Патент USA US2117507код для вставки
May 17, 1938.. F. SCHNEIDER 2,117,507 CONTACT DEVICE FOR ELECTRIC MASTER CLOCKS Filed Dec. 28, 1935 /A Patented May 17, 1938 2,117,507 ' ‘UNITED STATES PATENT OFFICE 2,117,507 CONTACT DEVICE FOR ELECTRIC MASTER CLOCKS Ferdinand Schneider, Fulda, Germany Application December 28, 1935, Serial No. 56,457 3 Claims. (Cl. 200-26) This invention relates to contact-devices for eration of secondary clocks from a master-clock. electric master-clocks which serve for operating secondary electric clocks. In heretofore known contact-devices used for this purpose current sented two examples of construction of my novel 5 carrying contact-springs have been used, said contact-springs carrying the operating current for the secondary clocks. These known contact~ devices have the disadvantage that they do not permit passage of a relatively strong operating 10 current so that only a small number of secondary clocks can be operated from the master-clock. Furthermore, known contact-devices are liable to . relax after some time, that is the contact-mem bers will lose their tension, and in consequence thereof the contact-pressure will soon be di minished with the result that a safe and reliable making-of the contacts cannot be attained with certainty for a greater length of time. According to this invention, the aforemen tioned current-carrying contact-springs are re placed by contact-levers which are amply dimen sioned in cross-section, said contact-levers co operating with contact-pins alternately brought 2 into e?icient sliding contact therewith. In order to attain a reliable and intimate contact, the free contact-levers are pivotally mounted atone of their ends, while the other of their ends are In the accompanying drawing I have repre contact-device for electric master-clocks, Fig. '1 being a front-view of a contact-device including 5 main contacts, spark-extinguishing contacts, and the electric circuits operated by said contacts, Fig. 2 a section along line A—B of Fig. 1, Fig. 3 a front-view of my novel contact-device without a spark-extinguishing circuit, the device being shown in condition of rest, and Fig. 4 the contact device shown in Fig. 3 in condition of making contact. In the ' construction of the contact-device shown in Figs. 1 and 2, the clockwork of the mas ter-clock is provided with an arbor 4 rotated at a constant speed by the clockwork and has an insulating plate 2 mounted on plate I by means of screws 3. On an extension of the arbor 4 pass ing through the plate I, there is mounted an insu lating tube 5 carrying the contact-disk 6. On so the latter is mounted a contact-pin ‘I and on either side thereof an insulated pin 8 and 9. To the plate I of‘ the clockwork there is further fastened an insulating bushing ill, a contact-bolt ll being mounted in said bushing. The bolt H forms the carrier of a sliding-spring l2, the free connected with each other by means of a tension end of said spring sliding on the periphery of a spring keeping together both contact-levers. contact-disk 6 in full contact therewith. The insulating plate 2 further carries the binding 00 0 posts or terminals l3, l4, l5, l6 and H, the con 30 Moreover, all of said contact-levers are properly ' supported in such a manner that one contact lever is being ?rmly pressed against its com panion contact-member, in the present case a contact-bar, whenever and as long as the other 35' contact-lever is in sliding contact with its com panion contact-member, that is in'the present case a contact-pin on a contact-disk. In conse quence of this improvement in the making of the contact, the contact-resistances will practically 40 be reduced to nil, so that the electric circuit as sociatedwith the contact will be able to operate a greater number of secondary clocks than had heretofore been possible. In addition to the afore mentioned contact-levers which serve for the 45 making of the main contacts, there are further provided two auxiliary contact-levers in parallel to the former, said auxiliary levers serving to sup press the formation of sparks at the main con tacts. These auxiliary contact-levers are like 50 wise operated by a common tension-spring under most reliable conditions with respect to making the contacts for the spark-extinguishing circuit. As the main and auxiliary contact-levers never change their contact position, these contact organs will warrant a permanently reliable op tact-levers 22, 23, 24 and 25 being pivotally mounted on said binding-posts or terminals by means of set screws I8, l9, 2| and 20, respective ly. The terminal l5 extends in upward direc- - tion into a current-bar 26, which carries at its upper end a contact-member preferably in the form of a silver-plate 21. The contact-levers 22, >23, 24 and 25 are re-inforced at their inner sur faces by means of silver-straps 22a, 23a, 24a and 25a and more particularly at those surfaces at which they come in contact with the contact-pin 1 serving for establishing the electric circuit for the operation of the secondary clocks. The aux iliary contact-levers 22 and 25 are arranged in front of said main contact-levers 23 and 24 at some distance therefrom and parallel thereto. Swinging motion of said auxiliary contact-levers is limited in’inward direction by ?xed stops 28 y and 29 on the insulating plate 2. At the height of the contactedisk 6 the inner distance between said two auxiliary contact-levers 22 and 25 is somewhat smaller than that between the main contact-levers 23 and 24. From the contact-bolt ll leads a connection 30 to the negative pole of 0 2 2,117,507 the battery 3i, the positive pole of the latter being connected by a lead 32 with the terminal IS; The connections 33 and 34 leading to the sec ondary clocks to be operated by the master-clock are connected to the terminals I4 and i6, respecé tively. From the lead 33 is branched off a lead 36 connected to one terminal of a coherer-resist ance 31, while the other terminal of the latter is connected to the terminal I 3 by means of the lead 38. The lead 3A is connected by the lead 39 with’ the one terminal of a second coherer-resistance 40, the other terminal of the latter being con nected to the terminal ill by the lead 4i. At the head-end of