US1334750A - Selecting-switch - Google Patents

Description

C. L. GOODRUM AND J. A. KROPP.

SELECTING SWITCH. APPLICATION FILED FB.27, 1917.

1,33%,750. Patented Mar. 23, 1920.

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//7 V/7/0/S.' Char/es L 6004/41/71 John A. Krupp C. L. GOODRUM AND J. A. KR OPP.

SELECTING SWITCH.

APPLICATION FILED F554;, 1911-.

Patented Mar. 23, 1920'.

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CHARLES L. GOODRUIVII, or BnooKLYiLnnvv YonK, Ann JOHN A. trader, or OAK PARK,

ILLINOIS, nssrenons no wnsrnaiv nLncrnIc ooMrANY, inoonronaren, on new YORK, 11. Y., A CORPORATION or NEW YQR-K.

SELECTING-salmon.

Specification of Letters Patent. P t ted IiIa1-.23, 1920.

Application filed February 27, 1917'. Serial No. 151,226.

To all whom it may concern:

Be it known that we, CirAnnns L. Goon- RUM and JOHN A. Knorr, citizens of the United States, residing at Brooklyn, in the county of Kings and State of New York, and at Oak Park, in the county of Cook and State of Illinois, respectively, have invented certain new'and useful Improvements in Selecting-Switches, of which the following is a full, clear, concise, and exact description.

This invention relates to an improvement in selecting switches.

The present invention has for its purpose the novel construction and arrangement of parts of a selecting switch which shall provide a structure materially reduced in size, and one which shallbe eflicient in operation and economical to construct, install and maintain.

Another feature of this invention is the provision of novel. means for controlling a mechanical relay, such means being simple in construction, and positive and accurate in operation.

Referring to the drawings, Figure 1 is a side elevation of the improved selecting switch, certain parts being broken away for clearness in illustration and description; Fig. 2- is a plan view of the same; Fig. 3 is a front elevation; Fig. 41 is a sectional plan view taken on the line l -4 of Fig. 1; Fig. 5

is a'section on the line 5-5 of Fig. 1, certain parts of the structure being broken away for clearness in illustration and description; Fig. 6 illustrates diagrammatically an operating circuit for the improved selecting switch.

Referring in detail to the drawings, 10 designates a brush-carrying element or shaft mounted for vertical and rotary movement in the supporting structure (not shown). The shaft carries brushes 11. which engage contacts 12 of a: switch bank 13. The shaft 10, near its intermediate portion, is provided with vertical ratchet teeth 14: which are cut by a vertical slot 15. In depth this slot is cut to the surface of the shaft and is sufficiently wide to permit unobstructed elevation of the shaft after its first rotary step. The vertical ratchet teeth are engaged by a vertical elevating pawl 16 carried. by the armature 17 of a primary motor magnet 18. The motor magnet 18 is provided with a frameli) which is connected to the supporting structure and which 1s provided with a catch 20 normally engaged by a projection on the vertical pawl 16. The framelS) also carries a stationary holding dog as, which is in the vertical slot 15 during the elevation of shatt 10 and engages one of the vertical ratchet teethon rotation of the shaft to sup port the shaft in its elevated position; The shaft 10 is also provided with rotary ratchet teeth 21 which are engaged by a pawl 22mried by the armature 23 of a secondary magnet 24. It should be noted that the contacts 12 are so positioned with respect to brushes 11, that the first rotary step of the shaft does not bring these elements into engagement. The secondary magnet 24 is secured to the supporting structure in frame 26 (Fig. 1) which carries an arm serving to normally hold pawl 22 out of engagement with the rotary ratchet teeth. 27 designates the release magnet which remains energized during the interval in which the switch is being utilized in establishing and maintaining a connection. with an armature 28 to which is pivotally se- The release magnet 27 is provided cured the vertical holding dog 29 and the rotary holding dog 30. An escape magnet 31 is provided with an armature 32 which controls the well-known escapement members 33. These members 33 control the step-bystep escape of an arm 34:. which actuates the block 35 of a mechanical relay or side I switch. This bloclc is provided with the usual side-switch wipers-36 which engage well-known side-switch contacts to control the operating circuits of the switch. It

should be noted that the arm 34L of the side- I switch block is placed under tension as soon as the release magnet is energized. This is accomplished in the following manner: A leaf spring 37 is attached at one of its ends to the armature of the release magnet, and its other end is secured to-the arm 3.4 by a link 38. It willv be understood that, during the operation of the switch, this leaf spring 37 places a tension on the side-switch'arm 34-, such that this member is positively operated under the control of the escape ma net. When, however, it is desired torestore the switch to its normal position, the release magnet is deenergized, and onthe retraction switch, thereby insuring the prompt return of the side switch to its normal position. A coiled spring 39, secured at one of its ends to the shaft and at its other end to the frame, is placed under tension when the shaft is rotated from its normal position. This spring insures the restoration of the shaft to its normal position when the switch is released.

