CA1050592A - Miniature plug-in fuse and method of making same - Google Patents
Miniature plug-in fuse and method of making sameInfo
- Publication number
- CA1050592A CA1050592A CA217,829A CA217829A CA1050592A CA 1050592 A CA1050592 A CA 1050592A CA 217829 A CA217829 A CA 217829A CA 1050592 A CA1050592 A CA 1050592A
- Authority
- CA
- Canada
- Prior art keywords
- fuse
- plug
- housing
- forming
- blank
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H69/00—Apparatus or processes for the manufacture of emergency protective devices
- H01H69/02—Manufacture of fuses
-
- 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
- H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
- H01H85/0411—Miniature fuses
- H01H85/0415—Miniature fuses cartridge type
- H01H85/0417—Miniature fuses cartridge type with parallel side contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H69/00—Apparatus or processes for the manufacture of emergency protective devices
- H01H69/02—Manufacture of fuses
- H01H2069/027—Manufacture of fuses using ultrasonic techniques
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Fuses (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Miniature current overload fuses are provided of a type which, whether rated to carry only a few amperes or as much as 30 amperes, occupy only a fraction of the space occupied by conventional glass envelope cylindrical fuses. More specifically, the invention relates to a plug-in fuse element comprising a one-piece co-planar plate-like body of fuse metal which body comprises a pair of spaced generally parallel terminal-forming blade portions to be received by pressure clip terminals in a mounting panel, the terminal-forming blade portions having current-carrying extensions at the inner end portions thereof which are interconnected by a transversely extending fuse-forming link portion of much smaller cross-sectional area than said terminal-forming blade portions and the current carrying extensions thereof, said terminal-forming blade portions, current-carrying extensions at the inner end portions thereof and transversely extending fuse-forming link portion being substantially all in the same plane parallel to the outer faces of the plate-like body forming the same.
Miniature current overload fuses are provided of a type which, whether rated to carry only a few amperes or as much as 30 amperes, occupy only a fraction of the space occupied by conventional glass envelope cylindrical fuses. More specifically, the invention relates to a plug-in fuse element comprising a one-piece co-planar plate-like body of fuse metal which body comprises a pair of spaced generally parallel terminal-forming blade portions to be received by pressure clip terminals in a mounting panel, the terminal-forming blade portions having current-carrying extensions at the inner end portions thereof which are interconnected by a transversely extending fuse-forming link portion of much smaller cross-sectional area than said terminal-forming blade portions and the current carrying extensions thereof, said terminal-forming blade portions, current-carrying extensions at the inner end portions thereof and transversely extending fuse-forming link portion being substantially all in the same plane parallel to the outer faces of the plate-like body forming the same.
Description
5~1S~2 , BACKGROUND OF THE INVENTION
` ¦~ The present invention relates to miniature current ¦ overload fuses which, whether they are rated to carry only a few . ~ amperes or as much as 30 amperes, occupy a space which i5 only a : ~: fraction of the space occupied by the conventional glass envelope ; ~ ~yli~d i~:~l fu rs.
f , ~ . .
- ~
.
' ' .
. .
~05059Z -z ¦ An overload fuse capable of carrying currents of the above range of magnitudes commonly comprise a sealed cylindrical glass envelope with cylindrical terminals projecting from the ends t'hereof and a fuse link extending between the fuse terminals within the sealed cylindrical envelope. Fuses of this type having current ratings of 10-30 amperes commonly have lengths of the , ' order of magnitude of over one inch and, together with t'he mounting terminals wit'h whic'h they are associated, an overall ¦width of approximately one quarter inch and higher. Some of the disadvantages of this' type of fuse are the large space requirements for mounting the same and difficulty in removing ~hem~from mounting clip5. ' '"
I ~ ~ A marked~improvement in overload current fuses of ~ It'he rating referred to have been made in t'hat the fuse has a . ~ .
length well under 3/4 inc'h and a width of under 1/4 inch. Such a fuse is disclosed in U.S. Pat~nt No. 3,436,711. Also, t'he terminals of the improved fuses plug into socket openings transvsrsely to the length of ths fuss body, so ths socket connector can be a much less expensive and less bulky support mesns tb t thsn needed for conventional high curr~nt rot~d fuses.
' - 2 _ ' - ..' ,, l ...
......
- : . . ' ' ' . :
'--~
s~
While the miniature fuses heretofore developed have been a substantial improvement over the conventional cylindrical glass envelope fuses, they still left much to be desired from the standpoint of their cost of manu-facture and protection to the user. For example, in some of the miniature fuses heretofore developed, the fuse link was exposed so that the insertion thereof into a shorted circui-t would blow the same and spew fuse mater-~al onto the person Inserting the use. Also, it was possible for a person inserting or removing such a fuse to ~ake contact wIth the exposed fuse link which created a shock hazarcl if he engaged the fuse negligently.
While in one form of miniature fuse heretofore develop-ed, the ~use link was enclosed in a transparent housing having a handle extending from the outer walls thereof, the'fuse was relatively expensive to manufacture, it had less reliability than the fuse of the present inven- .
tion ! ,a,nd the ~use link was only visible on the side of . :
the housin~ because the handle obstructed a frontal view , thereof, so the ~use link could not ~e seen when the fuse was mounted between another pair of similar closely ~spaced ~uses on a'mounting panel. Also, the handle could not'be easily grasped due to the small clearance between a,djacent fuses.
' ' .
.
, ' cb/ ~ 3 , , .
It is, accordingly, one of the objects of the invention to provide a miniature fuse ~ith or without an enclosed fuse link and which is capable of carrying currents where desired well in excess of 10 amperes, suc~ as up to 30 amperes, and can be manufactured at a much smaller cost than the miniature fuses heretofore designed.
A related object of the invention is to pro-vide a miniature fuse having a housing providing an insulated gripping surface and a shield protecting the user from being contacted by t~e fuse material as an .....
inserted ~use ts blown~ and which further can be easily ~serted ;~nto or remoyed from an appropriate female connector on a mount 7 ng panel where the connectors are yery closel~ spaced, and also preferably wherein the ~use ~ink thereof ~s re~dil~ v~s~ble when the fuse i9 ~ounted ~ suc~ ~ ~ount~n~ panel.
In the mlniature fuses heretofore developed, :
the design of t~e fuses were such that the.external con- .:
~isur~tion and d~mensi.o~s of the fuses were identical for idely yary~ng current ratings thereof~ It was, therefore, xeadily possible for a fuse having a very ~igh current rating, suc~ as 2n-30 amperes, to ~e inadvertently placed into a connector associated with a circuit where the :-current rating may be ~rom 5-15 amperes, creating a very . .-hazardous o~erating condition. While these fuses were generally marked or color coded to indicate their fuse ratinys, the user could readily make a mistake by mis-reading the usually small current rating markings or com~
plicated color codes.
~ :
, . . . .
cb/ _ ~
.: -. ,,'',,'', ~' . . ' '. ' ,, ~,............... ....
, ,. .. , ' ' ';.. ",.. '" '.'; , '' : ' . ' ' ' ! ' . ~ , ~ . ~ . .
~L~5~%
Accordingly, another objec-t of the invention is to provide a fuse design where, although the different fuse assemblies have substantially identical configurations and size, the difference between relatively high and relatively low current rated fuses can be readily detected.
In most of the miniature fuse designs heretofore proposed, the terminals have cylindrical pin-like configura-tions moldedinto bases of insulating material, and the fuse ; links were soldered between the inner ends of these terminals.
` 10 The presence of solder connections sometimes crea-ted problems of reliability resulting from corrosion or hot spots due to poor solder connections or deterioration with age. Thus, another object of the present invention is to provide a miniature fuse having features satisfying one or more of the objectives previously discussed and, in addition, are -devoid of the corrosion or hot spot problems referred to.
SUMMARY OF THE FUSE LINK INVENTION
One aspect of the present invention may be broadly descrlbed as a plug-in fuse element comprising a one-piece plate-like body of fuse metal which body comprises a pair of juxtaposed, laterally spaced, generally parallel and coplanar terminal-forming blade portions to be received by pressure clip terminals in a mounting panel, the terminal-~-i, forming blade portions having current-carrying extensions at the inner end portions thereof which are interconnected by a fuse-forming lin~ portion of much smaller cross-sectional area than said terminal-forming blade portions and the current-carrying extensions -thereof.
,' ' kh/~
, ': '",': , ' , ., , . : . ,' ' ', . ,' , . " , . ., .- '. .
i9Z
GENERAL DESC~IPTION OF PLUG-IN FUSE
The smaller cross s~ctional area of the fuse link-forming portion of the plug-in fuse element is most advantageously achieved by reducing both the width and thickness thereof relative to that or the other current carrying portions of the plug-in fuse element. Reduction in thickness of the fuse link forming portion can be achieved in a number of ways, such as by milling and/or compressing the metal, the combination of the two methods being preferred. (The method by which the present plug-in fuse assembly is made constitutes a joint invention of only the applicants Williamson and Aryamane).
.. , ~
The just described plug-in fuse element can be used as a fuse by merely plugging it into pressure clip terminals or the like without any additional elements added theretc, or can be mounted within a housing in a ~i .
manner to be described, which is the preferred form of the invention. The plug-in fuse element just described with or without a housing can be readily mass produced by simpl stamping the same from the end of a strip of such fuse metal, ater selected areas thereof have been milled and/or ',' ' ~
., .
-- 6 -- . .
,t, i, , ,. ~ . ,,, . ' ~
compressed to reduce the cross sectional area of the portions of the strip which are to constitute the fuse link portion of the plug-in fuse elements to be severed therefrom. (Such a one piece plug-in use element as described is -to be con-trasted with a combination fuse and terminal member attached to an insulating base which has been manufactured and sold in Europe for many years, which member has an elongated and compressed C-shaped configuration. The end portions of the member are on the exterior of the base and are received bet-~een a pair of spaced support clips. Also, U. S. Patent No.
3,SQQ,463 to Gregoxy and U, S. Patent No. 2,463,351 to Vail sho~ one piece fuse and terminal elements of a different and more costly construction than that of the present invention ~uSt descr~bed. ~Iso, in tha ~use of the Vail patent, the one piece fuse and term~nal element forms a subcomponent of ~ ....
a! ~onventional ~cre~ soc~et type fuse and thus is not a plug-in uni~t ~nsertable dxrectly into a mounting panelO
In accordance ~ith the most preferred form of the - ~ plug-i~ fuse element of t~e invention, the terminal~forming
` ¦~ The present invention relates to miniature current ¦ overload fuses which, whether they are rated to carry only a few . ~ amperes or as much as 30 amperes, occupy a space which i5 only a : ~: fraction of the space occupied by the conventional glass envelope ; ~ ~yli~d i~:~l fu rs.
f , ~ . .
- ~
.
' ' .
. .
~05059Z -z ¦ An overload fuse capable of carrying currents of the above range of magnitudes commonly comprise a sealed cylindrical glass envelope with cylindrical terminals projecting from the ends t'hereof and a fuse link extending between the fuse terminals within the sealed cylindrical envelope. Fuses of this type having current ratings of 10-30 amperes commonly have lengths of the , ' order of magnitude of over one inch and, together with t'he mounting terminals wit'h whic'h they are associated, an overall ¦width of approximately one quarter inch and higher. Some of the disadvantages of this' type of fuse are the large space requirements for mounting the same and difficulty in removing ~hem~from mounting clip5. ' '"
I ~ ~ A marked~improvement in overload current fuses of ~ It'he rating referred to have been made in t'hat the fuse has a . ~ .
length well under 3/4 inc'h and a width of under 1/4 inch. Such a fuse is disclosed in U.S. Pat~nt No. 3,436,711. Also, t'he terminals of the improved fuses plug into socket openings transvsrsely to the length of ths fuss body, so ths socket connector can be a much less expensive and less bulky support mesns tb t thsn needed for conventional high curr~nt rot~d fuses.
' - 2 _ ' - ..' ,, l ...
......
- : . . ' ' ' . :
'--~
s~
While the miniature fuses heretofore developed have been a substantial improvement over the conventional cylindrical glass envelope fuses, they still left much to be desired from the standpoint of their cost of manu-facture and protection to the user. For example, in some of the miniature fuses heretofore developed, the fuse link was exposed so that the insertion thereof into a shorted circui-t would blow the same and spew fuse mater-~al onto the person Inserting the use. Also, it was possible for a person inserting or removing such a fuse to ~ake contact wIth the exposed fuse link which created a shock hazarcl if he engaged the fuse negligently.
