US3153704A - Current impulse transmitter - Google Patents

Current impulse transmitter Download PDF

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Publication number
US3153704A
US3153704A US216137A US21613762A US3153704A US 3153704 A US3153704 A US 3153704A US 216137 A US216137 A US 216137A US 21613762 A US21613762 A US 21613762A US 3153704 A US3153704 A US 3153704A
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Prior art keywords
locking
cam
wheel
cams
follower
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US216137A
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English (en)
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Sauer Hans
Gaiser August
Weber Willi
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Individual
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Individual
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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
    • H04M1/274—Devices whereby a plurality of signals may be stored simultaneously with provision for storing more than one subscriber number at a time, e.g. using toothed disc

Definitions

  • the purpose of the invention is to ensure reliable actuation of and very safe operation of such a pulsing device of low production cost.
  • a pulsing device for telephone installations which is operated by interchangeable cams which are longitudinally non-displaceable and can be rotated mechanically by means of a power drive.
  • the control combinations in any given case are set on the cams.
  • a common locking pawl and individual movable follower member each serving to follow one cam.
  • the followers are moved manually from their rest position to their operating position.
  • the followers remain in the operating position for the duration of the selection process, automatically connect the power drive for the cams, and disconnect the apparatus again, returning the elements which were moved to their initial state, when a person has been selected by transmitting the desired number-combination by operation of a key.
  • the followers are in range both of the corresponding cam and of the locking pawl.
  • the short-circuiting contact operated transmitted the impulses to the telephone network.
  • the invention aims to avoid these disadvantages and to construct the pulsing device so that it can be manufactured with comparatively little precision, for example by stamping the individual members, and yet has a high degree of accuracy in transmitting series of impulses, is very reliable in operation and makes wrong connections extremely improbable if not impossible.
  • the moved locking pawl acting through a clutch, drives an impulse and a looking wheel and thus operates the impulsing send and interval contacts.
  • the clutch prefferably be a slipping clutch which is driven by the drive for the cam and is locked by an impulse pawl which engages in the locking wheel and which simultaneously closes the send contact when the locking pawl causes the locking wheel to be released.
  • the locking pawl actuate a clutch.
  • the clutch then ensures that, by operating the appropriate send and interval contacts, an impulse is followed by the correct interval by an interruption of the loop.
  • the pawl is now used only to release the clutch and no longer has the function of transmitting both the send impulse and the interval in the correct relative rhythm.
  • the clutch itself is constructed with the locking and the impulse wheel mounted against relative rotation on a hollow bush with a friction surface, the hollow bush being mounted on the driving shaft and resiliently urged against the friction surface which is fixed to the latter.
  • the locking and the impulse wheel operate the send and the interval contact respectively.
  • An impulse pawl drops into the locking wheel which is simultaneously operating the send contact, so that at an exactly defined point of time when the locking pawl makes the impulse pawl move, the send and interval contacts are successively closed at the correct timing sequence, the sequence of send impulses and intervals is now as accurate as if interruption were effected directly from a dial.
  • the movement of the locking pawl no longer needs to initiate exactly the interval of time between the impulses and the interruptions, since it is only responsible for starting and stopping the clutch after each impulse. Any errors which may arise due to inaccuracy in manufacture thus make themselves felt only during a short partial movement of the clutch, and when the next movement is made release is once more accurate.
  • the driving shaft for the clutch is preferably connected to the drive for the cams by a worm drive.
  • the impulse wheel and the locking wheel are preferably each provided with three recesses offset by which alternately open the interval contact when the send contact is closed and vice versa.
  • the starting position defined which is arrived at following appropriate operation by the locking pawl after the impulse pawl has dropped, enables the locking wheel, so to speak, to run always from zero without allowing any errors to be summated, as stated above. Since there are three cams offset by 120, the path corresponding to the 120 is available to compensate for any errors. It is a simple matter to use suitable reductions or possibly more or less cams in order to gain still more time to compensate for errors occurring when the movement is transferred from the raised and recessed portions of the cam until the clutch is released.
