US1642118A

US1642118A - Blasting-bore closure

Info

Publication number: US1642118A
Application number: US148981A
Authority: US
Inventors: Lindner Werner
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-07-26
Filing date: 1926-11-17
Publication date: 1927-09-13
Anticipated expiration: 1944-09-13
Also published as: GB265518A

Description

1,642,118 S p 13, 1927' w. LINDNER BLASTING BORE CLOSURE Filed Nov. 17. 1926 Jnvemor:

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Patented Sept. 13, 1927.

PATENT OFFICE.

WERNER LINDNER, OF BEUTHEN, GERMANY.

BLASTING-BORE CLOSURE.

Application filed November 17, 1926, Serial No. 148,981, and in Germany July 26, 1926.

This invention relates to improvements in blasting closures. Said closure is Preferably used in combination with a water filling of one part of the blasting bore and comprises a plug proper having a longitudinal bore and means to operate like a non-return valve. Said closure bringing about a saving in blasting material and affording perfect safety while the blasting work is carried out. The blasting bore is, to that effect, filled in the manner shown in the accompanying drawing, in which also the blasting bore plug is illustrated diagrammatically and by way of example. Figure 1 is a longitudinal section through a filled blasting bore ready for use, Figure 2 is partl a side view of, and partly an axial section t rough a blasting bore plug designed according to this invention, this figure being drawn to a considerably increased scale relatively to Figure 1, and Figure 3 is an end-view of said plug.

On the drawing, 1 (Fig. 1) denotes the finished blasting bore, 2 the blasting substance introduced into its rear ortion, 3 the fuze for this substance, 4 a uze cord, and 5 a stopppr consisting of loam and preventing the lasting substance 2 from leaving its place, as well as from gettin moist. The free end of the blasting bore is closed by a plug which is preferably conical and consists of wood or another suitable material. The details of this plug are shown in Figs. 2 and 3. The blasting bore end is preferably so much enlarged that the plug g can be provided with a packin 11 of plastic loam for tightening it in the lasting bore end. The plug 6 is provided with an axial channel 7 through which water can be, and is, introduced, may "be by means of an ordinary syringe, into the blasting bore space 1 between the stopper 5 and the plug 6 until this space ls comp etely filled. The water will be retained in said space in most cases ahead by the ressure of the atmospheric air; only if gas nds access into the blasting bore the water will be forced out of it, or of the s ace or chamber 1 respectively. In view oft is possibility or from reasons of safety generally,

a piece of rubber film 8 is drawn over the inner face of the plug 6, as well as over the rear end of the plug channel 7 and is secured in lace by a cord 9 wound round in a perip eral groove 10, as shown especially in Fig. 2. This simple elastic closing member (8) permits the introduction of the water into the chamber 1, but prevents the water from leaving said chamber in that it acts as a non-return valve. Of course also another type of non-return value could be used.

When the blasting bore 1 has been filled and prepared in the manner stated, and the blasting substance 2 is exploded, a very strong pressure is suddenly exerted upon the water which not only has a great inertia but also cannot be compressed, the result bein that the action of the blasting substance is greatly intensified by that water pressure in that it presses upon the blasting bore wall and rends the mineral. On the other side, however, the water forms a particularly effective protection from the dangerous explosion of hydrocarbons as well as from coal dust, because it extinguishes at once the explosion flame.

I claim:

'1. A plug for closing the open end of a blasting bore, comprising, in combination, a plug proper having a longitudinal bore, and means rovided at the inner face of this plug and a apted to operate like a non-return valve, for the urpose set forth.

2. A plug or closing the open end of a blasting bore, comprising, in combination, a plug proper having a lon itudinal bore, and a non-return valve provi ed at the inner end of said bore, for the purpose set forth.

3. A plug for closing the open end of a blasting bore, comprising, in combination, a plug roper havin a lon 'tudinal bore, and a rub r film attac ed to t e rear end of said plug and covering the rear end of said bore and being adapted to operate as a non-return valve for the said bore, substantially and for the purpose set forth.

In testimony whereof I aflix mirggpature.

WERNER LI ER.