US1293545A - Calling device. - Google Patents

Description

0. E. RASMUSSEN.

CALLING DEVICE.

.APPLICATION FILED JULY 24.1917.

1,293,545. I Patented Feb. 4, 1919.

bi l/@1172) 7 Us vw/a If Rasmussen description.

.OSVALD E. RASMUSSEN, or wEs'r HOBOKEN, NEW JERSEY, nssrsnon To wnsrnruv ELECTRIC comrnnznrcoaroaernn, or NEW YORK, N. Y., A oonroaa'rron or NEW YORK.

Hudson and State of New J ersey, have invented certain new and useful Improvements in Calling Devices, of which the. following is a. full, c1ear,.concise, and exact .This invention relates to calling devices,

. and more particularly to calling devices for automatic and semiautomatic telephone systems.

of the calling device cannot be operated a An ob'ect of this invention is to provide an improved arrangement, whereby the dial second' time until the transmission'of impulses resulting from a previous actuatlon of the dialhas been completed. 1

Another object of this invention is the provision of improved means 3 for hiding during the transmission of the impulses,

the symbols normally'visible through the I finger holes ofthe dial.

it In general, the calling device embodying the present invention consists of means for permitting the dial to rotate backward a small portion of its forward rotation, and

; nism, and for locking thedial against further rotation in either direction during the 1 Operation of the impulse mechanism. The

dial is locked in such a position that the symbols normally seen through the finger holes ofthe dial are hidden by the portion of the dial between adjacent finger holes.

- v The drawing showsa perspective view of the sender withits case removed so that the operating parts of the mechanism may be moreclearly disclosed. The sender 1s provid ed with the shaft 10, rotatably mounted in thebottomjof the case (not shown). A finger dial 11 is fastened to the upper end of this shaft and has holes whereby it may bejoperated. Normally, these holes are directly above symbols on astationa-ry plate '12, which is fastened to thecase in any suitable manner. This plate also servesas the upper support of the shaft 10. The

- toothed wheel 1 is fastened to the lower end of. the shaft 10.

One end of a coil s ri gs is fastened. to

Specification of Letters Patent.

speed of rotation of said wheel. stationary plate 12 and the impulse wheel 1 wheel 6.

CALLING DEVICE.

Patented Feb. 4, 18 19.

Application filed July 24, 1917. Serial No. 182,489.

the wheel 1, and the other end is fastened to a pin 14 mounted upon an impulse wheel .6. This impulse wheel is loose on the shaft 10 and carries a plurality of upwardly pr0- jecting pins 15, which are arranged to engage the contact spring 16 during rotation of the wheel, and thereby open the contact between springs 16 and 17. The wheel 6 is normally prevented from rotating by a dog 7 which is carriedby a lever 8, pivoted in the bottom of the case by screw 30. The

wheel 6 meshes with pinion 18 which may be connected by means of'the shaft 19 to any well-known type of governor to control the Between 6 a hub cam t -is mounted upon the shaft '10. -This cam is arranged to move longitudinally on the shaft, but rotates therewith. A spring 22 normally holds a cam portion20 of the hub-cam in a groove of a sleeve 21, which is fastened to the impulse The hub oam has a flange 24.- which engages one end of a bell crank lever 5, which is pivotally mounted on a projection 13 ofthe plate 12. v The other end of the bell crank lever engages one end of the of the lever 8 and thereby rock the lever about its pivot 30.- The otherend ofthe Y lever 25 controls a pawl 3 which is in operative relation to the toothed wheel 1. A spring 28 is fastened to the projection 29 of the lever 8 and to the case (not shown) in such a manner that its line of action may be changed from one side of the pivot 30 to the other side by the movement of the lever 8 so as to hold the lever 8 in whatever position it is moved. v

,The operation of the device is as follows:

Movement of the dial 11 in a clockwise direction through an angle corresponding to-the digit selected, moves the shaft 10 and the toothed wheel 1, and also places the spring 2 ward due to the tension of the spring 2, but i as soon as'a tooth of the wheel engages the pawl 3 it rocks the lever 8 about its pivot point 30. This movement of the lever 8 moves the projection 9 into engagement with the toothed wheel and prevents further rotation thereof. This movement of the lever 8 also removes the dog 7 out of engagement with the impulse Wheel 6, which is now free to move under the influence of'the'spr'ing 2 and the governor (not shown) attached to the shaft 19. This slight backward movement of the dial 11, produced before the toothed wheel 1 is locked, is suflicient to move the dial so that the portionsther'eof, which are between the finger holes, cover-up the symbols" on the'stationar'y' plate 12. In this way the symbols remain covered up until the toothed wheel 1 is released. When the impulsewheel 6 has been rotated in" a clockwise direction and has produced the predetermined number of impulses in the circuit through the contaotjsprings- 16-- and I 17; thegroove ofthesleev'e 21 will be brought back into engagement with the cam 20 of the hub cam 4. This groove of the sleeve-21 is 50- arranged that the cam 20 will drop down intoit before the spring 2- hastransmitted all-the energy that was stored up in it by the clockwise rotati'on of the dial: As soon as the cam 20"drops down into the groove the bell'crank levers is moved'back intoits normal position. Thisymovement of thebell'c'rank lever rocksthe lever 8, which moves the dog ]7 intoen'gage'ment with the impulse wheel 6', and thereby stops -itfrom further rotation. Itwill, therefore, be seen that the impulse wheel 6 is stopped rotating before cam'20 has reached its normal'position in thegroove of the sleeve 21; Since the movement of the lever 8' also r'emovesdog 9 from engagement with thetoothed wheel 1 andthe return movement of the bell crank lever 5 moves the lever 25-so as to withdraw pawl 3 from engagement with the wheel 1, this wheel 1 is free to rotate. The energy, which is still left in the coilspring 2, will, therefore, rotate this wheel 1 counter-clock wise the slight amount necessary for the cam 20'to assume its normal position. This slight 'rotation of the toothed wheel issuflic'i'ent,