While in one form of miniature fuse heretofore develop-ed, the ~use link was enclosed in a transparent housing having a handle extending from the outer walls thereof, the'fuse was relatively expensive to manufacture, it had less reliability than the fuse of the present inven- .
tion ! ,a,nd the ~use link was only visible on the side of . :
the housin~ because the handle obstructed a frontal view , thereof, so the ~use link could not ~e seen when the fuse was mounted between another pair of similar closely ~spaced ~uses on a'mounting panel. Also, the handle could not'be easily grasped due to the small clearance between a,djacent fuses.
' ' .
.
, ' cb/ ~ 3 , , .
It is, accordingly, one of the objects of the invention to provide a miniature fuse ~ith or without an enclosed fuse link and which is capable of carrying currents where desired well in excess of 10 amperes, suc~ as up to 30 amperes, and can be manufactured at a much smaller cost than the miniature fuses heretofore designed.
A related object of the invention is to pro-vide a miniature fuse having a housing providing an insulated gripping surface and a shield protecting the user from being contacted by t~e fuse material as an .....
inserted ~use ts blown~ and which further can be easily ~serted ;~nto or remoyed from an appropriate female connector on a mount 7 ng panel where the connectors are yery closel~ spaced, and also preferably wherein the ~use ~ink thereof ~s re~dil~ v~s~ble when the fuse i9 ~ounted ~ suc~ ~ ~ount~n~ panel.
In the mlniature fuses heretofore developed, :
the design of t~e fuses were such that the.external con- .:
~isur~tion and d~mensi.o~s of the fuses were identical for idely yary~ng current ratings thereof~ It was, therefore, xeadily possible for a fuse having a very ~igh current rating, suc~ as 2n-30 amperes, to ~e inadvertently placed into a connector associated with a circuit where the :-current rating may be ~rom 5-15 amperes, creating a very . .-hazardous o~erating condition. While these fuses were generally marked or color coded to indicate their fuse ratinys, the user could readily make a mistake by mis-reading the usually small current rating markings or com~
plicated color codes.
~ :
, . . . .
cb/ _ ~
.: -. ,,'',,'', ~' . . ' '. ' ,, ~,............... ....
, ,. .. , ' ' ';.. ",.. '" '.'; , '' : ' . ' ' ' ! ' . ~ , ~ . ~ . .
~L~5~%
Accordingly, another objec-t of the invention is to provide a fuse design where, although the different fuse assemblies have substantially identical configurations and size, the difference between relatively high and relatively low current rated fuses can be readily detected.
In most of the miniature fuse designs heretofore proposed, the terminals have cylindrical pin-like configura-tions moldedinto bases of insulating material, and the fuse ; links were soldered between the inner ends of these terminals.
` 10 The presence of solder connections sometimes crea-ted problems of reliability resulting from corrosion or hot spots due to poor solder connections or deterioration with age. Thus, another object of the present invention is to provide a miniature fuse having features satisfying one or more of the objectives previously discussed and, in addition, are -devoid of the corrosion or hot spot problems referred to.
SUMMARY OF THE FUSE LINK INVENTION
One aspect of the present invention may be broadly descrlbed as a plug-in fuse element comprising a one-piece plate-like body of fuse metal which body comprises a pair of juxtaposed, laterally spaced, generally parallel and coplanar terminal-forming blade portions to be received by pressure clip terminals in a mounting panel, the terminal-~-i, forming blade portions having current-carrying extensions at the inner end portions thereof which are interconnected by a fuse-forming lin~ portion of much smaller cross-sectional area than said terminal-forming blade portions and the current-carrying extensions -thereof.
,' ' kh/~
, ': '",': , ' , ., , . : . ,' ' ', . ,' , . " , . ., .- '. .
i9Z
GENERAL DESC~IPTION OF PLUG-IN FUSE
The smaller cross s~ctional area of the fuse link-forming portion of the plug-in fuse element is most advantageously achieved by reducing both the width and thickness thereof relative to that or the other current carrying portions of the plug-in fuse element. Reduction in thickness of the fuse link forming portion can be achieved in a number of ways, such as by milling and/or compressing the metal, the combination of the two methods being preferred. (The method by which the present plug-in fuse assembly is made constitutes a joint invention of only the applicants Williamson and Aryamane).
.. , ~
The just described plug-in fuse element can be used as a fuse by merely plugging it into pressure clip terminals or the like without any additional elements added theretc, or can be mounted within a housing in a ~i .
manner to be described, which is the preferred form of the invention. The plug-in fuse element just described with or without a housing can be readily mass produced by simpl stamping the same from the end of a strip of such fuse metal, ater selected areas thereof have been milled and/or ',' ' ~
., .
-- 6 -- . .
,t, i, , ,. ~ . ,,, . ' ~
compressed to reduce the cross sectional area of the portions of the strip which are to constitute the fuse link portion of the plug-in fuse elements to be severed therefrom. (Such a one piece plug-in use element as described is -to be con-trasted with a combination fuse and terminal member attached to an insulating base which has been manufactured and sold in Europe for many years, which member has an elongated and compressed C-shaped configuration. The end portions of the member are on the exterior of the base and are received bet-~een a pair of spaced support clips. Also, U. S. Patent No.
3,SQQ,463 to Gregoxy and U, S. Patent No. 2,463,351 to Vail sho~ one piece fuse and terminal elements of a different and more costly construction than that of the present invention ~uSt descr~bed. ~Iso, in tha ~use of the Vail patent, the one piece fuse and term~nal element forms a subcomponent of ~ ....
a! ~onventional ~cre~ soc~et type fuse and thus is not a plug-in uni~t ~nsertable dxrectly into a mounting panelO
In accordance ~ith the most preferred form of the - ~ plug-i~ fuse element of t~e invention, the terminal~forming
2~ blade portions of the pIug-in ~use element are-provided with transversely projecting ~ing5 when the fuse has a relatively i .
high current rating, ~iVing the terminals the appearance of relatiyely massive ~nd, therefore, hlgh current carr~ing capaC~ty terminals~ and preVenting thelr insertlon into low current fuse-receiv~ng sockets.
In accordance wlth another feature of the invention, the above one piece plug-in fuse element or one similar to the same, forms an assem~,bly with a housing made of insulating mater-.
ial which provides insulated gripping surfaces for the assembly and forms a shield which prevents the spewing of fuse metal intothe surrounding atmosphere when the fuse is blown. In the . ... .
' ;~ . ' ~
cb/ 7 ., - - . , ~, :
', ~ . . ' . . " ~ . , ,' . ' . .:
~D5~2 most preferred form of the invention, although the housing can be comprised of two confronting housing halves snapped around the plug-in fuse element, the housing is most advan-tageously a one piece molded elemen-t having an opening in the inwardly facing side thereof into which the plug-in fuse element is inserted into the housing. Also, the hous-ing is most advantageously a narrow elongated shape de~ined by relatively closely~spaced side walls hridged by narrow end -~ walls and a narrow outer wall. The plug-in fuse element may ; 10 be anchored in place in the housing by forming projecting proportions in the housing which extend into apextures in the plu~-in fùse element, the projections being most advan-tageously formed by a cold staking or ultrasonic material sotening-~,operation. At least the aforementioned outex wall of the housing (i.e. the wall which faces outwardly when the ~-~ fuse assembly is mounted on a mounting panel)~ and preferably the entire housing, is most advantageously made of a trans-parent material. The fuse link port:ion of the plug-in fuse element is positioned at a point contiguous to this trans-parent outer wall where it can be readily seen at all times.
At least the longitudinal end portions of the outer wall pre~exably over~ang the rest of the housing to pro~ide con-yenient gripp~ng surfaces at the ends of the housing, so that the plu~-in fuse assembly can be readily grasped for insextion into and removal from any point in a mounting panel, despite small clearance5 between adjacently mounted plug-in ~use asse~blies.
In accordance with still another aspect of the invention the housing is preferably provided with a pair o~ terminal access openings in the owter wall thereof, ch/ - 8 -which openings prefe~ably taper inwardly to a point in alignment with the innermost ends of the terminal extensions, so resistancemeasuring test probes are guided into contact with the terminal-forming blade portions of the plug-in fuse element to test for continuity on the assumption that the fuse link might have a crack in it which is not readily ~isible through the above described transparent ~ous;ng outer wall. The defining walls of the access . openings preferably ~ave skirt portions extending there-~rom ~hic~ act as shield walls to prevent blown fuse material from reach~ng t~e terminal access openings.
~ With a plug~in fuse assembly cQnsisting of a :~ single stamping forming both the terminal-forming blade portions and the fuse-forming link portions of a plug-in fuse element, and a housing into which such single piece stamping may be readily inserted and locked into place, .~ - the design of the fuse assembly lends itself to a low cost mass production aSsembly thereof wherein various stamping and milling operations forming attached blanks ~or making many plug-in fu~e elements are ~irst performed . on lon~itudInally~ spaced areas of a ~use metal strip.
Then, a plug-in fuse a~sembly is completed by applying a housing over the end o~ the strip, securlng each hous- .
i.n~ in place and severin~ a completed plug-in fuse ;. ::
asse~bly ~rom the str~p, the housing applying and sever-ance operations on the strip being repeated in sèquence :27 to mass produce the plug-in fuse assemblies.
. `
b 9 c / _ _ , SUM~R~_OF THE METHOD
In accordance with its broadest aspect the method may be described as a method of making a plug-in fuse element comprising a pair of juxtaposed laterally spaced generally parallel terminals to be received by pressure clip terminals or the like, the terminals having current-carrying extensions at the inner end ., -~ port,i,ons thereof which are to be interconnected by a ;" fuse lInk, the method comprising: providing a blank ` 10 compr~sing a sheet~like body of fuse metal, and .' ~lan~ing the sheet-like body of ~use metal to form i.' a pa~r o~ term~nals and a fuse-forming link portion ... .
~nte~connecting t~e terminals, the fuse-forming link ~ , ~ortt,on bq~ng substant~ally smaller in cross-sectional - ~rea, than t~e ot~er portions of t~le blanked body of ~; ~use met~l.
.. . GENER:~L DESCRIPTION OF T E METHOD
,1 The terminal forming blade portions and current ':
:
,~, carrying extensions preferably extend longitudinally . 2~ ' o the strip. While the fuse-forming link portion could .
be formed in a direction extending longitudinally of the '. terminal for~ing blade portions and the strip, it is most i . pre~erably formed ln the direction extending between ' '' ., ' ' . ~ ~'''~' :: :
cb/ - 10 -;, . . : . ': , . :
.: ,; :-' :~ , , . , , :
5~
the current carrying longitudinal extensions of the terminal ~orming blade portions, that is, in a direction extendlng transversely or laterally there-between. The blanking operation described also forms .~
a relatively, strong, rigid web paralleling the portion of the body of fuse metal which forms the fuse-forming link portion thereof. A rigid body of insulating material is then anchored between the portions of the body of fuse metal between which the fragile fuse forming link portion extends, to act as an insulating rigid supporting interconnection between the portions of the blank connected by the fragile fuse forming link portion thereof. In the most preferred form of the invention, this body of insulating material is extended over and around the fuse-formin~ link portion ' of the blank, so it fully encloses the same except for portions through which the terminal forming blade portions -~ project. The transverse web adds rigidity to the blank and securely maintains the relative positions of the terminal ,:
' ' . , .
.: . .
.
,~
, ... . ..
l~r~ k~
forming blade portions and the current carrying extensions thereof before the body of insulating material is anchored thereto. Thus, distortion, breaka~e or other damage of the blank is effecti~ely prevented during these operations.
The transverse web is most advantageously left exposed after application of the body of insulating material, so that t~e trans~erse web may then be most conveniently severed from the blank to eliminate a short circuit between the ~use formlng link portion of the blank~ -The blanking of the exposed transverse web ; ~nterconnecting the terminal blade portions may be such as to proyide t~e pair of exposed laterally spaced coplanar ter~inal portions with selected widths corresponding to -the ampere xa-tlng o~ the plug~in f~se asse~bly. Also, ,;., .
, the outer end portions of the exposed pair of terminal forming blade port-`ons may be coined to form tapers thereon ... , . .
to ~acilitate insertion thereof into the clip terminals i~ ~ount~ng panel.
. : - . ' , :
.`.! ~ ~ The blank of fuse metal is preferably initialIy proyided with a central portion of reduced thickness so th~t, w~en the ~lank ~s blanked, the lnterconnecting fuse-~orming link portion of the blank is of less thickness -.: . t~an t~e spaced copl~nar terminal forming blade portions and t~e current carryins extensions. By controlling the .j ~ . .
thickness of the fuse-~orming link portion and the width -, thereof desired selected ampere ratings ~or the fuse asse~bly may be obtained. The central portion of reduced thickness of the blank of ~use metal may be reduced by 2 illing or b~ milling and subsequent squeezing.
