US1862601A - Impulse sender for use in automatic telephone systems and the like - Google Patents

Impulse sender for use in automatic telephone systems and the like Download PDF

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US1862601A
US1862601A US522060A US52206031A US1862601A US 1862601 A US1862601 A US 1862601A US 522060 A US522060 A US 522060A US 52206031 A US52206031 A US 52206031A US 1862601 A US1862601 A US 1862601A
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arm
ratchet wheel
impulse
key
sending means
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Macadie Donald
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/27—Devices whereby a plurality of signals may be stored simultaneously
    • H04M1/272—Devices whereby a plurality of signals may be stored simultaneously with provision for storing only one subscriber number at a time, e.g. by keyboard or dial

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  • This invention relates to improvements in impulse senders for use in automatic telephone systems and the like.
  • Impulse senders as heretofore proposed have usually comprised an pertured plate which is rotated by hand when it is desired to call a number. It has been necessary with these devices to wait for the dial to come to rest after each individual letter or digit has been dialled, this resulting in quite a considerable loss of time, particularly when a large number of calls have to be handled by a single operator as: in a private branch exchange.
  • the impulse sender comprises a. plurality of depressible keys and a set of contacts which are intended to transmit the impulses over the line, means being provided to cause the said contacts to operate a number of times equal to the number corresponding to any key plus predetermined fixed number when any given key is depressed, and means for suspend ing the action of said impulse sending contacts over a period corresponding to the predetermined fixed number.
  • the keys are preferably attached to key levers which are adapted to operate one or more pivoted members operatively connected to a ratchetwheel, the movement of which controls the movement of the contacts through suitable mechanism.
  • a check pawl is provided for preventing overthrow of the ratchet wheel, the said check pawl operating in a manner hereinafter described.
  • the means for suspending action of the impulse contacts comprises an arm which is adapted to be roc ted in order to press the contacts clear of an interrupter wheel.
  • the impulse sending means are held until after the ratchet wheel has been operated, in 2 order to determine the amount of movement to be made by said impulse sending means and to select a member for splitting the impulses up into the signalling impulses and the spacing impulse.
  • the preferred means for securing this end will be fully described in the following detailed description.
  • the selection members for splitting up the impulses comprise, in the preferred form of the present invention, a plurality of pins which are carried friction-tight in a suitable member although these pins may be replaced by balls or the like as hereinafter described.
  • the machine according to the present invention may be made self winding so that it will not require any attention when once installed.
  • Figure 2 is an end elevation of the device also with the cover removed and as viewed from the left hand end of the device.
  • Figure 3 is a similar view to Figure 2 as viewed, however, from the right hand end of the device.
  • Figure 4 is a fragmentary plan View of the lower portion of the device showing the setting and key'operation parts.
  • Figure 5 is a partial end elevation showing the ratchet and pawl, and the various parts lot) connecting the keys therewith, he parts being shown in the normal position with all keys raised.
  • Figure 6 is a View similar to Figure showing the parts, however, in the position which they assume when one of the keys has been depressed.
  • Figure 7 is a fragmentary view showing the means for securing the transverse movement of the pin operating arm.
  • Figure 8 is a central vertical section through the pin carrying disc.
  • FIGS 9 and 10 are two fragmentary sectional views showing the operation of the stop arm.
  • Figure 11 is a view showing the means for operating the contacts employed for cutting out the transmitter and receiver while the impulses are being sent.
  • Figures 12 and 13 are fragmentary elevations showing the impulse sending contacts and the manner in which they are operated.
  • Figure 14 is a plan view of the parts shown in Figures 12 and 13.
  • Figure 15 is a sectional detail showing the self-winding mechanism of the impulse sending portion of the device.
  • 1 provide a base plate a from which rise back and front plates 6 and 0 respectively, the back plate Z) being disposed at the back edge of the base plate a, and the front plate a being spaced behind the front edge of the base plate a, as shown in Figures 2, 3, 5 and 6.
  • a cover (not shown) is provided to take over the tops of the front and back plates and to cover the ends between the front and back plates 2) and 0 so as to enclose all the mechanism which is arranged between the front and back plates 6 and 0.
  • the front plate 0 is provided with vertically arranged slots 0 conveniently ten in number, each adapted to receive a key lever d.
  • the key levers are all pivoted freely on a transverse spindle (Z arranged close to the back plate 7), and the forward ends of the levers are turned upwardly as at (Z to receive the keys (Z which are preferably arranged in two banks of five keys each (see Figure 1), the keys of the banks being laterally staggered, as shown.
  • a tension spring (Z is connected between each key lever d and a fixed point or bar I), carried by the back plate, in order to return the key d to its normal raised position when depressed.
  • Each of the key levers (Z is provided with a right-angled bearing plate (Z the vertical part of which is slotted as at d and secured w 11 two screws (5 to the lever (Z whilst the horizontal part bears on the upturned edge a of a plate 0 which is pivotally carried on a transverse spindle 6 arranged just behind the front plate 0.
  • the edge e of the plate 6 is inclined to the front plate 0 in the manner shown in Figure 1 so that at the right hand end it is closer to the front plate 0 than it is upward extension on at the left hand end.
  • the bearing plates (Z are provided in order to enable the correct adjustment to be obtained for each individual key.
  • Separate arms may replace the plate a, if desired.
