EP3197642B1 - Appareil d'enfoncement à ressort à gaz - Google Patents

Appareil d'enfoncement à ressort à gaz Download PDF

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Publication number
EP3197642B1
EP3197642B1 EP15766836.9A EP15766836A EP3197642B1 EP 3197642 B1 EP3197642 B1 EP 3197642B1 EP 15766836 A EP15766836 A EP 15766836A EP 3197642 B1 EP3197642 B1 EP 3197642B1
Authority
EP
European Patent Office
Prior art keywords
piston rod
driving
piston
piston head
head
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.)
Active
Application number
EP15766836.9A
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German (de)
English (en)
Other versions
EP3197642A1 (fr
Inventor
Iwan Wolf
Mario Grazioli
Karl Franz
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
Publication of EP3197642A1 publication Critical patent/EP3197642A1/fr
Application granted granted Critical
Publication of EP3197642B1 publication Critical patent/EP3197642B1/fr
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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
    • B25C1/04—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure
    • B25C1/047—Mechanical details
    • 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
    • B25C1/06—Hand-held nailing tools; Nail feeding devices operated by electric power

Definitions

  • the invention relates to a tacker, in particular a hand-held tacker, according to the preamble of claim 1.
  • WO 2009/046076 A1 describes a driving tool for driving a nail into a workpiece in which a gas spring is biased by an electric motor to drive in a setting piston.
  • a piston member of the gas spring is connected via a hinge joint with a substantially strip-shaped piston rod, so that an angle compensation between piston member and piston rod can be done only in one plane.
  • the loading of the hinge joint in the region of a hinge pin means a limitation of the transferable forces and thus the driving energy.
  • the piston head is usually guided in a cylinder.
  • the piston rod regularly has a considerably smaller diameter than the piston head. It can act within the meaning of the invention directly as setting piston by a nail-side end of the piston rod is formed accordingly.
  • the setting piston can also be designed as a component which is movable separately from the piston rod or as a separate component, but which is firmly connected to the piston rod.
  • the thrust bearing in the sense of the invention absorbs forces acting in the driving direction and transmits them to the piston rod. Other directed forces need not necessarily be transferable from the thrust bearing.
  • the thrust bearing preferably comprises a pair of each about a central axis of the piston head rotationally symmetrical pressing surfaces.
  • the one pressing surface is expediently formed on the piston head and the other pressing surface is formed on the piston rod.
  • the pressing surfaces in the region of your system have different radii of curvature from each other.
  • the pivoting of the thrust bearing to compensate for slants is particularly smooth.
  • one of the pressing surfaces, in particular the pressing surface of the piston rod is convex.
  • the other pressing surface may be correspondingly concave with a larger radius of curvature or even plan formed.
  • the pressing surfaces in the area of your system have the same radii of curvature. This can for example be in the formation of the thrust bearing as a ball joint. In such an embodiment, a particularly large contact of the pressing surfaces with correspondingly good power transmission is present.
  • Such an embodiment also includes planar pressing surfaces, wherein a corresponding compensation of a skew is achieved by elastic deformation of a correspondingly selected material of the piston head and / or piston rod.
  • At least one of the pressing surfaces is formed on an insert part, which is fixed to one of the two, piston head or piston rod.
  • the insert part for example, consist of a particularly hard material such as steel and transmit the forces occurring over a relatively small area contact.
  • the rest of the component, in particular the piston head may be made of a softer material such as plastic or aluminum.
  • the piston head of a material having a density of less than 3.5 g / cm 3
  • the piston rod may be made of a material having a density greater than 3.5 g / cm 3 .
  • the piston rod is made of a metal, in particular a steel. This allows the absorption of large impulses and the transmission of high energies to a nail member.
