Setting device having a braking element

Abstract

The invention comprises a working device for driving a fastening element into a substrate, comprising - a working piston guide which has a cavity, - a working piston, wherein the working piston is arranged in the working device in the cavity of the working piston guide so as to be movable along a setting axis, - a pressing device for transferring the working device from a driving-in mode into a braking mode, - a pressing sensor, wherein the pressing sensor is directly in contact with the substrate in the driving-in mode, - a pressing spring, wherein the pressing spring is connected to the pressing sensor, such that the pressing spring is tensioned in the driving-in mode and released in the braking mode, such that the pressing sensor can be moved in a setting direction of the working device, - a braking element for reducing recoil energy in the working device, wherein the braking element is contacted by the pressing device.

Description

[0001] Setting device with brake element

[0002] The present invention relates to a setting tool for driving a fastening element into a substrate, comprising a braking element for reducing recoil energy in the setting tool. Such setting tools can be operated with solid, gaseous, or liquid fuels, or also with compressed air or an electric battery.

[0003] background

[0004] Standard nailing tools are designed to drive steel nails and bolts into hard materials such as steel or concrete. In some cases, a workpiece (element) is fastened. The fastened elements can be made of sheet steel less than 2 mm thick, plastic, or even wood or plasterboard battens of varying thicknesses. When fastening thicker elements, longer nails are required because the nailing tool is positioned further away from the hard substrate, and the embedment depth must be maintained.

[0005] Nail setting devices can include an energy storage unit. This energy storage unit is able to store the required energy and, when the setting process is triggered, abruptly release it to a working piston, which then drives the nail in.

[0006] It can happen that a nail that is too long is used to fasten the element, or that a nail that is too long is driven directly into a hard surface. In such cases, the piston is slowed down considerably, and the remaining energy in the energy storage device causes recoil from the setting tool. The recoil is greater the higher the energy stored in the tool and the longer the nail.

[0007] Systems where energy is coupled into the piston over the entire or a large part of the piston stroke are particularly affected. Devices where energy coupling is completed after only a few millimeters of piston stroke (for example, devices driven by powder combustion) are less affected by this effect.

[0008] Excessive recoil can be dangerous for the user and lead to injuries. The present invention describes a way to reduce this recoil.

[0009] Methods for controlled discharge of the energy storage device upon detection of excessive recoil are too slow to react to the detected recoil. This invention offers an effective solution to this problem.

[0010] In setting tools, it is known from DE 3930592 A1 to guide the piston in a piston guide which is axially displaceable within a housing sleeve of the setting tool. To initiate a setting process, the setting tool must be pressed against a surface so that the piston guide is pressed into the housing sleeve. To dissipate piston energy in case of mis-setting or over-energy, an elastic ring is provided at the front of the piston guide at the end region facing the bolt guide, which cushions the piston.

[0011] A disadvantage of this design, however, is that if the wear on the elastic ring body becomes excessive and goes undetected, essential and expensive components of the device can be damaged. Furthermore, the piston collar, which contacts the ring body, must have the largest possible diameter to prevent premature damage to the elastic ring body. This increases the weight of the device. Additionally, due to the elasticity of the ring body, the piston rebounds after impact, which can lead to unintended piston slap, especially at high settling energies.

[0012] From DE 196 17 671 C1, a powder-powered bolt setting device with a piston arranged in a barrel guide bore is known. The piston has a piston head and a piston shaft, the piston head having a conical section on its side facing the piston shaft. Opposite this conical section of the piston, a conical receptacle is arranged at the end of the barrel front section, into which the conical section can engage in the event of a mis-setting or during a setting process with excessive energy. A damping disc arranged behind the conical receptacle in the setting direction dampens the impact of the piston.

[0013] US Patent 4,824,003 discloses a setting device in which a first rigid ring and an elastic ring are arranged one behind the other between the piston guide and the pin guide. A further rigid ring is arranged within the elastic ring, limiting the stroke of the first rigid ring. The first rigid ring has a passage for the piston stem that tapers conically in the setting direction. The piston is conically shaped at the piston collar surface facing the first rigid ring, with the contours of the conical piston surface and the conical passage of the first rigid ring complementing each other.

[0014] The object of the present invention is therefore to develop a setting device of the aforementioned type which avoids the aforementioned disadvantages and reduces the recoil of the setting device to a minimum.

[0015] Description

[0016] A first aspect of the invention comprises a working device for driving a fastening element into a substrate, comprising a working piston guide having a cavity, a working piston wherein the working piston is movably arranged in the working device along a setting axis in the cavity of the working piston guide, a pressure device for transitioning the working device from a driving mode to a braking mode, a pressure sensor wherein the pressure sensor is in direct contact with the substrate in the driving mode, a pressure spring wherein the pressure spring is connected to the pressure sensor such that the pressure spring is tensioned in the driving mode and at least partially relaxed in the braking mode so that the pressure sensor is movable in a setting direction of the working device, and a braking element for reducing recoil energy in the working device wherein the braking element is contacted with the pressure device.

