US3554424A - Push to fire explosive tools - Google Patents

Push to fire explosive tools Download PDF

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Publication number
US3554424A
US3554424A US746220A US3554424DA US3554424A US 3554424 A US3554424 A US 3554424A US 746220 A US746220 A US 746220A US 3554424D A US3554424D A US 3554424DA US 3554424 A US3554424 A US 3554424A
Authority
US
United States
Prior art keywords
barrel
piston
charge
tool
firing
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
US746220A
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English (en)
Inventor
Albert E Newton
Paul G Rumball
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.)
USM Corp
Original Assignee
USM Corp
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Filing date
Publication date
Application filed by USM Corp filed Critical USM Corp
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Publication of US3554424A publication Critical patent/US3554424A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B25C1/18—Details and accessories, e.g. splinter guards, spall minimisers
    • B25C1/182—Feeding devices
    • B25C1/186—Feeding devices for cartridges or pellets
    • 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
    • B25C1/082—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a pellet
    • B25C1/087—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a pellet operated by a hammer blow
    • 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
    • B25C1/18—Details and accessories, e.g. splinter guards, spall minimisers

Definitions

  • This invention relates to the provision of an improved low cost explosively operated construction tool, especially for delivering a driving or forming blow. It is particularly concerned with providing an economical and reliable one-hand operable tool of this type which is especially useful in applying considerable impact force for driving studs or nails into hard materials even in working areas which are restricted or have limited access.
  • Explosive driving devices currently areavailable which require an operator to hold them against a workpiece with one hand while he swings a hammer with the other hand to strike a tool head, thus percussively causing a primer to effect explosion of a cartridge.
  • An example of this general type of tool, but as revised to employ primerless charges, is disclosed for instance in U.S. Pat. No. 3,395,843, issued on Aug. 6, 1968 on an application in the name of Robert C. Kvavle. It is often found to be a nuisance to have to be concerned with the ejection of spent cartridges, to have to reload separate charges manually, and to have to utilize explosive devices requiring complex cocking mechanism, or to swing a firing hammer when there is no sufficiently clear working space.
  • the present invention accordingly aims to overcome these handicaps while providing a safe, simple and economical tool especially for onthe-job construction purposes.
  • the invention is embodied in a tool comprising a push or hammer-to-fire operating cap carrying a firing pin, a transversely slotted barrel telescoping in the cap, a vented anvil-feed slide in the barrel slot for carrying a primerless charge into operative relation to the firing pin, and a fastener driving piston axially slidable in the bore of the barrel to and from operative relation with the feed slide.
  • the illustrative combination further includes, mounted on one end of the barrel, a work-engageable guide for an end of the piston and a fastener to be driven thereby, relative axial movement of the operating cap and the barrel causing the firing pin to explode the charge fed in said slide and thereby urge the piston to drive the fastener into a workpiece.
  • the mass of the cap may, in effect, serve as its own ignition hammer.
  • a finger-retractable safety is normally interposed between the cap and an end of the barrel positively to prevent ignition by spacing the impact end of the firing pin from the charge to be ignited in the feed slide until the moment operation is desired.
  • a further safety feature resides in the provision of novel mechanical means for positively preventing operation of the driving piston in a fastener inserting tool (or an equivalent punch or former) until its yieldably mounted nosepiece is relatively retracted with respect to the barrel by reason of endwise engagement with a workpiece.
  • a pair of pivotally related safety levers spring-urged into closed or pistonabutting relation are swung apart to allow piston operation only in response to the levers being cammed open by an inner portion of the piston guide in the course of relative axial displacement of the nosepiece and the guide.
  • FIG. 1 is a view in elevation of a fastener driving tool powered by primerless charges to be successively fed in a slide, an operating cap being shown in retracted position on a barrel;
  • FIG. 2 is an axial section of the tool shown in FIG. l, the parts now being advanced to ready-tofire position, a fastener driving piston having been retracted and a charge and stud loaded;
  • FIG. 3 is a section corresponding to the muzzle end of the tool shown in FIG. 2, the muzzle now engaging a workpiece with pressure to open safety mechanism permitting operation of the piston;
  • FIG. 4 is a transverse section taken on the line IV-IV of FIG. 2;
  • FIG. 5 is a view corresponding to FIG. 3, the tool being turned about its longitudinal axis;
  • FIG. 6 is an axial section taken on the line Vl-VI of FIG. 4.
  • the illustrative tool comprises a hollow operating cap 10 (FIGS. l6) telescoped on a cylindrical barrel 12, the outer diameter of the cap preferably being of a dimension to be'conveniently grasped by one hand. While in principle the tool can be designed for individual loading of explosive primerless charges C of the type above-mentioned, the cap 10 desirably has formed thereon a tubular longitudinal portion 14 for slidably receiving a magazine tube 16 affixed to the barrel 12 by means of screws 18, 18, (FIG. 2) thebore of the tube accommodating a stack of the disclike charges C to be successively fed and fired as will later be described.
  • the cap 10 has axially secured to its head end 20 (FIGS. 1 and 2) by means of a set screw 22 a firing pin 24 having a positioning flange 26 extending adjacent to the inner end of the cap.
  • a firing pin 24 having a positioning flange 26 extending adjacent to the inner end of the cap.
  • most of one side of the latter is longitudinally slotted as at 28 (FIG. 1) and a set screw 30 threaded in the cap is arranged to slide in the slot 28.
  • a ball plunger 32 (FIGS. 1 and 2) nested in the barrelyieldably projects into a recess 33 formed in the sidewall of the cap.
  • a fastener driving piston 34 to be driven by the expanding gasses of combustion is slidable axially in a bore 36 of the barre] 12 and has a stem 38 which is received in a coaxial bore of a guide sleeve 40.
  • the latter hereinafter further referred to, serves as a stop for the piston 34 and is secured in an endof the barrel by means of a set screw 42 (FIGS. 1-3 and 5).
  • a set screw 44 For frictionally holding the piston 34 in its upper or ready-to-fire position shown in FIGS. 2 and 6, an O-ring 44 (FIGS. 2. 3 and 5) preferably is seated in the guide sleeve 40.
  • a radial hole 46 In order to relieve pressure in the barrel bore 36 ahead of the piston 34, a radial hole 46 (FIG.
  • a nose portion of the sleeve 40 is internally tapered frictionally to receive and hold a fastener to be driven, such as a stud S (FIGS. 2, 3 and 5), and yieldably supports safety mechanism, generally designated 54, later to be explained.
  • the barrel 12 is formed with a transverse slot 56 slidably to carry a finger-controlled combination feed slide-and-anvil 53.
  • the member 58 is generally rectangular in cross section, has a knurled finger grip end, and has its fiat upper surface projecting to provide a trap door or gate-portion60 underlying the stack of charges C in the tube 16.
  • a follower spring 62 extending in the tube 16 is backed by a pivotal cover 64 (FIG. 2) on the tube 16.
  • An inner portion of the slide58 is formed with a circular firing chamber 06 adapted to receive the successive charges C when the slide is partly withdrawn from the barrel as shown in FIG. 1.
  • a set screw 68 (FIG. 1) in the barrel 12 extends into a slot 70 in the slide 58 to limit its transverse motion between a charge pickup position (FIG. 1) wherein the chamber 66 is aligned with the magazine tube 16 and the firing position (FIG. 2) wherein the chamber 66 is in alignment with the striker end of the pin 24.
  • the safety cap 10 may now be relatively telescoped from its position shown in FIG. 1 to its position shown in FIG. 2, the plunger 32 latching the assembly in ready-to-fire condition.
  • the charge C preferably is of a character such that it cannot be exploded without being confined in a-substantially closed chamber 66.
  • the pin 24 now has its striker end in close proximity to one side of the charge, and a pair of axial ports 72, 72 (FIG. 2) in the anvil portion of the slide 58 interconnect the firing chamber 66 with an enlarged bore 74 in the slide 58 adapted snugly to receive the piston 34.
  • a convenient probe may be safely used.
  • the first acts to prevent drop-fire and is in the form of a pin 76 (FIGS. 2 and 6) slidable in a radial slot 78 in the cap 10 adjacent to its inner end.
  • the pin 76 is thicker than the firing pin flange 26 in order positively to prevent ignition contact of the firing pin 24 with a charge C fed by the slide 58.
  • One end of the pin 76 is connected to a finger operated lever 80 pivoted at 82 (FIG. 6) to the cap 10.
  • a spring 84 having its ends respectively nested in the cap and an end of the lever 80 constantly urges the pin 76 into position to bar explosive operation of the tool.
  • the second safety mechanism designated 54 as referred to above, makes it almost impossible for the tool to eject a fastener to injure anyone even if accidental firing occurs.
  • a cup-shaped nosepiece 88 (FIGS. l3, is axially yieldable on the sleeve 40. Its smaller nose end is formed with opposed guide slots 90, 90 for slidably receiving aligned pins 92, 92 respectively secured in the sleeve 40.
  • a compression spring 94 confined between an end of the barrel 1 2 and an internal shoulder of the nosepiece 88 urges them axially apart.
  • the operator may use some convenient probe to move the piston stem 38 axially from its driven position (FIG. 1) to its upper or initial operating position (FIG. 2) in the slide bore 74.
