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US1696223A - Electromagnetic device - Google Patents

Electromagnetic device Download PDF

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Publication number
US1696223A
US1696223A US714996A US71499624A US1696223A US 1696223 A US1696223 A US 1696223A US 714996 A US714996 A US 714996A US 71499624 A US71499624 A US 71499624A US 1696223 A US1696223 A US 1696223A
Authority
US
United States
Prior art keywords
frame
winding
electromagnetic device
terminal
relays
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
US714996A
Other languages
English (en)
Inventor
James A Wotton
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
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Priority to US714996A priority Critical patent/US1696223A/en
Priority to DEW69408D priority patent/DE475290C/de
Application granted granted Critical
Publication of US1696223A publication Critical patent/US1696223A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
    • H04M1/745—Protection devices or circuits for voltages surges on the line

Definitions

  • This invention relates to electromagnetic devices and particularly to electromagnetic relays for use in party line telephone systems.
  • An object of the invention is to make certain improvements in the construction of such relays whereby damage by high voltage discharges ma be prevented.
  • a feature 0 the invention is a connection constituting a path of low impedance between the winding and the frame whereby the air gap path between these points is short cir-- cuited.
  • igs. 1 and 2 are side and front views respectively showing the arts of the relay embodying the invention.
  • Fig. 3 illustrates a four-party selective ringing system in which the relay embodying the invention is to be used. However, it will be understood that these relays may also be employed in other party selective ringing systems other: than the one herein described.
  • the heads of the magnet spool are formed of square and round insulating blocks 14 and 15 respectively, which fit closely within the space provided by the two extensions of the frame 12.
  • the upper extremities of the frame are secured to the opposite sides of the block 14 by screws 16.
  • This block or head 14 carries two posts 17 and 17' which are covered with felt and which are located in predetermined positions for forming limiting stops for the movement of the inverted u shaped armature 18 which is pivoted to the lower part of the frame by screws 19.
  • the insulating block 14 also carries a terminal 20 to which is connected one end of the magnet winding.
  • the other end of the winding 20 is connected to the terminal member 21 which is fastened to the frame 12 by the screws 22.
  • a winding terminals connected with the opposite ends of said winding, a metallic frame surrounding said winding, a grounded contact member mounted upon and a short distance from said frame but insulated therefrom, and a connection between one of said terminals and said frame whereby high potential surges flowing into said winding will be shunted from the winding over the gap between said frame and said contact member to ground.
  • a winding a metallic frame surrounding said winding, one end of said winding being connected to said frame, and a terminal'mounted in close proximity to said frame so as to form an air gap between said terminal and said frame of a predetermined value such that the impedanceof said air gap is less than the impedance of any other path between said winding and the said frame.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Electromagnets (AREA)
US714996A 1924-05-22 1924-05-22 Electromagnetic device Expired - Lifetime US1696223A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US714996A US1696223A (en) 1924-05-22 1924-05-22 Electromagnetic device
DEW69408D DE475290C (de) 1924-05-22 1925-05-21 Anordnung zum Schutze von Apparaten gegen Hochspannung, insbesondere in Fernsprechanlagen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US714996A US1696223A (en) 1924-05-22 1924-05-22 Electromagnetic device

Publications (1)

Publication Number Publication Date
US1696223A true US1696223A (en) 1928-12-25

Family

ID=24872291

Family Applications (1)

Application Number Title Priority Date Filing Date
US714996A Expired - Lifetime US1696223A (en) 1924-05-22 1924-05-22 Electromagnetic device

Country Status (2)

Country Link
US (1) US1696223A (de)
DE (1) DE475290C (de)

Also Published As

Publication number Publication date
DE475290C (de) 1929-04-22

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