US956498A - Electric safety-fuse. - Google Patents
Electric safety-fuse. Download PDFInfo
- Publication number
- US956498A US956498A US48269709A US1909482697A US956498A US 956498 A US956498 A US 956498A US 48269709 A US48269709 A US 48269709A US 1909482697 A US1909482697 A US 1909482697A US 956498 A US956498 A US 956498A
- Authority
- US
- United States
- Prior art keywords
- fuse
- case
- plugs
- electric safety
- explosion
- 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 16
- 238000004880 explosion Methods 0.000 description 6
- 230000035939 shock Effects 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 2
- 239000011507 gypsum plaster Substances 0.000 description 2
- 229920001800 Shellac Polymers 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- ZLGIYFNHBLSMPS-ATJNOEHPSA-N shellac Chemical compound OCCCCCC(O)C(O)CCCCCCCC(O)=O.C1C23[C@H](C(O)=O)CCC2[C@](C)(CO)[C@@H]1C(C(O)=O)=C[C@@H]3O ZLGIYFNHBLSMPS-ATJNOEHPSA-N 0.000 description 1
- 229940113147 shellac Drugs 0.000 description 1
- 235000013874 shellac Nutrition 0.000 description 1
- 239000004208 shellac Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- H01H85/43—Means for exhausting or absorbing gases liberated by fusing arc, or for ventilating excess pressure generated by heating
Definitions
- anelectric' safet fuse comprising a tubular case integrally ormed of porcelain or other fictile material, a fuse strip therein, and a filling of non-combustible material completely occupying the space-within the case and protectinglsaid case from the effects of explosion of -t e fuse, by mechanically dampenin the shock of said explosion.
- blowing of the fuse strip instantly converts said moisture into steam, with the result that the case may become ruptured, by the sudden pressure, even when competent to resist the shock of fuse explosion if the filling material be dry.
- My invention has forits object to remove this difficulty, and consists in the construction hereinafter set forth, whereby the.ends' of the fuse case are closed by plugs of noncombustible material introduced in a plastic state and becoming hard by setting and simultaneouslyslightly expanding in volume, thus forming a perfectly close joint, the said plugs being also rendered impervious by coating their exposed faces with a material impervious to moisture.
- Figurel is a longitudinal section ofi'ny eleotrlc fuse, and Fi 2 is an end view.
- A is the tubular'case integrall formed of fictile material, preferably poroe ain.
- B is the fuse strip which extends through the case and is embedded in-any non-com bustible comminutecl material C, such as plaster, which material completely fills the. case and operates to protect the case from rupture on the blowing of the fuse by dampening the shock of the explosion.
- C non-com bustible comminutecl material
- plugs D of, preferably, plaster of paris tempered with water to the plastic state, or any other plastic material which is non-combustible and which hardens by setting.
- I prefer plaster of paris because in settin it expands somewhat in volume and thus forms a tight joint with the case.
- Said plugs are rendered moisture proof by coating their exterior faces, after setting, with a layer E of shellac or other materlal impervious to moisture.
- a safety fuse a tubular case integrally formed of fictile material, end plugs of non-combustible material in saidoase introduced in plastic state and hardened in place by setting, a fuse strip extending between and through said plugs, and a body of non-combustible material completely fillin the remaining space within said case and constructed to dampen or retard the vibrations due to sudden shock of explosion, and thereby prevent rupture of said case.
- a tubular case integrally formed of fictile material end plugs of non-combustible material in said case introduced in plastic state and hardened in place by setting, a moisture proof coating on the exposed faces of said plugs, a fusestrip extending between and through said plugs, and a body of non-combustible material completely filling the remainin space within said case and constructed to dampen or retard the vibrations due to sudden shock of explosion, and thereby prevent rupture of said case.
Landscapes
- Fuses (AREA)
- Cable Accessories (AREA)
Description
T. E.v MURRAY. ELECTRIC SAFETY. FUSE. 'nrmouxon nun 11.13.11. 1900.
Patented Apr. 26, 1910.
. ituemc'o:
THOMAS ,E. MURRAY, or NEW YORK, n. Y.
ELECTRIC SAFETY-FUSE.
Specification of Letters Patent.
Patented Apr. 26, 1910.
Application filed March 11, 1909. Serial No. 482,697.
- T 0 all whom it may concern:
claimed anelectric' safet fuse comprising a tubular case integrally ormed of porcelain or other fictile material, a fuse strip therein, and a filling of non-combustible material completely occupying the space-within the case and protectinglsaid case from the effects of explosion of -t e fuse, by mechanically dampenin the shock of said explosion. I have foun that where the ends of the case are closed by metallic caps or the like forming joints with the case, under certain conditions, moisture may enter said case through said joints and be retained by the commi- I nuted filling material. In such event, the
blowing of the fuse strip instantly converts said moisture into steam, with the result that the case may become ruptured, by the sudden pressure, even when competent to resist the shock of fuse explosion if the filling material be dry.
My invention has forits object to remove this difficulty, and consists in the construction hereinafter set forth, whereby the.ends' of the fuse case are closed by plugs of noncombustible material introduced in a plastic state and becoming hard by setting and simultaneouslyslightly expanding in volume, thus forming a perfectly close joint, the said plugs being also rendered impervious by coating their exposed faces with a material impervious to moisture.
1n the accompanying drawings Figurel is a longitudinal section ofi'ny eleotrlc fuse, and Fi 2 is an end view.
Simi ar letters of reference indicate like parts. I I
A is the tubular'case integrall formed of fictile material, preferably poroe ain.
B is the fuse strip which extends through the case and is embedded in-any non-com bustible comminutecl material C, such as plaster, which material completely fills the. case and operates to protect the case from rupture on the blowing of the fuse by dampening the shock of the explosion. In the ends of the case I insert plugs D of, preferably, plaster of paris tempered with water to the plastic state, or any other plastic material which is non-combustible and which hardens by setting. I prefer plaster of paris because in settin it expands somewhat in volume and thus forms a tight joint with the case. Said plugs are rendered moisture proof by coating their exterior faces, after setting, with a layer E of shellac or other materlal impervious to moisture.
I claim:
1.'In a safety fuse, a tubular case integrally formed of fictile material, end plugs of non-combustible material in saidoase introduced in plastic state and hardened in place by setting, a fuse strip extending between and through said plugs, and a body of non-combustible material completely fillin the remaining space within said case and constructed to dampen or retard the vibrations due to sudden shock of explosion, and thereby prevent rupture of said case.
2. In a safety fuse, a tubular case integrally formed of fictile material, end plugs of non-combustible material in said case introduced in plastic state and hardened in place by setting, a moisture proof coating on the exposed faces of said plugs, a fusestrip extending between and through said plugs, and a body of non-combustible material completely filling the remainin space within said case and constructed to dampen or retard the vibrations due to sudden shock of explosion, and thereby prevent rupture of said case.
In testimony whereof I have afiixed my signature in presence of two witnesses.
THOMAS E. MURRAY.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US48269709A US956498A (en) | 1909-03-11 | 1909-03-11 | Electric safety-fuse. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US48269709A US956498A (en) | 1909-03-11 | 1909-03-11 | Electric safety-fuse. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US956498A true US956498A (en) | 1910-04-26 |
Family
ID=3024901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US48269709A Expired - Lifetime US956498A (en) | 1909-03-11 | 1909-03-11 | Electric safety-fuse. |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US956498A (en) |
-
1909
- 1909-03-11 US US48269709A patent/US956498A/en not_active Expired - Lifetime
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