US2095574A

US2095574A - Mining fuse

Info

Publication number: US2095574A
Application number: US77878A
Authority: US
Inventors: Roumazeilles Maurice; Harle Roger
Original assignee: Harle Freres & Co Sarl Soc
Current assignee: Dite Harle Freres & Co S A R L Ste; Harle Freres & Co Sarl Soc
Priority date: 1935-05-10
Filing date: 1936-05-04
Publication date: 1937-10-12
Anticipated expiration: 1954-10-12
Also published as: GB457590A; FR802021A

Description

tars earns is MINING FUSE Maurice Roumazeilles, Joinville le Font, and Roger Harl, Pitres, France, assignors to Societe dite Harle Freres & Co, S. A. R. L, Pitres (Euro), France No Drawing. Application May 4, 1936, Serial No. 77,878. In France May 10, 1935 9 Claims. (Cl. 1028) The present invention relates to mining fuses pie, tricresyland triphenylphosphates with or and especially mining fuses for firing liquid without the admixture of a filler such as, preferoxygen cartridges. ably, lamp black. In order to prevent the fuse The fuses that are employed at the present from adhering while being wound about itself,

im for firin iq i xy n car rid es have th it may be covered with a layer of powdered mica, 5 drawback that they. do not prevent the formation which is preferably applied immediately after of external sparks which, in the presence of the being coated and while the coating is still in a oXygen Stream. considerably elera e e r wet state. The mixture thus formed is perfectly of combustion and therefore endanger t e li stable and neutral at temperatures below 150 C.,

10 Of the person that 13 making use Of them. and it is especially suited for application upon 10 It has been endeavoured to obv ate t s draW- the fuse at lower temperatures more compatible ba k by imp at n t s 5 With saline with the prevention of deterioration of the solutions, or, in a more g ne l an er, p e powder comprising the combustible core of the nating masses the decomposition of which, under fu e (belcw 105 Ancther important prop- 15 the efiect of the heat resulting from the ccmbust f t 1 coating is t t it may be aption of the black powder core and from the explied in ery thin layers to the fuse at these ternal sparks, produces either the formation of a preferred temperatures. protective and extinguishing gaseous layer or the wh brgught t temperatures above 150 C, vitrification of the impregnating s, giving the by the heat given ofi by the combustion of the 20 same result. fuse, the mixture comprising the coating Will 20 It was also suggested to make fi eproof comp form a shell which normally is incombustible, sitions of matter, especially for the manufacture and, While melting 1 gradually Coat the f e Of insulating materials for use in Othel' branches as the norma co nbustion of the latter proceeds of t e instance TOT making electrical Thus, the coating provided in accordance with conductors. T e e COmDOSitiOHS cfinsist 0f the present invention possesses the following detur s f p u p d of defines of ru r and sirable properties. In the heated state, it is liqof fillers. They may so (301151813 0f the O OW- uid at the preferred temperatures of application,

ing matters: or otherwise the powder core would be deterio- Resins plastified by a tricresylp osphate; rated, and it is sufficiently liquid to coat an ordi- Gutta-percha mixed with rubber and resin; fuse with a very thin uniform shell t 30 Hydmcarbons mixed With rubber d a ho 0gvery rapid speed. In the cold state, the coating enous naphthalene; is adherent to the fuse base, flexible, and hard Rubber mixtures conta n aliphat c polyenough at normal temperatures to prevent stickmeric compounds having a high pe ce ta 0f ing to itself when wound, or to other substances chlorine and aromatic chlorinated hydrocarbons. with which it may come in contact. The cover- 35 But these compositions of matter do not ing is also very homogeneous, stable, imper possess the properties above stated necessary for able, and insoluble. making mining fuses more especially intended One specific example of the reduction of the for firing liquid oxygen cartridges. present invention to practice is as follows: 4500 The object of the present invention is to progr. of tetrachloronaphthalene are melted at a 40 vide a mining fuse which avoids all the drawtemperature of approximately 120, that is, somebacks above mentioned. what above its melting point; 400 gr. of tricresyl- To this effect, the present invention contemphosphate, such as ammonium tricresylphosplates the coating of a mining fuse having a phate, are then added; then there is added with combustible core of the usual type with a thin, constant stirring 600 gr. of chlorinated rubber; flexible and non-viscous coating or shell com-e and about 200 gr. of lamp black or any other posed of a chloronaphthalene, having a high suitable filling material may be added to the percentage of chlorine, with the admixture of mixture. When thoroughly mixed the product chlorinated rubber, this latter ingredient repremay be applied directly to the fuse base,--which senting less than 30% (preferably in the neighis preferably already tarred as in the usual case, 50

borhood of 12%) by weight of the mixture, and by immersion of the fuse in the vessel containacting as a plastifier for and at the same time ing the molten coating material. fireproofing the coating. It should also be noted that the mixture above If desired, additional plastifying substances indicated can be utilized in combination with may be added to this mixture, such as for exampitches, tars, resins, plastic matter and the like. 55

In a general manner, while we have, in the above description, disclosed. what we deem to be an efficient embodiment of the present invention, it should be well understood that we do not wish to be limited thereto as there might be changes made therein Without departing from the principle of the present invention as comprehended within 'the scope of the appended claims.

What we claim is: 7

1. A safety fuse particularly adapted for use in connection with the firing of liquid oxygen cartridges in mining operations or the like, comprising a fuse having a combustible core and having a thin, flexible, non-viscous coating thereon composed of a mixture of tetrachloronaphthalene and chlorinated rubber, the latter ingredient not exceeding 30% by weight of the total mass of said mixture.

2. A safety fuse particularly adapted for use in connection with the firing of liquid oxygen cartridges in mining operations or the like, comprising a fuse having a combustible core and having a thin, flexible, non-viscous coating thereon composed of a mixture of tetrachloronaphthalene and chlorinated rubber, the latter ingredient cfomprising approximateiy 12% by Weight'of the'total mass of said mixture.

3. A safety fuseparticularly adapted for use in connection with the firing of liquid oxygen cartridges in mining operations or the like, comprising a fuse having a combustible core and having a thin, flexible, non-viscous coating ,7

thereon composed of a mixture of not under 70% by weight of tetrachloronaphthalene and not over 30% by weight of chlorinated rubber;

together with an additional plastifier consisting of one selected from the following grcup:- tricresylphosphates and triphenylphosphates.

4. A safety fuse particularly adapted for use in connection with the firing of liquid oxygen cartridges in mining operations or the like, com" prising a fuse having a combustible core and having a thin, flexible, non-viscous coating thereon composed of a mixture of not under 70% by Weight of tetrachloronaphthalene and not over 30% by weight of chlorinated rubber; together with an additional plastifier consisting of ammonium tricresylphosphate.

5. A safety fuseparticularly adapted for use in connection with the firing of liquid oxygen car tridges in mining operations or the like, comprising a fuse having a combustible core and having a thin, flexiblanon-viscous coating thereon composed of a mixture of not under 70% by weight of tetrachloronaphthalene and not over 30% by weight of chlorinated rubber; together with a having a thin,

filler and an additional plastifier consisting of one selected from the following group:-tricresylphosphates and triphenylphosphates.

' 6. A safety fuse particularly adapted for use in connection with the firing of liquid oxygen cartridges in mining operations or the like, comprising a fuse, having a combustible core and having a thin, flexible, non-viscous coating thereon composed of a mixture of not under 70% by weight of tetrachloronaphthalene and not over 30% by weight of chlorinated rubber; together with a filler consisting of lamp black and an additional plastifier consisting of one selected from the following group:-tricresylphosphates and triphenylphosphates.

7. A safety fuse particularly adapted for use in connection with the firing of liquid oxygen cartridges in mining operations or the like, comprising a fuse having a combustible core and having a thin, flexible, non-viscous coating thereon composed of a mixture of not under 70% by Weight of tetrachloronaphthalene and not over 30% by weight of chlorinated rubber; together with an additionalplastifler consisting of a tricresylphosphate; and an outer adhering layer of powdered mica.

8. A safety fuse particularly adapted for use in connection with the firing of liquid oxygen cartridges in mining operations or the like, comprising a fuse having a combustible core and flexible, non-viscous coating thereon composed of a mixture of the following ingredients in the proportions substantially as set forth:-

Parts Tetrachloronaphthalene h 45 Chlorinated rubber 6 Atricresylphosphate 4 A filler 2 Chlorinated rubber 6 Ammonium tric resylphosphate 4 Lamp black 2 ROUMAZEHJLEZS. ROGER HARLE.