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Патент USA US3073650

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Jan. 15, 1963
’
5. G. MOBURNIE
3,073,640
LATCH SET _
Filed June 28, 1960
3 Sheets-Sheet 1
l2
’
I08
mun/r02
STUART G-
M‘BURNIE
8r
JMM
HTTORAIEVI &
Jan. v15, 1963
s. G. MOBURNIE
3,073,640
LATCH SET
Filed June 28, 1960
3 Sheets-Sheet 2
68/ LIZB
98
M/Vt'A/TOR
STUART
G.
M‘BURNIE
Jan. 15, 1963
s. G. MGBURNIE
LATCH SET
Filed June 28, 1960
3,073,640
"
3 Sheets-Sheet 3
mvn/rok
STUART G.
M5 BURNIE
By
Wad
” T'TOR/VEW
B???dll
“em.I
I
Patented Jan. 15, 1963
2
to ‘drill a fairly large hole 17 transversely through the
door spaced inwardly from edge 12 and at a level where
3,073,640
LATCH SET
it is desired to have the door knobs. A smaller passage
13 is drilled in the door inwardly from edge 12 thereof
to hole 17 substantially in line with the longitudinal axis
gtuart G. Mciiurnie, Box 383, Westview,
British Qolumbia, Canada
Filed (lune 28, 1960, Ser. No. 39,261
of the latter hole.
12 Elairns. (Cl. 292-254)
This invention relates to latch sets particularly for in—
‘
A preferred form of latch set 20 is mounted in door 10
and jamb 11. The latch set 29 includes a latch plate 25
mounted on door edge 12. This plate preferably is
side doors, but which may be made for outer doors as
well.
10 countersunk into the door edge so that its outer face 26
An object of the present invention is the provision of
a latch set which does not require any lubrication, and
is silent in operation.
'
Another object is the provision of a latch set which
cannot be opened from the outside with a knife blade or
similar article.
A further object is the provision of a latch set which
does not have any protruding parts, such as the strike
plate of latches now in common use; thereby eliminating
the possibility of catching clothing.
A further object is the provision of a latch set which
requires very little movement for operation, and yet holds
a door securely closed.
is ?ush with edge 12. Plate 25 is relatively thick, and
is preferably formed of a suitable plastic. This plate has
a bore 28 extending therethrough. A stop is ‘mounted on
or formed in latch plate 25. In this example, the stop
5 is in the form of a shoulder 30 formed by a notch 31 in
said plate. It will be noted that stop 30 is close to bore
28 and faces substantially towards the inner face 15 of
the door.
A keeper 36 is mounted on door jamb 11 opposite latch
plate 25 when door 10 is closed. This keeper is normally
biased outwardly of the jamb and engages stop 30 to keep
the door closed.
-
which may be locked from one side of a door, and nor- 4
In the preferred form of the invention, keeper 36 is
hingedly mounted in a housing 38 mounted on jamb 11.
This housing is preferably recessed into the jamb so that
mally cannot be unlocked from the other door side, and
its outer face 39 is flush with the bottom 4-0 of notch 13.
yet in an emergency can be unlocked from said other side.
Housing 38 is preferably formed from a relatively thick
piece of suitable plastic material, and keeper 36 also is
preferably made out of plastic material. Housing 38
A still further object is the provision of a latch set
A still further object is the provision of a device of the
nature described which may be made in different colors,
and may be planed or sanded to make a perfect ?ush 30 has an interior 42 in which the keeper is located. Keeper
?tting within a door and a door jarnb.
