US2769941A - Rotary coaxial switch actuating mechanism - Google Patents

Description

Nov. 6, 1956 w. ELLIOTT ROTARY 'COAXIAL. Filed Dec. 5, 1951.

SWITCH ACTUATING MECHANISM 2 Sheets-Sheet 1 1571 5 his?" mum? 72. 522mm .z-akyafi 5 E Nov. 6, 1956 w. R. ELLIOTT 2,769,941

ROTARY COAXIAL. SWITCH ACTUATING MECHANISM Filed Dec. 5, '1951 2 Sheets-Sheet 2 F1 q. 6

IifiVEITZQT WWI/am 2?. Elliott United States Patent ()fiiice ROTARY COAXIAL SWITCH MECHANISM William R. Elliott, Mayfield Heights, Ghio,

Thompson Products, Inc., Cleveland, Ohio, tion of Ohio Application December 5, 1951, Serial No.

12 Claims. (ill. 317--157) ACTUATING assignor to a corpora- This invention relates to a more preselected positions.

Many of the actuating mechanisms rotary coaxial switch tin-uously rotatable driving member rather than by means of a step-by-step driving member.

hen a continuously rotating driving member, such switch rotor past the preselected position.

With a step-by-step actuating mechanism, wherein angular momentum of the driving member is not .a problem the switch rotor toward the preselected position, after the switch rotor has been rotated into a first preselected range in advance of the preselected posit-ion and by resisting movement of the switch rotor past the preselected position, within a second preselected range.

retarding force is exerted on the motor for only 15 beyond the preselected position. A detent such as used with a step-by-step drive normally exerts ins-ufiicient =retarding torque on the motor. If the retarding torque is made s-ufiiciently high to be capable of bringing the motor to a stop Within the 15, it has been found that a practical motor is unable to overcome the retarding torque in starting.

It is, therefore, a further object of the present invention to provide Patented Nov. S, 32956 Another object of the present invention is to provide novel indexing mechanism for a coaxial switch in which the driving means is decoupled from the switch rotor at a selected switch position and in which separate and independent position locating means thereafter moves the switch rotor and the driving means to their final respective preselected locations.

It is a still further object of the present invention to provide a retarding torque for the rotary driving member within the operative range of a detent and during the switch rotor accelerating position of the detent range.

'It is a yet further object of the present invention to provide means affording a free start for the rotary driving member before the switch rotor detent load is applied thereto.

It is yet another and further object of the present in vention to provide means for relieving the switch rotor of the driving force of the angular momentum of the rotary driving member when deenergized adjacent a preselected switching position.

Other novel features which I believe to be characteristic of my invention are set forth with particularity in the invention itself, however, both as in connection with panying drawings in which:

Figure l is a diagrammatic view partly in section of an actuating mechanism embodying the novel principles and teachings of the present invention as it would be applied to a single pole, double throw rotary coaxial switch;

Figure 2 is a fragmental sectional view taken along the line II-II of Figure 1 and showing the switch detent mechanism in elevation;

Figure 3 is a schematic view taken along the line III III of Figure l and showing the motor detent mechanism in side elevation;

Figure 4 is a cross-sectional view taken along the IV-IV of Figure 1 illustrating a loose cording to the present invention;

'Figure 5 is a schematic wiring diagram illustrating the control system for the motor;

Figure '6 is a diagrammatic illustration representing the action of the two detent mechanisms and the wafer switch according to the present invention;

Figure 7 is an enlarged diagrammatic illustration of the detent cam shown in Figure 3;

Figure 8 is a somewhat diagrammatic illustration partly in section of a modified form of actuating mechanism; and

Figure 9 is a schematic wiring control system for the mechanism The present invention is with a rotary coaxial switch having a rotor which is deone or more preselected positions to complete one or more circuits. it will be readily appreciated that in a coaxial-type switch much mor positioning of the switch rotor is required than in the ordinary rotary switch. It is the particular problems which are met in the coaxial-type switch which the present invention is specifically designed to meet, and the actuating mechanism according to the present invention is therefore illustrated as it might by way of example be applied to a rotary coaxial switch.

The actuating mechanism of the present invention is also particularly adapted for use with a control system for selectively indexing the switch rotor to one of a pluthe accomline coupling acdiagram illustrating the of Figure 8.

3 rality of preselected switching positions. The invention is, therefore, illustrated as it might be employed with such an indexing control system by way of example and not by way of limitation.

