EP-4739461-A1 - 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.

Inventors

• KURTH, EMANUEL
• ROSENBAUM, ULRICH

Assignees

• Hilti Aktiengesellschaft

Dates

Publication Date

20260513

Application Date

20240613

Claims (12)

1. 1. Device for driving a fastening element into a substrate, comprising a spring for storing mechanical energy and a driving element movable from a starting position to 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 on the rotary element in order to convey the driving element from the setting position to the starting position.
2. 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. 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. 4. Device according to claim 3, wherein the rotary drive, the rotary element and/or the tension element is partially or completely arranged in the gas spring.
5. 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. 6. The device of claim 5, wherein the clutch comprises a wrap spring clutch.
7. 7. The device of claim 5, wherein the clutch comprises a dog clutch.
8. 8. The device of claim 7, wherein the rotary member comprises one or more claws of the claw clutch.
9. 9. Device according to one of claims 5 to 8, wherein the coupling is arranged partially or completely in the gas spring.
10. 10. Device according to one of the preceding claims, wherein the tension element is a band or rope.
11. 11. Device according to one of the preceding claims, wherein the rotary drive comprises an electric motor and/or an electric battery.
12. 12. Device according to one of the preceding claims, wherein the rotating element comprises a spool or drum for winding the tension element.

Description

driving device technical field The application relates to a device for driving a fastening element into a substrate. State of the art In such devices, it is known to temporarily store mechanical energy in a mechanical energy storage device and to transfer it suddenly to a fastening element. Usually, an energy transmission element, for example in the form of a piston, is used for this purpose, which is arranged in a driving direction between the mechanical energy storage device and the fastening element and moves back and forth. The dimensions of such devices in the driving direction are therefore relatively large. In some areas of application, 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 areas of application, it is desirable to provide a device with high mechanical robustness. representation of the invention The object is achieved in a device for driving a fastening element into a substrate, having a spring for storing mechanical energy and a driving element that can be moved from a starting position to a setting position in a driving direction to transfer 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 that 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 on the rotary element in order to transport the driving element from the setting position to the starting position. The spring is preferably tensioned by transporting the driving element from the setting position to the starting position. Because the driving element is moved by means of the tensioning element, a mechanically robust shape can be selected for the rest of the driving element, for example a circular cylindrical shape. Preferably, the tension element comprises a band or a rope. An advantageous embodiment is characterized in that the spring has a gas spring and the driving element has a piston that limits a gas volume of the gas spring, the gas spring being compressed by moving the driving element from the set position to the starting position. Preferably, the rotary drive, the rotary element and/or the tension element are arranged partially or completely in the gas spring. Another advantageous embodiment is characterized in that the rotary drive comprises an electric motor and/or an electric battery. Another advantageous embodiment is characterized in that the rotary element comprises a coil or drum for winding up the tension element. An advantageous embodiment is characterized in that the tensioning device has a coupling acting between the rotary drive and the rotary element, which is preferably arranged partially or completely in the gas spring. The coupling preferably comprises a wrap spring coupling. The coupling also preferably comprises a claw coupling. The rotary element particularly preferably comprises one or more claws of the claw coupling. implementation examples In the following, embodiments of a device for driving a fastening element into a substrate are explained in more detail using examples with reference to the drawings. They show: Fig. 1 is a side view of a driving device, Fig. 2 is a schematic representation of a driving device, Fig. 3 is a further schematic representation of the driving device of Fig. 2, Fig. 4 is a further schematic representation of the driving device of Fig. 2, and Fig. 5 is a further schematic representation of the driving device of Fig. 2. Fig. 1 shows a driving device 10 for driving a fastening element, for example a nail or bolt, into a substrate in a side view. The driving device 10 has a driving element (not shown) for transmitting energy from a spring (not shown) to the fastening element and a housing 20 in which the driving element and a tensioning device (also not shown) for conveying the driving element are accommodated. The driving device 10 also has 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 designed as an electrical battery 590 are attached to the bridge 50. A trigger 34 and a handle sensor designed as a hand switch 35 are arranged on the handle 30. The driving device 10 also has 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 supported by an alignment aid 45. In Figs. 2 to 5, a driving device 110 with a dri