EP2886255A1 - Appareil d'enfoncement - Google Patents

Appareil d'enfoncement Download PDF

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Publication number
EP2886255A1
EP2886255A1 EP13197905.6A EP13197905A EP2886255A1 EP 2886255 A1 EP2886255 A1 EP 2886255A1 EP 13197905 A EP13197905 A EP 13197905A EP 2886255 A1 EP2886255 A1 EP 2886255A1
Authority
EP
European Patent Office
Prior art keywords
piston member
combustion chamber
side guide
piston
punch
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Withdrawn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
EP13197905.6A
Other languages
German (de)
English (en)
Inventor
Harald Fielitz
Peter Roth
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Priority to EP13197905.6A priority Critical patent/EP2886255A1/fr
Publication of EP2886255A1 publication Critical patent/EP2886255A1/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Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to a tacker according to the preamble of claim 1.
  • Hand-held driving devices with propellant charge are known from the prior art, in which after ignition of a pyrotechnic charge, the resulting fuel gases expand in a combustion chamber. As a result, a piston is accelerated as energy transfer means and drives a fastener into a workpiece.
  • the pistons of such pyrotechnic driving devices are designed as bodies of revolution about a central axis.
  • the piston may be shaped such that a portion of the piston having a larger outer diameter than the fastener sweeps an initial position of the fastener in its axial travel.
  • An exit-side guide is a guide in which the fastener is inserted before the driving operation in a starting position.
  • the recess in the guide member overlaps in radial projection with at least one rear end of a fastening member in its initial position. It is from assumed a fastening member which is inserted maximally to the rear in the guide.
  • the term “rear” is understood in each case opposite to the driving direction and "forward" in the driving direction.
  • a piston member according to the invention is any means which is acted upon by the ignition of the charge with kinetic energy, wherein the kinetic energy is ultimately transferred to the fastening means.
  • any retractable anchoring such as nail, bolt or screw understood.
  • the guide channel for receiving and guiding the fastener has apart from the recess circular cross-section.
  • Piston members according to the invention are preferred, but not necessarily made of metal, in order to take into account the high energies and temperatures when using pyrotechnic charges.
  • the piston member at least over a portion in the axial direction an inner punch and a plurality of axially extending, radially projecting beyond the punch webs, wherein the punch can engage in the exit-side guide channel.
  • the piston member is supported by means of the radially projecting webs on the combustion chamber side guide. This allows overall effective guidance of the piston member in a short and compact design.
  • the section opens with the radially projecting webs in the combustion chamber. This requires a corresponding non-circular cross section of the pressurized surface of the piston member, whereby a particularly short construction of the piston member is made possible.
  • the piston member has a combustion chamber side portion with a circular cross-section. This allows a simple and effective sealing of the piston member with respect to the combustion chamber, for example by means of annular projections. At the same time, the section with a circular cross-section can be kept particularly short, as a result of the radially projecting webs Good combustion chamber side guidance is achieved. Overall, this can be used a light and short piston member.
  • a transition region with an increasing diameter of the punch is provided between the section with a circular cross section and the section with the radially projecting webs.
  • a section may expediently act as a stop or piston brake, in order, for example, in the case of a blank shot to avoid a destructive impact of the piston.
  • an elastic stop member which is formed according to the transition region, be arranged at a front end of the piston stroke.
  • the piston member has a radially projecting beyond the webs pin for the return movement of the piston member.
  • a pin can run in a slot of a side wall of the piston guide and supported against a spring or connected to another return mechanism.
  • a central axis of the exit-side guide channel and a central axis of the combustion chamber-side guide are offset parallel to one another.
  • a compact and short tacker can be realized by such a construction.
  • the piston member has a combustion chamber-side piston part and a stamper offset parallel thereto, the piston being rigidly connected via a connecting web to the combustion chamber-side piston part.
  • the connecting web can thereby at least partially engage in the recess of the outlet-side guide member, whereby a short overall length of the piston member can be achieved.
