US1735099A

US1735099A - Device for extinguishing the flame of blasting charges

Info

Publication number: US1735099A
Application number: US216700A
Authority: US
Inventors: Witte Martin
Original assignee: Individual
Current assignee: Individual
Priority date: 1925-06-13
Filing date: 1927-08-31
Publication date: 1929-11-12
Anticipated expiration: 1946-11-12

Description

Nov. 12, 1929. M. WITTE 1,735,099

DEVICE FOR EXTINGUISHING THE FLAME OF BLASTING CHARGES Filed Aug. 31, 1921 [22 zrenioz':

Attorney- Patented Nov. 12, 1929 UNITED STATES MARTIN WITTE, or BRESLAU, GERMANY DEVICE FOR EXTINGUISHIIJG THE FLAME OF BLASTING CHARGES Application filed August 31, 1927, Serial No. 216,700, and in. Germany June 13, 1925.

This invention relates to devices for extingulshing the flame of blasting charges.

Devices of this kind are known in which the ignition of the blasting charge is positively dependent upon the ejection of water from nozzles into the gallery or against the stope or the like which is being acted upon. The

nozzles are supplied from a spraying pipe The object of the present invention is to render the quantity of water which flows from the nozzles or pipes during the explosion entirely independent oi the small cross section of the spraying pipe and to eject such considerable quantities of water in a unit of time that not only the flame from the explosion will be extinguished, but the dust which is disturbed by the explosion and the smoke oi the explosion gases are precipitated.

For this purpose there is interposed between the spraying pipe of narrow cross sec tion and the water outlet, which has a correspondingly large cross section, and an intermediate member in the form of an air chamber serving as a water storing device. The air chamber has the lower part thereof gradually filled with water from the spraying pipe, whilst compressed air is contained in the upper portion thereof. When the explosion takes place the air chamber is rapidly emptied through an outflow pipe of large cross-section and leading from the bottom thereof by reason of the sudden relez so oi? a closure of the outflow pipe, and the water is suddenly projected towards the mouth of the blast charge. By the release of the closure of the outflow pipe a contact is actuated which closes an electric circuit in which is included the electric ignition of the charge. In this manner the explosion and the discharge of the mass of water into the gallery and against the mouth of the bore hole are rendered simultaneously.

A piston or a cover may serve as the closure for the outflow pipe, the piston or cover being held closed by a locking member which is forced open when a predetermined maximum pressure is reached in theair chamber.

A form oi constructionof the invention is illustrated in the accompanying drawing, of which Fig. l is a diagrammatic sectional view showing the device in position, and Fig. 2 is a vertical cross-section through the air chamber on an enlarged scale.

The container [4 may be connected by a tubulure h and a hose 7' either witha Water spraying supply .9 or a compressed air sup- Pyt.

To the closed container a is connected the outflow pipe .7). This is closed by a piston a which is carried by a rod 6, c anchored at (l. The weakest point of the rod is formed by an intermediate member f of predeterminedtensile strength and which is connected rigidly to the two portions of the rod.

WVhen the device is in use theaxis of the outflow pipe 5 is directed towards the mouth of the blast hole 9 and the lower portion of the container a and the outflow pipe are filled with water, the air being allowed to escape from the pipe through the valve g. Compressed air is now passed into the container a through the pipe h. WVhen the compressed air above the water level has reached the required pressure the intermediate member f is fractured, the piston 0 is forced out and a stream of water under pressure and of large cross section is directed against the mouth of the blast hole 9. When the piston 0 is ejected from the pipe the strap i is rocked on the pivot 70 and the lever Z rigidly connected to the strap 11 is pressed against the contact m. The contact then closes a circuit through the wires 72, a connected to the electric ignition for the charge in the bore hole g. In order to prevent the piston c from being projected against the mouth of the blast hole g it is connected by means of the ring 0 and a rope or chain 19 to amine post or the like.

In view of the varied position of the blast holes the device may be secured with the outflowpipe at a suitable height and directed in a suitable direction on a stay beam. Then it is preferred to allow the stream of water to flow towards the mouth of the blast hole in a distributed manner instead of in a closed stream, such a distribution can be obtained by the use of inclined guide blades which are mounted in the outflow pipe 6.

1. In a device for extinguishing the flame of blast charges and for precipitating the disturbed dust and the smoke of the explosion gases wherein the ignition is efiected when a water discharging device is brought into operation, an air chamber situated in "front of the blast charge, means for alternately connecting the said air chamber with a water spraying supply and an air compressor, a tubulure of relatively large cross-section extending from the bottom of the air chamber and being directed towards the mouth of the blast charge, :an appliance closing the said tubulure, means for suddenly opening the closure :and thereby emptying the said chamber and ejecting the water onto the blast charge, and :means tor simultaneously igniting the blast charge.

2. In a device for extinguishing the flame of blast charges and for precipitating the disturbed dust and the smoke of the explosion gases wherein the ignition is efiected when a water discharging device is broughtinto operation, an ai-r-chambersituated in front of :the blast charge, means for alternately connect-ingithesaid airchamber with .a water spraying supply and an air compressor, a tubulure of-relatively large cross-section extending from the bottom of'the air chamber and being directed towards the mouth of the blast charge, 79.11 appliance closing the said :tubulu-re, Ea frangible .member holding the -.closure and adapted to be tracturedwhen a predetermined pressure-is reached in the air chamber, :and means for simultaneously igniting the blast charge.

3. .111 a device torextinguishing the name of blast charges and for precipitating the disturbeddustand thezsrnoke of the explosion gases wherein 'theignition is eiiected when a water discharging device is brought into operation, :an air chamber situated in front of the blast charge, means ior alternatey connectingthe said-air chamber with a water spraying supply and an air compressor, a tubulure of relatively large cross-section extending from the bottom of the air chamber and beingdirected towards the mouth-of the blast eharge,acover closingthesaid tubulure, means for suddenly releasing. the said cover and thereby -.e1npty-ing the said chamber and ejecting the water onto the blast charge, and means forsimu'ltaneously igniting the-blast charge. 1

A. In a device forextinguishing the flame of blast charges and for precipitating the disturbed ClLlStsZtllEl-thSIDOkS'OfthQ explosion gases wherein-the ignition is effected when a water discharging device is brought into operation, an air chamber situated in front MARTIN WITTE.