36 includes hinge means in the form of a pintle 44 intee
grally formed therewith and projecting above and below
With ‘these and other objects in view, a latch set ac
cording to the present invention comprises, in combina
tion, a latch plate adapted to be mounted on an edge of
a door, a stop on the latch plate, a keeper adapted to be
mounted on a'door jamb opposite the latch plate when
the door is closed, said keeper being normally biased out
wardly of the jamb and engaging said stop of the closed
door to keep the latter closed, pressure means at the
the keeper, as clearly shown in FIGURES 3 and 7. The
ends of pintle 44 ?t into grooves 45 ‘and 46 formed at
the top and bottom of the interior 42 of housing 38, said
grooves extending inwardly from the rear surface 47 of
housing 38, but terminating short of the outer face 39
thereof. Means is provided for normally resiliently swing
ing keeper 36 outwardly of housing 38. This may be
latch plate operable to disengage the keeper from the stop 40 done by means of a suitable spring, but in this example,
to release the door, and knob means at the pressure means
to operate said pressure means to disengage the keeper.
An example of this invention is illustrated in the ac
companying drawings, in which,
a piece of soft rubber 50 is located in the housing behind
the keeper so that the latter may be swung into the hous
ing only by depressing this rubber, as shown in FIGURE
8. The rubber normally keeps the keeper projecting out
FIGURE 1 illustrates a portion of a door and a door 45 wardly from housing 38, as shown in FIGURE 2.
jamb, showing the inner knob of the latch set in elevation,
FIGURE 2 is a horizontal section through the latch
Suit
able stop means is provided for limiting the outward
swinging movement of the keeper. This may be accom
plished by providing a stop surface 53 in housing 38 ad
set taken substantially on the line 2—2 of FIGURE 1,
jacent the keeper pintle 44. The adjacent edge of the
FIGURE 3 is a vertical section through the set taken on
the line 3--3 of FIGURE 2,
50 keeper abuts against stop surface 53 when the keeper
swings outwardly a predetermined distance.
.
FIGURE 4 is a fragmentary sectional view taken on
the line 4—4 of FIGURE 2,
Pressure means is provided in set 2d at latch plate 25
which is operable to disengage keeper 36 from stop 30‘
FIGURE 5 is a cross section taken on the line 5-5
of FIGURE 2,
to release door 10. In addition to this, knob means is
provided at the pressure means to operate said pressure
FIGURE 6 is a vertical section taken on the line 6—6
of FIGURE 2,
means to disengage the keeper.
FIGURE 7 is a view similar to FIGURE 3, illustrating
the unlatching action of the set,
FIGURE 8 is a section taken substantially on the line
pressure means is in the form of a pin 55 slidably mounted
In this example, the
in bore 28 of latch plate 25 and extending inwardly
through passage 18 of door 10. This pin is formed with
8-8 of FIGURE 7,
60 or has connected thereto a yoke 57 having a pair of free
FIGURE 9 is a fragmentary perspective view of part
ends 58 and 59. Suitable means is provided for normally
of the set that is mounted in a door,
urging pin 55 inwardly of the door, and this may be
FIGURE 10 is a perspective view of the portion of the
in the form of a coil spring 62 around the pin and hear
set to be mounted in a door jamb, and
ing ‘against latch plate 25 land a shoulder 63 formed by
FIGURE 11 is an enlarged section taken on the line 65 yoke 57.
11-11 of FIGURE 10.
A shaft 68 extends through hole 17 in door 10‘ and
Referring to the drawings, 10 is a door mounted within
transversely of said door. In some forms of the inven
a ‘door jam-b 11. When the door is closed, the vertical
tion, this shaft may be solid and formed plastic or other
edge 12 thereof ?ts in a notch 13 formed on the jamb
suitable material, but in this example, the shaft is in the
by a vertical stop strip 14 secured to said jamb. Door 70 form of a tube formed of metal for the sake of strength,
10 has an inner face 15 and an outer face 16. In order
although a plastic tube may be used. The ends 58 and
to prepare the door for the latch set, it is only necessary
59 of yoke 57 span shaft 68 substantially midway be
3,073,640
4
tween the ends therof. An annular block 72 surrounds
shaft 68 and is connected thereto in any suitable manner,
For example, it may be used on bathroom doors since
the door is locked merely by moving cap 123 on the
such ‘as a screw 73.
handle means 12$ to move lugs 126 and 127 to their
This block has a slot 75 therein
into which yoke 57 extends, see FIGURES 3, 7 and 8.
outer positions, at which time, shaft 63 cannot be rotated
Slot 75 has ends 79 and 36 adjacent yoke ends 58 and
59 respectively, which act as projections from shaft 68
so that keeper 36 cannot be dislodged from stop 39. The
latch set is improved for this purpose by providing means
for unlocking it from outside the door in an emergency,
to press against said ends on rotation of the shaft in
such as when a young child locks himself in and becomes
either direction to move pin 55 outwardly to disengage the
too frightened to operate the lock, or a person becomes
keeper 36 from stop 39. If shaft 63‘ were formed of plas
tic material, block 72 could be made integral therewith.
