US2203300A - Printing telegraph apparatus - Google Patents

Description

June 4, 1940.

PRINTING TELEGRAPH APPARATUS Filed Dec. 17, 1936 2 Sheets-Sheet 1 INVENTO'R EDWIN W. F. HANKE ATToR Y E. w. F. HANKE 2,203,300

June 4, 1940. E. w. F. HANKE PRINTING TELEGRAPH APPARATUS Filed Dec. 17, 1936 2 Sheets-Sheet 2 INVENTORI EDWIN w. F. HANKE FIG. 9

ATTOR Y Patented June 4, 1940 PATENT- OFFICE PRINTING TELEGRAPH APPARATUS Edwin W. F. Hanke, Chicago, 111., assignor t Teletype Corporation, Chicago, 111., a corporation of Delaware Application December 17, 1936, SerialNo. 116,271

16 Claims.

This invention relates to printing telegraph apparatus, and particularly to selector mechanisms therefor. 7

An object of the invention is to increase the number of selective possibilities in a selector without increasing the time required for the performance of selections.

Another object .of the invention is to provide compound adjustment of a pivotally mounted element of a selector mechanism.

The invention features various styles of detents for an element of a selector which is shiftable into either of two selective positions, and which may bounce considerably before settling into the selective positions.

It is well known that in the use of permutation code combinations-of impulses for signalling, each additional impulse in the combination doubles the selective possibilities. Thus a five-unit code affords thirtytwo usable selective combinations, and a six-unit code affords sixty-four usable selective combinations. In selector mechanisms such as those shown in Patent No. 1,745,633 granted February 4, 1930 to S. Morton et al., in Patent No. 1,917,308 granted July 11, 1933 to H. L. Krum, and in Patent No. 1,937,376 granted November 28, 1933 to W. J. Zenner, the selective possibilities may be increased by adding one complete set of those elements, including cam projections, selector sword levers, T1evers, etc., under the control of which notched permutation code bars are set. Thus a five-unit selector may be converted into a six-unit selector, a six-unit selector may be converted into a seven-unit selector, etc. i

It should be remembered, however, that a selector mechanism thus converted requires an additional impulse in the signal combination to control the operation of the additional selector elements. If, in adding a code impulse to increase the selective possibilities, the same' speed of operation in cycles or code combinations per unit of time is to be maintained, in order that the transmission of characters shall not be slower, and in order that special driving mechanisms need not be employed, the code impulses must be proportionally shortened, and the operation of each chain of elements controlling a code bar must be accelerated.

The present invention relates primarily to those features by means of which the selective possibilities of a selector mechanism are increased, while maintaining a given standard of operating efiiciency, including the modification oi the sword operating levers in a sword and T-lever selector and thediminution of bounce in the selector lever by means of detents. The invention also contemplates a compound adjustment of the pivotal mounting of the selector lever.

For a full and complete description of the invention, reference may be had to the following detailed description, taken in connection wit the accompanying drawings in which Fig. 1 is a top plan view of one form of selector mechanism having applied thereto one form of selector lever detent;

Fig. 2 is a vertical sectional view taken approximately on the line 2-2 of Fig. 1;

Fig. '3 is a view partly in section showing a sword lever operating bell crank in relation to its associated cam projection;

Fig. 4 is a plan view having a portion broken away and showing another form. of selector mechanism which includes selector lever pivot adjusting means and another form of detent;

Fig. 5 is a perspective view of a portion of the selector mechanism shown in Fig. 4.;

Fig. 6 is a vertical sectional view taken ap proximately on the line 6-6 of Fig. 4;

Fig. 7 is a detail view partly in section showing the mounting of the detent shown. in Figs. 4 and 5; 1

Fig. 8 is a fragmentary view showing still another form of detent; I

Fig. 9 is a detail View partly in section showing the mounting of the detent shown in Fig. 8; and

Fig. 10 is a fragmentary perspective view showing a modified selector lever bracket adjusting system.

