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US3558032A - Hammer ignition explosive tools with safety means - Google Patents

Hammer ignition explosive tools with safety means Download PDF

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Publication number
US3558032A
US3558032A US832751A US3558032DA US3558032A US 3558032 A US3558032 A US 3558032A US 832751 A US832751 A US 832751A US 3558032D A US3558032D A US 3558032DA US 3558032 A US3558032 A US 3558032A
Authority
US
United States
Prior art keywords
barrel
grip
housing
bolt
tool
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
US832751A
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English (en)
Inventor
Richard W Oefinger
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.)
Emhart Enterprises Corp
USM Corp
Original Assignee
USM Corp
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 USM Corp filed Critical USM Corp
Application granted granted Critical
Publication of US3558032A publication Critical patent/US3558032A/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
    • B25C1/082—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

Definitions

  • Johnson ABSTRACT When employed for driving fasteners or the like the tool has a muzzle end yieldably engageable with the work and a hinged housing carrying an element for striking the charge. A barrel breech end receives the charge when the housing is open and holds the charge for ignition when the housing is closed. Safety mechanisms controlled by a hand grip releasably locks the housing in operative position relative to the barrel and prevents firing of the charge unless the muzzle end is first thrust against the work by means of the grip.
  • a caseless charge of the type disclosed in US. Letters Pat. No. 3,372,643, issued Mar. 12, I968 upon an application filed in the name of Robert C. Kvavle is widely used, for instance in construction and industry, because of its convenience and safety, the charge being capable of impact ignition only when confined in a substantially closed chamber.
  • the charge may be nonprimered and yet, like primered cartridges, may be impact ignited in such a chamber.
  • the present invention is principally directed to providing reliable yet convenient safety means in a hand held explosive fastener driving tool, especially one of the type having a manually actuatable striker for igniting a caseless charge, but it will be understood that the invention is applicable also to tools employing conventional case charges.
  • a hand grip secured in coaxial relation to a barrel of the tool is employed to cause its muzzle to bear yieldingly on a work piece and incorporates safety means comprising levers fully operable, and as one member, only when the munle is thus applied to release a cap for impact operation of the striker.
  • the lever mechanism is advantageously arranged to permit such operation of the striker only when a housing therefor is in releasably locked and closed relation to the barrel. So-called dry firing is prevented.
  • an operator On completion of the fastener driving operation, an operator merely removes the tool from the work piece, swings the housing to its breech open position for reloading of another charge, recloses the housing, and, upon insertion in the muzzle end of the next fastener to be driven, is ready for the next cycle of operation.
  • the barrel is formed at its breech end with a cavity to receive and hold the charge, a larger cavity in the barrel receives the piston head of a fastener driving ram, and exhaust vents communicating between the cavities.
  • the striker is constantly urged yieldingly away from the charge-carrying cavity of the barrel, and the igniting end of the striker is formed with a complementally sealed formation cooperative with an annular configuration on the barrel.
  • FIG. I is an axial section of an explosive fastener driving tool in extended or inoperative condition, its bolt housing being closed and a safety block disposed to prevent ignition;
  • FIG. 2 is a view similar to FIG. 1, the tool now being in ready-to-fire condition with the muzzle abutting a work piece;
  • FIG. 3 is an end view looking in the direction of the arrows IIIIII of FIG. 1;
  • FIG. 4 is a bottom view of certain parts as assembled and looking in the direction of the arrow IV of FIG. 3;
  • FIG. 5 is a vertical section taken on the broken line V-V of FIG. 1, assuming the charge to be removed, and the open position of the bolt housing being indicated by dashed line;
  • FIG. 6 is a detail view looking in the direction of arrows VI-VI in FIG. 5 and showing a spring-pressed latch for the bolt housing;
  • FIG. 7 is a view taking on the line VII-VII of FIG. 1;
  • FIG. 8 is a view taken on the line VIII-VIII of FIG. I;
  • FIG. 9 is a view taken along the line IX-IX of FIG. 1;
  • FIG. 10 is a muzzle end view of the tool.
  • FIGS. 1 and 2 the illustrative tool com threaded for securing a tubular hand grip I8.
