CA1257138A - Delay starters - Google Patents
Delay startersInfo
- Publication number
- CA1257138A CA1257138A CA000503255A CA503255A CA1257138A CA 1257138 A CA1257138 A CA 1257138A CA 000503255 A CA000503255 A CA 000503255A CA 503255 A CA503255 A CA 503255A CA 1257138 A CA1257138 A CA 1257138A
- Authority
- CA
- Canada
- Prior art keywords
- cylindrical member
- tube
- combustible material
- highly combustible
- delay
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Finger-Pressure Massage (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A delay starter device, which includes an elongated cylindrical member; a slow combustible material provided in the cylindrical member; and a highly combustible material provided at at least one position in or on the cylindrical member and being adapted to be placed in contact with a fuse cord. The highly combustible material is adapted to be ignited by the slow combustible material and in turn is adapted to ignite a fuse cord when in contact with it.
A delay starter device, which includes an elongated cylindrical member; a slow combustible material provided in the cylindrical member; and a highly combustible material provided at at least one position in or on the cylindrical member and being adapted to be placed in contact with a fuse cord. The highly combustible material is adapted to be ignited by the slow combustible material and in turn is adapted to ignite a fuse cord when in contact with it.
Description
3~3 FIELD OF INV~:NTION
The present invention relates to delay starters.
B~CKGROUND TO INVENTION
Delay starters are used in explosive ignition systems, in particular in ~mining operations.
Often human lifes may be endangered if an explosive charge is ignited too early, too late or even not at all. It therefore is important that such delay starters operate accurately and effectively.
It is an object of the invention -to suggest an imporved type of delay starter.
SUMMARY OF IN~ENTlON
According to the invention, a delay starter device includes an elongated cylindrical member of a non-explosvie material; a slow combustible non-explosive material provided within the cylindrical member; and a hollow tube of highly combustible ~0 non-explosive material provided in at least one position in the cylindrical member, for receiving a fuse inserted thereinto, such that said combustible material can be ignited by the slow combustible material and can in turn ignite a fuse when in contact with the fuse.
The highly combustible material may be provided at one end of the cylindrical member.
_ 3_ ~ 3L3~3 The tube of the highly combustible material may extend transversely through the elongated cylindrical member.
The tube may be made of highly combustible material comprising a hard wax mixture.
The tube may be made of highly combustible material comprising a mixture of potassium permanganate and wax.
BRIEF DESCRIPTION OF DRAWINGS
The invention will now be described by way of example with reference to the accompanying schematic drawings.
In the drawings there is shown in FIG. l a side view of a delay starter device in accordance with the invention;
, .~
_ 4 ~ 3~
Figure 2 an end view of the device seen along arrow II
in Figure l;
Figure 3 a side view of the highly combustible member used in the delay starter device in accordance with the invention; and Figure 4 an end view seen along arrow IV in Figure 1.
DETAILED DESCRIPTION OF DRAWINGS
Referring to Figures 1 and 2, the delay starter 10 is in the form of a stick or cylindrical member having an outer tubular sleeve 12 (eg. made of paper and thus being non-explosive) which is Eilled inside with slowly combustible material 14 (such as cotton wool and thus being non-explosive).
At one end 16 of the sleeve 12 a highly combustible member in the form of a tube 18 is provided. This tube 18 has a central hole 20 into which an ignitor cord can be inserted.
In use the delay starter is ignited at the end 22/
which is opposite to the end 16. The starter then smoulders slowly until it reaches the member 18. The member 18 thereupon ignites rapidly and causes ignition of the ignitor cord inside it. The igniter cord thereafter burns up to the explosives for ignition and explosion thereof.
Referring to Figures 3 and 4 a tube 24 is shown which comprises individual pieces 18 which are separable by breaking off at weakened zones 26. The pieces 18 are broken off and are inserted into the delay starter ~'.
_ 5 _ 1~13~
device 10 as may be required. The tube 24 is made of : a hard wax mixture containing potassium permanganate material, a non-explosive material.
I
, .
The present invention relates to delay starters.
