EP2524772A2 - Bolt fastening device and method for operating same - Google Patents

Abstract

The bolt setting device (1) has a trigger (15) which is movable for triggering a setting process by applying a force against a counter force. The trigger is assigned to a counter force generating unit (20) with a counter force-way-distribution that has a local maximum. The counter force is increased before or after the local maximum to the local maximum. An independent claim is included for a method for operating a bolt setting device.

Description

Technical area

The invention relates to a bolt setting device for setting fasteners in a ground, with a trigger that is movable to trigger a setting operation by applying a force against a counter force. The invention further relates to a method for operating such a bolt setting device.

State of the art

From the German patent application DE 10 2005 000 032 A1 a combustion-powered setting tool with a propellant charge and an ignition unit is known, which is actuated via a trigger switch on a handle of the setting device.

Presentation of the invention

The object of the invention is to improve the operation of a bolt gun according to the preamble of claim 1 on.

The object is achieved in a bolt setting device for setting fasteners in a substrate, with a trigger that is movable to trigger a setting operation by applying a force against a counter force, solved in that the trigger is assigned a counter-force generating device with a drag force path which has a local maximum. The trigger is a trigger or trigger of the bolt gun. When the trigger is actuated, for example, a bolt is set. Before setting a bolt, the bolt gun is pressed against a substrate into which the bolt is to be placed. By pressing the bolt setter to the ground, the implementation of preparatory measures for setting the bolt can be released in the bolt gun. The actual setting process is by the Pressing, ie pulling or pressing, triggers the trigger. Due to the local maximum in the counter-force path, a counter-force peak is provided, which reliably prevents an unintentional triggering of a setting process. In addition, the setting quality can be increased by the counter-force path according to the invention.

A preferred embodiment of the bolt setting tool is characterized in that the counterforce increases linearly before and / or after the local maximum. The counterforce increases when applying an actuating force to the trigger preferably from zero steadily to the local maximum. Thereafter, the counterforce preferably abruptly drops to a low value. From this low value, the counterforce then preferably increases again continuously linear.

A further preferred embodiment of the bolt-firing device is characterized in that the counterforce to the local maximum has a local minimum. The transition from the local maximum to the local minimum occurs abruptly or abruptly, preferably by a snap spring effect or crackpot effect.

A further preferred exemplary embodiment of the bolt setting tool is characterized in that the counterforce increases more steeply before the local maximum than after the local maximum or the local minimum. The counterforce preferably increases significantly steeper before the local maximum than after the local maximum or after the local minimum.

A further preferred embodiment of the bolt-firing device is characterized in that the counterforce remains smaller after the local maximum up to a path end than at the local maximum. At the end of travel, the counterforce preferably has a final value that is less than half of the local maximum.

A further preferred embodiment of the bolt setting device is characterized in that the local maximum is arranged in front of at least one way mark, upon reaching a defined function of the bolt setting device is triggered. The local maximum is preferably arranged in front of several way marks, upon reaching each of which a defined function of the bolt setting device is triggered. After the abrupt or abrupt drop in the counterforce, the trigger is preferably further moved with a relatively large actuation force, which was needed to overcome the local counterforce maximum. This makes the trigger particularly advantageous fast moved to the end of the path, whereby all defined functions of the bolt gun safely triggered.

A further preferred exemplary embodiment of the bolt setting tool is characterized in that the local maximum is arranged in front of a route mark, upon the reaching of which a setting process is triggered. Due to the counter-force path according to the invention, a delayed escape of the bolt from the setting tool can be prevented.

A further preferred exemplary embodiment of the bolt-setting tool is characterized in that the counter-force generating device comprises a counterforce spring. The counterforce spring is preferably similar or designed as a snap frog spring, as it is known as a toy. A snap frog spring is formed for example from a strip of spring steel, which is shaped or shaped so that it suddenly abruptly jumps when applying a force, with a cracking noise occurs.

