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Патент USA US2547260

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April 3, 1951
R. c. CERF, JR
File-d Dec. 50, l948
2 Sheets-Sheet l
April 3, 1951
R. c. CERF, JR
Filed Dec. 50, 1948
2 Sheets-«Sheet 2
FIG. 6..
65 50
63 D
Patented Àpr. ‘3, 195i
Robert' Cif/Cerf, Jr., Los Angeles, Calif'.,_ assì‘grror
toV Hollyma‘de Hardware ManufacturingA Com-'
.panyg Los'Angeles; Calif., a corporation ofïG'ali
ApplicationDecember 30, 1948„Seri`allN`o» 682213v
3 Claims;
'.Iïël'iis- invention relates to a door knob latch' set
and in particular. to an improved non-locking
knob operated. “through door” latch set..
Oneobject of theA invention is to provide an >irn
proved'non-locking door knob latch Set. Another
Objectis to provide a door knob latch set which
is adaptable to- lit doors of. different thickness.
Another object is to .provide meansin a door knob
latch set for equalizing the protruding lengthv of
theknob spindles. on thetwosides of the door ir
respective of thethickness of the-door.
These and other objectsare attained byv my in
vention which will be understoodfromthe follow
ing description,.reference being-madeV to theac
companying drawings in which: l
Figure 1 is- a top planY view, partly in- section,
show-ing a- preferred form of my invention;
Figure 2fis-across-sectional View taken on the
line«2-2 of Figureîl;
Figure 3 is a cross-sectional» view taken on~the
linef3-3 of Figure 1-;
Figure 4 is a cross-sectionalview- taken on» the
line 4-4`of Figure -1;
Figure 5~is. a cross-sectional view takenv on-the
line 5-5 of» Figure 2;
Figure 6 isa cross-sectional view` taken on the
line `6_6 of- Figure2;
Figure '7 is an enlarged cross-sectional. view
showing the rotatably 'attached- end of theequal
Figure 8 is a- perspective view. showingthe knob
andzspindle assembly;
Figurefgî. is a~ perspective-view show-ing a. half
portion of the retractor housing; and
FigurelO isaperspective View showingthe op
positeihalf-retractorA housing.
The» preferred for-m. of my invention. shown in
the.. dra-wings consists of a die-cast. cylindrical
body I.I made in. right and left half portionsÍ I3
and.. I2 which- are adapted to be fastened together
by. the. assembly. screws I4 whose. heads. are
countersunkl in> the countersunk holes I5 of the
right half portion . I v3- andfwhichare .threaded into
the threaded assembly holes Ißlintheleft'half'
portionlztofor-m thecylindricalbody I.I. The
cylindrical body half. portions. I2 and. I3. areeach
provided with abearing hub IA-'I> in which the. knob
spindles I 8. are mountedrfor. turning. The hubs
areleachprovided~with..a.retaining. key slot I
cylindrical body“l Il I* is arranged with guide- ridges
25 for the longitudinal' movement of a retractor
26v ha‘ving‘ a thrust‘plat'epartition 2l. The gen
« erally’rectangular shaped retractor‘is'mounted; to
slide on the pin 28 which` is clamped> at one end
between thev pin bosses 3'I of the two half portions
I"2‘ and I3" i'n the half cylindrical grooves- [email protected] and
projects into the cavity ofv thev body I"I. A coil
compressiorrspring“ 3l! is' provided around' thepin,
one endï abutting _the pin'k bosses 3"'I` andy the4 other
end abutting the underside of the thrust plate
partition 21" of` the retractor'Z’t so that the re
tractor is normally thrust outwardly with the
y lingers 32pr‘otrudin‘g`sli'ghtly through theperiph
eral wind`ow'33`in the wall'o‘f'the cylindrical body
The fingers 32' are> adapte'djto'. engage'the latch
bar under the lugs. ílflinv the end ofl the latch bar
35, so“ that' the latch’ bolt maybe depressed with»
out actuation. of`~ the retract'or orA knobs; The
latch bar 35" extends from> the latch bolt 35F which
is? arranged’ to slide within the cylindrical latch
bolt; casing 31 which is mounted in a bored hole
in> the edge` of' the door Dj by mounting screws
(not shownû‘ in the end plate' 381 Thek opposite
end of the. casing 3l is attached by the'lugs 39
which> extend from the endclosure plate ‘302 The
lugs- 3.9 are arranged to slide'under the' margins
4I of theV peripheral window 33 in the‘cylindri'c'al
body II, with the‘endï walls"42` of the' latch bolt
casing 3'!` abutting the outside face of the margins
4I. This arrangement permits` adjusting the
position of thelatch bolt'ca‘sing longitudinally of
