EP0273777A1 - Magasin contenant des charges explosives pour outil d'enfoncement avec piston - Google Patents

Magasin contenant des charges explosives pour outil d'enfoncement avec piston Download PDF

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Publication number
EP0273777A1
EP0273777A1 EP19870311549 EP87311549A EP0273777A1 EP 0273777 A1 EP0273777 A1 EP 0273777A1 EP 19870311549 EP19870311549 EP 19870311549 EP 87311549 A EP87311549 A EP 87311549A EP 0273777 A1 EP0273777 A1 EP 0273777A1
Authority
EP
European Patent Office
Prior art keywords
base
cartridge
gun
closure means
cap
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.)
Withdrawn
Application number
EP19870311549
Other languages
German (de)
English (en)
Inventor
Edward W. Bowman
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.)
Bowman E W Inc
Original Assignee
Bowman E W Inc
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 Bowman E W Inc filed Critical Bowman E W Inc
Publication of EP0273777A1 publication Critical patent/EP0273777A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/08—Hand-held nailing tools; Nail feeding devices operated by combustion pressure
    • B25C1/10—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge
    • B25C1/16—Cartridges specially adapted for impact tools; Cartridge and bolts units
    • B25C1/163—Cartridges

Definitions

  • the present invention relates to a plastic cased propellant (explosive) magazine for use in a powder driven bolt setting gun.
  • a magazine comprising a series of equally spaced propellant (explosive) encasing cases, each case having a metal base enclosure and a skirt integrally formed with the interior wall of the case proximate the metal base enclosure.
  • Disposable magazines for use in explosive powder driven bolt setting guns have been known and certain disadvantages have been experienced with types of propellants formed with non-ferrous metal casings as well as with caseless propellant charges.
  • these devices include drive engaging means (eg. notches) formed on the strip so that the strip can be advanced by the gun and properly aligned with the firing hammer or detonation pin in the gun to thereby explode the respective charge.
  • the magazine component that contains the propellant is a two component system comprising a plastic carrier, having a series of holes, and brass cartridges that fit into the holes. Brass is expensive, and the deep-drawing of brass, is a complex expensive art.
  • a further disadvantage with cartridge shells formed from non-ferrous metal occurs where hot burning gases from ignition unintentionally leak into the firing mechanism of the tool.
  • Yet a further disadvantage of cartridge shells formed from non-ferrous metals is that regardless of the powder load used, the interior volume of the shell is not variable.
  • a common method of reducing the firing impact for light loads is to dilute the powder with paper or other fillers. This creates an undesirable result because it increases the amount of residue and impurities that can penetrate into the firing mechanism of the tool.
  • Caseless charges have been designed in order to avoid the expense of deep drawing non-ferrous metals. Disadvantages have been experienced with such caseless charges however, because dangerous ignition of adjacent propellant charges has sometimes occurred due to lack of a combustion sealing mechanism between the cartridges.
  • a caseless charge magazine which eliminates this danger is disclosed in U.S. Patent 4,406,079 which describes a strip of caseless charges wherein the propellant charge is displaced into the gun for ignition. Because of this requirement, the system is incompatable with one of the more widely used types of guns because substantial differences occur in the type of powder actuated gun in which the propellant can be used.
  • U.S. Patent No. 2,918,868, Ringdal discloses an invention relating to a cartridge comprising a base having a tubular extension and a case which consists of relatively elastic flexible synthetic resin material, such as polyethylene or polyvinylchloride.
  • the attachment of the case and cartridge base to each other is secured by means of a bead on the one member in engagement with a corresponding groove in the other member.
  • U.S. Patent No. 3,318,245, Ferri et al., issued 9 May, 1967 discloses strip ammunition for toy guns wherein a plurality of discrete explosive charges are contained in container means. Stalk means interconnects each container means, Stop means are formed on the stalk means for engagement by an advancing means of a toy gun. In this way the strip can be advanced by the space between each container means each time the gun is fired.
  • U.S. Patent No. 4,294,173, Ferri, issued 13 October, 1981, discloses ammunition for a toy-weapon comprising an injection molded support having seats for explosive charges. The charges are sealed within the seats by a separate cover for each seat. The covers are injection moulded simultaneously into the seats of the support.
  • U.S. Patent No. 3,349,710, Sposimo, issued 31 October, 1967 discloses a strip carrier for explosive socket caps for toy guns.
  • the explosive is encased in wells which are capped by a series of caps strung together in series.
  • U.S. Patent No. 3,611,870, Udert, issued October, 1971, discloses a cartridge magazine construction in which the cartridge is placed in a narrow band having a plurality of tubular projections formed therein. Each projection holds a single cartridge.
  • Cartridge holding collars are formed at each of the holes by bulging or plastically deforming the strip in the region of these holes so as to form a clamping seal spaced from the plane of the strip for clampingly annealing cartridges held at the strip.
  • Various preferred embodiments include various cross-sectional configurations of the holding collars.
  • the method of making the magazine apparatus includes forming the collars by a multiple-­step bulging process wherein the last bulging step is formed by the cartridges as they are inserted into position on the strip.
  • a cartridge holding space for a caseless charge is formed by the combination of a cartridge recess in a band-shaped magazine body and a torus-shaped body superimposed on the magazine body to form an extension of the recess.
  • Various configurations of the cartridge holding space and the exterior of the torus-shaped body can be used.
  • a variety of openings can be provided through the cartridge holding space to prevent destruction of the magazine parts when the caseless charge is ignited.
  • U.S. Patent No. 4,406,079, Buechel, issued 27 September, 1983 discloses a magazine for caseless propellant charges, such as those used in a fastening element setting device.
  • the magazine consists of an elongated strip-like member. Cut-outs are provided in the strip-like member and a caseless charge holder is secured in each cut-out by webs. A caseless charge and the holder are displaced out of a cut-out when a sufficient force is directed against the holder to separate the webs from the strip-like member.
  • a circular bulb-ended opening 26 is formed in the wall of the cartridge member 16 between the cavity 24 and the base 12.
  • a curved lip 28 extends outwardly from the rim of the metal cap 22. This lip 28 engages the bulb-end of the opening 26 and snuggly secures the metal cap 22 in position to close opening 20.
  • Cap 22 has an internal peripheral channel 30 at its base.
  • Channel 30 is designed to receive the primer which, upon strong impact, detonates the charge contained in the main body of cavity 24 of cartridge member 16.
  • Figure 3 also illustrates a weakness crease 32 which is formed in the top region of the cavity 24 remote from opening 20 and cap 22.
  • the crease 32 can be formed in the shape of an "X". The crease 32 assists in enabling the detonated charge contained in cavity 24 bursting through the top of the cartridge member 16 into the barrel of the ram-set gun.
  • propellant containing devices of the prior art where deep drawn brass casings are used, not only is there high cost involved but also there is the expense of installing the priming composition into the percussion cap rim (channel 30). This can be an awkward and expensive procedure because of the depth of the persussion cap.
  • the embodiment depicted in Figures 3 and 4 avoids these disadvantages by the use of subtle design features which will be explained below in detail.
  • the embodiment illustrated in Figures 3 and 4 is particularly characterized by a circumferential opening 26 at the base of each cartridge member 16.
  • This openings 26 receives the upwardly extending circular wall 40 of the percussion cap 22.
  • the height of the wall 40 is substantially less than the height of the walls of conventional deep drawn brass cartridges, thus minimizing the complexities and expense of deep drawing metal.
  • the upper region of opening 26 is widened in the form of a bulb 34.
  • the inner wall of opening 26 facing cavity 24 forms a downwardly extending circumferential skirt 36.
  • This skirt 36 separates the opening 26 from the interior 24 of the cartridge member 16.
  • the circumferential skirt 36 extends from the widened bulb portion 34 to a point close to the interior of the base of the percussion cap closure 22.
  • the percussion cap 22 has an upstanding wall 40 which abuts the outer wall of the opening 26.
  • a inwardly curved lip 28 at the upper end of the upstanding wall 40 is received in and engages the widened portion 34 of the circumferential opening 26.
  • the lip 28 is curved inwardly to ease assembly of the cap 22 into the opening 20 of the cartridge member 16. However, the lip 28 could be curved outwardly if it was considered advantageous for some reason.
  • the skirt 36 acts as a sealing member against the wall 40 of the percussion cap 22.
  • the skirt 36 prevents gases generated by ignition of the primer and charge from reverse escaping between wall 40 and member 16 into the breach action of the firing gun. Specifically, gas pressures generated by ignition of the primer and gunpowder in the interior of cap 22 and cavity 24 deflect the plastic skirt 36 radially outwardly against the circumferential metal wall 40 of the percussion cap 22.
  • the sealing effect is proportional to the gas pressure because the greater the pressure, the greater the outward deflection of skirt 26.
  • the sealing mechanism is enhanced further by forcing wall 40 against the outer wall of opening 26.
  • percussion caps 22 are merely push fit into opening 26, and not adhesively sealed in any way, they are nevertheless held tightly in association with the cartridge members 16 because the lip 28 fits snuggly within the widened portion 34 thereby providing resistance to uncoupling of the cap 22 and the member 16.
  • the thickness of the wall of member 16 is tapered upwardly so that the thin section is at the top remote from the cap 22 and opening 20. This encourages the gases generated upon ignition of the primer and charge to expell upwardly, and split open the top of the member 16 through creases 32. The detonation gases are then directed into the barrel of the ram-set gun rather than rearwardly into the breach of the gun.
  • the cavity 24 of cartridge member 16 is filled with powder (not shown) and the channel 30 of cap 22 is charged with a detonator charge (primer).
  • the cap 22 is non-removeable and is held tightly by the cartridge member 16 and base 12. The dimensions are specified so that the firing pin will impact in one of two identified locations on the base of the circumference 30 of the primer cap 22.
  • the detonator charge (primer) present in the cap 22 may simply be spot located in the cap 22 and in order to be effective need not occupy the full circumference of the cap as in prior devices in order to be effective.
  • a further advantage of spot locating the primer is that simpler and less expensive methods of inserting the primer compound in the primer cap can be used, compared to using a complex method of locating the primer fully throughout the circumference of the rim 30 of the primer cap 22.
  • a relatively inexpensive method of spot locating the primer compound in the channel 30 can be injection by compressed air.
  • the skirt 36 apart from its inherent sealing qualities has the advantage that it allows the cavity 24 of the cartridge member 16 to hold more powder without interfering with the fit of cap 22 in the opening 20 of the cartridge member 16.
  • Figures 5 and 6 illustrate variations of the device 10 where the external wall of each conical projection 16 is a stepped projection extending upwardly from the base 12.
  • the exterior is stepped inwardly in a direction toward the upper tip of the cartridge 16.
  • the angular taper of each of the outside walls of the plastic propellant casing is designed so that it is slightly less than the cone angle of the cartridge chamber of the gun in which it is to be fired. In this way, there is more than one sealing point between the shoulders of the steps and the inner wall of the propellant chamber of the gun.
  • the steps not only serve to seal the chamber at multiple points but together with the conical wall of the cartridge chamber of the gun define two shock absorption cavities between them.
  • FIG. 5 depicts a preferred embodiment of a stepped design
  • the first shoulder 42 and the second shoulder 46 define between them a shock absorption cavity 44 which serves as a high pressure gas pressure absorption space.
  • Cavity 44 assists the sealing action both before and during firing and assists in ejection of the member 16 from the cartridge chamber of the gun after detonation.
  • the primer 48 is located on the interior base of the cap 22 and the gunpowder 50 is positioned in the interior cavity 24.
  • Figure 6 illustrates a section view of an alternative design of exterior stepped cartridge member 16.
  • This design has a first arcuate shoulder 52 and a second arcuate shoulder 56, which are separated by a right angle shoulder 54, to define two gas pressure absorption cavities. This is in contrast to the single cavity 44 depicted in the device 10 illustrated in Figure 5. In certain instances, it may be found by experimentation that it is preferable to have two gas pressure cavities to assist in sealing action.
  • Figure 7 is a section view of an embodiment of the device utilizing a solid propellant in tablet form.
  • Device 10 includes a solid pressed gunpowder tablet 58 rather than loose gunpowder.
  • the plastic cavity 24 is loaded by pouring or pressing the tablet 58 in place while it is still wet.
  • the powder tablet 58 is spaced from the internal floor of the closure cap 22 by means of a thermal plastic washer 60. Ignition is initiated by means of a conventional center fire priming device, or a piezzo electric device 62 as shown in Figure 7.
  • the closure cap 22 has a central hole 64 formed therein to enable entry of the firing mechanism. If desired, a plurality of channels 64 can be formed in the interior wall 24 of the plastic casing 16. The purpose of such channels 64 is to allow upon ignition a flow of burning gases from all areas on the circumference of the solid powder tablet 58 to the barrel of the gun (now shown).
  • Figure 8 illustrates a sectional view of a variation of the device 10 with a thicker base for the cap 22. This provides enhanced protection against detrimental reverse explosion forces.
  • the base of the cap 22 has a central pin opening 64, with a centre fire precussion cap 66, for ignition action.
  • the design of the cap 66 is conventional.
  • the embodiment shown in Figure 8 varies from that of Figure 7 in that it uses a centre-fire primer rather than a rim-fire mechanism. Because of the lack of rim-fire primer, the skirt does not have the very thin end tip at the radial circumference.
  • the base of the metal closure cap 22 should preferably be formed of a thicker material in order to accommodate the center-fire priming device.
  • Figures 9, 10 and 11 illustrate an embodiment of the device 10 wherein the cap 22 is formed of a high tensile strength thermal plastic such as a carbon-fibre impregnated nylon rather than a non-ferrous metal (brass). This has the advantage of reduced cost.
  • a single shoulder step 68 is formed on the exterior of the conical protrusion 16.
  • the skirt 36 on the exterior of the conical protrusion 16 has the same function as in the embodiments of the propellant device previously described.
  • the molded inward curl 70 of the upper end of the plastic closure cap 72 has a rounded shape which deters collapse of the curl 70 and rim 74 during assembly.
  • the embodiment illustrated in Figures 9 to 11 has a base closure cap 72 formed from plastic rather than non-ferrous metal. Notwithstanding, this embodiment is useable in a conventional powder actuated gun which requires rim-fire propellants. Rim-fire technology requires that the rim of the propellant closure, when struck by the firing pin of the gun, is compressed between two pieces of metal, thus causing the primer to detonate. To facilitate this, one surface of each of two rings 76 of non-ferrous metal are coated with priming compound 78 and are then molded into the closure cap 72 as it is formed. In order to prevent detonation of the priming compound 78 by the heat of the injection molding process, a slow drying additive is blended into the priming compound while it is still in water-based slurry form. Further priming occurs after the non-ferrous metal rings 76 are formed within the plastic closure cap 72 by coating the interior base of the closure cap 72 with a common mixture of priming compound.
  • the plastic-cased propellant magazine has a number of important advantages over similar devices available commercially. Some of the advantages are:

