Driving tool

Abstract

A tool for driving a fastening element into a substrate, the tool comprising a spring and a driving element, also comprising a loading unit having a rotary drive, a rotary element and a tension element.

Description

[0001] Driving device

[0002] Technical area

[0003] The application relates to a device for driving a fastening element into a substrate.

[0004] State of the art

[0005] In such devices, it is known to temporarily store mechanical energy in a mechanical energy storage device and to suddenly transfer it to a fastening element. Typically, an energy transmission element, for example in the form of a piston, is used for this purpose. This energy transmission element is arranged between the mechanical energy storage device and the fastening element and moves back and forth in a driving direction. The dimensions of such devices in the driving direction are therefore relatively large. In some applications, it is desirable to provide a device in which these dimensions are reduced. In order to move the energy transmission element back, gears are known which engage with the energy transmission element designed as a rack for this purpose. In some applications, it is desirable to provide a device with high mechanical robustness.Description of the invention.

[0006] The object is achieved in a device for driving a fastening element into a substrate, comprising a spring for storing mechanical energy and a driving element which can be moved from an initial position into a setting position in order to transfer energy from the spring to the fastening element in a driving direction, further comprising a tensioning device for tensioning the spring, wherein the tensioning device has a rotary drive, a rotary element which is driven in rotation by the rotary drive, and a flexible tension element, wherein the tension element has a front end attached to the driving element and a rear end attached to the rotary element, and wherein the tensioning device is provided for winding the tension element onto the rotary element in order to convey the driving element from the setting position into the initial position.Preferably, the spring is tensioned by moving the driving element from the set position to the starting position. Because the driving element is moved by the tension element, a mechanically robust shape, for example, a circular cylindrical shape, can be selected for the remaining driving element. The tension element preferably comprises a band or a rope.

[0007] An advantageous embodiment is characterized in that the spring comprises a gas spring and the driving element comprises a piston that delimits a gas volume of the gas spring, wherein the gas spring is compressed by the movement of the driving element from the set position to the starting position. Preferably, the rotary drive, the rotary element, and / or the tension element are partially or completely arranged in the gas spring. A further advantageous embodiment is characterized in that the rotary drive comprises an electric motor and / or an electric battery. A further advantageous embodiment is characterized in that the rotary element comprises a spool or drum for winding the tension element.

[0008] An advantageous embodiment is characterized in that the tensioning device has a coupling acting between the rotary drive and the rotary element, which coupling is preferably arranged partially or completely in the gas spring. The coupling preferably comprises a wrap spring coupling. Likewise, the coupling preferably comprises a claw coupling. Particularly preferably, the rotary element comprises one or more claws of the claw coupling. Embodiments

[0009] Embodiments of a device for driving a fastener into a substrate are explained in more detail below using examples with reference to the drawings. They show:

[0010] Fig. 1 is a side view of a driving device,

[0011] Fig. 2 is a schematic representation of a driving device,

[0012] Fig. 3 is a further schematic representation of the driving device of Fig. 2,

[0013] Fig. 4 is a further schematic representation of the driving device of Fig. 2, and

[0014] Fig. 5 is a further schematic representation of the driving device of Fig. 2.

[0015] Fig. 1 shows a side view of a driving device 10 for driving a fastening element, such as a nail or bolt, into a substrate. The driving device 10 comprises a driving element (not shown) for transmitting energy from a spring (not shown) to the fastening element, as well as a housing 20 in which the driving element and a tensioning device (also not shown) for conveying the driving element are accommodated.

[0016] The driving device 10 further comprises a handle 30, a magazine 40, and a bridge 50 connecting the handle 30 to the magazine 40. A scaffold hook 60 for suspending the driving device 10 from a scaffold or the like, and an electrical energy storage device embodied as an electric battery 590 are attached to the bridge 50. A trigger 34 and a handle sensor embodied as a manual switch 35 are arranged on the handle 30. Furthermore, the driving device 10 comprises a guide channel 700 for guiding the fastening element and a pressing device 750 for detecting a distance of the driving device 10 from a substrate (not shown). Aligning the driving device perpendicular to a substrate is assisted by an alignment aid 45. In Figs. 2 to 5, a driving device 110 with a driving element 120, a spring 140 and a tensioning device 150 for conveying the driving element 120 is shown schematically.The driving element 120 comprises a piston 121, which is movable back and forth in a cylindrical, preferably circular-cylindrical, section 142 of a spring housing 141, and a driving rod 122, which is intended to strike a fastening element (not shown) in order to drive it into a substrate (also not shown). The spring 140 serves to store mechanical energy, which is transferred from the driving element 120 to the fastening element when the driving element 120 is moved in a driving direction 125 from an initial position (Fig. 4) to a setting position (Fig. 5). The spring 140 is designed as a gas spring with a gas volume 143, wherein the gas volume 143 is delimited by the spring housing 141 and the piston 121. This enables compression of the spring 140 by means of the movement of the driving element 120 from the setting position to the initial position.

