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Патент USA US2121530

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June 21, 1938.
H, J, MURPHY
2,121,530
DOOR LATCH STRUCTURE
Filed April 16, 1936
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2,121,530
Patented June 21, 1938
UNITED STATES
_
PATENT OFFICE ,
2,121,530
DOOR, LATCH STRUCTURE
Howard J. Murphy, Greenwood, Mass., assignor
to United-Carr Fastener Corporation, Cam
bridge, Mass., a corporation of Massachusetts
Application April 16, 1936, Serial No. 74,657
(Cl. 'l0-146)
l 6 Claims.
My invention relates to a latching device of
simple and inexpensive construction for use with
a door or similar part of a suitable structure.
An object of my invention is to provide a
5 simple, easily manufactured device having a
latch means adapted to snap under the action of
a spring into a recess or aperture formed in an
abutment, the arrangement being such that in
order to release the latch for opening the door
10 or the like part, it is only necessary to exert lon
gitudinal pressure on a handle >means provided
on opposite faces of the .part with which the
latching device is assembled. Other objects will
appear from the following description.
15
Referring to the drawing, which illustrates a
preferred embodiment of my invention:
Figure 1 is an end elevation' »of my improved
latching device;
Fig. 2 is a plan view of the device shown in
20 Figure 1;
~
Fig. 3 is a fragmentary side elevation of the
device shown in Fig. 2; '
Fig. 4 is a side elevation of the device shown
in Figs. 1 and 2 with the handle knobs removed;
25
Fig. 5 is an enlarged section taken on the
line 5_5 of Fig. 4;
Fig. 6 is a view similar to that of Fig. 4 but
with a side of the outer casing removed show
ing the parts of my device in latching position;
30
Fig. ’1 is a View similar to that of Fig. 6 but
showing the parts in unlatched position;
Fig. 8 is a section taken on the line 8_8 of
Fig. 4 with the parts of my device in latching
position;
35
Fig. 9 is a section similar to that of Fig. 8
with the parts in unlatched position;
Fig. 10 is a part sectional view of a latch actu
ating member used in a preferred form of my
40
device;
Fig. 11 is an enlarged section taken on the
line II_II of Fig. 10;
Fig. 12 is a section taken on the line I2_I2
of Fig. 8 with my actuating member in unlocked
position; `
45
Fig. 13 is a section similar to that of Fig. 12
with the actuating member in locked position;
Fig; 14 is a plan view of the slidable latch
means used in a preferred form of my device;
and
50
Fig. 15 is a plan view of a spring supporting
member used in a preferred form of'my device.
Referring in detail to the illustrations, I have
shown, in Fig. 2, a casing I, within which the
parts of my latching device are contained, an
55 apertured plate 2 for securing my device to the
proper portion of a door or other part (not
shown) with which it is to be assembled, an
actuating member 3 extending axially through
the casing I for moving the latch means of my
device, and a knob-like handle 4 secured to each 5
end of the bar 3.
The outer casing I may be made of one piece
of sheet metal, but, in my preferred form, I
have chosen to form it of two pieces, as most
clearly shown in Fig. 5. One of the pieces is 10
inthe form of a three-sided box-like part 5 hav
ing an intermediate wall 6 and spaced side walls
1 upstanding therefrom. The intermediate wall
6 has a screw-'receiving aperture 8 and another
g
aperture having a central portion 9, elongations 15
I0 on opposite sides of the central portion, and
a slot II extending into the material at one side
of the central opening 9 between the elongations
I|l_|0 (Fig. 4). The material of- the side walls
1_1, adjacent to the outer ends of the elongations IIJ, is pressed out to form the grooves II)EL
extending partially across the width of the walls
1_1, as most clearly shown in Figs. 2, 6 and '1.
An end I2 of the casing part 5 is opened to
permit passage of the latch means therethrough,
as most clearly shown in Figs. 8 and 9. The op
posed side walls 1 of the casing part 5 are pro
vided with a flange I3 at one end (Figs. 4 and 6)
for securing the casing to the plate 2. The
other piece of the casing I is in the form of a
plate I4 enclosing the open sideof the part 5
and having iianges I5 (Figs. 2 and 5) over
lying portions of the side walls 1. The plate I4
has a screw-receiving aperture I6 disposed sub
stantially midway of its length (Figs. 8 and 9)
and another aperture comprising a central
opening I1 and a slot I8 adjacent to the open
ing I1 (Figs. 6, '7, 12 and 13). The apertures
I6, I1 and I8 are disposed in respective oppo
site relation to the similarly shaped apertures
8, 9 and II Vof the casing part 5. The plate I4
2o
25
30
35
40
is secured to the part 5 by a means, such as a
machine screw I9, extending through the aper
ture I6 of the plate I4 and the aperture 8 of the
intermediate wall 6.
45
A slidable member 20 is assembled within the
casing I and adapted to slide longitudinally rela.
tive thereto. The member 20 is provided with a.
latch means comprising a beveled nose 2I adapt
ed to snap under the action of a coil spring 22 50
into a recess or aperture formed in an abutment
(not shown). The spring 22 is assembled within
the casing I and, in my preferred form, has one
end bent in the form of a loop 23 which is
hooked around the screw I9, as shown in Figs. 55
2
2,121,530
6-9. The other end of the spring >22 is slipped
over a shank 24 formed as an integral part of a f
_supporting member 25 (Fig. 15) which is shaped
to fit within the nose end of the slidable mem
ber 20, as most clearly shown in Figs. 6-9. I do
not Wish to be limited, however, by the particu
lar spring assembly illustrated and described
because the form and position of the spring 22
could be changed or alterations made in the par
10 ticular construction of the spring supporting
site ends of the tube 32 and formed in a way
to provide a flat continuous ring 38 (Figs. 10
and 11) with the material of the outside edgesA
of the portions 36 turned inwardly so as to pro
vide a portion 39 enclosing the outer end of the
ring. A key-receiving slot 40 is cut in the por
tion 39 as shown in Fig. 11. >A bushing part Y
4I is located at each of the opposite ends of the
tube 32 having one end in substantially adja
cent relation to the inturned portion 39 of the 10
member 25 without-departing from the apparent
ring 38 (Fig. 10). The material 42 adjacent to
scopeof my invention.
Referring in more detail to the slidable mem
ber 20, as illustrated in Fig. 14, I have shown a.
15 one-piece sheet metal part comprising a base
the free ends of the tube 32 is turned inwardly
20
25
30
`
35
40
to hold the bushing 4I in secured position. A '
key-receiving slot 43 extends through the ma
terial of each of the _bushings 4I (Figs. 3 and 4). 1.5
plate portion 26 and upstanding spaced side walls '
In operating the locking means of my device,
21. Each of the free edges of the side walls a key (not shown) is inserted into the slot 43
21 at one end extend in angular relation to the provided in the bushing located at either end of
plane of the plate 26, and the material adjacent the tube 32, and the bushing is turned until the
to an end of the plate 26 has been bent back in slot 4_3 aligns with the slot 40 at the end of 20
adjacent relationship to the slanting edges of the sleeve 36. At this point, a particularly
the side walls in a way to form the'beveled nose shaped key is easily inserted into the slot 40 of
portion 2I (Figs. 8, 9 and 14). An aperture 28 the sleeve so that the sleeve may be turned so
is formed in the plate portion 26 of substantially as to move the rectangular projection.'31 from a
the shape shown in Figs. 6 and 'I with a portion position adjacent the material of the tube 32 25
of the material of the plate 26 extending into bordering one longitudinal side of the aperture
the aperture 28 for a predetermined distance to 34 to a position adjacent the material border
form a projection 29 (Figs. 6 and '7) for a pur
ing the other longitudinal side, as most clearly
pose which will be hereinafter more fully de
shown in Figs. 12 and 13.
