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June 20, 1950
I s. w, NoRms
MECHANICAL TIME-DELAY DEVICE
2,512,369
Filed March 2'7, 1947
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INVENTOR
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- GeoyeN/Vorna
BY ‘-—.
62015.
ATTORNEY
Patented June 2Q, 1950
2,512,369
UNITED STATES PATENT OFFICE
2,512,369
MECHANICAL TIME -DELAY DEVICE
'7 George W. Norris, Wilkinsburg, Pa., assignor to
Westinghouse Electric Corporation, East Pitts
burgh, Pa., a corporation of Pennsylvania
" Application. March 27, 1947, Serial No. 737,690
>
6 Claims.
1,
(01. 161-—1)
,
My device is not limited to the provision of
a time delay for a switch, but is herein merely
shown in combination with a switch to illustrate
its practical utility and to facilitate the disclosure.
In the Figs-1 and 2, the control panel I is shown
Many electric switches have tripping mech
anisms, which may be actuated manually‘or by
electromagnetic means, that elfect the application
as a mounting base for an electric switch and
for the timing mechanism T, which I dispose
in operative relation to the switch. The switch
of a force to the elements forv operating the mov
able elements of the switch contacts. Often it
is essential that the operation of the movable
elements of the switch contacts be delayedgafter
the tripping mechanism has been operated, by a
'
"
'
2
My invention relates to time delay devices, and,
more particularly to devices for delaying the com
pletion of the operation of a mechanical“ element
to which an actuating force‘ has beenv applied.
selected interval of time;
‘
proper is shown as a contact-bar 2 resiliently
mounted on the switch arm 3 pivoted at 4 to the
member 5 which is, in turn, pivoted at 1. The
contact bar 2 bridges a pair of contacts 6, only
>
one of which can be seen from the side, to es
The time delay devices heretofore in use with
electric switches include complicatedescapement 16 tablish some useful electric circuit.
The member 5 may be L-shaped as shown in
mechanisms, dashpots, vanes, etc.‘ These devices
Fig. 1, when the switch is of the manually actu
have been found to require frequent attention and
ated type, or comprise a U-shaped armature as
are as a rule rather complicated and expen
shown in Fig. 3, when the switch is of the elec
sive. Often certain elements require close toler
ances in
the manufacture.
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1
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One speci?c object of my invention is the pro
vision of a time delay between the tripping op
eration of a switch and the'completion of the
operation of the movable‘switch contacts that
either close or interrupt a circuit.-
-
'
'
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' ,
A somewhat more speci?c object‘ of my inven
tion is the provision vof an inertia responsive‘ time
delay device for delaying the longitudinal move
ment of a rod, bar, or similar machine element.
Other objects and advantages will become more
readily apparent from a 'studygof the following
speci?cation and the accompanyingv drawing, ‘in
which:
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,
oted at l on the bracket 8 secured to the base I.
A switch actuating arm, or lever, 9 is also piv
oted on the bracket 8 at point 1. An overcenter
spring [0 is secured, under tension, to the pins
25
A broad object of my invention is the provi
sion of simple, inexpensive and reliable mechani
cal time delay means 'for‘electric'switches.
A still broader object‘ of my- invention is the
provision of mechanical time delay means for a
movable mechanical ‘element to‘ which an actuat 30
ing force has been applied.
tromagnetically actuated type. Member 5 is piv
H and I2.
A spring [3, under a selected compression be
tween the head M of bolt !5 and the arm 3, ?rmly
holds arm 3 against the upwardly directed leg
of member 5.
When the lever 9 is moved counterclockwise
about the pivot 1, the line joining the center of
the pins II and I2 falls above the pivot ‘l with
the result that member 5 moves clockwise with a
snap action. The contact bar 2, however, does
not immediately bridge the contacts 6 since my
timing mechanism T prevents such operation.
The lower end of the switch arm 3 has an ele
ment I6 bent rearwardly at right angles to the
lower end ll. The element 15 is provided with
a bifurcated, or slotted, end to receive the stem
Figure 1 shows a side view'of my/invention as 40 I 8 between the fork ends. The head is on stem.
applied to an electric switch, with the parts shown
in the position they will occupy before the switch
I8 prevents the element Hi from moving upwardly
and in consequence the arm 3 moves counter
clockwise with the reference to the member 5 to
vthus compress the spring !3, as shown in Fig. 2.