[0017] The term "working piston guide" encompasses a section, area, or part of the working tool designed to guide a working piston in such a way that the working piston can move in a defined manner along a setting axis in the setting direction and in the opposite direction. The cavity within the working piston guide is used exclusively for guiding the working piston. In other words, only the working piston, and not the fastener, can be guided within the cavity of the working piston guide. However, it is possible that other sections, areas, or parts of the working tool, such as the fastener guide, may also guide the working piston.

[0018] The term "working piston" refers to a part of the working device that transfers energy from an energy storage device to the fastening element. The working piston is movable between a starting position and a set position along a set axis. Furthermore, the working piston has a rear end in the direction of insertion. The term "working piston" can refer to a working piston that is no longer in contact with the energy storage device after the energy has been transferred. Alternatively, the term "working piston" can refer to a working piston that is in contact with the energy storage device at all times.

[0019] The term "pressure device" refers to a system for detecting the distance between the tool and the surface. The pressure device comprises a pressure sensor and a pressure spring.

[0020] The term "pressure sensor" encompasses and describes a component or individual part of the pressing device. When the pressure sensor, in contact with the substrate, is pressed towards the substrate and a predefined pressing stroke is completed, the tool switches to driving mode. In other words, if the pressure sensor is not in contact with the substrate or the pressing stroke has not been fully completed, the tool is not in driving mode and no fastener can be driven into the substrate.

[0021] Alternatively, the pressure sensor of the working tool can be supplemented by a separate actuation system. The term "separate actuation system" refers to an element that is exclusively used for moving the braking element from braking mode to driving mode.

[0022] The term "driving mode" can describe a state of the tool in which a fastener can be driven into the substrate. In driving mode, the trigger of the tool can be activated, thereby driving the fastener into the substrate. In other words, driving mode can describe the starting position of the working piston—in which the driving process can be initiated. Thus, the tool is in a triggerable state.

[0023] The term "driving mode" can also describe the process - after the trigger of the working tool has been activated - when a fastening element is driven into the substrate.

[0024] The term "pressure spring" encompasses and describes a component or individual part of the pressure device. The pressure spring is connected to the pressure sensor in such a way that, in driving mode, the pressure spring is tensioned and stores energy due to the pressure exerted by the tool. This energy remains in the pressure spring as long as the tool is in driving mode. When the tool is lifted from the surface, thus ending driving mode, the pressure spring releases the stored energy back to the pressure sensor, which then switches to a different mode.

[0025] Alternatively, the clamping spring of the working tool can be supplemented by a separate return system. The term "separate return system" refers to an element that is exclusively used for returning the brake element from the driving mode to the braking mode. The term "brake element" refers to a section, area, or part of the working tool designed to reduce recoil energy within the tool. The brake element is in direct contact with the clamping device and / or parts of the clamping device—for example, the clamping sensor and / or the clamping spring. Within the scope of the invention, the term "contacted" can mean that two areas, two parts, or two sections are loosely—that is, not rigidly—in contact with each other.Within the scope of the invention, the term "contacted" can also mean that two areas, two parts, or two sections are firmly—that is, directly—connected to each other. The brake element is in contact with the clamping device in every state of the working device. In braking mode, the brake element is also in contact with the working piston, so that the working piston can be braked by the brake element.

[0026] The term "braking element" can encompass one or more braking elements. If there are multiple braking elements, they can be coordinated in such a way that a braking effect occurs synergistically, or alternatively, they can operate separately.

[0027] The term "braking mode" describes a state of the working tool in which it has left the driving mode. Within the scope of this invention, the braking mode can refer to a state in which, during the driving mode, not all of the energy of the working piston could be transferred to the fastener. This can occur, for example, if the substrate is too hard and the fastener is too long. In such a case, the working tool experiences a momentum in the opposite direction to the driving direction. Such a movement results in recoil for the user of the setting tool. Within the scope of this invention, the term "braking mode" describes a state of the working tool in which this recoil movement is reduced and minimized.

[0028] If the working piston is in contact with the energy storage device of the working tool at all times, for example via an energy transfer belt, then the impulse is transferred to the working tool. At least one technical effect of the first aspect is that the braking element decelerates the working tool early in its recoil movement as soon as it leaves the driving mode – i.e., as it is lifted from the ground. When the working tool is lifted from the ground – due to successful driving or due to the nail movement and the resulting recoil stopping – the pressure device moves the braking element in such a way that the braking element decelerates the recoil movement of the working tool at a very early stage. The deceleration of the working piston is achieved through direct contact between the braking element and the working piston.This leads to a significant reduction in recoil from the work tool.