, .
, ~ cb/ ~ 12 -~. : , , . ~; ,. . . .
.
.
, . . . .
. Il 105059~ ~
While the method aspects of ~hP invention are most advantageiously carried out using a strip o~ fuse metal where the previously desired coplanar plug-in fuse elements can most ¦easily be blanked and severed from the end of the advancing strip 1f fuse metal, the broader aspects of the invention do not so Ire~uire.
: ~urther objects o~ this invention reside in the particular method steps and in the cooperatlve relationship between the method steps in making the aforementioned plug-in fuse assembly.
DESCRIPTION QF THE DRAWINGS
Fig. 1 is a perspe~tive view of a preferred form of the : plug-in fuse assembly of the invention;
: Fig. 2 is an exploded view of the housing and plug-in ~use element making up the plug-in fuse assembly of Fig. l;
Fig. 3 is a top plan view of the plug-in ~use assembly of ~ig. l; .
~ ig. 4 is a vertical longitudinal sectional view through .
the fuse assembly shown in Fig. 3, taken along section line 4-4 : ~therein; .
Fig. 5 is an enlarged bottom view of the plug-in use 'assembly of Fig. 1; .
" ', ' , ' ' :
'' .
I, .
, ' ' ' , ' ' '' ' , ' ' ' ~ . ~ :''' i9Z
Fig. 6 is an enlar~ed transverse ver-tical sectional view through the fuse assembly shown in Fig. 4, taken along section line 6-6 thereof;
Fig. 7 ls an enlarged ~ertical transverse sectional view through the cen-ter portion of the fuse assembly shown in Fig. 4, taken alony section line 7-7 thereof;
Fig. 8 is a greatly enlarged fragmentary sectional view through the fuse link portion of the plug-in fuse ~ . .
asser~ly shown in Fig. 2, taken along section line 8-8 thereoft and showing the manner in which the fuse-forming link portion thereof is reduced in thickness by a combina-tion millirl~ and pressing operation;
; Fig. 9 illustrates the insertion of the housing of the fuse assembly of Figs. 1-8 onto the end o a pre- ~
`; milled and pre-stamped strip of fuse metal from which -. ;. ..
- numbers of plug-in fuse elements like that shown in these ~, figures are formed;
Fig. 10 shows the separation of a completed plug-2Q in fuse assembly from the strip shown in Fig. 9, after a strip staking and seYering operation has been carried out;
' Fig4 11 illustrates a fragmentary longitudinal ;; sectional view through a portion of a plug-in fuse assembly like that shown in Figs. 1-10 but which has been modified by addin~ a magnif~ing lens to the outer wall of the housing -thexeo~;
! Fig. 12 illustrates a fragmentary side elevational view of a plug-in fuse ass~.mbly modified from that shown in , E'iys. 1-11 in that the wings on the terminal-forming blade 3Q portions o~ the plug-in fuse element have been removed to indicate a lowqr current rated fuse.
Fig. 13 illustrates the milling of the strip cb/ - 14 -., , . ~ . . .. . . . . .. .
before it is blanked or stamped as illustrated in Figs. 9 and 10;
Fig. 14 illustrates the milled strip of Fig. 13 after it is squeezed or compressed and before it is blanked or stamped as illustrated in Figs. 9 and 10;
Fig. 15 illustrates the milled and squeezed strip of Fig. 14 after it has been partially blanked or stamped and before it ls completely blanked or stamped as illustrated ~n F~s. 9 and 10 in the event that it should be desirable to utilize two progressive stages of blanking or sta~pIng instead of a single stage.
~-' DESCRIPTION OF THE PREF~.RRED EMBODIMENT
-I OF THE_INVENTION
Referring now more particularly to Figs. 1-4, there is shown a plug-in fuse assembly 2 made of only two component parts, namely a plug-in fuse element 4 which most advantageously is a single stamping from a strip of fuse ` ~ metal, and a housing 6 which most advantageously is a single piece synthetic plastic molded part defining a space therein 20 into whic~ portions of the plug-in fuse element 4 extend ~-~nd are secured ~n any suitable way, but most preferably ~y a cold stak~ng operation to be described.
.. . .
The plug-in fuse element 4 has terminal-forming blade portiDns 8-8 extending in spaced parallel relationship from the inner or bottom margin of the housi~g 6 in what wiIl be referred to as a downward or inwardly extending ~ ;
direction, The ends of the termtnal-forming blade portions 8~8 o~ the plu~-in ~use element are most advantageously tapered at 9-9 to ~orm pointed end portions which readily slip into place between the confro~ting walls of conventional spri:n~ clip terminals ~not shown) supported in mounting panel apertures. The terminal-forming blade~portions 8-8 ,; . . .
cb/ - lS -, - . ~, . ..
. . . . .
.
of the plug-in fuse element 4 have inwardly extending rough - curren-t rating indicating wings or projections 10-10, to provide a more massive appearance to the exposed terminal-fo~ning portions 8-8 of the plug-in fuse element 4, identify-ing the fact that the fuse assembly is one having a rela-tively high current rating, such as in the range of from 20 to 30 amps. ~The exact current rating is indicated by indlcia 13 on the outer walls of the housing as shown in Fi~s. 1-3O Where a plug-in fuse element has a relatively low current rating such as 5 to 15 amperes, the wings 10-10 ` are eliminated so the user knows i~inediately that the plug-in fuse elemen-t whic~ does not ~ave any wings is for a lower current rated application. Su~h a plug-in fuse element is shown in Fig. 12~.
~I The plug-in fuse element 4 is stamped from a strip 4' of fuse metal ~Figs. 9 and 10 and 13 to 15). Prior , . .
to the plug-in fuse element being severed from the strip 4' , the wings 10-10 are interconnected to form a transverse ~ .
rigidifying web 10' for the strip 4', and so a narrow piece o~ material is stamped from the transverse web 10' i~ to form the terminal-forming blade portions 8-8 and a gap ~ 12 between the ~ame. The tapered portions 9-9 of the - terminal-~orming blade portions 8-8 may be formed by coin-ing dies ~not shownl during the operation which severs the ~plug-in fuse element from the strip or preferably thereafter.
The terminal-forming blade portions 8-8 have current carrying extensions 14-14 projecting into the afore-mentioned space formed by the housing 6j which current-carrying extensions project well up into the upper or outer extremities of the housing 6, to be contiyuous to the front or outer wall of the housing to be described. The outer end portions of the current-carrying extensions 14-14 are inter-'~
cb/ - 16 -.
.
.
.
connected by a fuse-forming link portion 20 whicn is prefer-ably both narrower in width and much smaller in thickness than the other current-carrying portions of the plug-in fuse element 4. The current-carrying capacity of the ~use-forming link portion 20 may be varied by varying the fuse : metal composition or by varying the width and/or the thick-ness of the fuse-forming link portion. In the particular configuration o~ the plug-in fuse element 4 shown in the drawings the current carrying extensions 14-14 join the fuse-~orming link portion 20 of the plug-in fuse element 4 by tapered portions 22-22. All of the various parts o-f the plug-in ~use element are substantially in coplanar relat1on so no metal bending operations need be per~ormed in the process of ~Zak-~ng the same.
It was found that a reduction o~ the thickness of the metal of the fuse-forming l:ink portion 20 is prefer-ably achieved by a milling operation which mills away the metal on one side thereof to form Zl generally curved depression 24 best shown in Fig. 8 The outer portions of thls depression 24 are identi~ied by reference numerals 24a~24a ~nd may represent t~e milled surfaces. The flattened ... .
inter~ediate portion 24b of the depression 24 may be obtained j, .
by squeeziny or pressing the metal to further reduce this th~ckness thereo~. On the other hand, following an initial miIling step, both the curved outer portions 24a-24a and the ~lattened intermediate portion 24b of the depression 24 may be obtained by s~ueezing or pressing. For example, it was ound that in one plug-in ~use element, the thick- ;
ness o~ the ~use metal was reduced from an initial thick-ness o~ 0.027 inches to about .005 inches by a milling oper-ation, and a further reduction o~ .002 inches was achieved by a pressing operation, ending up wlth a minimum thickness . ' .
cb/ - 17 -, . , , ,, : ~ . . : :
., :: . ~: ,, . , , , ,: :
..
,., , ~. , ; , ; , ,,. . :, ,.,: .
~- `
OL the fuse-formlng link portion 20 of .003 inches. of course, the precise thickness of the fuse me-tal depends upon the fuse metal composition, the width of the fuse-forming link portion 20 and the desired current rating of the fuse.
While the plug-in fuse element 4 may. be used as a fuse element without lts incorporation in the housing 6, for safety reasons it is preferred to incorporate the plug-in fuse element 4 in the housing 6. To this end, and for reasons to be explained, the outer end portions of the .. .
.~ 10 terminal extensions 14-14 are provided with outwardly .~. or upwardly projecting tabs 18-18 adapted to make contact with test probes to test for the continuity of the fuse-.: forming l,nk portion 20 of the plug-in fuse element 4.
. ;.
~ Also, to anchor the plug-in fuse element 4 within the . housing 6, anchoring apertures 26-26 and 28-28 are res-;.~ pectiyely ~ormed in the terminal exten~ions 14-14 to receive anc~oring projections to be descri.bed formed in.the housing walls, ~; - .
While the housing 6 could be made in two separate parts snappable together, the housing is most advantageously - ~'1 . .
a single piece molded part as previously indicated. Also, it preferably has a narrow elongated configuration formed by relat~vely closely spaced side walls generally indicated ~ .
: : by reference numeral 30-32, the side walls having end portions : .
:, .
30a-32a and 30a-32a which are spaced together much more :~
closely than the central or intermediate portions 30b-32b .:: :.: ,:
s thereof. The side walls 30-32 are interconnected at their end margins by narrow end walls 34-34, and at their outer or top margins by an outer wall 38 which overhangs the rest o the h~using to form downwardly facing shoulders 40-40 at the longitudinal ends of the outer wall 38 and downwardly facing shoulders 40'-40' along the longitudinal side margins cb/. - 18 -' . . -,: : , :, ; .
5~
of the housing 6. The shoulders 40'-40' are coplanar continuations of the shoulders 40 40 at the ends of the housing 6.
Terminal access openings 42-42 are provided in the outer wall 38 adjacent the opposite end portions thereof in alignment with the location of the test probe-receiving tabs 18-18 of the plug-in fuse elemen-t 4. The walls of the terminal access openings 42-42 taper down to an inner dimension which approximates the width of the test probe- :
receiving tabs 18-18 so that test probes can be guided into contact with the tabs 18-18. The terminal access openings 42-42 communicate with the aforementioned plug-in fuse element receiving space in the housing 4. The portions 44-44 of this space immediately beneath the access openings 42-42 are relatively small because of the close spacing of the side ~all portions 30a-32a of the housing at these points, the width of the spa~e portions 44-44 as viewed in Fig. 6 tapering from the bottom open end of the housing upwardly .
:, toward the terminal access openings 42-42, reaching a narrow . 20 dimension about e~ual to .the thickness of the plug-in fuse elément 4. At the inner margins of the terminal access open-~, .
ings 42-42 the uppar wall 38 is provided with downwardly .~
extending skirts 46-46 which act as shield walls preventing ~:
. spewiny ~use metal from gaining entrance to the terminal :; access openings 42-42. These shield forming skirts 46-46 - also act as stop or abutment shoulders for the current-.....
carrying extensions 14-14 of the terminal-forming blade portions 8-8 of the plug-in fuse element.
The fuse~forming link portion 20 of the ~use element 4 is positioned in a relatively wide portion 44' (Fig. 7) of the housing interior, to provide for free : .circulation of air around the cen-ter portion of the fuse-'':
c~/ -- 19 --~5~
: forming link portion, which is the part thereo~ which first melts under excessive current flow~ so heat does not accumu~
late which would adversely affect the current at which the fuse will blow.
; The narrow and wide portions 44-44 and 44' of the space within the houslng 6 open onto the bottom of the ~;: housing for the full extent thereof through an entry open-:~ ing 48. The opening 48 permits the housing to be pushed . over the end portion or end blank of the pre-stamped and : 10 milled strip 4' from which a completed fuse element is punched immediately following the securing of the housing 6 to the end portion or end blank of the strip as previously - ind~cated.
The housing 6 is preferably a molded part made of : ~ a tran~parent synthetic plastic material so that the fuse-forming filament portion 20 of the plug-in fuse element 4 ~ I
is readily visible throuyh the intermediate portion of the ,~ outer wall 38, to which the fuse-forming link portion 20 ~ is in spaced but relatively contiguous relation. The housing ;1 2Q is prefera~ly molded of a high temperature transparent nylon ~ made by Belding Chemical Industries of New York City, New ~;
-;: York ~Product Code No. LX~3330).
