
to the door by means of screws or other equivalent
of structure coming within their scope.
fastenings (Fig. 3), it is evident that on turning
I claim:
a knob I3 at either side of the door in either direc
1. A latch construction including a housing
tion the associated member I9 will be moved lon
adapted to be inserted in an opening made in
gitudinally by reason of a pin IE on a bell crank
wardly at the vertical edge of the door, a coiled
I5 engaging against the outer edge of an arm
spring within said housing, a latch bolt‘ having
2!! of member I9 as shown in Fig. 5, thereby mov
a head normally projecting beyond the open end
ing the rod 24 inwardly and causing the latch bolt
of the housing and a stern connected to said
to :be retracted against the spring 5. The knob at
head passing through said spring and the bot
either side of the door may be turned in either 40 tom of the housing, said stem at its inner end
direction and such operations will follow because
portion having a transverse opening there
of the two‘pins I6 engaging one against each of
through, an operating pin having a free end por-,
the two arms 20.
tion extending partly into said opening'at each
There may be associated with. the latch struc
side of the latch bolt stem, means for mounting
ture as described a simple manually operable look
each of said pins ‘for a longitudinal movement
ing means. As shown in Fig. 8 the inside closure
paralleling the axis of said bolt stem, said
plate I‘! ‘of one of the assemblies has a rod 26
movement being in a direction to retract the
diametrically slotted at 21 at its free end. Said
bolt head and compress said spring, and manu
rod ispassed through the plate vI'I adjacent an
ally rockable means connected with each of said
edge thereof and carries a bell crank having two
pins for moving the same to retract the latch
arms 28 and 2%, the former of which may be
bolt on rocking either of said means in either
moved between the positions indicated in Fig. 4
direction of rocking movement.
and that shown in Fig. 5 in the former of which
2. A latch comprising, a spring actuated bolt,
the adjacent member I9 is free to move while in
said bolt having a head at its outer end and a
the latter, as shown in Fig. 5, the end of the arm . stem extending therefrom, said stem having a
28 has been brought into the path of movement of
transverse horizontal passage therethrough, said
‘ ‘one of the arms 2!! locking the associated member
bolt being adapted to be installed in a horizontal
I9 and other parts in connection therewith
cylindrical opening bored between the sides of
against movement. The arm 29 extends through
door at a free edge thereof, a‘housing adapt
an opening as shown at 30 made in the ?ange
ed to be secured at each side of the door, a plate
I I so that the bell crank lock is readily operated
at the inner side of each housing adapted to be
to either position by manual manipulation, said
against a side of_ the door, each of'said
arm 29 being freely accessible for such purpose.v
plates having a horizontal slot therein, a pin
In practice for example with a bathroom door,
extending through each of said slots and at its
it will be the inner assembly which is provided
with the rod 26 and the bell crank lock and op— ’ inner end extending into the transverse passage
through said bolt stem a‘ distance approximating
erating means therefor, the rod 26 extending
one-half the length of said passage, a member
through the door and its slotted end 2‘! through
to which each of said pins is connectedat its
the outside plate I‘! and substantially flush and
through an opening in the escutcheon plate III at 70 outer end slidably mounted at its outer ‘side to
each of said plates, a knob adapted to be rocked
the outer side of the door, with its slotted end
about a horizontal axis in either direction
substantially ?ush with said escutcheon housing
mounted at the outer side of each of said hous
Ii}. This exposes the slot at 21 so that in an
ings, and a member secured to the inner end por
emergency the slot may be engaged by a small
tion of each knob within its associated housing
screwdriver to turn the rod 26 and change the ‘
75 in operative engagement with the ?rst men
tioned member for slidably moving it in a direc
tion to retract the latch bolt upon rocking move
ment imparted to either of said knobs in either
3. A latch comprising a latch bolt having a
cylindrical housing open at its outer end, a
coiled spring within the housing, a latch bolt
having a head adapted to project beyond the
mounted at a free vertical edge of a door hav
ing a head normally projecting beyond said free
edge, said bolt being mounted for inward re
traction, identical means adapted to be mount
ed one at each side of the door including a plate
having a longitudinal slot therein adapted to be
located in parallelism to the direction of move
ment of the latch bolt, said latch bolt having
a transverse opening therethrough at its inner
through the bottom of said housing, said stem 10 end portion, inwardly extending pins mounted
one on each plate for slidable movement length
at its inner end portion having a transverse
wise of its slot, said pins at their inner ends
opening therethrough, two identical assemblies
entering the transverse opening through the
each comprising an escutcheon housing, a plate
latch bolt from opposite sides thereof, and man
closing the inner side thereof, said plate having
ually operable means associated and operatively
a slot therein adapted to parallel the axis of
connected with each of said pins for selectively
said bolt stem, a ?at metal member located
moving either of said pins lengthwise of the slot
against the outer side of the plate and means for
through which it passes to retract the latch bolt.
guiding the member in sliding movements over
5. A latch construction including a housing
said plate, a pin connected to each of said mem
adapted to be inserted inwardly at the vertical
bers extending through the slot in said plate,
edge of a door, a coiled spring within said hous
said pins being adapted to enter said passage
ing, a latch bolt having a head normally pro
through said bolt stem, a knob outside of the
jecting beyond the open end of the housing and
housing having a centrally disposed pin at its
a stem connected to said head passing through
inner end passing through said housing and
said spring and the bottom of the housing, said
rockable about a horizontal axis, a bell crank
open end of the housing and a stem extending
connected to the inner end of the last men
tioned pin, additional pins one at the outer end
of each arm of the bell crank, said slidable mem
ber having oppositely extending arms against
an edge of each of which arms one of the last
mentioned pins bears, whereby when said assem
blies are connected to opposite sides of a door
and the latch bolt is mounted on the door be
stem at its inner end portion having a trans
verse opening therein, an operating pin having a
free end portion extending partly into said open
ing, means for mounting said pin having lon
gitudinal movement paralleling the axis of said
bolt stem, said movement being in a direction to
retract the bolt head and compress said spring,
and manually rockable means connected with
said pin for moving the same to retract the
tween the opposite sides thereof, the bolt may
be retracted in rocking either knob in either 35 latch bolt on rocking said means in either direc
4. A spring actuated latch bolt adapted to be
tion of rocking movement.
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