10 incapacitated and cannot release himself. For this pur
pose, locking arm 115 may be provided with an extension
A pair of escutcheon plates 34 and 35 slida'uly fit on
or outer handle means 137 within shaft 68 and extending
towards outer knob 98. A small hole 139 is formed in
shaft 68. These plates are large enough to cover hole
17 in the door, and they are preferably made out of a
knob 98 and the adjacent portion of shaft 68, said hole
suitable plastic material. These plates are held in place
against the faces of the door by a plurality of screws 87 15 being aligned with arm extension 137. If it becomes
impossible for a person on the inside of the door to un~
which extend through one plate, for example, plate 84,
lock the latch set, a small instrument may be inserted in
and are threaded into the other plate, plate 85, see FIG
hole 139 to move extension 137 to shift lugs 126 and
URES 2, 3 and 7. If desired, a pair of face plates 3%‘
127 to their inner positions, at which time, shaft 68 may
and 90 are slidably mounted on shaft 7 8 outside escutch
be rotated to open the door.
eon plates 84 and 85, respectively. These face plates
The operation of latch set 2% is very simple. Shaft 68
cover the ends of screws 87. If desired, plates 89‘ and 99
may be rotated by turning either knob 98 or 99. This
may be formed with inwardly-projecting pins 92 and 93
causes either projection 79 or 80 to bear against yoke
which ?t into corresponding notches 94 and 95 in plates
end 58 or 5% to move pin 55 outwardly through latch
84 and 85 is order to keep said face plates from rotating.
Knobs 98 and 99 are mounted on the ends of shaft 68 25 plate 25 against the pressure of spring 62. The outer
end of the pin engages keeper 36 and swings it clear of
in any convenient manner, such as by set screws 161
step 30 against rubber 50. As soon as the keeper clears
and 102, see FIGURE 2. If desired, outer knob 98 may
the stop, and very little movement is required to do this,
be permanently secured to the shaft in any convenient
the door may be swung open. As soon as the door clears
manner, such as gluing, or by riveting. Knobs $8 and 99
are preferably formed of ‘a suitable plastic. This makes 30 the keeper, it returns to its normal outwardly-extending
position. At this time, the outer surface of the keeper
it possible to produce a variety of different shapes, and
is inclined relative to the outer face of the door so that
to produce knobs of many different colors. Similarly,
when the door is closed, it engages the keeper and moves
the face plates and/or escutcheon plates may be of any
along this inclined surface, which action swings the
desired color. For the sake of convenience in molding
and in order to save material, knobs 98 and 99 may be 35 keeper back into its housing 38. As soon as the vertical
edge of the keeper clears stop or shoulder 30, the keeper
hollow, :as indicated at 105 and 166. In this case, the
swings into notch 31 and engates the stop to hold the door
outer ends are closed by covers 103 and 109 which ?t
snugly within said ends. Knobs 98 and 99 are also
closed.
The construction of latch set 20 is very simple and lends
formed with suitably shaped passages 110 and 111 into
itself to the use of plastics. As there is extremely little
which the ends of shaft 68 snugly ?t. The knobs extend
friction involved, no lubrication is required. Further
along the shaft up to face plates 89 and 90, and, there
more, the latch set operates without any noise such as is
fore, retain these plates in position.
experienced with the latch sets in common use today.