. While the housing interior 6 could be made with resilient projections which snap into the anchoring apertures 26-26 and 28-28 in the plugin fuse element 4, it is preferred J to secure the housing in place by forming projections 52 and 54, hy a cold staking operation, ultrasonic melting or other opération, which enter the anchoring aper-tures 26-26 ; and 28-28 of the plug-in fuse element 4, The depressions 56 and 58 left by a s-taking operation are shown in the side wall 30 in Figs. 1 and 6.
To improve the visibility of the fuse-forming , c~i - 20 -.
~L05~ 2 link portion 20 of the plug-in fuse element, the outer wall o~ the housing of the fuse assembly can be modified as shown in Fig. 11 where the housing outer wall 38' of a modified fuse assembly 2' is thickened and curved to form a magnifying lens. Also, as shown in Fig. 12, the fuse as~embly 2' is a ~ low current rated fuse assembly as evidenced by the absence ,~ of wings on the terminal-forming blade portion 8'-8' on - the plug-in fuse element 4'.
, The exemplary embodiments of the invention just ,, 10 described have thus provided an exceedingly reliable, - compact and inexpensive to manufacture plug-in fuse assembly ,' which can be readily inserted into and removed from suitable closely spaced spring clip terminal connectors in a mounting panel ~y grasping the shoulders 40-40 at the longitudinal , , . .
ends of the hous~ng 6. The transparent material out of which the housing 6 is made forms a convenient window in the outer .. .. . . .
! wall through ~hich the ~use-forming link portion of the plug- -in fuse element can be vlewed when the plug-in fuse assembly i is m~unted on the mounting panel. rrhe terminal access open-,, 20 ings enable test equipment to test the continuity of the , fuse if the user does not desire to rely sole y on a visual observation of the fuse-forming link portion of the ~use.
, The presence or absence of wings on the terminal-forming " blade portion of the'plug-in f'use element immediately informs '~
the user whether he has selected a relatively high or low ~ ~ ' current rated fuse, although the indicia 13 should be ~ ' ~.
examined to determine the actual current rating. ~-The preferred method of making the plug-in fuse ,~
as~embly is illustrated in E'igs.13, 14, 15, 9 and 10. It ' includes providlng a continuous strip 4' of a f'use metal which is sequentially advanced the distance of a blank 4" between ' ' distances 4"' as indicated in dotted lines in these figures. ~ ' ,; ~ , .
'.
~b/ - 21 -.. . ..
~5~ .
In Fig. 13 the strip 4' is provided at spaced intervals with a milled portion 60, the milled portion 60 being pro-vided in the appropriate place in each blank 4"~ There-after, at each milled portion 60 each blank is squeezed or compressed as indicated at 62 in Fig. 14 to provide by ; squeezing or pressing a depression in the blank having curved surfaces 24a 24a and a flattened intermediate portion 24b as referred to above in connection with Fig. 8.
After the appropriate depression is formed in each blank 4", the advancing strip 4' is then blanked to form the terminal portions 8, the current carrying ex-tensions 14 thereof and the further extensions 18 thereof. This may be accomplished in one blanking operation or in a plural-ity of blanking operations. As illustrated herein, the blanking operation is accomplished in two steps. The -first blanking step in the sequentially advancing strip 4' is illustrated in Fig. 15 wherein each blank 4ll is seguentially blanked as indicated at 64 to provide the extensions 18 and a portion of the fuse link 20 having the tapered portions 22. Thereafter, each blanX is sequ~ntially blanked as illustrated in Fig. 9 at 66 to provide the current carrying extensions 14 and the other part of the fuse link 20 extend-ing between the current carrying extensions 14 having the tapered portions 22. During this same blanking operation the interlocking holes 26 and 28 are also blanked. In this blanking operation the transverse web 10' still remains between the terminal forming blade portions 8 of each blank.
As shown in Fig. 9, the houslng 6 is inserted over the end blank 4" to receive the current carrying extensions 14 and the fuse link 20 within the housiny and with the terminal forming blade portions 8 still lnterconnected by the txansverse web 10' extending from the housing. The housing "
cb/ - 22 -is then cold s-taked and/or ultrasonically secured in -the interlock openings 26 and ~8 of the end blank 4" as indica-ted ~; - at 56, 58 in Figs. 6 and 10. Preferably, the placing of the housing 6 over the end blank 4" and securing the housing to the end blank occurs before severing the end blank from the strip at the blank edye 4'''. In Fig. 10 the end hlank 4" and its housing 6 are severed from the strip 4' at the blank edge 4 " ' of the end of the blank 4''' to form the substantially completed plug-in fuse assembly, but with the transverse web 10' still intact. Thereafter, the --transverse ~e~ 10' is blanked at 12 to provide the spaced apart terminal forming blade portions 8 as indicated at Fig. 10. Here, the blanking of the transverse web may provide wings 10 as illustrated in Fig. 10 or the wings may be eliminated ~s illustrated in Fig. 12. Thereafter, :.-the ends of the ter~inal forming blade portions 8 may be ~ coined as illustrated at 9 to form tapered ends for the ~-.
blade portions. In this ~ay, the c:omplete plug-in fuse ass~bly as illustrated in Figs. 10 and 1 may be provided.
- 20 While for purposes oE illustration herein one I preferred specific method of making the plug-in ~use assembly i .
has been disclosed herein, other methods may become appar-ent to those skilled in the art and therefore this invention is to be limited only by the scope of the appended claims.
:
, . . :: .
~, , ~ ..... ...
, . 1 , ~ , ,., ". .. ..
' .
cb/ - 23 -.,
high current rating, ~iVing the terminals the appearance of relatiyely massive ~nd, therefore, hlgh current carr~ing capaC~ty terminals~ and preVenting thelr insertlon into low current fuse-receiv~ng sockets.
In accordance wlth another feature of the invention, the above one piece plug-in fuse element or one similar to the same, forms an assem~,bly with a housing made of insulating mater-.
ial which provides insulated gripping surfaces for the assembly and forms a shield which prevents the spewing of fuse metal intothe surrounding atmosphere when the fuse is blown. In the . ... .
' ;~ . ' ~
cb/ 7 ., - - . , ~, :
', ~ . . ' . . " ~ . , ,' . ' . .:
~D5~2 most preferred form of the invention, although the housing can be comprised of two confronting housing halves snapped around the plug-in fuse element, the housing is most advan-tageously a one piece molded elemen-t having an opening in the inwardly facing side thereof into which the plug-in fuse element is inserted into the housing. Also, the hous-ing is most advantageously a narrow elongated shape de~ined by relatively closely~spaced side walls hridged by narrow end -~ walls and a narrow outer wall. The plug-in fuse element may ; 10 be anchored in place in the housing by forming projecting proportions in the housing which extend into apextures in the plu~-in fùse element, the projections being most advan-tageously formed by a cold staking or ultrasonic material sotening-~,operation. At least the aforementioned outex wall of the housing (i.e. the wall which faces outwardly when the ~-~ fuse assembly is mounted on a mounting panel)~ and preferably the entire housing, is most advantageously made of a trans-parent material. The fuse link port:ion of the plug-in fuse element is positioned at a point contiguous to this trans-parent outer wall where it can be readily seen at all times.
At least the longitudinal end portions of the outer wall pre~exably over~ang the rest of the housing to pro~ide con-yenient gripp~ng surfaces at the ends of the housing, so that the plu~-in fuse assembly can be readily grasped for insextion into and removal from any point in a mounting panel, despite small clearance5 between adjacently mounted plug-in ~use asse~blies.
In accordance with still another aspect of the invention the housing is preferably provided with a pair o~ terminal access openings in the owter wall thereof, ch/ - 8 -which openings prefe~ably taper inwardly to a point in alignment with the innermost ends of the terminal extensions, so resistancemeasuring test probes are guided into contact with the terminal-forming blade portions of the plug-in fuse element to test for continuity on the assumption that the fuse link might have a crack in it which is not readily ~isible through the above described transparent ~ous;ng outer wall. The defining walls of the access . openings preferably ~ave skirt portions extending there-~rom ~hic~ act as shield walls to prevent blown fuse material from reach~ng t~e terminal access openings.
~ With a plug~in fuse assembly cQnsisting of a :~ single stamping forming both the terminal-forming blade portions and the fuse-forming link portions of a plug-in fuse element, and a housing into which such single piece stamping may be readily inserted and locked into place, .~ - the design of the fuse assembly lends itself to a low cost mass production aSsembly thereof wherein various stamping and milling operations forming attached blanks ~or making many plug-in fu~e elements are ~irst performed . on lon~itudInally~ spaced areas of a ~use metal strip.
Then, a plug-in fuse a~sembly is completed by applying a housing over the end o~ the strip, securlng each hous- .
i.n~ in place and severin~ a completed plug-in fuse ;. ::
asse~bly ~rom the str~p, the housing applying and sever-ance operations on the strip being repeated in sèquence :27 to mass produce the plug-in fuse assemblies.
. `
b 9 c / _ _ , SUM~R~_OF THE METHOD
In accordance with its broadest aspect the method may be described as a method of making a plug-in fuse element comprising a pair of juxtaposed laterally spaced generally parallel terminals to be received by pressure clip terminals or the like, the terminals having current-carrying extensions at the inner end ., -~ port,i,ons thereof which are to be interconnected by a ;" fuse lInk, the method comprising: providing a blank ` 10 compr~sing a sheet~like body of fuse metal, and .' ~lan~ing the sheet-like body of ~use metal to form i.' a pa~r o~ term~nals and a fuse-forming link portion ... .
~nte~connecting t~e terminals, the fuse-forming link ~ , ~ortt,on bq~ng substant~ally smaller in cross-sectional - ~rea, than t~e ot~er portions of t~le blanked body of ~; ~use met~l.
.. . GENER:~L DESCRIPTION OF T E METHOD
,1 The terminal forming blade portions and current ':
:
,~, carrying extensions preferably extend longitudinally . 2~ ' o the strip. While the fuse-forming link portion could .
be formed in a direction extending longitudinally of the '. terminal for~ing blade portions and the strip, it is most i . pre~erably formed ln the direction extending between ' '' ., ' ' . ~ ~'''~' :: :
cb/ - 10 -;, . . : . ': , . :
.: ,; :-' :~ , , . , , :
5~
the current carrying longitudinal extensions of the terminal ~orming blade portions, that is, in a direction extendlng transversely or laterally there-between. The blanking operation described also forms .~
a relatively, strong, rigid web paralleling the portion of the body of fuse metal which forms the fuse-forming link portion thereof. A rigid body of insulating material is then anchored between the portions of the body of fuse metal between which the fragile fuse forming link portion extends, to act as an insulating rigid supporting interconnection between the portions of the blank connected by the fragile fuse forming link portion thereof. In the most preferred form of the invention, this body of insulating material is extended over and around the fuse-formin~ link portion ' of the blank, so it fully encloses the same except for portions through which the terminal forming blade portions -~ project. The transverse web adds rigidity to the blank and securely maintains the relative positions of the terminal ,:
' ' . , .
.: . .
.
,~
, ... . ..
l~r~ k~
forming blade portions and the current carrying extensions thereof before the body of insulating material is anchored thereto. Thus, distortion, breaka~e or other damage of the blank is effecti~ely prevented during these operations.
The transverse web is most advantageously left exposed after application of the body of insulating material, so that t~e trans~erse web may then be most conveniently severed from the blank to eliminate a short circuit between the ~use formlng link portion of the blank~ -The blanking of the exposed transverse web ; ~nterconnecting the terminal blade portions may be such as to proyide t~e pair of exposed laterally spaced coplanar ter~inal portions with selected widths corresponding to -the ampere xa-tlng o~ the plug~in f~se asse~bly. Also, ,;., .
, the outer end portions of the exposed pair of terminal forming blade port-`ons may be coined to form tapers thereon ... , . .
to ~acilitate insertion thereof into the clip terminals i~ ~ount~ng panel.
. : - . ' , :
.`.! ~ ~ The blank of fuse metal is preferably initialIy proyided with a central portion of reduced thickness so th~t, w~en the ~lank ~s blanked, the lnterconnecting fuse-~orming link portion of the blank is of less thickness -.: . t~an t~e spaced copl~nar terminal forming blade portions and t~e current carryins extensions. By controlling the .j ~ . .
thickness of the fuse-~orming link portion and the width -, thereof desired selected ampere ratings ~or the fuse asse~bly may be obtained. The central portion of reduced thickness of the blank of ~use metal may be reduced by 2 illing or b~ milling and subsequent squeezing.
, .
, ~ cb/ ~ 12 -~. : , , . ~; ,. . . .