Referring now to the drawings, in which identical reference characters designate corresponding parts throughout the several views, and particularly to Fig. 1, reference numeral I6 designates a mounting plate for the several elements constituting a selector mechanism intended, primarily, ;for printing telegraph apparatus. A bracket llsecured to plate it by means of bolts l8 supports laminated core [9 of selector magnet 2| which includes po-le face 22. Mounting plate 16 also supports bracket 23 which has a pivotal mounting 24 for selector lever 26 which has rigidly secured thereto selector magnet armature 21. Tension spring 28 has one end secured to armature 21 and the other end engaging tension adjusting screw 29, whereby armature 21 and selector lever 26 are biased to their extreme clockwise position, in which position armature 21'is in its retracted position corresponding to the deenergized condition of the selector magnet.

-At its outer or free end, selector lever 26 is provided with spaced depending arms 3| (Fig. 2) Depending arms 3| are arranged to control the setting of the thin, flat, selector levers contained in a sword and T-lever selector mechanism designated generally by the reference numeral 32. Selector mechanism 32 includes a plurality of separator plates 33 secured one above the other in spaced relation upon a plurality of studs 34 carried by mounting plate l6. Between each two of the separator plates 33 there is disposed a thin, flat, selector finger or sword lever 36 arranged to undergo pivotal and reciprocatory movement. At its left-hand end, as viewed in Fig. 1, each of the sword levers 36 is provided with a disc-like portion 31 which is retained in a correspondingly shaped aperture in a thin, flat, bell crank lever 38 pivotally mounted on pivot pin 39 and urged in clockwise direction by tension spring 4| connected to spring post 42. At its outer or righthand end, as viewed in Fig. 1, each sword lever 36 is pointed and abuts one of a plurality of T- levers 43 pivotally mounted on pivot pin 44 and having outwardly extending arms 46 terminating in disc-like portions through which T-levers 423 are adapted to be articulated to code discs or code bars not shown. Adjacent to its disc-like portion 37 each of the sword levers 36 is provided with oppositely extending arms 98 which termihate in abutments 49. The abutments 49 are spaced apart a distance slightly greater than the distance between the depending arms 3| of selector lever 26 so that when lever 26 is in its extreme clockwise position, which it occupies when selector magnet 2| is deenergized, one of its arms 3| is in alignment with one set of abutments 49 of sword levers 36, and when the selector lever 26 is in its extreme counterclockwise position, its other depending arm 3| is in alignment with the other set of abutments 49.

As shown in Fig. 2, a power-driven shaft extends through an aperture in mounting plate i6 and has secured thereto spaced discs 52 and 53. Above and below discs 52 and 53 respectively are friction discs 54 of resilient material which frictionally engage end discs 56 rigidly secured to a selector cam assembly 51. Cam assembly 5'! includes cam projections 58 equal in number to the number of impulses of a code combination on which the selector mechanism is adapted to be operated, and, therefore, equal in number to the T-levers 43. The cam projections 58 are arranged helically around the cam. assembly 51 and each cam projection is aligned with one of the bell crank levers 38. Cam assembly 51 includes a cam 59 with which there is aligned the follower portion 6| of a selector lever locking bell crank 62 which is pivotally mounted upon pivot pin 39 and is urged in counterclockwise direction to bring its follower portion 6| into engagement with cam 59 by tension spring 63. Looking bell crank 62 terminates in a locking projection 65 which occupies blocking position with respect to an abutment 64 of a selector lever 26 when follower portion 6| rests against one of the nadir portions of cam 59.

Cam assembly 5'! includes a stop arm 66 which has at its outer end upstanding arm 61. Above cam assembly 61 there is fixedly mounted on posts 66, carried by mounting plate I6, a plate (I which carries pivotally mounted thereon coaxially with the shaft 5| a plate 12 on which is pivotally mounted a stop gate 13 which has a portion disposed in the path of upstanding arm 6! of cam assembly stop arm. 66. A stop gate latching lever M has a shoulder portion capable of locking stop gate I3 in position to arrest stop arm 66, and a compression spring 16 urges 'lever '14 into engagement with stop gate 13. A bell crank lever Tl pivotally mounted on bracket 18 carried by the rigidly mounted plate 1| has one arm in operative engagement with looking lever 14 at a point coaxial with the pivotal mounting of plate 12 and with shaft 5|. The other arm of bell crank 11 is aligned with a plunger pin 19 with which there cooperates an abutment screw 8| carried by arm. 82 rigidly connected to selector lever 25 and armature 21. The shank of screw 8| is eccentric with respect to the head thereof so that operative relationship between arm 82 rigid with selector lever 26 and plunger pin 19 may be adjusted as desired.