Since the spring I3 urges the'arm in the clock
in Fig. l, but with the parts shown in the position
wise direction, an upward pull is produced on the
they will occupy after the switch actuating ele
stem l8.
ments have been actuated, but before the timing
The stem I8 is guided for rectilinear motion in
cycle has been completed;
Fig. 3 shows electromagnetic switch actuating 50 the bearings 20 and 2| disposed in the supporting
bracket22. At the lower end of the bracket I
means for the type of switch shown in Figs. 1
mount an eyelet 23 having the stem 24 mounted
for vertical adjustment in the slot 25. The stem
Fig. 4 is ‘a View showing certain essential ele
24 is threaded to receive the nuts .27 for locking
ments of my invention to larger scales; andv "
the eyelet into any vertical position within the
Fig. 5 shows a modi?ed joint.
'
55 range of the slot 25.
actuating elements have been operated; ‘ i
Fig. 2 is a side view of the subject matter shown
and 2;
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2,512,369
The eyelet has a hole (as the word eyelet im
plies) of a special internal peripheral side wall.
The internal side wall has the sectional appear
ance of a nut with a single thread, except that
it is not a thread but a single wedge shaped an
4
the rectilinear movement of stem [8 when a
force is applied to it. In the application shown,
the mechanism can be used with a manually op
erable switch as shown in Figs. 1 and 2 or with a
magnetically actuated switch as shown in Fig. 3.
In either case, my device provides a time delay
nulus with the internal peripheral points of the
and also positively prevents switch operation
wedge all falling in a plane normal to the plane
from shock.
of the eyelet.
While I have in e?ect shown and described
Disposed in the eyelet is the threaded stem or
but a single embodiment of my invention, I am
10
rod 28. The threads of this rod may be stand
aware that others, particularly after they have
ard or have any other known pitch. The rod has
‘had the bene?t of my disclosure, may devise
a single thread and the sectional contourshould
modi?cations of my apparatus. I, therefore, do
be such that the pointed tooth of the annulus ?ts
not wish to be'limited to the showing made but
into the thread. This is shown at 3! in; Fig. 4.
wish to be limited only by the scope of the claims
The minimum diameter of the hole in the eyelet 15
hereto appended.
is so chosen that it is equal to or preferably just
I claim‘as my invention:
a very small fraction of the dimensions greater
1. The combination of, a base, an elongated
than the mean diameter of the threads on the
member mounted for slidable longitudinal move
rod 28.
ment on the base, a threaded rod aligned with
This means that when the tooth 32, as seen 20 said member, a loose connection between one end
in Fig. 4, is at‘ the bottom of the thread at 3|,
of the rod and the adjacent end of the member,
then the apexr33_will clear the apex 34. Now,
a ring disposed about the threaded rod, said ring
as an ‘upward pull is applied to stem 18, an up
having a sectional’ shape at its inner periphery
ward pull is applied to rod 28 through the link
to ?t the threads and having an internal diam
type universal joint 38. The tooth 32 thus pro 25 eter that is equal to the diameter of the rod less
duces a counterclockwise force on the rod 28.
one threaddepth and said ring being ?xed to
The‘tooth 32, at the right in Fig. 4, thus slides to
the base so that its axis is in alignment with
the left and downwardly with reference to rod
the rod, means for applying a force, acting
28. At the same time the apex 33 of the tooth
through a given distance, to the free end of said
30
'32 at the left clears the apex 34 of the thread and
member.
the apex 33 moves into the bottom of the thread
2. The ‘combination of, a base, an eyelet ?xed
at 35. Since the rod 28 bears a true thread,
whereas the eyelet presents’ a hole with a sharp
on the base, said eyelet- ' being disposed hori
zontally and having a circular opening such that
edged internal periphery, the rod 28 does not
the opposite facing edges present V-shaped pro
oscillate back and forth in the plane of the fig 35 jections when the eyelet is taken in any vertical
ures, as- the simpli?ed explanation just given
section plane including the axis of the eyelet, a
seems to imply, but moves so that its lower end
threaded rod disposed in the eyelet, the diameter
describes a circle with reference to a plane nor
of the rod being‘so related to the diameter of
mal to the sheet bearing the drawings. The rod
the opening that the diameter of the opening is
28, while it makes its gyrations, also moves ver
equal to the diameter of the rod less a tri?e
tically and thus permits the stem l8 to move
more than the thread depth, and a weight at the
vertically.
lower end of the rod to provide a longitudinally
The length of the rod 28 may be varied, the
acting force on the rod, whereby said rod descends
magnitude of the weight 29 maybe changed, or
longitudinally at a relatively slow rate as it nu
the longitudinal adjustment of the weight 29
tates through the eyelet.
may be changed with reference to rod 28, or any
3. In apparatus for delaying the progression
combinations of these changes may be made to
alter the timing to be e?ected.
If the tolerances are made close for the eyelet
opening in relation to the threads on the stem
'28, as might be desirable for a timingmechanism
of my type from which a long useful life is ex
pected, then the use of the link 30 is necessary
to permit gyratory motion of the region 35; The
node‘ for the gyrating rod 28 will thus be sub
stantially in the horizontal plane of the eyelet.
in a generally longitudinal direction of an elon
gated member, a pendulous elongated member
a base provided with a bracket having an open
ing therein such that opposite edges of the open
ing are shaped to provide V-shaped projections
falling in the same plane with the apices of the
V’s directed toward each other, said member be
ing provided with V-shaped serrations at op
posite outer edges, the disposition of the serra
tions'being such that the peaks at one side are
in transverse alignment with the valleys at the
other side, the peaks of the projections being so
spaced that the distance between them is greater,
60
joint at region 36. The node of the gyrating
by a relatively small fraction of the height of the
rod 28 is then in region, 36. This latter con
projection, than the distance between the aligned
struction has been found to be quite satisfactory.
valleys and peaks of the serrations, and means
To provide the loose connection at region 36, stem
for applying a force longitudinally of the mem
id’ is provided with threads that ?t quite tight
ber to act through a given distance.
into the sleeve nut 30'. The upper'threads on
4. In apparatus for delaying the progression
rod 28' are made with a sloppy ?t in the sleeve
in
a generally longitudinal direction of an elon
nut 30’. The upper end of rod 28’ is provided
gated member, a pendulous elongated member a
with‘a ?at tongue 5| to ?t loosely‘into a‘rectangu
base provided with a bracket having an opening
lar transverse slot 52 in‘ the bottom of stem l8’.
therein such that opposite edges of the openings
By threading the sleeve nut 3E3’ tightly on
are shaped to provide V-shaped projections fall
stem
held in
I8’ the
to the
position
position
shown,
shown
a while
cheap rod
universal
28'
ing in the same plane, with the apices of the
V’s directed toward each other, said member
joint is provided that does not come. apart be
beingprovided with V-shaped serrations at op
cause rod 28' cannot be turned.
'
My device thus provides for "a time delay tori 75 posite outer edgesjthedisposition of the serra
'For a cheaper yet very useful construction, stem
l8 and link 30 may be a single stiii' rod, as rod
l8’ shown in Fig. 5, thus providing but a single
5
2,512,369
tions being such that the peaks at one side are
in transverse alignment with the valleys at the
other side, the peaks of the projections being so
spaced that the distance between them is greater,
by a relatively small fraction of the height of the
projection, than the distance between the aligned
valleys and peaks of the serrations, means for
adjusting the moment of inertia of the member
about the opening in the bracket, and means for
applying a force longitudinally of the member
to act through a given distance.
for slidable longitudinal movement in the bear
ing means, a link, a universal joint, said universal
joint connecting one end of the link to one end
of the member, a second universal joint, a rod
having a weight at, or near, one end, means for
adjusting the position of the weight longitudi
nally of the rod, said second universal joint con
necting the other end of the link to the other
end of the rod, said rod having threads near
said other end, a ring, ?xed to the base, en
circling the rod at the threads, said ring being
5. In a time limit device, in combination, a
shaped at its inner periphery to ?t into the
base, bearing means on the base, an elongated
threads and having a diameter at its inner pe
member in the nature of a rod, or bar, mounted
riphery that is a tri?e greater than the diameter
for slidable longitudinal movement in the bearing 15 of
the rod less one thread depth, whereby said
means, a link, a universal joint, said universal
rod will nutate, with a node in the region of the
joint connecting one end of the link to one end of
ring, when a longitudinal pull is applied to the
the member, a second universal joint, a rod hav
other end of the member to delay the slidable
ing a weight at, or near, one end, said second
movement of the member.
universal joint connecting the other end of the 20
link to the other end of the rod, said rod having
GEORGE W. NORRIS.
threads near said other end, a ring, ?xed to the
base, encircling the rod at the threads, said ring
REFERENCES CITED
being shaped at its inner periphery to ?t into
The following references are of record in the
the threads and having a diameter at its inner
file of this ‘patent:
periphery that is a tri?e greater than the diam
eter of the rod less one thread depth, whereby
UNITED STATES PATENTS
said rod will nutate, with a node in the region
Number
Name
Date
of the ring, when a longitudinal pull is applied
739,168
Garrecht ________ __ Sept. 15, 1903
to the other end of the member to delay the E: 1,054,057
Trufant __________ __ Feb. 25, 1913
slidable movement of the member.
1,293,809
Kux ______________ __ Feb. 11, 1919
6. In a time limit device, in combination, a
‘1,896,904
Laven ____________ __ Feb. 7, 1933
base, bearing means on the base, an elongated
1,972,971
Barenyi __________ __ Sept. 11, 1984
member in the nature of a rod, or bar, mounted
2,475,730
Wandrey ________ __ July 12, 1949
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