  • the bearing plates are secured to the key levers cl at different points from the fulcrum (see Figure 1), and above the sloping edge e of the plate 0 ihus it will be seen that the hearing plates corresponding to the lower numbers (left hane end of the device) are closer to the fulcrum of the key levers d than the bearing plates on the key levers corresponding to the higher numbers.
  • a tension spring f is provided to raise the plate 0 to its normal position after it has been actuated by the depression of any one key, the aid spring being connected between an eye f" on the plate and a stretcher bar f extending between the front and back plates 5 and 0 near the upper ends of the same ( Figure 6).
  • a stop is also provided, extending downwardly from the stretcher bar in order to limit the upward movement of he plate 6 the lower end of the stop 7' being arranged at such a level that in its raised position the edge e of the plate 6 is maintained in such a position that it is clear of the under edges of the key levers (Z.
  • an arm a Secured to the plate 0 and extending upwardly and then rearwardly is an arm a, to the free end of which at c is pivoted a link 6' extending upwardly.
  • This link a is pivoted at its upper end to an arm g which is freely mounted on a spindle h which extends transversely across the centre of the machine and is carried in the stretcher bar f at one end of the machine and a similar stretcher bar arranged at the other end of the machine.
  • the end of the arm f/ is provided with an which is pivoted a pawl g which is spring-controlled by means of spring (see Figure This pawl is adapted to co-act with a ratchet wheel g which is also freely rotatable on the spindle 11.
  • Such means comprise a check-pawl g which is pivoted on a member 7 carired by the stretcher bar f and which is spring-controlled by means of a light spring so normally to be held in engagement with the teeth of the ratchet wheel 9
  • the check-pawl 9 extends rearwardly as at 9 so as to be engaged by a projection 5/ carried by a rod which extends up the front of the machine and connected at its lower end to a loop carried by a U-shaped arm pivoted as at to the base aof the machine, this arm being arranged above the plate 6 and below the key levers (Z (see Fig ures 5 and 6).
  • a block of hard rubber Z may be arranged in front of the front plate 0, in order to form a resilient buffer for the keys.
  • This method of nullif ing the ill edects of any overthrow has the advantage that very little extra resistance against depression of the keys is provided by the same. This advantage is not secured if a dash-pot, or other like form of device for retarding the operation, is employed, but it will be appreciated that dash-pot or other similar device may be employed in place of the above described mechanism without departing from the scope of the present invention.
  • the selector mechanism by means of which the movement obtained by the depression of the keys is translated so as to give the desired impulses.
  • Such mechanism comprises a ring or other suitable member cured between the front and back plates Z) and c, this member being provided with a number of pins j 104. in the embodiment iilustrated in the drawings).
  • This member j will hereinafter be referred to as the pin disc for the sake of brevity and differentiation.
  • the pins 7' are held friction-tight in holes in the pin disc j and, in order to secure the desired amount of friction, the edge of the pin disc j is grooved (see Figures 10' and 11), the groove being of such depth as to expose the face of the pins located in the holes.
  • a number of turns of thread or the like j are then wound in the groove over the surfaces of the pins, and then a ring of spiral steel spring wire j is sprung into the groove, thus pressing the thread against the pins. This gives sufficient friction on the pins and enables the same at the same time to be moved easily in the holes.
  • pins j are used to control the number of impulses that are sent out by the machine when any particular key is depressed, in manner hereinafter described. Normally the pins j project to the left of the pin disc j, but depression of a key is adapted to cause one of the pins (which is selected in a manner hereinafter described) to be pushed to the right so that it projects on the right of the pin disc 7'.
  • this comprises a sleeve 70 (see Figure 1) which is freely journalled on the spindle it.
  • the sleeve 70 terminates in a cup-shaped member k which is located inside the pin disc.
  • a coil spring see Figure 15
  • the other end of which is connected to a sleeve secured to the ratchet wheel
  • Rotation of the ratchet causes the sleeve to be turned in an anticlockwise direction and so winds up the spring.
  • the sleeve in and the cup-shaped member 70 will follow the sleeve and will rotate in an anticlockwise direction and unwind the spring.
  • the angular movement of the sleeve k and the cup-shaped member are, however, equal and so the parts referred to above comprise a self winding mechanism and consequently there is always spring pressure tending to rotate the sleeve is.
  • the sleeve is is provided with a plate 7s ( Figures 1 and 3) on which are mounted a pinion (not shown) engaging with the toothed inner periphery j of the pin disc j ( Figures This pinion drives the usual type of spring mounted ball governor, part of which can be seen at and also an interrupter wheel is which is provided around its periphery with projections, as shown in Figures 12 and 13.
  • the plate k also carries the set of interrupter contacts k so arranged that as the interrupter wheel 70 rotates under the same they are closed and opened one for each projection on the periphery of the interrupter Wheel.
  • Figure 12 shows the interrupter contacts 10 closed (not, however,
  • FIG. 13 shows the interrupter contacts open, being free of the projections on the interrupter wheel.
  • the interrupter contacts 70 are con nectedby lengths of wire 7: to a pair of slip rings 70 carried by the sleeve 70, these slip rings being connected to the connection leads by a pair of wire brushes Z1310 sliding on the sli rings 70".
  • ihlse pivoted on the plate 70 and on an axis nnich is parallel to the axis of the spindle h is a rocking lever, the one arm of which is is turned so as to lie under the interrupter contacts 70 (see Figures 12 to 14;), and the other arm 70 of which is curved so as to conform to the curvature of the pin circle in the pin disc j.
