US3480901A - Fuse unit having an operation indicator - Google Patents

Fuse unit having an operation indicator Download PDF

Info

Publication number
US3480901A
US3480901A US675667A US3480901DA US3480901A US 3480901 A US3480901 A US 3480901A US 675667 A US675667 A US 675667A US 3480901D A US3480901D A US 3480901DA US 3480901 A US3480901 A US 3480901A
Authority
US
United States
Prior art keywords
disc
fuse unit
fuse
indicator
striker pin
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
US675667A
Other languages
English (en)
Inventor
Eric Jacks
Charles Rowe
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.)
English Electric Co Ltd
Original Assignee
English Electric Co 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 English Electric Co Ltd filed Critical English Electric Co Ltd
Application granted granted Critical
Publication of US3480901A publication Critical patent/US3480901A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/30—Means for indicating condition of fuse structurally associated with the fuse
    • H01H85/303—Movable indicating elements

Definitions

  • This invention relates to fuse units, and more particularly relates to fuse units having means for providing an indication of a fusible element having ruptured.
  • the present invention consists in a fuse unit having a striker pin operable upon rupture of the fusible element to eject a disc indicator from the body of the fuse unit and provide thereby an indication of its operation.
  • the disc indicator may normally be held on the end of the fuse unit body by a spring clip or by frictional engagement, and in order to limit the travel of the ejected disc it may be captively held by a length of cord.
  • a fuse unit according to this invention thus provides a more positive and readily identifiable means of indicating a fuse which has blown, and the design is such that it may readily be incorporated in existing fuse units having striker pins without modification.
  • FIGURES 1 and 2 illustrate axial sections through two different forms of indicating members retained in position on the end of a fuse unit.
  • FIGURE 1 there is shown the end portion of a fuse unit having a striker pin 3 mounted with its head lying close to an end cap 4 secured to the tubular wall 5 of the fuse unit body.
  • the end cap has a centrally disposed recess or well in which is secured a tubular spring clip 6 which itself grips an indicator disc 7.
  • the spring clip has a number of sharply pointed prongs 8 which extend outwardly through windows” 9 so as to engage tightly the Walls of the well and prevent withdrawal of the clip, and in addition includes a number of inwardly extending fingers 10 which embrace an inner lip 11 on the disc 7 and retain it in place.
  • This assembly thus ensures that the indicator disc cannot be accidentally dislodged.
  • the rupture of the fusible element results in the striker pin being driven through the end cap whereupon it strikes and ejects the disc 7, thus affording an indication of the fuse having blown.
  • FIGURE 2 there is shown an arrangement similar to that in FIGURE 1, but in this case the indicating disc has an inwardly extending tubular wall 12 which engages the inner walls of the well.
  • the tubular wall has a number of axially extending slots 13 formed therein, and it also accommodates a circlip 14 which outwardly biasses this wall 12 against the inner walls of the well, thus ensuring the retention of the disc.
  • cord may be fastened between the disc and the end cap, and in the FIGURE 2 embodiment it may be secured to the circlip 14 in the disc.
  • the cord instead of fastening the cord to the end cap it may conveniently be secured to another circlip located in the base of the well and outwardly biassed against its walls.
  • the indication may be assisted by providing a coloured or reflective material on the outer and/ or inner face of the disc, or on the faces of the well in the end cap so that it will be exposed when the disc is ejected.
  • a reflective material in this manner will particularly assist in the identification of a blown fuse in darkness.
  • the disc 7 may conveniently be made from a light plastics material, e.g. nylon, but in order to prevent the striker pin from piercing this material a metallic plate may be located on the inner side of the disc at the position of impact.
  • a light plastics material e.g. nylon
  • a fuse unit comprising a fusible element supported within a tubular body of insulating material between two conductive terminals, a striker pin indicator comprising an end cap secured to one end of the body and defining an axially recessed wall portion having a colored or reflective surface,
  • striker pin housed within, and extending axially of the body, the striker pin being secured to the fusible element under tension and operable upon rupture of the element to be projected through one of the end caps,
  • a fuse unit according to claim 1, wherein the indicator is in the form of a shouldered disc and includes a spring clip outwardly biassing the disc shoulders into frictional engagement with the recessed Wall portion of the cap.
  • a fuse unit according to claim 1 comprising a spring clip outwardly biassed into frictional engagement with the recessed wall portion of the cap, the indicator being in the form of a plain disc held by said spring clip.