Plate 12 is mounted below plate 1| as indicated in Fig. 2. There is an arm 83 pivoted on plate 1| above said plate and coaxially with pivoted plate '12, and knurled locking screw 84 passes through arm 83 and threadedly engages plate 72, whereby the latter plate may be clamped in any desired position with respect to fixed plate H.

Referring again to Fig. 1, it will be noted that selector lever 26 carries an upstanding abutment pin 86 which in the particular embodiment is cylindrical. An arm 8'! pivotally mounted at 88 to bracket 89 has at its outer end a disc-like portion 9| which is held in engagement with abutment pin 86 by tension spring '92'which has one end engaging arm 81 and the other end engaging bracket 69. Pivotally mounted arm 81 serves as a detent to reduce bounce in the operation of selector lever 26 as will be described hereinafter. In operation, shaft 6| is continuously rotated and a continuous torque is applied to cam assembly 51 through friction discs 54. The selec tor magnet 2| is connected with a telegraph line and in a start-stop system of operation the line has current flowing therein when the circuit is idle but conditioned for the transmission of a message, whereby selector magnet 2| is energized and armature 21 is attracted to pole face 22 as indicated in Fig. 1. With the armature at tracted, selector lever 26 is in its extreme counterclockwise position and plunger pin 79 is in its retracted position, whereby the shoulder of lever 14 is permitted to engage the stop gate 13, which, in turn, restrains the cam assembly 5! from rotating. The first impulse of any code combination which is applied to the telegraph line is the start impulse, which is usually represented by a no-current condition on the telegraph line. The start pulse thus results in the deenergiza tion of selector magnet 2| and permits armature 21 to be retracted by spring 28, whereby selector lever 26 is shifted to its extreme clockwise position, causing plunger 19 to be depressed. Bell crank lever 71 is thus rocked counterclockwise (as viewed in Fig. 2), and lever I6 is rocked clockwise to lift its shoulder out of engagement with stop gate 13. The stop gate thus being permitted to rock, cam assembly 5'! responds to the torque applied by shaft 5| and escapes by rocking stop gate 13.

As cam assembly 51 rotates, cam 59 withdraws locking bell crank 62 from looking engagement with abutment 64 in timed relation to the signal impulses applied to selector magnet 2|, whereby armature 21 is permitted to respond to conditions of energization and deenergization of magnet 2| and selector lever 26 is shifted into its clockwise or counterclockwise position in accordance with the signal impulses. Cam projections 58 rock the-sword lever bell cranks 38 counterclockwise successively and in timed relation to the signal impulses so that sword levers 36 are drawn leftwardly (as viewedin Fig. 1). As each sword lever is thus moved leftwardly, one or the other of its abutments 49 is brought into engagement with one or the other of arms 3| of selector lever 26, and those sword levers which encounter one of the arms 3i before they reach the limitof their leftward travel are rocked clockwise or counterclockwise, depending upon the position in which selector lever 26 is presented. Thus, the sword levers are set in permutative arrangement in accordance with signal impulses applied to the selector magnet, and since each sword lever controls one of the T-levers 43, and may encounter the T-lever on either side of its pivot 44, the T-levers are set in permutative arrangement corresponding to the sword levers 36 and in turn position the code discs or code bars to which they are articulated.

The final impulse in a signal combination is a stop pulse, which is ordinarily represented by current on the telegraph line and so results in energization of selector magnet 2| and attraction of its armature 22. Plunger pin 19 is thus permitted to move to its retracted position and lever 14 is presented in looking engagement with stop gate 13, these conditions being effected by compression spring 15. Stop gate '13 thus being locked arrests stop arm 66 and cam assembly 5! at the conclusion of one revolution and the selector magnet is thus conditioned for reception of the next code signal combination. In such stop condition, the locking bell crank lever 62 engages a high portion of cam 59 and is thus held out of blocking engagement with abutment 64 so that selector lever 26 is capable of responding to a start pulse applied to the selector magnet.

As previously set forth, it is desirable not to reduce the operating speed of a selector mechanism and associated printing telegraph apparatus when such selector mechanism is converted to increase the selective possibilities, as from fiveunit to six-unit code operation. It is desirable to maintain standard operating speed in order that the efiiciency of thetelegraph line shall not be diminished and also in order that standard driving mechanism may be employed. Thus, it will be desirable to operate shaft 5| at the same velocity regardless of whether the selector mechanism is to position live or six code bars or discs, but if a five-unit code is employed, five sword levers will be set permutatively during one revolution of cam assembly 51, whereas, if a six-unit code is employed, six sword levers36 will need to be conditioned permutatively in the same time interval. Under such circumstances, the interval of time in which the selector lever 26 may be set and the bell crank lever 38 rocked counterclockwise to draw sword lever 36 leftwardly, will be shorter in six-unit code operation than in fiveunit. code operation; One of the methods by which the time interval for one sword lever operating cycle may be reduced is to accelerate the the point at which cam projection 58 engages lever 38 and that as the curvature of lever: 38 at the point of engagement is altered and made more concave, as indicated in dotted lines in Fig. 3, cam projection 58 willengage lever 38 later thanit would with the curve as indicated in solid lines and will be in engagement with lever 38 for a shorter period of time so that bell crank 38 will be moved to its counterclockwise position more rapidly and therefore the setting of the associated sword lever will be consummated in a shorter period of time.

. It is essential that the selector lever 26 be brought substantially into rest position and locked in that position by the locking bell crank lever 62 before an abutment 49 of one of the sword levers 35 is brought into engagement with one of the arms 3| of selector lever 26 by operation of the associated bell crank lever 38. Accordingly, it has been found desirable to bring about some of the reduction in the operating cycle of a sword lever in the setting of the selector lever 26 rather than to attempt to accomplish all of such reduction in the operation of the sword lever operating bell crank 38.

The response of armature 21 to energized condition of selector magnet 2| is relatively violent and thus selector lever 26 may vibrate or bounce before coming to rest in its extreme counterclockwise position. Similarly, spring 28 is relatively violent in the rocking of selector lever 26 clockwise and the lever tends to vibrate before coming to rest in its extreme clockwise position. Locking bell crank 62 cannot be brought into blocking relation with abutment 64 until the vibration of selector lever 26 has been reduced to very small amplitude and a sword lever 36 cannot be moved leftwardly until selector lever 26 has been locked. More immediate locking of the selector lever in each sword lever operating cycle is thus dependent upon reduction ofbounce of the selector'lever and this may be accomplished by means of the previously described detent lever 8! cooperating with upstanding abutment pin 86. As selector lever 26-passes from one of its extreme positions to the other, abutment pin 86 moves across the surface of disc-like portion 9| and rocks detent lever 81 clockwise against the tension of spring 92. When detent lever 81 reaches its extreme clockwiseposition, abutment pin 86 passes over the outermost portion of disc 9| and engages a descending arc, whereupon spring 92 adds its eiiect to the force which is moving selector lever 26 to bring that lever into rest position, and little or no bounce occurs due to the detent action of lever arm '81. With this arrangement the selector lever 28 may be blocked by locking bell crank 62 much earlier in a sword lever operating cycle than is possible without the detent lever.

The cylindrical abutment pin 86 and cooperating disc-like portion Sil of detent arm 81 were found to be particularly effective in the type of selector mechanism shown in Figs. 1 and 2. The cooperating surfaces of the two elements have constantly changing slopes and the change is such that the force required to be exerted by the selector lever to rotate the detent lever 81 against the tension of spring 32 is a maximum as selector lever 28 begins to move and decreases until it comes'to zero when the detent has been brought to its extreme clockwise position. Thereafter detent 8T exerts a continuously increasing force upon a selector lever to bring it to rest in the selective position.

The anti-bounce detent, disclosed in Figs. 1 and 2, is a permissive detent in that it does not positively stop selector lever 26 in either of its extreme positions. Selector magnet 2| exerts a force upon armature 2i tending to move the armature into engagement with pole face 22, and

if any positive stop is employed near the free end of selector lever 25, that lever may become twisted or otherwise deformed, or even broken due to the arrestment of the selector lever before armature 21 has come to rest. Accordingly, it is desirable to apply any limiting stops which may be employed to armature 21 and provide no positive stops to selector lever 26. Looking bell crank 62 is not to be considered as a positive stop because it does not come into blocking relation with selector lever 26 until after that lever has been brought substantially to rest.