.
.
, . . . .
. Il 105059~ ~
While the method aspects of ~hP invention are most advantageiously carried out using a strip o~ fuse metal where the previously desired coplanar plug-in fuse elements can most ¦easily be blanked and severed from the end of the advancing strip 1f fuse metal, the broader aspects of the invention do not so Ire~uire.
: ~urther objects o~ this invention reside in the particular method steps and in the cooperatlve relationship between the method steps in making the aforementioned plug-in fuse assembly.
DESCRIPTION QF THE DRAWINGS
Fig. 1 is a perspe~tive view of a preferred form of the : plug-in fuse assembly of the invention;
: Fig. 2 is an exploded view of the housing and plug-in ~use element making up the plug-in fuse assembly of Fig. l;
Fig. 3 is a top plan view of the plug-in ~use assembly of ~ig. l; .
~ ig. 4 is a vertical longitudinal sectional view through .
the fuse assembly shown in Fig. 3, taken along section line 4-4 : ~therein; .
Fig. 5 is an enlarged bottom view of the plug-in use 'assembly of Fig. 1; .
" ', ' , ' ' :
'' .
I, .
, ' ' ' , ' ' '' ' , ' ' ' ~ . ~ :''' i9Z
Fig. 6 is an enlar~ed transverse ver-tical sectional view through the fuse assembly shown in Fig. 4, taken along section line 6-6 thereof;
Fig. 7 ls an enlarged ~ertical transverse sectional view through the cen-ter portion of the fuse assembly shown in Fig. 4, taken alony section line 7-7 thereof;
Fig. 8 is a greatly enlarged fragmentary sectional view through the fuse link portion of the plug-in fuse ~ . .
asser~ly shown in Fig. 2, taken along section line 8-8 thereoft and showing the manner in which the fuse-forming link portion thereof is reduced in thickness by a combina-tion millirl~ and pressing operation;
; Fig. 9 illustrates the insertion of the housing of the fuse assembly of Figs. 1-8 onto the end o a pre- ~
`; milled and pre-stamped strip of fuse metal from which -. ;. ..
- numbers of plug-in fuse elements like that shown in these ~, figures are formed;
Fig. 10 shows the separation of a completed plug-2Q in fuse assembly from the strip shown in Fig. 9, after a strip staking and seYering operation has been carried out;
' Fig4 11 illustrates a fragmentary longitudinal ;; sectional view through a portion of a plug-in fuse assembly like that shown in Figs. 1-10 but which has been modified by addin~ a magnif~ing lens to the outer wall of the housing -thexeo~;
! Fig. 12 illustrates a fragmentary side elevational view of a plug-in fuse ass~.mbly modified from that shown in , E'iys. 1-11 in that the wings on the terminal-forming blade 3Q portions o~ the plug-in fuse element have been removed to indicate a lowqr current rated fuse.
Fig. 13 illustrates the milling of the strip cb/ - 14 -., , . ~ . . .. . . . . .. .
before it is blanked or stamped as illustrated in Figs. 9 and 10;
Fig. 14 illustrates the milled strip of Fig. 13 after it is squeezed or compressed and before it is blanked or stamped as illustrated in Figs. 9 and 10;
Fig. 15 illustrates the milled and squeezed strip of Fig. 14 after it has been partially blanked or stamped and before it ls completely blanked or stamped as illustrated ~n F~s. 9 and 10 in the event that it should be desirable to utilize two progressive stages of blanking or sta~pIng instead of a single stage.
~-' DESCRIPTION OF THE PREF~.RRED EMBODIMENT
-I OF THE_INVENTION
Referring now more particularly to Figs. 1-4, there is shown a plug-in fuse assembly 2 made of only two component parts, namely a plug-in fuse element 4 which most advantageously is a single stamping from a strip of fuse ` ~ metal, and a housing 6 which most advantageously is a single piece synthetic plastic molded part defining a space therein 20 into whic~ portions of the plug-in fuse element 4 extend ~-~nd are secured ~n any suitable way, but most preferably ~y a cold stak~ng operation to be described.
.. . .
The plug-in fuse element 4 has terminal-forming blade portiDns 8-8 extending in spaced parallel relationship from the inner or bottom margin of the housi~g 6 in what wiIl be referred to as a downward or inwardly extending ~ ;
direction, The ends of the termtnal-forming blade portions 8~8 o~ the plu~-in ~use element are most advantageously tapered at 9-9 to ~orm pointed end portions which readily slip into place between the confro~ting walls of conventional spri:n~ clip terminals ~not shown) supported in mounting panel apertures. The terminal-forming blade~portions 8-8 ,; . . .
cb/ - lS -, - . ~, . ..
. . . . .
.
of the plug-in fuse element 4 have inwardly extending rough - curren-t rating indicating wings or projections 10-10, to provide a more massive appearance to the exposed terminal-fo~ning portions 8-8 of the plug-in fuse element 4, identify-ing the fact that the fuse assembly is one having a rela-tively high current rating, such as in the range of from 20 to 30 amps. ~The exact current rating is indicated by indlcia 13 on the outer walls of the housing as shown in Fi~s. 1-3O Where a plug-in fuse element has a relatively low current rating such as 5 to 15 amperes, the wings 10-10 ` are eliminated so the user knows i~inediately that the plug-in fuse elemen-t whic~ does not ~ave any wings is for a lower current rated application. Su~h a plug-in fuse element is shown in Fig. 12~.
~I The plug-in fuse element 4 is stamped from a strip 4' of fuse metal ~Figs. 9 and 10 and 13 to 15). Prior , . .
to the plug-in fuse element being severed from the strip 4' , the wings 10-10 are interconnected to form a transverse ~ .
rigidifying web 10' for the strip 4', and so a narrow piece o~ material is stamped from the transverse web 10' i~ to form the terminal-forming blade portions 8-8 and a gap ~ 12 between the ~ame. The tapered portions 9-9 of the - terminal-~orming blade portions 8-8 may be formed by coin-ing dies ~not shownl during the operation which severs the ~plug-in fuse element from the strip or preferably thereafter.
The terminal-forming blade portions 8-8 have current carrying extensions 14-14 projecting into the afore-mentioned space formed by the housing 6j which current-carrying extensions project well up into the upper or outer extremities of the housing 6, to be contiyuous to the front or outer wall of the housing to be described. The outer end portions of the current-carrying extensions 14-14 are inter-'~
cb/ - 16 -.
.
.
.
connected by a fuse-forming link portion 20 whicn is prefer-ably both narrower in width and much smaller in thickness than the other current-carrying portions of the plug-in fuse element 4. The current-carrying capacity of the ~use-forming link portion 20 may be varied by varying the fuse : metal composition or by varying the width and/or the thick-ness of the fuse-forming link portion. In the particular configuration o~ the plug-in fuse element 4 shown in the drawings the current carrying extensions 14-14 join the fuse-~orming link portion 20 of the plug-in fuse element 4 by tapered portions 22-22. All of the various parts o-f the plug-in ~use element are substantially in coplanar relat1on so no metal bending operations need be per~ormed in the process of ~Zak-~ng the same.
It was found that a reduction o~ the thickness of the metal of the fuse-forming l:ink portion 20 is prefer-ably achieved by a milling operation which mills away the metal on one side thereof to form Zl generally curved depression 24 best shown in Fig. 8 The outer portions of thls depression 24 are identi~ied by reference numerals 24a~24a ~nd may represent t~e milled surfaces. The flattened ... .
inter~ediate portion 24b of the depression 24 may be obtained j, .
by squeeziny or pressing the metal to further reduce this th~ckness thereo~. On the other hand, following an initial miIling step, both the curved outer portions 24a-24a and the ~lattened intermediate portion 24b of the depression 24 may be obtained by s~ueezing or pressing. For example, it was ound that in one plug-in ~use element, the thick- ;
ness o~ the ~use metal was reduced from an initial thick-ness o~ 0.027 inches to about .005 inches by a milling oper-ation, and a further reduction o~ .002 inches was achieved by a pressing operation, ending up wlth a minimum thickness . ' .
cb/ - 17 -, . , , ,, : ~ . . : :
., :: . ~: ,, . , , , ,: :
..
,., , ~. , ; , ; , ,,. . :, ,.,: .
~- `
OL the fuse-formlng link portion 20 of .003 inches. of course, the precise thickness of the fuse me-tal depends upon the fuse metal composition, the width of the fuse-forming link portion 20 and the desired current rating of the fuse.
While the plug-in fuse element 4 may. be used as a fuse element without lts incorporation in the housing 6, for safety reasons it is preferred to incorporate the plug-in fuse element 4 in the housing 6. To this end, and for reasons to be explained, the outer end portions of the .. .
.~ 10 terminal extensions 14-14 are provided with outwardly .~. or upwardly projecting tabs 18-18 adapted to make contact with test probes to test for the continuity of the fuse-.: forming l,nk portion 20 of the plug-in fuse element 4.
. ;.
~ Also, to anchor the plug-in fuse element 4 within the . housing 6, anchoring apertures 26-26 and 28-28 are res-;.~ pectiyely ~ormed in the terminal exten~ions 14-14 to receive anc~oring projections to be descri.bed formed in.the housing walls, ~; - .
While the housing 6 could be made in two separate parts snappable together, the housing is most advantageously - ~'1 . .
a single piece molded part as previously indicated. Also, it preferably has a narrow elongated configuration formed by relat~vely closely spaced side walls generally indicated ~ .
: : by reference numeral 30-32, the side walls having end portions : .
:, .
30a-32a and 30a-32a which are spaced together much more :~
closely than the central or intermediate portions 30b-32b .:: :.: ,:
s thereof. The side walls 30-32 are interconnected at their end margins by narrow end walls 34-34, and at their outer or top margins by an outer wall 38 which overhangs the rest o the h~using to form downwardly facing shoulders 40-40 at the longitudinal ends of the outer wall 38 and downwardly facing shoulders 40'-40' along the longitudinal side margins cb/. - 18 -' . . -,: : , :, ; .
5~
of the housing 6. The shoulders 40'-40' are coplanar continuations of the shoulders 40 40 at the ends of the housing 6.
Terminal access openings 42-42 are provided in the outer wall 38 adjacent the opposite end portions thereof in alignment with the location of the test probe-receiving tabs 18-18 of the plug-in fuse elemen-t 4. The walls of the terminal access openings 42-42 taper down to an inner dimension which approximates the width of the test probe- :
receiving tabs 18-18 so that test probes can be guided into contact with the tabs 18-18. The terminal access openings 42-42 communicate with the aforementioned plug-in fuse element receiving space in the housing 4. The portions 44-44 of this space immediately beneath the access openings 42-42 are relatively small because of the close spacing of the side ~all portions 30a-32a of the housing at these points, the width of the spa~e portions 44-44 as viewed in Fig. 6 tapering from the bottom open end of the housing upwardly .
:, toward the terminal access openings 42-42, reaching a narrow . 20 dimension about e~ual to .the thickness of the plug-in fuse elément 4. At the inner margins of the terminal access open-~, .
ings 42-42 the uppar wall 38 is provided with downwardly .~
extending skirts 46-46 which act as shield walls preventing ~:
. spewiny ~use metal from gaining entrance to the terminal :; access openings 42-42. These shield forming skirts 46-46 - also act as stop or abutment shoulders for the current-.....
carrying extensions 14-14 of the terminal-forming blade portions 8-8 of the plug-in fuse element.
The fuse~forming link portion 20 of the ~use element 4 is positioned in a relatively wide portion 44' (Fig. 7) of the housing interior, to provide for free : .circulation of air around the cen-ter portion of the fuse-'':
c~/ -- 19 --~5~
: forming link portion, which is the part thereo~ which first melts under excessive current flow~ so heat does not accumu~
late which would adversely affect the current at which the fuse will blow.
; The narrow and wide portions 44-44 and 44' of the space within the houslng 6 open onto the bottom of the ~;: housing for the full extent thereof through an entry open-:~ ing 48. The opening 48 permits the housing to be pushed . over the end portion or end blank of the pre-stamped and : 10 milled strip 4' from which a completed fuse element is punched immediately following the securing of the housing 6 to the end portion or end blank of the strip as previously - ind~cated.
The housing 6 is preferably a molded part made of : ~ a tran~parent synthetic plastic material so that the fuse-forming filament portion 20 of the plug-in fuse element 4 ~ I
is readily visible throuyh the intermediate portion of the ,~ outer wall 38, to which the fuse-forming link portion 20 ~ is in spaced but relatively contiguous relation. The housing ;1 2Q is prefera~ly molded of a high temperature transparent nylon ~ made by Belding Chemical Industries of New York City, New ~;
-;: York ~Product Code No. LX~3330).
