EP3323561A1 - Setting device and method for operating same - Google Patents

Abstract

The invention relates to a flywheel-driven setting tool (1) for driving fastening elements (24) into a substrate, having a driving element (20) drivable in a setting direction by a flywheel (13), which has a connecting region (40) in which the driving element ( 20) for transmitting a driving force from the flywheel (13) to the driving element (20) with the flywheel (13) is connectable. In order to increase the efficiency in driving fasteners into a ground, with the setting tool (1), the connecting portion (40) of the driving element (20) comprises at least one frictionally engaging portion (41) for frictional engagement and at least one interlock connecting portion (42) Representation of a positive connection between the flywheel (13) and the driving element (20).

Description

Technical area

The invention relates to a flywheel-driven setting tool for driving fasteners into a ground, with a drive in a setting direction by a flywheel driving element having a connection region in which the driving element for transmitting a driving force from the flywheel to the driving element with the flywheel is connectable. The invention further relates to a method for operating such a setting device.

State of the art

From the European publications EP 2 716 409 A2 . EP 2 711 135 A2 and EP 2 433 752 A2 Various setting tools are known which generate a frictional connection between a piston and a flywheel during a setting process in order to transmit rotational energy of the flywheel to the piston. From the American disclosure US 2009/0032566 A1 a setting device with a transmission mechanism is known which comprises a toothing between a rotating gear and a setting piston.

Presentation of the invention

The object of the invention is the efficiency of driving fasteners into a ground, with a setting device with a drive in a setting direction by flywheel driving element having a connection region in which the driving element for transmitting a driving force from the flywheel to the driving element with the Flywheel is connectable, increase.

The object is in a flywheel-driven setting tool for driving fasteners into a ground, with a drive in a setting direction by a flywheel driving element having a connection region in which the driving element for transmitting a driving force from the flywheel to the driving element with the flywheel is connectable , in that the connecting region of the driving element comprises at least one frictionally engaging connecting section for frictional engagement and at least one interlocking connecting section for depicting a positive connection between the flywheel and the driving element. The flywheel-driven setting tool is preferably a hand-held setting tool, which is also referred to as a setting tool. The fasteners are, for example, nails or bolts, which are driven into the ground with the aid of the setting device, which is also referred to as a setting tool. The set energy is advantageously provided by an electric motor and transmitted via the flywheel to the driving element, which is also referred to as setting piston. For this purpose, the flywheel is rotated by the electric motor. The rotational energy of the flywheel is for a setting process on the driving element, in particular the setting piston, which is also abbreviated as piston, transmitted. With the help of the driving element, in particular of the piston, the fastener is driven into the ground. For transmitting the rotational energy from the flywheel to the drive-in element, the flywheel, for example by means of a suitable coupling device, is initially connected in a frictional engagement with the drive-in element. For this purpose, the driving element between the flywheel and a counter-roller can be arranged. In conventional setting tools, it has proven in operation to be disadvantageous that is destroyed by an undesirable slip, which may occur during the driving, energy in the form of friction. As a result, the efficiency of the setting device is reduced. In addition, the driving of fasteners into hard surfaces is made difficult by the slip occurring, possibly prevented. Therefore, the driving element translationally moving in the setting tool is additionally connected in a form-fitting manner to the flywheel, in particular after cancellation of the frictional connection, in order to ensure a slip-free power transmission. The flywheel is preferably connected directly to the driving element. But it is also possible to arrange at least one further power transmission between the flywheel and the driving element. By initially frictionally engaged and then positively locking connection between the flywheel and the driving element during the driving operation is advantageously ensured that no or very little slip occurs. As a result, the efficiency of the setting device, especially when settling on a hard surface, can be significantly improved. The function of the power transmission takes place separately with each setting in two ways. After a setting operation, the driving element is released from the flywheel by opening the coupling device. The driving element can then be returned to its starting position by a suitable return device, for example by a spring device.