Another preferred embodiment of the bolt setting tool is characterized in that the counterforce spring is designed as a leaf spring with a curvature. As a result of the curvature, an abrupt change, in particular an abrupt, steady decrease, of the counterforce caused by the spring is achieved from a local counter force maximum to a local counterforce minimum when an actuating force is applied.

A further preferred embodiment of the bolt setting tool is characterized in that the counterforce spring has two bearing points and a force introduction point. The force introduction point is preferably arranged substantially centrally between the two bearing points at the ends of the leaf spring. An alternative embodiment of the bolt setting tool is characterized in that the counterforce spring has exactly one bearing point and a force introduction point.

In a method for operating a bolt gun previously described the above object is alternatively or additionally achieved in that when applying a force on the trigger a counter-force peak must be overcome before a setting process is triggered. The counter-force peak corresponds to the local maximum in the counter-force-path curve and is therefore also referred to as the counterforce maximum. After overcoming the force peak, a user automatically pulls or pushes the trigger through to the end of travel. This ensures that all defined functions are triggered within a short time.

Figur 1

eine vereinfachte Darstellung eines Bolzensetzgeräts mit einer Gegenkrafterzeugungseinrichtung in einem nicht angepressten und entspannten Zustand;

Figur 2

das Bolzensetzgerät aus Figur 1 im angepressten Zustand;

Figur 3

das Bolzensetzgerät aus Figur 2 mit betätigtem Trigger;

Figur 4

ein kartesisches Koordinatendiagramm mit einer Kennlinie, die einen erfindungsgemäßen Gegenkraft-Weg-Verlauf darstellt;

Figur 5

eine perspektivische Darstellung einer Gegenkraftfeder, mit der ein Gegenkraft-Weg-Verlauf, wie er in Figur 4 gezeigt ist, dargestellt werden kann;

Figur 6

eine Vorderansicht der Gegenkraftfeder aus Figur 5;

Figur 7

die Ansicht eines Schnitts entlang der Linie VII-VII in Figur 6 und

Figur 8

eine perspektivische Darstellung eines geöffneten Gehäuses eines Bolzensetzgeräts mit Blick auf einen Trigger und eine Gegenkraftfeder, wie sie in den Figuren 5 bis 7 dargestellt ist.

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 bolt gun with a counter-force generating device in a non-pressed and relaxed state;

FIG. 2

the bolt gun off FIG. 1 in the pressed state;

FIG. 3

the bolt gun off FIG. 2 with activated trigger;

FIG. 4

a Cartesian coordinate diagram with a characteristic curve, which represents a counterforce-distance curve according to the invention;

FIG. 5

a perspective view of an opposing force spring, with a drag force path, as in FIG. 4 is shown can be displayed;

FIG. 6

a front view of the counterforce spring FIG. 5 ;

FIG. 7

the view of a section along the line VII-VII in FIG. 6 and

FIG. 8

a perspective view of an open housing of a bolt gun with a view of a trigger and a counter force spring, as shown in the FIGS. 5 to 7 is shown.

embodiments

In the FIGS. 1 to 3 a bolt gun 1 is shown in various states. The bolt setting device 1 comprises a housing 2 with a cylinder 3 and a handle 4. On the handle 4, the bolt setting device 1 for driving a fastener can be tacked, which emerges from a bolt guide 6 at a bolt setting end 5.

For driving the fasteners into a substrate energy is required, which can be provided for example in a gas cartridge inside the bolt gun. The gas cartridge can be connected via a metering valve with a combustion chamber in a combustion chamber sleeve 8. In the combustion chamber is gas from the gas cartridge mixed with air to form a combustible mixture which is ignited to provide the energy needed to drive the bolt into the ground.

Before a bolt setting operation, the bolt setting device 1 must be pressed against the ground in order to be put into a setting ready state. When pressing the bolt-firing device 1, a pressing rod 10 is moved against the biasing force of a compression spring 12 in the bolt setting device 1 in until the bolt-setting 5 abuts flush with the ground.