Referring particularly to Figure 1, by way of example, a single pole, double throw rotary coaxial switch 10 is operated by an actuating mechanism generally designated by the reference numeral 11. The rotary switch 10 comprises a stationary switch body 12 and a switch rotor 13 rotatably mounted therein.

The switch rotor 13 has an inner conductor elbow 14 having a reduced diameter pin 15 at one end extending axially of said switch rotor for continuous contact with prongs 17 of the inner conductor 18 extending axially of the rotor and axially of the main fitting 19. The inner conductor elbow 14 is carried in the rotor 13 and is insulated from the metallic plug 20 of the rotor by means of insulation 21. The inner conductor 18 of the main fitting 19 is centered axially of fitting 19 by means of insulation 22. The switch rotor 13 is turned to selectively establish a circuit between the inner conductor 18 of the main fitting and the inner conductors 23 and 24 of the branch fittings 25 and 26. Each of the coaxial fittings 19, 25 and 26 may be provided with suitable means for connection to coaxial cables, as threads (not shown).

The rotor 13 is, therefore, intended to be moved to accurately determine angular positions. One such predetermined switching position, which may be designated the A predetermined switching position, is shown in Figure 1. The other B predetermined switching position is with the rotor turned through 180 to make contact between the inner conductor elbow 14 and the inner conductor 24 of the branch fitting 26 to establish a closed circuit from main inner conductor 18 to branch inner conductor 24.

The actuating mechanism move the switch rotor 13 selectively into the predetermined switching positions.

In the first embodiment of the invention, the switch rotor 13 is directly connected to a shaft 30 which is adapted to be driven by means of a rotary driving member such as the rotor of an electric motor 31. The drive connection between the motor 31 and the shaft 30 includes a motor shaft 32, pinion 33, driving gear 34-, shaft 35, associated pinion 36, driving gear 37 and shaft 38.

In order to accurately position the switch rotor 13 in the preselected switching positions, a first switch detent mechanism indicated generally by the reference numeral 40 is provided. In general, the switch detent mechanism has a central position which corresponds with the desired predetermined switching position and an effective range of angular positions in which it is operative to move the switch rotor to the central predetermined switching position desired.

By way of definite example, the detent may have an over-all range of 30, with a range in advance of the predetermined switching position of 15 and a range beyond the predetermined switching position of 15. By way of example, this range of detent action may be accomplished by means of a detent gear 41 fixed to the shaft 30 and having twelve peripheral teeth.

As illustrated in Figure 2, the detent gear 41 is controlled by a pair of opposed arms 42 and 43 illustrated as being pivotally mounted on the coaxial switch housing 12 by means of bolts 44. The arms 42 and 43 carry rollers 45 which are urged against the gear by means of springs 46 anchored at one end on the bolts 44 and at the other end on the free ends 47 of the arms 42 and 43. The springs 46 urge the rollers 45 into the bottom of the grooves 48 between the teeth 49 of the gear 41. Thus, when the motor 31 turns the shaft 30 to such a position that the rollers 45 are in overbalanced relation to the centers of a pair of opposed teeth, the springs 46 will tend to accelerate the shaft 30 by camming the rollers 45 inwardly along the sloping faces of the teeth and to,

11 is designed to accurately A! 6B7! hold the rollers at the bottom of the positions shown in Figure 2.

This action is indicated diagrammatically in Figure 6 by means of the saw tooth designated by the reference numeral 50 which is intended to represent the roller contacting faces of the gear 41, linearly developed. Thus, movement of one of the detent rollers 45 up the sloping face of a tooth 49 is represented by movement from a to b, from c to d, and from e to 1, etc., while travel down one of the sloping faces of one of the teeth 49 is represented by movement from b to c, from d to e, and from grooves 48 in the to g.

It will thus be seen that in the case of a simple 30 detent, such as illustrated in Figure 2, a retarding force is exerted on the motor for 15 beyond a predetermined switching position, i. e., from c to d for predetermined switching position A. In order to stop the motor so that the switch rotor 13 can return to its desired position, such as its A position (corresponding to point e in the diagram of Figure 6), the retarding torque must be sufficient to overcome the angular momentum of the system and bring the shaft 30 to rest before position d is reached. If the retarding torque is made sufficiently high to accomplish this purpose, it has been found that no conveniently small size motor is able to overcome this retarding torque. It will be apparent, however, that if aretarding torque is applied for 30 instead of the 15 between 0 and d provided by the detent 40, the retarding torque need only be half of its former magnitude and still stop the motor.