A preferred embodiment of the flywheel-driven setting tool is characterized in that the flywheel in the Reibschlussverbindungsabschnitt has at least one friction surface which is frictionally connected to a counter-friction surface on the driving element. The frictional engagement can be made in a similar way to conventional setting tools in which the driving element is frictionally connected to the flywheel.

Another preferred exemplary embodiment of the flywheel-driven setting tool is characterized in that the friction surface on the flywheel or the counter-friction surface on the driving element is designed to be particularly abrasion-resistant and / or wear-resistant and / or has an increased coefficient of friction. The desired properties of the friction surface can be realized, for example, by means of a surface treatment, in particular by a thermal spray coating. The special design of the friction surface on the flywheel or the counter friction surface on the driving element advantageously ensures that little or no abrasion occurs during operation of the setting device, which could undesirably impair the function of the positive connection section on the driving element.

A further preferred exemplary embodiment of the flywheel-driven setting tool is characterized in that the flywheel has at least one V-groove in the frictionally engaging connecting section, which is frictionally connectable to a counter-V-groove on the driving element. As a result, the friction surface is advantageously increased. This provides the advantage that less slip occurs in the frictional connection between the flywheel and driving element.

A further preferred embodiment of the flywheel-driven setting tool is characterized in that the flywheel in the positive connection connecting portion has at least one positive locking structure, in particular a toothing, which with a complementary form-fitting structure, in particular a counter-toothing, on the driving-in element can be positively connected. The form-fitting structure comprises, for example, an external toothing on the flywheel. The external toothing on the flywheel is for example in engagement with a rack-like toothing on the driving element.

A further preferred exemplary embodiment of the flywheel-driven setting tool is characterized in that the complementary form-fitting structure, in particular the counter-toothing, is arranged in a rear region of the driving-in element which is remote from a setting end. The driving element is in the setting tool preferably translationally to the setting end to and from the setting away back and forth movable. The complementary positive locking structure is preferably arranged in a region of the driving element, in which, during operation of the setting device, a flywheel peripheral speed corresponds to the speed of the translationally moving driving element. The acceleration to the desired common speed is achieved by the frictional engagement between the driving element and the flywheel. By the same speed, the production of the positive connection between the flywheel and driving element is considerably simplified. In particular, an undesirable wear during the production of positive engagement between the flywheel and driving element is reduced.

A further preferred embodiment of the flywheel-driven setting tool is characterized in that the form-fitting pairing between the flywheel and the driving element is combined with at least one damping element. The damping element is advantageously used to keep the load of the form-fitting structure on the flywheel and the complementary positive locking structure on the driving element in establishing the positive connection within predetermined limits. As a result, undesired wear during the production of positive engagement between the flywheel and the driving element can be further reduced.

In a method of operating a flywheel-driven setting device for driving fasteners into a ground, having a drive in a setting direction by a flywheel driving element having a connection region in which the driving element for transmitting a driving force from the flywheel to the driving element connectable to the flywheel is, in particular a setting device described above, the above-mentioned object is alternatively or additionally achieved in that a drive torque provided by a drive motor is frictionally transmitted from one or the flywheel in a first power transmission step and in a second power transmission step to the driving element. Due to the frictional connection, the driving element is accelerated to a desired speed in a first time period by the frictional engagement with the flywheel. Once the desired speed is reached, the driving element is then positively connected to the flywheel. The positive connection ensures in a simple manner that the force or acceleration of the driving element is transmitted without slippage to a fastening element at the setting end of the setting device. As a result, a particularly effective driving of fasteners, especially in hard surfaces, is simplified.

A preferred embodiment of the method is characterized in that the frictional power transmission decoupled and / or the positive power transmission is initiated when the flywheel has accelerated the driving element to its maximum speed. The acceleration of the driving element to its maximum speed preferably takes place frictionally. As a result, unwanted wear during acceleration of the driving element can be kept small.

The invention further relates to a driving element and / or a flywheel for a previously described setting tool. The driving element and the flywheel are separately tradeable.

