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Патент USA US2128439

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Aug. '30,‘ 1938.
2,128,439
O. STINSON
DOOR LATCH
Filed May 24, _l957
INVENTUR
OLIVER STI NSON
A TTORNE Y
2,128,439
Patented Aug. 30, 1938
urrao s'rAras ' ATENT OFFlCE
I 2,128,439
DOOR LATCH
Oliver Stinson, Edgewater, 0010., assignor to The
'
Robbins Incubator Company, Edgewatcr, 0010.,
a corporation of Colorado
Application May .24, 1937, Serial No. 144,421
(Cl. 292-48)
4 Claims.
This invention relates to improvements in door
latches or locks.
.
‘
_
In large refrigerators, incubators and similar
apparatus, it is necessary to provide means for
5» latching the doors in such a way that they will
be positively held in closed position and will be
forced against the stops on the door frame so
as to secure a tight joint.
It is the object of this invention to produce
IO' a door latch or look that shall be especially well
adapted for use on heavy heat insulated doors
such asare used in large capacity incubators and
large refrigerators, but which can also be applied .
to any other door where a secure latching device
15- is desired.
Another object of the invention is to produce
a latching device that is especially Well adapted
for, use with double doors.
'
A further object is to produce a latch of simple
20 and economical constructionbut of great strength
that shall be positive in its action and which will
not work loose.
,
A further object is to produce a latch that em
ploys rotatable latching devices that cooperate
25 with stationary wedges on the door frame in such
a manner that a large multiplication of the force
can be obtained.
The above and other objects that may become
apparent as the description proceeds are at
30._tained by means of a construction and a combi
nation of parts .that will now be described, ref
erencefor this purpose being had. to the accom
panying drawing in which the invention has been
illustrated in its present preferred embodiment
35,, and in which:
‘
Figure 1 is an elevation showing the inside of
a door equipped with the present invention;
Figure 2 is an end elevation looking towards
the left in Fig. 1;
40
1
Figure 3 is a section taken on line 3-3, Fig. 2,
and shows the latch in operative position;
Figure 4 is a section taken on line 4—4 Fig. 3,
and shows the wedge with which the latching
member cooperates;
45
Figure 5 is a section taken on line 5-5 Fig. 1,
with the door in closed position and shows the‘
manner in which the upper latch member engages
the wedge at the top of the door frame;
Figure 6 is a view taken on line 6—8 Fig. 5; and
50
Figure '7 is a view taken on line ‘l—'l Fig. 2.
It will be seen that each door is provided with
three latches, one at the top, one at the bottom
and one in the middle; these have beendesig
nated respectively as A, C and B so as to facili
56 tate the description.
Latches A and C are identical in construction
and have been shown in section in Fig. 5, which
serves to illustrate both of them. From the draw
ing, it will be seen that a round plate 8 is em
bedded in the inner surface of the door and held
in place by screws 9. Plate 8 has a hub ID that
extends into the door and which has a threaded
opening for the reception of the bolt II. The
latch member I2 is preferably circular and of the
same diameter as the plate 8. The latch mem
ber l2 has a central hub l3 and two smaller hubs
or bosses l4 that are positioned on diametrically
to
opposed points. Each latch member is provided
with a lug I5 that is offset from its outer sur
face in the manner clearly shown in Fig. 5. Se
cured to the top of the door frame, or opening,
is a wedge [6 like that shown in Fig. 6, and a simi
lar wedge is secured to the bottom of the door
frame. The two wedges are identical except that
one is a rightrand the other a left. Each wedge 20
has a part I‘! that is thinner than the remainder
and is provided with openings for securing screws
l8, the thicker portion may also have openings
for securing screws.
In Fig. 3 the operating means has been shown, 25
and this will now be described. A handle I9
has a cylindrical bolt 20 integrally attached to it
and this extends at right angles and passes
through’ an opening in the door, as clearly shown.
A circular ?ange 2i surrounds the bolt and en
gages the outside of the door. Embedded in the
inner surface of the door is a round plate 8A that
is identical with the corresponding plateshown in
Fig. 5, except for this that the. central opening is
not threaded. The inner end of the bolt 20 is
non-circular in cross section and secured to this
portion is'a latch member IZA that is similar to
the corresponding member shown in Fig. 5, ex
cept for this that it is provided with a lug 22 that
engages the stop 23 when the parts have been 40
moved to door latching position. The side of the
door frame has a wedge 24 securedto it, as shown
in Fig. 4 for engagement by the latch lug I5A. A
nut 25 is secured to the threaded end of bolt 20
and holds the operating means in assembled posi
tion. A deformed spring washer 26 is positioned
between the plate 8A and the latch member IZA,
as shown in Fig. 3 and serves to provide friction
suf?cient to hold the parts in adjusted position.
Connecting rods join the two bosses on latch 50
member I2A, each with a boss I4 on a latch mem
ber l2.
The connecting rods each comprise a tubular
section 2'! having a portion at each end inte
riorly threaded. A bronze extension member 28 55
2
2,128,439
is threaded in each end and held in adjusted posi
crank pin for engagement with one end of a con
tion by a nut 29. The parts are so adjusted that
when the handle I9 is vertical, as in Fig. 2, the
lugs l5 on latch members I2 are practically ver
tical and each engages the inclined surface of a
necting rod.
wedge It, in the manner shown in Figs. 6 and '7.
When handle i9 is in vertical position, the lug 22
engages the stop 23 and limits the rotation of the
latch member 8A.
The lug l5A on member !2A,
10 latch B, cooperates with a wedge 24 that is at
tached to the side of the door frame, where one
door is used, or to the edge of the second door,
where two doors are employed. Where two doors
are employed, both are held close by thelatches
15 on the one door.
Attention is called to the factthat the latch
members l2, 42A rotate instead of move longi
tudinally and the lugs I5, I5A therefore have a
long relative movement along the wedge surface
20 with which it cooperates.
The inclination of
the wedges may therefore be smaller than if the
movement were short and a greater pressure can
therefore be obtained from the same amount of
effort.
In the arrangement illustrated, the closing or
25
latching is e?ected by compression of tubes. 2'!
and consequently the opening is effected by ten
sion in the connecting rods for the reason that it
requires a greater force to release the latches
30 from a stationary position than to close them.
Referring now more particularly to Fig. 1 it
will be noted that the bronze extension members
28, that are connected with latches A and C, are
provided with projections, not numbered, that
35 engage with the hubs l3 of the latch members
l2, and limit the opening movement of the latch.
The latch operating mechanism B with its de
formed friction washer 26 and the stops 22 and
23 are also considered to be importantin this
combination and novel.
Having described the invention what is claimed
as new is:
1. A device for operating a latch positioned on
the inside of a door by means accessible from the
45 outside, comprising a bolt extending through an
opening in the door, the bolt having a handle
secured to the outer end thereof, a circular ?ange
integral with the bolt for engagement with the
outside of the door, a bearing disk secured to the
50 inside of the door, said disk having on one side a
positioning hub that extends into the door, the
hub having an opening forming a bearing for the
bolt, a crank disk non-rotatably secured to the
inner end of the bolt and a deformed spring
65 washer between the two disks to produce friction
tending to keep the bolt and crank disk from
accidental rotation, the crank disk having a
2. A device for operating a latch positioned on
the inside of a door by means accessible from the
outside, comprising a bolt extending through an
opening in the door, the bolt having a handle
secured to the outer end thereof, a circular ?ange
integral with the bolt for engagement with the
outside of the door, a bearing disk secured to the
inside of the door, said disk having on one side a 10
positioning hub that extends into the door, the
hub having an opening forming a bearing for
the bolt, a crank disk non-rotatably secured to
the inner end of the bolt, a deformed spring
washer between the two disks to produce friction 15
tending to keep the bolt and crank disk from ac
cidental rotation, the crank disk having a crank
pin for engagement with one end of a connect
ing rod, and a lug projecting therefrom for en
gaging a stop carried by the door to limit rotary 20
movement in one direction.
3. A device for operating a latch positioned on
the inside of a door by means accessible from the
outside, comprising a bolt extending through an
opening in the door, the bolt having a handle 25
secured to the outer end thereof, a circular ?ange
integral with the bolt for engagement with the
outside of the door, a bearing disk secured to the
inside of the door, said disk having on one side
a positioning hub that extends into the door, the 30
hub having an opening forming a bearing for the
bolt, a crank disk non-rotatably secured to the
inner end of the bolt, .a deformed spring washer
between the two disks to produce friction tend
ing to keep the bolt and crank disk for acci 35
dental rotation, the crank disk having a crank
pin for engagement with one end of a connect
ing rod, and a lug projecting therefrom to engage
a stop carried by the door, to limit rotation of the
crank disk in- one direction, and a second lug off
set from the plane thereof and extending radi
ally therefrom for engaging with a stationary
wedge.
4. A latch comprising in combination, a ro
tatable latch member having a hub concentric
with its axis of pivotation, a connecting rod hav 45
ing one end pivotally attached to the latch mem
ber at a point radially removed from the hub,
and means for reciprocating the connecting rod
whereby the latch member will be oscillated about
its, pivot, the end of the connecting rod pro 50
jecting beyond its pivot point a distance greater
than the radial distance from the pivot to the
hub whereby it will engage the latter and act as
a stop when the connecting rod moves in one
direction.
OLIVER STINSON.
55
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