According to the present invention, the angular range over which a retarding torque is exerted on the motor is increased by providing a second detent-type mechanism which will be operative to exert a retarding torque on the rotor of the motor 31 in advance of the predetermined switching position A corresponding to c in Figure 6. A possible manner of operation of this second detent means is indicated by the line 51 of Figure 6.

For the case where the gearing has a reduction ratio of 6 to l, a suitable motor retarding detent is indicated generally by the reference numeral 52 in Figure 3. This second detent comprises a cam 53 mounted with the gear 34 on the shaft 35. The cam 53 is controlled by means of a cam follower 54 rotatably carried by an arm 55 pivoted at one end to a fixed support 55'. The cam follower is resiliently urged against the face of the cam 53 by means of a spring 56 secured at one end to the free end 57 of the arm 55 and at the other end to a mounting strip 58 which is illustrated as being secured to the housing of the motor 31. It will be observed from Figure 7 that the cam 53 has a diminishing diameter indicated by the reference numeral 60 through a sector of about corresponding to the lines aa to bb, ee to ff, etc. in Figure 6, an increasing diameter for a further 90 sector indicated generally by the reference numeral 61 corresponding to the lines bb to cc, ff to gg, etc. in Figure 6, a 90 sector of maximum and constant diameter indicated generally by the reference numeral 62 and corresponding to the lines cc to dd, gg to M1, etc. in Figure 6, and region of gradually decreasing diameter 63 corresponding to the lines dd to ee, hh to ii, etc. in Figure 6. In Figure 6 the lines ee to ff correspond to the lines aa to bb and is the beginning of a second cycle, and lines ff to gg correspond to lines .bb to as in Figure 6. It will be understood that one complete revolution of the cam 53 corresponds to 60 of angular rotation of shaft 30 and detent gear 41 thereon. due to the reduction gearing ratio of 6:1 between the shaft 35 and the shaft 30.

The operation of the actuating mechanism 11 will now be readily understood with the aid of the'wiring diagram in Figure 5 which illustrates a pair of supply conductors 65 and 66 leading from a suitable source of voltage (not shown). The supply conductor 66 leads directly to the motor and the supply conductor 65 leads to a double throw switch 67 having a pair of contacts 68 and 69 conmeeting to a wafer switch '70 which, as shown in Fig. l,

may be mounted on the shaft 30. The inner member 71 of only the retarding torque exerted by the upwardly slopthe switch 701s adapted to rotate with the shaft 30 while ing teeth 49 of the detent 40 from e to f exerts a re the outer member 72 is stationary. A stationary contact tarding force on the motor. This retarding torque is 73 is connected to switch contact 68 by means of a coninsllthcl'ent to p the motor, even if it Should he deenductor 74 and stationary contact 75 of the wafer switch 5 ergized for some reason. The stopping points are thus is connected by means of conductor 76 to the switch can located 60 apart as a result of the shape of the second tact 69. The position of the switch 67 shown may cordetent cam 53.