Referring now to Figs. 4 and 5, there is shown a modified form of selector mechanism similar to that shown in the hereinbefore mentioned Zenner patent in which the selector lever is controlled in accordance with the attraction or nonattraction of the selector magnet armature with out being connected directly to the armature. In Figs. 4 and 5, reference numeral IOI designates a mounting plate upon which is pivotally mounted bracket I02 which supports core member I03 of selector magnet I04. Bracket I02 is pivotally mounted on plate IOI by means of pivot screw I05 and its alignment with respect to plate I III is adjustable by rotation of screw I 06, which, having spaced head and flange between which stud I01 carried by plate I M is disposed, is incapable of axial movement and therefore imparts movement to bracket I02 which it threadedly engages. Clamping screws I00 extend through arcuate slots in bracket I02 and threadedly engage mounting plate I0 I, whereby bracket I02 may be rigidly clamped in desired position to mounting plate IN.

A bell crank lever, which comprises arms III and H2, and which is commonly identified as an armature lever, is pivotally supported by screw I05 and by coaxially mounted pivot screw H3 carried by bracket I02. Armature H4 of selector magnet I04 is rigidly secured to arm II?! of the armature lever. The free end of lever arm I II terminates in a cam follower portion H6 which is adapted to engage an armature cam (not shown).

Mounting plate IOI supports a sword lever and T-lever assembly I I 8 similar to assembly 32 of Fig. 1, and similarly including sword levers II 9 and T-levers I 2|. The sword levers H0 are provided with abutments I22 for cooperation with spaced depending arms I23 of a selector lever I24. Selector lever I24 is pivotally mounted by means of pivot screws I26 on a bracket I21, which is adjustably secured to mounting plate MI in a manner which will be described hereinafter. Selector lever I24 has connected to it one end of a tension spring I28, the other end of which is connected to extension I29 of arm III of the armature lever. An abutment screw I3I also carried by extension I29 has its head in engagement with selector lever I24 to maintain spring I28 under tension and to serve as a positive drive between the armature lever and the selector lever in one direction. A locking lug I32 carried by selector lever I24 at the free end thereof cooperates with a locking blade I33 of locking bell crank lever I34 pivotally mounted on the pivot pin I36 to lock the selector lever in either of its two selective positions. Locking bell crank lever I34 is actuated to unlock and relock selector lever I24 in timed relation to signals applied to selector magnet I04 similarly to previously described locking bell crank 62, by a cam similar to cam 50. A plate I31 similar to plate 1| carries a stop gate (not shown) for the arrestment of a selector cam assembly (not shown) and the stop gate mechanism includes a plunger pin I38 similar to plunger pin 19- which is controlled by an abutment screw I30 carried by extension I29 of flutter lever arm III. Clamping arm MI and clamp ing screw I42 are provided for clamping the stop gate in any desired position of adjustability with respect to plate I31.

The previously described bracket I21, which pivotally mounts selector lever I24, is provided with clearance holes I46 through which extend clamping screws I41 threadedly engaging mounting plate WI, and by means of which bracket I21 may be clamped in desired position. Inter.- mediate the clearance holes I41, bracket I21 is provided with elongated slot I48 in which is diswhich has its center on the axis of adjusting screw head I5I, by rotating adjusting screw head I49 in slot I48. The eifect of this adjustment is to vary the distance between depending arms I23 of the selector lever and abutments I22 of sword levers II9. The pivotal mounting of lever I24 may be adjusted in a transverse direction by rotating screw head I5I which causes mounting bracket I21 to shift longitudinally while being guided by adjusting screw head I49 within slot I48.