After pressing the bolt setting device 1 into the ground, the setting process is triggered by a trigger 15. The trigger 15 cooperates with a switching device 18, which transmits, for example, a signal for setting a bolt to a controller, which in turn triggers the ignition of the ignitable mixture in the combustion chamber in the combustion chamber sleeve 8. In this case, the trigger 15 can have both controlling and signaling functions.

Upon actuation, that is to say pulling or pressing, of the trigger 15, the latter is moved toward the switching device 18 against a counterforce of a counter-force generating device 20. The counter-force generating device 20 preferably comprises an opposing force spring, as in the FIGS. 5 to 7 is shown. The counterforce spring preferably has a drag force path, as in FIG. 4 is shown.

At the trigger 15, a bracket 24 is hinged, which is guided in a specially trained storage 25 in a housing wall of the housing 2 in the handle 4 of the bolt setting device 1. In the in FIG. 1 illustrated relaxed device state of the bracket 24 is located on the combustion chamber sleeve 8, whereby he blocked in combination with its storage 25, the actuation of the trigger 15.

Once the bolt gun is fully pressed, as shown in FIG. 2 is shown, the bracket 24 and thus the trigger 15 is released from the combustion chamber sleeve 8. In FIG. 3 it can be seen that when pulling the released trigger 15, the switching device 18 is actuated, so that a signal is generated. At the same time, the bracket 24 due to its bearing 25 performs a pivoting movement on a shoulder or in a concave geometry of the combustion chamber sleeve 8, so that it is blocked in the axial direction by the bracket 24. With regard to the functions occurring during the setting process, it is advantageous for the trigger 15 to travel as far as possible between the individual functions in a controlling and / or signaling manner. This ensures a desired sequence of functions. In addition, the influence of part tolerances is minimized. At a slow set frequency, the bolt gun is also insensitive to different user behavior.

However, with a fast set rate, a large actuation path can increase the impact of user behavior. It may happen, for example, that the bolt setting device 1 is already lifted off the ground again before the trigger 15 is fully pulled through. Due to the inertia of the bolt setting device remains after lifting off the ground briefly in the pressed state, so that the trigger 15 can be pulled. Then it can happen that a bolt emerges from the bolt setting tool late, which leads to a bad setting quality, since the bolt guide 6, which guides the bolt, is no longer connected to the ground.

According to one essential aspect of the invention, the counter-force generating device 20 has a special counterforce-travel curve, which in FIG. 4 is represented by a characteristic curve 30 in a Cartesian coordinate diagram. The Cartesian coordinate diagram comprises an x-axis 31 and a y-axis 32. On the y-axis 32, the counterforce generated by the counterforce generating device 20 is plotted in Newtons. On the x-axis 31, the associated path of the trigger 15 is plotted in millimeters. By the characteristic curve 30, the signaling and / or controlling functions of the trigger 15 can be reliably met in a simple manner. As a result, a high setting quality can be ensured even with a fast setting frequency.

The characteristic curve 30 of the counter-force generating device 20 initially rises from zero to a local maximum 34. The local maximum corresponds to a counter-force peak, which gives the trigger 15 a clear pressure point behavior. In this case, the counter-force generating device 20 according to the invention is designed so that the counterforce drops abruptly or abruptly to a local minimum 35 after the local maximum 34. After the local minimum 35, the characteristic 30 increases linearly, but with a significantly lower slope than before the local maximum 34.

After passing through the local maximum 34 and the local minimum 35, signaling and / or controlling functions 35, 37, 38 are triggered. The user can not react so quickly after the counter force has dropped from the local maximum 34 to the local minimum 35, and therefore continues to press the trigger 15 with a relatively high initial actuation force, which must be greater than the local maximum 34. As a result of which the trigger 15 is pulled through or pressed very quickly to a stop at the path end 39 of the trigger 15, whereby all functions are triggered 36 to 38 safely. This reduces the influence of user behavior.