respond to the preselected switching position A show One of the principal features of the present invention in Figure 1 with the inner conductor elbow 14 making is the provision of a sloppy or loose coupling indicated circuit with the inner conductor 23 of the branch fitting 16 generally y the referents n ral 83 between h f 25 11318 corresponds generally with position on line J and 1his couphhg 1S deslghed to allow some 56 and cc on line 51 in Figure 6 a d i arbitrarily desigfree play between the action of the switch detent 40 and nated the 0 position of shaft 30. If the switch 67 is now the motor detent 52 As Shown in Figure in the P actuated to ake Co t t i h th t t 69 d Close ticular construction illustrated, the shaft 38 has at its a su ly i uit t th stationary t t 75 f th wafer end a pair of arcuate slots 84 lying on diametrical sides switch 70, the motor 31 will be energized to turn the shaft a longitudinal cyhhdfihal hOfB- The Shaft 30 s 30. The circuit extends f o supply conductor 65, a reduced diameter end portion 85 rotatably disposed through switch 67, conductor 76 to stationary contact 75, Within the Cylindrical hOfe 0f the end f h haft 38. and through the inner member 71 of the wafer switch to A P 85 extends transversely through the Pdllced Y o du to 78 d th h th motor 31 to h supply indrical end portion 35 of the shaft 30 to couple shaft conductor 66. As the shaft 30 is turned through the first 3h With the Shaft 15", a ll 45 f h fi detent travels up h fa e f a With the shaft 38 rotating counter-clockwise, as seen tooth from c to d and the cam follower 54 travels over in Figure 4, it Will he apprectatfid that th@ Shoulders 37 the maximum diameter sector 62, from cc to dd in Figure afforded by the slots 34 Will bear against the P 85 and 6 The switch detent roller 45 is then accelerated down thus drive the Shaft through the reduced Cylindrical the sloping face of the tooth, from d to e in Figure 6. P tion 85 thereof- When the shaft 30 has turned to 45, the roller 45 and Whfih at the Positich of Shaft 39, adjacent cam follower 54 will have reached a point corresponding Point on 11116 31 in Fight the retarding term? 15 to P n 7 an ff In Figure 6 An accelerati g force is exerted on the snaft 35 the shaft 3h is free to continue exerted on the first detent roller and a retarding force 30 accelerating t0 the Point 0 011 line 56 under the actihh is exerted by the cam follower 54, but since the motor has cf tm springs 45 and Duets of the Switch dfiteht not yet been deenergized, the switch rotor continues to h the P 36 g ch'tthtehclochwise relative to the rotate. When the shaft 30 has rotated through 165, it stottsd end 33 of tha Shaft It Witt he hppreciatfid will be appreciated that the arcuate slot 80 on the periphthat 0f P bhtweeh thh Shafts and 33 Win 136 my of h inner member 71 is now approaching the 35 suffic ent to accommodate the maximum desired relative tiohary Contaht 75 If the slot Suhtends an angle f Shh rotation of the two shafts to permit movement of the stantinily 30, b the time the h ft has turned through switch rotor 13 to the preselected position B before 165", contact will be broken between the stationary con- Shaft 33 reaches POStttOn If the motor is Completely tact '75 and the inner member 71 to disconnect the supply stohped before the Shaft 33 has achieved an angular conductor 65 from the motor 31 to deenergize the motor. 40 Position col'lespcnding to on line the Shaft 33 Th point f motor shuhoif is indicated by the sharp f ll is returned to the position ml by the action of the motor at n in the line 81 in Figure 6. Because of the 30 slot detent 52, the loose coupling 33 allowing this reverse ro- 80, it will be understood that the motor cannot be again tatlon as the Shaft 39 Centers at the Position correspond energized with the h ft 30 has turned to 195, or mg to 0 and the switch rotor position B. If the motor beyond h predetermined Switching position y 5 has not stopped rotating before the shaft 38 has reached in the present Case, the rotary driving msmher or the position 00, the switch detent action between 0 and p rotor of the eiectric motor 31 will continue to rotate tends to resist rotation of the shaft 36 and the shaft 38. due to its angular momentum. It is desired to Stop the If the motor stops before shaft 30 reaches 1, the switch h ft 30 at the position y As the detfint Wheel of the detent 1s efiective to return the shaft 38 from position switch detent reaches position n, the shaft 30 is pulled PP Position With the Pin 85 of th loose Coupling ahead while the motor detent cam follower 54 is exerting bearing agamsf the Shoulders and than the motor a retarding force from 1m to 00, corresponding to selector detent means 15 effecnve to turn the shaft 3 through 1 f h 6 Cam in Figure If the motor is Stopped a further 15 from 00 to n/z, the shart 38 turning clockf pcsition on line 81 in Figure 6, When the Sufism wise to move shoulders 87 away from pin 86 and shoulder my Contact 75 would again chntact the inner switch 55 89 toward pin 86. It should be understood that with memhal. 71 of the Wafer Switch 70, the Springs 46 and a roose coupling the switch '10 in the embodiment illusthe roiiers 45 of the first detent would he opelahve to trated is responsive to the angular posi ion of the shaft return the shaft 30 to the central position 0 correspond- 30 and t angular Position of the Shaft The ihg to the preselected Switching Position of the final rest positions of the rollers 45 and cam follower axial switch rotor 13. It will be appreciated that since are mfhcated Flgum the Cam fonower Circle a retarding torque is exerted by the motor detent 52 emg designated 54 and the roller circle being desigfrom 165 to 180 and since the switch detent means is nafed operative f to to retard the rotary driv 1f the switch is moved to again close the contact ing member, oniy one-half of the retarding torque is 3 with the conductor 65, the coupling being in its loose necessary to stop the shaft 30, as compared with the non-driving relation affords a 15 free acceleration to torque which would be necessary without the motor dethe motor 31 bhfofe a firm driving Connectihh is estabt t m a It h b fou d th t a uitabl motor lished between the shaft 38 and the shaft 36 with the is available to overcome this reduced retarding torque pin 86 again bearing against shoulders 87. The loose in starting. coupling between the shafts therefore not only improves it will be observed that at positions 2, i and m in Figthe action of the switch and motor detents, but also afure 6, which correspond to angular positions of the shaft fords a relative 30 which are odd multiples of 30, the second detent 52 permitting a still larg does not exert a retarding torque on the shaft 35, For The. second embodiment of the invention illustrated example, from dd to 1? in Figure 6 the second detent is schematically in Figures 8 and 9 utilizes a magnetic brake continuously tending to accelerate the shaft 35. Thus, instead of the motor detent 52.

' otherwise has the same parts as the embodiment of Figure 1, and the similar parts have been designated with similar reference numerals.

The brake 90 is illustrated schematically as being applied to the motor shaft 32 and may be of any suitable conventional design, such as a solenoid brake.

The operation of this modification will be apparent from Figure 9 where the magnetic brake 90 is represented by the inner circle and the motor 31 by the outer circle. The operation of the wafer switch 7% is the same as previously. The magnetic brake is normally in braking position when deenergized and remain in braking deenergized position when the switch 91 is closed. The circuit extends through supply conductor 65, conductor 92, the magnetic brake 90, conductor 93, and open contacts 94, 95 of solenoid switch 96 to supply conductor 66. When switch 67 is thrown to index the switch rotor, circuit is closed from supply conductor as through conductor 76 to contact 75 of switch 70 and through conductor 78, motor 31, conductor 97 and the solenoid coil 98 of solenoid switch 96 to supply conductor 66. The solenoid coil 98 is then effective to raise armature 99 and close contacts 94, 95, and release the brake, thus allowing the motor to start. Some free starting time may be afforded by the loose coupling 83. However, only the resistance of the switch detent is to be overcome, so that it is not necessary to stop the motor before the rotor has reached the preselected switching position, as would be required to give a 15 free start for the motor.

With switch 67 thrown to make circuit through contact 69, when the slot 80 has reached contact 75, the motor circuit is opened. The solenoid switch 96 is then deenergized to drop the armature 99 and open contacts 94 and 95 and thus to cause the brake 9% to be applied to shaft 32 to stop the motor. The switch detent is free to move the rotor to the preselected position by virtue of the loose coupling 83 as before.

While I have shown certain particular embodiments of my invention, it will, of course, be understood that I do not wish to be limited thereto, since many modifications may be made, and I, therefore, contemplate by the appended claims to cover all such modifications as fall within the true spirit and scope of my invention.

I claim as my invention:

1. Indexing mechanism for selectively positioning a rotor with respect to a plurality of surrounding stations comprising a rotatable drive member, means for actuating said drive member, means loosely coupling said drive member to said rotor for affording only a predetermined amount of relative rotation between said drive member and said rotor and for thereafter affording a direct positive drive therebetween, means for dcenergizing said actuating means when said rotor has angularly moved to a preselected relative general position with respect to said station, means for thereafter moving said rotor to a precise relative position with respect to said station, and separate means for applying a braking force to said rotatable drive member, said loose coupling means affording sufiicient relative rotation between said braking means and said rotor to accommodate positioning of said rotor independent of the action of said braking means.

2. Indexing mechanism for selectively positioning a rotor with respect to a plurality of surrounding stations comprising a rotatable drive member, means for actuating said drive member, means loosely coupling said drive member to said rotor, means for deenergizing said actuating means when said rotor has angularly moved to a preselected relative general position with respect to said station, means for thereafter moving said rotor to a precise relative position with respect to said station, and separate means operative over a range of positions on either side of a central position for applying a braking force to said rotatable drive member, and for thereafter returning it to a predetermined relative position with respect to said rotor, said loose coupling means accommodating relative I rotation between said separate braking means and said rotor positioning means for accommodating the return of said rotatable drive member to said predetermined relative position independent of the rotor positioning means.

3. indexing mechanism for selectively positioning a rotor with respect to a plurality of surrounding stations comprising a rotatable drive member, means for actuating said drive member, means loosely coupling said drive member to said rotor including a pin and slot connection, means for deenergizing said actuating means and substantially simultaneously applying a braking force thereto, and separate means for advancing said rotor to a precise relative position with respect to said stations and bringing said rotor to rest at such precise position, said pin and slot connection affording sufficient relative rotation between said drive member and said rotor to accommodate independent positioning of said rotor after the braking of said drive member.

4. An actuating mechanism for moving a rotor to a preselected position, comprising a rotary member, means for driving said rotary member, means for energizing said driving means, a shaft driven by said driving member to move the rotor toward the preselected position, means responsive to the angular position of said shaft to disengage said energizing means to deenergize said driving means at a preselected angular position of said shaft in advance of the preselected position of the rotor, detent means for moving said shaft from deenergized position to the preselected position, means for retarding said rotary driving member in advance of the preselected position to resist the angular momentum thereof, and a loose coupling comprising a pin and slot connection between said shaft and said driving member to permit the detent means to move the rotor to preselected position in spite of retarding of said driving member in advance of said preselected position.

5. In combinationin a rotary switch, a switch rotor in an actuating mechanism for moving the switch rotor to a preselected switching position, said actuating mechanism comprising a first detent means operative to center said switch rotor on the preselected angular position and operative when said switch rotor is within a preselected angle in advance of said position to move the switch rotor to said preselected position, a rotary driving member for moving said switch rotor toward said preselected position, means for energizing said rotary driving member, and means for disengaging said energizing means when said switch rotor has reached a preselected angular position within the range between the preselected advance angle of operation of said first detent means and the switch rotor preselected switching position, and second detent means operative between switch rotor rotary-drivin mernber-deenergized position and switch rotor preselected switching position to resist the angular momentum of said rotary driving member.

6. In combination in a rotary switch, a switch rotor and an actuating mechanism for moving the switch rotor to a preselected switching position, said actuating mechanism including a first detent operative to center said switch rotor on the preselected angular position and operative when said switch rotor is within a preselected angle in advance of said position to move the switch rotor to said preselected position, a rotary driving member for moving said switch rotor toward said preselected position, means for energizing said rotary driving member, means for disengaging said energizing means when said switch rotor has reached a preselected angular position in advance of said preselected switching position of the switch rotor, a second detent means operative in advance of switch rotor preselected switching position to resist the angular momentum of said driving member, and a loose coupling between the rotor and said first detent means to facilitate operation of said first detent means.

7. In combination, a first shaft, a second shaft for driving said first shaft, means for driving said second shaft having considerable angular momentum in operation, detent means operative Within a preselected range of angular positions of said first shaft to accelerate the shaft in its direction of rotation to a preselected angular position of said shaft, means for means prior to the to resist the angular momentum of said driving means, said retarding force applying means being capable of exerting a greater torque on said rotor than said detent means, and a loose coupling between said first shaft and said second shaft to allow said detent means to accelerate the first shaft toward said reselected angular position, while said second shaft is being retarded.

8. In combination, a first shaft mounted for rotation, a second shaft loosely coupled to said first shaft for driving said first shaft in one direction toward a preselected angular position of said first shaft, and permitting angular position to resist the angular momentum of the driving means for said second shaft 9. Indexing mechanism for selectively positioning a rotor with respect to a plurality of surrounding stations, comprising a rotatable drive member, means for actuating amount of relative rotation between said drive member and said rotor and for thereafter affording a direct positive drive therebetween, means for applying a retarding force to said rotatable drive member, means for thereaffording sulficient and said a said first in the to apply a retardin general angular area of anism for moving a rotor from a preselected new position comng member for driving initial rest position and ry member, a retarding g force to said members said new position,

and

12. An actuating mechanism for moving a rotor from an initial rest position to a References Cited in the file of this patent UNITED STATES PATENTS Lundell July 9, Lacke Nov. 12, Murphy et al Oct. 27, Scheer Mar. 2, Linde Mar. 17, Dutfing et al. Jan. 19, Newell June 29, Hoza June 30, Martin et al. Ian. 11, MacSorley Nov. 25, Klein May 30, Bednack et al. Nov. 7, Pyle Dec. 12, Charles June 12, Kreiner Nov. 27, Curran Apr. 1, Schweighofer et al. July 29,

FOREIGN PATENTS Germany May 15,

preselected new position member for driving said

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