  • This rocking lever is, 10 is spring-controlled by reason of the springiness of the interrupter contacts 70 so as normally to raise the arm 76 into the pin circle (see Figure 18).
  • the plate 70* is arranged in close proximity to the right hand face of the pin disc and, as explained above,
  • the pins j do not normally project beyond the righthand face. ⁇ Vhen, however, a pin does project beyond the right hand face, the arm 70 is depressed in passing under the same, and this causes the arm 70 to be raised to close the interrupter contacts. The interrupter contacts 70 remain closed for such time as it takes for the arcuate surface is of the arm Z5 to pass under the pin that projects.
  • a side-way extension 70 of the plate 76 also carries a curved wiper arm 70 which is disposed opposite the pin circle in the pin disc and which is arranged at its free end in close proximity to the face of the pin disc.
  • the arm thus presents an inclined plane which, when it reaches any pins that may project on the right hand side of the pin disc, wipes over the same and returns the pin 7' to its normal position in which it projects on the left hand side of the pin disc ready for further operation when required.
  • This striker arm is slotted, as at Z and in the slot are disposed two pins Z carried by the ratchet wheel 9 these pins accurately locating the striker arm Z.
  • T he arm Z is expanded into a disc Z which takes about the sleeve is and is extended on the further side of the sleeve, as at Z*, being connected to the ratchet wheel 9 by a blade spring Z.
  • the arm Z is thus free to move transversely with respect to the ratchet wheel 9 and is returned to its normal position by means of the spring Z.
  • the striker arm is located close to the pin disc on the left hand side (see Figure 1) and is so arranged that, in its normal position, it is clear of all the pins y' which project on the left hand side whi e, when it is moved transversely on its spring, it engages with one pin and pushes the same until it projects on the right hand side of the pin disc to operate the arm Zr, as above described.
  • the striker arm Z is adapted to be moved transversely so as to move a pin near the end of the return of the ratchet g engaging the ratchet wheel g and the means for accomplishing this comprise a plate m which passes about the spindle it, see Figure 7, and which is connected to the front plate or to the member thereon through a small blade spring m so that the plate is free to oscillate backwards and forwards on the spindle h, it being always returned after operation to the position shown in full lines in Figure 7 by the spring m
  • the forward end of the plate m, which is disposed on the further side of the spindle h to the member 7, is bevelled off as at m
  • Secured to the sleeve Z2 carrying the ratchet wheel g is an arm n, the outer end of which is turned back so as to provide a tongue n which in the normal position in which the mechanism is at rest is disposed above the bevelled end m of the arm M.
  • the arm m After moving out to the position shown in dotted lines in Figure 7, the arm m returns to its normal position under the influence of the spring m so as to be ready to operate again when a further key is actuated to cause rotation of the iii) which projects through the ratchet wheel 9
  • This transverse movement of the arm m is used to give a transverse movement of the striker arm Z in the following manner; the striker arm Z is provided with a pair of pins Z arranged on opposite sides of the spindle h, and projecting through the ratchet wheel so to lie in contact with or in close proximity to the arm m in the normal position (see the full line position of Figure 7).
  • the mechanism is so arranged that the plate is and the impulse sending mechanism does not commence to move until the selected pin has been moved to project on the right hand side of the pin disc
  • the means of securing this holding up or" the movement comprises a ratchet arm 0 which is journalled freely about the spindle 7L and connected through a tension spring 0 to the ratchet wheel 9 this spring being connected to a pro jection 0 on the a m 0 (see Figure 8).
  • a stop member 0 pivoted on the ratchet wheel 9 as at 0 is a stop member 0 the movement of which is limit d in both directions by means of a pin 0 on the ratchet wheel 9
  • the stop member is also spring-controlled by means of a tension spring 0 and is provided with a turned up arm 0 disposed in the path of the ratchet arm 0.
  • the ratchet arm 0 engages with the internally ratchet toothed periphery of a ring p which is mounted in ball bearings (not shown) in the pin disc 7'.
  • the ratchet ring p is held against any appreciable amount of rotation by means of a slot 22 therein with in which is disposed one end of a spring p pin disc (see Figure and is provided outside the same with a button p engaging with spring contacts 79 (see Figures 11 and 1) which are'wired in circuit so as to cut out the transmi ter and receiver.
  • the plate Z1 is provided with a pin 0 (see Figure 8) which abuts against the ratchet arm 0 so that the plate 70 and its associated parts are thereby held stationary, the ratchet arm engaging with the ratchet teeth on the ring p.
  • the ratchet teeth on the ring 3) are, however, tapered (see Figures 9 and'lO) so that a transverse movement of the ratchet arm 0 will operate to tree the same from the ratchet teeth.
  • the arm 0, as shown in Figures 9 and 10 lies in close pr Ximity to the striker arm Z so that when the striker arm is moved transversely, the arm 0 is likewise moved and freed from the ratchet teeth.
  • the arm has sufficient time to fly round to its nor mal position before the striker arm returns to its normal position.
  • a blade spring or the like 0 is provided (see Figures 9 and 10) hearing on the arm 0 to return the same to its normal position in engagement with the ratchet teeth, when the striker arm has moved back.
  • the ratchet arm 0 has reached to its new position, it forms a new stop for the pin 0 on the plate k and hence, since the removal of the arm 0 trees the pin 0 the plate k and its associated impulse mechanism are free to rotate under the action of the spring 762.