• Figur 1 eine vereinfachte Darstellung eines schwungradangetriebenen Setzgeräts mit einem Schwungrad, das vor einer Kupplungsauslösung weder reibschlüssig noch formschlüssig mit einem Eintreibelement verbunden ist;
• Figur 2 das Setzgerät aus Figur 1, wobei das Eintreibelement reibschlüssig mit dem Schwungrad verbunden ist;
• Figur 3 einen Ausschnitt aus Figur 1 mit dem Schwungrad und dem damit reibschlüssig verbundenen Eintreibelement;
• Figur 4 die Ansicht eines Schnitts entlang der Linie IV-IV in Figur 3;
• Figur 5 den gleichen Ausschnitt wie in Figur 3, wobei das Eintreibelement formschlüssig mit dem Schwungrad verbunden ist;
• Figur 6 die Ansicht eines Schnitts entlang der Linie VI-VI in Figur 5;
• Figur 7 die Ansicht eines Schnitts entlang der Linie VII-VII in Figur 8, wobei das Schwungrad mit einer Außenverzahnung versehen ist;
• Figur 8 die Ansicht eines Schnitts durch das Schwungrad aus Figur 7 und
• Figur 9 ein kartesisches Koordinatendiagramm, in welchem ein Reibschlusskraftverlauf und ein Formschlusskraftverlauf über der Zeit aufgetragen sind.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, various embodiments are described in detail. Show it:

• FIG. 1 a simplified representation of a flywheel driven setting device with a flywheel, which is not frictionally engaged or form-fitting with a driving element before a clutch release;
• FIG. 2 the setting tool off FIG. 1 wherein the driving element is frictionally connected to the flywheel;
• FIG. 3 a section from FIG. 1 with the flywheel and thus frictionally connected driving element;
• FIG. 4 the view of a section along the line IV-IV in FIG. 3 ;
• FIG. 5 the same section as in FIG. 3 wherein the driving element is positively connected to the flywheel;
• FIG. 6 the view of a section along the line VI-VI in FIG. 5 ;
• FIG. 7 the view of a section along the line VII-VII in FIG. 8 wherein the flywheel is provided with an external toothing;
• FIG. 8 the view of a section through the flywheel FIG. 7 and
• FIG. 9 a Cartesian coordinate diagram in which a Reibschlusskraftverlauf and a positive locking force curve over time are plotted.

embodiments

In the FIGS. 1 and 2 is a flywheel driven setting tool 1 shown simplified with a housing 2. The setting tool 1 is designed as a hand-operated setting tool with a handle 4 and a setting end 5.

The setting device or setting tool 1 is used for driving fasteners 24 in a (not shown) underground. A desired number of fasteners 24 is stored in a magazine 6 at the setting end 5. From the magazine 6, the fastening elements 24, preferably automatically, provided individually in a bolt guide 8.

The energy required for driving in the fastening elements 24 is provided, for example, in the form of electrical energy in an accumulator 10 at the lower end of the handle 4. The electrical energy stored in the accumulator 10 is converted into rotational energy by means of an electric motor (not shown), which is advantageously integrated in a flywheel 13.

By this rotational energy, the flywheel 13 is rotated about a flywheel rotation axis 15 in rotation, as indicated by an arrow 16 in the FIGS. 1 and 2 is indicated. Upon actuation of a trigger or operating knob 12 on the handle 4 is a built-in setting tool 1 clutch, which is designed for example as a helical gear, so concluded that the rotational energy stored in the flywheel 13 is transmitted to a driving-in element 20 for triggering the setting process as translational energy.

The driving element 20 represents a setting piston 22, which is shortened referred to as a piston. The setting piston 22 and the driving element 20 is arranged between the flywheel 13 and a counter-roller 17.

The counter-roller 17 is rotatable about a counter-roller rotation axis 18, which is arranged parallel to the flywheel rotation axis 15. The counter-rollers 17, with the flywheel 13 and the driving element 20 arranged therebetween, constitute a clutch which, as will be explained below, is actuated by an electromagnet 37.