scribed. A slot 30 is formed in each of the side
vIn assembling the parts of my device, the 30
Walls 21 and positioned in opposed relation one
spring 22 and the supporting member 25 are as
to another.. as most clearly shown in Fig. 14. sembled in proper position with the slidable
Each of the slots 30 extends from. the longitudi
member 20 and the assembled parts are posi
nal free edge o'f one of the side walls 21 to a tioned within the casing part 6 so that the latch
point adjacent the plate 26. It will be noticed means 2| faces the opening I2 and the longitudi 35
that a free edge of each of the plates 21 adja
nal free edges of the side walls 1 of the slidable
cent to one side of the respective slot is disposed member face the intermediate wall 6 of the part
in an angular relation to the plane of the plate 5. The plate I4 is now moved into position on
26 thereby providing the cammed surface 3I.
the open side of the casing part 5 with the
In my preferred form, the actuating member ñanges I5 overlapping portions of the side walls 40
3, as most clearly shown in Figs. 10 and 11, com
1. The screw means I9 is inserted through the
prises a tube-like outer casing 32 having ex
plate I4, the wall 6, and the intermediate spring
ternal threads 33 at opposite ends for cooperat
ing with internally-threaded neck portions of the
loop 23 so that the casing pieces and the parts
contained within the casing are in secure ñnal
4.5 knobs 4 to secure them to the member after the
assembly. When the parts have been assembled
latching device >has .been assembled with the
part by which it is supported. The outer tube
32 is provided with a rectangular-shaped aper
ture 34 of predetermined size (Figs. 8, 9, 12 and
50 13) located in stated position on its length. A
in
pin 35 is driven through the itube 32 and is
finally disposed at a predetermined position rela
tive to one end of the aperture 34 in such a way
that the free ends project beyond opposite sides
55 of the casing.
The free ends of the pin 35 are
adapted to engage the cammed surfaces 3| for
moving the slidable latch member 20 against the
action of the spring 22 in a manner which will
be hereinafter more fully described.
In order that unlatching of my device may
intentionally be prevented, I have provided a
locking `means as a part of the actuating mem
ber 3 which is adapted to cooperate with a part
of the casing in such a way that the slidable
65 member -20 cannot be moved when particular
parts of my device are in certain respective posi
tions. The parts of my locking means preferably
60
include a rotatable bow-shaped sleeve member
36 positioned within the tube 32 having a rec
70 tangular-shaped projection 31 integral with the
material of the sleeve at substantially the center
thereof and projecting through the aperture 34
of the tube 32, as most clearly shown in Figs.
6-9, 12 and 13. The material at opposite ends
of the sleeve 36 is spaced from respective oppo
.the manner hereinabove described, the
cammed surfaces 3l will intersect the elongations
I0 of the aperture of the intermediate wall 6.
The casing I is readily assembled with a door
or the like part by forming a hole extending 50
from the surface of that side of the door facing
the abutment, when the door is in closed posi
tion, into the body portion of the door for a dis
tance equal substantially to the length of the
casing. After this has been carried out, a small 55
er hole is bored through the door in right-angu
lar relation to the first hole and intersecting the
first hole at a predetermined point. The smaller
hole is adapted to receive the .actuating member
3. As„the cross-sectional area oi' the casing I 60
is relatively small, the first hole needs to have
a diameter which is only slightly larger than
the diameter of the casing so that after the
casing has been passed longitudinally into the
aperture, it will be snugly held in position by 65
the walls surrounding the aperture. It has been
found that a round hole provides a suitable set
ting for securing the casing within the body of
the door even though the casing is preferably of
a box-like shape. My relatively simple means 70
of assemblingthe casing part of my device with
in the door is a great improvement over ordinary
methods which required a relatively great
amount of time-taking cutting in the door in
order to prepare it for receiving a latch device 76
`
3
2,121,530
of the type which is now in common use as
against my simple device which can be inserted
ing a minimum. number of parts and capable of
easy, yet satisfactory, operation.
Obviously, the vmechanical» 4structure of my
After the casing I has been finally fixed in, latch device might be widely varied without de
proper position within the body portion of the parting from the principles exemplified by this
door- or part with which it is to be assembled, disclosure and for that reason I do not wish
~ in quickly bored holes.
the actuating member 3 lis passed through the
to be limited by the preferred form of my in
door and the casing from a point outside one
face of the door so that when finally positioned
vention as illustrated and describedbecause the
scope of my invention is best defined in the fol
10 the ends of the member project beyond the
lowing claims.
4front and back of the door in a well known , f
manner. In order to pass the actuating member
3 through the casing, that end of the member
on the same side of the pin 35 as the projection
15 31 is inserted into the central opening 9 of the
intermediate wall 6 and as the member is pushed-
through the casing I, the projection 31 passes
through the slot II and the free ends of the pin
35 align with the elongations I0. After the pro
20 Jection 31 is located within the casing I, a split
ring 44 is slipped over the tube 32 and snapped
into the peripheral groove 45 cut in the tube 32
.on the opposite side of the aperture 34 from the
pin 35 so as to engage the outside surface of the
25
plate I4 (Figs. 5 and 8) for preventing complete
'axial withdrawal of the tube relative to the cas
ing in the direction opposite to that in which it
was inserted.
v
The pin member 35 is now located in a posi
30 tion substantially as shown in Figs. 5 and 8 and
when longitudinal pressure is exerted upon the
tube 32, so as to move the pin 35 toward the
base portion 26 of the slidable member, the op
posite ends of the pin 35 engage thecammed
surfaces 3l of the slidable member side walls 21
with the result that when the pin has reached
the end of the slot 3IJ,.as shown in Fig. 9, the
nose 2| of the slidable member will have been
Withdrawn into the casing against the action of
40 the spring 22. When the longitudinal pressure
is released, the4 natural action of the spring 22
I claim:
.
1. A door latching device comprising, in com
bination, an outer casing having opposed aper
tured sides, a spring-actuated member slidably
disposed within said casing, said member having
a base plate facing one of said sides and up
standing spaced side walls integral with said
`base plate, said plate having an aperture in
alignmentwith the apertures of said sides, said
member having a latch means at one end there 20
of and a cam surface formed in one 0f said
side walls, and a member extending axially
through the apertures of said casing and said
base plate, said last-mentioned member having
means engaging the cam surface of said side 25
wall when pressure is applied longitudinally of
said axially-extending member thereby moving
said slidable member for disengaging said latch
means from a cooperating recess of another part,
and a stop means formed in said plate portion 30
cooperating with said axially-extending member
for limiting longitudinal movement of said slid
able member relative to a side of said casing.
2. A door latching device comprising, in com
bination, an outer casing having a pair of op
posed apertured sides, a spring-actuated mem
ber slidably disposed within said casing and hav
ing a latch means at one end thereof, said mem
ber having a base plate facing one of said sides
and upstanding spaced side walls integral with 40
said-base plate, said plate having an aperture in
forces the latch means 2| into normal engaging ' alignment with the apertures of said sides, said
position. as shown in Fig. 8, and at the same time side walls having oppositely disposed slotsex
the pin 35 returns to the normal position shown
It will be noticed that when the slid
able member is in the position shown in Fig. 9,
a portion of the projection 31 extends through
the slot I8 of the plate I4 beyond the outside
surface of the plate I4. When the latch means
50 2| is in normal position the projection 31 is dis
posed entirely within the casing, as shown in
Fig.- 8. -The projection 29 preferably aids in
limiting movement of the slidablev member by
45 in Fig. 8.
engaging a side of the tube 32, as shown in Fig.
'7,-> after the camming action has been com
pleted.
My latching device may be easily locked so as
to prevent movement of the slidable member out
of latching position by turning the sleeve 36,
60 as illustrated in Figs. 12 and 13, so that the pro
jection 31 is moved out of alignment with the
slot I 8. After the projection has been move'd
out of alignment it will take a position opposite
the material of the plate I4 substantially as
shown in Fig. 13. As a result of this locking ac
tion, it is impossible for the pin member to be
moved into engagement with the cammed sur
faces 3I for the purpose of changing the posi
tion of the slidable member 20. When unlatch
ing is desired, the projection 31 is realigned with
the slot I8 thereby allowing the projection to
pass part way through the plate I4 when the
pin 35 engages the cammed surfaces 3i.
As a result of my invention, I have provided a
75 latching device of simple construction compris
tending from the longitudinal free edge of each
of said side `walls to a point adjacent said base 45
plate, the free edge of the material adjacent to
one side of each of said slots disposed in angular
relation to said base plate for providing camming
surfaces, and a member extending axially
through the apertures of said casing and said 50
base plate, said last-mentioned member having
means engaging the cammed surfaces of said side
walls when pressure is applied longitudinally of
said axially-extending member thereby moving
said slidable member for disengaging said latch 55
means from a cooperating recess of another part.
3. A door latching device comprising, in com
bination, an outer casing having a pair of op
posed sides, each of said sides having an oppo
sitely disposed central opening with a slot on 60
one side thereof, a spring-actuated member slid
ably disposed within said casing, said member
having a latch means at one end thereof nor
mally disposed in relative latching position, said
member having a base plate facing one of said 65
sides and upstanding spaced side walls`integral
with said base plate, said plate having an aper
yture in alignment with the opening and slot of
each of the sides of said casing, at least one of
said side walls having a cam surface, and a tube 70
like member extending axially through the cen
tral openings of said sides'and the aperture of
said base plate, said last-mentioned member hav
ing a projecting means engaging said cam sur
face when pressure is applied longitudinally of
4
2,121,530
said tube-like member thereby moving said slid
said slidable member for disengaging said latch
able member for disengaging said latch-'means
from a cooperating recess of another part, and
said tube-like member having a movable locking
means adapted to project through the slot adja
cent to the opening of one of said casing sides
when said projecting means is in engagement
with said cam surface and means for turning
the locking means out of alignment with said
slot when said means is out of engagement
with said cam surface thereby to lock said slid
means from a cooperating recess of another
able member in latching position.
_
'
4. A door latching device comprising an aper
tured outer casing, a spring-actuated slidable
member disposed within said casing having a
latch means at one end thereof, said slidable
member having at least one cam surface, and a
member extending axially through said casing
for moving said slidable member for disengaging
said latch means from a cooperating recess of
another part, said last-mentioned member hav
ing a means projecting from at least one side
thereof for engaging said cam surface when
pressure is applied longitudinally of said mem
ber, and said last mentioned memberhaving an
aperture and a movable locking means extend
part, said last-mentioned member having an
apertured tubular part, a means extending from
said part for engaging said~cam surface when
pressure is applied longitudinally of said part,
and a rotatable sleeve disposed within said part
having a. projecting means extending through
said aperture, said sleeve adapted to be turned for
moving said projecting means out of alignment
with a cooperating aperture of said casing there
by locking said device for preventing disengage
ment of said latch means, and means assembled
with said tubular part preventing unintentional
15
complete removal thereof from said casing.
6. A door latching device comprising an aper
tured outer casing, a spring-actuated slidable
member disposed within said casing having a
latch means at one end thereof, said slidable
member having at least one cam> surface, and a 20
tubular member extending axially through said
casing for moving said slidable member for dis
engaging said latch means from a cooperating re
cess of another part, said tubular member hav
ing a pin projecting from opposite sides thereof
for engaging said cam surface when pressure is
ment with an aperture of said casing and in an
applied longitudinally of said member, an aper
ture located between said pin and one of the ends
of said tubular> member and in stated position
other position ~out of alignment with said
»relative to the free ends of said pin, and a mov
ing through' said aperture, said locking means
adapted to be disposed in one position for align
aperture.
.
5. A door latching device comprising an aper
tured outer casing, a spring-actuated slidable
member disposed within said casing having a
' latch means at one end thereof, said slidable
member having a- cam surface, and a member
extending axially through said casing for moving
30»
able locking means extending through said aper
ture,. said locking means adapted to be disposed
in one position for alignment with an aperture
of s'aid casing and in another position out of
alignment with said aperture.
`HOWARD J. MURPHY.
35
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