US2409054A - Relay construction - Google Patents

Relay construction Download PDF

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Publication number
US2409054A
US2409054A US492568A US49256843A US2409054A US 2409054 A US2409054 A US 2409054A US 492568 A US492568 A US 492568A US 49256843 A US49256843 A US 49256843A US 2409054 A US2409054 A US 2409054A
Authority
US
United States
Prior art keywords
contact
strips
metallic
armatures
armature
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
US492568A
Other languages
English (en)
Inventor
Frank R Mcberty
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.)
NORTH ELECTRIC MANUFACTURING Co
Original Assignee
NORTH ELECTRIC Manufacturing 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
Priority to NL65720D priority Critical patent/NL65720C/xx
Priority to BE468621D priority patent/BE468621A/xx
Priority claimed from US348222A external-priority patent/US2396332A/en
Application filed by NORTH ELECTRIC Manufacturing Co filed Critical NORTH ELECTRIC Manufacturing Co
Priority to US492568A priority patent/US2409054A/en
Priority to US652335A priority patent/US2550577A/en
Application granted granted Critical
Priority to CH279786D priority patent/CH279786A/de
Publication of US2409054A publication Critical patent/US2409054A/en
Priority to FR934844D priority patent/FR934844A/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/56—Contact spring sets
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/02—Non-polarised relays
    • H01H51/20—Non-polarised relays with two or more independent armatures