  • the piston head may be made of a softer material such as plastic or a light metal.
  • a radially inwardly directed, in particular curved edge is formed on the piston head, by means of which the piston rod is guided by the piston head in the radial direction.
  • Such a leadership of the piston rod is durable and works in a simple way with the thrust bearing.
  • an inlet bevel can be provided, by means of which the piston rod is centered on an axis of the piston head.
  • the piston rod is not connected in the driving direction with the piston head. This allows a free advance or lifting the piston rod in the drive direction, whereby the piston head is particularly spared, for example in the case of empty shots.
  • a non-uniform material structural part is fixed on the piston rod, by means of which the piston rod can be coupled to the electric motor.
  • the separate formation of the structural part allows a simple, for example rotationally symmetrical shaping of the piston rod, which gives advantages in particular at high material densities and material hardnesses of the piston rod.
  • the structural part is formed as a casting on the piston rod.
  • the piston rod may consist of a steel or other high-strength metal, wherein the structural part is cast as a plastic casting or as a light-metal casting on the piston rod.
  • the piston rod comprises a ball head as part of the thrust bearing. This allows a particularly large power transmission.
  • the piston rod is connected via an elastic snap connection with the piston head. This allows a simple Swiveling the piston rod by small angles due to the elasticity of the snap connection.
  • the piston rod is connected via a flexurally elastic plastic with the piston head.
  • a plastic may for example be molded to achieve a permanent positive connection of the piston rod to the piston head.
  • the elasticity of the plastic allows sufficient pivoting of the piston rod in several levels.
  • the plastic may preferably be a thermoplastic elastomer (TPE) of correspondingly optimized hardness.
  • a drive-in device is designed for high drive-in energies.
  • the drive-in energies can exceed values of 30 joules, preferably 40 joules.
  • FIG. 1 An inventive tacker is according to Fig. 1 received in a hand-held housing 1.
  • the housing 1 has a handle 1a with a trigger 1b for triggering a driving operation.
  • an accumulator 2 for storing electrical energy, an electronic control unit 3 and a safety sensor 4 for the secure release of a driving operation are provided.
  • each a nail is loaded into a mouth part 6 of the tacker. From this position, the nail is driven by impact of a setting piston 7 in a workpiece.
  • the setting piston 7 is designed as a front end of a piston rod 8 in the driving direction.
  • the piston rod 8 abuts at its rear end via a thrust bearing 9 on a piston head 10.
  • the piston head 10 is guided as a movable part of a gas spring 11 in a cylinder 12 and sealed by circumferential seals 13 pressure-tight.
  • the gas spring 11 is also in a maximum relaxed state ( Fig. 1 ) permanently filled with a gas under pressure to increase the energy consumption per stroke or the spring constant.
  • the gas spring is tensioned by the piston rod 8 is moved by means of an electric motor 14 counter to the driving direction.
  • a structure 15 is formed on the piston rod 8, which meshes with a rotating output member 16 of the electric motor 14 and thus forms a total of a tensioning mechanism.
  • the structure 15 has substantially the form and function of a rack.
  • Other parts of the tensioning mechanism may include, for example, a holding member, by means of which the tensioned gas spring can be triggered (not shown).
  • Fig. 1 The representation after Fig. 1 is purely schematic.
  • the combination of piston rod 8 and piston head 10 is formed in a special way, wherein the thrust bearing 9 allows a small pivoting of the piston rod 8 in several planes relative to the piston head 10.
  • the pivoting can be done in any direction.
  • various solutions and detailed designs are proposed, which are explained in more detail below.
  • the pressure bearing 9 is formed by means of two pressing surfaces 9a, 9b, which are pressed against each other at least during acceleration of the piston rod.
  • the pressing surfaces are rotationally symmetrical about a central axis Z extended in the driving direction.
  • the first pressing surface 9 a is formed as a substantially flat surface (infinite radius of curvature) on an end face of the piston head 10.
  • Fig. 2 it consists of the material of the piston head, in this case a plastic.
  • the second pressing surface 9b is formed as a convex surface (positive radius of curvature) at a mushroom-shaped rear end of the piston rod 8.
  • the pressing surfaces 9a, 9b therefore have different radii of curvature in the region of their abutment. The surfaces therefore only touch one another in a geometrical manner.
  • the actual contact area of the pressing surfaces is obviously larger, the size depending on the hardness of the sheet materials and the magnitude of the pressing force.
  • the piston rings are made of steel in order to be able to transfer large set energies of more than 40 joules to the nail.
  • a radially inwardly directed outer edge 17 is stepped, by means of which, at least during the installation of the pressing surfaces 9a, 9b, the rear, mushroom-shaped end of the piston rod 8 is guided in the radial direction.
  • the edge 17 also has a chamfer, by means of which the piston rod 8 is guided self-centering, if in the course of Eintreibvorgangs a release of the piston rod 8 takes place from the piston head 10.
  • Fig. 3 shows a further development of the example Fig. 2 , The only difference here is the pressing surface 9a formed on the side of the piston head 10 on an insert part 18 which is inserted into the end face of the piston head 10 and consists of a high-strength material such as steel. This allows a wear-free and low-friction transmission of high acceleration forces.
  • the remaining piston head 10 is made of a softer and lighter material such as plastic or light metal.
  • Structure 15 is shown in the examples Fig. 2 and Fig. 3 formed as a series of recesses, which are introduced into the steel piston rod 8.
  • the structure 15 has been sprayed onto a steel core of the piston rod 8 as a structural part made of plastic.
  • the piston rod 8 has a taper, by means of which the plastic of the structural part 15 is held in a form-fitting manner.
  • Fig. 5 shows a development of the example Fig. 4 wherein the structural member 15 has teeth for mating on at least two opposite sides. As a result, a particularly large adhesion can be realized.
  • the teeth are formed only on one side of the piston rod.
  • Fig. 6 shows a further embodiment of the invention.
  • the piston rod 8 is connected via a ball head 19 with the piston head 10.
  • the convex ball head 19 engages in a corresponding, formed on the piston head 10 ball socket 20 with the same radius of curvature. Accordingly, the pressing surfaces 9a, 9b are particularly large.
  • the ball joint may be closed or open. Accordingly, the piston rod can be held positively in the pulling direction or be movable away in the pulling direction of the piston head away.
  • the piston rod 8 is pivotable in each plane by an angle W relative to the piston head 10.
  • the angle W is exaggerated.
  • typical swivel angle to compensate for tolerances are usually less than a 1 degree.
  • the seal 13 of the piston head is in Fig. 6 shown as a construction of three rings.
  • a front in the driving direction ring is designed as a scraper ring, a middle ring is formed as oil-impregnated felt ring and a rear ring is formed as a pressure-tight seal.
  • Fig. 7 shows a variant in which the piston rod 8 has a circumferential bead 21 which is held by a resilient, circumferential locking ring 21 positively in the driving direction.
  • the piston rod is thereby connected in the manner of a snap connection with the piston head 10, so that a force can also be transmitted in the pulling direction.
  • the pressing surfaces 9a, 9b are each made flat, wherein a pivoting in all planes is achieved by the elasticity of the piston material or at least the material of the snap ring 22.
  • Fig. 8 indicates one Fig. 7 similar example in which instead of the snap ring, a front part of the piston head 10 as a ring 23 of a flexurally elastic plastic, in the present case a thermoplastic elastomer, is integrally formed.
  • the piston rod 8 is permanently connected in a form-fitting manner with the piston head, so that a force transmission in the pulling direction is also provided here.
  • the ring 23 can be formed, for example, by an injection molding on the piston head 10 and piston rod 8. The pivoting of the piston rod 8 in all planes is given above all by the elasticity of the ring 23.
  • At least one of the pressing surfaces 9a, 9b of the examples FIGS. 7 and 8 may have a convex curvature.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Compressor (AREA)
  • Actuator (AREA)