. While the housing interior 6 could be made with resilient projections which snap into the anchoring apertures 26-26 and 28-28 in the plugin fuse element 4, it is preferred J to secure the housing in place by forming projections 52 and 54, hy a cold staking operation, ultrasonic melting or other opération, which enter the anchoring aper-tures 26-26 ; and 28-28 of the plug-in fuse element 4, The depressions 56 and 58 left by a s-taking operation are shown in the side wall 30 in Figs. 1 and 6.
To improve the visibility of the fuse-forming , c~i - 20 -.
~L05~ 2 link portion 20 of the plug-in fuse element, the outer wall o~ the housing of the fuse assembly can be modified as shown in Fig. 11 where the housing outer wall 38' of a modified fuse assembly 2' is thickened and curved to form a magnifying lens. Also, as shown in Fig. 12, the fuse as~embly 2' is a ~ low current rated fuse assembly as evidenced by the absence ,~ of wings on the terminal-forming blade portion 8'-8' on - the plug-in fuse element 4'.
, The exemplary embodiments of the invention just ,, 10 described have thus provided an exceedingly reliable, - compact and inexpensive to manufacture plug-in fuse assembly ,' which can be readily inserted into and removed from suitable closely spaced spring clip terminal connectors in a mounting panel ~y grasping the shoulders 40-40 at the longitudinal , , . .
ends of the hous~ng 6. The transparent material out of which the housing 6 is made forms a convenient window in the outer .. .. . . .
! wall through ~hich the ~use-forming link portion of the plug- -in fuse element can be vlewed when the plug-in fuse assembly i is m~unted on the mounting panel. rrhe terminal access open-,, 20 ings enable test equipment to test the continuity of the , fuse if the user does not desire to rely sole y on a visual observation of the fuse-forming link portion of the ~use.
, The presence or absence of wings on the terminal-forming " blade portion of the'plug-in f'use element immediately informs '~
the user whether he has selected a relatively high or low ~ ~ ' current rated fuse, although the indicia 13 should be ~ ' ~.
examined to determine the actual current rating. ~-The preferred method of making the plug-in fuse ,~
as~embly is illustrated in E'igs.13, 14, 15, 9 and 10. It ' includes providlng a continuous strip 4' of a f'use metal which is sequentially advanced the distance of a blank 4" between ' ' distances 4"' as indicated in dotted lines in these figures. ~ ' ,; ~ , .
'.
~b/ - 21 -.. . ..
~5~ .
In Fig. 13 the strip 4' is provided at spaced intervals with a milled portion 60, the milled portion 60 being pro-vided in the appropriate place in each blank 4"~ There-after, at each milled portion 60 each blank is squeezed or compressed as indicated at 62 in Fig. 14 to provide by ; squeezing or pressing a depression in the blank having curved surfaces 24a 24a and a flattened intermediate portion 24b as referred to above in connection with Fig. 8.
After the appropriate depression is formed in each blank 4", the advancing strip 4' is then blanked to form the terminal portions 8, the current carrying ex-tensions 14 thereof and the further extensions 18 thereof. This may be accomplished in one blanking operation or in a plural-ity of blanking operations. As illustrated herein, the blanking operation is accomplished in two steps. The -first blanking step in the sequentially advancing strip 4' is illustrated in Fig. 15 wherein each blank 4ll is seguentially blanked as indicated at 64 to provide the extensions 18 and a portion of the fuse link 20 having the tapered portions 22. Thereafter, each blanX is sequ~ntially blanked as illustrated in Fig. 9 at 66 to provide the current carrying extensions 14 and the other part of the fuse link 20 extend-ing between the current carrying extensions 14 having the tapered portions 22. During this same blanking operation the interlocking holes 26 and 28 are also blanked. In this blanking operation the transverse web 10' still remains between the terminal forming blade portions 8 of each blank.
As shown in Fig. 9, the houslng 6 is inserted over the end blank 4" to receive the current carrying extensions 14 and the fuse link 20 within the housiny and with the terminal forming blade portions 8 still lnterconnected by the txansverse web 10' extending from the housing. The housing "
cb/ - 22 -is then cold s-taked and/or ultrasonically secured in -the interlock openings 26 and ~8 of the end blank 4" as indica-ted ~; - at 56, 58 in Figs. 6 and 10. Preferably, the placing of the housing 6 over the end blank 4" and securing the housing to the end blank occurs before severing the end blank from the strip at the blank edye 4'''. In Fig. 10 the end hlank 4" and its housing 6 are severed from the strip 4' at the blank edge 4 " ' of the end of the blank 4''' to form the substantially completed plug-in fuse assembly, but with the transverse web 10' still intact. Thereafter, the --transverse ~e~ 10' is blanked at 12 to provide the spaced apart terminal forming blade portions 8 as indicated at Fig. 10. Here, the blanking of the transverse web may provide wings 10 as illustrated in Fig. 10 or the wings may be eliminated ~s illustrated in Fig. 12. Thereafter, :.-the ends of the ter~inal forming blade portions 8 may be ~ coined as illustrated at 9 to form tapered ends for the ~-.
blade portions. In this ~ay, the c:omplete plug-in fuse ass~bly as illustrated in Figs. 10 and 1 may be provided.
- 20 While for purposes oE illustration herein one I preferred specific method of making the plug-in ~use assembly i .
has been disclosed herein, other methods may become appar-ent to those skilled in the art and therefore this invention is to be limited only by the scope of the appended claims.
:
, . . :: .
~, , ~ ..... ...
, . 1 , ~ , ,., ". .. ..
' .
cb/ - 23 -.,
Claims (52)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A plug-in fuse element comprising a one-piece plate-like body of fuse metal which body comprises a pair of juxtaposed, laterally spaced, generally parallel and coplanar terminal-forming blade portions to be re-ceived by pressure clip terminals in a mounting panel, the terminal-forming blade portions having current-carrying extensions at the inner end portions thereof which are interconnected by a fuse-forming link portion of much smaller cross-sectional area than said terminal-forming blade portions and the current-carrying extensions thereof.
2. The plug-in fuse element of claim 1 wherein said fuse-forming link portion of said plate-like body is both narrower in width and thinner in thickness than the terminal-forming blade portions and current-carrying extension thereof.
3. The plug-in fuse element of claims 1 or 2 wherein said current-carrying extensions of said terminal-forming blade portions have apertures for receiving inter-locking projections of a housing into which the plug-in fuse element can be inserted.
4. The plug-in fuse element of claim 3 combined with insulating means extending between said current-carrying extensions and immovably affixed, thereto, said insulating means forming an insulated gripping body for the plug-in fuse element.
5. The plug-in fuse element of any of claims 1-3 wherein said terminal-forming blade portions have wings projecting transversely away from the rest of the terminal-forming blade portions to identify a relatively large current-carrying capacity of the fuse element.
6. The combination of claim 4 wherein it consists solely of a one-piece housing forming said insulating means and said plug-in fuse element closely enveloped by said housing.
7. The combination of claim 6 wherein said housing is open at the inwardly facing side thereof for the full width of the plug-in fuse element so as initially to receive said plug-in fuse element when it is assembled therewith.
8. The combination of claim 1 wherein the plug-in fuse element is a one-piece sheet metal stamping from a sheet of fuse metal.
9. The combination of claim 4 wherein said insulating means is a housing having an outer wall positioned opposite the fuse-forming link portion of the plug-in fuse element and facing in the opposite direction from the direction in which said termi-nal-forming blade portions of the plug-in fuse element extend, said outer wall forming at least part of a shield preventing the outward spewing of fuse metal under fuse blowing current conditions.
10. The combination of claim 9 wherein said outer shield-forming wall is transparent at least at the portion where it is contiguous to the portion of the fuse-forming link portion which will blow under fuse blowing current conditions.
11. The combination of claim 4 wherein said insulating means is a one-piece housing enclosing said fuse-forming link portion.
12. The combination of claim 4 wherein said insulating means is a housing having terminal access openings which expose said current-carrying extensions, and said housing providing shield wall means for preventing the spewing of blown fuse metal outside of the housing when fuse blowing current flows through said fuse link, the defining walls of said access openings having skirt portions extending inwardly therefrom which, in conjunction with other wall portions of the housing, act as said shield wall means to prevent blown fuse material from.
spewing outside of the housing.
spewing outside of the housing.
13. The combination of claim 12 wherein said access openings have inwardly tapering walls to guide resistance measuring test probes into continuity measuring positions within the housing.
14. The combination of claim 12 wherein said terminal-forming blade portions of the plug-in fuse element project in the same direction from one side of the housing thereof, said housing having an outer wall facing in the opposite direction from the direction in which said terminals-forming blade portions project, and said terminal access openings are in said outer wall of the housing.
15. The combination of claim 6 or 7 wherein said housing is defined by closely spaced side walls, end walls bridging the end portions of the side walls and an outer wall bridging the outer margins of the side walls, at least a part of said housing being made of substantially transparent material permitting visibility of a part of the interior of the housing at this point.
16. The plug-in fuse element of claim 2 wherein said fuse link portion has a width many times greater than the thickness thereof.
17. The combination of claim 6 or 7 consisting solely of said housing made of insulating material and plug-in fuse element made entirely of metal, said housing is defined by closely spaced side walls, end walls bridging the end portions of the side walls and an outer wall bridging the outer margins of the side walls, said housing and plug-in fuse element having interlocking means for securing the plug-in fuse element within the housing, and said housing providing a narrow space which closely receives the current carrying extensions of said plug-in fuse element and a relatively wide space adjacent the fuse-forming link portion, thereof, and said housing forming an insulated gripping body for the assembly and a shield for spewing blown fuse metal of said fuse-forming link portion of the plug-in fuse element when the current rating thereof is exceeded.
18. The combination of claim 4 wherein said insulat-ing means is a housing including closely spaced side walls, and an outer wall bridging the outer margins of the side walls, at least an intermediate portion of said outer wall being made of substantially transparent material permitting visibility of the interior of the housing at this point;
said fuse-forming link portion of said plug-in fuse element being visible in said transparent portion of said outer wall of the housing and said outer housing wall terminating at the ends of the housing in outwardly projecting finger gripping portions permitting the housing to be gripped between fingers extending over the opposite longitudinal end portions of the housing, whereby a number of fuse assemblies can be closely spaced on a support panel with the fuse links therein visible through the outer wall thereof and be readily inserted into or removed from pockets despite the very close spacing between the lateral sides of similar fuse assemblies to be received by female pressure clip terminals or the like in a mounting panel.
said fuse-forming link portion of said plug-in fuse element being visible in said transparent portion of said outer wall of the housing and said outer housing wall terminating at the ends of the housing in outwardly projecting finger gripping portions permitting the housing to be gripped between fingers extending over the opposite longitudinal end portions of the housing, whereby a number of fuse assemblies can be closely spaced on a support panel with the fuse links therein visible through the outer wall thereof and be readily inserted into or removed from pockets despite the very close spacing between the lateral sides of similar fuse assemblies to be received by female pressure clip terminals or the like in a mounting panel.
19. The combination of claim 18 wherein said terminal and fuse link-forming portions of said plug-in fuse element forms a one-piece stamping from a sheet of fuse metal.
20. The combination of claim 4 wherein the combina-tion consists solely of said plug-in fuse element and said insulating means forming a housing having closely spaced side walls which encloses said fuse-forming link portions of said plug-in fuse element, and said housing providing a narrow space which closely receives the current-carrying extensions of said plug-in fuse element, and said housing forming a shield for the spewing blown fuse metal of said fuse-forming link portion of the plug-in fuse element when the current rating thereof is exceeded.
21. The combination of claim 20 wherein said housing is a one-piece molded synthetic plastic member which is open at the inwardly facing side thereof for the full width of the plug-in fuse element so as initially to receive said plug-in fuse element when it is assembled therewith.
22. The combination of claim 20 wherein said plug-in fuse element is made of a single integral body of fuse metal.
23. A plug-in fuse assembly consisting solely of a housing made of insulating material and an all metal one-piece plug-in fuse element secured within said housing, said housing having closely spaced side walls and an outer wall bridging the outer margins of the side walls, said housing and plug-in fuse element having interlocking means for securing the plug-in fuse element within the housing, said plug-in fuse element having a pair of terminal forming blade portions to be received by pressure clip terminals in a mounting panel and projecting in laterally spaced parallel relation from said housing on the side thereof opposite to that containing said outer wall, the terminal-forming blade portions having longitudinal current-carrying extensions at the inner end portions thereof which are interconnected by a fuse-forming link portion, said terminal-forming blade portions of the plug-in fuse element being in substantially coplanar relation with one another, said current-carrying extensions thereof and said fuse-forming link portion, and said housing providing a narrow space which closely receives the current-carrying extensions of said plug-in fuse element and a relatively wide space adjacent the fuse-forming link portion, and said housing forming an insulated gripping body for the plug-in fuse assembly and a shield for spewing blown fuse metal of said fuse-forming link portion of the plug-in fuse element when the current rating thereof is exceeded.
