GB2068657A - Method of manufacturing electrical cartridge fuselinks and fuselinks manufactured by the method - Google Patents
Method of manufacturing electrical cartridge fuselinks and fuselinks manufactured by the method Download PDFInfo
- Publication number
- GB2068657A GB2068657A GB8038801A GB8038801A GB2068657A GB 2068657 A GB2068657 A GB 2068657A GB 8038801 A GB8038801 A GB 8038801A GB 8038801 A GB8038801 A GB 8038801A GB 2068657 A GB2068657 A GB 2068657A
- Authority
- GB
- United Kingdom
- Prior art keywords
- strip
- insulating
- fusible
- zones
- fusible member
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/041—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
- H01H85/0418—Miniature fuses cartridge type with ferrule type end 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
Abstract
A fuse element (15) for an electrical cartridge fuse comprises a fusible wire (2) secured to opposite end zones (3) of an insulating strip (1) by metallic layers (4) sprayed on to the end zones. The insulating strip has a slot therein between the end zones to prevent the fusible, central section of the wire from contacting the strip. The fuse element is disposed in an insulating barrel (16) and the layers (4) are soldered to end caps (17) of the barrel to connect the fusible wire thereto. Fuse elements of this construction are produced by disposing a fusible wire along a continuous strip of insulating material formed at equally spaced intervals with slots and spraying the metallic layers onto the strip between the slots so as to adhere the fusible wire to the strip. Thereafter, the strip is severed at the zones between the slots so as to produce individual fuse elements. This method of manufacture facilitates the production of cartridge fuses utilizing small diameter fusiblewires. <IMAGE>
Description
SPECIFICATION
Method of manufacturing electrical cartridge fuselinks and fuselinks manufactured by the method
The present invention relates to electrical cartridge fuselinks for protecting electrical and electronic equipment and, more particularly, to cartridge fuselinks intended to rupture at low current values.
Cartridge fuselinks having low current ratings utilize fusible wires of extremely small diameter. In many instances, they are barely visible to the naked eye. Hence, they are difficult to handle and often comprise metals or alloys which are difficult to solder. To facilitate the manufacture of cartridge fuselinks having these small diameter fuse wires and improve their operational reliability, it is known to mount the fusible wire on an insulating support with its opposite ends electrically connected to conductive end portions of the support and then to assemble the fuse element thus formed with an insulating barrel or tube. The fuse element is disposed within the insulating barrel and its conductive end portions are electrically connected to metal end caps or terminals fastened to opposite ends of the barrel.A number of different constructions of this type are disclosed by the prior art, for example, U.S. Patent
Nos. 2576405 (C.L.M. McAlister), 3348007 and 3568122 (both issued to A.Urani), 3530505 (E. Salzer) and U.K. Patent No.768136 (Belling & Lee Ltd).
McAlister and the first of the Urani patents disclose fuse elements in which the insulating support is of approximately the same length as the insulating barrel and a short length of fusible wire is disposed diagonally across the support and is soldered between conductive layers on the support which extend from its opposite ends to adjacent the centre of the support. The fusible wire is prevented from contacting the support by an aperture or rebate therein. When the fuse element is assembled within an insulating barrel the conductive layers are soldered to the end caps. The second Urani patent describes an arrangement in which the insulating support is somewhat shorter than the insulating barrel and the conductive layers at opposite ends of the support are connected to the adjacent end caps on the barrel by lead wires soldered to the conductive layers and the end caps.Salzer discloses a more complicated construction in which the insulating support serially mounts a plurality of fusible wire sections interconnected by conductive ribbon sections on the support and connected to the end caps of the cartridge fuse by such ribbon sections. The fusible wire sections are welded to the conductive ribbons and the outer ribbons are soldered to the end caps. The Belling & Lee patent describes a fuse element in which a fusible wire is disposed along the length of an elongated insulating support of approximately the same length as the insulating barrel and is clamped to opposite ends of the support by means of metal clips which have longitudinally projecting tongues. An aperture in the centre of the support prevents the fusible section of the wire from contacting the support.The fuse element is positioned in an insulating barrel and the tongues at opposite ends of the support project through apertures in end caps attached to the barrel and are bent over and secured to the outside of the associated end caps by soldering or spot welding.
Other patents of generally background interest are
U.S. Patent No. 1921392 (F.C. La Mar) and German
Patents Nos. 368033 (W. Pudenz) and 426301 (N.
Sandor).
The prior art constructions described above are all relatively expensive to manufacture and do not lend themselves to the mass production of cartridge fuselinks. It is an object of the present invention to provide a method of manufacturing cartridge fuselinks of the kind described which facilitates the use of mass production techniques and enables the production of a relatively inexpensive fuselink of novel construction.