' Referring to the operation of the switch,

it is proposed to omit certain of the re lays formerly used in step-by-step selecting switches, and so to arrange the magnets of the switch that they will perform the addi tional functions formerly performed'by rclays. When the calling line is extended to this selecting switch, its vertical magnet is energized, thereby attracting its armature, which operates to close circuit-closing springs 40. These circuit-closing springs control the operating circuit of the release magnet. This first encrgizati 011 of the magnet 18, however, does not elevate the shaft since the elevating pawl 16 is held out of engagement with the vertical ratchet teeth by a stop which engages a projection 41 car- 1 ried on the armature of the release magnet. The closing of the spring 40 energizes the release magnet 27 This magnet upon energization attracts its armature,thereby moving the projection 41 out of the path of the vertical pawl 16 and placing the vertical holding dog 29 in engagement with the Vertical ratchet teeth and the rotary holding dog 30 in engagement with the rotary ratchet teeth. After'the first series of directive impulses, the escape magnet 31 deenergizes and the side-switch arm 34 under the tension of leaf spring 37 is escaped one step by the escapement members 38. The sideswitch wipers in their second position complete an operating circuit for rotary magnet 24, which actuates its armature and the rotary pawl 22 to rotate the shaft during the trunk-hunting operation. The holding dog 42 operates to hold the shaft in, its elevated position after the switch has made its first rotary step. At the close of the conversation, when one of the parties has replaced his receiver, the releasemagnet 27, which has been energized during this period, has

its circuit interrupted and thereupon rctracts its armature. This moves the vertical and rotary holding dogs out of engagement with the vertical and rotary ratchet teeth, and the spring 39 rotates the shaft until the stationary dog 42 encounters the slot 15, whereupon the shaft drops to its normal position;

Referring to the circuit arrangement as disclosed in Fig. 6, when the subscriber at substation 5'0 removes his receiver from the switchhook, the brushes 51, 52 and 53 of a finder locate contacts 54, 55 and 56 of the calling line. The calling line is then tended to a selecting switch of the type herein disclosed and described. As soon as the line is extended to this selecting switch, primary magnet 1.8 is energized over a circuit which extends from grounded battery, left-hand winding of the primary magnet 18, side-switch wiper 36 in its first position, brush 52, contact 55,substation apparatus 50, contact 54, brush 51, side-switch wiper 36 right-hand winding of primarymotor magnet 18, to ground. Magnet 18 thereupon attracts its armature and completes an en ergizing circuit for the release magnet 27, which magnet in this arrangement controls the setting of the vertical and rotary holding dogs. The release magnet is energized over a circuit which extends from grounded batter right-hand winding of magnet 27, normally closed contact 44, front contact and armature of magnet 18, to ground. Release magnet 27 upon energization, attracts its armatures, and at its left-hand armatu completes a locking circuit which extends from grounded battery, right-h and winding of release magnet 27, front contact and lefthand armature of release magnet 27, front contact and armature of primary motor magnet 18, to ground. It should here be noted that the normally closed contact 44 is opened as soon as the shaft takes its first vertical step. 1

When the calling subscriber operates his sending device to transmit impulses corresponding to the desired number, the armature of magnet 18 is vibrated to elevate the brush shaft and in so doing, completes an energizing operating circuit for the secondary magnet 24, which in this arrangement serves to control the operating circuit of the escape magnet 31. The circuit for the secondary magnet extends from grounded battery, magnet 24, normally closed contact 43, front contact and right-hand armature oi release magnet 27 back-contact and armature of primary magnet 18, to ground. Secondary motor magnet 24 is thereupon energized and attracts its armatures. It should be remembered that the contacts 12 and brushes 11 ar-e'so positioned that they are not brought into engagement by the first ac tuation of the left-hand armature of magnet 24. At its right-hand armature, magnet 24 completes an energizing circuit for the escape magnet 31, which circuit may be traced from grounded battery, escape magnet 31, conductor 57, side-switch wiper,36'?, front contact and right-hand armature of magnet 24, to ground. At the close of the series of directive impulses from the sending device, magnet 18 attracts its armature for a relatively long interval, thereby interrupting at its back contact the energizing circuit ofthe secondary magnet. This magnet, although slow to release, during this relatively long interval retracts its armatures, and at its right armature and front contact interrupts the energizing circuit of the escape magnet. The deenergization of this escape magnet operates to move the side-switch wipers to their second position.

Then the side switch moves into the second position, the secondary magnet is operated over a self-interrupting circuit which extends from grounded battery, secondary magnet 24, left-hand armature and back contact of magnet 24;, side-switch wiper 36 in its second position, armature and back contact of escape magnet 31, to ground. The secondary magnet continues to operate until the test brush 11 encounters a grounded test terminal 12, whereupon the escape magnet is energized over the following circuit: grounded battery, escape magnet 31, conductor 57, side-switch wiper 36 in its second position, test brush 11, test contact 12, to ground. The escape magnet 31 Y attracts its armature and thereby interrupts the operating circuit of the secondary magnet, and moves the side-switch wipers into their third or talking position. The line relay of the succeeding selecting switch (not shown) immediately removes the ground condition from contact 12 so that the escape magnet 31 is deenergized, thus preventing the release of the switch.