  • the stamp can be arranged above, below or also laterally of the combustion chamber-side piston part.
  • the stamp can be arranged above, below or also laterally of the combustion chamber-side piston part.
  • To optimize the design of the parallel offset of the axes is regularly greater than the sum of the radii of the combustion chamber side piston part and the punch.
  • a drive-in device comprises a hand-guided housing 1, in which a power transmission element in the form of a piston member 2 is accommodated.
  • a surface 2a of the piston member 2 defines a combustion chamber 3 in which the combustion gases of a pyrotechnic charge expand to accelerate the piston member 2.
  • the charge is presently received in a cartridge 1a made of sheet metal.
  • the cartridge has an impact fuze and is inserted into a cartridge bearing 1b before ignition via a corresponding loading mechanism.
  • the punch 5 is presently designed as a radially inner central region of the piston member 2, wherein of the punch 5 a plurality of radially projecting and axially extending webs 6 go out.
  • the present four webs 6 abut with their radial outer surfaces 6a on the inner wall of a combustion chamber-side guide 3a.
  • the stamp with the radially projecting webs here essentially has the shape of a splined shaft.
  • the combustion chamber-side guide 3a in the present example has no circular cross section, but corresponds in its cross section to the outline of the piston member 2 according to the plan view Fig. 3 , As a result, the piston member 2 of the first embodiment is sealed against the gas pressure. To improve the seal, the surfaces 6a of the webs 6 of the piston member 2 have precisely machined sealing surfaces 6b in the rear region, which protrude radially by a slight excess.
  • the fastening element 4 is received in an outlet-side guide member 7 in a front mouth region of the tacker.
  • the fastening element 4 bears against a circumference of the fastening element 4 in a guide channel 7a of the guide member 7.
  • the fastening element 4 is accelerated in the direction of the workpiece when the punch 5 of the piston member 2 strikes a rear end of the fastening element 4.
  • the fastener is shown in an intermediate position in the course of this acceleration.
  • a front guide collar 4a of the fastening element 4 has already emerged from the guide channel 7a, while a rear guide collar 4b is still within the guide channel 7a.
  • the outlet-side guide member 7 and the combustion chamber side guide 3a are in the present example after Fig. 1 to Fig. 4 formed as a continuous, unified leadership. Therefore, the cross section of the exit-side guide in its open cross-section corresponds to the outline of the piston member 2 in plan view Fig. 3 ,
  • the inner, circumscribed by a circle part of the exit-side guide member 7 corresponds to the cylindrical guide channel 7a, which is broken by four axially extending recesses 7b.
  • the recesses 7b serve to guide the radially projecting webs 6.
  • the webs 6 serve both the outlet side and the combustion chamber side guide of the piston member. 2
  • the piston member 2 can be designed to be very short.
  • a short, front part 8 of the punch 5 is formed freestanding and without radially projecting webs 6. This shape is formed depending on the requirements for length, weight and guiding properties of the piston member 2.
  • combustion chamber-side guide 3, the outlet-side guide member 7 and the piston member 2 have a common, central axis A.
  • the second embodiment according to Fig. 5 to Fig. 6 differs from the example described above in that the combustion chamber side guide 3a has a circular cross-section in a conventional manner.
  • the combustion chamber 3 is thus predominantly designed as a cylindrically shaped space.
  • the piston member 2 has a rear, combustion chamber side portion 9 with a circular cross-section.
  • This section 9 is guided in the combustion chamber-side guide 3a and can be sealed in a conventional manner against the wall of the combustion chamber 3. This can be done by a number of integrally formed sealing beads (not shown), at the same time to minimize the friction of the cylindrical portion.
  • the portion 9 has a step 9a, which is fitted dimensionally accurate in a corresponding gradation 10 in the combustion chamber 3. This optimizes the first part of the acceleration process.
  • a front portion 11 of the piston member 2 is like the piston member of the first embodiment provided with a plurality (in the present four) radially projecting webs 6. This section 11 can enter into the exit-side guide channel 7a and its recesses 7b as in the example explained above.
  • this section 11 is also guided in the rear, combustion chamber-side guide 3a, since the webs 6 have a same diameter to the cylindrical portion 9 and the combustion chamber.
  • a very effective guidance of the piston member can be ensured in a simple manner.
  • the rear, cylindrical section 9 are structurally just kept so short that an adequate seal of the combustion chamber is given. This can save overall length and weight in the design of the piston member 2.