An anti-bounce detent lever I56 is adjustably mounted upon eccentric bushing I51 (Fig. '7) carried by post I58 which is supported by mounting plate II. A clamping screw I59 olamps bushing I51 in any desired position of adjustment while permitting detent lever I56 to rotate thereon. Detent lever arm I56 is provided'near its free end with an open aperture I6I, at the base of which is a crown or ridge I62 from which oppositely sloping surfaces extend and intersect the sides. An abutment pin I63 is mounted on the selector lever I24 and is disposed within the aperture I6I in detent lever I 56. A tension spring I64 biases detent arm I 56 in clockwise direction to bring the base of its aperture into engagement with abutment pin I63.

'It will be noted that in the selector mechanism shown in Fig. 4, the armature lever may be rotated into its extreme counterclockwise position so that armature II4 engages the pole face of selector magnet I04 without selector lever I24 being simultaneously correspondingly positioned, and that the selector lever will become correspondingly positioned when permitted to move by withdrawal of locking blade I33 from blocking alignment with locking lug I32. It will also be observed that when selector lever I24 is in its extreme counterclockwise position and the armature lever attempts to rotate to its extreme clockwise position, it will be prevented from rotating due to engagement of abutment screw I3I with selector lever I 24, until locking blade I33 unlocks the selector lever.

The first impulse of a. signal combination is, as previously described, a start impulse, which results in deenergization of selector magnet I04,

whereupon armature I I4, being no longer held,

may be'drawn away from the pole face bythe armature lever which rotates to its extreme clockwise position. Plunger pin I38 is thus depressed to release the stop gate (not shown) to permit rotation of the selector cam assembly (not shown). As the selector cam assembly rotates, it cyclically rotates. the armature lever to bring armature l M into engagement with its pole face, it cyclically unlocks selector lever I24 and it successively actuates the several sword lever operating bell cranks. When the armature H4 is held by magnet I04, after being rocked into engagement with its pole face, abutment screw I3I is drawn away from selector lever I24, and when looking bell crank I34 unlocks the selector lever, it rotates into its extreme counterclockwise position. When the selector magnet I84 is deenergized, armature H4 is not held and the armature lever returns, or tends to return to its extreme clockwise position, where-upon the selector lever, if then in its extreme counterclockwise position, moves to its extreme clockwise position when unlocked by the locking lever I34. In this manner the selector lever is positioned selectively and sword levers I I9 and T-levers I2 I, are positioned permutatively in accordance with signal impulses applied to selector magnet I84. Since the selector lever is not directly connected to the selector magnet armature II4, it may lag behind the armature in its operation, under the control of the lock lever I34. The interconnection between armature H4 and selector lever I24 being non-rigid, as distinguished from the structure shown in Fig. l, the detent arm IBI may include positive stops since there is no possibility of injury to the selector lever as a result of violent operation of the armature lever or selector magnet armature. Accordingly, the aperture in the detent lever I56, in which abutment pin I63 is disposed, affords the positive. stops comprising its opposite sides, and also affords the camming surfaces comprising the oppositely sloping surfaces intersecting in the central ridge I62. When the selector lever I24 shifts from one to another of its rest positions, the abutment pin I63 cams detent arm I56 to rotate in clockwise direction in opposition .to tension spring I64 until'ridge I62 is passed, whereupon spring I84 assists in bringing the selector lever into its rest position, and any tendency of the selector lever to bounce is quickly eliminated.

In Figs. 8 and 9, there is shown another form of detent which may be employed for reducing bounce in selector levers of the type shown in Fig. 4, which are not rigidly connected to the selector magnet armature. This detent is designated by the reference numeral HI, and may be. mounted on the eccentric bushing I51 supported by post I58, as shown in Fig. 9. Clamping screw I59 maintains bushing I51 in the desired fixed position with respect to post I58 after it has been adjusted. Detent lever I1I is provided with a closed aperture of arcuate shape which is entered by detent pin I13 carried by selector lever I24. A tension spring I14 urges detent I1I in counterclockwise direction, whereby detent pin I13 is vcammed into abutment with one or the other of the ends of arcuate aperture I12.

In operation, detent 'arm H1 is rotated clockwise as selector lever I24 shifts fromone of its positions to the other and the tension in spring I14 is increased during such rotation.

it adds to the restoring effect of spring I14 an As pin' I13 passes the midpoint of arcuate aperture I12,

additional driving force by engaging the righthand wall of aperture I12, as viewed in Fig. 8, and thus positively drives detent arm I1I into such position that pin I13 may come to rest at the end of the arcuate aperture. Any substantial tendency of selector lever I24 tobounce is resisted by the left-hand cam surface of the armate aperture I12 in detent arm I1I.

