Driving device

Abstract

According to one aspect of the invention, an apparatus for driving a fastening element into a substrate comprises: a mechanical energy-storage means for storing mechanical energy; and an energy-transmission element, which can be moved along a placement axis and in a driving-in direction between a starting position and a placement position, for transmitting energy from the mechanical energy-storage means to the fastening element. The energy-transmission element has an end which is to the rear in the driving-in direction. The mechanical energy-storage means comprises a first cylindrical container and a first piston, the first cylindrical container defining a first cylinder axis and the first piston being arranged so as to be movable along the first cylinder axis in the first cylindrical container such that the first piston seals off a partial volume of the first cylindrical container and a gas arranged in the sealed off partial volume of the first cylindrical container forms a gas spring. The apparatus also comprises a force-transmission device which transmits a spring force from the first gas spring to the rear end of the energy-transmission element, the rear end of the energy-transmission element being arranged downstream of the first piston in the driving-in direction, when the energy-transmission element is arranged in the starting position.

Description

Technical area

[0001] The application relates to a device for driving a fastening element into a substrate. State of the art

[0002] In such devices, for example from TW 201607703 A, it is known to temporarily store mechanical energy in a mechanical energy storage device and transfer it abruptly to a fastening element. Typically, an energy transfer element, for example in the form of a piston, is used for this purpose. This element is arranged between the mechanical energy storage device and the fastening element in a driving direction and moves back and forth. The dimensions of such devices in the driving direction are therefore relatively large. In some applications, it is desirable to provide a device with reduced dimensions. Description of the invention

[0003] The object is achieved in a device for driving a fastening element into a substrate, comprising a mechanical energy storage device for storing mechanical energy and an energy transmission element movable along a setting axis and in a driving direction between an initial position and a setting position for transmitting energy from the mechanical energy storage device to the fastening element, wherein the energy transmission element has a rear end in the driving direction, wherein the mechanical energy storage device has a first cylindrical container and a first piston, wherein the first cylindrical container defines a first cylinder axis and the first piston is arranged in the first cylindrical container so as to be movable along the first cylinder axis,so that the first piston closes off a partial volume of the first cylindrical container, and a gas disposed in the closed partial volume of the first cylindrical container forms a first gas spring. The device further comprises a force transmission device that transmits a spring force of the first gas spring to the rear end of the energy transmission element, and the rear end of the energy transmission element is arranged behind the first piston in the driving direction when the energy transmission element is arranged in the initial position. Due to the transmission of the spring force of the first gas spring to a location behind the first piston, it is possible to reduce the space required by the device in the driving direction. Preferably, the first cylinder axis runs parallel to the setting axis.

[0004] The device further comprises a roller train, which has a first roller holder with a first roller and a belt running around the first roller. The first roller holder is mechanically connected to the first piston and transmits a movement of the first piston to the belt, and the belt rests against the rear end of the energy transmission element. Under certain circumstances, the belt dampens the impact accelerations of the energy transmission element and / or the device relative to the gas springs and their seals, thus increasing the service life of the device.

[0005] An advantageous embodiment is characterized in that the rear end of the energy transmission element is arranged in front of the first piston in the driving direction when the energy transmission element is in the setting position. This means that the energy transmission element travels a greater distance on its path from the starting position to the setting position in the driving direction than the first piston, which may further reduce the space required by the device. The lower speed of the first piston may reduce the load on its seals, which are thus subject to less wear.