the cylindrical bodyv II- which adjustment is de
sirable.v and' necessary when the holes drilled in
the door- in which the set is‘ to be installed are
not' symmetrically located or not accurately
aligned". This‘adjustability also permits the cent
ering. of’ the' latch bolt in the edge of the door
40 regardless of its thickness and irrespective of the
longitudinal positioning of the' body EIV in its
mounting 'hole in th'eïdoor;
The retractor' 26 is actuated> by rollbacks 44
arranged on the inner ends of the spindles I8. A
rollback. is formedv by cutting away about one
half off the periphery‘of. the tubular spindle at
the freev or'inner end ofthe spindle, for a short
distance back from the end ofi the spindle, the
longitudinal'. edges of'theremainin'g half cylinder
jacentabosslll` at the. end of. the respectivecylin 50 pressing upon the thrust plate partition 2l alter
drical. half; portions, I2. and. I'3,-. each.. of: which
nately depending upon they direction of rotation
is.. arranged to. holdv a hair pin. spring 2I
of.' the knobs 45. Each tubular spindle I8 is pro
which. is attached; to the body. portion. in. a
vided with a peripheral key slbtï4ä" extending,
radial. groove. 22,` by- a. headedï screw. 23'. in. p
forA example,.,one-halïîthe circumference of the
a threaded Hole 24’. The hollow'i'nterior of the 55 spindle, which key' slot'is adapted‘tö'be engaged
by the retainer keys 4'I which ñt in the retainer
key slots I9 and are normally held in the slot by
the hair pin springs 2| in the holes 49 through
the keys. The slots are made long enough to per
mit the desired turning of the knobs to effect
retraction of the latch bolt. The spindle I8 is
attached in any suitable manner to the knob 45,
which is preferably provided with a finish hub 48
which telescopes over the spindle for a portion
of its length adjacent the knob.
The cylindrical body II is adapted to be
mounted in the door in a drilled hole through the
door connecting with the smaller hole bored at
right angles thereto from the edge of the door for
the latch bolt casing. The cylindrical body II is
held in place within the hole in the door by an
attached clamping plate 50 on one side of the
hole and a loose clamping plate 5I on the oppo
site side, the clamping plates being larger than
the hole so that they engage the margins. The
attached clamping plate 5i! is movable relative
to the end of the cylindrical body by means of
long headed screws 54 which are rotatably at
tached in the holes 55 in the plate 50 by means
of a washer 56 over which the end 53 of the screw -
54 is riveted. The screws 54 are engaged in the
threaded holes 51 in the left half portion I2 of the
»cylindrical body I I, extension bosses 58 being pro
vided on the end of the cylindrical body. The
unthreaded portion of the long headed screws 54 '
is adapted to turn freely in the holes 59 in the
right hand‘shalf portion of the cylindrical body,
the knobs extend on their spindles for equal dis
tances from the door on the two sides. By means
of the adjustment of the position of the attached
clamping plate 50, the cylindrical body may be
centered in the mounting hole in the door. When
the removable clamping plate 5I is then attached
on the opposite side by the screws 62, the spindles
and knobs extend for equal distances from the
door faces. The retractor is independently op
erated by the rollbacks on both spindles so that
only one knob is turned in retracting the latch
bolt. The bolt is free to be depressed without
actuating the retractor or knob mechanism. The
knob and attached spindles may be removed from
either side of the door independently of the knob
and spindle on the opposite side and if desired,
one knob may be left off entirely and a plate
rosette may be used to cover the unused spindle
opening. By making the cylindrical body by die
casting to accurate mold dimensions, the assem
bly is rigid, and the knobs are accurately aligned
in the long bearing hubs so that even after long
use, the knobs and spindle do not wobble. In
the preferred construction shown, no mounting
screws for either the knobs or for the body are
visible from the sides of the doors, thus provid
ing a neat appearance, avoiding the showing of
screw heads, and preventing unwarranted tam
pering with the knob set.