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
EP19870311549 1987-01-02 1987-12-31 Magasin contenant des charges explosives pour outil d'enfoncement avec piston Withdrawn EP0273777A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US24387A 1987-01-02 1987-01-02
US243 1987-01-02
US9330287A 1987-09-04 1987-09-04
US93302 1987-09-04

Publications (1)

Publication Number Publication Date
EP0273777A1 true EP0273777A1 (fr) 1988-07-06

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EP19870311549 Withdrawn EP0273777A1 (fr) 1987-01-02 1987-12-31 Magasin contenant des charges explosives pour outil d'enfoncement avec piston

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0377924A1 (fr) * 1988-12-09 1990-07-18 Edward W. Bowman Magasin contenant des charges explosives pour outil d'enfoncement avec piston
AU627007B2 (en) * 1989-03-31 1992-08-13 Hilti Aktiengesellschaft Band-shaped loading strip
EP0525613A1 (fr) * 1991-07-24 1993-02-03 Dynamit Nobel Aktiengesellschaft Cartouche en plastique et magasin-ruban en plastique pour cartouches
EP0608776A1 (fr) * 1993-01-26 1994-08-03 Dynamit Nobel Aktiengesellschaft Cartouche en plastique pour un dispositif de tir, notamment un dispositif scellement de chevilles

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3435765A (en) * 1966-04-28 1969-04-01 Dynamit Nobel Ag Cartridge
DE2324183A1 (de) * 1973-05-12 1974-11-28 Tornado Gmbh Anordnung eines treibladungspresslings fuer bolzensetzgeraete oder dgl. mit magazin

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3435765A (en) * 1966-04-28 1969-04-01 Dynamit Nobel Ag Cartridge
DE2324183A1 (de) * 1973-05-12 1974-11-28 Tornado Gmbh Anordnung eines treibladungspresslings fuer bolzensetzgeraete oder dgl. mit magazin

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0377924A1 (fr) * 1988-12-09 1990-07-18 Edward W. Bowman Magasin contenant des charges explosives pour outil d'enfoncement avec piston
AU627007B2 (en) * 1989-03-31 1992-08-13 Hilti Aktiengesellschaft Band-shaped loading strip
EP0525613A1 (fr) * 1991-07-24 1993-02-03 Dynamit Nobel Aktiengesellschaft Cartouche en plastique et magasin-ruban en plastique pour cartouches
US5279201A (en) * 1991-07-24 1994-01-18 Dynamit Nobel Aktiengesellschaft Plastic cartridge and plastic cartridge-belt magazine
EP0608776A1 (fr) * 1993-01-26 1994-08-03 Dynamit Nobel Aktiengesellschaft Cartouche en plastique pour un dispositif de tir, notamment un dispositif scellement de chevilles

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