If the calling party replaces his receiver before the side-switch wiper 36 has moved into its third position, the release magnets at the preceding selecting switches will have their operating circuits completed over contact 56, brush 53, side-switch wiper 36 in its first or second position, conductor 58, right-hand armature and back contact of magnet 27, armature and back contact of magnet 18, to ground.

At the close of the conversation, when the calling party replaces his receiver on the switchhook, circuit conditions are brought about which replace the ground condition on test contact 12, as indicated in the patent to Goodrum, No. 1,231,013, issued June 26, 1917. The escape magnet is energized over a circuit which may be traced from grounded battery, escape magnet 31, conductor 57, side-switch wiper 36 in its third position, test brush 11, test contact 12, to ground. An energizing circuit for the, release magnets of the preceding selecting switches, in parallel with the last described circuit, extends from contact 56, brush 53, side-switch wiper 36 in its third position, conductor 57, side-switch wiper 36 in its third position, test brush 11 and grounded test contact 12. The escape magnet thereupon attracts its armature and interrupts at its back contact the energizing circuit for the release magnet, which may be traced from grounded battery, right-hand winding of release magnet 27 left-hand winding of this same magnet, side-switch wiper 36 in its third position, armature and back contact of escape magnet 31, to ground. The left-hand winding of release magnet 27 is of relatively high resistance as compared to its right-hand winding. This causes the release magnet, when its energizing circuit extends through both of its windings, to deenergize quickly on any interruption of its operating circuit. \Vhen the calling party replaces his receiver -on the switchhook, magnet 18 is deenergized and retracts its armature, and when the re lease magnet 27 has retracted its righthand armature, another energizing circuit for the release magnet of the preceding selector switches is completed as above described over contact 56, test brush 53, side-- switch wiper 36 now restored to its first position, conductor 58, right-hand armature and back contact of release magnet 27, back contact and armature of primary magnet 18, to ground.

The normally closed contact 4C3, which is opened on the first rotary step of the shaft, prevents the shaft from being again stepped until the switch has been restored to its normal position.

\Vhat is claimed is:

1. In an automatic switch, passive contacts, active contacts, a member to which said active contacts are, secured, said member being mounted for group and line selecting movements, means for operating said member, circuit-controlling means, a member for placing the operating parts of said circuit-controlling means under tension while being actuated and for restoring said circuit-controlling means to normal position.

2. In an automatic switch, passive contacts, active contacts, a member to which said active contacts are secured, said memher being mounted for vertical and rotary movement, means for operating said member, a mechanical'relay, and a member for placing the operating parts of said relay under tension while being actuated and for restoring said relay to normal position.

3. In an automatic switch, passive contacts, active contacts, a member to which said active contacts are secured, said member being mounted for primary and secondary movements, operating means for said member, a mechanical relay, means controlling the release of said member to its normal position, and means associated with said release controlling means for placing the operating parts of said mechanical relay under tension while actuated.

4-. In an automatic switch, passive contacts, active contacts, a member to which said active contacts are secured, said member being mounted for vertical and rotary movements, operating means for said member, a mechanical relay, means controlling the release of said member to its normal position, and means associated with said release-controlling means for placing the op erating parts of said mechanical relay under tension while actuated. I

5. In an automatic switch, passive contacts, movable brushes mounted to engage said passive contacts, a shaft to which said brushes are secured, said shaft being mounted for movement in two directions,

means for operating said shaft, releasemechanism including an clectromagnet provided with an armature, holding elements carried by said armature, said holding elements operating to maintain said shaft in its actuated position, said electromagnet being actuated during the directiveoperation of said shaft.

(3. In an automatic switch, passive contacts, active contacts, a member to which said active contacts are secured, said memher being mounted for primary and secondary movements, operating means for said member, a release mechanism including an electromagnet provided with an armature, a mechanical relay, and means controlled by the actuation of said armature for placing the operating parts of said mechanical re lay under tension.

7 .-In an automatic switch, passive contacts, active contacts, a shaft to which said contacts are secured, said shaft being mounted for movement in two directions, primary stepping means for operating said shaft in one direction, secondary stepping means for operating said shaft in a second direction, means controlling the sequence of operation of said primary and secondary stepping means, means for releasing said shaft, and means for preventing said shaft from being stepped on the first actuation of said primary stepping means.

8. In an automatic switch, passive contacts, active contacts mounted for group and line selecting movements, means for operating said active contacts, a circuit controlling device, a resilient member for placing the operating parts of said circuit controlling device under tension while being actuated and while being restored to its normal position, and means for actuating said resilient member.

9. In an automatic switch, passive contacts, active contacts mounted for vertical and rotary movement, means for actuating said active contacts, a mechanical relay, a resilient member for placing the operating parts of said relay under tension while being actuated and while being restored to normal position, and means for actuating said resilient member.

In witness whereof, I hereunto subscribe my name this 18th day of February A. D.,

7 CHARLES L. GOODRUM. In witness whereof, I hereunto subscribe my name this 20 day of Feb. A. D., 1917.

JOI II A. KROPP.

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