US2773410A - Machine and method for the production of blasting detonators and improved blasting detonators - Google Patents

Machine and method for the production of blasting detonators and improved blasting detonators Download PDF

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Publication number
US2773410A
US2773410A US227574A US22757451A US2773410A US 2773410 A US2773410 A US 2773410A US 227574 A US227574 A US 227574A US 22757451 A US22757451 A US 22757451A US 2773410 A US2773410 A US 2773410A
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US
United States
Prior art keywords
die
detonator
detonators
casing
tube
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 - Lifetime
Application number
US227574A
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English (en)
Inventor
Philip C Bishop
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Application granted granted Critical
Publication of US2773410A publication Critical patent/US2773410A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/195—Manufacture
    • F42B3/198—Manufacture of electric initiator heads e.g., testing, machines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49925—Inward deformation of aperture or hollow body wall
    • Y10T29/49934—Inward deformation of aperture or hollow body wall by axially applying force

Definitions

  • the present invention relates to an improved method and machine for the production of blasting detonators of the kind wherein a portion of the wall of the ductile metal casing in the vicinity of the mouth is pressed against a closure member of a resiliently deformable nature inserted into the mouth of the casing, and to improved detonators made thereby.
  • the invention is applicable for instance to the manufacture of the so-called capped fuses which consist essentially of a plain detonator firmly attached to a length of safety fuse extending from the exterior through the mouth of the detonator casing so that one end of it is in close proximity to the detonator charge, and also to the production of electric detonators of the kind in which a portion of the detonator casing in the vicinity of the mouth is forced into contact with a resiliently deformable plug through which pass insulated conductors leading to an electric igniter positioned within the casing for ignition of the detonator charge.
  • the method for providing a detonator with a resilient closure member comprises necking the mouth portion of the detonator casing on to the closure member.
  • the closure member is of smaller diameter than the diameter of the mouth portion of the detonator casing before necking.
  • closure member passes through the mouth of the detonator and can be for example a length of safety fuse.
  • neck is to be understood a portion of a detonator 2,773,410 Patented Dec. 11, 1956 tube having a reduced diameter and at least approximately the original circular cross-section.
  • contour of the necked surface may be varied for instance by providing two or more necks connected by surfaces of gradually or progressively diminishing diameter towards the month end of the detonator.
  • a detonator according to the present invention therefore has a neck in the mouth portion of the detonator casing and a resilient closure member in said neck.
  • the resilient closure member passes through the mouth of the detonator casing as for example where the resilient closure member is a length of safety fuse.
  • Apparatus comprises a pusher in combination with a die formed from two portions which are adapted to be moved apart and to be brought together by movements having components at right angles to the path of said pusher and when apart to be sufliciently separated to allow a detonator to be inserted or withdrawn from its forward end and when together to leave a small axial opening at its forward end and to form at least one surface progressively converging forwardly, said pusher being positioned at the rearward end of said die.
  • the said two portions when together form a longitudinal channel commencing at the rearward end of the die.
  • One form of apparatus suitable for the production of detonators comprises longitudinally reciprocable portions which in their forward position form together an axially channelled exteriorly frustoconical die having at least one internal surface progressively converging forwardly and a small axial opening at its forward end and in their reaward position have a separation suificient to aliow a detonator to be inserted or withdrawn through the forward end, a fixed annular guide having a frusto-conical surface adapted to bring together said die portions moving forwardly within it to support said portions over the area of their frusto-conical surface when in the forward position, springs adapted to separate said die portions as they move backwards within said annular guide, an axially channelled stem attached to said die of suificient diameter to accommodate a detonator tube, and a reciprocating pusher.
  • the reciprocating pusher is timed with the motion of said stem so as to permit a detonator tube to fall into the channel of said stem when said stem and die portions are in retracted position and to push the detonator tube forward during the forward motion of said stem and die portions.
  • the stern of the die is slotted so that when said stem and the pusher are in retracted positionthe slot is in line with a supply of longitudinally orientated and superposed detonator tubes forwardly of the pusher.
  • the necked portion of the detonator should have two or more necks connected by surfaces of gradually or progressively forwardly converging contour they may either all be formed in a single operation by suitably contouring the forward portion of the channel of the die portions or the machine may incorporate a pin.
  • an assembly can be provided consisting of successive apparatus each having a die of larger diameter than the next one and means to enable detonators to be transferred from one said apparatus to its next one.
  • the apparatus of the invention may be set either horizontally or vertically, and where there is used a loose igniting charge instead of a matchhead would be set vertically so that the mouth of the detonator tube points upwards.
  • Fig. l is a longitudinal axial section in a vertical plane showing the die in its closed position with a necked detonator enclosed therein at the end of a working stroke.
  • Fig. 2 is a similar section showing the die in its open position with the pusher retracted and a detonator tube in front of the pusher and also an electric fuse assembly having its-leading wires passing through a resilient plug ready to be assembled with the detonator tube.
  • Fig. 3 is an end elevation as seen from the front of a portion of the apparatus illustratcd in Fig. 2 and Fig. 4 is a similar end elevation corresponding to Fig. 1.
  • Fig. l is a longitudinal axial section in a vertical plane showing the die in its closed position with a necked detonator enclosed therein at the end of a working stroke.
  • Fig. 2 is a similar section showing the die in its open position with the pusher retracted and a detonator tube in front of the pusher and
  • Fig. 6 is a detail showing the shape of a die having two tapering portions and Fig. 7 is a detail showing a finished electric detonator, these two figures being on a larger scale than Figs. l-5.
  • 1 is the body of the machine and 2 a flange thereon providing a base for the machine.
  • 3 are parallel arms formed integral with an annular guide 4 having a frusto-conical internal surface.
  • 5 is a horizontally split externally frusto-conical die the halves of which are semi-cylindrically axially channeled for the greater part of their length and at their forward portion are so contoured as to provide when the die is closed a channel of the desired shape for the necked detonator, terminating in a somewhat flaring mouth.
  • These portions of the die are drilled with vertical holes 6 near their centre of gravity so as to accommodate springs 7 normally in compression tending to urge the two halves apart from one another.
  • the frusto-conical shape of the exterior of the die 5 and the internal surface of the constrictor guide 4 are of the same taper and maintain the halves of the die in parallel relation.
  • the flanged ring 31 during its rearward motion also compresses a spring 12 against an outer bearing 13.
  • a slot 14 is provided in the body 1 through which a bolt 15 is screwed into a channel drilled in one of the forks 9 so as to prevent the stem 8 from rotating in a vertical plane.
  • 16 is another slot in the body forming part of the termination of a magazine chamber.
  • 17 is a slot in the stem 8 from which a detonator tube falls into the axial channel thereof when the piston 10 is retracted, and into which another detonator fails when retraction of the stem .8
  • 20 is acoupling head 11 and piston 10.
  • 21 is an adjustable stop motion nut.
  • the electric fuse assembly consisting of insulated leading Wires 22 passing through a cylindrical plug 24 of resiliently deformable rubber-like material and terminating in a matchhead 23 is introduced into the die from the front in its retracted position and may be held approximately in the desired position beyond the converging portion.
  • the succeeding forward stroke of the die causes its halves to come together and thus traps the plug 24 beyond the converging portion of the die.
  • the die however does not necessarily grip the plug tightly.
  • the forward stroke of the piston behind the detonator tube 19 ultimately causes the mouth of the detonator tube to reach the plug and carry it forward until it meets resistance due to the convergence of the die. The tube mouth then rides over the plug and grips it when forced into the convergingportion of the die.
  • the tube and plug then advance together through the narrow portion of the die, thus forming the neck containing the plug.
  • the original position of the plug in the channel is therefore a matter of indifference as long as it is beyond the converging portion of the channel.
  • the retraction of the piston and with it the die enables another detonator tube to fall into position in the channel of the stem 8 and'opens up the die and enables the necked detonator tube to be withdrawn from the front.
  • Fig. 6 the contour of the cylindrical part of the die channel is shown by 25, that of one of the converging portions by 26, which gives place to a smaller cylindrical portion 27 and then to a smaller converging portion 28 leading to an even smaller cylindrical portion 29 which is outwardly flared as shown at 30.
  • Apparatus for closing the open end of a detonator tube around a resilient closing element comprising a divided die mounted for movement between an open position and a closed position, said die in its closed position defining a channel having a longitudinally ex-' tending detonator tube receiving portion and an inwardly tapered portion communicating therewith, means for moving said die into its closed position, means movable through an operative path for effecting a relative longitudinal movement between said die and a detonator tube positioned adjacent thereto, means operatively associated with said relative movement effecting means and said die closing means for actuating the latter to close said die in response to the initial movement of said relative movement effecting means through said operative path, said relative movement effecting means being oper- I able upon further movement through said operative path to effect an interengaging relative longitudinal movement between the inwardly tapered portion of said die channel and the open end of the detonator tube so as to deform the latter inwardly into engagement with a resilient closing element disposed therein.
  • Apparatus for closing the open end of a detonator tube around a resient cl .ing element comprising a divided die movable betwe .n an open position and a closed position, guide means receiving said die, a driving member connected with said die for reciprocating the latter within said guide means to effect the movement of said die into its open and closed positions, said die in its closed position defining a channel having a detonator tube receiving portion and an inwardly tapered portion communicating therewith, a plunger slidably mounted within said driving member for movement toward and away from said die, and means operatively connected between said plunger and said driving member for moving the latter to effect the movement of said die into its closed position in response to the initial movement of said plunger toward said die, said plunger bebrings said slot 17 into alignment with slot 16.
  • detonator tubes 19 are presented with their closed ends ing operable upon further movement thereof toward said die to force the open end of a-detonator tube disposed within the receiving portion of the die channel into engagement with the inwardly tapered portion thereof whereby the open end is deformed inwardly into engagement with a resilient closing element disposed therein.
  • said die comprises a pair of die elements having a spring therebetween normally urging the same radially apart and wherein the inner end of each die element is connected with said driving member by means of a dove tail connection operable to prevent relative longitudinal movement between the die elements and the driving member and to permit radial movement of the die elements with respect to each other.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Adornments (AREA)
US227574A 1950-06-02 1951-05-22 Machine and method for the production of blasting detonators and improved blasting detonators Expired - Lifetime US2773410A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB293703X 1950-06-02

