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Патент USA US2404644

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July 23, 1946.
2,404,644
B. LOEWE
NOW BY JUDICIAL CHANGE OF NAME
'
v
B. LOWE
CONTROL OF ELECTRIC DEVICES
Filed Aug. 28,’ 1945
I
INVENTOR.
?mmzzn 50m?
BY
'
2,404,644
Patented July 23, 1946
UNITED STATES PATENT OFFICE
2,404,644
CONTROL OF ELECTRIC DEVICES
Bernhard Loewe, Yonkers, N. Y., now by judicial
change of name Bernard Lowe
Application August 28, 1943, Serial No. 500,357
2 Claims. (01. 200—86)
1
2
In the positions of the parts as shown the cir
The object of the invention is an improvement
cuit is supposed to be open.
in the control of electric devices.
Upon depressing the treadle 38 the projection
It is a purpose of the invention to provide for
v44 engages the incline 55 of the cam part 5| and
such devices a novel type of foot switch control
is thereby de?ected to the left, tensioning the
using for the switch proper an ordinary standard
spring 43 and reducing somewhat the tension of
type encased hand operable switch, e. g. a switch
the spring 42. When the projection 44 reaches
of the kind on sale in all department and hard
the left end 56 of the slot 54 the cam and the
ware stores, and using for the foot operation of
tumbler rigidly connected therewith is swung
said hand switch ‘an actuator device adapted to
be combined with said hand switch.
10 anticlockwise whereby the circuit is closed.
As soon as the treadle 38 is released it rises
Other purposes and advantages of the inven
whereby the projection 44 is raised in the slot
tion will become apparent from the following de
54. As soon as the projection 44 reaches the
scription in connection with the accompanying
upper part of the cam and slot the spring 43
drawing showing some embodiments of the in
vention by way of example.
15 draws the bar 4|] to the right side of the apex 53.
In said drawings
The circuit thus remains closed.
When the treadle 38 is depressed again the pro
Figure 1 is a vertical longitudinal section
jection 44 now rides down the right side 51 of the
through one form of the new actuator;
cam part 5| until it reaches the right end 58 of
Figure 2 is an elevation of the tumbler cam
of the actuator shown in Figure 1.
20 the slot 54 whereupon it rocks clockwise the cam
and tumbler around the axle 50 back to the
The device shown in Figure 1 works according
position shown in Fig. 1 thereby opening the
to the known principle that the switch is closed
by one depression of the actuator and remains
circuit.
By the just described movement the spring 42
closed until it is opened by a subsequent or sec
has been tensioned and the spring 43 has been
ond depression of the actuator.
slackened.
The device uses as the switch unit proper the
When the treadle 38 is released again it rises,
commercial standard type encased tumbler hand
the projection 44 rises in the slot 54, and the bar
switch 25 to be connected with the actuator trans
4|! is pulled back by the spring 42 to the left
mission by mere overlapping i. e. without requir
ing any alteration of the tumbler 26, holes, 30 side position shown in Figure 4.
It is to be noted that the pivot 4| connecting
notches, etc., in the latter.
,
the push bar 40 with the treadle 38 does not move
The hand type switch 25 is attached, preferably
down and up in a straight vertical line, but moves
in an easily detachable manner, to a base plate
36 to which is secured at 3‘!v a treadle 38 held
in an arc of a circle as indicated by the arrow
in elevated position by a U-shaped leaf spring 39.
For transmitting the movement of the treadle
38 to the tumbler 26a pusher or bar 40 is pivoted
at 4| to the treadle and is normally held centered
in the position shown by the springs 42 and 43.
59. This curved movement would cause trouble if
the cam 46 would be symmetric like similar cams
used in push button switches, i. e. if the cam parts
55 and 51 were absolutely equal.
To avoid such trouble said cam 46 is slightly
A projection 44 of this bar engages into a slot
54 of a tumbler cam designated generally by the
number 46 and shown separately in elevation in
Figure 2.
asymmetric, just enough to compensate for the
curvature of the arrow 59.
Of course, in all modi?cations of the object of
the invention any suitable or well known means,
26 by overlapping being clamped onto said tum
if deemed desirable, may be used for relieving the
tumbler shaft from part of the actuating pres
bler by means of one or more side bars 41 and
sure.
clamping screws 48 engaging in threaded holes
Instead of the simple two-pole tumbler switch
shown any other standard type hand switch with
This cam is rigidly attached to the tumbler
49 of the cam. Thus for all purposes the cam 46
may be considered as a tumbler directly secured
immovably to the tumbler shaft 50.
The cam 46 has a central part 5| provided with
a notch 52 adapted to ?t over the tumbler 26.
The part 5| having the form of an inverted V
with a rounded apex 53 is surrounded by the slot
54 of similar shape.
two or more poles may be used, of course with
corresponding self-evident alterations of the ac
tuating mechanism.
What I claim is:
1. As an article of manufacture an actuator for
closing and opening by successive strokes of down
55 wardly directed foot pressure a standard type
2,404,644
3
encased hand operable switch, said actuator com
prising, in combination, two main parts, one of
which is a base, and the other of which is a
treadle attached to said base, said treadle adapt
ed to be swung downward by foot pressure and
upward by elastic force, and transmission means
connected with at least one of said main parts,
said transmission means comprising a bar pivoted
4
directions by two consecutive depressions of said
bar and to be coupled with said handle by mere
overlapping.
2. As an article of manufacture an actuator as
claimed in claim 1, comprising pull spring means
adapted to return said bar to a central neutral
position after each depression and to keep said
b'ar reliably in said central neutral position dur
lng periods of rest.
to said treadle and an asymmetric cam, in the
form of a V, adapted to be swung in two different 10
BERNHARD LOEWE.
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