[0006] An advantageous embodiment is characterized in that the mechanical energy storage device has one or more further cylindrical containers and one or more further pistons, wherein the further cylindrical containers each define a further cylinder axis and the further pistons are arranged in the respective further cylindrical container so as to be movable along the respective further cylinder axis, so that the further pistons each close off a partial volume of the respective further cylindrical container and a gas arranged in the respective closed partial volume of the respective further cylindrical container forms a further gas spring, and wherein the force transmission device transmits a spring force of the further gas springs to the rear end of the energy transmission element. The further cylinder axes preferably run parallel to the setting axis.Likewise, the first and all subsequent cylinder axes are preferably arranged evenly distributed around the setting axis. This reduces or prevents tilting moments that may otherwise occur during force transmission from the gas springs to the energy transmission element. Alternatively or additionally, the gas springs are pneumatically connected to one another. The associated pressure equalization between the gas springs also counteracts potential tilting moments.

[0007] An advantageous embodiment is characterized in that the device comprises an energy transmission device for transmitting energy from an energy source to the mechanical energy storage device. The device preferably comprises the energy source. Particularly preferably, the energy source comprises an electric battery.

[0008] An advantageous embodiment is characterized in that the energy transmission device comprises a motor and a motion converter for converting a rotary motion of the motor into a linear motion of the first piston with a rotary drive and a linear output, wherein the motion converter is preferably arranged on the setting axis. The motion converter preferably comprises a spindle drive driven by the motor, comprising a threaded spindle and a spindle nut. Alternatively, the motion converter comprises a drum roller driven by the motor, onto which a rope or belt, preferably the belt of the pulley system, is wound.

[0009] An advantageous embodiment is characterized in that the device comprises a coupling device for temporarily holding the energy transmission element in the starting position, wherein the coupling device is preferably arranged on the setting axis. The coupling device preferably has an open and a closed state, wherein the coupling device temporarily holds the driving element in the starting position when the coupling device is closed. Examples of implementation

[0010] 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: Fig. 1 a side view of a driving device, Fig. 2 a side view of the driving device with the housing open, Fig. 3 schematically a drive and an energy transmission element in a tensioned state, Fig. 4 the drive of Fig. 3 in a relaxed state, Fig. 5 schematically shows a drive and an energy transmission element in a tensioned state, Fig. 6 the drive of Fig. 5 in a relaxed state and Fig. 7 a drive with an energy transmission element.

[0011] Fig. 1shows a side view of a driving device 10 for driving a fastening element, for example a nail or bolt, into a substrate. The driving device 10 has a power transmission element (not shown) for transmitting power to the fastening element, as well as a housing 20 in which the power transmission element and a drive device (also not shown) for conveying the power transmission element are accommodated.

[0012] 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.

[0013] Fig. 2shows the driving device 10 with the housing 20 open. A drive device 70 for conveying an energy transmission element (not shown in the drawing) is accommodated in the housing 20. The drive device 70 comprises an electric motor (not shown) for converting electrical energy from the battery 590 into rotational energy, a torque transmission device comprising a gear 400 for transmitting a torque from the electric motor to a motion converter embodied as a spindle drive 300, a force transmission device comprising a roller train 260 for transmitting a force from the motion converter to a mechanical energy storage device embodied as a gas spring 200, and for transmitting a force from the gas spring 200 to the energy transmission element.

[0014] Figs. 3 and 4schematically show a drive 310 designed as a mechanical energy storage device and an energy transmission element 320 designed as a setting piston with a rear end 321. The drive 310 comprises a first cylindrical container 330, which defines a first cylinder axis, and a first piston 340, which is arranged in the first cylindrical container 330 so that it can move along the first cylinder axis. The first piston 340 closes off a partial volume of the first cylindrical container 330, so that a gas, for example air, arranged in the closed partial volume of the first cylindrical container 330 forms a first gas spring 350. The drive 310 further comprises a further cylindrical container 360, which defines a further cylinder axis, and a further piston 370, which is arranged in the further cylindrical container 360 so that it can move along the further cylinder axis.The further piston 370 closes off a partial volume of the further cylindrical container 360, so that a gas, for example air, arranged in the closed partial volume of the further cylindrical container 360 forms a further gas spring 350.

