US3735313A - Fuse plug for electrical installations - Google Patents

Fuse plug for electrical installations Download PDF

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Publication number
US3735313A
US3735313A US00255072A US3735313DA US3735313A US 3735313 A US3735313 A US 3735313A US 00255072 A US00255072 A US 00255072A US 3735313D A US3735313D A US 3735313DA US 3735313 A US3735313 A US 3735313A
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US
United States
Prior art keywords
fuse plug
sleeves
spring
outer sleeve
fuse
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
US00255072A
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English (en)
Inventor
A Heyerdahl
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Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US3735313A publication Critical patent/US3735313A/en
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
    • 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
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/143—Electrical contacts; Fastening fusible members to such contacts
    • H01H85/15—Screw-in contacts

Definitions

  • a fuse plug for electrlcal lnstallatlons one contact member of which is formed as two cylindrical, con- [30]
  • Foreign Application Priority Data centric metal sleeves slidably one upon the other against a spring between the sleeves.
  • the sleeves are May 21, 1971 Norway ..l9l l /71 lockable together in tensioned condition and a release member axially slidable in the sleeves is pushed into [52] US. Cl. ..337/268, 337/251, 337/413 the Sleeves when disposing the fuse plug into a holder [5 l] "Holh 85/16 for the fuse plug, and thereby releases instantaneously [58] Field of Search ..337/159, 173, 180,
  • the invention relates to a fuse plug for electrical installations, with resilient contact between the contact members of the fuse plug and corresponding contact members in a holder for the fuse plug, the said fuse plug comprising a body of insulating material which supports two contact members and a disconnecting means therebetween for overloading.
  • a fuse plug of this type is known from German Pat. No. 884,672; this has a disadvantage, however, that while screwing the fuse plug into the holder, a spark is generated due to the fact that the contact surfaces are not in plane parallel, the said spark causing burn damage and oxidization of the contact surfaces, which in turn leads to increased transfer resistance and undesirable heating.
  • the object of the invention is therefore to provide a fuse plug of the type described introductorily, whereby the said disadvantage is eliminated or reduced to a substantial degree, in that the spring effect is automatically released and brings the contact surfaces together instantaneously.
  • one contact member of the fuse plug is formed as two cylindrical, concentric metal sleeves slidable one upon the other, the inner sleeve being with one end rigidly connected to the insulating body, the other end of the sleeve forming engagement for one end of a spring the other end of which bears against the free end of the outer sleeve, and in that the spring is maintained in tensioned state and is releasable by means of a combined locking and releasing mechanism.
  • the combined locking and releasing mechanism consists preferably of a hollow casing of insulating material which is axially displaceable within the two sleeves and adapted to project through a central opening in the two sleeves, the cavity of the casing receiving the central portion of a hairpin spring the ends of which are bent away from one another and adapted to project through suitable openings in the inner respectively the outer sleeve, and to bear against a plate which is engaged by a spring supported against the insulating body.
  • the inner sleeve is provided with a slot extending parallel to the axis of the sleeve and, from the peripheral surface of the outer sleeve, a tongue is bent inwardly and engages in the slot.
  • FIG. I shows in diagram an axial section through a fuse plug according to the invention in released condition.
  • FIG. 2 shows a part of the fuse plug on FIG. 1 in locked condition.
  • the fuse plug according to the embodiment example consists of a cylindrical, ceramic body 1 having a central opening 2 which has, at the lower end on the drawing, a portion 3 with larger diameter.
  • the body 1 provided with a contact member 4 which, by means of a fuse wire 5 is electrically connected to a casing 6 which is secured in the portion 3 in the body 1.
  • a cylindrical metal sleeve 7 is, at the upper end thereof on the drawing, secured to the body 1 and the casing 6.
  • an outer sleeve 8 is slidably arranged with-electrical slide contact and, between the bottoms of the inner and outer sleeve, a helical spring 18 is arranged which, in working condition of the fuse plug, exerts the necessary contact pressure.
  • a slot 17, parallel to the axis, is provided in the peripheral surface of the inner sleeve, in which slot, a tongue 16, inwardly bent from the peripheral surface of the outer sleeve, engages and restricts the movement of the outer sleeve.
  • a hollow casing 9 of insulating material is displaceably ar ranged and, in the cavity at the central portion thereof, a hairpin spring 11 is arranged the ends of which are bent away from one another so that they bear against a plate 13 which is engaged by a helical spring 12 disposed in the casing 6.
  • a helical spring 12 disposed in the casing 6.
  • the fuse plug is screwed into its holder and the free end of the casing 9 initially prevents the outer sleeve from touching the contact member in the holder, however, on further screwing, the inner end of the casing 9, on being pressed in, will press the legs of the hairpin spring toward each other so that the free ends thereof are pulled back from the openings 14, 15 and, under pressure from the spring, the outer sleeve is brought into instantaneous contact with the contact member in the holder.
  • Fuse plug for electric installations having resilient engagement between the contact members of the fuse plug and corresponding contact members in a holder for the fuse plug, the said fuse plug comprising a body of insulating material which supports two contact members and has a disconnecting means therebetween for overloading, characterized in that one contact member of the fuse plug is formed as two cylindrical, concentric metal sleeves (7, 8), slidable one upon the other, the inner sleeve 7 being rigidly connected at one end to the insulating body (1) and forming with its other end engagement for one end of a spring (18) the other end of which bears against the free end of the outer sleeve (8), and in that the spring is held in tensioned condition and is releasable by means of a combined locking and releasing mechanism.
  • Fuse plug according to claim 1 characterized in that the combined locking and releasing mechanism consists of a hollow casing (9) of insulating material which is axially displaceable within the two sleeves (7, 8) and is adapted to project through a central opening in the two sleeves, the cavity of the said casing receiving the central portion of a hairpin spring (11) the ends of which are bent away from one another and adapted to project through suitable openings (14 respectively 15) in the inner respectively the outer sleeve, and bear against a plate (13) which is engaged by a spring (12) supported against the insulating body (1).
  • the combined locking and releasing mechanism consists of a hollow casing (9) of insulating material which is axially displaceable within the two sleeves (7, 8) and is adapted to project through a central opening in the two sleeves, the cavity of the said casing receiving the central portion of a hairpin spring (11) the ends of which are bent away from one another and adapted to project through suitable openings (14 respectively 15) in the inner respectively the outer sle
  • Fuse plug according to claim 2 characterized in that the inner sleeve (7) is provided with a slot (17) extending parallel to the axis thereof, and that, from the peripheral surface (8) of the outer sleeve, a tongue (16) is bent inwardly and engages in the slot.