Publications (1)

Publication Number Publication Date
US2773410A true US2773410A (en) 1956-12-11

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ID=10290454

Family Applications (1)

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US227574A Expired - Lifetime US2773410A (en) 1950-06-02 1951-05-22 Machine and method for the production of blasting detonators and improved blasting detonators

Country Status (7)

Country Link
US (1) US2773410A (de)
BE (1) BE503707A (de)
CH (1) CH293703A (de)
DE (1) DE907756C (de)
FR (1) FR1043058A (de)
GB (1) GB695956A (de)
NL (2) NL161674B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110145979A (zh) * 2019-06-19 2019-08-20 武汉大华激光科技有限公司 一种基础雷管自动转模台
CN110577455A (zh) * 2019-08-30 2019-12-17 长春汇维科技股份有限公司 一种雷管自动化生产中的组合模具
CN110577453A (zh) * 2019-08-30 2019-12-17 长春汇维科技股份有限公司 一种雷管卡口自动化生产设备
WO2021080513A1 (en) * 2019-10-23 2021-04-29 Orica International Pte Ltd Automated systems and apparatuses for storing, transporting, dispensing, and tracking initiation device components configurable for initiating explosive material compositions

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB257649A (en) * 1925-05-25 1926-08-25 Richard Henry Harriss Improved means for attaching detonators to lengths of safety fuse
US1949822A (en) * 1933-08-11 1934-03-06 John F Wiggert Automatic blasting cap crimping device
US2171371A (en) * 1937-12-24 1939-08-29 Du Pont Crimping device
US2218904A (en) * 1937-01-23 1940-10-22 American Chain & Cable Co Process of and means for applying elastic sleeves on conduits and the like
US2476370A (en) * 1945-01-19 1949-07-19 Hercules Powder Co Ltd Electric initiator device and ignition composition
US2478415A (en) * 1948-05-22 1949-08-09 Du Pont Blasting initiator
US2515780A (en) * 1946-05-18 1950-07-18 Hercules Powder Co Ltd Blasting cap manufacture
US2532770A (en) * 1946-05-10 1950-12-05 Atlas Powder Co Assembly of electric explosion initiators

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB257649A (en) * 1925-05-25 1926-08-25 Richard Henry Harriss Improved means for attaching detonators to lengths of safety fuse
US1949822A (en) * 1933-08-11 1934-03-06 John F Wiggert Automatic blasting cap crimping device
US2218904A (en) * 1937-01-23 1940-10-22 American Chain & Cable Co Process of and means for applying elastic sleeves on conduits and the like
US2171371A (en) * 1937-12-24 1939-08-29 Du Pont Crimping device
US2476370A (en) * 1945-01-19 1949-07-19 Hercules Powder Co Ltd Electric initiator device and ignition composition
US2532770A (en) * 1946-05-10 1950-12-05 Atlas Powder Co Assembly of electric explosion initiators
US2515780A (en) * 1946-05-18 1950-07-18 Hercules Powder Co Ltd Blasting cap manufacture
US2478415A (en) * 1948-05-22 1949-08-09 Du Pont Blasting initiator

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110145979A (zh) * 2019-06-19 2019-08-20 武汉大华激光科技有限公司 一种基础雷管自动转模台
CN110145979B (zh) * 2019-06-19 2024-02-02 武汉瑞镭科技有限公司 一种基础雷管自动转模台
CN110577455A (zh) * 2019-08-30 2019-12-17 长春汇维科技股份有限公司 一种雷管自动化生产中的组合模具
CN110577453A (zh) * 2019-08-30 2019-12-17 长春汇维科技股份有限公司 一种雷管卡口自动化生产设备
WO2021080513A1 (en) * 2019-10-23 2021-04-29 Orica International Pte Ltd Automated systems and apparatuses for storing, transporting, dispensing, and tracking initiation device components configurable for initiating explosive material compositions
US20220349692A1 (en) * 2019-10-23 2022-11-03 Orica International Pte Ltd Automated systems and apparatuses for storing, transporting, dispensing, and tracking wireless initiation device components configurable for initiating explosive material compositions

Also Published As

Publication number Publication date
BE503707A (de)
NL82349C (de)
NL161674B (nl)
CH293703A (de) 1953-10-15
GB695956A (en) 1953-08-19
DE907756C (de) 1954-03-29
FR1043058A (fr) 1953-11-05

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