  • the pull of the spring 0 plus the pressure exerted on the ring p by the blade spring 72 are sufficient to overpower the pull of the spring 0 on the arm 0 and hence, when the arm 0 flies round, it does not at once as sume its final position, it merely abuts against the stop member 0 which remains in a position with its outer arm in contact with the pin 0 T'Vhen the plate 76 however, has nearly completed its movement, the pin 0 thereon abuts against the arm 0 and adds an additional force, tending to overpower the pull of the spring 0 The pressure of the spring a transmitted through the pin 0 to the arm 0.
  • the spring 0 is suflicient to overcome the combined action of the springs 0 and 39 so that the ring 12 is moved around slightly (a distance equal to one tooth).
  • the stop member 0 thereupon swings until its inner arm abuts against the pin 0 which thus forms a positive stop.
  • the ll'lOVQil'lQllb of the ring p pushes the spring out and causes operation of the contacts 29
  • the transmitter and receiver are immediately brought into circuit, but when the impulse sender is moving to send out the impulses, the transmitter and receiver are cut out of circuit, in the usual manner.
  • This spacing impulse should be of a duration equal to, at least, five signalling impulses in the systems at present in use, in order that the slow acting relays employed may be allowed to operate. Accordingly, in order that time may be saved, the mechanism according to the present invention is so arranged that a spacing impulse equal in duration to five signalling impulses is given out between each set of signal impulses.
  • the key operating mechanism is so proportioned that depression of any one key causes the ratchet wheel to be rotated by an amount equal to the number of the key depressed, plus the spacing.
  • the spacing impulse shall be equal in duration to five signal impulses (it may be longer or shorter as required)
  • the key, corresponding to the number 1 would cause the ratchet wheel to be rotated six steps (say teeth)
  • the key corresponding to the numeral 2 would cause the ratchet wheel g to be rotated seven teeth and so on.
  • Rotation of the ratchet wheel results in a similar angular movement of the striker arm Z and hence depression of the key correspond ing to the numeral 1 would cause the striker arm to be advanced six pins (and to actuate the sixth pin to cause the same to project on the right hand side of the pin disc depression of the key corresponding to the numeral- 2 would cause actuation of the seventh pin and so on.
  • operation of the striker arm allows the plate and its associated impulse sending mechanism to operate, and this impulse sending mechanism is so arranged that one impulse is sent out when the plate 14' rotates through an angle corresponding to the distance between two pins. Accordingly six impulses are given by depression of the key 1 and seven impulses are given by depression of the key 2 and so on. These sets of impulses are, however, split up into the spacing impulse 5) and the number of individual impulses (which will, of course, correspond to the number of the key) by means of the arm X1 1: which cuts out the impulse sending contacts over the spacing interval.
  • the mechanism according to the present invention is, therefore, practically fool proof and will enable a great saving of time to be obtained particularly on private branch exchanges and the like where a large number of calls are sent out.
  • I may employ balls.
  • the keys and stop are so arranged that the movement of the impulse wheel is the correct amount for the depressed key; thus a movement of six pins for the digit 1, seven pins for the digit 2 and so on.
  • the spacing impulse may be lengthened or shortened as desired.
  • An impulse sender for use in automatic telephone systems and the like, comprising a plurality of depressible keys each corresponding to a number, a set of interrupter contacts to transmit the impulses over the line, means for causing operation of said contacts, setting mechanism controlled by saic depressible keys to set said contact operating means so that for any key depressed said contact operating means will cause said contacts to be interrupted a number of times equal to the number corresponding to the key depressed, plus a fixed number, and means for suspending the action of said impulse sending contacts over a period corresponding to the predetermined fixed number.
  • An impulse sender for use in automatic telephone systems and the like, comprising a plurality of depressible keys each corresponding to a number, a set of interrupter contacts to transmit the impulses over the line, means for causing operation of said contacts, setting mechanism controlled by said depressible keys to set said contact operating means so that for any key depressed said contact operating means will cause said contacts to be interrupted a number of times equal to the number corresponding to the key depressed, plus a fixed number, means for suspending the action of said impulse sending contacts over a period corresponding to the predet'rmined fixed number and means for holding up said contact operating mechanism until atte' the first depressed key of any equence has been released.
  • An impulse sender for use in automatic telephone systems and the like, comprising a plurality of depressible keys, a set of contacts adapted to transmit impulses over the line, an interrupter wheel to operate said contacts, means for driving said interrupter wheel, means controlled by said depressible keys for limiting the operation of said means for driving said interrupter wheel so that for depression of any one key the contacts are operated a number of times equal to the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, and means for suspending the action of said impulse sending contacts over a period corresponding to the predetermined fixed number.
  • An ilIIPlliSQ sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed )lus, in all cases, a predetermined fixed number, impulse sending means, means operatively connected with said ratchet wheel to control the movement oi the impulse sending means and means for suspending operation of said impulse sending means over a period corresponding to the predetermined fixed number of impulses.
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of dcpressible keys, a ratchet wheel, levers attached to said keys, a pivoted member operati ely connected to said ratchet wheel and adapted to be moved by said key levers to cause operation of said ratchet wheel through an arc, the magnitude of which Varies in accordance with the number cor responding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, means operatively connected with saio ratchet wheel to control the movement of the impulse sending means and means for suspending opera ion of said impulse sending means over a period corresoonding to the predetern'iinet fined number of impulses.