Definitions

  • My invention relates, generally, to the construction oi relays for automatic telephone exchanges and it has particular relation to the construction of the stationary contact members thereof.v
  • This application is a division of my copending application Serial No. 348,222, filed July 29, 1940.
  • my invention comprises certain new types of electro-magnetic switching devices,
  • U-shaped magnetic member com- Figure 1 is a view, in side elevation, certain parts having been broken away to more clearly show the details of construction, illustrating one embodiment of my improved relay construction assembled as a part of a line finder or connector link of an automatic telephone exchange of the relay type;
  • Figure 2 is an end view of the construction shown in Figure 1, certain parts being shown in section;
  • Figure 2A is a sectional View, similar to Figure 2, showing in more detail the arrangement of the magnetic circuit
  • Figure 3 is a plan view, at an enlarged scale, showing the arrangement of one set of movable and stationary contact members
  • Figure ,4 is a longitudinal sectional View taken along the line 4-1l of Figure 3;
  • FIG. 5 is a detail sectional View taken along the line 5 5 of Figure 4.
  • the reference characters I9 and Il each designate, generally, a relay construction.
  • Each of these relay constructions may comprise what is known in the telephone art as a tens relay, ten of which are mounted in alignment to provide the tens relay cfa line finder or connector link, as is disclosed in more detail in my copending application Serial No. 348,223, iiied July 29, 1940. Since the construction oi the relays iii and l I is identical, only one of them will be described in detail herein.
  • relays are designed for use in connection with the'type oi' automatic selective system for automatic telephone exchanges known as the All-relay system, of which the selective structureand its inode of operation are described in Telephone Theory and Practice, by Kempster B, Miller, first edition, 1933, chapter VI.
  • eachjrelay is provided with a magnetic circuit which may be that of an electromagnet having a broad pole piece with a suitable magnetic return.
  • the toward pole piece may take the form of YaT and the return pole piece may have the form of, an intertting U member comprising side plates i2 and the back-bar I3.
  • the two-sided magnetic structure is designed toreceive'on each of its sides, groups or armatures whereby the groups of armatures are acted upon by substantially equal portions of the flux generated'in the core and thereby respond in substantially equal acts to equal forces'.r
  • the T-shaped magnetic member which nterprises a pole piece I4 and a core I5.
  • the core I5 comprises the stem of the T and around it is positioned a winding or coil I6 of conventional design.
  • the core I5 may be secured to the back lbar I3 and the pole piece I4 by press fits, if it is not desired to provide for ready removal of the coil I0. If it is desired to permit ready removal of the coil I6, then the pole piece I4 should be arranged to be readily detached from the core I5 or the core I5 should be arranged to be readily detached from the back bar I3.
  • the pole piece I4 is of such material and climansions with relation to the U-shaped member, the core I5 and the coil I6 that the flux generated by the coil is as nearly as possible equally distributed Ibetween the two sides of the pole piece and throughout the length of each side.
  • air gaps I1 are pro-- vided between the ends of the U-shaped magnetic member formed by the side plates I2 and the back bar I3 and the ends of the top of the T-shaped magnetic member formed by the pole piece I4 andthe core I5. These air gaps are preferably about 55s inch long. However, these air gaps bear a certain necessary relation to the size and material of the armatures and their proximity to the pole piece, as will be fully described later.
  • clamp plates are provided on opposite sides of the side plates I2 and are secured in position by means of screws 2I which are threaded into the ends of strut members, one of which is shown at 22. 1t will be observed that the strut members 22 serve not only to provide a clamping action between the upper ends of the clamp plates '20, but also that they serve to space them and the side plates I2 apart.
  • an insulating block 23 Positioned on top of 'the pole piece I4 and common to both of the relays I0 and Il is an insulating block 23 which is secured in position by screws, one of which is shown at 24, which project through the pole pieces I4 and into the upper threaded end of a strut member 25, the lower end of 'which is threaded into the back bar 13.
  • the insulating block 23 is preferably formed cf moul'dable material, such as a thermoplastic.
  • moulded contact members 2G which form the stationary contact members of the relays. As is shown more clearly in Figure 4 of the drawing, each of the contact members 23 is provided with a reentrant portion 21 about which the material forming the insulating block 23 is moulded to securely grip the contact members in position.
  • the contact members 26 are provided with extensions 26a, 2Gb, 26e, 26d, etc.
  • the Vextensions 26a, 26D, 26d., etc. are arranged in staggered relation of decreasing lengths and their upper ends are turned outwardly as indicated at 28 and notched as indicated at 20.
  • This staggered arrangement of the extensions is provided in order to facilitate connection thereto of paralleling conductors which can then be positioned in coplanar relation.
  • corresponding extensions 20a of the relays I0 and II are connected in parallel circuit relation by a Wire which is secured in the notched portions 29 ⁇ by being spot welded therein.
  • the contact members .26 and their extensions are formed of good conducting nontarnishing material such as German silver. In the embodiment 'of the invention shown in the drawing they are 0.080 inch wide and alf inch thick. The lengths of course vary depending upon the length or the extension individual thereto.
  • Each contact ilnger 32 comprises a metallic reed 33 in the form of round wire which has good electrical conducting quality and is highly resilient and corrosion resisting. I have found that stainless steel wire, known lil-S, and having a diameter of 0.016 inch, is highly satisfactory for my purposes.
  • an armature 35 which serves not only to iiex the metallic reed 33 on energical tion of lthe winding I6 but also it serves to conthat an air gap of 0.032 inch is provided therebetween. yIt is possible to increase this air gap to 0.053 inch but the smaller air gap is preferable.
  • the armature 35 has been moved into its alternate position on energization of the coil I5, there is provided a residual air gap between the armature 35 and the adjacent edge of the pole piece I4 of from 0.010 to 0.012 inch. It will then be apparent that the movement of the armature 35 from one position to another is about 0.020 inch.
  • the armatures 35 are formed of material which not only has good electrical conducting properties but also material which is magnetic. I have found that material known as Allegheny metal No. 4750 is entirely satisfactory for this purpose.
  • Each of the armatures 35 is preferably about 0.478 inch long, about 0.080 inch wide and about 0.0429 inch thick.
  • the lower ends 33a 'of the metallic reeds 33 project beyond insulating support members 31.
  • the insulating support members S1 are formed of the same material as the insulating block 23 and, as will hereinafter appear, the metallic reeds 33 are especially prepared so as to make certain r that they will lbe securely held in the insulating support members 31 on completion of the moulding operation.
  • the insulating support members 31 in which are moulded the metallic reeds 33 may be secured in position on the back bar I3 by means of screws 38. These screws also serve to carry support members 39 which are arranged to support conductor brackets carrying conductors extending underneath the relays l0 and ll.