  • An adapter tube" 20 telescoping over the barrel 12 and the bushing 14 has a compression spring 22 confined therein and abutting an interior shoulder of the grip 18.
  • the tube 20 has an intumed end abutting a retaining ring 24 on the ram guide I6 and is thus connected for joint axial movement with the guide relative to the barrel 12. Accordingly, the arrangement is such that, as indicated in FIG. I, the ram guide 16 and the adapter tube 20 are urged forwardly, i.e.
  • a slightly enlarged rearward end of the ram guide 16 is engaged by a buffer ring 27 disposed in an annular recess in the portion 14.
  • the mouth of the ram guide 16 preferably is internally tapered to frictionally retain a fastener F to be driven, a washer 28 of a relatively short drive pin being shown in this instance engaging the tapered mouth.
  • a ram or piston 30 is desirably moved axially by the force of explosion from ignition of a caseless charge 32 shown in this instance as loaded in a firing chamber received in the breech end of the barrel 12.
  • the piston 30 has a head 34 receivable in a cylindrical portion of the barrel, the head initially closing off axial barrel vents 36 communicating with the firing chamber.
  • the stem of the piston extends forwardly through an enlarged tubular portion 38 of the ram guide and has bearing in the reduced forward portion of the guide I6.
  • the tool is designed to practice what is often termed zero stand off.” This is to say that when a fastener F of any given length, say from I" to 3" is inserted in the muzzle and is in contact with the locality of a work piece P wherein it is to be driven, as shown in FIG. 2, the ram stem abuts the fastener F endwise and the ram head 34, with its O-ring 40, is fully nested in the inner cylindrical portion of the barrel. Seizing the grip 18 with one hand and, against resistance of the spring 22, bringing the muzzle end of the tool with its fastener F to bear with pressure on the work piece P seats the ram 30 as required for ignition of the charge 32 by means hereinafter described.
  • a bolt housing 42 (FIGS. 1, 3 and 5) is mounted to swing, when permitted, about an axis extending parallel to the axis of the barrel 12.
  • the housing 42 is fulcrumed on a hinge pin 44 which also serves in a safety mechanism later to be described.
  • the pin 44 fixedly carries a key 46 and slidably extends axially into a bore formed in the enlarged breech end of the grip 18. In its forward position shown in FIG. 1 the upwardly projecting portion of the key 46 is wholly seated in a longitudinal keyway 48 formed in the wall of the mentioned grip bore, and the bolt housing 42 may swing into breech closed position as shown in FIGS.
  • a 180 circumferential cavity 50 on the housing mating with a 360 flange 52 formed on the barrel 12.
  • the housing 42 slidably holds a bolt '56 an enlarged head 58 of which is formed with a central striker portion 60 arranged to impact the charge 32 centrally.
  • Surrounding annular barrelmating formations 62 of the bolt are adapted to seal the charge in its firing chamber at the instant of ignition thereby insuring that all gases of combustion are expelled through the vents 36 to drive the ram 30 and hence the fastener F.
  • a cap 64 adapted to be struck a hammer blow when the charge is to be exploded is secured to the bolt 56 by means of a retaining pin 66.
  • the bolt 56 is urged away from charge impacting position by a compression spring 68 confined between an end of the bolt housing 42 and an inner recessed end of the cap 64, the bolt head 58 preferably abutting a buffer ring 70.
  • a cap buffer 72 is seated on an inner end of the cap 64.
  • a hollow safety block 74 slidable in a radial slot in the housing 42 and receiving a conical rear end of the hinge pin 44 has a projection 76 interposed between a shoulder 78 of the bolt housing 42 and the cap buffer 72 positively to prevent ignition.
  • the safety block 74 is urged into such locking position by a compression spring 80 one end of which is recessed in the block 74 and having an outer end bearing on a retainer plate 82.
  • This plate is secured to the housing 42 by a retainer pin 84 (FIGS. 1-4), is preferably dovetailed to the housing, and has an inturned forward end rotatably guided in a partly circumferential curve on the grip 18.
  • a grip lever 92 Pivoted on a pin 88 (FIGS. 1, 2 and 9) spanning a longitudinal kerf 90 in the grip 18 is a grip lever 92 which may be actuated by one hand while firmly seizing the grip l8.
  • a safety lever 94 Recessed in a longitudinal slot in the grip lever 92 is a safety lever 94 fulcrumed on a pin 96 secured in the grip lever.