l. In a door knob latch set having a cylindri
cal body adapted to be mounted in a bored hole
in a door, with bearing sleeves, spindles and at
tached knobs extending from opposite ends of
said body; means to clamp said body to a door
set. A shoulder 60 under the head limits the out
in which it is mounted comprising a pair of
ward movement thereof, corresponding to the
clamping plates, each having an axial hole and
maximum extension of the clamping plate 50
being adapted for sliding longitudinally on said
from the cylindrical body I I.
bearing sleeves, said plates being larger than said
The other clamping plate 5I is removably at
body and one of said plates being permanently
tached to the right hand half portion I3 by 40 attached to one end of said body but adjustably
means of screws 62 in the threaded holes 63 in
spaced away axially from said body by means
the end of the right portion of the cylindrical
accessible only from the opposite end of said
body I3, the heads or" the screws 62 holding the
body; and means for attaching said other clamp
clamping plate 5I against the wood of the door
ing plate to the opposite end of said body.
bordering the hole in which the cylindrical body Bh 2. In a door knob latch set having a cylin
is mounted.
drical body adapted to be mounted in a bored
Rosettes 65 having turned rims 66 which are
hole in a door, with spindles and attached knobs
arranged te frictionally engage the outer edges of
extending from opposite sides thereof; means to
the clamping plates 5I] and 5I are provided, these
clamp said body to a door in which it is mounted
rosettes being also provided with sleeves 61 which
comprising a pair of clamping plates each having
telescope over the hubs 48 of the knobs 45, com
an axial hole for a spindle, said plates being
pletely covering the spindles regardless of the
larger than said body, one of said plates being
extent of protrusion from the door faces.
perm-anently attached but adjustably spaced
The spindles and attached knobs on both sides
away from said body; and means for attaching
of the door are releasable from the respective
and spacing said attached clamping plate con
sides of the door by first releasing the friction
sisting of spacing screws mounted in threaded
ally held rosette and further telescoping its sleeve
holes in said body, the headed ends of said screws
over the hub of the knob to gain access to the
being accessible from the end of said body op
retainer key 41 through the window 52 of the
posite said attached clamping plate, the other
clamping plate. By means of a screw driver or
ends of said screws being rotatably held in said
similar tool, the retainer key II'I is raised, which
attached clamping plate; the other clamping
releases it from the peripheral key slot 4B in the
plate being held in clamping relation with said
spindle I8 so that the knob and spindle may be
first clamping plate by screws in threaded holes
withdrawn from the bearing hub I'I.
in the end of said body.
The means for clamping the cylindrical body
3.' In a door knob latch set having a cylin
to the door at the margins of the clamping plates
drical body adapted to be mounted in a bored
so that their positioning may be adjusted from
hole in a door, with bearing sleeves, spindles and
one side in order to equalize the protrusion of
attached knobs extending from opposite ends of
the knobs may be utilized on doorknob sets hav
said body; means to clamp said body to a door in
ing other latch retraoting means and/or locking
which it is mounted comprising a pair of clamp
the end of the screws being slotted so that they
may be turned from the right hand side of the
«The advantages of my invention will be appar
ent. At the time of installation, knob latch sets
must be readily adjustable for use on doors of
different thicknesses and it is desirable to have
ing plates, each having an axial hole and being
adapted for sliding longitudinally on said bear
ing sleeves, said plates being larger thanv said
75 body and one of said plates being permanently
attached to one end of said body but adjustably
spaced away axially from said body by attaching
The following references are of record in the
screws swivel-attached at one end to said plate,
file of this patent:
said screws being threadedly engaged in threaded
holes in said body, the unattached ends of said 5
screws being accessible only from the end of said
body opposite said attached plate; and screw
Voight __________ __ Feb. 20,V 1906
means for attaching lsaid other clamping plate to
the opposite end of said body.
Collins et a1 _______ __ June 12, 1917
-Sohlage __;'_ ...... __ Sept. 6, 1932
Gold ____________ __ May 8, 1934
McKinney'...... __ May 28, 1935
Grimsrud ________ _- Apr. 6, 1937
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