US2323373A - Registering mechanism and computing device - Google Patents

Description

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REGISTERING MECHANISM AND commune DEVICE Filed Nov. 24, 1939 15 Sheets-Sheet 15 QMQ mg Qwx w Es m mg 3% mg s Q3 variating mechanism for a Patented July 6', 1943 REGISTERING MECHANISM AND COMPUTING DEVICE Kenly 0. B ll, Fort Wayne, Ind. Application November 24, 1939, Serial No. 305,758

44 Claims.

This invention pertains to variating or integrating mechanism, and more particularly to a speed variator for computing the price, characteristic of a computing head.

It is an object of this invention to provide computing head wherein the driving gears are constantly in mesh and rotate each shaft cause the selected shaft to operate.

Another object is to provide a variating mechanism wherein the gearing is disposed so that a majority of the gearing is adapted to give an effective one-to-one ratio, 1. e., drive at the same speed. 7

Still anotheroblect of'the invention is to provide warmer wherein the effective price selec- Icoupling the selected gears to jve" shafts by a vertical coupling, not

sold gears, and thereby elimihating-the necessity of using gears with thick faces.

Yet another object is to provide a variator wherein all undue wear on the gear faces is eliminated as all the gears rotate, except for zero selection, the gears other than the selected gear operating as idlers.

A different object is to provide a variator wherein the inertia is greatly reduced as it is limited to the selected tier of gears, and a device is attained which runs evenly.

Another different object is to provide a variator wherein selector rings are provided for setting the device, the rings being so constructed and arranged that a ring can only make one selection at a time, yet select-ion may be easily accomplished as it is done only by a rotative movement, the movement and relation of the parts being such that gears do not have to be felt for, as where the faces of gears must be meshed.

Still a different object of the invention is to provide a variator wherein the casing at least partly comprises the operative selector members or rings.

Yet a different object is to provide a variator having selector mechanism for the various price steps which are of the same size and fashioned so that simplified daily'price means (or price synchronizing means) may be used.

Still another different object is to providea variator wherein the position of the price driving members can be had at a plurality of points, and

also the gallons or amount take-off may be from a plurality of points.

Yet another different object is to provide a variator wherein the gear are arranged in tiers,

within the mechanism to making it possible to place the shafting in a circle common to all tiers, thereby permitting certain shafts to be carried through all tiers. and allowing operative engagement of the selecting rings with the clutch members of the gears, and also a convenient arrangement of the differential.

Another object is to provide a variator having selecting rings for ready selection of the price at which the device is to be set, which rings, gear and shaft connecting mechanism eliminate additional elements, such as springs, to disengage the gear and shaft connections as the disconnection and connection is" accomplished positively.

Another object is to provide variator mechanism having connecting mechanism which is self-retaining, is operative to urge the gear and shaft connecting mechanism into operative position, and positively retains such mechanism in operative position after full connection.

Another object is to provide a variator mechanism having setting means forming, in effect, part of the housing whereby the computing means is effectively housed so that the gearing is protected and it is impossible to tamper with any mechanism'to cheat the visible set price.

Another object is to provide variating means which will only compute at the figures at which it is set.

Another object is to provide variator mechanism having the operating shafts circularly arranged about a centrally disposed differential permitting the use of circular selecting means, this being made possible by carrying certain shafts through the tiers of the mechanism, and providing gearing in such a way as to properly compound certain of the gearing,

Another object is to provide a variator so constructed and arranged that stamped gears can be readily used, permitting the use of gears made inexpensively and lightly, this being made possible by continuous meshing'of the gearing; be-

cause where gears must be moved into engagement with other gears for selective operation,

they must have wide faces to prevent mutilation of the teeth while being engaged and to insure engagement, and such agear must be made by a relatively expensive process as it cannot be stamped relatively cheaply.

Another object is to provide a variator wherein the arrangement is such as to reduce the number of bearings to a minimum.

Another object is to provide a variator which is small, compact, strong, and so constructed and arranged as to be easily and readily assembled,

thereby permitting the use of simple and inexpensive tools and fixtures necessary for assembly.

Another object is to provide a variator so constructed and arranged that an oil reservoir is provided for lubrication of the entire device.

Another object is to provide a variator having retaining means for the entiredevice.

Another object is to provide a variator mechanism wherein the setting means includes rotatable selecting members which are maintained in rotative position by means of the mechanism operated thereby.