[0015] The drive 310 has a force transmission device, preferably designed as a rigid linkage 390, which transmits a spring force of the first gas spring 350 and the further gas spring 380 to the rear end 321 of the energy transmission element 320. As a result, the energy transmission element 320 is accelerated along a setting axis 410 in a driving direction 420 and moved toward a fastening element (not shown). Advantageously, the first cylinder axis and the further cylinder axis run parallel to the setting axis 410. Furthermore, the first cylinder axis and the further cylinder axis are arranged opposite one another with respect to the setting axis 410, i.e., evenly distributed around the setting axis 410.

[0016] The energy transfer element 320 is located in Fig. 3 in its initial position and in Fig. 4 in its set position, i.e., after a driving-in process. In both positions, the rear end 321 of the energy transmission element 320 is arranged in the driving-in direction 420 behind a front end face of the first piston 340 and a front end face of the further piston 370. In embodiments not shown, the rear end of the energy transmission element is arranged in the driving-in direction behind the complete first piston and / or behind the complete further piston.

[0017] Figs. 5 and 6schematically show a drive 510 designed as a mechanical energy storage device and an energy transmission element 520 designed as a setting piston with a rear end 521. The drive 510 comprises a first cylindrical container 530, which defines a first cylinder axis, and a first piston 540, which is arranged in the first cylindrical container 530 so that it can move along the first cylinder axis. The first piston 540 closes off a partial volume of the first cylindrical container 530, so that a gas, for example air, arranged in the closed partial volume of the first cylindrical container 530 forms a first gas spring 550. The drive 510 further comprises a further cylindrical container 560, which defines a further cylinder axis, and a further piston 570, which is arranged in the further cylindrical container 560 so that it can move along the further cylinder axis.The further piston 570 closes off a partial volume of the further cylindrical container 560, so that a gas, for example air, arranged in the closed partial volume of the further cylindrical container 560 forms a further gas spring 550.

[0018] The drive 510 has a roller train comprising a first roller holder 630 with a first roller 640, a further roller holder 650 with a further roller 660, and a force transmission element 670 designed as a belt that runs around the first roller 640 and the second roller 660. The first roller holder 630 is mechanically connected, preferably fastened, to the first piston 540 and transmits a movement of the first piston 540 to the force transmission element 670. The further roller holder 650 is mechanically connected, preferably fastened, to the further piston 570 and transmits a movement of the further piston 570 to the force transmission element 670. The force transmission element 670, in turn, rests against the rear end 521 of the energy transmission element 520 and transmits a spring force of the first gas spring 550 and the second gas spring 580 to the energy transmission element 520.As a result, the energy transmission element 520 is accelerated along a setting axis 610 in a driving direction 620 and moved toward a fastening element (not shown). Advantageously, the first cylinder axis and the further cylinder axis run parallel to the setting axis 610. Furthermore, the first cylinder axis and the further cylinder axis are arranged opposite one another with respect to the setting axis 610, i.e., evenly distributed around the setting axis 610.

[0019] The energy transfer element 520 is located in Fig. 5 in its initial position and in Fig. 6in its set position, i.e., after a driving-in process. In the initial position, the rear end 521 of the energy transmission element 520 is arranged in the driving-in direction 620 behind a front end face of the first piston 540 and a front end face of the further piston 570. In embodiments not shown, the rear end of the energy transmission element is arranged in the driving-in direction behind the complete first piston and / or behind the complete further piston.

[0020] The force transmission element 670 is secured at its ends to a housing 680 of the driving device (not shown). As a result, a movement of the first piston 540 and the second piston 570 is transmitted to the energy transmission element 520 with a transmission factor of two. Consequently, in the set position, the rear end 521 of the energy transmission element 520 is positioned in the driving direction 620 in front of the front end face of the first piston 540 and the front end face of the further piston 570, and thus in front of the complete pistons 540, 570.

[0021] Fig. 7shows a drive 710 designed as a mechanical energy storage device and an energy transmission element 720 designed as a setting piston, which moves along a setting axis 725. The drive 710 comprises a first cylindrical container 731 with a first piston and three further cylindrical containers 732, 733, 734, each with a further piston. A gas spring is located in each of the cylindrical containers. The four gas springs are arranged evenly distributed around the setting axis 725.

[0022] The drive 710 has a roller train comprising a single roller holder 760 with a first roller 761 and a second roller 762. All four pistons are connected to the roller holder 760 in a force-transmitting manner, preferably fastened thereto. Furthermore, the roller train comprises a belt 770, which is wound around the first roller 761, a rear end (not shown) of the energy transmission element 720, the second roller 762, and two further rollers 763, 764, so that the belt 770 is designed as a circulating belt. As a result, the movement of the pistons is transmitted to the energy transmission element 720 with a transmission factor of two.

Claims

1. Apparatus for driving a fastening element into a base material, having a mechanical energy store (310) for storing mechanical energy, and an energy transmission element (320) which is movable along a setting axis and in a driving direction between a starting position and a setting position and which serves for transmitting energy from the mechanical energy store (310) to the fastening element, wherein the energy transmission element (320) has a rear end (321) in the driving direction, characterized in that the mechanical energy store (310) has a first cylindrical container (330) and a first piston (340), wherein the first cylindrical container (330) defines a first cylinder axis and the first piston (340) is arranged movably along the first cylinder axis in the first cylindrical container (330), and therefore the first piston (340) closes off a partial volume of the first cylindrical container (330), and a gas arranged in the closed-off partial volume of the first cylindrical container (330) forms a first gas spring (350), wherein the apparatus furthermore has a force transmission device which transmits a spring force of the first gas spring (350) to the rear end (321) of the energy transmission element, wherein the rear end (321) of the energy transmission element is arranged behind the first piston (340) in the driving direction when the energy transmission element (320) is arranged in the starting position, and wherein the apparatus furthermore has a roller train (260) which has a first roller holder (630) with a first roller (640) and a band (670) running around the first roller (640), wherein the first roller holder (630) is mechanically connected to the first piston (340) and transmits a movement of the first piston to the band (670), and wherein the band lies against the rear end (321) of the energy transmission element.

2. Apparatus according to Claim 1, wherein the rear end (321) of the energy transmission element (320) is arranged in front of the first piston (340) in the driving direction when the energy transmission element (320) is arranged in the setting position.

3. Apparatus according to either of the preceding claims, wherein the first cylinder axis runs parallel to the setting axis.

4. Apparatus according to one of the preceding claims, wherein the mechanical energy store (310) has one or more further cylindrical containers (360) and one or more further pistons (370), wherein the further cylindrical containers (360) each define a further cylinder axis, and the further pistons (370) are arranged movably along the respective further cylinder axis in the respective further cylindrical container (360), and therefore the further pistons (370) each close off a partial volume of the respective further cylindrical container (360), and a gas arranged in the respective closed-off partial volume of the respective further cylindrical container forms a further gas spring (380), and wherein the force transmission device transmits a spring force of the further gas springs (380) to the rear end (321) of the energy transmission element.

5. Apparatus according to Claim 4, wherein the further cylinder axes run parallel to the setting axis.

6. Apparatus according to either of Claims 4 and 5, wherein the first and all further cylinder axes are arranged distributed uniformly around the setting axis.

7. Apparatus according to one of the preceding claims, furthermore having an energy transmission device for transmitting energy from an energy source to the mechanical energy store (310).

8. Apparatus according to one of the preceding claims, wherein the energy transmission device comprises a motion converter (300) for converting a rotational movement into a linear movement with a rotary drive and a linear output, wherein the motion converter (300) is arranged on the setting axis.

9. Apparatus according to one of the preceding claims, furthermore having a clutch device for temporarily holding the energy transmission element (320) in the starting position, wherein the clutch device is arranged on the setting axis.

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