  • a retainer pin 103 in the lever 94 extends in a side recess in the actuator 100 to limit its axial movement. Accordingly, as the grip lever 92 is depressed and pivoted about the pin 88 into the position shown in FIG. 2, the safety lever 94 is immediately rotated about a contact point 104 of the actuator pivot I00 with the adapter tube 20. As a consequence a rear beveled surface 106 of the safety lever 94 engages a front surface 108 of the hinge pin 44 to cam it rearwardly against resistance of the spring 86. Hence a rear cam surface 110 of the hinge pin 44 acts on an internal bevel formed in the safety block 74 to cause it be to disengaged from interference with the cap 64.
  • a spring-pressed latch 112 (FIGS. 5-7) nested in the grip l8 abuts a wall of a conical recess 114 in the housing 42.
  • the bolt 56 may be adapted to receive and hold the charge 32 for impact ignition against the rear face of the barrel 12.
  • the shapes of the confronting faces of the bolt and the barrel would then be interchanged, operation remaining essentially the same.
  • an interchangeable loose-fitting breech plug (not shown) may be removably mounted in the breech end of the barrel l2.
  • the same ram 30 may be used.
  • This advantageous feature is due to the fact that when the shortest fastener F is in the muzzle in ready-to-fire condition as shown in FIG. 2, the adapter tube 20 is most fully retracted relatively to the ram 30, and the ram guide 16 is then also fully telescoped toward the breech end.
  • the adapter tube 20 will be axially retracted a lesser distance relative to the barrel to seat the ram head 34 therein.
  • the ram guide 16 can, as indicated in FIG.
  • a barrel a bolt yieldingly cooperative with the breech end of the barrel to impact ignite a charge, one of the bolt and the barrel breech end being adapted to receive and hold the charge until its gases of combustion exhaust into the barrel, a grip connected to the barrel, a tubular member coaxially telescoped in the grip and yieldingly urged to project muzzleward for engagement with a work piece, a bolt housing hinged on the grip and slidably carrying the bolt into and out of operative sealing relation to the breech end of the barrel when the housing is in breech-closed relation to the barrel, interlock means r'novably mounted in the housing for preventing relative movement together of the bolt and the barrel, and manually operable safety means movably mounted in the grip and effectively operable to render the interlock means inoperative only when the tubular member is forced against the work piece by relative movement of the grip and said member.
  • a tool as set forth in claim 4 wherein the safety means comprises a grip lever pivoted on the grip, and a safety lever pivoted on the grip lever, the safety lever having at one end cam engagement with the hinge pin and at the other end a pivot actuator, the arrangement being such that said pivot actuator only has operative engagement with a wall of the tool to displace the hinge pin when said tubular member forcibly engages the work piece.
  • interlock means includes a safety block spring biased into interference position and having a cam surface arranged to be engaged by the hinge pin to displace the block from said position in response to actuation of the grip lever in the grip.
  • an explosively actuated fastener driving tool of the type having a barrel provided with a fastener driving ram and a bolt slidable in a bolt housing closeable on the barrel to cooperate with the barrel in impact igniting an explosive charge between the ram and the bolt, a tubular ram guide axially telescoped in the barrel and having a forwardly projecting muzzle end for receiving different lengths of the respective fasteners to be driven into a work piece, an adapter tube telescoped on the barrel and yieldingly urged forwardly thereof, the ram guide and the adapter tube being connected for joint axial movement relative to the barrel and independently of the ram, an element movably mounted in the housing between a first position wherein the bolt and barrel are prevented from cooperating and a second position wherein they can cooperate when the housing is closed on the barrel, and a safety control mechanism including a pivot actuator and effectively operable manually to shift said element to its second position only when the adapter tube is sufficiently retracted relative to the barrel by engagement of the ram guide with the work
  • the safety control mechanism includes a grip connected to the barrel, a lever pivotally mounted in the grip, a safety lever pivoted to the grip lever and carrying said pivot actuator, and cam means operable by the safety lever for controlling the movement of the element.
  • cam means includes a hinge pin on which said housing may be turned between breech-open and breech-closed positions relative to the barrel.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US832751A 1969-06-12 1969-06-12 Hammer ignition explosive tools with safety means Expired - Lifetime US3558032A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US83275169A 1969-06-12 1969-06-12