Claims (13)

  1. Appareil d'enfoncement comportant :
    un moteur rotatif (14), en particulier un moteur électrique,
    un ressort à gaz (11) ayant un volume de gaz élastiquement comprimable, et
    un piston de pose (8),
    dans lequel le ressort à gaz (11) peut être sollicité par le moteur (14) par l'intermédiaire d'un mécanisme de contrainte (15, 16), afin d'accélérer le piston de pose (8) dans une direction d'enfoncement après une libération à partir de l'état contraint,
    dans lequel le ressort à gaz (11) comprend une tête de piston (10) guidée de manière étanche aux gaz et adjacente à une tige de piston (8) dans la direction d'enfoncement comme un composant séparé,
    caractérisé en ce que
    la tige de piston (8) est reliée à la tête de piston (10) par l'intermédiaire d'un palier de butée (9) pouvant pivoter dans plusieurs plans.
  2. Appareil d'enfoncement selon la revendication 1, caractérisé en ce que le palier de butée (9) comporte une paire de surfaces de pression (9a, 9b) ayant respectivement une symétrie de rotation autour d'un axe central (Z) de la tête de piston (10).
  3. Appareil d'enfoncement selon la revendication 2, caractérisé en ce que les surfaces de pression (9a, 9b) ont des rayons de courbure différents l'un de l'autre dans leur zone de contact.
  4. Appareil d'enfoncement selon la revendication 2, caractérisé en ce que les surfaces de pression (9z, 9b) ont des rayons de courbure identiques dans leur zone de contact.
  5. Dispositif d'enfoncement selon l'une des revendications 2 à 4, caractérisé en ce qu'au moins une des surfaces de pression (9a, 9b) est formée sur une partie d'insert (18) qui est fixée sur l'un des deux éléments, à savoir la tête de piston (10) ou la tige de piston (8).
  6. Dispositif d'enfoncement selon l'une des revendications précédentes, caractérisé en ce que la tige piston (8) est constituée d'un métal, en particulier d'un acier.
  7. Dispositif d'enfoncement selon l'une des revendications précédentes, caractérisé en ce qu'un rebord en particulier incurvé et dirigé radialement vers l'intérieur (17) est formé sur la tête de piston (10), au moyen duquel la tige de piston (8) est guidée dans une direction radiale par la tête de piston (10).
  8. Dispositif d'enfoncement selon l'une des revendications précédentes, caractérisé en ce que la tige de piston (8) n'est pas reliée à la tête de piston (10) dans la direction d'enfoncement.
  9. Dispositif d'enfoncement selon l'une des revendications précédentes, caractérisé en ce qu'une partie de structure en matériau non uniforme (15) est fixée sur la tige de piston (8), au moyen de laquelle la tige de piston (8) peut être couplée au moteur électrique (14).
  10. Dispositif d'enfoncement selon la revendication 9, caractérisé en ce que la partie de structure (15) est formée sur la tige de piston (8) comme une pièce moulée.
  11. Dispositif d'enfoncement selon l'une des revendications précédentes, caractérisé en ce que la tige de piston (8) comporte une tête sphérique (19) en tant que partie du palier de butée (9).
  12. Dispositif d'enfoncement selon l'une des revendications précédentes, caractérisé en ce que la tige de piston (8) est reliée à la tête de piston (10) par une liaison à encliquetage élastique (21, 22).
  13. Dispositif d'enfoncement selon l'une des revendications précédentes, caractérisé en ce que la tige de piston (8) est reliée à la tête de piston (10) par une matière plastique élastique en flexion (23).
EP15766836.9A 2014-09-25 2015-09-22 Appareil d'enfoncement à ressort à gaz Active EP3197642B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14186424.9A EP3000560A1 (fr) 2014-09-25 2014-09-25 Appareil d'enfoncement à ressort à gaz
PCT/EP2015/071693 WO2016046188A1 (fr) 2014-09-25 2015-09-22 Appareil d'enfoncement muni d'un ressort à gaz

Publications (2)

Publication Number Publication Date
EP3197642A1 EP3197642A1 (fr) 2017-08-02
EP3197642B1 true EP3197642B1 (fr) 2018-09-19

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP14186424.9A Withdrawn EP3000560A1 (fr) 2014-09-25 2014-09-25 Appareil d'enfoncement à ressort à gaz
EP15766836.9A Active EP3197642B1 (fr) 2014-09-25 2015-09-22 Appareil d'enfoncement à ressort à gaz

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EP14186424.9A Withdrawn EP3000560A1 (fr) 2014-09-25 2014-09-25 Appareil d'enfoncement à ressort à gaz

Country Status (7)

Country Link
US (1) US20170282341A1 (fr)
EP (2) EP3000560A1 (fr)
JP (1) JP6373491B2 (fr)
CN (1) CN106715981A (fr)
ES (1) ES2693331T3 (fr)
TW (1) TWI602664B (fr)
WO (1) WO2016046188A1 (fr)

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Publication number Publication date
ES2693331T3 (es) 2018-12-11
WO2016046188A1 (fr) 2016-03-31
EP3000560A1 (fr) 2016-03-30
EP3197642A1 (fr) 2017-08-02
US20170282341A1 (en) 2017-10-05
TWI602664B (zh) 2017-10-21
JP6373491B2 (ja) 2018-08-15
TW201615360A (zh) 2016-05-01
JP2017528331A (ja) 2017-09-28
CN106715981A (zh) 2017-05-24

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