  • a transition region 12 is arranged between the rear portion 9 of circular cross section and the front portion 11 with radially projecting webs.
  • the diameter of the punch 5 increases in the region between the webs 6 in the manner of a ramp.
  • the rise over a concavely curved course is continuously up to the outer diameter of the rear portion 9.
  • This transition region 12 may serve as part of a piston brake.
  • deformable or energy-absorbing elements are provided in the front region of the guide (not shown). In the case of empty shots, excessive charge or the like, the piston member 2 bounces against the ramps of the transition region 12 against these elements, so that the considerable kinetic energy is dissipated as non-destructively as possible.
  • Such elements may be designed to be consumed after one or more idle shots.
  • a pin 6c projects radially beyond the outer circumference of the webs 6.
  • the piston member 2 can be reset by means of a return mechanism. If necessary, such a pin 6c can also be provided on the piston member of the first embodiment.
  • the arrangement of the piston member 2 in the guides 3a, 7 is in Fig. 6 shown.
  • the rear combustion chamber side guide 3a has a circular cross section.
  • the front, outlet-side guide member 7 is presently arranged in a front segment 15 of three component segments 13, 14, 15 and corresponds in its cross section to the outlet-side guide member 7 of the first embodiment.
  • a third embodiment of the invention according to FIGS. 7 to 9 are, unlike in the previous examples, a central axis B of the guide channel 7a and a central axis A of the combustion chamber 3 offset from each other in parallel.
  • a piston part 16 of the piston member 2 is guided in the combustion chamber side guide 3a and the punch 5 is guided in an outlet-side guide member 7, which is offset parallel to the combustion chamber side guide 3a.
  • the punch 5 is rigidly connected to the piston part 16 via a connecting web 17.
  • the connecting web 17 is formed as a flat, dimensionally stable portion which extends in a plane with the axes of the guides 3 a, 7.
  • the lateral offset of the axes A, B of the guides 3a, 7 is greater than the sum of the radii of the two guides 3a, 7.
  • Both guides 3a, 7 have a circular cross-section.
  • the exit-side guide member 7 has a recess 7b, which in the present case is designed as a slot. The slot starts at a rear end of the guide channel 7 and ends just before a front end of the guide channel 7a.
  • the flat connecting web 17 can enter into the recess 7b in the course of the piston movement (see Fig. 9 ), whereby a short and compact construction of the piston member 2 is made possible.
  • the combustion chamber-side piston member part 16 has a rear end portion 16a and a front end portion 16b each having the diameter of the combustion chamber side guide 3a.
  • the rear end portion 16a includes annular sealing beads to provide a good seal of the gas pressure in the combustion chamber.
  • the area between the end portions 16a, 16b has a smaller diameter than the end portions to save weight and friction.
  • An arrangement for retrieving the piston member 2 can be arranged in this embodiment in the combustion chamber-side guide, for example, in front of the piston part 16. Also, a piston brake can be provided in a simple manner.
  • openings or valves are provided in a known manner to vent the combustion gases after acceleration of the piston member 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
EP13197905.6A 2013-12-18 2013-12-18 Appareil d'enfoncement Withdrawn EP2886255A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13197905.6A EP2886255A1 (fr) 2013-12-18 2013-12-18 Appareil d'enfoncement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13197905.6A EP2886255A1 (fr) 2013-12-18 2013-12-18 Appareil d'enfoncement

Publications (1)

Publication Number Publication Date
EP2886255A1 true EP2886255A1 (fr) 2015-06-24

Family

ID=49816865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13197905.6A Withdrawn EP2886255A1 (fr) 2013-12-18 2013-12-18 Appareil d'enfoncement

Country Status (1)

Country Link
EP (1) EP2886255A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109648526A (zh) * 2019-01-11 2019-04-19 四川理工学院 射钉器动力缸

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3686858A (en) * 1969-11-05 1972-08-29 Pierre Termet Cartridge actuated two part ram
US3774293A (en) * 1971-09-13 1973-11-27 Signode Corp Fastener driving tool
US4890778A (en) * 1988-04-29 1990-01-02 Hawkins Robert E Hammer-activated fastener tool for driving fastener projectiles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3686858A (en) * 1969-11-05 1972-08-29 Pierre Termet Cartridge actuated two part ram
US3774293A (en) * 1971-09-13 1973-11-27 Signode Corp Fastener driving tool
US4890778A (en) * 1988-04-29 1990-01-02 Hawkins Robert E Hammer-activated fastener tool for driving fastener projectiles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109648526A (zh) * 2019-01-11 2019-04-19 四川理工学院 射钉器动力缸

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