The setting piston 22 has at its in the FIGS. 1 and 2 left end of a piston tip 23, with which the fastener 24 at the setting end 5 of the setting device 1 in the (not shown) underground can be driven. The setting piston 22 and the driving element 20 is in the setting tool 1 by means of at least one piston guide 30 in the axial direction, ie in the FIGS. 1 and 2 to the left and to the right, moved back and forth.

The piston guide 30 comprises two guide rollers 31, 32. To drive in the fastening element 24, the setting piston 22 with its piston tip 23 is moved toward the fastening element 24 with great acceleration by the piston guide 30. After a setting process, the setting piston 22 by means of a return spring 34 back into his in the FIGS. 1 and 2 shown starting position moves.

The coupling in the setting tool 1 comprises a wedge 35, which is movable with a plunger 36 by the electromagnet 37 to the counter-roller 17 in FIG. 1 to press down against the driving element 20. In FIG. 1 the setting tool 1 is shown before a clutch release.

FIG. 1 shows the setting tool 1 immediately before a setting process. The flywheel 13 has been rotated, for example, by an integrated brushless electric motor and thus has energy in the form of rotational energy, as indicated by the arrow 16 in FIG FIG. 1 is indicated.

In FIG. 2 the clutch is actuated via the electromagnet 37 so that the driving element is pressed by the counter-roller 17 down against the flywheel 13. As a result, a frictional engagement between the flywheel 13 and the driving element 20 is produced.

The frictional engagement causes the indicated by the arrow 16 rotational movement of the flywheel 13 is transmitted to the driving element 20, so that this in a direction indicated by an arrow 45 setting direction in FIG. 2 is moved to the left on the fastener 24 in the pin guide 8 to. As soon as the driving element 20 with the piston tip 23 strikes the fastening element 24, it is driven into the ground at the setting end 5 of the setting device 1.

The driving element 20 comprises on its side facing the flywheel 13 a connecting portion 40. The connecting portion 40 is divided into a frictional engagement portion 41 and a positive connection portion 42. In the Reibschlussverbindungsabschnitt 41, the driving element 20 is purely frictionally connected to the flywheel 13. In the positive connection section 42, the driving element 20 is connected in a purely positive fit with the flywheel 13.

In the FIGS. 3 and 4 is a section of FIG. 2 represented with the driving element 20 and the flywheel 13 alone in two different views. To depict a friction fit 50 between the flywheel 13 and the driving element 20, a friction surface 51 of the flywheel 13 is frictionally connected to a counter friction surface 52 of the driving element 20. The counter friction surface 52 extends over the frictionally engaged portion 41 on the driving member 20.

In the positive connection section 42, the driving element 20 has teeth 61, 62. The teeth 61, 62 constitute a positive locking structure 64 on the driving element 20. The flywheel 13 comprises a complementary positive locking structure 65 FIG. 4 is the complementary form-fitting structure 65 arranged below.

In the FIGS. 3 and 4 was the trigger (12 in the FIGS. 1 and 2 ) of the setting device 1 and the setting piston 22 is finally pressed on the flywheel 13 via the electromagnet 37 and the counter-roller 17. The connection between the flywheel 13 and setting piston 22 is exclusively frictionally engaged. The setting piston 22 is rotated by the flywheel 13 in the linear direction (in FIG. 3 to the left).

In the FIGS. 5 and 6 the flywheel 13 is connected by a positive connection 60 with the driving element 20. The teeth 61, 62 of the form-fitting structure 64 are positively connected to the in FIG. 6 connected above complementary complementary form-locking structure 65.

FIG. 5 shows the flywheel 13 and the driving element 20 just before the setting piston 22 has reached its bottom dead center position. By the positive connection 60 large forces can be transmitted. The frictional connection is in the in the FIGS. 5 and 6 repealed piston position shown. The friction surface 51 on the flywheel 13 does not touch the counter friction surface 52 on the driving element 20.