The present invention consists in a method of manufacturing electrical cartridge fuselinks of the kind in which a fusible wire or other fusible member is mounted on an insulating support, between conductive end zones of the support, and the fuse element thus formed is disposed within an insulating barrel with the conductive end zones electrically connected to end caps or terminals of the barrel, characterized by the steps of disposing a fusible member along a strip of insulating material, adhering metallic layers to the fusible member and strip at spaced zones along the strip so as to attach the fusible member to the strip, and severing the fusible member and strip at the spaced attachment zones so as to produce fuse elements having fusible members attached at opposite ends to insulating supports by metallic layers.
The fuse elements produced by this invention may be mounted in insulating barrels or tubes. They may be approximately the same length as the barrels and the metallic layers at opposite ends of each fuse element may be soldered to the end caps or terminals of the associated barrel in order to produce a cartridge fuselink.
The metallic layers securing the fusible member in position are preferably produced by applying and hardening a layer or coating of a fluidized metallic material over the fusible member and strip. For example, the metallic layers may be applied by metal spraying or, alternatively, may be a metallic based electrically conductive adhesive which may be applied by screen printing orsimilartechniques.
Prior to application of the metallic layers, the fuse member may be temporarily attached in position along the insulating strip by applying s.-nall amounts of drops of a quick drying adhesive substance in the zones whereat the fusible member is to be subsequently secured to the strip. The metallic material of the layers is preferably one which can be readily soldered so as to permit the fusible member to be soldered to electrically conductive end caps or terminals via the metallic layers.
Instead of a simple fusible wire, the fusible member may be a fusible wire carrying eutectic blobs, a spirally wound fusible wire supported by a non-conductive former, or a plated or coated wire member, each of which would produce a fuse element having different electrical characteristics.
The insulating strip may have rebates formed in one side or surface thereof between the attachment zones so as to preclude the fusible section of the fusible member from contacting the strip and affecting the characteristics of the fuse element. Alternatively, for this purpose, the insulating strip may be formed with openings between the attachment zones. The fusible member may be adhered to the strip by applying the metallic layers over the whole or nearly the whole lengths of the zones between the rebates or openings, and by controlling the lengths of the latter and the spaces between the layers, the resistance of the fuse element can be precisely determined.
This invention is particularly useful for mass producing cartridge fuselinks intended to rupture at low current values, for example, below 200mA, when a fusible wire is of very small diameter. The invention enables such small diameter fusible wires to be easily handled during the production process of such fuselinks. The fuse elements produced may be readily inserted into insulating barrels and be secured to the electrically conductive end caps or terminals of the barrels by soldering the metallic layers to the end caps. They may be inserted into the insulating barrels either manually or by automatic means.
The invention also consists in an electrical cartridge fuselink in which a fuse element comprising a fusible wire or other fusible member mounted on an insulating support, between conductive end zones of the support, is disposed within an insulating barrel with the conductive end zones electrically connected to end caps or terminals of the barrel, characterized in that the fusible member extends substantially along the lengths of the support and is secured thereto at opposite end zones of the support by metallic layers adhered to the fusible member and the support.
In order that the invention may be more readily understood, reference will now be made to the accompanying drawings, in which Figure 1 is a perspective view of a fuse element manufactured by the invention,
Figure2 is a side elevation of an assembly of insulating strip and fusible wire illustrating one method of manufacturing the fuse element shown in
Figure 1,
Figure 3 is a plan view of the assembly shown in
Figure 2,
Figure 4 is a view similar to Figure 2 illustrating another manufacturing method in accordance with the invention,
Figure 5 is a plan view of the assembly shown in
Figure 4, and
Figure 6 is a perspective view, partially brokan away, of a miniature cartridge fuselink including a fuse element manufactured by the method illustrated in Figures 4 and 5.
Referring to Figure 1 of the drawings, the fuse element illustrated comprises an elongated insulating support 1 made from a strip of insulating material and having a fine fusible wire 2 extending along its length and attached to the support in spaced zones 3 at opposite ends of the latter. The wire 2 is adhered to the support by sprayed metal layers 4, the metal of these layers being one which can be readily soldered, for example, zinc. Between the zones 3, the insulating support is formed with a rebate 5 which prevents the central section of the fusible wire 2, which is intended to rupture in the event of an overload current, from contacting the support and affecting the characteristics of the fuse element.Moreover, the metal layers 4 extend for the full length of the zones or lands 3 so that the resistance of the fusible wire can be precisely determined by controlling the length of the rebate 5, and the length of the rebate can be aitered for different fuse ratings.
To produce a cartridge fuselink, the fuse element shown in Figure 1 is inserted into a suitable insulating barrel (not shown) and the sprayed metal layers 4 at opposite ends of the fuse element are connected by solder to end caps on the barrel, thereby electrically connecting the fusible wire to the end caps. It will be appreciated that the fuse element is easy to handle and assemble with the insulating barrel and end caps, and that the metal layers may be readily attached by solder to the end caps so as to produce the desired electrical connections.
The fuse element shown in Figure 1 may be severed from a strip of such fuse elements produced as illustrated in Figures 2 and 3. Hence, a strip 6 of insulating material is formed at equal intervals along its length with rebates 5 having a predetermined length dimension. A fine fusible wire 7 is disposed along the length of the strip and is secured to the raised zones or lands 8 at the ends of the rebates 5 by metal layers 9 which are sprayed over the wire where it extends across these zones. For the purposes of facilitating the spraying step, the wire may be temporarily attached to the strip beforehand with the aid of drops of a quick drying adhesive substance applied to the strip in at least some of the zones 8.
The metal forming the layers 9 is hot sprayed so as completely to cover the zones 8 and suitable masking may be used to provide for this whilst prohibiting the sprayed metal from depositing in the rebated areas. When cooled the sprayed metal layers adhere the fusible wire 7 to the insulating strip and, thereafter, the strip and wire are severed at the zones 8 and intermediate the ends thereof, such as, along the lines A-A, in order to separate the strip into individual fuse elements of the type shown in Figure 1.
Figures 4 and 5 illustrate another embodiment of this invention in which the fuse element produced have openings or slots between the wire attachment zones, instead of the rebates 5, to prevent the central, fusible sections of their fuse wires from contacting the insulating supports. Such fuse elements are formed from a strip 11 of insulating material, such as paper, having the openings 10 formed therethrough at substantially equally spaced positions along the length of the strip. A fusible wire 12 is disposed along the length of the strip and is secured to the latter at the zones 13 between the openings 10 by spraying metal layers 14, for exam- ple, zinc layers, as described in the previous embodiment. Thereafter, the strip is severed at the zones 13,
intermediate the openings, in order to separate the
strip into individual fuse elements.
Figure 6 illustrates a miniature cartridge fuselink
comprising a fuse element 15, produced by the
method described with reference to Figures 4 and 5,
an insulating barrel 16 made from transparent glass
or other insulating material, and metal end caps 17.
Opposite ends of the fuse element 15 are connected
to the inside top surfaces of the caps by solder blobs
18 melted about the element ends and bonded to the
metal layers 4. To assemble this fuselink, one cap 17
having a slug of solder adhered to its inside top
surface is firstly fastened over one end of the barrel
16 and then the fuse element 15, which is of
substantially the same length as the barrel, is
inserted into the barrel and its end adjacent the cap
is soldered thereto by the application of heat and a
light pressure. Thereafter the second cap 17 having a
slug of solder adhered to its inside top surface is
fastened in position over the opposite end of the
barrel with the application of heat and pressure so as
to solder the adjacent end of the fuse element to this
second end cap.
Whilst particular embodiments have been de
scribed, it will be understood that modifications can
be made without departing from the scope of the
invention as defined by the appended claims.
Claims (6)
1. A method of manufacturing electrical car tridgefuselinksofthe kind in which a fusible wire or
other fusible member (2) is mounted on an insulat
ing support (1), between conductive end zones (4) of
the support, and the fuse element (15) thus produced
is disposed within an insulating barrel (16) with the
conductive end zones electrically connected to end
caps or terminals (17) of the barrel, characterized by
the steps of disposing a fusible member (7, 12) along
a strip (6, 11) of insulating material, adhering
metallic layers (9,14) to the fusible member and strip
at spaced zones (8,13) along the strip so as to attach the fusible member to the strip, and severing the
fusible member and strip at the spaced attachment
zones so as to produce fuse elements (15) compris
ing fusible members (2) attached at opposite ends to
insulating supports (1) by conductive layers (4).
2. A method as claimed in claim 1, characterized
in that the metallic layers (9, 14) are produced by
applying a coating of fluidized metallic material to
the fusible member and strip and solidifying the
metallic material.
3. A method as claimed in claim 1 or 2, characte
rized in that, prior to the application of the metallic
layers (4), the fusible member (7, 12) is temporarily
attached in position to the insulating strip (6, 11) by
small amounts of a quick-drying adhesive substance
applied to the strip in the spaced attachment zones
(8,13).
4. A method as claimed in claim 1,2 or 3,
characterized in that the insulating strip (6,11) has
rebates (5) formed in one side thereof, or openings
(10) therethrough, at substantially equally spaced
positions along the strip, and the fusible member (7,
12) is adhered to the strip in the spaced zones between the rebates or openings.
