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US2481893A - Electric fuse - Google Patents

Electric fuse Download PDF

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Publication number
US2481893A
US2481893A US764453A US76445347A US2481893A US 2481893 A US2481893 A US 2481893A US 764453 A US764453 A US 764453A US 76445347 A US76445347 A US 76445347A US 2481893 A US2481893 A US 2481893A
Authority
US
United States
Prior art keywords
contacts
fuse
holder
stems
base
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
US764453A
Other languages
English (en)
Inventor
Wilcox Edward
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.)
Edward Wilcox & Co Ltd
Original Assignee
Edward Wilcox & 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 Edward Wilcox & Co Ltd filed Critical Edward Wilcox & Co Ltd
Application granted granted Critical
Publication of US2481893A publication Critical patent/US2481893A/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
    • H01H85/54—Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers
    • H01H85/56—Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers the intermediate or auxiliary part having side contacts for plugging into the base, e.g. bridge-carrier type
    • 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
    • H01H85/54—Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers
    • H01H85/542—Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers the intermediate or auxiliary part being provided with bayonet-type locking means

Definitions

  • rSlhis invention has reference to electric fuses of the kind comprising a fuse bridge or holder provided with 4contacts across which a cartridge fuse is connected, and a :base provided with complemen-tary contacts with which the contacts on the bridge -or holder are' adapted to be engaged Iwhen the latter is inserted into the base.
  • the object of the invention is to provide in an electric fuse of the kind referred to, improved means of securing the ⁇ cartridge fuse between the vcontacts on the bridge or holder and also securing the contacts on the bridge or holder.
  • the contacts on the fuse bridge or holder of an electric fuse of the kind referred to have associated with them screwed stems which screw through tapped holes in the contacts and are slidably mounted in abutments on the bridge or holder and the cartridge fuse is inserted between said stems, the screwing up of :one or both of which yclamps the fuse between the stems and also clamps the lcontacts against said abutments.
  • Fig. 1 is a ⁇ section of the base of the fuse
  • Fig. 2 is a section of the fuse bridge or holder
  • Fig. 3 is an elevation looking on the right hand side of Fig. 1,
  • Fig. 4 is an elevation looking on the left hand side of Fig. 2,
  • Fig. 5 is a section on the line V-V in Fig. 1,
  • Fig. 6 is a section on the line VI-VI in Fig. 2,
  • Fig. '7 is a perspective view of the two contacts mounted on the base
  • Fig. 8 is a perspective View of vone of the contacts mounted on the fuse bridge or holder
  • Fig. 9 is a section showing the fuse bridge or holder tted in the base and interlocked therein,
  • Fig. 10 is a section on the line X-X in Fig. 9, and
  • Fig. 11 is a fragmentary section of the fuse bridge or holder illustrating a modication of a detail hereinafter more particularly referred to.
  • I2 is the base of the electric fuse and I3 is the fuse holder both made of insulating material as is usual.
  • the base l2 has mounted on it in recesses I4, Ida, tubular contacts I5, 15a formed with wideslots I6, l6a of width only slightly less than the full internal diameter of the contacts, and with narrow slots I'I, Ila as described in British patent specication No. 544,122.
  • the contacts I5, 15a are secured on the base by clamping screws I8, 18a and bushes IS, I9a of insulating material which are screwed into the ends of the base.
  • the screws I8, I 8a also serve to clamp the ends of the conductors which pass through the bushes I9, 19a into the bores 20, 20a of the contacts I5.
  • the fuse bridge or holder I3 is ⁇ formed with sleeves 2l, 2Ia in the .opposing ends of which are seated the enlarged looped ends 22, 22a of resilient bifurcated contacts 23, 23a.
  • the ends 22, 22a, of .the contacts 23, 23a are tapped to receive screw threaded tubular stems 24, 24a.
  • the screwed stem 24 has nxed on it a sleeve 25 of insulating material which is freely rotatable and slidable in the sleeve 2I .and is provided with an operating piece 26 by means of which it and the stem may be rotated.
  • the screwed stem 24a has xed on it a reel 33 .of insulating material which is a free t in the sleeve 2 Ia.
  • the ends 22, 22a of the contacts 23, 23a are formed with projections 2l, 21a which take into recesses 28, 28a formed in the walls of the .sleeves 21
  • the opposing ends of the screwed stems 24, 24a are concaved or internally coned to receive the correspondingly convexed, domed or coned conducting caps 30, 30a on the ends of a cartridge fuse 3I which is mounted between the stems.
