US2276514A - Impulse transmitting device - Google Patents

Impulse transmitting device Download PDF

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Publication number
US2276514A
US2276514A US289949A US28994939A US2276514A US 2276514 A US2276514 A US 2276514A US 289949 A US289949 A US 289949A US 28994939 A US28994939 A US 28994939A US 2276514 A US2276514 A US 2276514A
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United States
Prior art keywords
wheel
impulse
arm
discs
rocking member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US289949A
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English (en)
Inventor
Puckette Charles Clarke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Company PLC
Original Assignee
General Electric Company PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Company PLC filed Critical General Electric Company PLC
Application granted granted Critical
Publication of US2276514A publication Critical patent/US2276514A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
    • H04M1/34—Lost-motion or other arrangements for ensuring a pause between successive digit transmissions

Definitions

  • the invention relates to impulse sending devices of the type provided on telephone subscribers instruments and operates by rotating a disc by a finger or the like, and the invention has for its object the provision of improvements in connection with the impulse producing portions of the mechanism.
  • impulses are sent out during the return motion of the finger plate to normal, each impulse train being preceded by a period corresponding approximately to the length of two complete impulses. This i known as the lost motion period, and is for the purpose of providing time for certain switching operations to be performed at the exchange.
  • an impulse sender of the type used in telephone systems comprises a toothed impulse sending wheel connected to a finger plate, and acting upon a rocking member rotatable on a pivot which is itself guided so as to move substantially radially relatively to the impulse wheel, the said rocking member acting upon impulse producing contacts during the return motion only of the finger plate to normal.
  • the toothed wheel is provided With a felt washer of a diameter slightly greater than that of the root circle of the impulse producing teeth, this washer being fixed to the Wheel and containing 1ubricant for the impulse producing rocker.
  • dust is excluded from. the inside of the mechanism by providing one: or more. discs of material. such as synthetic resin, these discs being an accurate fit on the shaft carrying the finger plate, and being placed between two or more further discs of similar material fixed to the finger plate itself, each of the latter discs having a hole considerably larger than the said shaft.
  • the impulse sending device is provided with a toothed impulse producing wheel fixed to a shaft carrying the finger plate.
  • the teeth of this wheel act upon a spur of a rocking member during the wind-up motion of the sender, rotating the said member on a pivot which is fixed to an arm.
  • This arm is pivoted at its other end to the frame of the sender, and is rotated through an angle in order to allow the spur and rocking member to be rotated to a limited degree by the teeth of the impulse producing wheel at the commencement of the wind-up period.
  • the pivot of the rocking member may be carried by a fiat spring tensioned so as to hold the member in contact with the wheel, a tongue of the spring being adopted to retain the rocking member in either of its extreme positions.
  • a washer of felt or similar porous material is fixed by means of a springy disc to the toothed wheel and is provided with a quantity of oil by which the impulse producing members are lubricated. This material also acts as a sound deadener.
  • a dust sealing washer of the type already described is provided in connection with the shaft of the device,,the, object beingv to permit a certain amount of adjustment to the number plate of the dial during assembly, relative to the central shaft, without causing gaps to appear around ing member is carried by the teeth. in. a backward the shaft through which dust could obtain access to the interior of the impulse sender.
  • Figure 1 is a rear view of an impulse sending device or dial as used by telephone subscribers
  • Figure 2 is a section of the device, and Figures 3 and 4 show the impulse producing portion of the dial. in particular positions to be described later, and Figure 5 is an enlarged view of one form of the rocking member.
  • the impulse sender comprises a toothed impulse producing wheel I, mounted on a shaft 2, this shaft being rotated by the subscriber by means of a finger plate 3, in normal manner.
  • the shaft bears a sprocket wheel 5, which drives a further gear (not shown) engaging with the worm 4 which is. mounted. on the same shaft as the fiy-weights 6, formingpart of a normal type of governor mechanism.
  • the shaft 2 also carries an arm. I which engages in a normal position with the contact springs l0, these performing off-normal circuit functions when the dial is wound up.
  • the toothed wheel I engages with the spur 4! of a rocking member II when the Wheel is rotated, this rocking member being pivoted at l 3 on the; arm 12, this arm itself being pivoted at M so as to have a limited degree of rotation.
  • the dial is rotated in a winding up direction, the first tooth I of the wheel I engages the spur of the rocking member I I, turning it to the position shown on Figure 3.
  • the spur of the member H is merely a continuation of the pin I6, which carries an insulating collar I8, the purpose of which will be explained later.
  • the extent of movement of the arm I2 is controlled by the engagement of a projection on it with the slot 40, the projection normally resting on the end of the slot nearest the centre of the dial.
  • the arm and. projection only leave this position during the initial movement of the rocking member from the position shown in Figure 1 to that shown in Figure 3 at the commencement of the winding-up period, and also during the initial part of the reverse movement of the dial, prior to impulse sending.
  • the spur of the rocking member II rests in a space between two teeth of the wheel I.
  • a tooth catches the spur, and rotates the rocking member II through a considerable angle to approximately the position shown in Figure 4, the radial movement of the pivoted end of the rocking member being permitted by the rotation of the arm I2 about its pivot I4.
  • the arm I2 once more reaches the extent of its travel inwards, and a slight further movement of the wheel I in a return direction causes engagement of a tooth of the wheel with the spur 4
  • the collar I8 engages with one spring of the contact set 22, opening the contacts while the tooth 23 passes underneath the spur. After the tooth has passed, the springs 20 and 22 cause the spur to drop into the space between the teeth, with the result that the impulse springs 22 reclose.
  • an impulse has been sent, the length of which, and the spacing between it and successive impulses, is determined by the shape and dimensions ofthe teeth of the wheel I.
  • a period of lost motion has been provided at the commencement of the impulse train, this period being prefixed to any digit dialled by the subscriber.
  • the pivot I3 may be carried by a flat spring similar to 20, tensioned so as to hold the rocking member in contact with the impulse producing wheel, a tongue of the spring being adapted to retain the rocking member in either of its extreme positions in a manner similar to that described in connection with the cam shaped face of the rocking member itself.
  • the spring 20 and the profile of the rocker I I may be retained, and the pivot I3 may be given a truly radial movement either by a straight line motion linkage, or by mounting it on a slide engaging with a slot formed in the body of the dial.
  • a disc 25 of felt In order to prevent noise and wear, we arrange to provide a disc 25 of felt, this disc being held against the impulse producing wheel I by means of a dished spring 26.
  • This felt disc has a diameter slightly greater than that of the root circle of the teeth, with the result that the spur of the rocker, in falling from the crests of the teeth, encounters a soft surface, this reducing noise.
  • the disc is impregnated with a suitable lubricant, such as a thin oil, this reducing frictional wear on the spur and teeth and helping to maintain the pivots of the device in a lubricated condition.
  • a dial usually consists of a base 21 containing the governor and gearing (not shown), these gears being enclosed in a space covered by the number plate 28.
  • this plate does not make a very good joint either at its periphery or at the edge of the hole in its centre, we arrange a disc of felt 30 beneath the plate, this felt resting on a ledge 29 formed on the base of the instrument. The number plate rests on this felt and is held in place by a wire ring 3
  • a dust sealing device is also employed to ensure that dust is excluded from the gap normally existing between the spindle of the dial and the inner edge ofthe hole in the number plate through which the spindle passes.
  • One or more discs 33 are mounted on the central shaft 35 of the dial, these discs having holes in their centres which are only very slightly greater than the diameter of the member 35.
  • the outer edges of these discs are enclosed between further discs 34, these discs having holes in their centres appreciably larger than the diameter of the member 35 and overlapping the edges of the hole formed in the plate 28. All these discs are preferably made of some thin sheet material, such as that producible from synthetic resin, and the outer discs 34 are fastened together and to the plate 28 by means of clips 36.
  • a collar 39 of felt or similar material is provided on the pin I3 inside the pivoted end of the rocking member II.
  • This collar is impregnated with oil, and stands just proud of the centre of the cam-surface of the member II, this acting to lubricate the spring 20 and the cam surface.
  • a similar felt collar can be provided in connection with the bearing I4.
  • An impulse sender having a finger plate and a toothed impulse sending wheel connected thereto and rotated therewith, impulse producing contacts, a pivoted rocker arm, a rocking member pivoted on said rocker arm so that the pivoted end of the member has radial movement relative to said wheel, said member moved with its pivot point by forward rotation of said wheel without operating said contacts and moved about its pivot point by the return of the wheel to operate said contacts.
  • An impulse sender as claimed in claim 1 having a pivoted arm having said rocking member pivoted to the movable member of said arm so that the pivoted end of the member has movement about the pivot point of the arm.
  • An impulse sender as claimed in claim 4 in which said arm carries a collar of insulating material on its free end engaging the wheel, said collar removed from engagement with said contact springs on the forward movement of the wheel and engaged and operated by the teeth of the wheel on the back movement thereof to operate said springs.
  • impulse contacts a pivoted arm, a rocking member'pivoted to the free end of said arm and having one end engaging the surface of said wheel, said member and arm having radial movement about the pivot point of said arm toward and away from said wheel and movable backward and forward with the wheel in its initial forward and its initial backward movement, said member moved about its pivot by said wheel on the latter part of its backward movement to engage and operate said contacts.
  • An impulse sender having a finger hole dial and a toothed impulse wheel secured thereto and rotating therewith backward and forward, impulse springs, a rocker arm for controlling said springs pivoted on a movable member adjacent said wheels so that its pivot point has a limited radial movement relative said wheel, said rocker arm moved in one direction with the wheel on the forward movement thereof and back to its initial position on the first part of the backward movement thereof, said member on the remaining backward movement operated by the teeth of said wheel in a movement to operate said springs intermittently.
  • An impulse sender as claimed in claim 1 having means for excluding dust from its interior comprising a series of thin disc washers closely mounted on the shaft of the finger wheel and other thin discs mounted in the device on stationary parts thereof, the first disc slidable between the other discs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Transmission Devices (AREA)
  • Telephone Set Structure (AREA)
US289949A 1938-08-27 1939-08-14 Impulse transmitting device Expired - Lifetime US2276514A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB25188/38A GB518721A (en) 1938-08-27 1938-08-27 Improvements in impulse senders of the type used in telephone systems

Publications (1)

Publication Number Publication Date
US2276514A true US2276514A (en) 1942-03-17

Family

ID=10223660

Family Applications (1)

Application Number Title Priority Date Filing Date
US289949A Expired - Lifetime US2276514A (en) 1938-08-27 1939-08-14 Impulse transmitting device

Country Status (3)

Country Link
US (1) US2276514A (enrdf_load_stackoverflow)
BE (1) BE436177A (enrdf_load_stackoverflow)
GB (1) GB518721A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2522004A (en) * 1947-12-24 1950-09-12 Telephonics Corp Electric impulse transmitter pawl silencer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2522004A (en) * 1947-12-24 1950-09-12 Telephonics Corp Electric impulse transmitter pawl silencer

Also Published As

Publication number Publication date
GB518721A (en) 1940-03-06
BE436177A (enrdf_load_stackoverflow) 1939-09-30

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