[0029] Optionally, the working device may include an energy transfer system, wherein the energy transfer system comprises a compression element, a roller holder, an energy transfer belt, the working piston and an energy storage device for storing mechanical energy.

[0030] In a further embodiment, the invention comprises a working device wherein the braking element is arranged in a braking volume.

[0031] The term "brake volume" encompasses and describes a section, part, or component of the tool in which the braking element is integrated. The brake volume is designed so that the braking element is movable within it, allowing it to be integrated and used in both driving and braking modes. In other words, the brake volume serves to switch the tool from driving mode to braking mode, or vice versa, using the braking element.

[0032] At least one technical effect of this further embodiment is that a braking element for reducing recoil energy can be integrated into the working device through the braking volume.

[0033] Optionally, the brake volume can also include an inlet and an outlet opening for the working piston. The inlet and outlet openings are designed to be located on opposite surfaces and both encompass the positioning axis of the working tool and thus also the longitudinal axis of the working piston.

[0034] At least one further technical effect of this further embodiment is that the brake volume can additionally guide the working piston through the inlet and outlet opening, and the guidance of the working piston does not take place exclusively in the cavity of the working piston guide.

[0035] Optionally, the surfaces on which the inlet and outlet openings are arranged can be positioned perpendicular or inclined to the setting axis of the working tool and thus also to the longitudinal axis of the working piston. Preferably, the surface of the inlet opening is arranged perpendicular to the setting axis of the working tool and thus also to the longitudinal axis of the working piston, and the surface of the outlet opening is arranged inclined to the setting axis of the working tool and thus also to the longitudinal axis of the working piston.

[0036] Optionally, instead of inlet and outlet openings for the passage of the working piston, the brake volume can also include one or more openings, so that the brake element can be led out of the brake volume and contact the working piston - which in this optional embodiment is not guided through the brake volume.

[0037] In a further embodiment, the invention comprises a working device wherein the brake volume connects to the cavity of the working piston guide.

[0038] The brake volume comprises an inlet opening and an outlet opening for the passage of the working piston. The inlet and outlet openings are designed such that they are arranged on opposite surfaces and both encompass the positioning axis of the working device and thus also the longitudinal axis of the working piston. At least one technical effect of this further embodiment is that the brake element and the working piston are positioned within the brake volume, and the braking action is thereby achieved through contact between the brake element and the working piston within the brake volume.

[0039] At least one further technical effect of this further embodiment is that the brake volume can additionally guide the working piston through the inlet and outlet opening, and the guidance of the working piston does not take place exclusively in the cavity of the working piston guide.

[0040] In a further embodiment, the invention comprises a working device wherein the brake element is rotatable about a stop axis in the brake volume.

[0041] The term "stop axis" encompasses an area, preferably a longitudinal area, against which the brake element can be stopped and about which the brake element can be rotated.

[0042] Preferably, the stop axis is defined by the transition from a parallel wall – which runs parallel to the setting axis of the working tool – to a non-parallel wall – which also does not run parallel to the setting axis of the working tool. In this case, the angle between the two walls is not equal to 90°, preferably greater than 90°.

[0043] Optionally, the stop axis can be designed by a dedicated element, for example a cylinder or a cuboid.

[0044] At least one technical effect of this further embodiment is that the brake element can be rotated by means of the stop axis, thereby enabling contact between the brake element and the working piston in the brake volume.

[0045] In a further embodiment, the invention comprises a working device wherein the braking element is a brake plate, the brake plate having a stop edge. The term "brake plate" encompasses a geometry with a defined depth, width, and height and is essentially flat. The brake plate is configured such that a portion of the brake plate is in contact with the stop axis of the brake volume. Preferably, the brake plate is in contact with the stop axis of the brake volume at its stop edge.

[0046] The term "stop edge" encompasses an area of ​​the brake plate, preferably a longitudinal area, where the brake plate can be made to contact the brake volume and can be rotated in this area.

[0047] At least one technical effect of this further embodiment is that a small and defined geometry is used to transfer the working tool from the driving mode to the braking mode.

[0048] Optionally, the brake plate includes a contact area, whereby the contact area is in contact with the pressing mechanism.

[0049] The term "contact area" encompasses a defined area or several defined areas on the brake plate where the pressure sensor or pressure spring is in contact with the brake plate.