B~CKGROUND TO INVENTION
Delay starters are used in explosive ignition systems, in particular in ~mining operations.
Often human lifes may be endangered if an explosive charge is ignited too early, too late or even not at all. It therefore is important that such delay starters operate accurately and effectively.
It is an object of the invention -to suggest an imporved type of delay starter.
SUMMARY OF IN~ENTlON
According to the invention, a delay starter device includes an elongated cylindrical member of a non-explosvie material; a slow combustible non-explosive material provided within the cylindrical member; and a hollow tube of highly combustible ~0 non-explosive material provided in at least one position in the cylindrical member, for receiving a fuse inserted thereinto, such that said combustible material can be ignited by the slow combustible material and can in turn ignite a fuse when in contact with the fuse.
The highly combustible material may be provided at one end of the cylindrical member.
_ 3_ ~ 3L3~3 The tube of the highly combustible material may extend transversely through the elongated cylindrical member.
The tube may be made of highly combustible material comprising a hard wax mixture.
The tube may be made of highly combustible material comprising a mixture of potassium permanganate and wax.
BRIEF DESCRIPTION OF DRAWINGS
The invention will now be described by way of example with reference to the accompanying schematic drawings.
In the drawings there is shown in FIG. l a side view of a delay starter device in accordance with the invention;
, .~
_ 4 ~ 3~
Figure 2 an end view of the device seen along arrow II
in Figure l;
Figure 3 a side view of the highly combustible member used in the delay starter device in accordance with the invention; and Figure 4 an end view seen along arrow IV in Figure 1.
DETAILED DESCRIPTION OF DRAWINGS
Referring to Figures 1 and 2, the delay starter 10 is in the form of a stick or cylindrical member having an outer tubular sleeve 12 (eg. made of paper and thus being non-explosive) which is Eilled inside with slowly combustible material 14 (such as cotton wool and thus being non-explosive).
At one end 16 of the sleeve 12 a highly combustible member in the form of a tube 18 is provided. This tube 18 has a central hole 20 into which an ignitor cord can be inserted.
In use the delay starter is ignited at the end 22/
which is opposite to the end 16. The starter then smoulders slowly until it reaches the member 18. The member 18 thereupon ignites rapidly and causes ignition of the ignitor cord inside it. The igniter cord thereafter burns up to the explosives for ignition and explosion thereof.
Referring to Figures 3 and 4 a tube 24 is shown which comprises individual pieces 18 which are separable by breaking off at weakened zones 26. The pieces 18 are broken off and are inserted into the delay starter ~'.
_ 5 _ 1~13~
device 10 as may be required. The tube 24 is made of : a hard wax mixture containing potassium permanganate material, a non-explosive material.
I
, .
Claims (5)
1. A delay starter device, said device comprising an elongated cylindrical member of non-explosive material; a slow combustible non-explosive material provided in the cylindrical member; and a hollow tube of highly combustible non-explosive material provided in at least one position in the cylindrical member and being adapted to receive a fuse cord inserted thereinto, for igniting by the slow combustible material and for, in turn, providing ignition of a fuse cord when in contact therewith.
2. A device as claimed in claim l, in which the tube of highly combustible material is provided at one end of the cylindrical member.
3. A device as claimed in claim 1, in which the tube of highly combustible material extends substantially transversely through the elongated cylindrical member.
4. A device as claimed in claim 1, in which the tube is made of highly combustible material comprising a hard wax mixture.
5. A device as claimed in claim 1, in which the tube is made of highly combustible material comprising a mixture of potassium permanganate and wax.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000503255A CA1257138A (en) | 1986-03-04 | 1986-03-04 | Delay starters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000503255A CA1257138A (en) | 1986-03-04 | 1986-03-04 | Delay starters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1257138A true CA1257138A (en) | 1989-07-11 |
Family
ID=4132600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000503255A Expired CA1257138A (en) | 1986-03-04 | 1986-03-04 | Delay starters |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1257138A (en) |
-
1986
- 1986-03-04 CA CA000503255A patent/CA1257138A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |