GB696221A - Improvements in and relating to electro-magnetic time delay tripping units - Google Patents

Improvements in and relating to electro-magnetic time delay tripping units

Info

Publication number
GB696221A
GB696221A GB1900850A GB1900850A GB696221A GB 696221 A GB696221 A GB 696221A GB 1900850 A GB1900850 A GB 1900850A GB 1900850 A GB1900850 A GB 1900850A GB 696221 A GB696221 A GB 696221A
Authority
GB
United Kingdom
Prior art keywords
plunger
electro
july
relating
magnetic material
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
Application number
GB1900850A
Inventor
Herbert Werner Wolff
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.)
Dorman & Smith Ltd
Original Assignee
Dorman & Smith Ltd
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 Dorman & Smith Ltd filed Critical Dorman & Smith Ltd
Priority to GB1900850A priority Critical patent/GB696221A/en
Publication of GB696221A publication Critical patent/GB696221A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/44—Automatic release mechanisms with or without manual release having means for introducing a predetermined time delay
    • H01H71/443—Automatic release mechanisms with or without manual release having means for introducing a predetermined time delay with dash-pot

Abstract

696,221. Electrically-tripped switches. DORMAN & SMITH, Ltd. July 13, 1951 [July 31, 1950], No. 19008/50. Class 38 (v) [Also in Group XXXII] The plunger 2 of an electro-magnetic time-delay tripping unit is made of magnetic material, is mounted wholly in an enclosed cylinder 1 and incorporates means 7, 8 to permit fluid to pass through or past the plunger during its inward movement (under the action of a spring 5), more quickly than during its movement in the reverse direction. The cylinder 1 is of non-magnetic material and constitutes the fixed core of a solenoid in an electrical cuicuit controlling the tripping mechanism. In operation, when the current in the solenoid reaches a certain value, the soft iron plunger 2 is magnetically attracted upwardly until it effects the trip by attraction of an external armature (not shown). The plunger then descends rapidly to its inoperative position.
GB1900850A 1950-07-31 1950-07-31 Improvements in and relating to electro-magnetic time delay tripping units Expired GB696221A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1900850A GB696221A (en) 1950-07-31 1950-07-31 Improvements in and relating to electro-magnetic time delay tripping units

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1900850A GB696221A (en) 1950-07-31 1950-07-31 Improvements in and relating to electro-magnetic time delay tripping units

Publications (1)

Publication Number Publication Date
GB696221A true GB696221A (en) 1953-08-26

Family

ID=10122210

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1900850A Expired GB696221A (en) 1950-07-31 1950-07-31 Improvements in and relating to electro-magnetic time delay tripping units

Country Status (1)

Country Link
GB (1) GB696221A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4529326A (en) * 1981-01-19 1985-07-16 Facit Aktiebolag Print hammer for printers and typewriters
EP0468272A2 (en) * 1990-07-26 1992-01-29 Licentia Patent-Verwaltungs-GmbH Electrical switching device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4529326A (en) * 1981-01-19 1985-07-16 Facit Aktiebolag Print hammer for printers and typewriters
EP0468272A2 (en) * 1990-07-26 1992-01-29 Licentia Patent-Verwaltungs-GmbH Electrical switching device
EP0468272A3 (en) * 1990-07-26 1992-12-30 Licentia Patent-Verwaltungs-Gmbh Electrical switching device

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