[0050] At least one technical effect of this further embodiment is that, through a defined contact area, the force transmission of the pressure sensor or the pressure spring to the brake plate takes place without a force transmission element, and thus the brake plate can be rotated directly by the movement of the pressure device in order to switch from the driving mode to the braking mode or vice versa.

[0051] In a further embodiment, the invention comprises a working device wherein the brake element has a brake opening for the passage of the working piston.

[0052] The term "brake opening" refers to a bore or other opening in the brake element for the passage of the working piston. Therefore, the term "brake opening" can encompass a cylindrical brake opening as well as any other opening shape; for example, the opening can also be rectangular.

[0053] At least one technical effect of this further embodiment is that the brake element and the working piston are positioned in the brake volume, and thus the braking mode is achieved through the contacting of the brake element and the working piston in the brake volume.

[0054] At least one further optional technical effect of this further embodiment may be that the brake opening, in addition to the brake volume and the cavity of the working piston passage, can also contribute to guiding the working piston.

[0055] The brake opening comprises a brake opening center axis, this brake opening center axis preferably running parallel to the setting axis of the working tool. This also applies, and particularly so, in the driving mode when the brake element, preferably the brake plate, is positioned perpendicular to the setting axis. In other words, in the driving mode, the brake opening center axis can be eccentric with respect to the setting axis of the working tool.

[0056] At least one further technical effect of this further embodiment is that, due to the eccentricity between the brake opening center axis and the setting axis of the working device, the brake element, preferably the brake plate, is rotatable in such a way that it is firmly contacted with the working piston in braking mode.

[0057] The brake opening also includes a brake element lever. The term "brake element lever" describes a distance from the setting axis to the stop axis.

[0058] In a further embodiment, the invention comprises a working device wherein the brake opening has two brake areas.

[0059] The term "braking area" encompasses individual points, adjacent points, or an area where the brake plate is in direct contact with the working piston. In other words, a braking area is characterized by the fact that, within or at this area, the brake plate transfers the working piston from the driving mode to the braking mode.

[0060] At least one technical effect of this further embodiment is that, by contacting the brake plate with the working piston at two defined points, the brake plate can tilt in a defined manner on the working piston, thus generating a higher braking effect. This transitions the working piston from the driving mode to the braking mode.

[0061] In a further embodiment, the invention comprises a working device wherein the two braking areas in braking mode have a clamping distance h to each other along the setting axis of the working piston.

[0062] The term "clamping distance h" refers to the distance between two braking zones along the working tool's axis of travel. When the working tool is in driving mode, the braking element is perpendicular to the longitudinal axis of the working piston. In other words, in driving mode, the working tool's axis of travel and the brake opening axis are parallel to each other, and therefore the two braking zones have no clamping distance h to each other along the working piston's axis of travel. When the working tool is in braking mode, the braking element is not perpendicular to the working piston's longitudinal axis, but is inclined. In other words, in braking mode, the working tool's axis of travel and the brake opening axis are not parallel to each other, and therefore the two braking zones have a clamping distance h to each other along the working piston's axis of travel.

[0063] At least one technical effect of this further embodiment is that the smaller the clamping distance h, the greater the braking effect. Furthermore, a smaller clamping distance h results in a smaller brake element lever a. This leads to a smaller braking volume and a smaller working tool.

[0064] In a further embodiment, the invention comprises a working device wherein the brake opening has a brake opening recess. The term "brake opening recess" encompasses a local thinning of the thickness of the brake element at the brake opening. In other words, the brake element is designed to be thinner at the brake opening than in other areas of the brake element.

[0065] At least one technical effect of this further embodiment is that, in braking mode, the clamping distance h is inherently smaller for a brake element with a brake opening recess than for a brake element without a brake opening recess. This becomes clear when a brake element with a brake opening recess and a brake element without a brake opening recess are tilted at the same angle. Due to the local thinning of the brake element's thickness at the brake opening, the brake element with a brake opening recess exhibits a smaller clamping distance h along the working piston's settling axis compared to a brake element without a brake opening recess.

[0066] At least one technical effect of this further embodiment is that the smaller the clamping distance h, the greater the braking effect. Furthermore, a smaller clamping distance h results in a smaller brake element lever a. This leads to a smaller braking volume and a smaller working tool.

[0067] In a further embodiment, the invention comprises a working device wherein the clamping distance h in braking mode has a value between 0.1 mm and 5 mm.

[0068] Preferably, the clamping distance h in braking mode has at least one of the following values:

[0069] - 0.2 mm,

[0070] 0.4 mm,

[0071] 0.6 mm,

[0072] - 0.8 mm,

[0073] 1.0 mm,

[0074] 1.2 mm,

[0075] 1.4 mm, 1.6 mm,

[0076] 1.8 mm,

[0077] - 2.0 mm,

[0078] - 2.2 mm,

[0079] 2.4 mm,

[0080] 2.6 mm,

[0081] - 2.8 mm,

[0082] 3.0 mm,

[0083] 3.2 mm,

[0084] 3.4 mm,

[0085] 3.6 mm,

[0086] 3.8 mm,

[0087] 4.0 mm,

[0088] 4.2 mm,

[0089] 4.4 mm,

[0090] 4.6 mm,

[0091] 4.8 mm,

[0092] 5.0 mm.

[0093] The clamping distance h is particularly advantageous in braking mode, with a value of 3.0 mm.

[0094] At least one technical effect of this further embodiment is that the braking effect in the working device is particularly effective within this area. Furthermore, the braking effect is increased the smaller the clamping distance h is.

[0095] In a further embodiment, the invention comprises a working device, wherein the brake element comprises a brake element longitudinal axis and the working piston comprises a working piston longitudinal axis, wherein in the driving mode the brake element longitudinal axis has an angle between 75° and 105° to the working piston longitudinal axis and / or in the braking mode the brake element longitudinal axis has an angle between 45° and 75° to the working piston longitudinal axis. The term "brake element longitudinal axis" refers to the principal axis along the greatest extent of the brake element. If the brake element is, for example, substantially rectangular, then the brake element comprises a height, a width, and a thickness. If the height has the greatest extent, then the brake element longitudinal axis is the principal axis along the height of the brake element. If the brake element is, for example, substantially cylindrical, e.g., a cylindrical disc, then the brake element comprises a thickness and an (outer) diameter.If the diameter of the cylindrical disc has the greatest extent, then the longitudinal axis of the brake element is the principal axis through the diameter of the brake element.

[0096] The term "working piston longitudinal axis" describes the axis along the setting direction of the working tool and thus also along the working piston.

[0097] Preferably, in drive-in mode, the longitudinal axis of the brake element to the longitudinal axis of the working piston has an angle which has at least one of the following values:

[0098] - 77°,

[0099] - 79°,

[0100] - 81°,

[0101] - 83°,

[0102] - 85°,

[0103] - 87°,

[0104] - 89°,

[0105] - 91°,

[0106] - 93°,

[0107] - 95°,

[0108] - 97°,

[0109] - 99°,

[0110] -101°,

[0111] - 103. Preferably, in braking mode, the longitudinal axis of the brake element to the longitudinal axis of the working piston has an angle which has at least one of the following values:

[0112] -47°,

[0113] -49°,

[0114] -51°

[0115] -53°,

[0116] -55°,

[0117] -57°,

[0118] -59°,

[0119] -61°

[0120] - 63°,

[0121] - 65°,

[0122] - 67°,

[0123] - 69°,

[0124] -71°

[0125] - 73.

[0126] At least one technical effect of this further embodiment is that the braking effect in the working device is particularly effective within these areas.

[0127] In a further embodiment, the invention comprises a working device wherein the working piston has recesses to increase the braking effect of the working device.

[0128] The term "recesses" refers to varying distances between the outer contour of the working piston and its longitudinal axis. In other words, the working piston has a grooved structure and is not – visually speaking – smooth.

[0129] At least one technical benefit of this further embodiment is that the recesses in the working piston further increase the braking effect in the implement, as the brake element makes better contact with the recesses in the working piston. At least one further technical benefit of this further embodiment is that the recesses reduce wear between the brake element and the working piston, thus extending the service life of the implement.

[0130] Optionally, the working piston can also have recesses with a contour that changes along its longitudinal axis. It is particularly advantageous if the groove contour tapers along a groove in the opposite direction to the piston's settling direction.

[0131] At least one technical effect of this optional embodiment is that, due to the changing contour of the working pistons, movement against the setting direction is also possible in braking mode.

[0132] In a further embodiment, the invention comprises a working tool wherein the recesses have at least one of the following values: a. 0.05 mm; b. 0.06 mm; c. 0.07 mm; d. 0.08 mm; e. 0.09 mm; f. 0.1 mm; g. 0.125 mm; h. 0.1 mm; i. 0.175 mm; j. 0.2 mm; k. 0.225 mm; l. 0.25 mm.

[0133] The term "recesses" refers to varying distances between the outer contour of the working piston and its longitudinal axis. For example, if a working piston has a main diameter (largest diameter) of 8.4 mm and a recess has a diameter of, say, 8.0 mm, then the recess has a value of 0.2 mm. In other words, the recess value is defined by the distance from a high point on the working piston's outer contour to a low point on the working piston's outer contour.

[0134] At least one technical effect of this further embodiment is that the retaining force between the braking element and the working piston is increased in depressions with at least one of these values. This leads to a higher braking effect and thus to a reduction in recoil in the implement.

