EP1306171A1 - Electrically operated nailing device including a safety device - Google Patents

Abstract

In horizontal use, The motor (6) is seated on the horizontally-moving impact rod (9), in the shaft of the hollow casing (3). The motor drive shaft is guided by a recess of the firing rod (8). This has a recess on its lower side and is supported against the firing spring (2). Integrated into the handle, the spring-loaded release mechanism (1) is connected above to a safety- and thrust rod (4) with a safety spring (5). When the latter is tensioned, the spring (2) is engaged in the recess and the firing rod is arrested. The magazine casing (10) is connected low into the casing shaft, ahead of the safety- and thrust rod (4).

Description

The invention relates to a device for fixing and placing holding elements on surfaces, this is done by means of an electrically operated tension spring in a pistol-like Device is carried out.

Basically, nail guns and nail guns with pneumatic or cartridge-like Drive sources known for many years. These devices make simple and light devices, with the help of which holding elements are driven into any surface can. Since the use of pneumatically operated devices requires separate compressed air sources, their use in the construction industry can only be realized with great effort and therefore not relevant. In contrast, have been cartridge-driven Devices are largely implemented on construction sites, but they require one always sufficient supply of cartridges and consistent compliance with occupational safety aspects and require compliance with noise protection regulations. Due to the high consumption of cartridges, these devices are also relatively expensive to maintain.

In addition, electrically powered devices are known in which either a coil directly actuated a ramming device or a firing pin with a ferromagnetic plunger is connected to a magnetic coil, using an electromagnetic tension a return of a return spring is achieved (DE-OS 2 238 440). Both devices have themselves due to their susceptibility to faults, the cumbersome handling and the relatively high Cannot enforce costs on the market. Adapted to the specific conditions Driving in holding elements is not possible. The workers cannot use the devices manage and operate with one hand. A double security lock against accidental There is no trigger.

DE-OS 44 33 746 A1 describes a device for driving in nails, in which a main body filled with hydraulic fluid serves a drive tip, in which a short, tight spring with a small path is used for pretensioning and the nails via a groove and a push-in hole in the Wall driven.
The nail magazine is attached to the side of a tip guide and brings the nails into this guide. An angled contact arm attached to the tip guide serves as the trigger and is actuated via a trigger.

The device can only normal nails in relatively soft due to the low spring preload Drive in building materials. By using a hydraulic fluid in the main body the device is difficult and difficult to handle. Driving in nails is not adaptable to the application. Operation with only one hand is not possible. The device does not have a double trigger lock.

From DE-OS 25 01 539 a setting device for holding elements is known which has a housing and contains a driving device which moves back and forth in the housing in the axial direction, wherein the driving device is an elongated ramming device, a guide shaft and includes a radially extending flange which is between the ram and the leadership shaft is arranged. With the driving device is a first helical Cam element firmly connected. The ram extends coaxially the cam element. In the extension of the first cam element is a second one helical cam element which is fixedly connected to a ring gear. This element is also provided with a hollow hole through which the ramming device passes can move through. A pinion engages in the ring gear, which over a Shaft and gearbox connected to an engine. The motor moves over the pinion the slewing ring of the second cam element for vertical lifting of the first cam element, which tightens a spring over its flange, which the ramming device after Trigger suddenly with the holding element moved from and this into the material one rubs.

The device has no second protection against unintentional triggering. There is no variable option for driving the holding elements into the wall.
Known is an electromagnetically operated device for driving fasteners into a workpiece with a release lock to avoid the unwanted triggering of drive-in shocks as soon as the device is lifted off the workpiece, this being done by a photo-electric switch for interrupting the electrical pulse triggered by the actuation switch Excitation of the solenoid should be triggered (DE 33 23 665). The design of the locking mechanism is based on a purely photoelectric basis and is prone to failure. The corresponding signals are transmitted by means of a transmitter and receiver system integrated in a fork-shaped holder. The device does not implement automatic tensioning when the trigger mechanism is actuated.

It is known to use spindle-shaped drives in automatic nailing machines which implement the clamping process (US Pat. No. 3,810,572, US Pat. No. 3,982,678). However, this technically constructive design of the clamping mechanism ultimately represents a well-known embodiment. The nailing device cannot be secured against unintentional triggering.
Ultimately, a device for nailing cable clips and in combination with laterally chained nails is known (DE-OS 2 109 537). Although the device is intended to make it easier to work with one hand, it is susceptible to faults and has never become established in practice. The writing has no information on the actual pistol and its structure.

• der eine Antriebswelle aufweisende elektrische Motor (6) im schaftartigen Gehäuse (3) auf einem horizontal beweglichen und mit Hubelementen versehenen Anschlagdorn (9) aufsitzt, wobei die Antriebswelle des Motors (6) durch eine hohle, Arretiermöglichkeiten aufweisende Ausnehmung des Abschussdorns (8) geführt und der an seiner Unterseite eine Einkerbung/Aussparung besitzende Abschussdorn (8) gegen die Abschussfeder (2) abgestützt ist
• und der im Griff der Vorrichtung integrierte, Rückholfedern aufweisende Auslösemechanismus (1) mit einen, an seiner Oberseite eine Sicherungsfeder (5) besitzenden Sicherungs- und Vorschubdorn (4) verbunden ist, wobei die Sicherungsfeder (5) im gespannten Zustand der Abschussfeder (2) in die Einkerbung/ Aussparung des Abschussdorns (8) eingreift sowie diesen arretiert und
• das Magazingehäuse (10) vor dem Sicherungs- und Vorschubdorn (4) im unteren Bereich des schaftartigen Gehäuses eingebunden ist.

The object of the invention is to remedy the disadvantages of the prior art and to provide a technical aid in one-hand operation with which the device can be automatically tensioned before the materials / lines (29) to be attached to the respective surface are fixed and material / line damage and independent triggering can be avoided. The design is intended to ensure that the device automatically switches to an operational state after the trigger device has been actuated.
The use of two separate aids (e.g. nail and clamp) should be eliminated. This is achieved according to the invention in that with the horizontal driving direction

• the electric motor (6) having a drive shaft is seated in the shaft-like housing (3) on a horizontally movable stop pin (9) provided with lifting elements, the drive shaft of the motor (6) being guided through a hollow recess in the launching pin (8) with locking possibilities and the firing pin (8) having a notch / recess on its underside is supported against the firing spring (2)
• and the release mechanism (1) integrated in the handle of the device and having return springs is connected to a safety and feed pin (4) which has a safety spring (5) on its upper side, the safety spring (5) being in the tensioned state of the launch spring (2) engages in the notch / recess of the launching pin (8) and locks it and
• the magazine housing (10) is integrated in front of the safety and feed mandrel (4) in the lower area of the shaft-like housing.

The firing pin (8) has pins / teeth (28) on its lower running surface in the horizontal driving-in direction, which enable the drive shaft to snap into place. The drive shaft of the motor (6) running through the launching pin (8) is provided with a spindle-shaped surface structure.
The launching pin (8) is a solid component. A bore is provided in the launching pin (8) for the receiving area of the drive shaft with motor (6). Pins / teeth (28) are integrated in this hole so that the launching pin (8) is carried along by the drive shaft of the motor (6) to tension the launching spring (2) when the pins / teeth (28) snap into the spindle-shaped drive shaft the motor (6) is guaranteed.

The magazine housing (10) accommodating the magazine (25) has a lower limit with a hinged magazine cover (26).

• mit einer definierten Tiefe
• sowie an den jeweiligen Untergrund speziell angepasst und
• ohne Beschädigungen der Materialien/Leitungen (29)

einzutreiben. The magazine (25) has in a vertical central arrangement a spring channel (14) with a magazine spring (13), the magazine spring (13) actuating a pressure plate (12) running in the magazine (25) when the magazine (25) is loaded with holding elements.
The holding elements are preferably designed as T-shaped nails. These special nails ensure that the materials / lines (29) and / or other components to be fastened can be fastened exactly in their position and without damage.
The pressure plate (12) of the magazine (25) has an outer loading tab which is arranged on the outside of the magazine (25) and is guided in a slot in the longitudinal direction, both in the magazine housing (10) and in the magazine (25).
A particular advantage of the solution according to the invention is the possibility of the fastening elements (16)

• with a defined depth
• and specially adapted to the respective surface and
• without damage to the materials / lines (29)

collect.

• Der jeweilige Bediener kann aufgrund der leichten Bauweise des Gerätes und der Möglichkeit eines automatischen und selbstständigen Ladens der Abschusseinrichtung sowie einer genauen Fixierung der zu befestigenden Leitung über den vertikalen Führungsdorn eine exakte Positionierung vornehmen.
• Durch die erfindungsgemäß zweifache und unabhängige Sicherung des Gerätes gegen unbeabsichtigtes Auslösen ist eine bedeutende Erhöhung des Arbeitsschutzes gegeben. Ein unbeabsichtigtes Auslösen ist praktisch nicht mehr möglich.
• Es wird gewährleistet, dass Materialien/Leitungen (29) befestigt werden können, ohne dass der T-förmige Nagel (16) in das zu befestigende Material eindringen bzw. dieses beschädigen kann.

According to the invention, the device is adapted to the special application in the case of different line thicknesses by the special arrangement and design of the vertical guide mandrel (17) and the horizontally guided stop mandrel (9) (see FIG. 4) in their combinatorial connection.
The guiding mandrel (17) has the task of enabling the exact positioning of the holding element (16) and thus avoiding damage to materials / lines (29). In order to avoid an automatic triggering of a driving-in process, the special design and positioning of the stop mandrel (9) according to the invention has been undertaken.
The drive-in process takes place only when the stop mandrel (9) sits on the element to be fixed and is flush with the gun mouth, and the trigger (19) is actuated. The stop mandrel (9) can only be flush with the gun mouth if the guide dome (17) is positioned on the material in such a way that the stop mandrel (9) can move.
The compression spring (15), which does not act as a safety spring, has the task of pushing the stop pin (9) into its starting position by counterpressure. The drive shaft with motor (6) is now back in the pins / teeth (28) of the firing pin (8) and the pistol cannot be inadvertently triggered. This is only possible if the trigger (19) is actuated, the depth of the guide mandrel (17) is overcome and the launching mandrel (8) is moved in the full distance against the pressure spring (15) by counter pressure. According to the invention, the effects are achieved in particular by the special T-shaped arrangement of the stop and guide mandrel.
Further advantages of the invention are:

• Due to the light construction of the device and the possibility of automatic and independent loading of the launcher as well as a precise fixation of the line to be fastened, the respective operator can perform an exact positioning via the vertical guide mandrel.
• The inventive double and independent securing of the device against unintentional triggering provides a significant increase in occupational safety. Accidental triggering is practically no longer possible.
• It is ensured that materials / lines (29) can be fastened without the T-shaped nail (16) penetrating or damaging the material to be fastened.

• Das Gerät benötigt lediglich einen 220 V-Anschluss mit einer geringen Netzabsicherung oder wahlweise einen Akku.
• Es wird durch die hohe Montageleistung eine nennenswerte Steigerung der Arbeitsproduktivität erreicht.
• Die verwendeten Halteelemente sind konstruktiv unkompliziert, aber sehr wirkungsvoll aufgebaut.
• Das speziell entwickelte Magazin gewährleistet ein schnelles und automatisches Nachladen der Halteelemente.
• Die erfindungsgemäße Vorrichtung arbeitet vergleichsweise sehr leise und führt somit zu keiner nennenswerten Lärmbelästigung mehr.
• Aufgrund des konstruktiven Aufbaus der Vorrichtung können keine Materialien/Leitungen (29) mehr beschädigt werden.
• Das Gerät ist ohne Vorbereitungszeit sofort einsetzbar.
• Ein unbeabsichtigtes Auslösen des Gerätes beim Herunterfallen, ist durch die Kombination von zwei unabhängig voneinander wirkenden Sicherungs-Mechanismen (• Führungsdorn / Anschlagdorn sowie
     • Abzug / Sicherungs- und Vorschubdorn / Abschussdom).
  nicht möglich. Dies erhöht den Sicherheitsstandard des Gerätes erheblich.

The fastening and holding elements used in practice consist of two components, a constructional simplification is ensured according to the invention by the T-shaped design of the holding element [one component as a T-shaped nail (16)].

• The device only requires a 220 V connection with a low level of mains protection or, alternatively, a battery.
• Due to the high assembly performance, a notable increase in labor productivity is achieved.
• The holding elements used are structurally uncomplicated, but very effective.
• The specially developed magazine ensures fast and automatic reloading of the holding elements.
• The device according to the invention operates comparatively very quietly and therefore no longer leads to any significant noise pollution.
• Due to the design of the device, no more materials / lines (29) can be damaged.
• The device can be used immediately without preparation time.
• An unintentional triggering of the device when falling down is due to the combination of two independently acting safety mechanisms (• guide mandrel / stop mandrel as well
  • Deduction / safety and feed mandrel / shooting dome).
  not possible. This significantly increases the safety standard of the device.

• Fig. 1 - die Vorrichtung mit Magazingehäuse und bestückten Magazin im Längsschnitt
• Fig. 2 - das Magazingehäuse und das Magazin im Längsschnitt mit und ohne H Halteelemente sowie das Magazin und die Druckplatte in der Draufsicht
• Fig. 3 - die Einzelteile der Vorrichtung im Längsschnitt
• Fig. 4 a - Darstellung des Funktionsprinzips des Zusammenwirkens von Motor mit Antriebswelle und Abschussdorn
• Fig. 4 b - Draufsicht der Mündung mit Innenleben
• Fig. 4 c - Draufsicht der Mündung auf Leitung

The invention will be explained in more detail below using an exemplary embodiment. Show:

• Fig. 1 - the device with magazine housing and loaded magazine in longitudinal section
• Fig. 2 - the magazine housing and the magazine in longitudinal section with and without H holding elements and the magazine and the pressure plate in plan view
• Fig. 3 - the individual parts of the device in longitudinal section
• Fig. 4 a - representation of the functional principle of the interaction of the motor with the drive shaft and launching pin
• Fig. 4 b - top view of the mouth with inner life
• Fig. 4 c - top view of the mouth on line

The device constructed as a tool for one-hand operation (FIG. 1) has the handle (18) Trigger mechanism (1) and the trigger (19). The trigger mechanism (1) overlaps the safety and feed dome (4) together with the safety spring (5) and the notch / recess (22) in the mode of operation of the launching pin (8). On the backup and feed mandrel (4) the securing spring (5) is fastened in the tensioned state a lock engages in the notch / recess (22) of the launching dome (8). The launching pin (8) has a recess, not shown, for the passage of the drive shaft the engine (6). In the lower tread of the launcher recess (8) pins / teeth (28) are integrated. The drive shaft of the motor (6) is spindle-shaped Surface structure equipped. The electric motor (6) is shaft-like at the top Housing (3) is supported by a counter spring (7) and points at its lower Side rolling devices (23) on the lifting elements (24) of the dome (9) seated. The stop mandrel (9) is supported on the handle (18) by means of the compression spring (15) and executed longitudinally. The launch spring (2) is guided above the stop mandrel (9), which is attached to the launching pin (8) and the front end of the housing (3). The magazine housing (10) is in the lower area in front of the safety and feed mandrel (4) of the shaft-like housing (3) integrated.

The magazine housing (10) according to Fig. 2 is down through the hinged magazine cover (26) limited. The magazine (25) is inserted into the magazine housing (10) and by means of Magazine cover (26) locked. On the magazine / base (25) sits in the spring channel (14) guided magazine spring (13), which are designed as special steel nails with a T-shaped head Pushes holding elements (16) into the shaft-like housing (3). The magazine (25) has also an elongated slot for receiving the outer loading tab of the pressure plate (12). The guide dome (17) is the front stop of the shaft-like housing (3). executed (Fig. 4 a, b, c). In the rear area of the handle (18) is the electrical connection (11) integrated.

operation

The tool works exclusively with electrical current (220 V or battery). is the power supply is assured, work can begin immediately.

The motor (6) moves a drive shaft (6) with a spindle-shaped surface structure, which runs through the launching pin (8). Pins / teeth (28) are integrated in the lower running surface of the launching pin (8), which enable the drive shaft of the motor (6) to snap into place. This engagement is only possible if the stop mandrel (9) is not pressed horizontally against the compression spring (15) into the shaft-like housing (3). If the drive shaft of the motor (6) engages in the inner guide of the launching pin (8), it is moved against the spring force of the launching spring (2), so that it is tensioned. In order to prevent accidental triggering of the device, the launching pin (8) is secured by the engagement of the locking spring (5) in the notch / recess (22) according to FIG. 3 and the latter is blocked. The second and completely independent trigger protection of the device according to the invention is provided in that triggering is only possible if, in addition to actuating the trigger mechanism (1) via the trigger (19), the compression spring (15) is compressed by pressing the stop mandrel ( 9) to the corresponding surface. Actuating the trigger (19) and thus the trigger mechanism (1) without pressing the stop mandrel (9) and vice versa will never trigger the device.
If the stop dome (9) is pressed against the surface, it moves backwards in the shaft-like housing (3) against the driving direction and compresses the compression spring (15). At the same time, the lifting elements (24) of the stop mandrel (9) slide under the rolling devices (23) of the motor with drive shaft (6) and lift them against the counter spring (7) (1st stage of unlocking has taken place). The second stage of unlocking is canceled by pulling the trigger (19). As a result, the safety and feed mandrel (4) is moved in the driving-in direction, the safety spring (5) disengages from the notch / recess (22) and the launching mandrel (8) is completely released. The firing pin (8) can thus move the T-shaped nail (16) by the force of the firing spring (2) and drive it into the surface between the materials / lines (29). The T-shaped nail (16) is only driven in to such a depth that it in no way destroys or squeezes the materials / lines (29). This is achieved according to the invention by the special design of the guide mandrel (17) and the stop dome (9). The guide mandrel (17) is placed between or next to the line to be fixed, the stop mandrel (9) is placed on the element / line to be fastened. The interaction of the horizontal stop mandrel (9) and the vertical guide mandrel (17) ensures that it is not possible to shoot into the materials / lines (29) or that a shot is triggered unintentionally. The distance that the launching pin (8) travels to the inner housing stop (27) corresponds exactly to the nail length without the crossbar. After the shot, this crossbar is always flush in the gun mouth, so that the materials / lines (29) cannot be squeezed.

Simultaneously with the driving of the T-shaped nail (16) into the surface, the securing and feed mandrel (4) in cooperation with the magazine spring (13) a new one Nail into the shaft-like housing (3) and after tensioning the launching spring in front of the launching pin (8th). If the device is now taken off the surface, the dome moves (9) by the force of the compression spring (15) in its starting position. The motor (6) lowers itself with the drive shaft, so that the pins / teeth (28) of the launching pin (8) snap into the spindle-shaped surface structure of the drive shaft of the motor (6) and move it against the spring force of the launch spring (2) in the starting position.

3 shows a compilation of the individual parts of the device for better understanding in longitudinal section.

Fig. 4 a shows the interaction of the pins / teeth (28) of the launching dome (8) with the spiral surface structure of the drive shaft of the motor (6). In Figures 4 b and 4 c is the special arrangement of the stop mandrel (9) / guide mandrel from the muzzle point of view (17) and the T-shaped nail (16) in the unattached and in this example to one Electric line (29) shows the attached state. It can be clearly seen how the Guide dome (17) between the two legs of the electrical line (29) is to be placed, thus avoiding an injury to this line on the one hand and overlapping on the other both legs are reached by the T-shaped nail (16).

List of the reference symbols used

1 -

trigger mechanism

2 -

Shooter spring

3 -

shaft-like housing

4 -

Safety and feed dome

5 -

securing spring

6 -

Motor with drive shaft

7 -

counter spring

8th -

launch Dorn

9 -

stop Dorn

10 -

magazine case

11 -

Electrical connection

12 -

Pressure plate with outer loading pocket

13 -

magazine spring

14 -

spring channel

15 -

compression spring

16 -

T-shaped nail

17 -

guide pin

18 -

Handle

19 -

deduction

20 -

feather

21 -

feather

22 -

Indentation / recess

23 -

rolling device

24 -

lifting elements

25 -

magazine

26 -

magazine cover

27 -

housing stop

28 -

Pins / teeth

29 -

Materials / lines

Claims (6)

Device for fixing and placing holding elements on surfaces, an electric motor being used and the device preferably in a pistol-like design with a handle having a trigger mechanism, a shaft contained in a shaft-like housing and a firing pin to be tensioned by a spring and fastened to the shaft-like housing Magazine housing is designed, characterized in that with a horizontal driving direction the electric motor (6) having a drive shaft is seated in the shaft-like housing (3) on a horizontally movable stop pin (9) provided with lifting elements, the drive shaft of the motor (6) being guided through a hollow recess in the launching dome (8) which has locking possibilities and the firing pin (8) having a notch / recess on its underside is supported against the firing spring (2) and the release mechanism (1) integrated in the handle of the device and having return springs is connected to a securing and feed dome (4) having a securing spring (5) on its upper side, the securing spring (5) in the tensioned state of the launching spring (2) engages in the notch / recess of the launching pin (8) and locks it and the magazine housing (10) is integrated in front of the safety and feed mandrel (4) in the lower area of the shaft-like housing. Device according to claim 1, characterized in that the launching dome (8) has pins / teeth (28) on its lower running surface in the horizontal driving-in direction as a locking possibility. Device according to claims 1 and 2, characterized in that the drive shaft of the motor (6) is provided with a spindle-shaped surface structure. Device according to Claims 1 to 3, characterized in that the magazine housing (25) accommodating the magazine housing (10) has a magazine cover (26) provided with a hinge as the lower boundary and a spring channel (14) having a magazine spring (13) in a vertical central arrangement , wherein the magazine spring (13), when the magazine (25) is loaded with holding elements, actuates a pressure plate (12) running in the magazine. Apparatus according to claim 4 and 5, characterized in that the holding elements are preferably designed as T-shaped nails (16). Apparatus according to claim 4, characterized in that the pressure plate (12) has an outer loading tab which is arranged on the outside of the magazine (25) and is guided in a housing slot in the longitudinal direction.

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