US2007313A - Cartridge fuse - Google Patents
Cartridge fuse Download PDFInfo
- Publication number
- US2007313A US2007313A US646538A US64653832A US2007313A US 2007313 A US2007313 A US 2007313A US 646538 A US646538 A US 646538A US 64653832 A US64653832 A US 64653832A US 2007313 A US2007313 A US 2007313A
- Authority
- US
- United States
- Prior art keywords
- fuse
- barrel
- fuses
- blown
- cartridge fuse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 description 7
- 238000007664 blowing Methods 0.000 description 5
- 239000012780 transparent material Substances 0.000 description 5
- 238000004040 coloring Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 208000014674 injury Diseases 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 238000002845 discoloration Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010445 mica Substances 0.000 description 2
- 229910052618 mica group Inorganic materials 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000978 Pb alloy Inorganic materials 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- JPJALAQPGMAKDF-UHFFFAOYSA-N selenium dioxide Chemical compound O=[Se]=O JPJALAQPGMAKDF-UHFFFAOYSA-N 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/30—Means for indicating condition of fuse structurally associated with the fuse
Definitions
- This invention relates to improvements in fuses and more particularly to cartridge fuses such as are employed to protect electrical circuits.
- Fuses of this type have heretofore been made by using a fibre barrel to the opposite ends of which brass contact caps were secured. These caps are connected by a fuse wire which ,melts when an overload occurs in the circuit.
- Such fuses have proven highly satisfactory for the service in which they have been employed but the principal drawback to the use of such fuses is that due to the lack of transparency of the fibre barrel it is impossible to determine which fuse in a bank of fuses has blown. As a result much time and patience is expended in restoring a line on which a fuse has blown to working condition.
- the object of the present invention is to enable the user by a simple visual examination to determine which fuse or fuses in a bank have blown.
- Fig. 1 is a side view in elevation of a fuse constructed in accordance with this invention
- Fig. 2 is an enlarged longitudinal sectional view through the fuse shown in Fig. 1;
- Fig. 3 is a transverse sectional view taken on the line 33 of Fig. 2;
- my improved fuse designated generally Ill comprises a tubular barrel ii of transparent material such as the heat-resisting glass disclosed in U. S. Letters Patent No. 1,304,623 issued May 21, 1919, to Sullivan and Taylor, to the opposite ends of which are secured metal caps [2 which as shown in Fig. 1 are received in clips l3 carried by an insulating block l4. Interposed between the inner faces of the end Walls of the caps l2 and the ends of the barrel II are disks l5 of fibrous material. A lining l6 of transparent material such as a thin sheet of mica rolled into cylindricalform lies adjacent the inner side of the barrel H and serves as an armor which protects the barrel from injury by the heat generated by the blowing of the fuse. Soldered or otherwise secured-at opposite ends to the caps I2 is a fuse wire I! which is formed of an easily fused material such as a lead alloy so that when an overload occurs on the line the wire I! will melt and break the circuit.
- a fuse wire I! which is formed of an easily
- a fuse including a barrel of transparent material, metal capsat opposite ends of the barrel, a fuse wire within the barrel and electrically connecting the caps, a thin transparent heat resisting lining in intimate contact with the interior of the barrel throughout its entire length to protect the latter from injury by the heat generated by the blowing of the fuse wire, arc quenching material filling the space within the lining and coloring oxide carried by the fuse wire and adapted to be vaporized by the heat generated by the blowing of the fuse and dispersed throughout the arc quenching material.
Landscapes
- Fuses (AREA)
Description
July 1935c R. G. SHERWODD 2,007,313
CARTRIDGE FUSE Filed Dec. 9, 1952 lNVENTOR Foauer 6. LSHERWOOD. BY
ATTORNEY Patented July 9, 1935 PATENT OFFICE CARTRHIIGE FUSE Robert G. Sherwood,
Corning, N. Y., assignor to Corning Glass Works, Corning, N. Y., a corporation of New York Application December 9, 1932, Serial No. 646,538
1 Claim.
This invention relates to improvements in fuses and more particularly to cartridge fuses such as are employed to protect electrical circuits.
Fuses of this type have heretofore been made by using a fibre barrel to the opposite ends of which brass contact caps were secured. These caps are connected by a fuse wire which ,melts when an overload occurs in the circuit. Such fuses have proven highly satisfactory for the service in which they have been employed but the principal drawback to the use of such fuses is that due to the lack of transparency of the fibre barrel it is impossible to determine which fuse in a bank of fuses has blown. As a result much time and patience is expended in restoring a line on which a fuse has blown to working condition.
The object of the present invention is to enable the user by a simple visual examination to determine which fuse or fuses in a bank have blown.
The above and other objects may be attained by employing my invention which embodies among its features forming the barrel which encloses the fuse wire of transparent material and protecting the transparent barrel from injury by the heat generated by the blowing of the fuse.