[0135] At least one further technical effect of this additional embodiment is that the recesses in the working pistons create a clamping effect due to the resulting positive locking. This leads to a reduction in wear between the brake element and the working piston, thus increasing the service life of the implement.

[0136] In a further embodiment, the invention comprises a working device wherein the working piston has a coating to increase the braking effect of the working device.

[0137] Optionally, the invention includes a working device wherein the coating for increasing the braking effect of the working device comprises diamond particles.

[0138] At least one technical effect of this further embodiment is that the coating increases the friction between the brake element and the working piston. This leads to a higher braking effect and thus to a reduction in recoil in the implement.

[0139] A second aspect of the invention comprises a method for transitioning a working tool from a driving mode to a braking mode. The method includes the steps of: a. pressing a working tool against a surface, b. lifting the working tool from the surface, c. wherein, by lifting the working tool from the surface, a pressing device moves a braking element such that the working tool is transitioned from a driving mode to a braking mode.

[0140] At least one technical effect of the first aspect is that, as soon as the tool leaves the driving mode—that is, when it is lifted from the ground—the braking element decelerates the tool early in its recoil movement. When the tool is lifted from the ground—either due to successful driving or because the nail movement and the resulting recoil have stopped—the pressure device moves the braking element in such a way that it decelerates the tool's recoil movement at a very early stage. The deceleration of the working piston is achieved through direct contact between the braking element and the working piston. This leads to a significant reduction in the tool's recoil.

[0141] Further optional embodiments follow, which can be combined or specified arbitrarily with all previous embodiments of the first and second aspects and also with all further optional embodiments of the first and second aspects.

[0142] In a further optional embodiment, the invention comprises a working device wherein the braking element can be switched from a braking mode to a driving mode.

[0143] Before using the tool, it must be pressed against the surface. This occurs in the tool's so-called "pressing mode." If the tool is in braking mode and is initially pressed against the surface—meaning the initial contact travel is not fully overcome—the tool switches from braking mode to pressing mode. As soon as the tool transitions from braking mode to pressing mode, the braking element is not in contact with the working piston. Once the tool's full contact travel is achieved, it switches from pressing mode to driving mode. As long as the recoil has not yet overcome the contact travel (the safety distance until the braking element engages), the tool can still drive in the fastener, as it is in driving mode.Only when the contact distance has been exceeded does the contact sensor lift off the surface.

[0144] In other words, the pressure mode represents the transition mode from braking mode to driving mode.

[0145] As long as the contact distance (safety distance until the brake plate engages) has not yet been overcome by the rebound, the nail can still be driven in and the contact sensor may still be in contact with the surface.

[0146] Only when the contact distance has been exceeded does the contact sensor lift off the surface.

[0147] In a further optional embodiment, the invention comprises a working device wherein the braking element comprises at least one contact area.

[0148] The term "contact area" describes a region, such as a point, line, or surface, where the brake element is in contact with the pressure sensor and / or the pressure spring. In other words, when the tool is pressed against the surface, the movement of the pressure sensor is transferred to the at least one contact area, causing the brake element to also move. Simultaneously, the brake element transfers energy at the at least one contact area to the pressure spring, where it is stored.

[0149] At least one technical effect of this further optional embodiment is that energy is transferred from the pressure sensor to the brake element at the contact area, and energy is transferred from the brake element to the pressure spring at the contact area.

[0150] At least one further technical effect of this further optional embodiment is that when the working tool is lifted from the ground, the stored energy in the pressure spring is transferred to the braking element via the contact areas, and thus the braking element can transfer the working tool from the driving mode to the braking mode.

[0151] In a further optional embodiment, the invention comprises a working device wherein the braking element is a coil spring.

[0152] At least one technical effect of this further optional embodiment is that the coil spring makes contact with the working piston over a large area along the working piston's surface line, thus increasing the braking effect.

[0153] In a further optional embodiment, the invention comprises a working device wherein the coil spring can be moved from an open position to a closed position by the pressure device.

[0154] At least one technical effect of this further optional embodiment is that, through a movement of the pressing device - in particular through a movement of the pressing sensor - the coiling spring transfers the working tool from the driving mode to the braking mode.

[0155] In a further optional embodiment, the invention comprises a working device wherein the braking element is an eccentric brake.

[0156] At least one technical effect of this further optional embodiment is that the eccentric brake rests against the working piston in braking mode and contacts it through a clamping force.

[0157] In a further optional embodiment, the invention comprises a working device wherein the eccentric brake is rotatable about an eccentric rotary bearing by means of the pressure device.

