US2277191A - Combined line and cutoff relay for telephone systems - Google Patents

Combined line and cutoff relay for telephone systems Download PDF

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Publication number
US2277191A
US2277191A US302517A US30251739A US2277191A US 2277191 A US2277191 A US 2277191A US 302517 A US302517 A US 302517A US 30251739 A US30251739 A US 30251739A US 2277191 A US2277191 A US 2277191A
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United States
Prior art keywords
springs
line
armature
relay
circuit
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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US302517A
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English (en)
Inventor
Ray S Wilbur
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.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
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Filing date
Publication date
Priority to BE469888D priority Critical patent/BE469888A/xx
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US302517A priority patent/US2277191A/en
Application granted granted Critical
Publication of US2277191A publication Critical patent/US2277191A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H67/00—Electrically-operated selector switches
    • H01H67/02—Multi-position wiper switches
    • H01H67/14—Multi-position wiper switches having wipers movable in two mutually perpendicular directions for purpose of selection
    • H01H67/16—Multi-position wiper switches having wipers movable in two mutually perpendicular directions for purpose of selection one motion being rotary and the other being parallel to the axis of rotation, e.g. Strowger or "up and around" switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/02—Non-polarised relays
    • H01H51/04—Non-polarised relays with single armature; with single set of ganged armatures
    • H01H51/06—Armature is movable between two limit positions of rest and is moved in one direction due to energisation of an electromagnet and after the electromagnet is de-energised is returned by energy stored during the movement in the first direction, e.g. by using a spring, by using a permanent magnet, by gravity
    • H01H51/08—Contacts alternately opened and closed by successive cycles of energisation and de-energisation of the electromagnet, e.g. by use of a ratchet
    • H01H51/082—Contacts alternately opened and closed by successive cycles of energisation and de-energisation of the electromagnet, e.g. by use of a ratchet using rotating ratchet mechanism
    • H01H51/086—Contacts alternately opened and closed by successive cycles of energisation and de-energisation of the electromagnet, e.g. by use of a ratchet using rotating ratchet mechanism with radial ratchet elements

Definitions

  • This invention relates to telephone systems and more particularly to a combined line and cutoff relay structure applicable to a subscribers line for replacing the usual individual line and cut-off relays and for performing all of the functions thereof. It is the object of the present invention to simplify and to reduce the cost of the individual relay equipment of subscribers lines.
  • a relay of a standard type now used extensively in telephone systems, is modined by the addition of two cam wheels operable step by step by a pawl secured to the relay armature which cams are eiective to control certain of the springs of the relay spring pile-ups, other springs of the pile-ups being operable by the armature in the usual manner, while still other springs are operable both in the usual manner and by the cam wheels.
  • the cam wheels are secured to a shaft supported transversely of the front end of the relay core, one of the cam wheels having iive teeth and the other ten teeth, the latter also serving as a ratchet wheel with which a pawl secured to the armature cooperates. The shaft is thus rotated one-tenth of a revolution upon each attraction of the armature.
  • the local energizing circuit In the fully attracted position of the armature, the local energizing circuit is opened, both windings are disconnected from the line loop and the ve-tooth'ed cam wheel operates springs to connect the tip winding of the relay to the sleeve terminal of the line and operates other contact springs to prepare a signaling circuit, which as illustrated may be the start circuit of a line finder.
  • the armature restores engaging contact springs to complete the line-finder start circuit or signaling circuit.
  • the relay has now performed all of the functions normally performed by the usual line relay.
  • the relay is again energized by its tip winding over contact springs closed by the iive-toothed cam wheel and at tracts the armature to advance the shaft another step, the armature in its attracted position opening the start circuit and holding the contact springs closed whereby the tip winding remains connected to the sleeve terminal and is maintained energized until the connection is released.
  • both windings of the relay are disconnected from the line loop.
  • the relay deenergizes and returns all contact springs to their normal condition.
  • the relay has now performed the functions normally performed by the usual cut-off relay;
  • the tip winding thereof is energized over the connector sleeve terminal and the armature in passing to its fully attracted position advances the cam wheels, the ten-toothed cam wheel momentarily closing a local energizing circuit through both windings of the relay and the five-toothed cam wheel opening contact springs included in the energizing circuit through the tip winding.y In its fully attracted position, the local energizing circuit is opened at other contact springs whereby the armature is restored and closes the line-nnder start circuit.
  • the energizing circuit through the tip winding of the relay is, however, immediately reclosed and the relay again attracts its armature advancing the shaft another step, thereby opening the start circuit.
  • This momentary closure of the start circuit is not effective in this Case to start a line nder since the line-finder start relay may be made slow to operate.
  • the energizing circuit through the tip winding is now maintained over contact springs which were permitted to close by the second step taken by the Ve-toothed cam wheel and both windings are disconnected from the tip and ring conductors of the line loop.
  • the relay releases and restores all of its contact springs to their normal condition.
  • the relay performs all of the functions performed by the usual cut-01T relay.
  • Fig. l is a side elevational view of a relay in which the present invention is embodied
  • Fig. 2 is a front elevational view of the relay
  • Fig. 3 shows schematically a subscribers line, a line iinder having access thereto, the relay and the circuits controlled thereby in their normal condition;
  • Fig. 4 illustrates the operated position of the relay and the condition of the circuits controlled thereby immediately following the initiation of a call on the subscribers line and the closure of the line loop;
  • Fig. 5 illustrates the succeeding released position of the relay and the condition of the circuits controlled thereby at which time the lineiinder start circuit is closed;
  • Fig. 6 illustrates the succeeding operated position of the relay and the condition of the circuits controlled thereby at the time the line terminals are seized by the line nder.
  • the improved relay structure is of the general type disclosed in Patent 2,178,656, granted November '7, 1939 to P. W. Swenson and comprises a supporting bracket I to which the rear end of a forwardly extending core 2 and a hinge bracket 3 are suitably secured, a coil 4 having two windings surrounding the core'2, a U-shaped armature 5, the arms of which are pivoted by pins 6 on the arms, of the hinge bracket 3 and the forward cross reach of which cooperates with the pole face 'I of the forward end of the cord 2, a back-stop screw 8 secured in the forward end of the core 2 having a back-stop nut 9 thereon for adjusting the normal air-gap between the armature and the pole face of the core, and two spring pile-ups I3 and II, one on either side of the coil, insulatedly supported on and secured to the mounting bracket I by screws I2.
  • this relay structure has been modied by the addition of two cam wheels I3 and I4 secured respectively on the opposite ends of a shaft I5 which is rotatably mounted in a bracket IE extending transversely across the forward end of the relay core and secured to the core 2 bythe screw Il.
  • the cam wheel I3 which is provided with ten teeth and serves also as a ratchet wheel by means of which both cam wheels may be rotated step by step under the control of spring pawl I8 secured to the end of the armature 5 by screw I9. cooperates with a stud 20 of insulating material secured to the contact spring 2
  • the cam wheel I4 has ve teeth and cooperates with a stud 22 of insulating material secured to the contact spring 23 which passes freely through a hole in its mate spring 24. Normally the contacts of springs 23 and 24 are in engagement. Cam wheel I4 also cooperates with a stud 25 secured to the spring 26 which spring mates with a spring 21 and is normally out of contact therewith.
  • the active contact springs 28 and 3U are normally in engagement with their mate springs 29 and 3
  • the active spring 33 is normally in engagement with its mate spring 34 and has staked thereto a stud 35 which passes freely through a hole in spring S4 into engagement with the inner surface of the end oi' armature 5.
  • the upper end of stud 35 is positioned for engagement with the lower end of stud 32 so that when the armature is attracted, the stud 35 is moved to operate spring 33 and by its enga gement with stud 32 also operates springs 23 and 33.
  • the active contact spring 35 cooperates with a back contact spring 38 with whichv it is normally engaged and with a front contact spring 31 and has staked thereto an insulating stud 33 which extends freely through a hole in spring 38.
  • a stud 44 Positioned immediately below the lower end of stud 39 is a stud 44 which is staked to spring 26 and passes freely through a hole in spring 2l.
  • a stud 4I is secured to the armature with its upper end positioned beneath the lower end of stud 43 whereby when the armature is attracted the stud 4I engages the stud 43 to operate spring 23 and stud 4) engages stud 39 to operate spring 36.
  • a subscribers substation 42 is schematically disclosed which is connected over the tip line conductor 43 and the ring line conductor 44 to terminals appearing in the bank of a line nder 45, schematically illustrated by the set of brushes, and also to terminals of terminal set 45 of a connector bank. Normally the cam wheels and contact springs are in the condition illustrated in Fig. 3.
  • the pawl I8 secured to the armature advances the ratchet wheel I3 one tooth or one step.
  • the stud Z3 rides up upon the top of a tooth of the cam wheel and causes the engagement of spring 2
  • This circuit insures that the windings will be maintained energized until the armature is fully attracted since upon the movement of the armature, the stud 35 engaged thereby will open the line loop operating circuit for the relay windings by moving spring 33 out of engagement with spring 34.
  • cam wheel I3 In the half step position of cam wheel I3, springs 2
  • the second step advance of cam wheel I4 permits spring 23 to reengage spring 24 and moves its tooth from under the end of stud 25, but springs 26 and 36 are not permitted to restore since they are now held in their operated positions by stud 4I secured to the armature which is now positioned with its up-per end in engagement with the lower end of stud 40.
  • the relay armature is now maintained in its attracted .position by the L energization of the upper winding of coil 4 until the connection is released and ground is removed from the test brush 50. With the springs 33 and 34 disengaged and springs 33 and 38 also disengaged, both windings of the coil 4 are disconnected from the line conductors. When ground is disconnected from test brush 50, the upper winding of coil 4 becomes deenergized and the armature releases to restore the circuit to its normal position illustrated in Fig. 3.
  • the line could be a line of a manual exchange system in which the circuit closed over the start conductor 49 could control the lighting of a line lamp and the relay would be responsive to the seizure of the line by an operator to extinguish such line lamp.
  • a relay having a core, windings thereon, an armature cooperating with said core, sets of springs having contacts operable by said armature, a rst energizing circuit for said windings extending over normally closed contacts of certain of said springs, means controlled by the first energization of said windings over said circuit to operate certain of said springs to disconnect said windings from said circuit and to connect one of said windings to a second operating circuit, means operative upon the deenergization of said windings to operate certain of said springs to close a signaling circuit and means operative upon the reenergization of said one winding over said second operating circuit to operate certain of said springs to open said signaling circuit, said winding becoming deenergized upon the subsequent opening of said second operating circuit to restore all springs to their normal condition whereby said windings are reconnected to said rst operating circuit.
  • a combined line and cut-off relay having a core, windings thereon, an armature cooperating with said core, sets of springs having contacts operable by said armature, means controlled by a rst energization of both windings over a line loop to operate certain of said springs to disconnect said windings from said loop, to momentarily connect said windings in a local operating circuit, to prepare a signaling circuit and to prepare a second operating circuit through one of said windings, means operative in response to the deenergization of said windings upon the opening of said local operating circuit to operate certain or said springs to close said signaling circuit and means operable upon the reenergization of said one winding over said second operating circuit to operate certain of said springs to open said signaling circuit, said one winding becoming deenergized upon the opening of said second operating circuit to restore all springs to their normal condition whereby said windings become reconnected to the line loop.
  • a combined line and cut-off relay having a core, windings thereon, an armature cooperating with said core, first sets of contact springs operable by said armature over which said windings are normally connected to a line loop, a rotatable shaft having carn wheels thereon, a pawl secured to said armature whereby said shaft is advanced step by step upon successive actuations of said armature, a second set of contact springs momentarily operable during the rst step advance of one of said cam wheels by the attraction of said armature in response to the closure of the line loop to close a local energizing circuit for said windings, a third set of Contact springs operable by the first step advance oi' said other cam wheel for preparing a signaling circuit, said armature in its fully attracted position operating said nrst sets of springs to disconnect said windings from said line loop whereby upon the opening of said momentarily operated second set of springs said windings are deenergized to release said
  • a combined line and cut-off relay having a core, windings thereon, an armature cooperating with said core, sets of springs having contacts operable by said armature, said windings being normally connected to a line loop over certain o1' said springs and one winding being normally connected to a second operating circuit over other of said springs, means controlled by a first energization of said one winding over said second operating circuit to operate certain of said springs to disconnect said windings from the line loop and from said second operating circuit whereby said one winding becomes deenergized to operate other of said springs to reconnect said one winding to said second operating circuit whereupon said one winding again becomes energized to operate springs whereby it is maintained energized so long as said second operating circuit is maintained closed.
  • a combined line and cut-off relay having a core, windings thereon, an armature cooperating with said core, rst sets of contact springs operable by said armature over which said windings are normally connected to a line loop, an operating circuit for one winding of said relay extending in parallel over second and third sets of contact springs, a rotatable shaft having a cam wheel thereon, a pawl secured to said armature whereby said shaft is advanced step by step upon successive attractions of said armature and means for closing said operating circuit whereby said armature is attracted to open said first sets oi springs to disconnect said windings from the line loop7 to open said second set of contact springs and to advance said cam wheel one step to open said third set of springs, said winding thereupon deenergizing to release said armature whereby said second set of springs is reclosed to reestablish said operating circuit whereupon said armature is reattracted to advance said cam wheel a second step to reclose

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Relay Circuits (AREA)
US302517A 1939-11-02 1939-11-02 Combined line and cutoff relay for telephone systems Expired - Lifetime US2277191A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE469888D BE469888A (d) 1939-11-02
US302517A US2277191A (en) 1939-11-02 1939-11-02 Combined line and cutoff relay for telephone systems

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US302517A US2277191A (en) 1939-11-02 1939-11-02 Combined line and cutoff relay for telephone systems

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US2277191A true US2277191A (en) 1942-03-24

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542954A (en) * 1945-10-05 1951-02-20 Siemens Brothers & Co Ltd Automatic telephone system
US2714629A (en) * 1951-05-19 1955-08-02 Nederlanden Staat Marking circuit
US2969433A (en) * 1947-09-10 1961-01-24 Vigren Sten Daniel Crossbar switches
US3156777A (en) * 1959-07-13 1964-11-10 Itt Balanced lockout line circuit
US3482056A (en) * 1966-11-22 1969-12-02 Northern Electric Co Identification of a subscriber's request for service

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542954A (en) * 1945-10-05 1951-02-20 Siemens Brothers & Co Ltd Automatic telephone system
US2969433A (en) * 1947-09-10 1961-01-24 Vigren Sten Daniel Crossbar switches
US2714629A (en) * 1951-05-19 1955-08-02 Nederlanden Staat Marking circuit
US3156777A (en) * 1959-07-13 1964-11-10 Itt Balanced lockout line circuit
US3482056A (en) * 1966-11-22 1969-12-02 Northern Electric Co Identification of a subscriber's request for service

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Publication number Publication date
BE469888A (d)

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