24. A method of making a plug-in fuse element comprising a pair of juxtaposed laterally spaced generally parallel terminals to be received by pressure clip terminals or the like, the terminals having current-carrying extensions at the inner end portions thereof which are to be interconnected by a fuse link, said method comprising: providing a blank comprising a sheet-like body of fuse metal, and blanking said sheet-like body of fuse metal to form a pair of terminals and a fuse-forming link portion interconnecting said terminals, said fuse-forming link portion being substantially smaller in cross-sectional area than the other portions of the blanked body of fuse metal.
25. A method of making a plug-in fuse element comprising a pair of juxtaposed laterally spaced generally parallel terminals to be received by pressure clip terminals or the like, the ter-minals having current-carrying extensions at the inner end por-tions thereof which are to be interconnected by a fuse link, said method comprising: providing a blank comprising a sheet-like body of fuse metal, and blanking said sheet like body of fuse metal to form parallel justaposed laterally spaced terminal forming blade portions, current-carrying extensions at the inner end por-tions of the terminal forming blade portions thereof and a fuse-forming link portion interconnecting said current-carrying exten-sions, said fuse-forming link portion being substantially smaller in cross-sectional area than the other portions of the blanked body of fuse metal.
26. The method of claim 25 wherein prior to said blank-ing step the body of fuse metal is reduced in thickness in the areas thereof in which said fuse-forming link portion is to be formed so such portion is both narrower in width and thinner in thickness than the terminal-forming blade portions and current-carrying extensions.
27. The method of claim 26 wherein said fuse-forming link portion of the body of fuse metal extends transversely between said current-carrying extension of the terminal-forming blade portions thereof.
28. The method of claim 25 further including the step of applying over the blanked body of fuse metal a housing made of insulating material which is open at the inwardly facing side thereof for the full width of the plug-in fuse element so as initially to receive said plug-in fuse element therethrough when it is assembled therewith, and said housing and plug-in fuse element are anchored together after assembly.
29. The method of claim 25 further including the step of applying immediately over said plug-in fuse element a housing made of insulating material including closely spaced side walls, which closely envelop said current-carrying extensions of said plug-in fuse element.
30. The method of claim 29 wherein said housing and plug-in fuse element are interlocked by projections formed in said housing which enter apertures in the plug-in fuse element.
31. The method as defined in claim 30 wherein the insulating material is ultrasonically heated where it is staked into the apertures in the blank.
32. A method of making a plug-in fuse element comprising a plug-in element including a pair of terminals to be received by pressure clip terminals or the like, and a fuse-forming link forming an interconnection between the terminals, said method comprising the steps of providing a blank of fuse metal where the blank is initially provided with a portion of reduced thickness, and blanking said blank to form a pair of terminals which are interconnected by a fuse-forming link portion formed in said portion of reduced thickness, so that the fuse-forming link portion of the blank is of much less thickness and cross sectional area than the terminals.
33. The method as defined in claim 26 wherein the portion of reduced thickness of the blank of fuse metal is reduced by milling.
34. The method as defined in claim 26 wherein the portion of reduced thickness of the blank of fuse metal is reduced by milling and subsequent squeezing.
35. The method of claim 25 wherein a plurality of said plug-in fuse elements are formed from blanks contained in a continuous strip of fuse metal by sequentially advancing the continuous strip to provide at spaced intervals in said strip longitudinally interconnected blanks each comprising a pair of spaced confronting generally parallel terminal portions extending longitudinally along the strip, and a pair of current-carrying extensions of the terminal portions extending longitudinally along the strip and providing also a fuse-forming link extending laterally of the strip and between each pair of said current-carrying extensions thereof, and severing end blanks from the strip.
36. The method of claim 35 wherein there is added between the current-carrying extensions of said blank rigid insulating means which forms a rigid interconnection therebetween, with the pair of terminals of each blank from the insulating means.
37. The method of claim 36 wherein the insulating means applied to each blank forms also a housing enclosing the fuse-forming link portion thereof.
38. The method as defined in claim 35 wherein the se-quentially advanced continuous strip of fuse metal before it is blanked is initially provided with portions of reduced thickness within which the fuse-forming links are formed so that, when the strip of fuse metal is blanked, the interconnecting fuse-forming links of the longitudinally interconnected blanks are of less thickness than the spaced terminals thereof.
39. The method as defined in claim 38 wherein the por-tion of reduced thickness in the strip of fuse metal are arranged at longitudinally spaced intervals in the strip.
40. The method of claim 35 wherein there is provided the step of applying and securing over each end blank a housing of insulating material with the current-carrying extensions and the fuse link-forming portion of the end blank within the housing and with said pair of terminals of the end blank extending outwardly from the housing, said housing closely enveloping said current-carrying extensions but being spaced from said fuse link.
41. The method as defined in claim 40 wherein applying the housing over the end blank occurs before severing said end blank from the strip.
42. The method of claim 25 wherein said fuse-forming link portion formed in said blank is weak or fragile and wherein said method includes the steps of forming in said blank. of fuse metal by said blanking step a rigid web between said pair of spaced juxtaposed parallel terminals, securing between said current carrying extensions formed in said blank a body of insulating material forming a rigid interconnection between said current carrying exten-sions thereof, with the pair of terminals interconnected by the web on the outside of the body of insulating material, and then blanking the exposed web of fuse metal interconnecting the terminals.
43. The method as defined in claim 42 wherein the blank of fuse metal is initially provided with a portion of reduced thickness so that, when the blank is blanked, the interconnecting fuse-forming link portion of the blank is of less thickness than the terminals and current-carrying extensions.
44. The method as defined in claim 42 wherein the blank has interlock openings, and wherein the body of insulating material is staked into the interlock openings in the blank for securing the blank to the insulating body.
45. The method as defined in claim 44 wherein the insulating body is ultrasonically heated where it is staked into the interlock openings in the blank.
46. The method of claim 42 performed on a continuous strip of fuse metal forming a number of interconnected blanks, said method including the steps of advancing the continuous strip, blanking said blanks in said continuous strip to provide at spaced intervals in said strip longi-tudinally interconnected blanks each containing a pair of spaced terminals which are interconnected by a rigid web of the strip, a spaced pair of current carrying extensions for the terminals, and a relatively weak fuse link between each pair of current carrying extensions, severing the end blanks from the strip and securing over each end blank said body of insulating material with the pair of terminals of the end blank, which are interconnected by the web of the strip, projecting from the insulating body and then blanking the transverse web of each end blank.
47. The method as defined in claim 46 wherein said insulating body is applied to the end blank before it is severed from the strip.
48. The method of claim 42 wherein said pair of juxta-posed spaced parallel terminals and current carrying extensions of each blank extend longitudinally along the strip and said rigid web and fuse link of each blank extend laterally across the strip.
49. The method as defined in claim 42 wherein the sequentially advanced continuous strip of fuse metal before it is blanked is provided with portion of reduced thickness wherein the fuse-forming links are formed when the strip of fuse metal is blanked, so that the interconnecting fuse-forming links of the longitudinally interconnected blanks are of less thickness than the spaced terminals thereof.
50. The method as defined in claim 49 wherein the said provided reduced thickness in the strip of fuse metal is arranged at longitudinally spaced intervals in the strip.
51. The method as defined in claim 42 wherein each insulating body is a single piece body having an opening at the inwardly facing side thereof, and said insulating body is inserted over said end blank by way of the opening at the inwardly facing side thereof.
52. A method of making a plug-in fuse assembly comprising a plug-in element including a pair of terminals to be received by pressure clip terminals or the like, and a fuse-forming link interconnecting the terminals, said method comprising the steps of providing a blank of fuse metal which is blanked to contain a pair of terminals which are inter-connected by a rigid web, and a relatively weak fuse-forming link portion interconnecting said terminals, anchoring across the portion of the blank interconnected by said fuse-forming link a body of insulating material forming a rigid interconnection therebetween, with the pair of terminals interconnected by the web on the outside of the body of the insulating material, and blanking the web of fuse metal interconnecting the terminals, said fuse-forming link portion being substantially smaller in cross-sectional area than the other portions of the blanked body of fuse metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA313,920A CA1061385A (en) | 1974-01-14 | 1978-10-23 | Miniature plug-in fuse and method of making same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US432980A US3909767A (en) | 1974-01-14 | 1974-01-14 | Miniature plug-in fuse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1050592A true CA1050592A (en) | 1979-03-13 |
Family
ID=23718358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA217,829A Expired CA1050592A (en) | 1974-01-14 | 1975-01-13 | Miniature plug-in fuse and method of making same |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3909767A (en) |
| JP (1) | JPS5436726B2 (en) |
| CA (1) | CA1050592A (en) |
| DE (4) | DE2500364C2 (en) |
| GB (1) | GB1500183A (en) |
| HK (1) | HK64781A (en) |
Families Citing this family (78)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6114125Y2 (en) * | 1977-01-31 | 1986-05-01 | ||
| US4099322A (en) * | 1977-02-07 | 1978-07-11 | Littelfuse, Inc. | Method for making plug-in fuse assemblies |
| US4067103A (en) * | 1977-02-07 | 1978-01-10 | Littelfuse, Inc. | Method of making a plug-in fuse |
| DE2714797A1 (en) * | 1977-04-02 | 1979-02-22 | Kromberg & Schubert | Plug type fuse with insulating case - has plug bar on case holding two contact blades connected by fusible link visible for inspection |
| DE2722008A1 (en) * | 1977-05-14 | 1978-11-16 | Kromberg & Schubert | Fused plug for protecting electrical circuit - has transparent window for observing or indicating condition of fusible element |