[0017] The tensioning device 150 comprises an electric battery (not shown), for example the electric accumulator 590 in Fig. 1, a rotary drive 160 designed as an electric motor with a gear (not shown), a rotary element 170 designed as a coil or drum, which is driven in rotation by the rotary drive 160, a tension element 130 and a coupling 180. The rotary element 170, the coupling 180 and the tension element 130 are arranged completely in the gas volume 143 of the spring 140. The rotary drive is arranged outside the gas volume 143 and transmits rotational energy to the rotary element 170 by means of a rotary shaft 161 guided and sealed through the spring housing 141 and by means of the coupling 180. The flexible tension element 130 is designed as a band or cable and has a front end 131 attached, preferably fastened, to the piston 121 of the driving element and a rear end 132 attached, preferably fastened, to the rotary element.

[0018] The coupling 180 acts between the rotary drive 160 and the rotary element 170 in such a way that, in a closed state, it connects the rotary drive 160 to the rotary element 170 in a rotationally fixed manner, and in an open state, it allows the rotary drive 160 and the rotary element 170 to rotate freely relative to one another. For this purpose, the coupling 180 comprises a first cam disk 181 with first claws 183 designed as cams, and a second cam disk 182 with second claws 184 designed as cams. The first cam disk 181 and thus the first claws 183 are rotationally fixedly connected to the rotary drive 160. The second cam disk 182 and thus the second claws 184 are rotationally fixedly connected to the rotary element 170. In the closed state of the coupling 180 (Figs. 2 and 3), the first claws 183 are in positive engagement with the second claws 184 in the circumferential direction, so that a rotary movement is transmitted from the rotary drive 160 to the rotary element 170 and vice versa.

[0019] In the open state of the clutch 180 (Figs. 4 and 5), the first claws 183 are outwardly engaged with the second claws 184 in the circumferential direction, so that no rotational movement is transmitted from the rotary drive 160 to the rotary element 170 or vice versa. In particular, the second cam disc 182 is part of the rotary element 170, so that the rotary element encompasses the second claws 184. In embodiments not shown, the clutch is designed as a wrap spring clutch.

[0020] The tensioning device 150 is provided for winding the tension element 130 onto the rotary element 170 in order to move the driving element 120 from the set position to the starting position. For this purpose, the rotary element 170 is driven in rotation by the rotary drive 160 when the clutch 180 is closed. As a result, the piston 121 and thus the driving element 120 are moved from the set position (Fig. 2) against the driving direction 125 to the starting position (Fig. 3), so that the gas volume 143 is reduced and the spring 140 is tensioned. In the process, the tension element 130 is wound onto the rotary element 170. The rotary drive 160 or the rotary shaft 161 is advantageously provided with a freewheel so that the rotary element 170 is held in the position shown in Fig. 3 by means of the clutch 180.

[0021] Upon actuation of a trigger switch (not shown), for example the trigger 34 in Fig. 1, the clutch 180 is opened, whereby the driving element 120, driven by the spring 140, is accelerated in the driving direction 125 from the starting position (Fig. 4) into the setting position (Fig. 5). In doing so, the driving element 120 pulls the pulling element 130 at its front end 131 in the driving direction 125, so that the pulling element 130 is unwound from the rotating element 170. In the setting position, the driving element 120 strikes the fastening element and / or a buffer 190 of the driving device, which buffer comprises an elastic material, for example an elastomer. The driving device 110 is now ready to return to the state shown in Fig. 2 by closing the coupling 180 and then to return the driving element 120 to the starting position and to tension the spring 140.The invention has been explained above using several exemplary embodiments of a driving device. The described features of each exemplary embodiment are transferable to all other exemplary embodiments, individually or in combination, as long as they do not contradict each other. It should be noted that the device according to the invention can also be used for other purposes.

Claims

PATENT CLAIMS 1. Device for driving a fastening element into a substrate, comprising a spring for storing mechanical energy and a driving element movable from an initial position into a setting position in a driving direction for transferring energy from the spring to the fastening element, further comprising a tensioning device for tensioning the spring, wherein the tensioning device has a rotary drive, a rotary element driven in rotation by the rotary drive and a flexible tension element, wherein the tension element has a front end attached to the driving element and a rear end attached to the rotary element, and wherein the tensioning device is provided for winding the tension element onto the rotary element in order to convey the driving element from the setting position into the initial position.

2. Device according to claim 1, wherein the spring is tensioned by means of the movement of the driving element from the setting position to the starting position.

3. Device according to claim 2, wherein the spring comprises a gas spring and the driving element comprises a piston limiting a gas volume of the gas spring, and wherein the gas spring is compressed by means of the movement of the driving element from the setting position to the starting position.

4. Device according to claim 3, wherein the rotary drive, the rotary element and / or the tension element is arranged partially or completely in the gas spring.

5. Device according to one of the preceding claims, wherein the clamping device has a coupling acting between the rotary drive and the rotary element.

6. The device according to claim 5, wherein the clutch comprises a wrap spring clutch.

7. The device of claim 5, wherein the clutch comprises a dog clutch.

8. The device of claim 7, wherein the rotating member comprises one or more claws of the claw clutch.

9. Device according to one of claims 5 to 8, wherein the coupling is arranged partially or completely in the gas spring.

10. Device according to one of the preceding claims, wherein the tension element is a band or rope.

11. Device according to one of the preceding claims, wherein the rotary drive comprises an electric motor and / or an electric battery.

12. Device according to one of the preceding claims, wherein the rotating element comprises a spool or drum for winding the pulling element.

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