It will be noted that detent I'lI embodies positive stops for selector lever I24 as in the case of detent I58 shown in Figs. i, 5, and 1. Detent I1I has the additional characteristic of aiding its restoration spring in returning it to normal position, which characteristic detent I56 does not possess due to the fact that the aperture therein is open at one side.

Detent I1I is shown as positioned below selector lever I24 with pin I13 extending downwardly from the selector lever. It will be understood that this detent is capable of being mounted above the selector lever to cooperate withv a detent pin upstanding therefrom, and that detent I56 could, with equal facility, be positioned below the selector lever, if desired.

In Fig. there is shown a modified arrangement for adjusting the bracket which pivotally supports the selector lever in a selector mechanism of the type shown in Fig. 4. The principal difference between the adjusting arrangements is that in the structure shown in Fig. 10, the means by which the selector lever is shifted longitudinally is not a permanent part of the selector mechanism. It will be noted, in Fig. 10, that the mounting plate IllI supports a selector lever bracket I8I which has clearance holes :82 through which extend the shanks I83 of clamping screws similar to clamping screws I41 of Figs. 4: and 6 and similarthreadedly engaging mounting plate IIlI. Bracket ISI is pivotally mounted on the cylindrical head of screw I84 which may be an eccentric adjusting screw similar to screw I5I (Figs. 4, 5, and 6) On opposite sides of bracket I8I, mounting plate IflI is provided with cylindrical apertures I86. For adjusting bracket I8I angularly about mounting screw I84, there is provided a tool, the shank I81 of which is provided with an eccentric projection I88 of lesser diameter than shank I81 and dimensioned to enter freely either of the apertures I86 in mounting plate IIII. Eccentric projection I88 is adapted toenter one of the apertures I86, after which shank I81 may be rotated. I Projection I88 will then define the center of rotation, and shank I81 constitutes an eccentric which, coming into engagement with bracket I8I, and the rotation being continued, will shift bracket I8I angularly about the head of screw I84. The direction of movement of bracket I8I is determined by the particular one of apertures I86 into which the eccentric tool is fitted. With this arrangement, the positioning of bracket I8I may be accurately controlled, after which the bracket may be positively retained in the desired position by means of theclamping screws which extend through the clearance apertures I83.

Although specific embodiments of the invention have been shown herein, it will be understood that the invention is capable of modification, rearrangement, and substitution within the scope of the appended claims.

vWhat is claimed is:

1. In a selector mechanism, signalresponsive means, a selector element presentable in either of twoYpositions under control of said means,

means for operatively supporting'said selector element, means for imparting movement of one character to said supporting means, and means for imparting movement of another character to said supporting means.

2. In a selector mechanism, signal responsive means, a selector element presentable in either of two positions under control of said means, means for operatively supporting said selector element, means for imparting compound movement to said supporting means, and means for clamping said supporting means to resist such movement.

3. In a selector mechanism, signal responsive means, a selector element movable to either of two selective positions under control of said means, means for pivotally supporting said selector element having a circular aperture and an elongated aperture therein, and means comprising eccentrics disposed within said apertures for imparting compound movement to said supporting means,

4. In a selector mechanism, signal responsive means, a selector element presentable in either of two selective positions under control of said means, means for pivotally supporting said selector element having a circular aperture and an elongated aperture therein, and eccentric means disposed within said apertures for shifting the pivotal axis of said selector element longitudinally and transversely of said element.

5. In a selector mechanism, signal responsive means, a selector element presentable in either of two selective positions under'control of said means, a bracket having pivotal means for supporting said-element, said bracket'having a circular aperture and an oblong aperture therein, a rotational member having an eccentric portion disposed within said circular aperture in substantially close-fitting relation therewith, and a rotational member having an eccentric portion disposed within said oblong aperture in substantially close-fitting relation with the sides thereof only.