  • the stem moves inwardly beyond the safety jaws 100, they tend to snap closed. fully closing upon probe removal to bar tool operation even if the loaded charge be accidentally ignited.
  • the probe thus moving the piston 34 rearwardly against the anvil portion of the slide 58, the probe could not act through the piston to force the firing pin against, the charge and thereby accidentally effect ignition.
  • the reason for this is that the slide 58, as best shown in FIG.
  • the invention affords an economical, trouble-free tool.
  • the firing pin impact of the charge C as it is substantially confined in its anvil chamber 66 produces very little recoil on the cap 10, the gases of combustion being directed through the ports 72 to drive the piston 34 and hence the stud S into the work.
  • the tool may be adapted for generating and directing fluid pressure, for installing other fasteners, for punching holes or otherwise forming hard materials.
  • the one-hand push-to-fire capability offers particular advantage in restricted working space, and the ease of reloading plus inherent safety in operation assure good performance rates. I
  • An explosive tool comprising an operatingcap carrying a firing pin, a transversely slotted barrel telescoped in the cap, an anvil feed slide having a firing chamber and movable in the barrel slot for carrying a charge into operative relation to the firing pin, and a fastener driving piston axially slidable in the bore of the barrel and to and from a position in communication with the firing chamber. when the anvil feed slide is in operative relation to the firing pin.
  • a tool as set forth in claim 1 wherein there is a magazine secured to the barrel for carrying'a spring-pressed stack of charges for successive delivery into the firing chamber of said anvil feed slide.
  • An explosive tool comprising a cylindrical operating cap closed at one end, a firing pin secured to and projecting axially from said end, a tubular barrel axially telescoped in the cap and having two spaced coaxial bores, one of said bores being 4.
  • feed means is in the form of an anvil slide having its firing chamber recessed in one side thereof, an opposite side of the slide being formed with a recess to receive the piston, and vents axially connect the slide firing chamber with said piston recess.
  • a tool as set forth in claim 3 wherein, when said feed means supports a charge for ignition by the firing pin, a detent means operative between the cap and the barrel is arranged to position an impacting end of the firing pin in the feed means closely adjacent to the charge.
  • An explosive tool comprising a relatively reciprocable tubular barrel and an external operating member carrying a firing pin, the barrel having an axial bore for slidably guiding a fastener driving piston and a transverse guideway extending between the pin and the piston, a sliding anvil movable in the guideway and providing a vented firing chamber for confining a primerless charge in position to be impacted by the firing pin, and a sleeve secured to an end of the barrel for holding a fastener to be driven and for guiding the stem of said piston during fastener driving.
  • an explosive tool having a tubular barrel.
  • relatively movable firing means for igniting a charge therein, and a piston axially slidable in the bore of the barrel for driving a fastener in response to the explosion of said charge.
  • safety means mounted on the barrel for barring premature operation of the piston, said safety means comprising a sleeve for guiding the piston and the fastener to be driven thereby, a nosepiece yieldingly retractable on the sleeve when urged into engagement with a workpiece intended to receive the fastener, and abutment means movably mounted in the sleeve and normally arranged to prevent fastener driving movement of the piston, said abutment means being yieldingly shiftable in response to relative movement of the sleeve and the nosepiece to permit operation of the piston.
  • said abutment means includes a pair of jaws pivotally supported in the sleeve and biased to block the operating path of the piston. the jaws being arranged respectively to be cammed to open position by engagement therewith of the nosepiece during its relative retraction.
  • a manually controlled device for generating fluid pressure to be directed by a tubular barrel.
  • an operating member relatively movable on one end of the barrel to actuate a firing pin axially in the bore of said barrel, a feeding anvil reciprocably movable transversely of the barrel bore said anvil having a firing chamber recessed in one surface to receive a primerless explosive charge externally of the barrel and then support the charge within the bore for impact ignition by said pin, said anvil having a vent extending from the firing recess in said surface to an opposite anvil surface, and means limiting the anvil movement in one direction to align the firing chamber with said pin and the anvil vent with said barrel bore.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US746220A 1968-07-19 1968-07-19 Push to fire explosive tools Expired - Lifetime US3554424A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US74622068A 1968-07-19 1968-07-19
US19046171A 1971-11-01 1971-11-01