The latch set described so far may be used in doors
The use of plastics makes it possible to make the set in
‘that do not need to be locked or have other locking
many different colors, and the various elements thereof,
means. However, if desired, latch set 29 may be provided
with its own locking means.
and particularly latch plate 25 and housing 38, may be
A locking arm 115 is located in and extends longitudi
nally of hollow shaft 68. This arm is pivotally mounted
in the shaft in any convenient manner. In this example,
sanded or planed to make them ?ush with the surfaces in
which they are mounted. The use of plastics eliminates
rust or deterioration, and the set will not be affected by
set screw 73 of block '72‘ is provided with an extension 50 changing temperature and atmospheric conditions.
117 within shaft 68 and upon which arm 115 is swingably
What I claim as my invention is:
mounted. Extension 117 is in the form of a pin having
1. A latch set comprising, in combination, a latch plate
a groove 118 therein into which arm 115 ?ts. This arm
adapted to be mounted on an edge of a door, a stop on the
latch plate, a keeper adapted to be mounted on a door
is provided with inner handle means 120‘ which in this
example, is actually a prolongation of the arm. This 55 jamb opposite the latch plate when the door is closed,
handle means or arm extends through a slot 122 of cover
said keeper being normally biased outwardly of the jamb
109 of inner knob 99. A cap 123 is mounted on the
‘outer end of the arm and frictionally engages the outer
surface of cover 109 to retain the locking arm in any
and engaging said stop of the closed door to keep the lat
ter closed, pressure means at the latch plate operable to
set position.
Locking arm 115 has one or more locking lugs pro
disengage the keeper from the stop to release the door,
60
a hollow shaft adapted to extend transversely through a
door adjacent the pressure means, means on the shaft to
operate said pressure means on rotation of the shaft to
jecting outwardly therefrom. The illustrated arm has
disengage the keeper, knobs on the ends of the shaft,
lugs 126 and 127 projecting outwardly from the upper
a locking arm pivotally mounted in the shaft and extend
and lower edges thereof and through holes 123- and 129
formed in shaft 68. It will be noted that lugs 126 and 65 ing longitudinally thereof, handle means connected to the
arm and extending out of the shaft, a lug on the arm
127 are on opposite sides of pivot pin 117 so that arm
aligned with a hole in the shaft, said lug being movable
115 may be swung to move the lugs outwardly through
from an outer position projecting from the shaft to an
their respective shaft holes, and inwardly to retract the
inner position by movement of the arm by the handle
lugs within the shaft. When lugs 126 and 127 are in
means about the pivot mounting of said arm, and sta
their outer positions, as shown in FIGURE 6 they project
tionary means adjacent the shaft and the lug for receiving
into recesses 132 and 133 formed in escutcheon plates 85
said lug when in its outer position to prevent rotation of
and 84, respectively, so that these plates act as stationary
the shaft.
means adjacent shaft 68 for receiving the lugs to prevent
rotation of the shaft.
2. A latch set comprising, in combination, a latch plate
Latch set 20 may be used on inside or outer doors. 75 adapted to be mounted on an edge of a door, a stop on the,
3,073,646) _
5
6
latch plate, a keeper adapted to be mounted on a door
6. A latch set comprising, in combination, a latch plate
jamb opposite the latch plate when the door is closed,_said
keeper being normally biased outwardly of the jamb and
adapted to be mounted on an edge of a door and having
outer and inner edges adjacent outer and inner faces of
engaging said stop of the closed door to keep the latter
closed, pressure means at the latch plate operable to dis
engage the keeper from the stop to release the door, a
hollow shaft adapted to extend transversely through a
said door, said plate having a notch therein and opening
outwardly of the door edge, a stop shoulder in the plate
door adjacent the pressure means, means on the shaft
to operate said pressure means on rotation of the shaft to
within and at the bottom of said notch and inclined to
face towards the plate inner edge, a short keeper adapted
to be mounted on a door jamb opposite the latch plate
when the door is closed, said keeper being hingedly mount
disengage the keeper, knobs on the ends of the shaft, a 10 ed and swingable towards and away from the latch plate
locking arm pivotally mounted in the shaft and extending
and having an outer edge ?tting in said notch and in
longitudinally thereof, inner handle means connected to
the arm and extending out of the shaft near one end there
of, outer handle means connected to the arm within the
clined to engage said inclined stop shoulder and bearing
against the bottom of said notch of the closed door to
keep the latter closed, said keeper having an inner sur
shaft near the opposite end thereof, a small ?rst hole in 15 face normally inclined to the latch plate and facing the
the shaft aligned with said outer handle means, a lug on
outer edge of said plate to present an inwardly-inclined
the arm aligned with a second hole in the shaft, said lug
surface towards the outer face of the door when the lat
being movable from an outer position projecting from the
ter is closed, a pin slidably mounted in the latch plate
shaft to an inner position by movement of the arm about
and extending inwardly therefrom relative to the door,
the pivot mounting thereof, and stationary means adja~ 20 said pin having an outer end near the stop shoulder and
cent the shaft and the lug for receiving said lug when in
being aligned with the keeper in engagement with said
its outer position to prevent rotation of the shaft, said
shoulder, and knob means at the opposite end of the pin
arm being movable either by the inner handle means or
for moving said pin outwardly to disengage the keeper
through the outer handle means by a small instrument in
from the stop shoulder.