Another object is to provide variating means having a plurality of ranges, each being adapted to be set by movable means, as pushbuttons,.located in one plane.

Another object is to provide variating means which can be set only in accordance with the visible indications on the variating setting indicator or price synchronizing means.

Another object is to provide variating means for the computing head of a liquid dispensing apparatus which fulfills all the herein recited and apparent objects.

With these and various other objects in view, the invention may consist of certain novel features of construction and operation as will be more fully described and particularly pointed out in the specification, drawings and claims appended hereto.

In the drawings, which illustrate embodiments of the device, and wherein like reference characters are used to designate like parts- Figure 1 is an enlarged top plan view of the tens portion of one form of variator embodying the invention, the same being taken substantially in the plane as indicated by the line |-l of Figure 7, and showing the disposition of the parts where that portion of the variator is set for twenty cents;

Figure 2 is an enlarged fragmentary top plan view showing the locking mechanism for the selecting rings of the variator, said mechanism being in a position where other than the zero calibration is selected;

Figure 3 is an enlarged top plan view of the units portion of the variator, the same being taken substantially in, the plane as indicated by the line 3-3 of Figure 7, and showing the disposition of the parts when that portion of the variator i set for three cents;

Figure 4 is an enlarged fragmentary top plan view showing the locking mechanism in a position wherein a zero calibration is selected;

Figure 5 is an enlarged top plan view of the fractional portion of the variator, the same being taken substantially in the plane as indicated by the line I--! of Figure '7, and showing the disposition of the parts when that portion of the variator is set for three-tenths cents;

Figure 6 is an enlarged top plan view of the driving gears of the variating mechanism, the

same being taken substantially in the plane as indicated by the lines 5-4 of Figure 7;

Figure 7 is a vertical sectional elevation through the variating mechanism, the same being taken substantially in the plane as indicated by the lines l-l of Figures 1, 3, 5 and 6;

Figure 8 is a large developed sectional elevagkm through the driving gears shown in Figure Figure 9 is an enlarged sectional elevation taken substantially in the 9-! of Figure 1;

plane as indicated by the line Figure 10 is an enlarged sectional elevation 75 taken substantially in the plane as indicated by the line Ill-40 of Figure 1;

Figure 11 is a fragmentary bottom plan view of the setting rings of the variaton'showing the relation of the holding means to the clutch operating members for the computing gears;

Figure 12 is an enlarged sectional elevation showing the differential mechanism, the same being taken substantially in the plane as indicated by the line l2--l2 of Figures 1, 3 and 5;

Figure 13 is a sectional top plan view of the drive shaft and means for preventing rotation of said shaft in other than a predetermined position;

Figure 14 is a top plan view showing the assembly of the variator and the price synchronizing means;

Figure 15 is a side elevation of the variator and synchronizing means shown in Figure 14 with a side plate omitted at the right of said figure;

Figure 16 is an enlarged sectional elevation of the numeral wheels of the synchronizing means shown in Figures 14 and 15, the same being taken substantially in the plane as indicated by the line |8vii of Figure 14;

Figure 17 is an elevation of the tens selecting in Figure 18 is an elevation of the units selecting ring;

Figure 19 is an elevation of the fractions selectn rin Figure 20 is a bottom plan view of the tens selecting ring as illustrated in Figure 17 Figure 21 is a bottom plan view of the units selecting ring illustrated in Figure 18;

Figure 22 is a bottom plan view of the fractions selecting ring illustrated in Figure 19; V

Figure 23 is a developed elevation of the lower calibrated bearing flange of the tens selecting ring shown in Figure 17; i a

Figure 24 is a developed elevation of the lower calibrated bearing flange of the unitsselecting ring shown in Figure 18;

Figure 25 is a developed elevation of the lower calibrated bearing flange of the fractions selecting ring shown in Figure 19;

Figure 26 is a fragmentary side elevation of a" modified form of price synchronizing means wherein the indicating wheels are disposed in vertical planes;

Figure 27 is a top plan view of the mechanism illustrated in Figure 26;

Figure 28 is a more or less diagrammatic top plan view of another modified form of price synchronizing means adapted for use with the variating mechanism illustratedin Figures 1 to 25 inclusive;

Figure 29 is an elevation of the gear train or driving gears of a modified form of variating mechanism embodying the invention;