5. . An electrical cartridge fuselink in which a fuse element comprising a fusible wire or other fusible member zones of the support, is disposed within an insulating barrel with the conductive end zones electrically connected to end caps or terminals of the barrel, characterized in that the fusible member extends substantially along the length of the insulating support and is secured thereto at the opposite end zones of the support by metallic layers adhered to the fusible member and the end zones of the support.
6. A fuselink as claimed in claim 5, characterized in that the insulating support has a rebate of
predetermined length in its side adjacent the fusible
member, oran opening of predetermined length
therethrough, between the end zones.
6. A fuselink as claimed in claim 5, characterized in that the insulating support has a rebate of predetermined length in its side or surface adjacent the fusible member, or an opening of predetermined length therethrough, between the end zones.
7. An electrical cartridge fuselink constructed substantially as hereinbefore described with reference to Figures 1,2 and 3 or Figures 4,5 and 6 of the accompanying drawings.
8. A method of manufacturing electrical cartridge fuselinks, substantially as hereinbefore described with reference to Figures 1,2 and 3 or
Figures 4, and 6 of the accompanying drawings.
New claims or amendments to claims filed on 8th
April 1981
Superseded claims 1, 4, 5 and 6
New or amended claims:
1. A method of manufacturing electrical cartridge fuselinks of the kind in which a fusible wire or other fusible member is mounted on one side of a strip-like insulating support, between conductive end zones of the support, and the fuse element thus produced is disposed within an insulating barrel with the conductive end zones electrically connected to end caps or terminals of the barrel, characterized by the steps of disposing a fusible member along one side of a strip of insulating material, adhering metallic layers to the fusible member and strip at spaced zones along the strip so as to attach the fusible member to the strip, and severing the fusible member and strip at the spaced attachment zones so as to produce fuse elements comprising fusible members attached at opposite ends to insulating supports by conductive layers.
4. A method as claimed in claim 1,2 or 3, characterized in that the insulating strip has rebates formed in said one side thereof, or openings therethrough, at substantially equally spaced positions along the strip, and the fusible member is adhered to the strip in the spaced zones between the rebates or openings.
5. An electrical cartridge fuselink in which a fuse element comprising a fusible wire or other fusible member mounted on one side of a strip-like insulating support, between conductive end zones of the support, is disposed within an insulating barrel with the conductive end zones electrically connected to end caps or terminals of the barrel, characterized in that the fusible member extends substantially along the length of the insulating support and is secured thereto at the opposite end zones of the support by metallic layers adhered to the fusible member and the end zones of the support.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8038801A GB2068657B (en) | 1979-12-03 | 1980-12-03 | Method of manufacturing electrical cartridge fuselinks and fuselinks manufactured by the method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7941695 | 1979-12-03 | ||
GB8038801A GB2068657B (en) | 1979-12-03 | 1980-12-03 | Method of manufacturing electrical cartridge fuselinks and fuselinks manufactured by the method |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2068657A true GB2068657A (en) | 1981-08-12 |
GB2068657B GB2068657B (en) | 1983-11-23 |
Family
ID=26273775
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8038801A Expired GB2068657B (en) | 1979-12-03 | 1980-12-03 | Method of manufacturing electrical cartridge fuselinks and fuselinks manufactured by the method |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2068657B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3401368A1 (en) * | 1984-01-17 | 1985-10-03 | AEG-Telefunken Kabelwerke AG, Rheydt, 4050 Mönchengladbach | Electrical melting fuse element |
US5440802A (en) * | 1994-09-12 | 1995-08-15 | Cooper Industries | Method of making wire element ceramic chip fuses |
CN116682695A (en) * | 2023-06-29 | 2023-09-01 | 佛山市通宝华龙控制器有限公司 | Temperature controller fuse-link fixed knot constructs and processing equipment |
-
1980
- 1980-12-03 GB GB8038801A patent/GB2068657B/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3401368A1 (en) * | 1984-01-17 | 1985-10-03 | AEG-Telefunken Kabelwerke AG, Rheydt, 4050 Mönchengladbach | Electrical melting fuse element |
US5440802A (en) * | 1994-09-12 | 1995-08-15 | Cooper Industries | Method of making wire element ceramic chip fuses |
CN116682695A (en) * | 2023-06-29 | 2023-09-01 | 佛山市通宝华龙控制器有限公司 | Temperature controller fuse-link fixed knot constructs and processing equipment |
CN116682695B (en) * | 2023-06-29 | 2024-01-30 | 佛山市通宝华龙控制器有限公司 | Temperature controller fuse-link fixed knot constructs and processing equipment |
Also Published As
Publication number | Publication date |
---|---|
GB2068657B (en) | 1983-11-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |