EP3129189B1 - Handheld and semi-stationary setting tool - Google Patents

Description

Technical area

The invention relates to a hand-held and semi-stationary setting tool for driving fasteners by means of a working piston in a ground, with a housing which comprises an attachment means at an outlet end. The invention further relates to a method for operating such a setting device.

State of the art

From the German patent application DE 28 50 273 A1 is a powder-powered setting tool for driving fasteners with a housing and a barrel disposed therein, the barrel being axially displaceable relative to a cartridge bearing containing part, the barrel having in its rear region facing away from the driving direction, acted upon by the combustion gases shoulder surface, wherein the barrel in the front region has a support shoulder for the axial support of a support material which can be placed on the receiving material, and wherein an elastic member is provided between the support shoulder of the barrel and the support mass.

From the German patent application DE 24 24 774 A1 For example, a bolt rubbing apparatus is known in which a housing is connected to a gun barrel in which a driving piston is slidably housed. A rear end of the driving piston opens into a combustion chamber, which has a blind pressing space. A portion of a powder charge compressed by the rear end of the drive piston reduces the contents of the compression space to a preselected ratio.

From the US 2002/0038812 A1 a setting tool is known in which a bolt guide is secured in a tool housing against axial displacement. The setting tool has a spring-loaded Anpressfühler and a safety sleeve which surrounds the Anpressfühler and is supported so that it is axially movable with the Anpressfühler and axially movable relative to the Anpressfühler.

Presentation of the invention

The object of the invention is to simplify the operation of a hand-held or semi-stationary setting tool for driving fasteners by means of a working piston into a substrate, with a housing which comprises an attachment means at an exit end.

The task is in a hand-held and semi-stationary setting tool for driving fasteners by means of a working piston in a ground, with a
Housing, which comprises an attachment device at an outlet end, achieved in that the working piston is coupled to the attachment means that when driving a fastener into the ground energy of the working piston removed and transferred to the attachment means to press the attachment means against the ground , The hand-held or semi-stationary setting tool is operated, for example, with fuel gas, propellant powder, compressed air or electric current. The energy required to drive in the fastening elements is transmitted to the fastening elements via the working piston. In contrast to conventional solutions, as for example from the German patent application DE 28 50 273 A1 are known, the energy for the attachment means is not taken directly, for example from a combustion chamber, but via the working piston. This has proved to be advantageous in investigations carried out in the context of the present invention, in particular with regard to a repeatedly reproducible high setting quality.

A preferred embodiment of the hand-held or semi-stationary setting tool is characterized in that the working piston is coupled via a spring device with the attachment means. The spring device is preferably arranged between the working piston and the attachment device. Upon a forward movement of the working piston, the spring device is tensioned and transmits a force in the forward direction to the attachment device. In this case, the spring device preferably has a length which corresponds at least to the length of the fastening elements. This ensures in a simple manner that the Eintreibfunktion the working piston is maintained.

A further preferred embodiment of the hand-held or semi-stationary setting tool is characterized in that the spring device comprises at least one elastomeric spring, a spiral spring, a plate spring and / or a fluid spring. Depending on the application, different springs can be combined. The fluid spring is, for example, an air spring. The fluid spring may advantageously be equipped with a valve. In order to influence the force curve, a contact time between the working piston and the spring device can be varied, for example by the length of the spring device. This can be achieved in a simple manner that the power transmission between the working piston and the attachment means starts sooner or later. In addition, the spring characteristic of the spring device can be varied.

Another preferred embodiment of the hand-held or semi-stationary setting tool is characterized in that the working piston is coupled via a friction and / or clamping device with the attachment means. The friction and / or clamping device is preferably coupled to a guide device, which in turn is advantageously combined with the attachment device. The working piston is preferably guided with one end in the guide device. Via a clamping and / or friction contact, an axial force can be transmitted from the working piston to the guide device. The contact point or friction point can be carried out in various ways.

A further preferred embodiment of the hand-held or semi-stationary setting tool is characterized in that the friction and / or clamping device is designed and arranged so that when driving a fastener, a part of an axial driving force is transmitted from the working piston to the front attachment. The friction and / or clamping device comprises for this purpose, for example, at least one friction and / or clamping element on the guide means, which is under radial contact force in contact with the working piston.

A further preferred embodiment of the hand-held or semi-stationary setting tool is characterized in that the friction and / or clamping device is designed and arranged so that a return of the working piston after a driving operation is not or only slightly hindered. This ensures in a simple manner that the working piston return is not adversely affected by the friction and / or clamping device in an undesirable manner. With the friction and / or clamping device, the force curve can be advantageously varied via a driving operation.

Another preferred embodiment of the hand-held or semi-stationary setting tool is characterized in that the working piston is coupled via a magnetic field source with the attachment means. The magnetic field source comprises, for example, at least one magnet, for example an electromagnet or a permanent magnet.

A further preferred embodiment of the hand-held or semi-stationary setting tool is characterized in that the magnetic field source is integrated in a guide body for guiding the fastening elements at the outlet end. The guide body is preferably not only for guiding the fasteners. Particularly advantageously, the working piston protrudes into the guide body with one end. With the help of the magnetic field source, the guide body can be advantageously coupled to the working piston.

A further preferred embodiment of the hand-held or semi-stationary setting tool is characterized in that the attachment means is combined with a guide device for guiding the fastening elements at the outlet end. The guide device advantageously comprises the previously described guide body, which serves for guiding the fastening elements at the outlet end of the setting device. The working piston preferably protrudes into the guide device with one end. As a result, the coupling of the working piston is simplified with the attachment means. The guide body is for example integrally connected to a header body, which is designed for example as a front plate.

In a method for operating a hand-held or semi-stationary setting device for driving fasteners by means of a working piston into a substrate, with a housing comprising an attachment means at an exit end, in particular a previously described hand-held or semi-stationary setting tool, the above stated object is alternatively or additionally achieved in that the working piston is coupled to the attachment means that when driving a fastener into the ground energy of the working piston removed and transmitted to the attachment means to press the attachment means against the ground. Of course, only part of the energy of the working piston is taken for the attachment device. The majority of the power of the power piston is used to drive in the fasteners.

The invention further relates to an attachment device for a previously described hand-held or semi-stationary setting tool. The attachment can be traded separately.

The setting tool according to the invention is preferably a setting tool for setting fastening elements, such as bolts. Therefore, such a setting device is also referred to as a bolt setting device. The setting device is operated, for example, with gas as fuel. The gas is provided, for example, in a gas can or gas cartridge, which is inserted into the setting tool.

Figur 1

eine vereinfachte Darstellung eines Setzgeräts gemäß einem ersten Ausführungsbeispiel, bei welcher ein Arbeitskolben des Setzgeräts über eine Federeinrichtung mit einer Vorsatzeinrichtung gekoppelt ist;

Figur 2

ein ähnliches Setzgerät wie in Figur 1, wobei der Arbeitskolben über eine Reibungs- und/oder Klemmeinrichtung mit der Vorsatzeinrichtung gekoppelt ist und

Figur 3

ein ähnliches Setzgerät wie in den Figuren 1 und 2, wobei der Arbeitskolben über eine Magnetfeldquelle mit der Vorsatzeinrichtung gekoppelt 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 setting device according to a first embodiment, in which a working piston of the setting device is coupled via a spring means with a Vorsatzzeinrichtung;

FIG. 2

a similar setting device as in FIG. 1 , wherein the working piston is coupled via a friction and / or clamping device with the attachment means and

FIG. 3

a similar setting device as in the FIGS. 1 and 2 , wherein the working piston is coupled via a magnetic field source with the attachment means.

embodiments

In the FIGS. 1 to 3 is a setting tool 1; 41; 61 greatly simplified in accordance with three different embodiments of the invention. The setting device 1; 41; 61 is similar or similar to the German Offenlegungsschrift in terms of its external structure DE 28 50 273 A1 disclosed powder-operated bolt gun running.

In the FIGS. 1 to 3 the same reference numbers are used to designate the same or similar parts. In the following, the common features of the three exemplary embodiments are discussed first. After that, mainly the differences between the three embodiments will be discussed.

That in the FIGS. 1 to 3 Setting device 1 shown in different embodiments; 41; 61 comprises an unspecified housing with a handle on which the setting tool 1; 41; 61 for driving a fastener in a substrate 3 can be tacked. The fastener occurs at a setting end or outlet end 5 of the setting device 1; 41; 61 off.

The fasteners used are preferably provided via a device-internal magazine, which is in the vicinity of the outlet end or setting end 5 of the setting device 1; 41; 61 is attached. From the magazine, the fasteners, preferably individually, automatically removed and provided at the setting end 5.

The energy required for driving the fasteners into the ground is, for example, in a fuel container in the interior of the setting device 1; 41; 61 provided. The fuel in the fuel container is, for example, LPG. Therefore, the fuel container is also referred to as a gas can or gas cartridge.

The fuel tank can be connected via an adjustable or controllable metering device with a connecting line with a combustion chamber or a combustion chamber. The metering device is preferably designed as a metering valve.

In the combustion chamber or the combustion chamber, fuel, ie gas, from the fuel container mixed with air to form a combustible mixture which is ignited by an ignition device to drive a fastener, such as a bolt or a nail into the ground. The energy required for driving is when pressing a trigger or trigger of the setting device 1; 41; 61 transmitted via a piston 8 from the combustion chamber to a fastener at the setting end 5.

The working piston 8 comprises a base body 9, from which a plunger 10 starts. The setting device 1; 41; 61 further includes an attachment means 14 which is placed on the substrate 3 prior to driving a fastener. The attachment device 14 comprises a front plate 15, which is brought to the substrate 3 for conditioning.

The front plate 15 is integrally connected to a guide body 16, which is designed as a guide sleeve. The guide body or the guide sleeve 16 serves to represent a guide device 18 for the fasteners to be driven.

The working piston 8 protrudes with a free end of the plunger 10 in the guide device 18, that the plunger 10 is guided in the guide body 16. When driving a fastener of the plunger 10 is further moved into the guide means 16 into the ground 3, to drive the (not shown) fastener into the substrate 3.

When placing fasteners, such as nails or bolts, with conventional setting tools on concrete it often comes to flaking due to the nature of the substrate 3. These flakes can reduce the holding force of the fastener in the ground 3. In addition, the appearance of the breakpoints on the otherwise relatively smooth surface surface, such as a concrete surface, adversely affected and reduces the confidence in the attachment point.

By means of the attachment device 14, these unwanted spallings can be reduced in their extent and frequency. According to an essential aspect of the invention, the energy required to push the attachment 14 against the ground 3 is extracted via the power piston 8. For this purpose, the working piston 8 is coupled to the attachment device 14.

At the in FIG. 1 Setting tool 1 shown, the working piston 8 is coupled via a spring device 20 with the attachment device 14. The spring device 20 comprises a spiral spring 21 which is arranged in the axial direction between a formed on the base body 9 of the working piston 8 shoulder 22 and an end face 23 of the guide body 16, which faces away from the substrate 3.

By an arrow 24, a movement of the working piston 8 when driving a fastener is indicated. Due to the associated forward movement of the working piston 8, the spring device 20 is tensioned and transmits part of the driving force of the working piston 8 on the guide body 16 of the guide means 18 and the attachment plate 15 of the attachment means 14. As a result, the attachment plate 15 of the attachment means 14 is biased against the substrate 3 as indicated by arrows 25 and 26.

So that the working piston 8 can still fully fulfill its Eintreibfunktion, the spring device 20 should advantageously compress at least the length of a fastener. Other than illustrated, the spring means 20 may also include an elastomeric spring. The spring device 20 may also include an air spring, which builds up a dynamic pressure in front of the working piston 8, for example.

In order to influence the force curve of the biasing force of the biasing device 14, the contact time between the working piston 8 and the spring device 20 through the Length of the spring device 20 can be varied. This can be achieved that the power transmission begins sooner or later. In addition, the spring characteristic of the spring device 20 can be varied.

At the in FIG. 2 Setting device 41 shown, the working piston 8 is coupled via a friction and / or clamping device 45 with the attachment device 14. The friction and / or clamping device 45 includes, for example on the guide body 16 of the guide device 18 at least one friction and / or clamping element, which is under radial contact force in contact with the working piston 8.

About this contact, the working piston 8 can transmit an axial force on the guide body 16 of the guide means 18 and the attachment plate 15 of the attachment means 14, as indicated by arrows 51; 52, 53 and 54, 55 is indicated. The contact point can be designed in different ways. It is important that wear of contact materials in the operation of the setting device 41 is taken into account. Due to operational wear of the contact materials, the force curve of the pretensioning force of the attachment device 14 may change.

In order not to hinder the return of the working piston 8 after a setting process, the friction and / or clamping device 45 is preferably designed so that the clamping effect described above only in a forward movement of the working piston 8 in the direction of arrow 51 in FIG. 2 occurs.

During operation of the friction and / or clamping device 45, the force curve of the pretensioning force of the attachment device 14 can be varied via the fastening drive. For this purpose, for example, a defined profile can be provided on the working piston 8. Depending on the piston position, the clamping force can be influenced via the defined profile.

At the in FIG. 3 Setting tool 61 shown, the working piston 8 is coupled via a magnetic field source 65 with the attachment means 14. The magnetic field source 65 comprises, for example, a plurality of permanent magnets or electromagnets, indicated only by rectangles, in the guide body 16 of the guide device 18.

With the aid of the magnetic field source 65, an eddy current can be generated in the rapidly moving working piston 8 formed from an electromagnetically conducting material. The movement of the working piston 8 when driving a fastener is indicated by an arrow 71.

By arrows 72 and 73 eddy currents are indicated, by which the working piston 8 is braked relative to the guide means 18 and the attachment means 14. The associated braking force leads to an indicated by arrows 74 and 75 biasing force of the attachment means 14 on the substrate 3. The course of the contact force can be adjusted for example by the distance between the magnet of the magnetic field source 65 and the working piston 8 or via different strong magnets.

Claims (10)

1. Hand-held or semi-stationary setting tool (1; 41; 61) for driving fastening elements into a base (3) using a working piston (8), with a housing, which comprises an attachment (14) at an outlet end (5), characterised in that the working piston (8) is connected to the attachment (14), in which when driving a fastening element into the base (3) energy may be taken from the working piston (8) and transferred to the attachment (14) in order to press the attachment (14) against the base (3).
2. Hand-held or semi-stationary setting tool according to claim 1, characterised in that the working piston (8) is connected to the attachment (14) via a spring device (20).
3. Hand-held or semi-stationary setting tool according to claim 2, characterised in that the spring device (20) comprises at least an elastomer spring, a spiral spring (21), a plate spring and/or a fluid spring.
4. Hand-held or semi-stationary setting tool according to one of the previous claims, characterised in that the working piston (8) is connected to the attachment (14) via a friction and/or clamping device (45).
5. Hand-held or semi-stationary setting tool according to claim 4, characterised in that the friction and/or clamping device (45) is made and arranged so that when driving in a fastening element a part of an axial driving in force is transferred from the working piston (8) to the attachment (14).
6. Hand-held or semi-stationary setting tool according to one of claims 4 and 5, characterised in that the friction and/or clamping device (45) is made and arranged so that the working piston (8) is not or only insignificantly prevented from returning after a driving in process.
7. Hand-held or semi-stationary setting tool according to one of the previous claims, characterised in that the working piston (8) is connected to the attachment (14) via a source of a magnetic field (65).
8. Hand-held or semi-stationary setting tool according to claim 7, characterised in that the source of a magnetic field (65) is integrated into a guide body (16) for guiding the fastening elements at the outlet end (5).
9. Hand-held or semi-stationary setting tool according to one of the previous claims, characterised in that the attachment (14) is combined with a guide device (18) for guiding the fastening elements at the outlet end (5).
10. Method for operating a hand-held or semi-stationary setting tool for driving fastening elements into a base (3) using a working piston (8), with a housing, which comprises an attachment (14) at an outlet end (5), characterised in that when driving a fastening element into the base (3) energy is taken from the working piston (8) and transferred to the attachment (14) in order to press the attachment (14) against the base (3).

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