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel. key levers attached to said keys, a pivoted member operatively connected to said ratchet wheel and adapted to be moved by said key levers to cause operation of said ratchet wheel through an arc, the magnitude of which varies in accordance with the number correspondin to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, means operatively connected with said ratchet wheel to control the movement of the impulse sending means, means for suspending operation of said impulse sending means over a period corresponding to the predetermined fixed number of impulses, and means adapted to return each key to its raised position independent of the other keys.
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, means operatively connected with said ratchet wheel to control the movement of the impulse sending means, means for suspending operation of said impulse sending means over a period correspondin to the predetermined fixed number of impulses, a check-pawl co-operating with said ratchet wheel to prevent rotation of the same in a reverse direction, means for raising said check-pawl from said ratchet operatively connected with said key setting mechanism so that when any key is depressed said check-pawl is raised clear of said ratchet wheel, and means for returning said checkpawl into engagement with the ratchet wheel as soon as said depressed key is released.
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, means operatively connected with said ratchet wheel to control the movement of the impulse sending means, means for suspending operation of said impulse sending means over a period corresponding to the predetermined fixed number of impulses, a check-pawl cooperating with said ratchet wheel to prevent rotation of the same in a reverse direction, means for raising said check-pawl from said ratchet operatively connected with said key setting mechanism so that when any key is depresse i said check-pawl is raised clear of said ratchet wheel, means “for returning said check-pawl into engagement with the ratchet wheel as soon as said depressed key is released and means adapted to return each key to its raised position independent of the other keys.
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, an arm, the movement of which is limited to the move ment of said ratchet wheel, a ratchet ring en gaged by said arm, means for freeing said arm from said ratchet ring to allow the same to move, an abutment on said impulse send ing means to engage with said arm and assist the movement of said impulse sending means, and means for suspending operation of said impulse sending means over a period corresponding to the predetermined fixed number of impulses.
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, a pivoted arm, a stop on said ratchet wheel to limit the movement of said arm, a ratchet ring engaged by said arm, means for freeing said arm from said ratchet ring after the ratchet wheel has been set in accordance with the key depressed so as to allow said arm to move and again engage said stop on said ratchet wheel, an abutment on said impulse sending means to engage with said arm and arrest the movement of said impulse sending means and means for suspending operation of said impulse sending means over a period corresponding to the predetermined fixed number of impulses.
  • a impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, a pivoted arm, a.
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, a pivoted arm, a stop on said ratchet wheel to limit the movement of said arm, a ratchet ring engaged by a said arm, cut away teeth to said ratchet ring adapted to hold said arm until.
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, a pivoted arm, a stop on said ratchet wheel to limit the movement of said arm, a ratchet ring engaged by said arm, an arm connected to and moving with the ratchet wheel operating mechanism, an inturned tongue to said arm, a further arm engaged by said inturned tongue and held so that as said inturned tongue moves with the ratchet wheel it imparts to said further arm a sharp transverse movement during its return movement, means for causing said transverse movement of said further arm to be transferred to said arm engaging with said ratchet ring to free the same from the teeth thereof after the ratchet wheel has been set in accordance with the key depressed so as to allow said arm to move and again engage said stop on said ratchet
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, a pivoted arm, a stop on said ratchet wheel to limit the movement of said arm, a ratchet ring engaged by said arm, means for freeing said arm from ice izo
  • a tension spring connected between said ratchet wheel and said arm to cause said arm to move and again engage with said stop on said ratchet wheel, an abutment on said impulse sending means to engage with said arm and arrest the movement of said impulse sending means and means for suspending operation of said impulse sending means over a period corresponding to the predetermined fixed number of impulses.
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, a pivoted arm, a stop on said ratchet wheel to limit the movement of said arm, a ratchet ring engaged by said arm, means, operated after the ratchet wheel has been set to correspond to the key depressed, for moving said arm transversely with respect to said ratchet ring in order to free said arm from the teeth thereof, a tension spring connected between said ratchet wheel and said arm to cause said arm to move and again engage with said stop on said ratchet wheel, an abutment on said impulse sending means to engage with said arm and arrest the movement of said impulse sending means and means for suspending operation of said impulse sending means over a period corres ponding to the predetermined fixed number of impulses.
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, a pivoted arm, a stop on said ratchet wheel to limit the movement of said arm, a ratchet ring engaged by said arm, an arm connected to and moving wi h the ratchet wheel operating mechanism, an inturned tongue to said arm, a further arm engaged by said inturned tongue and held so that as said inturned tongue moves With the ratchet wheel it imparts to said further arm a sharp transverse movement during its return movement, means for causing said transverse movement of said further arm to be transferred to said arm engaging with said ratchet ring to free the same from the teeth thereof after the ratchet wheel has been set in accordance with the key depressed, a tension spring connected between said ratchet wheel and said arm to
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to 0perate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, a pivoted arm, a spring controlled stop on said ratchet wheel to limit the movement of said arm, a ratchet ring engaged by said arm, means for freeing said arm from said ratchet ring after the ratchet wheel has been set in accordance with the key depressed so as to allow said arm to move and again engage said spring controlled stop on said ratchet wheel, an abutment on said impulse sending means to engage with said arm and arrest the movement of said impulse sending means and means for suspending operation of said im pulse sending means over a period corresponding to the predetermined fixed number of impulses.