' Figure 30 is a fragmentary top plan view of i the gear train illustrated'in Figure 29, the same being taken substantially in the plane as indicated by the line 303ll of Figure 31; 1

Figure 31 is an elevation of a modified form of variating mechanism embodying the invention;

Figure 32 is an elevation of the manual setting mechanism of the variator;

Figure 33 is an enlarged sectional elevation through the differential mechanism of the variat Figure 34 is an enlarged fragmentary elevation showing the clutch engagement mechanism for the price selecting means;

Figure 35 is a top plan view of one form of daily taken substantially in the plane as indicated by the line 31-31 of Figure 31;

Figure 38 is an enlarged top plan view of the units price selecting mechanism, the same being taken substantially in the plane as indicated by the line 38-38 of Figure 31;

Figure 39 is an enlarged top plan view of the I tenths price selecting mechanism, the same being taken substantially in the plane 'as indicated by the line 39-48 of Figure 31.

Variating mechanisms-Figures 1 to 28 inclusive I Referring first of all more particularly to the form of variator illustrated in Figures 1 to 24 inclusive, said variator consists essentially of the spaced supporting plates 50, 52, 54 and 58, the space between the plates 50 and 52 being closed by the ring 58, thus forming a lubricant reservoir. The cover plate 80 is'provided to complete the housing, and the plates are suitably secured together by means of the spaced securing rods 82, the opposite sides of the cover plate 80 being cut away as indicated at 84 to permit setting of the device, as will more clearly hereinafter appear. Inasmuch as common securing means is used for the entire height of the device, suitable spacing bearing sleeves 8| are disposed between the tiers formed by the plates to form a rigid assembly and correctly space said tiers.

Driving gears In this form of the device the drive shatwili tends into the space between the gear 4 non-rotatably mounted thereon and meshing with the forty-two-tooth gear II8 nonrotatably mounted on the shaft 8. The'shaft H8 is provided with the forty-four-tooth gear I non-rotatably mounted thereon, said gear meshing with the forty-four tooth gear I22 nonrotatably mounted on the shaft I24. The shaft I24 is provided with a forty-eight-tooth gear I28 non-rotatably mounted thereon, and meshing with the forty-eight-tooth gear I28 non-rotatably mounted on the shaft I30. The shaft I30 is provided with a sixty-eight-tooth gear I32 nonrotatably mounted thereon, and meshing with the slxty-eight-tooth gear I34 non-rotatably mounted on the shaft I38. In order to conveniently mount the various gears on the shafts, the shafts are preferably made of substantially square section, the corners being cut off, however, so that where the gears are made rotatable the shafts can be received in the circular apertures pro'vided intfiegear for permitting the rotative mounting. While the shaft 88 has been shown as driving the shaft 12 through the gearing, it is of course appreciated that any of the shafts I8, 84, 02, I00.

I05, H2, H8, I24, I or I38 may be used as the drive shaft.

Fraction selecting mechanism ;.iecting ring is calibrated to be read in tenths, and

n, and is provided withthe cams a: (Figure 13) having cooperative engagement with the sliding pawl 85 for preventing reverse rotation of the drive shaft, said pawls being positioned by the straps 81 fastened to the plate 50, it being seen that the normal rotation of the drive shaft 08 is clockwise in top plan. The shaft 88 is provided with the twenty-tooth gear 88 which meshes with the forty-tooth gear 10 non-rotatably mounted on the shaft I2. The gear I8 meshes with the forty-tooth gear 14 non-rotatably mounted on the shaft 18. The shaft 12 is also provided with the forty-two-tooth gear 18 non-rotatably mounted thereon and meshing with the fortytwo-tocth gear 80 rotatably mounted on the shaft I 84, the gear 80 being provided with the thirtytwo-tooth gear 88 also rotatably mounted on the shaft 84, and rotating with the gear 80. The forty-eight-tooth gear 88 is non-rotatably mounted on the shaft 84 and meshes with the sixteentooth gear 80 mounted on the shaft 82. The shaft 82 is also provided with the thirty-two-tooth gear 84 meshing with the gear 88, and said shaft is provided with the twenty-eight-tooth gear 88 meshing with the twenty-eight-tooth gear 88 non-rotatably mounted on the shaft I00. The shaft I00 is provided with the thirty-two-tooth gear I02 non-rotatably mounted thereon, said gear meshing with the thirty-two-tooth gear I04 non-rotatably mounted on the shaft I 08. 'The shaft I08- is provided with the thirty-.six-tooth gear I08 non-rotatably mounted thereon, said gear meshing with the thirty-six-tooth gear IIO non-rotatably mounted on the shaft I I2.

The shaft H2 is provided with the forty-tooth one quarter and three-quarters of a cent, such as shown at the stations I48, the calibrations being indicated at said stations. Corresponding to said stations locking recesses or indentations I48 are provided.

It will also be noted that there is a locking passageway I58 through said ring I 40 corresponding to the zero station. Said stations at which the visible numerals are placed, as well as the recesses and the passageway, are provided in the, lower flange I52 of said ring, said flange also providing a bearing for the ring on the plate 52. The ring is provided with the inwardly extending clutch operating, or selecting, or carrying flange I54, said flange being interrupted at I58 and I58, downwardly projecting planes or track members I80 and I82 being disposed on each side of the interruption, said track members being s milar to the members 328 and 328 (Figures 9 and 10) The shafts '12, 18,84, 02, I00, I08, II2,'II8. I24, I30 and I38 extend upwardly through the plate 52 and within said ring, said shafts being provided. respectively, with the slidable coupling, or clutch members, or sleeves I84 non-rotatably mounted on said shafts, the coupling members be ng provided with the head I88 beveled as at I88, thehead being larger than the sleeves and 7 being adapted to be carried on the flange I54 tween the interrupted portions I58 and I58, that clutch sleeve is operative, all as more particularly hereinafter described.

The members I84 are provided with the depending fingers or crown I10 adapted to be received by the complementary crown or upstanding fingers I12 provided on the gears which are rotatably mounted on the respective shafts. In order to retain the selected clutch sleeve I64 in its lowermost or clutched position between the interrupted portions I68 and I68, the retaining lever or member I14 is provided, said member having bevelled sides I16, said lever being similar to the lever 380 (Figures 9 and 10), and having the fixed pivot post I18 extending through and Journalied in the flange I64 and being provided with the spaced pins I18 and I80 secured, respectively, to one end of the contractile springs I82 and I84, said springs being secured at the other ends thereof as at I88 and I88 (Figure 11) to the ring.

The shaft 16 is provided with the twenty-tooth gear I80 for the one-quarter cent (54) computation, rotatabiy mounted thereon and provided with the upstanding fingers or crown I12, said gear meshing with the sixty-tooth-gear I82 for the three-quarters cent (52) computation, rotatably mounted on the shaft 12. The gear I82 meshes with the twenty-four-tooth gear I 84 for the one-tenth cent (1s) computation, rotatably mounted on the shaft 84, the gear I84 meshing with the forty-tooth-gear I88 for the five-tenths cent (1%) computation, rotatably mounted on 30 said gear 264 meshing with the thirty-twotooth-gear 208 for the four-tenths cent (in!) computation, rotatably mounted on the shaft I24. The gear 208 meshes with the sixty-four-toothgear 208 for the eight-tenths cent (15) computation, rotatably mounted on the shaft I 80, and said gear 208 meshes with the seventy-two-toothgear 2l0 for the nine-tenths cent (in!) computation, rotatably provided on the shaft I26. As already pointed out, each of said gears is provided with the upstanding crowns I12 adapted to recelve the corresponding crowns on the respective clutch sleeves I84, non-rotatably mounted on the respective shafts.

Diflerential mechanism-Fiaure 12 The gear 2! meshes with the eighty-tooth- 60 gear 2I2, non-rotatably provided on the hollow shaft 2, said hollow shaft being Journalled in the plate 62 extending through and being Journalled in the plate 64, said hollow shaft, between the plates u and n. being provided with the tentooth-gear 2I8, non-rotatably mounted thereon.

The sixty-four-tooth-gear III is rotatably mounted on the hollow shaft 2I4, a spacing washer 228 being provided below the gear 2I8, said gear being provided with the stepped pinions 222 rotatably mounted thereon as at 224. Each stepped pinion 222 consists of the lower twentytooth-pinion 228 meshing withthe pinion 2I8, and the upper ten-tooth-pinion 228 meshing with ed on the shaft 282 which is pivotally received in the hollow shaft 2.