| DE2729452C3 (en) * | 1977-06-30 | 1980-06-12 | Grote & Hartmann Gmbh & Co Kg, 5600 Wuppertal | Blade fuse |
| AU518330B2 (en) * | 1977-07-07 | 1981-09-24 | Amp Incorporated | Fuse |
| JPS6226910Y2 (en) * | 1977-09-29 | 1987-07-10 | ||
| JPS54133343U (en) * | 1978-03-09 | 1979-09-14 | ||
| JPS54144138U (en) * | 1978-03-30 | 1979-10-06 | ||
| US4224592A (en) * | 1978-04-03 | 1980-09-23 | Mcgraw-Edison Company | Miniature plug-in fuse assembly and method of manufacture |
| US4221455A (en) * | 1979-03-01 | 1980-09-09 | Ford Motor Company | Fuse terminal block with alternative means for connection to fuse blade contacts |
| US4226493A (en) * | 1979-03-01 | 1980-10-07 | Ford Motor Company | Terminal block with fuse guards and identification surface |
| JPS56501663A (en) * | 1979-12-03 | 1981-11-12 | ||
| DE2949432C2 (en) * | 1979-12-08 | 1986-08-07 | Georg Rudolf 8411 Zeitlarn Sillner | Plug-in fuse |
| US4344060A (en) * | 1980-09-19 | 1982-08-10 | Littelfuse, Inc. | Enclosed plug-in fuse assembly |
| US4391485A (en) * | 1981-01-09 | 1983-07-05 | Mcgraw-Edison Company | In-line fuse holder for miniature plug-in fuse |
| DE3115435A1 (en) * | 1981-04-16 | 1982-11-11 | Grote & Hartmann Gmbh & Co Kg, 5600 Wuppertal | "FLAT FUSE AND METHOD FOR THEIR PRODUCTION" |
| DE3138206A1 (en) * | 1981-09-25 | 1983-04-07 | Bayerische Motoren Werke AG, 8000 München | Electrical fuse link and a method for its production |
| US4409582A (en) * | 1982-06-02 | 1983-10-11 | Amp Incorporated | Electrical fuse and method of making same |
| US4394638A (en) * | 1982-07-21 | 1983-07-19 | Essex Group, Inc. | Miniature plug-in fuse assembly and method of making a fuse element therefor |
| CA1203826A (en) * | 1982-08-05 | 1986-04-29 | Kabushiki Kaisha T An T | Compact fuse block assembly |
| US4499447A (en) * | 1983-06-17 | 1985-02-12 | Guim Multi-Tech Corporation | Blade terminal fuses with integrity indicator |
| WO1986004456A1 (en) * | 1985-01-18 | 1986-07-31 | Visual Fuse, Incorporated | Blade terminal fuses with integrity indicator |
| JPS62246219A (en) * | 1986-04-18 | 1987-10-27 | 矢崎総業株式会社 | Terminal with fuse |
| US4670729A (en) * | 1986-06-03 | 1987-06-02 | Littelfuse, Inc. | Electrical fuse |
| DE3739051C2 (en) * | 1986-11-19 | 1995-02-23 | Yazaki Corp | Fuse |
| US4780698A (en) * | 1987-04-30 | 1988-10-25 | Texas Instruments Incorporated | Circuit interrupter device and method for making |
| US4802869A (en) * | 1987-08-17 | 1989-02-07 | United Technologies Automotive, Inc. | Probeable electrical connector |
| US4806118A (en) * | 1988-01-19 | 1989-02-21 | General Motors Corporation | Fuse package |
| US4836802A (en) * | 1988-06-30 | 1989-06-06 | Brunswick Corporation | Sealed fuse holder |
| US4884050A (en) * | 1988-07-18 | 1989-11-28 | Kozel Emmett L | Blade terminal tap fuse |
| US4998086A (en) * | 1988-08-09 | 1991-03-05 | Amp Incorporated | Fuse assembly and method of manufacture |
| US4944691A (en) * | 1988-08-15 | 1990-07-31 | Cooper Industries, Inc. | Holder for a removable circuit element |
| DE3920198A1 (en) * | 1989-06-21 | 1991-01-10 | Wickmann Werke Gmbh | Electric safety fuse with disparate conductors in series - has one conductor embedded in quenching material and another conductor with different rating in air space |
| US4986767A (en) * | 1990-04-23 | 1991-01-22 | Kozel Emmett L | Blade fuse power tap |
| FR2685543B1 (en) * | 1991-12-20 | 1994-03-11 | Dav | FLAT FUSE FOR HIGH NOMINAL CURRENTS. |
| CA2100782A1 (en) * | 1991-01-16 | 1992-07-17 | Jean-Michel Saulgeot | Flat fuse for high rated currents |
| FR2671662B1 (en) * | 1991-01-16 | 1993-04-16 | Dav | FLAT FUSE FOR HIGH NOMINAL CURRENTS. |
| JPH052360U (en) * | 1991-06-25 | 1993-01-14 | 矢崎総業株式会社 | Pressure contact fuse |
| US5324214A (en) * | 1993-03-05 | 1994-06-28 | No Jack Corporation | Blade type fuse block terminal adapter |
| JP2747877B2 (en) * | 1993-10-28 | 1998-05-06 | 矢崎総業株式会社 | Slow fuse and manufacturing method thereof |
| US5418515A (en) * | 1993-12-22 | 1995-05-23 | Reyes; Daniel | Fuse interruption indicator and integral extractor |
| US5409402A (en) * | 1994-05-03 | 1995-04-25 | Ball; Roger M. | Plug-in fuse device with interchangeable fuse elements |
| JP3442159B2 (en) * | 1994-09-27 | 2003-09-02 | 矢崎総業株式会社 | fuse |
| JPH09223449A (en) * | 1995-10-20 | 1997-08-26 | Yazaki Corp | Fuse element |
| US5635769A (en) * | 1996-04-02 | 1997-06-03 | Magnadyne Corporation | Adaptable interface device for control of vehicle accessory systems using a plug-in resistor assembly |
| USD408367S (en) * | 1996-10-11 | 1999-04-20 | Magnadyne Corporation | Fuse |
| US6642834B1 (en) | 1999-03-04 | 2003-11-04 | Littelfuse, Inc. | High voltage automotive use |
| US6815841B1 (en) | 1999-11-03 | 2004-11-09 | Littelfuse, Inc. | Fuse arrangements and fuse boxes for a vehicle |
| US6407657B1 (en) | 2000-02-03 | 2002-06-18 | Littelfuse, Inc. | Dual use fuse |
| JP2001250466A (en) * | 2000-03-03 | 2001-09-14 | Taiheiyo Seiko Kk | Fuse element and fuse mounting device |
| JP2001283708A (en) * | 2000-03-31 | 2001-10-12 | Yazaki Corp | Fuse |
| JP2001291464A (en) * | 2000-04-06 | 2001-10-19 | Yazaki Corp | Fuse |
| JP3242095B2 (en) | 2000-05-16 | 2001-12-25 | 矢崎総業株式会社 | fuse |
| JP4104817B2 (en) * | 2000-11-22 | 2008-06-18 | 太平洋精工株式会社 | Blade type fuse |
| ATE547480T1 (en) * | 2001-04-19 | 2012-03-15 | Pacific Engineering Corp | POLYAMIDE RESIN COMPOSITION FOR SECURITY DEVICE |
| US6878004B2 (en) * | 2002-03-04 | 2005-04-12 | Littelfuse, Inc. | Multi-element fuse array |
| US7247269B2 (en) * | 2003-07-21 | 2007-07-24 | Biosense Webster, Inc. | Method for making a spiral array ultrasound transducer |
| DE112004002301T5 (en) * | 2003-11-26 | 2006-09-28 | Littelfuse, Inc., Des Plaines | Electrical protection device for a vehicle and system using the same |
| DE10358444A1 (en) * | 2003-12-13 | 2005-07-07 | Wilhelm Pudenz Gmbh | One-piece fuse-link, method for producing the one-piece fuse-link and device for carrying out the method |
| DE20319350U1 (en) * | 2003-12-13 | 2004-03-04 | Wilhelm Pudenz Gmbh | Fuse insert with flat insulating body |
| US7479866B2 (en) * | 2004-03-05 | 2009-01-20 | Littelfuse, Inc. | Low profile automotive fuse |
| WO2005124808A1 (en) * | 2004-06-18 | 2005-12-29 | Alpi Co., Ltd. | Fuse device |
| EP1797576A4 (en) * | 2004-09-15 | 2008-12-10 | Littelfuse Inc | High voltage/high current fuse |
| DE102004046387A1 (en) * | 2004-09-24 | 2006-04-06 | Amphenol-Tuchel Electronics Gmbh | Fuse for high current applications |
| DE102005024321B8 (en) * | 2005-05-27 | 2012-10-04 | Infineon Technologies Ag | protection circuit |
| US7983024B2 (en) | 2007-04-24 | 2011-07-19 | Littelfuse, Inc. | Fuse card system for automotive circuit protection |
| US7639112B2 (en) * | 2007-04-25 | 2009-12-29 | Sony Corporation | Fuse device with integrated switch |
| DE102007020989B4 (en) * | 2007-05-04 | 2013-10-10 | Autecto Industrievertretungen GmbH & Co. KG | Method for producing a fuse and fuse produced by the method |
| US8674803B2 (en) * | 2007-08-13 | 2014-03-18 | Littelfuse, Inc. | Moderately hazardous environment fuse |
| US7808362B2 (en) * | 2007-08-13 | 2010-10-05 | Littlefuse, Inc. | Moderately hazardous environment fuse |
| US8077007B2 (en) * | 2008-01-14 | 2011-12-13 | Littlelfuse, Inc. | Blade fuse |
| US7990738B2 (en) * | 2008-04-02 | 2011-08-02 | Littelfuse, Inc. | Master fuse module |
| EP2401755B1 (en) * | 2009-02-27 | 2018-06-06 | Littelfuse, Inc. | Tuning fork terminal slow blow fuse |
| US20130342305A1 (en) * | 2012-06-25 | 2013-12-26 | Jui-Chih Yen | Structure of positioning cover of miniature fuse device |
| DE102014222230A1 (en) * | 2014-10-30 | 2016-05-04 | Leoni Bordnetz-Systeme Gmbh | Pyrotechnic circuit breaker |
| JP6542589B2 (en) * | 2015-06-05 | 2019-07-10 | 矢崎総業株式会社 | Fuse soluble body |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE469935C (en) * | 1928-12-29 | Aeg | Melting strip fuse | |
| DE82905C (en) * | ||||
| US1926445A (en) * | 1932-01-27 | 1933-09-12 | Emmett P Klopfenstein | Fuse |
| US2512932A (en) * | 1947-10-20 | 1950-06-27 | Frederick A Gretschel | Fuse combination with replaceable fuse element |
| US2941059A (en) * | 1957-09-16 | 1960-06-14 | Gen Motors Corp | Printed circuit type fuse |
| DE1794807U (en) | 1958-01-02 | 1959-09-03 | Wickmann Werke Ag | FUSIBLE CONDUCTORS FOR SUPER FLEXIBLE FUSES. |
| GB963825A (en) | 1961-12-14 | 1964-07-15 | Gen Electric Co Ltd | Improvements in or relating to electric fuseholders |
| DE1865576U (en) * | 1962-11-10 | 1963-01-17 | Efen Elektrotech Fab | MELT STRIP. |
| DE6605723U (en) * | 1965-04-23 | 1970-06-25 | Standard Elektrik Lorenz Ag | PLUG-IN FLAT FUSE |
| GB1204505A (en) * | 1967-02-06 | 1970-09-09 | Lucas Industries Ltd | Fuses |
| US3436711A (en) * | 1967-11-20 | 1969-04-01 | Littelfuse Inc | Miniature current overload fuse |
| US3500463A (en) * | 1968-09-06 | 1970-03-10 | Essex International Inc | Fuse construction of non-conductive material with fusible coating |
| US3543210A (en) | 1969-04-03 | 1970-11-24 | Chase Shawmut Co | Current-limiting fuse having fuse link with longitudinal groove |
| US3729817A (en) * | 1971-09-30 | 1973-05-01 | Bourns Inc | Method of making rotatable element potentiometer |
| US3775723A (en) * | 1973-03-05 | 1973-11-27 | Gen Motors Corp | Circuit protector |
| US3775724A (en) * | 1973-03-05 | 1973-11-27 | Gen Motors Corp | Circuit protector |
-
1974
- 1974-01-14 US US432980A patent/US3909767A/en not_active Expired - Lifetime
-
1975
- 1975-01-07 GB GB627/75A patent/GB1500183A/en not_active Expired
- 1975-01-07 DE DE2500364A patent/DE2500364C2/en not_active Expired
- 1975-01-07 DE DE2560126A patent/DE2560126C2/en not_active Expired
- 1975-01-07 DE DE2560553A patent/DE2560553C2/de not_active Expired
- 1975-01-07 DE DE7500226U patent/DE7500226U/en not_active Expired
- 1975-01-13 CA CA217,829A patent/CA1050592A/en not_active Expired
- 1975-01-13 JP JP619475A patent/JPS5436726B2/ja not_active Expired
-
1981
- 1981-12-24 HK HK647/81A patent/HK64781A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| HK64781A (en) | 1981-12-31 |
| DE7500226U (en) | 1977-10-27 |
| GB1500183A (en) | 1978-02-08 |
| US3909767A (en) | 1975-09-30 |
| DE2500364A1 (en) | 1975-07-17 |
| DE2500364C2 (en) | 1984-01-26 |
| DE2560126C2 (en) | 1984-12-20 |
| JPS5436726B2 (en) | 1979-11-10 |
| DE2560553C2 (en) | 1988-01-07 |
| JPS50101845A (en) | 1975-08-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1050592A (en) | Miniature plug-in fuse and method of making same | |
| CA1247174A (en) | Plug-in fuse assembly | |
| US4023264A (en) | Method of making miniature plug-in fuses of different fuse ratings | |
| US4224592A (en) | Miniature plug-in fuse assembly and method of manufacture | |
| US5588884A (en) | Stamped and formed contacts for a power connector | |
| US4544907A (en) | Compact fuse block assembly | |
| CA1175871A (en) | Fuse assembly for a miniature plug-in fuse | |
| US4344060A (en) | Enclosed plug-in fuse assembly | |
| US4661793A (en) | Plug-in fuse assembly with specially configured fuse link | |
| US3962782A (en) | Method of making a miniature plug-in fuse | |
| US4023265A (en) | Method of making a miniature plug-in fuse | |
| US20010014560A1 (en) | High current terminal | |
| EP0198564A2 (en) | Plug-in fuse assembly | |
| EP0029836B1 (en) | Electrical interconnectors | |
| US4056884A (en) | Method of making a miniature plug-in fuse | |
| KR19990007917A (en) | Integrated female blade fuse with housing | |
| EP1935063B1 (en) | Multi-piece electrical receptacle terminal | |
| US5567187A (en) | Reverse insulation grip blade | |
| AU611057B2 (en) | Electrical connector | |
| JPH0734374B2 (en) | Electrical terminal | |
| KR970011881B1 (en) | Insulation displacement electrical connector | |
| US4040175A (en) | Method of making a miniature plug-in fuse with fragile fuse link | |
| US4682838A (en) | Multipolar plug | |
| EP0568927B1 (en) | Electrical socket terminal | |
| US5378162A (en) | Electrical plug bridge for an appliance plug |