Патент USA US2406818код для вставки
Sept. 3, 1946a G. H. EFÈB 2,405,818 ROTARY SWITCH Filed May 7, 1.945- 2 sheets-sheet, 1 l ¿Sw„6 Ñäaßy 1|van., fil„.,flusg i @È ( _ 49 á_ ._ _`=_ _ _ä„ 0 INI/EN TOR. 'G50/Paf H. £625 B?ßßßy/ A’TTÚHA/FY Sept. 3, 1945. @_ H, ERB _ - y 2406,81@ ROTARY SWITCH Filed May "i, 1945 Ú . ~\14 , ~ 2 sheets-sheet 2 vx BY INVENTOR. kG50/PGE H. f/Pß ' “ ATToRM/FY v Patented Sept. 3, 194:6 2,406,818 UNITED STATES PATENT OFFICE 2,406,818 ROTA-RY SWITCH George H. Erb, South Orange, N. J., assigner to` Federal Telephone and Radio Corporation, Newark, N. J., a corporationy ofDelaware Application May 7, 194.3, Serial No. 485,969 1 Claim'. (Cl. 204)--6) 1 2 The present invention relates to electrical switches and more particularly to a multi-posi tion switch having an indexing mechanism in-= portion I3 of member I2, and a plurality of rivets I8 respectively connect these outer contacts It with exterior terminals I4. Another raised cir corporated therewith. cular portion I5 of insulating member I2 spaces Although indexing vdevices for switches are CF1 and retains in position outer terminals I4. well known in the> art, it is one purpose of the On one side of insulating. member 20 is a present invention to provide an improved assem raised surface portion 2| shaped so as not to in~ bly inwhich the switch contacts and the index terfere with the positioning of contacts Bü by pins 32` (see Fig. 3). A slot in this portion 2l receives a pin 2'2 which extends through shaft 5, and is securely positioned thereby. Thus a rota tion of shaft t will correspondingly rotate insu ing mechanism are enclosed as a unit within a housing of relatively smallV size. It is a further object of the invention to pro vide an indexing mechanism that will have a positive action but at the same time can be actu ated with a minimum of effort. It is another object of the invention to provide an indexing mechanism that will maintain the switch contacts in the position selected regard lating member 2t! as well as associated inner con tacts 30. A front cover i0 for the assembly fits against insulating member i2 and has a bushing S en closing shaft 6. This bushinfr may be externally less of vibration or shocks that may be applied threaded to permit connection of the switch as to thev switch housing or to the control structure. sembly to a suitable mounting. Between bushing The invention still further contemplates an 20 8` and the raised surface 2'I of insulating member indexing device that includes interchangeable 2,5 are a washer 28 and a pair of spacers 24 parts, so that by a proper selection of such parts the indexing mechanism can be made to respond to operating forces of any desired magnitude. and 2t. rI'he extremity of shaft E is formed' with a cup* shaped opening as» shown in Fig; l, and a tube Other objects and advantages will be apparent from the following description of a preferred form of ther invention and from the- drawings, in which: ' cradle 313i is> insertably positioned in this open ing. A'v tubular extending portion 35 of shaft 6 is formed' axially thereof and passes through an opening 3l in tube cradle 34 (see Fig. 5). The Fig. 1 is a sectional View of a switch assembly extending portion is peened over to securely in accordance with the present invention; 30 position on shaft 6 the cradle 3d and the insu Fig. 2 is a view along 2_2 of Fig. 1; lating member 20'. Fig. 3 is a View along 3_3. of Fig. 1, showing A spring retaining tube 4B is securely attached the inner rotor assembly; to tube cradle (iii by means such as soldering, Fig. 4 isy a view along il-t of Fig~ 1, showing the tube cradle being shaped to receive the tube the outer contact assembly; 40 as shown in Fig. 5. A spring 'l2 is compressibly Fig. 5 is a sectional View of the tube cradle of positioned in tube 40, and a pair of spring guides Fig. l. 44 and 45 at the ends of spring 4i! respectively In Fig. 1 is shown a rotatable shaft 6 on which Contact an upper ball bearing 4S and a lower ball is mounted an insulating member Ztl supporting bearing 43. A rear cover 38 adjoins insulating a plurality of inner switch contacts 30. A plu member i2 and with this member and front rality of rivets 32 respectively position inner con cover lil form a compact housing unit for the tacts 30 on insulating member 20, this construc switch and indexing assembly. tion being also shown in Fig. 3. Each of these Rear cover 38 is constructed as best shown in inner- contacts 30 comprises a pair of flexible Fig. 2. A recess 41 on the inner surface thereof spring elements disposed in substantially par is designed to receive the spring retaining tube allel relationship and having ears on the outer corners thereof to facilitate engagement with stationary outer contacts I5, as will hereinafter be described. three niches 49, 50 and 5I shaped to receive the ball bearing 46 which is partially enclosed within A ring-shaped insulating member I2 (see also Fig. 4) supports and positions a plurality of outer stationary contacts I6, this ring-shaped insulat ing member I2 forming a part of the assembly housing, as can be seen from Fig. 1. The outer contacts I6 are spaced apart by a raised circular 40. In the upper portion of recess 41 are formed spring retaining tube 40. Ball