[0158] At least one technical effect of this further optional embodiment is that, by moving the pressing device - in particular by moving the pressing sensor - the eccentric brake transfers the working tool from the driving mode to the braking mode.

[0159] Examples of implementation

[0160] The invention is explained in more detail below with reference to exemplary embodiments and the drawings.

[0161] Figure 1 shows a sectional view of a working device according to the invention.

[0162] Drive-in mode.

[0163] Figure 2 shows a sectional view of a working device according to the invention.

[0164] Braking mode.

[0165] Figure 3 shows a sectional view of a brake element according to the invention in a brake volume of a working device according to the invention in the driving mode and in the braking mode.

[0166] Figure 4 shows a first embodiment of a brake element according to the invention.

[0167] Figure 5 shows a second embodiment of a brake element according to the invention.

[0168] Figure 6 shows an embodiment of a working piston according to the invention.

[0169] Figure 1 shows a sectional view of a part of the working tool 591 according to the invention in driving mode 100. Driving mode 100 is characterized by the fact that the working tool 591 (not shown in detail here) is pressed completely against the substrate (not shown here). In driving mode, the pressure sensor 14 and the fastener guide 41 are almost congruent along the setting axis 30 of the working tool 591. By pressing the working tool 591 against the substrate, the working tool 591 is brought into a state in which the fastener 10 can be driven into the substrate. When the working tool 591 is pressed against the substrate, the pressure sensor 14 moves backwards opposite to the setting axis 30 of the working tool. The pressure sensor 14 is in contact with the braking element – ​​in this embodiment, a brake plate 18.The backward movement of the pressure sensor moves the brake plate 18 into a position perpendicular to the longitudinal axis 34 of the working piston. The brake plate 18 is positioned within the working device 591 in a brake volume 20. Within this brake volume 20, the brake plate 18 can be moved so that it is in direct contact with the working piston 15 (see Figure 2).

[0170] In driving mode 100, the working piston 15 and the brake plate 18 are not in contact. The brake plate 18 includes a brake opening 26 for the passage of the working piston. As soon as the working tool 591 switches from driving mode to braking mode (see Figure 2), the working piston 15 is contacted with the brake plate 18 in the brake opening 26.

[0171] The working piston 15 is primarily guided within the cavity 13 of the working piston guide 12. Once the working piston 15 enters the fastening guide 41 in drive-in mode, it is also guided by the fastening guide 41. The fastening guide 41 also guides the fastening element 10.

[0172] The brake plate 18 is also indirectly contacted with the pressure spring 16 via a sleeve 17. When the brake plate 18 is moved into the vertical position by the pressure sensor 14, the brake plate 18 also compresses the pressure spring 16, which temporarily stores the contact energy – caused by pressing the working tool 591 against the substrate – until the driving mode is finished and the working tool 591 switches to braking mode 200.

[0173] Figure 2 shows a sectional view of a part of a working device 591 according to the invention in braking mode. Figure 2 shows the same working device 591 according to the invention as Figure 1. Braking mode 200 is characterized in that the working device 591 (not shown in detail here) is no longer pressed completely against the substrate (not shown here). In order for the working device 591 to be pressed completely against the substrate, the contact path 43 must be overcome by pressing the working device 591 against it. This is not the case in braking mode 200 in Figure 2, since the contact sensor 14 is not almost congruent with the fastening guide 41.

[0174] When the working tool is removed from the surface – for example, by completing a setting process or due to a misplacement – ​​the contact energy stored in the pressure spring 16 is released. The pressure spring 16 expands and transfers the stored contact energy to the brake plate 18. The brake plate 18 is moved from a position perpendicular to the longitudinal axis 34 of the working piston to an inclined position relative to the longitudinal axis 34 of the working piston.

[0175] By tilting the brake plate 18, it is contacted with the working piston 15 and the brake plate 18 can stop the forward movement of the working piston 15 along the setting axis 30.

[0176] Figure 3 shows a sectional view of a braking element 18 according to the invention in a braking volume 20 of a working device 591 according to the invention in driving mode 100 and in braking mode 200. Figure 3a shows an enlarged view of the braking volume 20 from Figure 1 and Figure 3b shows an enlarged view of the braking volume 20 from Figure 2.