The gear 280 is provided with the hollow sleeve 284 extending upwardly into the space between the plates 56 and 60, being journalled in the plate 66, and said sleeve is provided with the ten-tooth-pinion 236. The spacing washer 288 is provided around the sleeve 284, and the forty-eight-tooth-gear 240 is supported on said washer and rotatably mounted on the sleeve 284.

The gear 240 is provided with the compound pinions 242 rotatably mounted thereon at 244, said compound pinions each including the lower twenty-tooth-pinion 246 meshing with the gear 15 286, and includes the upper ten-tooth-pinion 248 meshing with the gear 260 provided on the sleeve 264. The sleeve 264 is secured to the shaft 266 extending downwardly and ,iournalled in the hollow sleeve 284, and said sleeve 284 is Journa1led in the cover plate 60 and is provided with the money take-eff bevel gear 258.

Units selecting mechanism The units selecting mechanism such as shown in Figures 3, '1, 18, 21 and 24 includes the selecting ring 260 calibrated, in the embodiment shown, in units of a cent from zero to nine cents, and rotatably mounted between the plates 64 and 56, said ring 266 being essentially similar to the ring I40. The ring 260 is provided with the upper peripheral flange 262 provided with the spaced apertures 263, and is provided with the inwardly projecting clutch operating, or selecting, or carrying flange 264. Said ring 260 is seated on the plate 54 by the lower bearing flange 266.

As in the case of the flange I54, the flange 284 is provided with the spaced downwardly projecting track members 268 and 210 adapted to move the clutch members 212 in engaged or disengaged position. vWhen said members are carried by the flange 264 they are in disengaged position, when disposed between the members 268 and 210 they are in engaged position. Said members include the bevelled head 214, and the spaced downwardly projecting fingers or crowns 216, the members being non-rotatably mounted on their respective shafts.

When the members 212 are in clutch engaging position they have moved downwardly over the members 268 or 210 to a point below the inwardly extending retaining and positioning lever 218. Said lever is similar to the lever I14, and is fixedly mounted on the pivot 280 similar to the pivot I16 extending below the ring and being provided with the spaced pins I18 and I80, such as shown in Figure 10, engaging the springs I82 and I84, said springs being secured at their opposite ends to the ring to retain the lever in its outwardly projecting position. The shafts 12, 84, 82, I00, I08, H2, H8, I24, I30 and I36 are projected upwardly into the space between the plates 54 and 66 and within the ring 260, and a shaft 282 is Journaled between said plates 64 65 and 66 and is provided with the sixty-fourtooth-gear 284 meshing with the gear 2I8 of the differential. The gear 284 is provided with the twenty-four-tooth-gear 286 meshing with thesixty-tooth-gear 288 rotatably mounted on the 70 shaft 12 and meshing with the twenty-fourtooth-gear 280 of the one cent (1,) value, said gear being rotatably mounted on the shaft 84.

The gear 280 meshes with the forty-tooth-gear 282 for the five cent (5) value, said gear 282 the twenty-tooth-gear 288, non-rotatably moimtbeing rotatably mounted on the shaft 92. The

assasvs rotatably mountedon the shaft I06, and said gear 296 meshes with the twenty-four-toothgear 296 forthe three cent (23) value, said gear 296 being rotatably mounted on the shaft H2. The gear 296 meshes with the flfty-six-toothgear 300 for the seven cent 01) value, said gear 300 being'rotatably mounted on the shaft III, and said gear 300. meshes with the thirty-twotooth-gear 302 for the four cent (4) value, said gear 302 being rotatably mounted'on the shaft I241 The gear 302 meshes with the sixty-fourtooth-gear 304 for the eight cent (8) value, said gear 304 being rotatably mounted on the shaft I30, and said gear 304 meshes with the seventy- .two-tooth-gear 303 for the nine cent (9) value,

said gear 306 being rotatably mounted on the shaft I36.