Publications (1)

Publication Number Publication Date
US3554424A true US3554424A (en) 1971-01-12

Family

ID=26886137

Family Applications (2)

Application Number Title Priority Date Filing Date
US746220A Expired - Lifetime US3554424A (en) 1968-07-19 1968-07-19 Push to fire explosive tools
US27628D Expired USRE27628E (en) 1968-07-19 1971-11-01 Fire explosive tools

Family Applications After (1)

Application Number Title Priority Date Filing Date
US27628D Expired USRE27628E (en) 1968-07-19 1971-11-01 Fire explosive tools

Country Status (5)

Country Link
US (2) US3554424A (fr)
CH (1) CH481727A (fr)
DE (1) DE1919245C3 (fr)
FR (1) FR2014653A1 (fr)
GB (1) GB1233657A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942700A (en) * 1973-09-27 1976-03-09 Hilti Aktiengesellschaft Safety device for a fastening element setting gun
US3973708A (en) * 1974-04-25 1976-08-10 Hilti Aktiengesellschaft Setting tool containing a laval nozzle
US3981424A (en) * 1974-07-29 1976-09-21 Hilti Aktiengesellschaft Explosive charge driven setting gun
US4006786A (en) * 1975-07-22 1977-02-08 M. E. Cunningham Company Power actuated portable marking tool
US4323127A (en) * 1977-05-20 1982-04-06 Cunningham James D Electrically operated impact tool
US20140083282A9 (en) * 2010-09-21 2014-03-27 Ecs Special Projects Limited Attachment/release device and assemblies and systems using same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1533256A (en) * 1974-11-04 1978-11-22 Prospection & Inventions Sealing gun using a case-less ammunition
FR2993810B1 (fr) * 2012-07-25 2014-07-11 Illinois Tool Works Outil de fixation par tir indirect, a support de detente anti-tir

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1365869A (en) * 1919-10-10 1921-01-18 Temple Robert Rxplosively-actuated penetrating means
US2533851A (en) * 1947-07-11 1950-12-12 Portable Ind Inc Tool
US3395843A (en) * 1966-02-23 1968-08-06 United Shoe Machinery Corp Explosively actuated impact tools

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1365869A (en) * 1919-10-10 1921-01-18 Temple Robert Rxplosively-actuated penetrating means
US2533851A (en) * 1947-07-11 1950-12-12 Portable Ind Inc Tool
US3395843A (en) * 1966-02-23 1968-08-06 United Shoe Machinery Corp Explosively actuated impact tools

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942700A (en) * 1973-09-27 1976-03-09 Hilti Aktiengesellschaft Safety device for a fastening element setting gun
US3973708A (en) * 1974-04-25 1976-08-10 Hilti Aktiengesellschaft Setting tool containing a laval nozzle
US3981424A (en) * 1974-07-29 1976-09-21 Hilti Aktiengesellschaft Explosive charge driven setting gun
US4006786A (en) * 1975-07-22 1977-02-08 M. E. Cunningham Company Power actuated portable marking tool
US4323127A (en) * 1977-05-20 1982-04-06 Cunningham James D Electrically operated impact tool
US20140083282A9 (en) * 2010-09-21 2014-03-27 Ecs Special Projects Limited Attachment/release device and assemblies and systems using same
US9677866B2 (en) * 2010-09-21 2017-06-13 Ecs Special Projects Limited Attachment/release device and assemblies and systems using same

Also Published As

Publication number Publication date
DE1919245B2 (de) 1974-01-10
USRE27628E (en) 1973-05-01
DE1919245C3 (de) 1974-08-01
DE1919245A1 (de) 1970-05-27
GB1233657A (fr) 1971-05-26
CH481727A (de) 1969-11-30
FR2014653A1 (fr) 1970-04-17

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