Between the individual functions 36 to 38 of the trigger 15 enough game can be installed. This can reduce the influence of part tolerances. A delayed escape of a bolt after lifting the bolt setting device 1 from the ground is no longer possible because it is ignited as long as the bolt setting tool is pressed against the bolt setting end 5 on the ground. On the one hand, this leads to a better set quality and, on the other hand, to an increase in safety.

Another advantage is that the user gets a clear tactile feedback about the fact that he has actuated the trigger 15. So he can better see when the bolt gun triggers. This is especially helpful when a very precise setting point is required. The user can, as long as he aims with the bolt setting end 5, leave a finger on the trigger 15, without fear that he overcomes the counterforce maximum with a relatively low contact force and triggers an unwanted setting.

In the FIGS. 5 to 7 the counterforce spring 40 is shown in different views. The counterforce spring 40 is designed as a curved leaf spring, which is mounted at two bearing points 41, 42 at their ends in the handle of the bolt setting device. Due to the curved shape of the leaf spring 40 creates a cracking frog effect, the user on the first millimeter of the deflection of the leaf spring a force peak in the form of the local maximum 34 in FIG. 4 must overcome. After the local maximum 34, the opposing force exerted by the leaf spring 40 rapidly drops to the local minimum 35 and remains low for the remainder of the actuation path. By an arrow 45 is in FIG. 7 indicated that the force is applied by the trigger 15 approximately in the middle on the convex side of the curvature of the leaf spring 40.

In FIG. 8 an embodiment of a bolt setting device 51 is shown in perspective with the housing open. In a handle 54 of the bolt setting device 51 is a counterforce spring 40, as shown in the FIGS. 5 to 7 is shown between a trigger 55, the trigger 15 in the FIGS. 1 to 3 corresponds, and a switching device 58 is clamped, the switching device 18 in the FIGS. 1 to 3 equivalent.

Claims (13)

Bolt setting tool for setting fastening elements in a substrate, with a trigger (15; 55), which is movable to trigger a setting operation by applying a force against a counter force, characterized in that the trigger (15; 55) a counter-force generating means (20) associated with a drag force path having a local maximum (34). Stud gun according to claim 1, characterized in that the counterforce increases linearly before and / or after the local maximum (34) towards the local maximum (34). Bolt setting tool according to one of the preceding claims, characterized in that the counterforce to the local maximum (34) has a local minimum (35). Bolt setting tool according to one of the preceding claims, characterized in that the counterforce before the local maximum (34) increases steeper than after the local maximum (34). Stud gun according to one of the preceding claims, characterized in that the counterforce remains smaller after the local maximum (34) up to a travel end than at the local maximum (34). Bolt setting tool according to one of the preceding claims, characterized in that the local maximum (34) is arranged in front of at least one way mark (36, 37, 38), upon reaching which a defined function of the bolt setting device (1, 51) is triggered. Bolt setting tool according to one of the preceding claims, characterized in that the local maximum (34) is arranged in front of a way mark (36), upon reaching a setting process is triggered. Bolt setting tool according to one of the preceding claims, characterized in that the counter-force generating device (20) comprises a counterforce spring (40). Bolt setting tool according to claim 8, characterized in that the counterforce spring (40) is designed as a leaf spring with a curvature. Bolt setting tool according to claim 8 or 9, characterized in that the counterforce spring (40) between the trigger (15; 55) and a switching device (18; 58) is arranged. Bolt setting tool according to one of the preceding claims, characterized in that the counterforce spring (40) has two bearing points (41, 42) and a force introduction point (45). Bolt setting tool according to one of the preceding claims, characterized in that the counterforce spring (40) has exactly one bearing point (41) and a force introduction point (45). Method for operating a bolt setting device (1; 51) according to one of the preceding claims, characterized in that when applying a force to the trigger (15; 55), a counterforce tip (34) must be overcome before a setting operation is triggered.

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