US1390849A - Method of loading detonating-caps - Google Patents

Description

T'. WENNERSTHM.

METHOD 0F vLOADING DHTONATING CAPS.

APPLICATION FILED APH. 15| 1919-;

Patented Sept.` 13, 1921.

Inwn'wz: l

PMENTl OFFICE.

TORSTEN WENNERSTRM, 0F BOFORS,

METHOD OF LOADING DETONATING-CAPS.

Specication olf Letters Patent.

Application led April 15, 19'19.- Serial No. 250,319.

To all whom it may concern:

Be it known that I, ToRs'rnN WENNER- sTRM, a subject of the King of Sweden, residing at Bofors, Sweden, have invented new and useful Improvements in Methods of Loading Detonating-Caps, of which the following 1s a specification.

Detonating caps for dynamite hitherto usually have been loaded in such a manner that the detonating. composition after the introduction in the cap is submitted to pressure by means of a pressing die introduced in the mouth of the cap. When such a loading of 'caps with a main loading or trotyle (trinitro-toluol) or the like and an initial or primary loading of fulminatirg mercury or the like has taken place hitherto at least three pressing operationshave been required viz. one fbr the compression of the main loading, one for the compression of the initial loading in its preserving cap and one for the introduction of the cap last mentioned in the outer or detonating cap, filled with the main loading. Hereby the main loading evidently will obtain the least degree of compression at the bottom of the outer cap and the largest one' at'the cap, in-

` closing the primary loading, whereby the variation of its density becomes the most unsuitable one for the releasing and the course of the detonating process.

My invention has for its object to avoid this inconvenience by providing a method whereby the pressing operation is carried out from the bottom of the detonating cap (which for this purpose is open in both endsV as already known), in such a manner that, after the'introduction ofthe empty cap for the initial loading on its place in the outer cap through the said bottom, this initial loading cap is loaded with the initial loading, whereupon the main loading is introduced in the outer cap and the whole' o .pressing operation is diminished to a minicontents of the two caps finally is submitted to pressure from the bottom end. The pressure hereby `is applied directly upon the non-sensitive main loading and'not as heretofore upon the sensitive '.itial loading. In the loading of larger dynamite detonating caps a subsequent filling with main loading and a further compression in some` cases is necessary.

In the accompanying drawing the herein described method of loading is illustrated,

in which drawing,

Figures 1 to 3 are vertical longitudinal sections of a portion of a loading frame illustrating theca before the filling, after the filling, and agter the pressing respectively.

Fig. 4 is a rlongitudinal section of the filledl detonating cap.

In Fig. 1 is shown an empty cap 1 open at both ends, and inserted in the loading frame a, of which only the parts adjacent to the cap are shown. The frame is provided with a removable bottom o having upstanding pins b which project through channels formed in the frame a. A cap 2 for receiving the initial loading is inserted in the cap 1 as shown in Fig. 1. In Fig. 2 the cap is illustrated as having received the initial loading 4, and the main loading 3, in the initial loading cap 2, the outer cap l, respectively, while Fig. 3 illustrates the osition of theseloadings after pressure rom the bottom end of the cap 1.l Fig. 4, as hereinbefore stated, illustrates the cap after it has been loaded and pressed and removed from the loading frame.

By the method now described the following advantages are obtained:

1. The detonating cap is loaded by only one pressing operation 1n place of by three such ones.

2. `The main loading obtains its least density near to the initial loading and its largest density at ,the opposite end of the outer cap, which as above mentioned is of a great importance for an advantageous releasing and course of the detonation.

3. The primary cap can obtain a greater length than heretofore, so that its mouth eX- tends longer in the main loading than heretofore, whereby it gets a better hold, so that a good detonation is obtained and accidents are obviated.-

4. The danger of an explosion during the mum, as the pressure is applied to the nonsensitive main loading and the cap inclosing thesensitive initial loading cannot be displaced during the pressing operation, because it has been inserted on its place already before its filling with the initial loading and the pressing operation. l 5. There is no risk of stickingv of dust from the sensitive initial loading upon the inside of the outer'I cap or the pressing means.

Patented Sept. 13, 1921.

Havin now @rticularly described the nature o my invention andthe manner of its operation, what I claim is:

1. An improved method of loading detonating caps open at both ends thereof, which consists in inserting a cap Within said open-ended cap, introducing an initial loading into said inner cap, introducing into the open-ended'cap a main loading through its open' bottom and subjecting the Whole contents of the two caps to pressure in a single operation.

2. An improved method ofloading detonating caps open at both ends thereof, which consists 1 in insertin a cap within said open-ended cap, intro ucing an initial loading into said inner cap,'ntroducing into the open-ended cap a main-loading through its open bottom, subjecting the whole c ontents of the vtWo caps to pressure in a single operation, introducing-again a main loading through the open bottom and finally subjecting the contents again to pressure.

In 'testimony whereof I have signed my name to this speciication.

TORSTEN WENNERSTRM.

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