Landscapes

  • Fuses (AREA)
  • Mechanical Operated Clutches (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Basic Packing Technique (AREA)
US675667A 1966-10-14 1967-10-16 Fuse unit having an operation indicator Expired - Lifetime US3480901A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB46051/66A GB1166848A (en) 1966-10-14 1966-10-14 Improvements in Fuselinks

Publications (1)

Publication Number Publication Date
US3480901A true US3480901A (en) 1969-11-25

Family

ID=10439659

Family Applications (1)

Application Number Title Priority Date Filing Date
US675667A Expired - Lifetime US3480901A (en) 1966-10-14 1967-10-16 Fuse unit having an operation indicator

Country Status (3)

Country Link
US (1) US3480901A (es)
ES (1) ES149969Y (es)
GB (1) GB1166848A (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170209884A1 (en) * 2014-07-31 2017-07-27 Hewlett-Packard Development Company, L.P. Visual performance information of an ejection device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5055818A (en) * 1989-11-30 1991-10-08 Cooper Industries, Inc. Flagged blown fuse indicator
FR2795551B1 (fr) * 1999-06-25 2001-08-03 Alstom Fusible moyenne tension avec une signalisation visuelle de la coupure du fusible

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1081214A (en) * 1912-01-02 1913-12-09 Chase Shawmut Co Inclosed electric fuse.
US1144732A (en) * 1907-04-03 1915-06-29 Edmund O Schweitzer Fuse device.
US2333354A (en) * 1940-03-06 1943-11-02 Electric Transmission Ltd Electric fuse of cartridge type
US3263048A (en) * 1963-07-10 1966-07-26 E M P Electric Ltd Trip devices for electric fuses

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1144732A (en) * 1907-04-03 1915-06-29 Edmund O Schweitzer Fuse device.
US1081214A (en) * 1912-01-02 1913-12-09 Chase Shawmut Co Inclosed electric fuse.
US2333354A (en) * 1940-03-06 1943-11-02 Electric Transmission Ltd Electric fuse of cartridge type
US3263048A (en) * 1963-07-10 1966-07-26 E M P Electric Ltd Trip devices for electric fuses

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170209884A1 (en) * 2014-07-31 2017-07-27 Hewlett-Packard Development Company, L.P. Visual performance information of an ejection device
US10335819B2 (en) * 2014-07-31 2019-07-02 Hewlett-Packard Development Company, L.P. Visual performance information of an ejection device

Also Published As

Publication number Publication date
ES149969Y (es) 1970-06-16
GB1166848A (en) 1969-10-08
ES149969U (es) 1969-11-16

Similar Documents

Publication Publication Date Title
US4586570A (en) Combination seal and locking pin
US4281888A (en) Apparatus for testing leads of fuse holders
US3480901A (en) Fuse unit having an operation indicator
JPS6364278A (ja) 避雷装置用インディケ−タ
US2105286A (en) Dkcuit breaker
WO1998002348A2 (en) Gas cartridge safety inflator apparatus
US3190987A (en) Protectors for electric circuits
US2851558A (en) Fuse holder
US4127837A (en) Indicating device for fuse-links more particularly miniature fuse-links
US3268693A (en) Fuseholder
US5055818A (en) Flagged blown fuse indicator
US5083114A (en) Ground fault indicating device
US3818755A (en) Testing tires
US7320286B2 (en) Setback switch for safe and arm
US2947829A (en) Safety fuse
US4012613A (en) Inertial switch
US2072290A (en) Automatic ejecting fuse
CA2137882A1 (en) Striker pin device for an electric fuse
US1849917A (en) Indicating fuse-plug
US2901694A (en) Screw driver fuse tester
US2270226A (en) Alarm means
CN116850608B (zh) 降落伞自动触发系统、模型火箭
US2206786A (en) Indicating plug fuse
US1101946A (en) Indicating electric fuse-plug.
US2244532A (en) Fuse holder