Landscapes

  • Fuses (AREA)
US00255072A 1971-05-21 1972-05-19 Fuse plug for electrical installations Expired - Lifetime US3735313A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO01911/71A NO126888B (enExample) 1971-05-21 1971-05-21

Publications (1)

Publication Number Publication Date
US3735313A true US3735313A (en) 1973-05-22

Family

ID=19878514

Family Applications (1)

Application Number Title Priority Date Filing Date
US00255072A Expired - Lifetime US3735313A (en) 1971-05-21 1972-05-19 Fuse plug for electrical installations

Country Status (13)

Country Link
US (1) US3735313A (enExample)
AT (1) AT312082B (enExample)
BE (1) BE783749A (enExample)
CA (1) CA965133A (enExample)
CH (1) CH555593A (enExample)
DD (1) DD99481A5 (enExample)
DK (1) DK130668B (enExample)
FR (1) FR2138720B1 (enExample)
GB (1) GB1393996A (enExample)
IT (1) IT955696B (enExample)
NL (1) NL7206809A (enExample)
NO (1) NO126888B (enExample)
SE (1) SE375404B (enExample)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2902568A (en) * 1958-08-01 1959-09-01 James E Way Fuses
US3178540A (en) * 1961-04-17 1965-04-13 Atlas Chem Ind Electrical switch having deformable contact members
US3180957A (en) * 1960-07-29 1965-04-27 Ite Circuit Breaker Ltd Auxiliary contact device with deformable contact operated by an explosive

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2902568A (en) * 1958-08-01 1959-09-01 James E Way Fuses
US3180957A (en) * 1960-07-29 1965-04-27 Ite Circuit Breaker Ltd Auxiliary contact device with deformable contact operated by an explosive
US3178540A (en) * 1961-04-17 1965-04-13 Atlas Chem Ind Electrical switch having deformable contact members

Also Published As

Publication number Publication date
CH555593A (de) 1974-10-31
DK130668C (enExample) 1975-08-25
SE375404B (enExample) 1975-04-14
DK130668B (da) 1975-03-17
FR2138720B1 (enExample) 1979-02-09
DE2223006A1 (de) 1972-12-07
IT955696B (it) 1973-09-29
NO126888B (enExample) 1973-04-02
GB1393996A (en) 1975-05-14
AT312082B (de) 1973-12-10
DE2223006B2 (de) 1977-05-18
DD99481A5 (enExample) 1973-08-05
BE783749A (fr) 1972-09-18
FR2138720A1 (enExample) 1973-01-05
CA965133A (en) 1975-03-25
NL7206809A (enExample) 1972-11-23

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