  • a stop lever which is moved in known manner by the follower and allows the cam to rotate, has a pawl at the end facing the follower, which pawl positively engages the follower and is in the region of the switch for the drive, the switch being attached to one end of an angle lever of which the other end is acted upon by a switching cam connected to the control cams.
  • This construction makes use of a switch with a movable operating lug. The effect of this is that whenever it is at all possible to operate the switch the apparatus is ready for use. If the operating lug is outside range of the pawl, the switch cannot be operated. By simply adjusting this conveniently designed microor snap-switch great operating safety can be obtained with simple means.
  • a lifting disc can be provided coaxially with the control and switching cams, the lifting disc having a cam which is followed by the roller of a lever and which, through a lifting pawl, raises those followers which are not involved in the selection process out of range of the locking pawl and earns.
  • the switch for the drive also to operate a magnet of which the armature carries a stop pawl which, when the armature is attracted, engages in known manner behind a neb of the follower when the latter is in the operating position.
  • the followers are thus arrested electromagnetically, so that any current failure or any changes in the circuit necessarily return the apparatus to the rest position and simultaneously disconnect it, so that normal telephone operation cannot be disturbed.
  • the keys moving the followers preferably have U- shaped recesses which engage projections from the followers.
  • cams can easily be exchanged even by a layman without the operating efiiciency of the apparatus suffering.
  • the cams are changed if the keys are to select different telephone numbers. There are various possible methods of doing this.
  • cams it is desirable, however, for the cams to have a main radial slot with a groove in one side, the groove being arcuate and serving to receive a rotary locking shaft having a flat.
  • the locking shaft has a slot which acts as a keyhole for a key turning the shaft.
  • the keyhole is preferably covered by a plate pivoted by gravity, so that the key and stopping pin can be inserted only when the apparatus is in a specific position.
  • a further operating safeguard consists in providing a send and a relay contact actuated by the handset cradle in the circuit of the magnet and the motor switch respectively to allow the cams to be driven only when the handset has been raised.
  • FIG. 1 is a diagrammatic view of a cam with the support member in the rest position and with the clutch through which the impulses are transmitted;
  • FIG. 2 is a diagrammatic front elevation of the clutch with the corresponding working and rest contacts for transmitting series of impulses
  • FIG. 3 is a side elevation of a section along the line FF in FIG. 2;
  • FIG. 4 is a section along the line GG in FIG. 2;
  • FIG. 5 is a diagrammatic View of the control roller with the locking shaft at the side from which the latter is turned;
  • FIG. 6 is a side elevation of FIG. 5 along the line AA;
  • FIG. 7 is a section along the line B-B in FIG. 5;
  • FIG. 8 is a section along the line C-C in FIG. 5;
  • FIG. 9 is a section along the line DD in FIG. 5;
  • FIG. 10 is a section along the line E--E in FIG. 5, and
  • FIG. 11 shows a stamped cam with raised and lowered portions for transmitting series of impulses.
  • the housing and the keys mounted therein are constructed as described in German Patent No. 1,034,218.
  • FIG. 1 shows the control shaft 1, which carries with it a cam 2 in the direction of the arrow 3 without relative rotation.
  • the cam as shown inv FIG. 11, has raised portions 4 and recesses 5 which determine the impulsesequence of the impulses and of the numbers dialled.
  • the cam 2 is monitored by a cam follower member 6 when the latter is in the operating condition. In the position shown, movement of the follower in the direction of the arrow 7 would bring the projection 8 of the follower into a groove 9 in a locking pawl 10 but would not move the locking pawl.
  • the neb 11 of the follower which neb is reciprocated by successive contact with the raised portions 4 and recesses 5, does not produce any movement of the locking pawl.
  • the cams 2 and followers 6, together with the corresponding number of keys are arranged one behind the other perpendicularly to the plane of FIG. 1 at a spacing such as is shown, for example, in FIG. 5.
  • a lifting cam disc 12 and switching disc 13, to be described below, are however associated with all the followers in common.
  • the follower At the side facing the carn, the follower has a neb 21, a recess 22 and a neb 23.
  • a spring 24 endeavours to draw the follower 6 in the opposite direction to the arrow 18.