Publications (1)

Publication Number Publication Date
US3558032A true US3558032A (en) 1971-01-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US832751A Expired - Lifetime US3558032A (en) 1969-06-12 1969-06-12 Hammer ignition explosive tools with safety means

Country Status (5)

Country Link
US (1) US3558032A (de)
CH (1) CH510496A (de)
DE (1) DE2028142C3 (de)
ES (1) ES381130A1 (de)
FR (1) FR2046723B1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US4037770A (en) * 1975-06-27 1977-07-26 Olin Corporation Tool using caseless ammunition
US4252259A (en) * 1979-05-29 1981-02-24 Brosius Bros., Inc. Hammer drive tool
US4565312A (en) * 1985-02-19 1986-01-21 Uniset Corporation Powder actuated tool with safety
US5799855A (en) * 1996-02-09 1998-09-01 Illinois Tool Works Inc. Velocity control and nosepiece stabilizer system for combustion powered tools
US6454151B1 (en) * 2000-07-17 2002-09-24 Lin Wang-Kuan Power stapler
US20040094595A1 (en) * 2002-08-08 2004-05-20 Markus Sprenger Setting tool
US12083660B1 (en) * 2021-03-26 2024-09-10 Altenloh, Brinck & Co. Us, Inc. Washer holder adaptor for fastener guns

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3563439A (en) * 1968-06-18 1971-02-16 Omark Industries Inc Powder actuated tool

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3075197A (en) * 1961-01-18 1963-01-29 Speed Fastener Inc Powder actuated tool

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3075197A (en) * 1961-01-18 1963-01-29 Speed Fastener Inc Powder actuated tool

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US4037770A (en) * 1975-06-27 1977-07-26 Olin Corporation Tool using caseless ammunition
US4252259A (en) * 1979-05-29 1981-02-24 Brosius Bros., Inc. Hammer drive tool
US4565312A (en) * 1985-02-19 1986-01-21 Uniset Corporation Powder actuated tool with safety
US5799855A (en) * 1996-02-09 1998-09-01 Illinois Tool Works Inc. Velocity control and nosepiece stabilizer system for combustion powered tools
US5897043A (en) * 1996-02-09 1999-04-27 Illinois Tool Works Inc. Velocity control and nosepiece stabilizer system for combustion powered tools
US6454151B1 (en) * 2000-07-17 2002-09-24 Lin Wang-Kuan Power stapler
US20040094595A1 (en) * 2002-08-08 2004-05-20 Markus Sprenger Setting tool
US6824034B2 (en) * 2002-08-08 2004-11-30 Hilti Aktiengesellschaft Setting tool
US12083660B1 (en) * 2021-03-26 2024-09-10 Altenloh, Brinck & Co. Us, Inc. Washer holder adaptor for fastener guns

Also Published As

Publication number Publication date
CH510496A (de) 1971-07-31
ES381130A1 (es) 1972-11-16
DE2028142A1 (de) 1971-01-21
DE2028142B2 (de) 1973-03-29
FR2046723B1 (de) 1973-01-12
DE2028142C3 (de) 1975-06-12
FR2046723A1 (de) 1971-03-12

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