serted through said ?rst hole.
7. A latch set as claimed in claim 5 in which the latch
25
3. A latch set comprising, in combination, a latch plate
plate, pin and keeper are formed of plastic to eliminate
adapted to be mounted on an edge of a door, a stop on
the latch plate, a keeper adapted to be mounted on a door
noise.
8. A latch set comprising, in combination, a latch plate
jamb opposite the latch plate when the door is closed, said
adapted to be mounted on an edge of a door, a stop on the
keeper being normally biased outwardly of the jamb and 30 latch plate, a housing adapted to be mounted on a door
engaging said stop of the closed door to keep the latter
jamb opposite the latch plate when the door is closed
closed, pressure means at the latch plate operable to dis
and opening towards said plate, a keeper having inner
engage the keeper from the stop to release the door, a
and outer edges hingedly mounted in said housing and
hollow shaft adapted to extend transversely through a
swingable towards and away from the latch plate, a pintle
door adjacent the pressure means, means on the shaft to 35 on the keeper at the inner edge thereof and projecting
operate said pressure means on rotation of the shaft to
above and below the keeper, slots in the housing in which
disengage the keeper, knobs on the ends of the shaft, a
the pintle ?ts, a resilient pad in the. housing and beneath
locking arm pivotally mounted in the shaft and extending
the keeper and extending from near the keeper pintle to—
longitudinally thereof and out through one of the knobs,
wards the keeper outer edge, said pad bearing against the
a lug on the arm aligned with a hole in the shaft, said lug 40 keeper normally to urge said keeper outwardly towards
being movable from an outer position projecting from the
the latch plate, stop means limiting the outward move
shaft to an inner position by movement of the arm about
ment of the keeper, the outer edge of said keeper engaging
the pivot mounting thereof, and stationary means adja
the stop of the closed door to keep the latter closed, pres
cent the shaft and the lug for receiving said lug when
sure means at the latch plate operable to disengage the
45 keeper from the stop to release the door, and knob means
in its outer position to prevent rotation of the shaft.
4. A latch set as claimed in claim 3 including an ex
tension of the arm towards the end of the shaft opposite
the end carrying the knob through which the arm ex
tends, and a small hole in the shaft aligned with said arm
extension whereby a small instrument may be inserted
into said hole to move the extension and the arm to shift
the lug to the inner position thereof.
5. A latch set comprising, in combination, a latch plate
adapted to be mounted on an edge of a door and having
at the pressure means to operate said pressure means to
disengage the keeper.
9. A latch set comprising, in combination, a latch plate
adapted to be mounted on an edge of a door and having
outer and inner edges adjacent outer and inner faces of
said door, said plate having a notch therein and opening
outwardly of the door edge, a stop shoulder in- the plate
within and at the bottom of said notch and inclined to
outer and inner edges adjacent outer and inner faces of 55 face towards the plate inner edge, a housing adapted to be
said door, said plate having a notch therein and opening
outwardly of the door edge, a stop shoulder in the plate
within and at the bottom of said notch and inclined to
mounted on a door jamb opposite the latch plate when
the door is closed and opening towards said plate, a short
with said shoulder, and knob means at the opposite end 'of
face of the door when the latter is closed, pressure means
keeper having inner and outer edges hingedly mounted in
said
housing and swingable towards and away from the
face towards the plate inner edge, a short keeper adapted
to be mounted on a door jamb opposite the latch plate 60 latch plate, a pintle on the keeper adjacent the inner edge
thereof and projecting above and below the keeper, slots
when the door is closed, said keeper being normally biased
in the housing in which the pintle ?ts, a resilient pad in
outwardly of the jamb and having an outer edge ?tting
the housing and beneath the keeper and extending from
in said notch and inclined to engage said inclined stop
near the keeper pintle towards the keeper outer edge,
shoulder and bearing against the bottom of said notch
of the closed door to keep the latter closed, said keeper 65 said pad bearing against the keeper normally to urge said
keeper outwardly towards the latch plate, the outer edge
having an inner surface normally inclined to the latch
of said keeper ?tting in said notch and inclined to engage
plate and facing the outer edge of said plate to present an
the inclined stop shoulder and bearing against the bottom
inwardly-inclined surface towards the outer face of the
of said notch of the closed door to keep the latter closed,
door when the latter is closed, a pin slidably mounted in
the latch plate and extending inwardly therefrom relative 70 said keeper having an inner surface normally inclined to
to the door, said pin having an outer end near the stop
the latch plate and facing the outer edge of said plate
shoulder and being aligned with the keeper in engagement
to present an inwardly-inclined surface towards the outer
the pin for moving said pin outwardly to disengage the
at the latch plate operable to disengage the keeper from
keeper from the stop shoulder.
75 the stop shoulder to release the door, and knob means at
7
8
,
10. A latch set comprising, in combination, a latch plate
for engaging the yoke on rotation of the shaft in either
direction to move the pin to disengage the keeper from
the stop.
adapted to be mounted on an edge of a door, a stop on
the latch plate, a keeper adapted to be mounted on a door
spring surrounding the bolt and extending between the
jamb opposite the latch plate when the door is closed,
latch plate and a shoulder formed on the yoke to keep
the pressure means to operate said pressure means to
disengage the keeper.
11. A latch set as claimed in claim 10 including a
the latter in the block slot.
said keeper being normally biased outwardly of the jamb
12. A latch set as claimed in claim 10 in which the
and engaging said stop of the closed door to keep the
latch plate, keeper, pin, yoke and block are formed of
latter closed, a pin slidably mounted in the latch plate
and extending inwardly therefrom relative to the door, 10 plastic to eliminate noise.
said pin having an outer end near the stop and being
aligned with the keeper in engagement with the stop,
a shaft adapted to extend transversely through a relative
ly larger hole in a door adjacent the opposite end of
the pin, a large annular block ?xed to and surrounding 15
the shaft within said large hole and having a slot there
in aligned with the pin, a yoke on said opposite end of the
pin and slidably ?tting in the block slot, spaced escutcheon
plates on the shaft large enough to cover the door hole,
screws extending through one escutcheon plate and
threaded into the other to hold said plates against opposite
faces of the door and to support the shaft in the door
hole, shoulders formed on the block in the block slot
References tCited in the ?le of this patent
UNITED STATES PATENTS
120,419
343,348
1,791,029
2,238,066
2,499,165
2,655,398
Crossman et a1 ________ .._ Oct. 31,
Taylor _______________ __ June 8,
Hurd _______________ __ Feb. 3,
Mantz _______________ _._ Apr. 15,
Roethel ______________ .... Feb. 28,
Birbaum _____________ __ Oct. 13,
FOREIGN PATENTS
476,167
1871
1886
1931
1941
1950
1953
.
Canada ______________ __ Aug. 14, 1951
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