Патент USA US2404644код для вставки
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.