  • the stem 24 is slackened back a little, the fuse is interposed between the stems and the stem 24 is screwed up, whereupon the fuse is centred and clamped between the stems in electrical connection with the contacts 23, 23a. Simultaneously, the contact 23a is pressed against its seat in the end of the sleeve 2 Ia and the contact 23 is drawn against its seat in the end of the sleeve 2 I.
  • the notches 29, 29a, in which the limbs of the contacts 23, 23a are received prevent undue spreading of the members of the limbs by the screwing of the stems 24, 24a into the ends 22, 22a of the contacts.
  • the cartridge fuse 3l mounted across the contacts 23, 23a on the holder I3 is electrically connected across the contacts I5, I5a on the base I2, and the contacts on the holder and the base are interlocked, by rst entering the forward or free ends 32, 32a of the contacts 23, 23a into the contacts I5, I5a through the wide slots I6, ISa and then moving the holder longitudinally relatively to the base to carry the limbs of the holder contacts 23, 23a into the narrow slots II, IIa in the base contacts I5, I5a. Reverse movement of the holder breaks the interlock and allows of the holder being withdrawn from the base.
  • the ends 32, 32a of the holder contacts 23, 23a are normally of slightly greater width than the internal diameter of the base contacts I5, I5a so that when forced through the slots I6, Ilia the ends 32, 32a enter the contacts I5, I5a with a snap action and the limbs of the contacts 23, 23a are also pressed together therein, thus ensuring good electrical contact between the two sets of contacts.
  • the pressing together of the limbs of the holder contacts 23, 23a also has the effect of binding the enlarged. rear ends 22, 22a of the contacts on the stems 24, 24a.
  • cartridge fuse comprises one or more pieces of fuse wire contained in the fuse cartridge and clamped by the conducting caps 3U,
  • a supply of spare fuse wire may be wound on the reel 33 for use as required.
  • the reel 33 also serves as an operating piece for adjusting the stem 24a in the end 22a of the contact 23a.
  • the stem 24a may have xed on it an insulating sleeve 25a furnished with an operating piece 26a (as shown in Fig. 11) so that either stem may be adjusted to clamp and release the cartridge fuse 3
  • the holder I3 may have in it a sight hole 34, Fig. 2, tted with a pane of transparent material 35 through which can be seen whether or not a cartridge fuse is in position without removing the holder from the base.
  • bridge or holder contacts are not bifurcated or the rear ends of the contacts are not looped, such ends of the contacts may be made with bosses for the formation of the tapped holes for the clamping stems 24, 24a.
  • springs or spring washers may be arranged on the stems 24, 24a. between the contacts 23, 23a. and the adjacent sleeves 2I, 2Ia, which springs or spring washers tend to press the contacts towards each other and are compressed when the contacts are drawn towards the sleeves by the screwing up of the stems.
  • springs or spring washers may be arranged on the stems 24, 24a. between the contacts 23, 23a. and the adjacent sleeves 2I, 2Ia, which springs or spring washers tend to press the contacts towards each other and are compressed when the contacts are drawn towards the sleeves by the screwing up of the stems.
  • springs may be arranged in the bores of the sleeves between the outer ends of or collars on the stems and plugs screwed into the sleeves, the screwing up of the plugs causing the springs to force the front ends of the stems into yielding engagement with the conducting caps 30, 30a on the ends of the cartridge fuse 3I.
  • a contact bridge member for electric fuses comprising an insulating holder having axially alined tubular ends and an intermediate connecting portion, two contact members each of approximately U-shape and having their closed ends in the form of an internally screw threaded circular loop, one contact member being disposed against the inner face of each tubular end of the holder and free for axial movement, and two screw stems, one screw stem being entered into each tubular end of the holder and screwing into the loop of the adjacent contact member and the two stems being adapted to engage the opposing ends of a fuse inserted between them alongside the said intermediate connecting portion.
  • a Contact bridge member as claimed in claim 1 in which key means are provided to restrain the contact members angularly.
  • a contact bridge member as claimed in claim 1 in which the free ends of the contact members are received and spaced in axial slots in the respective tubular ends of the holder.
  • a contact bridge member as claimed in claim 1 in which key means are provided to restrain the 4contact members angularly and in which the free ends of the contact members are received in axial slots in the respective tubular ends of the holder.

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  • Fuses (AREA)
US764453A 1944-02-02 1947-07-29 Electric fuse Expired - Lifetime US2481893A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2481893X 1944-02-02

Publications (1)

Publication Number Publication Date
US2481893A true US2481893A (en) 1949-09-13

Family

ID=10908041

Family Applications (1)

Application Number Title Priority Date Filing Date
US764453A Expired - Lifetime US2481893A (en) 1944-02-02 1947-07-29 Electric fuse

Country Status (2)

Country Link
US (1) US2481893A (fr)
BE (1) BE479478A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973497C (de) * 1950-10-14 1960-05-12 Hazeltine Corp Fernsehsystem
US3056870A (en) * 1959-01-26 1962-10-02 Frank Adam Electric Co Fuse switch
US3743761A (en) * 1971-08-10 1973-07-03 Gen Electric High voltage rectifier holder
US4768978A (en) * 1984-10-27 1988-09-06 R.Stahl Schaltgerate Gmbh Coded fuse and fuse holder
EP2061063A1 (fr) 2007-11-16 2009-05-20 AMPHENOL-TUCHEL ELECTRONICS GmbH Système de réception pour la réception d'un connecteur
WO2009062625A1 (fr) * 2007-11-16 2009-05-22 Amphenol-Tuchel Electronics Gmbh Dispositif de positionnement pour le logement d'un connecteur enfichable

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1180659A (en) * 1914-06-05 1916-04-25 Firm Robert Bosch Junction-box for electric circuits.
US1657799A (en) * 1925-08-22 1928-01-31 Chicago Fuse Mfg Co Electrical attachment plug
GB544122A (en) * 1941-01-01 1942-03-27 Edward Wilcox Improvements in or relating to electric fuses

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1180659A (en) * 1914-06-05 1916-04-25 Firm Robert Bosch Junction-box for electric circuits.
US1657799A (en) * 1925-08-22 1928-01-31 Chicago Fuse Mfg Co Electrical attachment plug
GB544122A (en) * 1941-01-01 1942-03-27 Edward Wilcox Improvements in or relating to electric fuses

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973497C (de) * 1950-10-14 1960-05-12 Hazeltine Corp Fernsehsystem
US3056870A (en) * 1959-01-26 1962-10-02 Frank Adam Electric Co Fuse switch
US3743761A (en) * 1971-08-10 1973-07-03 Gen Electric High voltage rectifier holder
US4768978A (en) * 1984-10-27 1988-09-06 R.Stahl Schaltgerate Gmbh Coded fuse and fuse holder
EP2061063A1 (fr) 2007-11-16 2009-05-20 AMPHENOL-TUCHEL ELECTRONICS GmbH Système de réception pour la réception d'un connecteur
WO2009062625A1 (fr) * 2007-11-16 2009-05-22 Amphenol-Tuchel Electronics Gmbh Dispositif de positionnement pour le logement d'un connecteur enfichable
US20100311271A1 (en) * 2007-11-16 2010-12-09 Wolfgang Langhoff Receiving device for accommodating a connector
US8079866B2 (en) 2007-11-16 2011-12-20 Amphenol-Tuchel Electronics Gmbh Receiving device for accommodating a connector

Also Published As

Publication number Publication date
BE479478A (fr)

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