In the FIGS. 7 and 8 the flywheel 13 and the driving element 20 are shown in sectional view. In FIG. 7 is schematically indicated on the flywheel 13 a tooth flank contour, which represents a form-fitting structure 70. The interlocking structure 70 is used together with the teeth 61, 62 for producing the positive connection at the end of the piston stroke.

In FIG. 9 a Cartesian coordinate diagram is shown with an x-axis 75 and a y-axis 76. On the x-axis 75 a time is plotted in a suitable time unit. On the y-axis 76, a force is applied in a suitable power unit. By a solid line 81, a Reibschlusskraftverlauf a frictional power transmission between the flywheel 13 and the driving element 20 is shown. By a dashed line 82, a positive connection force course of a positive power transmission between the flywheel 13 and the driving element 20 is shown.

First, there is no transmission of force between the flywheel 13 and the driving element 20. The clutch is not yet activated. After the operation of the clutch, so the pressing of the counter-roller 17 to the driving element 20, the force or the moment of the flywheel 13 is frictionally transmitted to the driving element 20 and the setting piston 22 or piston, and from a time 78 in FIG. 9 ,

Since slippage first occurs, the frictional force transmission 81 increases over a certain gradient. After the setting piston 22 or piston has covered a large part of its piston travel, a transition from frictional engagement 50 to positive connection 60 takes place at a point in time 79. The frictional engagement 50 is completely released and the positive connection 60 comes, for example at a time 80, alone to bear.

Claims (10)

Flywheel-driven setting tool (1) for driving fastening elements (24) into a substrate, having a drive-in element (20) drivable in a setting direction by a flywheel (13), which has a connection region (40) in which the driving element (20) is for transmission a drive force from the flywheel (13) to the drive-in element (20) is connectable to the flywheel (13), characterized in that the connection area (40) of the drive-in element (20) has at least one frictional connection section (41) for frictional engagement (50). and at least one positive connection section (42) for showing a positive connection (60) between the flywheel (13) and the driving element (20). Flywheel driven setting tool according to claim 1, characterized in that the flywheel (13) in the Reibschlussverbindungsabschnitt (41) at least one friction surface (51) which is frictionally connectable with a Gegenreibfläche (52) on the driving element (20). Flywheel driven setting tool according to claim 2, characterized in that the friction surface (51) on the flywheel (13) or the counter friction surface (52) on the driving element (20) is designed to be particularly resistant to abrasion and / or wear and / or has an increased coefficient of friction. Flywheel driven setting tool according to claim 2 or 3, characterized in that the flywheel (13) in the Reibschlussverbindungsabschnitt (51) has at least one V-groove which is frictionally connected to a counter-V-groove on the driving element (20). Flywheel driven setting tool according to one of the preceding claims, characterized in that the flywheel (13) in the positive connection portion (41) at least one positive locking structure (64), in particular a toothing (70), which with a complementary positive locking structure (65), in particular a Counter-toothing (61,62) on the driving element (20) is positively connected. Flywheel driven setting tool according to claim 5, characterized in that the complementary positive locking structure (65), in particular the counter teeth (61,62), in a rear, by a setting end (5) remote area of the driving element (20) is arranged. Flywheel driven setting tool according to one of the preceding claims, characterized in that the positive locking pairing between the flywheel (13) and the driving element (20) is combined with at least one damping element. Method for operating a flywheel-driven setting device (1) for driving fastening elements (24) into a base, having a driving element (20) which can be driven in a setting direction by a flywheel (13) and has a connecting region (40) in which the driving element (40) 20) for transmitting a driving force from the flywheel (13) to the driving element (20) with the flywheel (13) is connectable, in particular a flywheel driven setting device according to one of the preceding claims, characterized in that a drive motor provided by a drive torque of one or the flywheel (13) is frictionally transmitted in a first power transmission step and in a second power transfer writing on the driving element (20). A method according to claim 8, characterized in that the frictional power transmission decoupled and / or the positive power transmission is initiated when the flywheel (13) has accelerated the driving element (20) to its maximum speed. Driving element (20) and / or flywheel (13) for a setting device (1) according to one of the preceding claims.

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