bearing 48 rides along the smooth lower surface of recess 4l as shown. Threaded openings 52 on cover 38, insu~ lating member I2, and the front cover I0, receive screws (not shown) which when tightened tend to form a relatively dust-proof enclosure for the assembly, 2,406,818 4 3 From Figs. 1 and 3 it can be seen that a rota relationship of the switch contacts I6, 30. Since tion of the shaft E will rotate the insulating member 2i) and the inner contacts 3i). These contacts 30 will then selectively bridge or con~- it can also be seen from Fig. 1 that the spring nect the outer contacts i6 (Fig. 4) . other shock applied longitudinally along the axis of the shaft will be taken up by the spring con The present disclosure is not limited to any combination or arrangement of circuits, but it will be obvious that a large number of switching variations within the scope of the invention can be ob tained by altering the spacing of the outer con tacts IB and/or the design of the inner con tacts 30. As will be seen from Fig. l, each spring contact 30 is designed as a pair of flexible sections dis posed iace to face so that an outer contact It may pass between these sections upon rotation of shaft this construction insuring an electri cal connection between the inner and outer con tact elements. The ears on the corners of the retaining tube 4i) does not directly contact the inner surface of rear cover 38, any vibration or tacts 353 and i6 without disturbing their circuit relationship. since the applied force is at right angles to their direction of rotation. It should be noted that due to the relatively short radius of the indexing mechanism, little operating force need be applied to the shaft B to actuate the switch assembly. Furthermore it will be apparent that by removing the rear cover 38 the ball bearings 46, 48, the spring guides 44, 125, and the spring 42 may be quickly removed from the tube 42. By selecting a spring having a different degree of resiliency, the switch assem bly can be made to respond to any desired oper inner contacts 3@ are to guide the outer contacts 20 ating force, this change being effected without disturbing in any way the switch contacts 30, i6 in passing between the sections of such inner I6, and without the necessity of breaking the contacts. circuit when the spring replacement is made. ssume now that the indexing mechanism is While I have described above the principles in the position shown in Figs. 1 and 2, that is, or my invention in connection with speciiic ap with the ball bearing ¿it of spring retaining tube paratus, it is to be clearly understood that this blt] in the central niche 5D in recess 4l of rear description is made only by way of example and cover Due to the tension of spring 512, spring not as a limitation on the scope of my invention guide ‘iii exerts pressure on bearing ß'iEì to hold as set forth in the objects of my invention and bearing ¿it in niche Sii, thus positioning tube 11E! in place in recess Lil. The resultant pressure of 30 the accompanying claim. I claim: spring in the opposite direction is exerted In a. compact rotary switch and indexing mech against spring guide 'l5 and ball bearing lill, but anism, a housing having a substantially dust since bearing ¿i8 rides along the smooth lower proof recess therein, said recess comprising two surface of recess no opposition is offered by portions, one portion being substantially cylin bearing d8 to a rotation of shaft ii. drical and containing a plurality of radially pro When it is desired to actuate the shaft 6 to another of its contact positions, the angular movement of tube i@ will force ball bearing 455 against the sloping surface of niche 55, and suf jecting contacts, and the other portion being sub stantially the shape of two opposing sectors tension of spring ¿52. Thus a positive indexing operation results, and since the spring ¿i2 permits mechanism within said other dual-sector-shaped wherein the arcuate surface of one sector is ficient pressure will result in a depressing of ball 40 smooth and the surface of the other sector con tains a plurality of spaced-apart axial grooves, a bearing Lie into tube do for a suflicient distance rotatable sl'iait supported by said housing co to permit the upper surface of bearing ¿i6 to clear the sharp edge between niches 5i] and El (or 43, axial with said recess, one or more conducting depending on the direction of rotation of shaft elements carried by said shaft for bridging adja f5). As soon as the bearing @il enters niche 5| 45 cent radially projecting contacts in said cylin it will center the tube 40 in such niche due to the drical portion of said recess, and indexing the tube to have a limited movement trans versely of shaft f5 without the ball bearing 46 being displaced from the niches 4S, 50 and 5I, ie disclosed structure will resist a shock or vibration applied to the shaft or housing in a direction perpendicular to the axis of the shaft and having a tendencyto disturb the selected recess portion comprising a transverse bearing holder mounted on the said shaft and a pair of bearings, one of said bearings directly engaging said axially grooved arcuate surface, and the other of said bearings directly engaging 'said smooth arcuate surface. GEORGE H. ERB.