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a. ratchet wheel, key setting mechanism adapted to operate .said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed num ber, impulse sending means, a pivoted arm, a spring controlled stop on said ratchet wheel to limit the movement of said arm, a ratchet ring engaged by said arm, an arm connected to and moving with the ratchet wheel operating mechanism, an inturned tongue to said arm, a further arm engaged by said inturned tongue and held so that as said inturned tongue moves with the ratchet wheel it imparts to said further arm a sharp transverse movement du 'ing its return movement, means for causing said transverse movement of said further arm to be transferred to said arm engaging with said ratchet ring to free the same from the teeth thereof after the ratchet wheel has been set in accordance with the key depressed so as to allow said arm to
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number Corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, a pivoted arm, a spring controlled stop on said ratchet wheel to limit the movement of said arm, a ratchet ring engaged by said arm, an arm connected to and moving with the ratchet wheel operating mechanism, an inturned tongue to said arm, a further arm engaged by said inturned tongue and held so that as said inturned tongue moves with the ratchet wheel it imparts to said further arm a sharp transverse movement during its return movement, means for causing said transverse movement of said further arm to be transferred to said arm engaging with said ratchet ring to free the same from the teeth thereof after the ratchet wheel has been set in accordance with the key depressed, a tension spring connected between said ratchet wheel and said arm
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accord ance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, a pivoted arm, a stop on said ratchetwheel to limit the movement of said arm, a ratchet ring mounted so as to be capable of a small rotary movement and engaged by said arm, an arm connected to and moving with the ratchet wheel operating mechanism, an inturned tongue to said arm, a further arm engaged by said inturned tongue and held.
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, a pivoted arm, a stop on said ratchet wheel to limit the movement of said arm, a ratchet ring mounted so as to be capable of a small rotary movement and engaged by said arm, an arm connected to and moving with the ratchet wheel operating mechanism, an inturned tongue to said arm, a further arm engaged by said inturned tongue and held so that as said inturned tongue moves with the ratchet wheel it imparts to said further arm a sharp transverse movement during its return movement, means for causing said transverse movement of said further arm to be transferred to said arm engaging with said ratchet ring to free the same from the teeth thereof after the ratchet wheel has been set in accordance with the key depressed, a tension
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, means operatively connected with said ratchet wheel to control the movement of the impulse sending means, means for suspending operation of said impulse sending means over a period corresponding to the predetermined fixed number of impulses, said last mentioned means including a pin disc, a plurality of pins carried by said pin disc, a striker arm operated from said ratchet wheel at the end of its movement to displace one of said pins, contacts carried by said impulse sendlng means, means for interrupting said contacts and a rocking arm also carried by said impulse sending means and adapted to be engaged by the displaced pin to close the said contacts and suspend thereby the etlective operation of the contact interrupting means.
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchetwheel, key levers attached to said keys, a pivoted member operatively connected to said ratchet wheel and adapted to be moved by said key levers to cause operation of said ratchet w iecl through an arc, the magnitude of which varies in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, means operatively connected with said ratchet Wheel to control the movement of the impulse sending means, means for suspe ding operation of said impulse sending nicans over a period corresponding to the predetermined fixed number of impulses, said last mentioned means including a pin disc, a plurality of pins car ricd by said pin disc, a.
  • striker arm operated from said ratchet wheel at the end of its movement to displace one of said pins, contacts carried by said impulse sending means, means for interrupting said contacts and a rocking arm also carried by said impulse sending means and adapted to be engaged by the displaced pin to close the said contacts and suspend thereby the eiiective operation of the contact interrupting means.
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, an arm, the movement of which is lim-- ited to the movement of said ratchet wheel, a.
  • ratchet ring engaged by said arm, means for freeing said arm from said ratchet ring to allow the ame to move, an abutment on said impulse sending means to engage with said arm and arrest the movement of said impulse sending means, means for suspending operation or" said impulse sending means over a period corresponding to the predeter-- mined fixed number of impulses, said last mentioned means including a pin disc, a plurality of pins carried by said pin disc, av striker arm operated from said ratchet wheel at the end of its movement to displace one of said pins, contacts carried by said impulse sending means, means for interrupting said contacts and a rocking arm also carried by said impulse sending means and adapted to be engaged by the displaced pin to close the said contacts and suspend thereby the effective operation of the contact interrupting means.