the main contact-levers 233 and 2d 15 are provided insulating rollers 42 and 43 to which a tension-spring 44 is fastened, said tension spring keeping together said two main contact levers atthis place. In like manner, insulating rollers fit and (it are provided at the head ends of 20 said auxiliary contact-levers and 2%, said in sulating rollers serving as anchorages for the ends of the tension-spring (ii. The construction shown in Figs. Z-i‘and 4 from that shown in Figs. 1 and 2 solely therein as well 25 that the auxiliary contact-levers as the coherer-resistances ill and dd, which are used as additional organs for spark-extinguish ‘ ing, are omitted. The operation of the abovedescribed device is 30 described in the following, the main contacts ac cording to Figs. 3 and 4 being described in in operative condition. All parts of the contact device are in the position shown in Fig. 3. ‘Upon rotation of the contact-disk 6 in direction of the 35 arrow, ?rst the insulating ‘pin ii on said disk will abut against the contact-lever’23 and press the latter away from its position of rest on the con tact-member 2i. Upon continued rotation of said disk 6 the contact-pin ‘i thereon will come in conductive connection .with the contact-lever 23 as shown in Fig. 4, thereby establishing an electric circuit 3i, 3!], ll, i2, 3, ‘l, 23, i4, 35, 34, I6, 24, 2i, 26, i5, 32, the secondary clocks being now moved forward one minute. This making of the contact according to this invention takes place without resistance which is due, on the one hand, to the greater tension of the spring 44 ?rmly pressing the contact-lever 24 against the front surface of the contact-member 21, and on the other hand, to the sliding of-the contact pin 1 in full contact along the contact-lever 23. Upon further continued rotation of the contact disk 6, now the insulating pin 9 abuts against the contact-lever 23, causing the contact-lever 23 to return into its inoperative position onto the con 55 tact-member 21, somewhat subsequently to the interruption of the contact between the pin 1 and the contact-lever 23. Subsequent contact be tween the pin 1 and the contact-lever 24 is ef fected in like manner to cause change‘ of. direc 60 tion of the current supplied to the secondary clocks. In order-to suppress sparking at the con tact, the contact-device is constructed as shown in Figs. 1 and. 2. In this construction of the contact-device the coherer-resistance 31, is con 65 nected across the terminals of the auxiliary con tact l3 and of the main contact ll by way of the leads 36 and 38; while the 'coherer-resistance 40 is connected across the terminals of the auxiliary contact I1 and of the main contact I6 by way of 70 the leads “and II. Prior to the positionv of operation, according to Fig. 4 which shows a con struction of the contactIdevice' without spark extinguishing means, the auxiliary contact-lever 22 which abuts against the pin 28 had been _ gripped by the contact~pin l and moved away from'said pin 28. By this an electric circuit is at ?rstpreliminarily established by way of the coherer-resistance 31 and after some time the contact-pin ‘i abuts against the main contact lever 23 to fully establish the electric circuit. During the operation of contacting both. con tact-levers 22 and 23 will be in contact with the pin 1. Upon further rotation of the contact 10 disk 6 the main contact-lever 23 will come out of contact with the pin l and ?rst interrupt the circuit. The electric circuit, however, still re mains closed by way of the coherer-resistance 3'! and somewhat later the circuit is fully inter 15 rupted, when the contact-pin ‘l comes out of con tact with the auxiliary contact-lever 22. During the subsequent operation, the connection is made in like manner by way of the other two contact~ levers and ‘.25 in cooperation with the coher» 20 er-resistance 6U. Owing to the employment of contact-levers which are operating resil-l iently one against the other, there will be se cured a proper and uniform operating motion of the contact-device, with the result that in the ‘ constructions shown in’ Figs. 1 and 2 sparking will be efficiently suppressed at the contacts and the latter remain free of the formation of oxide. I claim: 1. A switch mechanism for electric master 3,0 cloclrs comprising, a disk having a conducting surface and rotated at constant speed, means to connect the conducting surface of said disk to a source of current, a pair of rigid contact arms pivotally mounted adjacent said disk, one upon each side of the axis thereof,_a pin secured to said disk in conducting relationship with the con ducting surface thereof and engageable alter nately with said contact arms, a tension spring having its ends secured to but insulated from the ‘free ends of said arms and operable to swing said arms toward the axis of said disk, and a'?xed contact element arranged alternately to make electrical contact with said contact arms and form a stop for limiting the swinging movement of said arms toward the axis of said disk. 2. In a switch mechanism for master-clocks, the combination of a disk rotated at a constant speed, means to connect one terminal of a source of current to said disk, a ?xed contact, means to connect said ?xed contact to the other terminal of the source, a pair of pivotally mounted rigid’ contact arms, a single spring for swinging said arms toward one another and into engagement with said ?xed contact, and means on said disk alternately engageable with said arms to move said arms away from said ?xed contact against the tension of said spring and thereafter to make an electrical contact with the arm. 3. In a switch mechanism for master-clocks of 60 electrical clock systems, the combination of a ?xed contact, a. pair of pivotally mounted rigid contact arms, resilient means to force said arms into contact with said ?xed contact, and means operable alternately to move said arms contact with said ?xed contact, said means prising insulating means for engaging said while they are in close proximity to said from com arms ?xed contact, and conducting means for completing electrical circuits through said arms after the 70 .latter have been moved from contact with said ?xed contact. FERDINAND SCHNEIDER.