US2178723A - Detonator - Google Patents

Description

Nov. 7, 1939. P, MCG, FORSYTH 2,178,723

DETONATOR Filed March 29, 19

.Patented Nov. 7, 1939 srArl-:s

. murA nnroNA'roR Peter McGill Forsyth, Raetihi, New Zealand Application March 29, 1937, Serial No. 133,673

In Greatritaln November 3, 1936 lclaim.

:This invention relates to detonators and the lijke of the kind wherein an exposive material is held in a container and an igniting means is passed into the latter and adjacent the said material, the

i ignition and explosion of the latter thereafter bringing about the ring of a main charge of explosive material.

, The objects of this invention are to provide improvements in detonators and the like made y@ hitherto so that the latter will have increased eiliciency in and surety of `operation by excluding moisture and dampness from the interior of the detonator and the like so that the explosive materlal therein is not harmed or destroyed, and by i preventing the easy and undesirable turning of the limiting means while adjacent the explosive material therein so that the latter avoids premature ignition. In this latter respect the objects include preventing' the igniting means from becoming more than merely adjacent the explosive materiai so as to mize the danger of early tion particuiarly during the insertion'and adjustment of the igniting means in the detonator and the like.

According to this invention the improved detonator comprises a container having an outer shell preferably of cylindrical formation with an open end, the lip of the latter being rolled over to secure a resilient bodyin the open end, and aholed divid- 3@ ing wall in the container so that said resilient body normally closes said `end 'but is capable of distension to allow an igniting means to be passed into the container as far as the said dividing wall.

. The invention will now be further described with reference to the accompanying drawing in which:-

e i is an elevational view of the outside of the container made in accordance with this invention,

4o 2 is a sectional elevation of Figure 1 showingl one form oi the resilient body, and one form oi the dividing wall,

.Figure 3 is a sectional elevation of Figure 1 sho another form of the resilient body and another form or the dividing wall together with a fuse in position, f

Figure 4 is a sectional elevation of Figure 1 showing a further alternative form of the dividing wall together with a fuse in position.

Figure 5 is a cross section on line A-A of Figure 2, while,

Figure 6 is a cross section on line B-B of Figure 2.

Referring to the drawing, a container l follows 55 generally a cylindrical outline and has a closed bottom 2 to hold explosive material 8, and further the container may have a bulbous portion 4 in the upper part of the container l, and may have a rolled over and helically` shaped lip 5 for securing a resilient body 6 as hereinafter explained.

Situated in or near the upper part of the container l is a resilient body 6 which normally closes the entrance to the container l but gives access to the latter upon distension of the resilient body 6 such as by the insertion oi a fuse 3, see Figure 3. l@

Such resilient body t preferably overiiows or extends over the lip 5 and the latter is then pressed intightly and closely against the resilient body 6 to make a damp-proof seal between the container and the resilient body 6. The resilient 355 body t may have a bell shaped mouth 1 and a bell shaped inner entrance la, either extending beyond the bulbous portion d or terminating Within the latter as illustrated by Figures 2 and 3 respectively of the accompanying drawing, but so that the inzo sertion, and if necessary, the extraction of a fuse or electric connection for igniting explosive material t, can be accomplished readily and easily.

The container l is made with a dividing wall 9 which may be part of the wall of the container i g5 indented and pressed in until an aperture lli remains for communication to the explosive material t; but so that the fuse 3 or an electrical connection passed through the resilient body 6 bears upon the dividing wall d and is adjacent the ex- 30 plosive material 8 thereby to diminish the possibility of premature explosion by chaflng the said material 8; but to allow a ame or spark from the fuse or the electrical connection to pass therethrough. As illustrated in Figure 3 the dividing e5 wall 9 may be sloped inwards and downwards towards the aperture lo in the formation of a funnel; while as illustrated in Figure 4, the dividing wall 9 may be sloped inwards and upwards towards the aperture l0 in the form of a trun- 40 cated pyramid, and in each form of dividing wall 9 the explosive material 8 is behind but up to the level of the aperture i0. The indented or pressed in wall 5 may be situated at any desired position between the closed bottom 2 of the container I 45 and the inner end of the resilient body to allow for a required amount of explosive material. Further, the indented or pressed in wall 9 which is double skinned as the result of indenting or pressing in the wall of the container l, may have the 50 double skins joined together such as by soldering or welding to add strength to the said dividing wall 9 and prevent movement of the latter.

A detonator constructed and arranged as herein described and illustrated in accordance with this invention is designed to hold the resilient body I so that moisture and dampness is excluded from the container l and the fuse or electric connection is held against undesired turning after the same has been placed in the desired relationship adjacent the explosive material l near the aperture i0 and against the dividing wall I.

What I do claim and desire tu obtain by Letters Patent of the United States oi' America is:

In a detonator. a container having a bulbous portion adjacent the open end thereof, a resilient body arranged in the bulbous portion restricting the entrance to the container, the open end of said container having a rolled over and helically shaped lip. a portion of the resilient body secured in the lip oi the container to provide a seal between the container and the resilient body.

PETER McGlLL FORSYTH.

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