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, a pivoted arm, a stop on said ratchet wheel to limit the movement of said ram, a ratchet ring engaged by said arm, an arm connected to and moving with the ratchet wheel operating mechanism, an inturned tongue to said arm, a further arm engaged by said inturned tongue and held so that as said inturned tongue moves with the ratchet wheel it imparts to said further arm a sharp transverse movement during its return movement, means for causing said transverse movement of said further arm to be transferred to said arm engaging with said ratchet ring to free the same from the teeth thereof after the ratchet wheel has been set to allow said arm to move and again engage said stog on said ratchet wheel, an a
  • An impulse sender for use in the automatic telephone systems and the like comprising a plurality of depressible keys, a
  • impulse sending means a pivoted arm, a stop on said ratchet wheel to limit the movement of said arm, a ratchet ring engaged by said arm, an arm connected to and moving with the ratchet wheel operating mechanism, an inturned tongue to said arm, a further arm ongaged by said inturned tongue and held so that as said inturned tongue moves with the ratchet wheel it imparts to said further arm a sharp transverse movement during its return movement, means for causing said transin accordance with the key depressed so as '2 verse movement of said further arm to be transferred to said arm engaging with said ratchet ring to free the same from the teeth thereof after the ratchet wheel has been set in accordance with the key depressed, a tension spring connected between said ratchet wheel and said arm to cause said arm to move and again engage with said stop on said ratchet wheel, an abut
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, means operatively connected with said ratchet wheel to control the movement of the impulse sending means, means for suspending operation of said impulse sending means over a period corresponding to the predetermined fixed number of impulses, said last mentioned means including a pin disc, a plurality of pins carried by said pin disc, a striker arm operated from said ratchet wheel at the end of its movement to displace one of said pins, contacts carried by said impulse sending means, means for interrupting said contacts and a rocking arm also carried by said impulse sending means and adapted to be engaged by the displaced in to close the said contacts and suspend thereby the eiiiective operation of the contact interrupting means, and means for returning the displaced pin after it has operated the rocking
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, a pivoted arm, a stop on said ratchet wheel to limit the movement of said arm, a ratchet ring engaged by said arm, an arm connected to and moving with the ratchet wheel operating mechanism, an inturned tongue to said arm, a further arm engaged by said inturned tongue and held so that as said inturned tongue moves with the ratchet wheel it imparts to said further arm a sharp transverse movement during its return movement, means for causing said transverse movement of said further arm to be transferred to said arm engaging with said ratchet ring to free the same "from the teeth thereof after the ratchet wheel has been set in accordance with the key depressed so as to allow said arm to move and again engage said stop on said rat
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, a pivoted arm, a stop on said ratchet wheel to limit the movement of said arm, a ratchet ring engaged by said arm, an arm connected to and moving with the ratchet wheel operating mechanism, an inturned tongue to said arm, a further arm engaged by said inturned tongue and held so that as said inturned tongue moves with the ratchet wheel it imparts to said :turther arm a sharp transverse movement during its return vmovement, means for causing said transverse movement of said further arm to be transferred to said arm engaging with said ratchet ring to free the same from the teeth thereof after the ratchet wheel has been set in accordance with the key depressed, a tension spring connected between said ratchet
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, means operatively connected with said ratchet wheel to control the movement of the impulse sending means, means for suspending operation of said impulse sending means over a period corresponding to the predeterminedfixed number of impulses, said last mentioned means including a pin disc, a plurality of pins carried by said pin disc, a striker arm operated from said ratchet wheel at the end of its movement to displace one of said pins, contacts carried by said impulse sending means, means for interrupting said contacts and a rocking arm also carried by said impulse sending means, and having a surface adapted to engage said displaced pin to cause said rocking arm to rock and so close said contacts and suspend the eifective operation of the contact interrupting means, the length of said surface of the rock
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapt-ed to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, means operatively connected with said ratchet wheel to control the movement of the impulse sending means, means for suspending operation of said im pulse sending means over a period corresponding to the predetermined fixed number of impulses, said last mentioned means ineluding a pin disc, a plurality of pins carried by said pin disc, a striker arm operated from said ratchet wheel at the end of its movement to displace one of said pins, contacts carried by said impulse sending means, means for interrupting said contacts and a rocking arm also carried by said impulse sending means, and having a surface adapted to engage said displaced pin to cause said rocking arm to rock and so close said contacts and suspend the effective operation of the contact interrupting means, the length of said
  • An impulse sender for use in automatic telephone systems and the like comprising a. plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, a pivoted arm, a stop on said ratchet wheel to limit the movement of said arm, a ratchet ring engaged bysaid arm, an arm connected to and moving with the ratchet wheel operating mechanism, an inturned tongue to said arm, a further arm engaged by said inturned tongue and held so that as said inturned tongue moves with the ratchet wheel it imparts to said further arm a sharp transverse movement during its return movement, means for causing said transverse movement of said further arm to be transferred to said arm engaging with said ratchet ring to free the same from the teeth thereof after the ratchet wheel has been set in accordance with the key depressed, a tension spring connected between said ratchet wheel and said arm
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, a pivoted arm, a stop on said ratchet wheel to limit the movement of said arm, a ratchet ring engaged by said arm, an arm connected to and moving with the ratchet wheel operating mechanism, an inturned tongue to said arm, a further arm engaged by said inturned tongue and held so that as said inturned tongue moves with the ratchet wheel it imparts to said further arm a sharp transverse movement during its return movement, means for causing said transverse movement of said further arm to be transferred to said arm engaging with said ratchet ring to free the same from the teeth thereof after the ratchet wheel has been set in accordance with the key depressed, a tension spring connected between said ratchet wheel and said arm to cause
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel,
  • key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, inv all cases, a predetermined fixed number
  • impulse sending means means operatively connected with said ratchet wheel to control the movement of the impulse sending means, means for suspending operation of said impulse sending means over a period corresponding to the predetermined fixed number of impulses
  • said last mentioned means including a pin disc, a plurality of pins carried by said pin disc, a striker arm operated from said ratchet wheel at the end of its movement to displace one of said pins, contacts carried by said impulse sending means, means for interrupting said contacts and a rocking arm also carried by said impulse sending means adapted to be engaged by the displaced pin to close the said contacts and suspend thereby the effective operation of the contact interrupting means, and a wiper arm carried by said impulse sending means and disposed behind the rocking arm in the direction of movement of the impulse sending means, said wiper arm being adapted to engage the displaced pin and return the same to its normal position.