however, to move'the dialso that the; symbols are again, visible through the finger holes. All parts ofthe sender are now in their-normal positions and the sender is in position for a subsequent operation.

Vvhat is claimed is: y 1. In a calling device. a rotatable dial having finger holes, a stationary member carrying symbols normally visible through operation of said said finger holes, an impulsetransmitting mechanism, means for operating-said mechanism, and means for locking said dial in a position to hide said symbols during the impulse transmitting mechanism. v

.2...In a calling device, 'a' rotatable dial having finger holes, a stationary member carrying symbols normally visible a, through said finger holes, p, an impulse transmitting mechanism, ineansfor operating said mechanism, means for locking said dial in aposition to hide said symbols-during the. operation of said impulse transmitting mechanism, andmeans operated at the end of the operation: of said mechanism for releasing. said dial" and moving it into a position in which said symbol-s are visible through's'aid finger hole's'.. V

3. In a calling device, a rotatabledial'having finger holes, a stationary member may in g symbols normally visible through said finger holes, an impulse wheel, means for rotating said impulse wheel in acoordanc'e with the forward rotation of said dial, means, for rotating said diamiackward a small portion ofits' forward rotation, and

4. In a calling device, a rotatable'dial hav ing finger holesya stationary member carr ing symbols normally visible through said finger holes, an impulse wheel, mean -for rotating said impulse wheel in" accordance with the forwaramtation of said dial,"

means for rotating said aialxbackwara a small portion of "its fo ward rotation, means operated by said backwirrd movement for releasing said/wheel and forloelnn --said dial in a position to'hicle said symbo 's-dun ingthe movement. ofth'e' wheel, and means operated at the end. of the operation of said wheel for moving said dial into a position in which said symbols are visible through said finger holes.

5. In a calling device, a rotatable dial; an impulse wheel, means for rotating the impulse wheel in-acc'ordance with the forward rotation of said clial, means for locking the wheel against rotation during the forward rotation ofthe dial, means for rotating said dialjbackward a small portion-ofits forward rotation when said dial is-'relea'sed and means operated by said. backward rotation for releasing said impulsejwheel' and 'forlocking saiddial against rotation in" either direction during-the movement ofsaid wheel.

6. In a calling; device, a dial, an impulse wheel, connecting means betweenthennwheel'a distance each time in response tofthe forward rotation of the dial, meansfor looking the impulse wheel against-rotation, and

pulse wheel and the dial for rotating the means controlled by the dial for releasing the impulse wheel and for locking said dial against rotation in either direction during the movement of said wheel.

7 In a calling device, an impulse transmitting mechanism, a rotatable dial for operating said mechanism, means for permitting the dial to rotate backward only a portion of its forward rotation, and means operated by said backward rotation of the dial for causingthe said mechanism to transmit impulses and forlocking said dial against rotation in either direction during said operation of the mechanism.

8. In a calling device, a rotatable dial, an impulse wheel, means for rotating said wheel, means for normally locking said wheel against rotation, and means operated by a slightly backward rotation of said dial after a forward rotation for releasing said impulse wheel and for locking said dial against rotation in either direction during said movement of the wheel.

9. In a calling device, a rotatable dial having finger holes, a stationary member carrying symbols normally visible through said finger holes, an impulse wheel, means for normally locking said Wheel against rotation, means for rotating said wheel in accordance with the forward rotation of said wheel, means for rotating said wheel backward a small portion of its forward rotation when said dial is released, and means operated by said limited backward rotation for releasing said wheel, for locking said dial against rotation and for hiding said symbols from View during the movement of said wheel.

In witness whereof, I hereunto subscribe my name this 20th day of July, A. D., 1917.

OSVALD E. RASMUSSEN.

Copies otthis patent may be obtained (or five cents each, by addressing the flommissioner or Pateata, Washington. n. G."

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