Fig. 1 is a side view in elevation of a fuse constructed in accordance with this invention;
Fig. 2 is an enlarged longitudinal sectional view through the fuse shown in Fig. 1; and
Fig. 3 is a transverse sectional view taken on the line 33 of Fig. 2;
Referring to the drawing in detail, my improved fuse designated generally Ill comprises a tubular barrel ii of transparent material such as the heat-resisting glass disclosed in U. S. Letters Patent No. 1,304,623 issued May 21, 1919, to Sullivan and Taylor, to the opposite ends of which are secured metal caps [2 which as shown in Fig. 1 are received in clips l3 carried by an insulating block l4. Interposed between the inner faces of the end Walls of the caps l2 and the ends of the barrel II are disks l5 of fibrous material. A lining l6 of transparent material such as a thin sheet of mica rolled into cylindricalform lies adjacent the inner side of the barrel H and serves as an armor which protects the barrel from injury by the heat generated by the blowing of the fuse. Soldered or otherwise secured-at opposite ends to the caps I2 is a fuse wire I! which is formed of an easily fused material such as a lead alloy so that when an overload occurs on the line the wire I! will melt and break the circuit.
While it is not an essential to the operation of my invention, I find it desirable to fill the barrel H with a finely divided arc quenching material l8 such as magnesium oxide commonly known to the trade as Shamva so that when the fuse wire l1 melts any are which may tend to form between the ends of the blown fuse wire will be speedily extinguished. The introduction of this finely divided material I find does not affect the ability of the user to readily detect the blown fuse where relatively high overloads are encountered as there is suflicient discoloration of the blown'fuse to make it readily distinguishable from those which are still conducting. However, for lesser overloads, I find it desirable to incorporate within it a coloring material which is dispersed throughout the Shamva when the fuse blows. While I do not wish to be restricted to any specific coloring material nor method of employing it, I find it convenient to make a paste by mixing selenium oxide and sodium silicate and then apply a drop of this mixture directly to the fusible link II at or near the point where it is expected to blow. With the blowing of the link, the heat generated vaporizes the selenium and produces a decided red color which is dispersed throughout the Shamva filler and in some instances will be found adhering to the glass. Such a method of coloring has been found satisfactory when the overload necessary to blow the fuse has been as little as 10%.
Obviously I may if I find it desirable form the lining iii of a suitable transparent material other than mica, for instance, I may use a thin glass tube which will fit within the barrel i i preferably in slightly spaced relation thereto to increase the thermal resistance between them. While in the case of the glass inner tube little if any discoloration may be experienced, the fact that the fuse has been blown can be readily detected by the fact that the inner tube will have been cracked or crazed by the heat.
While in the foregoing I have shown and described the preferred embodiment of my invention, it is to be understood that minor changes in the construction, combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention as claimed.
What I claim is:
A fuse including a barrel of transparent material, metal capsat opposite ends of the barrel, a fuse wire within the barrel and electrically connecting the caps, a thin transparent heat resisting lining in intimate contact with the interior of the barrel throughout its entire length to protect the latter from injury by the heat generated by the blowing of the fuse wire, arc quenching material filling the space within the lining and coloring oxide carried by the fuse wire and adapted to be vaporized by the heat generated by the blowing of the fuse and dispersed throughout the arc quenching material.
ROBERT G. SHERWOOD.-
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US646538A US2007313A (en) | 1932-12-09 | 1932-12-09 | Cartridge fuse |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US646538A US2007313A (en) | 1932-12-09 | 1932-12-09 | Cartridge fuse |
Publications (1)
Publication Number | Publication Date |
---|---|
US2007313A true US2007313A (en) | 1935-07-09 |
Family
ID=24593436
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US646538A Expired - Lifetime US2007313A (en) | 1932-12-09 | 1932-12-09 | Cartridge fuse |
Country Status (1)
Country | Link |
---|---|
US (1) | US2007313A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4176350A (en) * | 1977-05-18 | 1979-11-27 | Patterson Billy J | Indicator to show whether a switch has opened |
US4603315A (en) * | 1984-09-20 | 1986-07-29 | Littelfuse, Inc. | Electrical fuse with pyrotechnic blowout indicator |
US4926153A (en) * | 1989-06-02 | 1990-05-15 | Cooper Industries, Inc. | Ceramic fuse wire coating |
US5262750A (en) * | 1989-06-02 | 1993-11-16 | Cooper Industries, Inc. | Ceramic coating material for a microfuse |
EP3889988A1 (en) * | 2020-04-02 | 2021-10-06 | Littelfuse, Inc. | Protection device with u-shaped fuse element |
-
1932
- 1932-12-09 US US646538A patent/US2007313A/en not_active Expired - Lifetime
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4176350A (en) * | 1977-05-18 | 1979-11-27 | Patterson Billy J | Indicator to show whether a switch has opened |
US4603315A (en) * | 1984-09-20 | 1986-07-29 | Littelfuse, Inc. | Electrical fuse with pyrotechnic blowout indicator |
US4926153A (en) * | 1989-06-02 | 1990-05-15 | Cooper Industries, Inc. | Ceramic fuse wire coating |
US5262750A (en) * | 1989-06-02 | 1993-11-16 | Cooper Industries, Inc. | Ceramic coating material for a microfuse |
EP3889988A1 (en) * | 2020-04-02 | 2021-10-06 | Littelfuse, Inc. | Protection device with u-shaped fuse element |
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