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, means operatively connected with said ratchet wheel to control the movement of the impulse sending means, means for suspending operation of said impulse sending means over a period corresponding to the predetermined fixed number of impulses, said last mentioned means including a pin disc, a plurality of pins carried by said pin disc, a striker arm operated from said ratchet Wheel at the end of its movement to displace one of said pins, contacts carried by said impulse sending means, means for interrupting said contacts and a rocking arm also carried by said impulse sending means, having a surface adapted to engage said displaced pin to cause said rocking arm to rock and so close said contacts and suspend the efiective operation of the contact interrupting means, the length of said surface of the rocking
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, a pivoted arm, a stop on said ratchet wheel to limit the movement of said arm, a ratchet ring engaged by said arm, an arm connected to and moving with the ratchet wheel operating mechanism, an inturned tongue to said arm, a further arm engaged by said inturned tongue and held so that as said inturned tongue moves with the ratchet wheel it imparts to said further arm a sharp transverse movement during its return movement, means for causing said transverse movement of said further arm to be transferred to said arm engaging with said ratchet ring to free the same from the teeth thereof after the ratchet wheel has been set in accordance with the key depressed, a tension spring connected between said ratchet wheel and said arm to cause
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, means operatively connected with said ratchet wheel to control the movement of the impulse sending means, means for suspending operation of said impulse sending means over a period correspondin to the predetermined, fixed number of impulses, said last mentioned means including a pin disc, a plurality of pins carried by said pin disc, a striker arm carried by said ratchet wheel in such a manner as to be incapable of rotary movement on the same, but free to move transversely with respect to the same, said striker arm being connected to said further arm engaged by said inturned tongue and adapted to be moved transversely thereby in order to dis place one of said pins, contacts carried by said impulse sending means, means for interrupting said contacts and a rocking arm also carried by said
  • the length of said surface of the rocking arm adapted to engage said pin being such that the effective operation of the contact interrupting means is suspended over a period corresponding to a number of interruptions equal to the predetermined fixed number which is added in all cases.
  • An impulse sender for use in automatic telephone systems and the like, comprising a plurality of depressible keys each corresponding to a number, a set of interrupter contacts to transmit the impulses over the line, means for causing operation of said contacts, setting mechanism controlled by said depressible keys to set said contact operating means so that for any key depressed said contact operating means will cause said contacts to be interrupted a number of times equal to the number corresponding to the key depressed, plus a fixed number, means for suspending the action of said impulse sending contacts over a period correspond-.
  • said means including a setting member, abutments, one of which is adapted to be selectively displaced by said setting member when operated by the depression of a key, and a rocking arm carried by said impulse sending means to suspend the efiective operation of said contact operating means.
  • An impulse sender for use in automatic telephone systems and the like, comprising a plurality of depressible keys each corresponding to a number, a set of interrupter contacts to transmit the impulses over the line, means for causing operation of said contacts, setting mechanism controlled by said depressible keys to set said contact operating means so that for any key depressed said contact operating means will cause said cont-acts to be interrupted a number of times equal to the number corresponding to the key depressed, plus a fixed number, means for suspending the action of said impulse sending contacts over a period corresponding to the predetermined fixed number, means for holding up said contact operating mechanism until after the first depressed key of any sequence has been released, said means including a setting member, abutments, one of which is adapted to be selectively displaced by said setting member when operated by the depression of a key, and a rocking arm carried by said impulse sending means to suspend the eifective operation of said contact operating means.
  • An impulse sender for use in automatic telephone systems and the like, comprising a plurality of depressible keys, a set of: contacts adapted to transmit impulses over the line, an interrupter wheel to operate said contacts, means for driving said interrupter wheel, means controlled by said depressible keys for limiting the operation of said means for driving said interrupter wheel so that -for depression of any one key the contacts are operated a number of times equal to the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, means for suspending the action of said impulse sending contacts over a period corresponding to the predetermined fixed numher, said means including a setting member, abutments, one of which is adapted to be selectively displaced by said setting member when operated by the depression or a key, and a rocking arm carried by said impulse sending means to suspend the effective operation of said contact operating means.
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, means operatively connected with said ratchet wheel to control the movement of the impulse sending means, means for suspending operation of said impulse sending means over a period corresponding to the predetermined fixed number of impulses, said means including a setting member, abutments, one of which is adapted to be selectively displaced by said setting member when operated by the depression of a key, and a rocking arm carried by said impulse sending means to suspend the effective operation of said contact operatlng means.
  • An impulse sender for use in automatic telephone systems and the like comprising a plurality of depressible keys, a ratchet wheel, key setting mechanism adapted to operate said ratchet wheel in accordance with the number corresponding to the key depressed plus, in all cases, a predetermined fixed number, impulse sending means, means operatively connected with said 'atchet wheel to control the movement of the impulse sending means, means for suspending operation of said impulse sending means over a period corresponding to the predetermined fixed number of impulses, a check-pawl cooperating with said ratchet wheel to prevent rotation of the same in a reverse direction, means

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2451358A (en) * 1944-08-24 1948-10-12 Automatic Elect Lab Impulse transmitter
US2947824A (en) * 1956-05-21 1960-08-02 Western Electric Co Apparatus for testing automatic telephone exchange equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2451358A (en) * 1944-08-24 1948-10-12 Automatic Elect Lab Impulse transmitter
US2947824A (en) * 1956-05-21 1960-08-02 Western Electric Co Apparatus for testing automatic telephone exchange equipment

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BE378298A (nl)
FR713591A (fr) 1931-10-29

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