US1932647A - Telephone instrument - Google Patents

Telephone instrument Download PDF

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Publication number
US1932647A
US1932647A US400402A US40040229A US1932647A US 1932647 A US1932647 A US 1932647A US 400402 A US400402 A US 400402A US 40040229 A US40040229 A US 40040229A US 1932647 A US1932647 A US 1932647A
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United States
Prior art keywords
instrument
keys
springs
operating
subscriber
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
Application number
US400402A
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English (en)
Inventor
Stehlik Rudolph Frank
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.)
Associated Telephone and Telegraph Co
Original Assignee
Associated Telephone and Telegraph Co
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 Associated Telephone and Telegraph Co filed Critical Associated Telephone and Telegraph Co
Application granted granted Critical
Publication of US1932647A publication Critical patent/US1932647A/en
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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
    • H04M1/02—Constructional features of telephone sets

Definitions

  • the present invention relates to improvements in or relating to telephone substation instruments and circuits associated therewith and while it more particularly is concerned with a special instrument for use in connection with diiierent kinds of systems such as systems in which it is possible to talk on two or three different systems from the same instrument or systems in which interworking is provided hetween 2.
  • Fig. 1 represents diagrammatically the circuit arrangements by which the subscribers instrument, which is an automatic instrument, that is an instrument provided with an impulse sender, may be used for calls in an office system or for calls to the main exchange; while Fig. 2 represents diagrammatically the circuit arrangements of a main instrument and an extension instrument Hr" no both of the automatic type, Fig. 3 shows the instrument in side elevation with part of the cover open so as to show a side view of the button and springs for connecting with main exchange lines.
  • This apparatus is shown in greater detail in Figs. 4, 5, 6 and '7, Fig. 1 showing' a view looking in the direction of the arrow A in Fig. 3 with the cover removed.
  • Fig. 5 shows a side elevation of Fig.
  • Fig 6 shows a view of the buttons in normal position lookingin the direction of the arrows B from the line CD of Fig. 4;
  • Fig. 7 shows a view of the buttons with the main exchange button operated looking in the direction of the arrows E from the line F-G of Fig. 4.
  • Fig. 1 In this figure, 10, 11 represent the exchange line and 12,13 the local line. It should be understood of course that while reference is made to exchange and local lines, two different exchange lines or two different local lines could be employed instead of one of each.
  • 14 represents the bell for the local line and 15 the condenser in series therewith.
  • 16 represents the bell for. the main exchange line and 17 the condenser in series therewith so that by ringing separate bells or operating other suitable signalling apparatus a subscriber can be informed as to which line he is being called on.
  • FIG. 2 shows an arrangement according to the invention whereby calls incoming from a public exchange can be dealt with either from a main instrument or an extension instrument and in which facilities are provided to enable the main and extension instrument subscribers 'to communicate independently of the exchange line.
  • L represent the main exchange lines
  • EB and LB represent the exchange button and the local button which control the springs shown immediately above the references.
  • the instrument circuits shown are antiside-tone circuits provided with dial switches for establishing connections in an automatic telephone exchange but it will be understood that these circuits can be varied as they do not form any part of the present in-- vention.
  • buttons EB and LB previously mentioned and also with switchhook springs SS, a buzzer B and a battery C.
  • switchhook springs SS switchhook springs SS
  • buzzer B a buzzer B
  • battery C a battery of the electric device.
  • interlocking levers controlled by the exchange button and the local button which operate in such a way that if either of the buttons is depressed when the other button is depressed the switching springs marked S are restored.
  • the spring marked H remains operated, however. when once depressed and can only be restored when the receiver is replaced on the switchhook. This also replaces whichever of the two buttons is depressed and restores conditions to normal.
  • buttons provided are a call button CB and a non-locking button NLB.
  • the call button GB is operated when the extension subscriber either receives or initiates a call and remains operated as long as the receiver is kept off the switchhook.
  • a call is received over the lines L, L when it will be noted that current can flow over the bell and condenser BM and CM at the main instrument and also over the contact springs S of the buttons EB and LB respectively to the bell BE and condenser CE of the extension instrument. It is not necessary that both instruments should be provided with bells.
  • the spring I-I remains operated and completes a short circuit across the lines L, L to hold the exchange line.
  • the depression of the upper spring S of the button LB completes a circuit for the extension buzzer BZ over the lines L4 and L1 and through the upper normally closed contact of the switchhook springs at the extension instrument.
  • the buzzer thereupon operates and signals the extension subscriber who answers by lifting the receiver thereby operating his switchhook springs and by depressing the call button key CB.
  • the main exchange subscriber can either converse with him informing him who wants him and restoring his receiver or else he can immediately restore his receiver.
  • the extension instrument subscriber had first answered he would simply have lifted his receiver and depressed the button CB, when he could have carried on conversation. If the extension subscriber should have found that the call was for the main instrument subscriber, then he would press the non-locking button NLB thereby completing a circuit over the lines L1 and L3 in series with the battery in line L3 and the upper switchhook springs SS of the main instrument. The buzzer B would therefore operate and call the main instrument subscriber who would thereupon lift his receiver and depress the main exchange button and thereby take up the call from the exchange.
  • the buzzer B would be operated both in the case where the extension instrument requires to call the main instrument for an exchange call and in the case where the extension instrument requires to call the main instrument for a purely local call, a distinction would require to be made by operating the buzzer according to a pre-arranged code, as in the case of a local call the main instrument subscriber would then press the local button which if done in the case of an exchange call would break down the connection as the trunk button would not have previously been pressed.
  • buttons ME and LE of which only ME is visible in Fig. 3.
  • These buttons are arrangedon the cover in which the dial switch may also be fitted. However in the drawings the dial switch has been omitted for the purpose of clearness.
  • Extending through the cradle containing the contact springs is a stem 51, which rises when the hand-telephone is removed frcm the cradle to release the button 59 and so permits the restoring lever 52 to be operated freely and allow the buttons ME and LE to be operated.
  • the operation of these buttons and the parts they control will be better understood by referring to Figs. 4, 5, 6 and 7.
  • each button consists of a rod 53 passing through a nut 54, a boss 55 externally threaded and a hole in a frame 55 and termimates in a flange portion 5'7 for engaging with the spring operating plates 58 and 59.
  • the main exchange button is effective to operate the plates 58 and 59, while the local exchange button is adapted to operate the plate 60 as will be described later.
  • the nut 54 screws on the boss 55 and serves to secure the frame 56 and the parts secured thereto to the cover.
  • Fig. 5 the cover is omitted for the sake of clearness.
  • the frame 56 is better seen in Figs. 4 and 5 and it will be noted that it serves to support a number of contact springs which correspond to the springs shown in Fig. 1 and for that purpose the moving springs 27, 28 and 29 are shown with the same reference characters.
  • the springs 28 and 29 operate in all cases together, they are shown linked by a single insulation 61 and the spring 29 is provided with a curved portion 62 at its upper end for engaging with the cam surface of the spring engaging member 58.
  • the spring 27 is similarly provided with a cam surface 63 for the purpose of engaging with the cam surface of the spring engaging member 59.
  • the spring engaging mem bers 58 and 59 are mounted together with the spring engaging member 69 so as to rotate about the tube 64 secured in position by a screw 65 extending between the upper and lower arm of the U-shaped member 66 which is secured to the bracket 56.
  • the shape ofthese contact engaging members will be best understood by referring to Figs. 6 and '7. In Figs. 6 and '7 it will be noted that the members 58-and 6O abut against one another at their surfaces 6']. They are both pivoted on the same pivot, so that when the button ME is pressed, as shown in Fig. 7, and the contact operating plate 58 moved into the position shown, the contact operating plate 60 will have been moved into a new posi Simition with button LE forced further out.
  • both the plates 58 and 60 are tapered gradually extending towards the centre where they have half their thickness cut away on opposite sides so that they can fit the one over the other in the manner shown.
  • the abutting parts are not cut away so that the abutting surface extends for the full thickness of the plates.
  • the contact operating plate 59 is also pivoted on the tube 64 but only extends on one side of the pivot and is free to move relatively to either of the plates 58 and 60.
  • the cam surface on the plate 59 is similar to the cam surface on the plate 58,150
  • a stop 70' is provided to prevent the plate from moving too far and so allowing the contact springs to restore.
  • a stop 70' is provided to prevent the plate from moving too far and so allowing the contact springs to restore.
  • the lever 52 operated by the rod 51 extending from the button 50 and operated by the hand-telephone, is pivoted on a bar 68.
  • lever 52 has two arms 69 and 70 extending one on each side of the bracket 71 which forms an integral part of the frame 56.
  • the arr 69 extends, as will be seen from Figs. 4 and 7, so as to engage both the contact operating plate 58 and the contact operating plate 59, this engagement being effective to restore the plates to the position shown in Fig. 6, when the hand-telephone is placed on the cradle.
  • the plate 60 is restored to normal by the extension 70 if it should be that this plate is in an off normal position that is, if the button LE in Fig. 5 has been pushed too far forward. It will thus be seen that the effect of estoring the hand-telephone to the cradle is to immediately restore all the contact operating plates to the position shown in Fig. 6.
  • the invention is not limited to the particular construction shown, for instance, the plates 58 and 69 need not be in a line but could be inclined if it was desired to mount the buttons on other than a fiat surface.
  • the circuit need not be exactly that shown in 1, as not only could it be applied to any type of instrument circuit with or without an impulse sender but it could also be applied to magnets or other systems. Instead of a direct short-circuit a retard or an indicator or other electromagnetic operated device could be connected in this circuit to serve the same purpose and possibly an additional purpose.
  • a pair of manually operable devices contacts controlled by said devices, mean onsive to the operation of one of said devices for operating said contacts and responsive to the operation the other of said devices for restoring only certain of said contacts, and independently operable device for restoring the remaining contaots- 2.
  • a pair or keys contacts controlled by said keys, means responsive to the operation of one of said keys for op: erating said contacts, means responsive to the operation of the other of said keys for restoring only certain of said contacts, and independent means for restoring the remaining contacts.
  • pair of manually operable keys contact springs controlled by u said keys, means responsive to the operation of one of said keys for operating all of said contact springs, means responsive to the operation of the other of said keys after said first key has been operated for restoring only certain of said contact springs, a switchhook in said telephone, and means responsive to the operation of said switchhook for restoring the remaining contact springs.
  • a pair of manually operable keys at set of contact springs controlled by said keys, means responsive to the operation of one of said keys for operating said set of contact springs, means responsive to the subsequent operation of the other of said keys for restoring only certain of said set of contact springs, 21. switchhook in said telephone also controlling said contact springs, and means controlled by said switchook responsive to the replacement of the receiver thereon for restoring the remaining or all of said contact springs.
  • a first and a second manually operable key an operating member individual to each key and engaging each other so that the movement of one is de pendent on the movement of the other, another operating member individual to said first key movable independently of said other operating members, contact springs controlled by said operating members, and means responsive to the operation of said keys for moving their individual operating members to variably operate said contact springs.
  • a first and a second manually operable key an operating member individual to each key and engaging each other so that the movement of one is dependent on the movement of the other, another operating member individual to said first key movable independently of said other operating members, contact springs controlled by said operating members, means responsive to the operation of said first key for moving the operating members engaging each other and the other operating member to operate said contact springs,
  • a first and a second manually operable key a pair of operating members individual to said first key, a single operating member individual to said second key, said single and one of said pair of operating members engaging each other, contact springs controlled by said operating members, means responsive to the operation of said first key for moving its pair or" operating members to operate said contact springs, means responsive to the operation of said second key for moving its single operating member. to restore the memher it is in engagement with and release certain of said contact springs, a switchhook also controlling said operating members, and means responsive to the operation of said switchhook for restoring said single operating member to release the remaining contact springs.
  • a pair of manually operable keys an operating member controlled by one of said keys, a second operating member controlled by the same key, a third operating member controlled by the other of said keys to effect the restoration of said first operating member without effecting the restoration of said second operating member, a set of contact springs controlled by said operating members, and means responsive to the operation of said keys for controlling said operating members to variably operate said set of contact springs.
  • a pair of manually operable keys an operating member controlled by one of said keys, a second operating member controlled by the same key, a third operating member controlled by the other of said keys to efiect the restoration of said first operating member Without efieoting the restoration of said second operating member, contact springs controlled by said operating members, means responsive to the operation of said keys for controlling said operating members to variably operate said contact springs, a switchhook controlling said operating members, and means responsive to the restoration of the telephone on the switchhook for restoring the operated memhere to normal.
  • a telephone system two subscribers lines, a substation telephone set terminating said lines, a pair of keys associated with said set, an operating member individual to each key and engaging each other so the movement of one is dependent on the movement of the other, a single operating member individual to only one of the keys and movable independently of said other operating members, a set of contact springs controlled by said operating members, means responsive to the operation or" one of said keys for moving the operating members engaging each other and the single member to operate said contact springs and connect one of said subscribers lines to said set, means responsive to the operation of the other of said keys for moving only the operating members engaging each other to restore only certain of said contacts for connecting a holding bridge across said line, for disconnecting said line from the set, and for connecting the other of said lines to the set.
  • a pair of keys a pair or" operating members controlled by said keys, one of said operating members controlled by both of said keys and the other operating member controlled by only one of said keys, and contact springs controlled by said operating members.
  • a pair of keys a pair of operating members controlled by said keys, one of said operating members controlled by each of said keys, the other operating member controlled solely by one of said keys, and sets of contact springs controlled by said operating members.
  • keys In a telephone instrument, keys, operating members controlled by said keys, one of said operating members controlled by all of said keys and another operating member controlled by only a single key, and contact springs operated by said operating members.
  • a pair of keys a pair of operating members, sets of contact sprin s controlled by said operating members, one of said operating members controlled by both of said keys separately to operate said contact springs in a certain manner and the other of said operating members controlled by only one of said keys to control said contact springs in another manner.
  • a pair or" keys a pair of operating members controlled by said keys, one of said operating members controlled by either or” said keys and the other of said operating members controlled by only one of said keys, and a plurality of sets of contact springs variably operated by said operating members.
  • a pair of keys a pair of operating members controlled by said keys, one of said operating members controlled by either of said keys and the other operating switchhook for restoring said operating members to normal.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Structure Of Telephone Exchanges (AREA)
  • Telephone Set Structure (AREA)
US400402A 1928-11-07 1929-10-17 Telephone instrument Expired - Lifetime US1932647A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB32544/28A GB324954A (en) 1928-11-07 1928-11-07 Improvements in or relating to telephone instruments

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US1932647A true US1932647A (en) 1933-10-31

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US400402A Expired - Lifetime US1932647A (en) 1928-11-07 1929-10-17 Telephone instrument

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BE (1) BE361647A (enrdf_load_html_response)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2524350A (en) * 1945-07-13 1950-10-03 Kellogg Switchboard & Supply Telephone set with means for adjusting its antisidetone circuit
US2541336A (en) * 1948-08-23 1951-02-13 Automatic Elect Lab Secretary's answering key cabinet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2524350A (en) * 1945-07-13 1950-10-03 Kellogg Switchboard & Supply Telephone set with means for adjusting its antisidetone circuit
US2541336A (en) * 1948-08-23 1951-02-13 Automatic Elect Lab Secretary's answering key cabinet

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Publication number Publication date
BE361647A (enrdf_load_html_response)
GB324954A (en) 1930-02-07

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