6. In a selector mechanism, signal responsive means, a selector element presentable in either of two selective positions under control of said means, a bracket having at one end thereof means for pivotally supporting said element, said bracket havin a circular aperture at the other end thereof and an elongated aperture intermediate the ends, a rotational member having an eccentric portion disposed within said circular aperture in substantially close-fitting relation therewith, and a rotational member having an eccentric portion disposed within said elongated aperture in substantially close-fitting relation with the sides thereof only.

7 In a selector mechanism, a mounting plate, signal responsive means carried by said mounting plate, a bracket having clearance apertures carried by said mounting plate, clamping means extending through said clearance apertures and threadedly engaging said mounting plate, a selector element pivotally supported by said bracket and presented in either of two selective positions under control of said signal responsive means, said bracket having a circular aperture and an elongated aperture therein, a member rotationally supported by said mounting plate and having a cylindrical eccentric portion disposed within said circular aperture in close-fitting engagement therewith, and another member rotationally supported by said mounting plate and having a cylindrical portion disposed within said elongated aperture in close-fitting engagement:

with the sides thereof only. I

8. In a, selector mechanism, a selector element presented in either of two selective positions, signal responsive means for controlling the presen-:

tation of said selector element in said positions, and means for overcoming reactive forces op-' posing the presentation of said element in said sement at rest condition in said selective positions.

10. In a selector mechanism, a selector element pivotally mounted for presentation in either of two selective positions, signal controlled means for effecting the presentation of said element in said positions, a cylindrical abutment pin carried by said selector element, and a pivotally mounted spring biased detent arm having a disc-like portion maintained in surface engagement with said abutment pin.

11. In a selector mechanism, a selector element pivotally mounted for presentation in either of two selective positions, signal controlled means for effecting the presentation of said element in said positions, an abutment pin carried by said selector element, a pivotally mounted spring biased detent having an open aperture in which said abutment pin is disposed, said aperture having substantially parallel sides forming positive stops for said selector element, and oppositely sloping cam surfaces at the base thereof for resisting reactive forces postponing the arrival of said selector element at rest condition in either of said positions.

12. In a selector mechanism, a selector element pivotally mounted for presentation in either of two selective positions, signal controlled means for effecting the selective presentation of said element in said positions, an abutment pin carried by said selector element, a pivotally mounted and spring biased detent arm having an enclosed aperture in which said abutment pin is disposed, said aperture affording positive stops for said selector element, said aperture also afiording an arcuate surface with which said abutment pin cooperates to expedite restoration of said detent arm to normal position, and said aperture also affording oppositely sloping cam surfaces with which said abutment pin cooperates to oppose the active forces tending to postpone the arrival of said selector element at rest condition in said selective positions.

13. In a selector mechanism, a selector element pivotally mounted for presentation in either of two selective positions, signal controlledmeans for effecting the presentation of said element in said selective positions, an abutment pin carried by said selector element, a pivotally mounted detent arm having an aperture in which said abutment pin is disposed, meansfor shifting the pivotal axis of said detent arm, and means for clamping said shifting means in any efiective position thereof.

14. In a selector mechanism, a mounting plate, a bracket adjustably supported by said plate, a selector element pivotally supported by said bracket and adapted to be presented in either of two selective positions, signal controlled means supported by said plate for efiecting the presentation of said element in said selective positions, a locking lug carried by said selector element at a point spaced from the pivotal mounting thereof, a pivotally mounted lock lever cooperating with said lug to block said selector element in either of its selective positions, a pivotally mounted detent arm cooperating with said selector element and afiording positive stops therefor, and

means for adjusting the pivotal mounting of said detent arm in accordance with the adjustment of said bracket.

15. In a selector mechanism, signal responsive means, a selector element presented in either of two selective positions under control of said signal responsive means, means for pivotally supporting. said selector element, means for pivotally supporting said supporting means, and eccentric means for controlling the pivotal position of the last mentioned means.

16. In cooperation with a selector mechanism including a foundation member having a circular aperture therein and adjust-ably mounted thereon an element pivotally supporting selector means, a manually operable tool for adjusting said element including a cylindrical portion dimensioned to enter said aperture and be rotationally guided thereby, and another cylindrical portion eccentric to the first mentioned cylindrical portion adapted to engage and effect adjustment of said selector means supporting element.

EDWIN W. F. HANKE.

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