US2465086A

US2465086A - Hand-operated cam switch

Info

Publication number: US2465086A
Application number: US604177A
Authority: US
Inventors: Grossen Walter
Original assignee: FR SAUTER A G FABRIKELEKTR APP
Current assignee: FR SAUTER A G FABRIKELEKTR APP; FR SAUTER AG FABRIKELEKTR APPARATE
Priority date: 1944-05-04
Filing date: 1945-07-10
Publication date: 1949-03-22
Anticipated expiration: 1966-03-22
Also published as: GB656391A; FR911971A; CH241518A

Description

March 22, 1949. w, GROSSEN 2,465,086

HAND OPERATED CAM SWITCH Filed July 10, 1945 Fig.1 I

Ill- 7 Patented Mar. 22, 1949 HAND-OPERATED CAM SWITCH Walter .Grossen, Basel, Switzerland, assignor to Fr. Sauter A. G. Fabrlkelektr. Apparate, Basel, Switzerland, a Swiss iirm Application July 10, 1945, Serial No. 604,177 In Switzerland May 4, 1944 Section 1, Public Law 690, August s, 1946' Patent expires May 4, 1964 Claims. 1

My present invention relates to improvements when performing any switching operations, second to make provision for superimposing two switching operations (such as e. g., cutting in a motor and switching from first to second speed) so as to permit of performing same by a single hand lever, and third to afford means which permit of adjusting any speed or operative switching position alternatively after passing through the intermediate speeds appurtenant to the intermediate positions or, by omitting same, directly from neutral.

I attain these and related objects by the switch shown, by way of one embodiment relating to a selector switch for the control of a three-phase motor in suitable connection which permits of running same at two speeds forward and reverse, in the accompanying drawing, in which:

Fig. 1 is a wiring diagram of the switch and appurtenant devices, and

Fig. 2 shows the operative interpositions which may be effected by the switch lever.

The cams 2 for the selector contacts I as well as the special cam l actuating the auxiliary contant I, are secured to the hollow square shaft I. The latter is actuated by the joy-stick 6 swinging in the plane of Fig. 2 at right angles thereto, and is journaled in the bearing 11. The joy-stick 8 is also mounted rockable on the pivot I! in the guide It secured to the shaft I.

When rocking the joy-stick 8 on the pivot I, i. e. axially to the shaft l, the rod 1 housed in the latter is axially displaced therein and rocks the lever B. The latter is spring-loaded at l5, and controls the auxiliary contacts 9 and It. When pushing the lever B into the position E, the contact I is made, and when pulling same out into the position A, the contact II is broken. When the joy-stick is let loose in the position A or E, it is restored to neutral 0 through the action of the spring catch it.

The coil ll of the circuit-breaker" is connected across the holding contact I! in series with the auxiliary contacts in and 5, and the cut-in auxiliary contact 9 is connected in parallel with the holding contact l3. Contacts 9 and III are biased to closed position.

When the lever B is in the position 0 of Fig/2, the circuit-breaker I2 is broken. When swinging the lever B into any of the positions V1, V2 (forward) and R1, R2 (rearward), is is held by the dented disk 20. The auxiliary cam l is so adapted as to'open the auxiliary contact 5 v hen the lever B in Fig. 2 is in the position 0 or in positions intermediate of V1 and V: or R1 and R2, and to close same in these latter or switching positions.

When throwing the motor 14 into first or second speed, forward or reverse (Fig. 2), the coil current of the circuit-breaker control II is interrupted every time, and the breaker I2 drops oil, 1. e. the switching according to Fig.2 is done without current.

When starting the motor It, the lever B is first swung into the desired position of Fig. 2, and then rocked into engagement (position E of Fig. l) axially with the rod 1. During the swinging movement the switch l2 remains broken, and only closes when the lever 6 is rocked into the position E of Fig. 1. The lever 6 also, however, may be rocked into the latter position while swinging, whereby the switch 12 is cut in. In swinging the lever according to Fig. 2, the switch l2, in this latter case, is momentarily interrupted due to the breaking of the contact 5. When switchin the motor it off, the lever 6 is rocked or pulled forward (Fig. 1), thereby breaking the contact l0 and interrupting the control current of the switch l2. When swinging the lever 6 according to Fig. 2, without simultaneously rocking or pushing it back (Fig. 1), the switch 12 is opened in the neutral or intermediate positions thereof.

In order to permit of starting or cutting out the motor It also from another place, two push buttons 2|, 22 are provided for. When pushing the button 2|, the holding circuit of the switch I2 is interrupted. thereby dropping off the latter and keeping it open. When pushing the button 22, the switch I2 is excited and remains closed.

Any other wiring scheme than the onehere illustrated may be used, of course, whereby the number of rocking cams and switching positions may be changed as desired.

A particular advantage of the switch and control device described, aside from the currentless switching of the selector contacts, is that any speed or, respectively, switching position may be alternatively set either after having passed the intermediate speeds appurtenant to the intermediate positions or, by omitting same, directly from neutral.

What I claim is:

1. A hand operated cam switch for machine tools or the like comprising a switch housing, a hollow shaft rotatably journaled in said housin ing and engaging said loose rod, a coil-tripped circuit-breaker series connected with said selector contacts, a pair of contactors actuated by said spring loaded lever, said last named contactors being so connected to said single contactor and said circuit breaker, that said circuit breaker will be disconnected from said selector contactors and said single contactor when said contactors are rocked by said lever through actuating said loose rod, and said auxiliary cam being so shaped that when said selector cams and selector contacts are not in contact at a determined position of aforesaid lever said single contact and said circuit breaker will be temporarily disconnected, whereby selective current and noncurrent switchings of a motor drive for said tool ay be made.

2. In a switch as defined in claim 1, a hand lever engaging said hollow shaft when being swung in one plane and engaging said loose rod when rocked in one direction in a plane at right angles tothe former plane, and wherein said loose rod follows the rocking of said lever in the opposite direction under the action of said springloaded lever, the said lever being rocked to neutra'l whenever let loose.

3. A switch of the class described and according to claim 1, in which the said coil-trip controlled circuit-breaker comprises a holding contactor, and the said pairof contactors a cut-out 4 contactor, said holding contactor being seriesconnected to the latter, and said cut-out contactor being actuated by the rocking movements 01' the switch lever.

4. A switch as claimed in claim 3, in which the said pair of contactors comprise a cut-out contactor and a cut-in contactor, said single contactor being series-connected to the cut-out contactor and said holding contactor oi the circuit breaker, the said single contactor being open when the switch is in the no-load position.

5. A switch as claimed in claim 4, and wherein a push-button 2-point make-and-break for the independent control of the said circuit-breaker is provided, each of said latter contacts being series-connected to the holding contactor of the circuit-breaker and parallel-connected to the cutin contactor.

WALTER GROSSEN.

REFERENCES CITED The following references are of record in the 'file of this patent:

UNITED STATES PATENTS