  • the recess 22 which is positively engaged by a pawl 25, pivots the latter about its fulcrum. 26 in the direction of the arrow 27, so that it operates the actuating pin 28 of the motor and magnet switch 29.
  • This switch connects the drive (not shown) for the shaft 1 and also the magnet 30, the armature 31 of which pivots the stop pawl 32 about its fulcrum 33 so that it comes to rest behind the neb 23.
  • the follower 6 is thus arrested in its operating position.
  • the neb of the disc 13 pivots a large angle lever, to the other end of which the motor and magnet switch 253 is fixed. This brings the switch out of the range of the switching pawl 25.
  • the switch 29 therefore opens and cuts oif the energisation of the electromagnet 36.
  • the follower 6 is now freed and moves opposite to the direction of the arrow 18.
  • a spring 47 pivots the check lever 46, since the pawl turns anticlockwise. This brings the projection 48 into contact with the recess 49 in the disc 13.
  • the system which is movable as a unit is thus arrested again in the correct starting position for the next switching step.
  • the lifting cam disc 12 When the shaft 1 moves in the direction of the arrow 3, the lifting cam disc 12 also rotates and, when an associated follower roller 56 has moved up to the surface 51 on the disc 12, the lifting pawl 52 then pivots about its fulcrum 53, thus bringing all the followers 6 to rest on the pawl 52, together with their cams, out of range of the raised portions 4 of the cam 2.
  • the follower 6 has been moved in the direction of the arrow 18, its recess 21 drops behind the lifting pawl 52, so that the neb it simultaneously passes into range of the raised and recessed portions of the cam 2 and its projection 8 moves under the projection 54 of the locking pawl 16.
  • the angle lever 60 then moves the impulse pawl 62, which is in the form of a lever, about its fulcrum 63 against the tension of the spring 64.
  • one end of the impulse pawl 62 bears on a sharply stepped surface 66 of the locking wheel 67. If the impulse pawl or the end is moved in the direction of the arrow 68 (FIG. 3), then the clutch 69 (shown in its entirety in FIG. 2) can operate, since it is constantly driven through a worm drive 76 by the drive for the shaft 1.
  • the driving shaft 71 urges a friction disc 72, which is fixed to the shaft 71, towards a friction disc (not shown) fixed on the hollow bush 74.
  • the locking wheel 67 and impulse wheel 75 are mounted on the hollow bush against relative rotation.
  • both the locking wheel 67 and the impulse 6 wheel 75 rotate in the same direction as the driving shaft 71.
  • Both the locking wheel and the impulse wheel have recesses which are offset by 120.
  • the locking wheel rising surfaces 77 adjoin sharply stepped surfaces 66, forming lugs, while the impulse wheel has projections 73 which are stepped on both sides.
  • Manufacturing inaccuracy is compensated for, in that it is important only, for example, for the work contact to be closed at some time while the interval contacts are opened an interposed projection 78, thus causing a circuit-break.
  • the work contact must then become active at a range offset by 120 after the interval contact has closed. This considerably simplifies production, since the locking pawl 11 is used only to release the clutch 69 and any inaccuracy in the transference of impulses is compensated for by the enforced neutral position when the impulse pawl 62 locks the locking wheel 67.
  • FIGS. 5 to 11 Possible constructions to make it easy to change the cams are shown in FIGS. 5 to 11. These consist in providing the shaft 1 with flattened portions 81, 82 (FIG. 10) so that a guide member 83 is adapted for insertion in a main slot 84 of the cam 2.
  • the main slot has an arcuate groove 85 which is engaged by a locking shaft 86 when it is turned into the position shown in FIG. 8. If the locking shaft 86 is turned by the key 87 far enough in the direction of the arrow 88 (FIG. 8) for the straight surface 89 to be aligned with the main slot 84, then the cam 2 can be drawn out in the direction of the arrow 96 without any trouble. Correct positioning of the locking shaft 86 both when it is locked, as shown in FIG. 8, and when it is released, is obtained by means of a spring roller 91, which is pressed by an annular spring 2 against an abutting extension 93 attached to the locking shaft 86. This ensures definite engagement in one or other position
  • a cover plate 96 In order to ensure that the cam 2 can only be removed when the apparatus is turned upside down the projection 94 on the locking shaft 86, which is engaged by the slot 95 of the key 87, is covered by a cover plate 96.
  • a keyhole 97 in the cover plate has a slot 98 which is adapted to cooperate with the arresting pin 99 of the key. When the key is in position the pin 99 can rotate the extension 93.
  • Also provided on the housing is a flap 100 which pivots by gravity about its fulcrum 101. In the position shown in FIG. 6 it is impossible to insert the key 87, since the flap 1% covers the keyhole 97. If the apparatus is tilted, for example, in the direction of the arrow 162, then the flap 100 eventually exposes the keyhole, since the cover plate 96 now changes its position in relation to the flap 100.
  • cams 2 can be changed only in a specific operating position. If the apparatus is returned to the normal position without the key being pulled out, then the key cannot be removed, so that in any event the apparatus is ready to operate only if the members are in their structurally correct position. Only when the apparatus is mounted ready to operate does the flap 100 drop back into a position where it exposes the slot 98, and the arresting pin 9 can then be pulled out through the slot.
  • the invention can be applied to all cases where a pulsing device, ready to operate and functioning efficiently, is to be made with low production costs and little expenditure on adjustment.
  • Pulse transmitter for telephones comprising: at
  • Pulse transmitter for telephones comprising: at least two rotatable cams; means for driving said cams; a follower member for each of said cam-s, normally kept out of the range of its respective associated cam; a common locking pawl actuated by said follower members in synchronism with cam action thereupon; a key associated and engaged with each of said follower members for selectively placing said associated follower members in the actuating ranges of its associated cam and of said locking pawl; means actuated in synchronism with selection of a follower member for retaining said follower member after selection thereof in said actuating ranges of said cam and of said locking pawl; means actuated in synchronism with said cams for removing said selected follower member from said actuating ranges; a pulse wheel and a locking wheel mounted for rotation in unison; means for disengageably, drivingly connecting said two wheels to said driving means; contact means individually actuated by said wheel; and a pawl linked to said locking pawl and engaging and
  • Pulse transmitter for telephones comprising: at least two rotatable cams; means for driving said cams; a follower member for each of said cams, normally kept out of the range of its respective associated cam; a common locking pawl actuated by said follower members in synchronism with cam action thereupon; a key engaged with each of said follower members for selectively placing said engaged follower member into the actuating ranges of its associated cam and of said locking pawl; means actuated in synchronism with selection of said follower member for retaining said follower member after selection thereof in said actuating ranges of said cam and of said locking pawl; means actuated in synchronism with said cams for removing said selected follower member from said actuating ranges; a pulse wheel and a locking wheel mounted for rotation in unison; means for disengageably, drivingly connecting said two wheels to said driving means; contact means individually actuated by said wheels; a double arm lever having one arm selectively engaging and disengaging said locking wheel so as
  • Pulse transmitter for telephones comprising: at least two rotatable cams; means for driving said cams; a follower member for each of said cams, normally kept out of the range of its respective associated cam; a common locking pawl actuated by said follower members in synchronism with cam action thereupon; a key engaged with each of said follower members for selectively placing said engaged follower member into the actuating ranges of its associated cam and of said locking pawl; means actuated in synchronism with selection of a follower memher for retaining said follower member after selection thereof in said actuating ranges of said cam and of said locking pawl; means actuated in synchronism with said cams for removing said selected follower member from said actuating ranges; a pulse wheel and a locking wheel mounted on a hollow shaft; a second shaft receiving said hollow shaft and being geared to said driving means, there being means including spring and friction means for drivingly engaging said hollow shaft with said second shaft; contact means individually actuated by said
  • Pulse transmitter for telephones comprising: at least two rotatable cams; means for driving said cams; a follower member for each of said cams, normally kept out of the range of its respective associated cam; a common locking pawl actuated by said follower members in synchronism with cam action thereupon; a key engaged with each of said follower members for selectively placing said engaged follower member into the actuating ranges of its associated cam and of said locking pawl; means actuated in synchronism with selection of a follower memher for retaining said follower member after selection thereof, in said actuating ranges of said cam and of said locking pawl; means actuated in synchronism with said cams for removing said selected follower member from said actuating ranges; a locking wheel having gradually sloping cam surfaces respectively succeeded along the circumference thereof by sharply dropping flanks; a pulse wheel connected to said locking wheel and mounted for rotation in unison therewith; means for drivingly engaging said driving means with said two wheels; contact
  • Pulse transmitter for telephones comprising: at least two rotatable cams; means for driving said cams; a follower member for each of said cams, normally kept out of the range of its respective associated cam; a common locking pawl actuated by said follower members in synchronism with cam action thereupon; a key engaged with each of said follower members for selectively placing said engaged follower members into the actuating ranges of its associated cam and of said locking pawl; means actuated in synchronism with selection of a follower member for retaining said follower member after selection thereof in said actuating ranges of said cam and of said locking pawl; a stop lever for arresting any of said cams in a preselected position and being engageable with said selected follower member for moving out of the arresting position; switch means governing said driving means and being actuated by said stop lever; means actuated in synchronism with the rotation of said cams for removing said selected follower member from said actuating ranges of said cam and of said
  • Pulse transmitter for telephones comprising: at least two rotatable cams; means for driving said earns; a follower member for each of said cams, normally kept out of the range of its respective associated cam; a common locking pawl actuated by said follower members in synchronism with cam action thereupon; a key engaged with each of said follower members for selectively placing said engaged follower member into the actuating ranges of its associated cam and of said locking pawl; means including a lifting disc rotating with said cams and further including a lifting pawl actuated by said disc for placing any non-selected follower member out of the ranges of its associated cam and of said locking pawl upon rotation of said cams; means actuated in synchronism with selection of a follower member for retaining said follower member after selection thereof in said actuating ranges of said cam and of said locking pawl; means actuated in synchronism with said cams for removing said selected follower member from said actuating ranges of said cam and of
  • Pulse transmitter for telephones comprising: at least two rotatable cams; means for driving said cams; a follower member for each of said cams, normally kept out of the range of its respective associated cam; a common locking pawl actuated by said follower members in synchronism with cam action thereupon; a key engaged with each of said follower members for selectively placing said engaged follower member into the actuating ranges of its associated cam and of said locking pawl; magnet means for retaining said selected follower member in said ranges; switch means governing said driving means and said magnet means and being actuated by said selected follower member; means actuated in synchronism with said cams for removing said selected follower member from said actuating ranges of said cam and of said locking pawl; a rotatable pulse wheel; a first contact actuated by said pulse wheel; a rotatable locking wheel;
  • Pulse transmitter for telephones comprising: a main shaft; means for driving said shaft; at least two cams, each having a slot for mounting on said shaft, each slot having an arcuate groove; a locking shaft extending parallel to said main shaft, projecting through said slots and locking said cams to said main shaft when projecting into said arcuated groove; a follower member for each of said cams, normally kept out of the range of its respective associated cam; a common locking pawl actuated by said follower members in synchronism with cam action thereupon; a key engaged with each of said follower members for selectively placing said engaged follower member into the actuating ranges of its associated cam and of said locking pawl; means actuated in synchronism with selection of a follower member for retaining said follower member after selection thereof in said actuating ranges of said cam and of said locking pawl; means actuated in synchronism with said cams for removing said selected follower member from said actuating ranges; a rotatable pulse

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Transmission Devices (AREA)
  • Telephone Set Structure (AREA)
  • Mobile Radio Communication Systems (AREA)
US216137A 1962-02-20 1962-08-10 Current impulse transmitter Expired - Lifetime US3153704A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET21626A DE1151027B (de) 1962-02-20 1962-02-20 Stromstosssender fuer Fernsprechanlagen

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US3153704A true US3153704A (en) 1964-10-20

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US216137A Expired - Lifetime US3153704A (en) 1962-02-20 1962-08-10 Current impulse transmitter

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US (1) US3153704A (da)
BE (1) BE622730A (da)
DE (1) DE1151027B (da)
GB (1) GB1011153A (da)
LU (1) LU42113A1 (da)
NL (1) NL281983A (da)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2386486A (en) * 1941-08-20 1945-10-09 Bell Telephone Labor Inc Call transmitter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2386486A (en) * 1941-08-20 1945-10-09 Bell Telephone Labor Inc Call transmitter

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BE622730A (da)
GB1011153A (en) 1965-11-24
NL281983A (da)
DE1151027B (de) 1963-07-04
LU42113A1 (da) 1962-09-24

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