The selecting ring 260 is provided with the stations 306 visibly indicating the selected gear or selected price, and is provided with therecesses 3I0 for receiving the locking means for the ring. In the zero position the ring is pro vided with the passageway 3I2 disposed through the flange 260. Each of the gears 290, 292, 294. 296, 296, 300, 302, 304 and 306 are provided with the upwardly extending crowns 3I4 complementary to the crowns 216, being adapted to receive said crowns when the members 212 are moved to clutch engaging position beneath the lever 216 and between the track members 266 and 210 to connect the selected gear to its respective shaft.- 1

Tens selecting mechanism The tens selecting mechanism shown in Fi ures 1, 7, 9, 10, 17, 20 and 23 includes the selecting ring 3I6 similar to the selecting rings I40 and 260, and disposed between the plate 56 and the cover 60. Said ring 3I6 is provided with the upper outwardly extending peripheral flange 3! provided with the spaced apertures 320, and said ring is also provided with a depending flange 322 providing a bearing forsaid ring on the plate 56, As before, the ring is provided with the inwardly extending selecting flange 324 similar to the'flanges I54 and. 264 having the spaced downwardly projecting track members or slopingportions 326 and 323. Between said corresponding to the zero indication. A shaft 344 is journailed between the plate 56 and the cover 60, said shaft being provided with the forty-tooth-gear 349 meshing with the gear 240 of the diflerential, and the gear 346 is provided with the sixteen-tooth-gear 350 meshing with the sixty-four-tooth-gear 352 for the forty cent (40) selection, the gear 352 being rotatably mounted on the shaft I30 which projects through the plate 56 and is journalled in the cover 60.'

The gear 352 meshes with the thirty-two-toothgear 354 corresponding to the twenty cent (20) selection, said gear being rotatably mounted on the shaft-I24 and meshing with the fifty-sixtooth-gear 356 rotatably mounted on the shaft II6, the shafts I24 and H9 projecting through theuplate 56 and being journalled, in the cover a The gear 356 meshes with the twenty-fourtooth-gear 356 rotatably mounted on the shaft H2, and said gear 356 meshes with the fortyeight-tooth-gear 360 corresponding to the thirty cent (30) selection, said gear 300 being'rotatably mounted on the shaft I06, the shafts H2 and I06 projecting through the plate 56, and being journalled in the cover 60. The gear 360 meshes with the sixteen-tooth-gear 362 corresponding to the ten cent (10) selection, said gear 362 being rotatably mounted on the shaft I00 and meshing with the forty-tooth-gear 364 provided for locking the gear train, said gear 364 being rotatably mounted on the shaft 92,

track members the retaining lever 330 is disposed, said lever being similar to the levers I14 and 210, and being provided with the fixed pivot 332 extending through and joumalled in the flange 324, and being provided with the spaced lugs I19 and I (Figure 11) for receiving the springs I02 and I34, said springs being secured at their opposite ends to the under side of said flange.

The sloping portions 326 and 320 are provided to direct the selection of the clutch members 334, said clutch members being similar to\t he clutch members 212 and I64, having the enlarged bevelled heads 336 and the downwardly projecting crowns 336, said members being nonrotatably mounted on their respective shafts. As before, the depending flange 322 is provided with the stations 340 for visibly indicating the price selection or the selection of the gears, and is provided with the recesses 342 (similar to the recesses I43 and 3") corresponding to the selected gears, the passageway 344 being provided the shafts I00 and 92 projecting through the plate 56 and being journalled in the cover 60.

In this device any of the upwardly extending through-shafts 92, I00, I06, H2, H6, I24 or I30 may be projected through the cover 60 for driving an amount counter or registering mechanism. In this particular embodiment the I shaft H9 is shown as projected through said cover, said shaft being provided with the bevel gear 366 for connection to the counter.

Locks for selecting rings In order to lock the locking rings in their selected positions to prevent accidental tuming, the plates 52, 54 and 56 are each provided with locking means such as the locking button and plunger 366, which as shown are conveniently disposed in a vertical plane. Only one looking plunger is shown in Figures 2 and 4, it being understood that the locking plungers are all alike. In this instance the locking plunger is illustrated in different positions for locking the adjacent selecting ring, and for the purpose of this description the selecting ring 3I6 is illustrated, the ring being in its twenty cent (20) position in Figure 2, and in its zero position as shown in Figure 4.

The locking plunger 1363 is provided with the push button 310 for convenient manipulation, said button being urged toward its locking position by means of the spring 312, the plunger being provided with the depending pin 314 adapted to be received in the selected recess 342, in which case the inner locking tooth or projection 316 is spaced from the gear 364 so that the selected gear 354 is operative to rotate the gear train, including gear 364, as idlers, the motion of the gear 354 being transmitted to the differential. When, however, the zero position is selected, the pin 314 is urged into the passage-

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