  • certain of the downwardly extendingends 33a, 33h, etc., of the metallic reeds 33 are arranged to be connected in parallel in their respective links, while the remaining downwardly projecting end portions are arranged to be cross connected as described.
  • each of the armatures 35 is provided with an erosion resisting contact member 4
  • is preferably formed or good conducting material which will resist erosion due to abrasion and arcing. I have found that round wire formed of palladium is satisfactory for this purpose.
  • a wire having'a diameter of 0.020 inch and a length of about 0.070 inch of this material is welded, as shown, across one face of the armature 35 to provide the contact engaging surface thereof.
  • Each of the contact members 25 is likewise provided with erosion resisting material. As shown,
  • each of the inserts 42 may be formed of palladium and are inlaid by conventional means in a strip of German silver from which the contact members and their integral extensions are cut.
  • the insert 42 is preferably about ea inch wide and about 0.010 inch thick.
  • each of the inserts e2 is grooved intermediate its ends so as to provide two distinct points of'contact engagement with the generally cylindrical contact member 4I carried bythe armature 35.
  • the lower end of the stationary contact conductor 26 is free of the backing of the insulating support 23, as will be seen in Figures 2, 3 and 4. This avoids the danger of clogging the contact portions with insulation, and it leaves the' free portion of the stationary contact conductor 26 of such short length that its natural period of vibration is extremely high.
  • the metallic reeds 33 are so arranged that they tend to bias the armatures 35 outwardly to a position beyond the normal open circuit position.
  • the glass rods 44 are held in position by means of suitable non-magnetic clamp members 45 which are held in place by the screws 2l.
  • t is the common experience in apparatusof the types herein under consideration that the resting anvils upon which spring points, levers and armatures normally rest under more or less pressure are subject .to various changes which alter the positions of the resting parts and .delay or stop their operation.
  • the metals and some insulating material used yield under the hammering of the return strokes of the.
  • the moving partsarmatures and reeds-in the invention here de scribed bear upon their resting anvils with slight force, merely enough to x accurately tbeposition of rest, and are intended to be operated upon by minimum attractive forces, since by these means the energy consumed by the device and the detrimental and destructive effects of the motion are reduced to a minimum and the speed of operation is increased.
  • the stop-rod 44 of Pyrex or equivalentglass is straight, inflexible, unchanging under normal temperatures; it is not deformed by the impact of the parts resting upon it; it suffers no chemical change, accumulates no moisture or dust, it changes temperature slowly and does not freeze the armatures; and in no way injuriously affects the metal parts resting upon it.
  • the operation of the armatures hundreds of millions of times, equivalent to thousands of years of commercial operation, exhibits practically no alteration in the characteristics of operation. It must be assumed that the impact of the returning armature upon the glass rod must expend in heat its energy of motion and must create some vibration; but it is found that the period of vibration is of such high frequency and so brief as to be hardly detectable in a cathode ray oscillograph.
  • a stationaryz contact assembly comprising a series of closely spaced flat metallic stripshav ing body portions disposed edge to edge substantially inthe same plane, said strips having their lower ends disposed on substantially the saine level, and their upper ends disposed at 'different levels and extending laterally out of said plane,
  • saidstrips having looped porM tions in alignment adjacent said lower ends and a supporting block of insulation having a face thereof disposed substantially in the plane of said strips and 'having integral portions moulded around and extending over said loops for holding the strips in fixed position.
  • a stationary contact assembly comprising a series of closely spacedthin at metallic strips having their lower ends aligned edge to edge on the same level, contact points on said aligned lower ends, a supportingblock of insulation naving a face lying substantially iush with the front faces of the lower ends of said strips, said strips having offset Vportions above the Contact points disposed withinl and moulded in the body of in sulation to hold the strips in xed positioirand having upwardly extending portions providing terminals.
  • a stationary contact assembly comprising a series of thin nat metallic strips having their lower ends disposed in parallelism edge to edge, contacts of erosion resisting metal mounted on said lower ends, a flat block of insulation forming a support for said strips, said blockhaving an edge face Vsubstantially ilush with the outer sur.- i'aces of said lower ends of the metallic strips, each of said strips having a part of its ⁇ length offset into and embraced by and moulded in the material of the block of insulation and having an upwardly extending terminal portion.
  • a Contact member for a, multiple relay comprising a flat sided strip of tarnishresisting metal having a plate of precious metal upon the flat face at its lower end, said plate of precious metal being inset to besubstantially flush with the face of the strip and having a groove extending longitudinally of ⁇ the strip, the strip having a lateral loop adjacent its lower end forming an anchorage by which the member is adapted to be supported and having a laterally oiset terminal portion at its'upper end; said terminal portion having a notch for locating a connecting wire.
  • Multiple contact arrangement comprising a stationary contact element, a ilat narrow metallic strip fixedly supported in insulated relation, a contact plate of erosion resisting metal clad upon the face of the lower endY thereof, a groove formed in said contact'plate to provide ridges on opposite sides of the groove, a cooperating movable contact element cooperating with said stationary contact element, said ⁇ movable contact element comprising a narrow rigid metallic armature aligned longitudinally with said strip and having its inner end overlapping said contact plate, a slender spring wire reed-upon the outer end of which said armature is rigidly attached in longitudinal alignment, andra short piece of iine contact wire of an erosion resisting metal welded upon and across the upper overlapping end of the armature and lying transverse to the aforesaid ridges on the stationary contact, said wire reed being adapted to be ilexedlongitudinally to bring said contact Wire into engagement with said contact plate and adapted to be twisted iii-neces
  • Contact means comprising a series of coplanar edge to edge metallic strips of graduated length, said strips havingtheir lower Contact ends disposed in alignment and having looped portions extending out of the plane of the bodies of the strips, a bar of insulation moulded about said loops and substantially flush with the outer faces of the strips and leaving the lower contact ends and the upper ends of said strips free.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Electromagnets (AREA)
US492568A 1940-07-29 1943-06-28 Relay construction Expired - Lifetime US2409054A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL65720D NL65720C (xx) 1940-07-29
BE468621D BE468621A (xx) 1940-07-29
US492568A US2409054A (en) 1940-07-29 1943-06-28 Relay construction
US652335A US2550577A (en) 1940-07-29 1946-03-06 Relay construction
CH279786D CH279786A (de) 1940-07-29 1946-10-08 Elektromagnetische Vorrichtung.
FR934844D FR934844A (fr) 1940-07-29 1946-10-15 Construction de relais

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US348222A US2396332A (en) 1940-07-29 1940-07-29 Relay construction
US492568A US2409054A (en) 1940-07-29 1943-06-28 Relay construction
US652335A US2550577A (en) 1940-07-29 1946-03-06 Relay construction

Publications (1)

Publication Number Publication Date
US2409054A true US2409054A (en) 1946-10-08

Family

ID=27407815

Family Applications (2)

Application Number Title Priority Date Filing Date
US492568A Expired - Lifetime US2409054A (en) 1940-07-29 1943-06-28 Relay construction
US652335A Expired - Lifetime US2550577A (en) 1940-07-29 1946-03-06 Relay construction

Family Applications After (1)

Application Number Title Priority Date Filing Date
US652335A Expired - Lifetime US2550577A (en) 1940-07-29 1946-03-06 Relay construction

Country Status (5)

Country Link
US (2) US2409054A (xx)
BE (1) BE468621A (xx)
CH (1) CH279786A (xx)
FR (1) FR934844A (xx)
NL (1) NL65720C (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2543000A (en) * 1946-03-12 1951-02-27 Int Standard Electric Corp Plug-in relay
US2758173A (en) * 1954-03-22 1956-08-07 Iron Fireman Mfg Co Electric circuit chopper

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US322139A (en) * 1885-07-14 System of electric distribution
US1082310A (en) * 1911-03-31 1913-12-23 Automatic Electric Co Relay.
US1318178A (en) * 1916-10-25 1919-10-07 Philip W Goewey Circuit-controller.
US1462585A (en) * 1917-11-24 1923-07-24 Briggs & Stratton Company Armature construction
US1521591A (en) * 1921-06-20 1925-01-06 Western Electric Co Electromagnetic device
GB468974A (en) * 1935-01-25 1937-07-16 Bruno Piesker Improvements in or relating to electromagnetic relays
US2423524A (en) * 1941-12-01 1947-07-08 Brown Instr Co Vibrator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2543000A (en) * 1946-03-12 1951-02-27 Int Standard Electric Corp Plug-in relay
US2758173A (en) * 1954-03-22 1956-08-07 Iron Fireman Mfg Co Electric circuit chopper

Also Published As

Publication number Publication date
FR934844A (fr) 1948-06-02
NL65720C (xx)
CH279786A (de) 1951-12-15
US2550577A (en) 1951-04-24
BE468621A (xx)

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