[0177] Figure 3a shows the brake plate 18 in a position perpendicular to the longitudinal axis 34 of the working piston within the brake volume 20. The brake plate 18 is in this perpendicular position when the working tool 591 is in driving mode 100, i.e., when the contact travel 43 has been overcome. The brake plate 18 comprises a brake element longitudinal axis 36 which, in driving mode, forms an angle α of 90° with respect to the working piston setting axis 34. In other words, the brake plate 18 and the working piston 15 are not in contact in driving mode, even when the working piston 15 is guided through the brake opening 26 of the brake plate 18. In this embodiment, the working piston 15 has recesses 40 which encompass different distances of the outer contour of the working piston 15 from the longitudinal axis 34 of the working piston. In other words, the working piston 15 has a grooved structure and is not—visually speaking—smooth. The brake plate 18 includes a brake opening recess 32 on two sides.The brake opening recess 32 includes a local thinning of the thickness of the brake plate 18 at the brake opening 26. In other words, the brake plate 18 is thinner at the brake opening 26 than in other areas of the brake plate 18.

[0178] Figure 3a also shows an eccentricity E between the brake opening center axis 38 and the working piston longitudinal axis 34 or the setting axis 30. That is, the smallest distance of the brake plate 18 to the working piston 15 is greater at the upper part of the brake plate opening than at the lower part of the brake plate opening in drive mode 100.

[0179] Figure 3a shows a truncated edge 60 on the brake plate 18. This truncated edge 60 is required to allow the brake plate 18 to rotate around the stop axis 22 within the brake volume 20. Without this truncated edge 60, the brake plate 18 would not be fully rotatable. The stop axis 22 extends into the depth of the blade and is a longitudinal region against which the brake plate 18 abuts by means of a stop edge 23, which also extends into the depth of the blade. By abutting the stop edge 23 of the brake plate 18 against the stop axis 22 of the brake volume 20, the brake plate 18 can be moved along the setting axis 30.

[0180] Figure 3b shows how the brake plate 18 was rotated about the stop axis 22 between the driving mode 100 and the braking mode 200. Figure 3b illustrates the purpose of the eccentricity E. Because the working piston 15 includes recesses 40, the upper braking area 28-1 of the brake plate 18 must pivot further to engage a recess 40 compared to a raised section 44. Thus, in braking mode 200, the upper braking area 28-1 engages directly in a recess 40, and the lower braking area 28-2 engages a raised section 44 of the working piston 15. Therefore, in braking mode, the brake plate 18 cannot move upwards or downwards, and the static friction with the working piston 15 is increased.

[0181] Figure 3b also shows the definition of the clamping distance h based on the two

[0182] Braking areas 28-1 and 28-2. The clamping distance h is defined as the distance between the two braking areas 28-1 and 28-2 along the setting axis 30 of the working tool 591. In Figure 3a, the working tool 591 is in driving mode 100, so the brake plate 18 is perpendicular to the working piston 15. In other words, in driving mode 100, the setting axis 30 of the working tool 591 and the brake opening center axis 38 are parallel to each other, and thus the two braking areas 28-1 and 28-2 have no clamping distance h to each other along the setting axis 30 of the working piston 15 in driving mode 100.

[0183] If the working device 591 is in braking mode 200 as shown in Figure 3b, the brake plate 18 is not perpendicular to the working piston 15, but has an angle α of 70°. In other words: In braking mode 200, the setting axis 30 of the working device 591 and the brake opening center axis 38 are not parallel to each other, and thus the two braking areas 28-1 and 28-2 have a clamping distance h to each other along the setting axis 30 of the working piston 15 in braking mode 200.

[0184] Figure 3b also shows the brake element lever a which is defined by the distance of the setting axis to the stop axis 22.

[0185] Figure 4 shows a first embodiment of a brake element according to the invention. In this embodiment, the brake element is a brake plate 18. The brake plate 18 comprises a width B, a height H, and a thickness D. In this embodiment, the brake plate has a width of 20 mm, a height of 28 mm, and a thickness of 5 mm. At the upper end of the brake plate 18, two contact areas 71 for the pressure device are provided. At these contact areas 71, the brake plate 18 is in contact on one side with the pressure sensor 41 or a bridge element of the pressure sensor 41 (not shown here). On the opposite side of the contact areas 71, the brake plate 18 is in contact with the pressure spring 16 of the working device 591. The brake plate 18 also includes a brake opening 26 for the passage of a working piston.

[0186] Figure 4 also shows a section AA along the longitudinal axis 36 of the brake element. In the section AA, the thickness D and the height H of the brake plate 18 are shown. Furthermore, it can be seen that the brake opening 26 has two brake opening recesses 32. In addition, the brake plate 18 includes a truncated edge 60.

[0187] Figure 5 shows a second embodiment of a brake element according to the invention. In this embodiment, the brake element is a brake plate 18B. The brake plate 18B comprises a width B, a height H, and a thickness D. In this embodiment, the brake plate has a width of 20 mm, a height of 33 mm, and a thickness of 5 mm. At the upper end of the brake plate 18B, a contact area 71 B for the pressure device is provided. At this contact area 71 B, the brake plate 18B is in contact on one side with the pressure sensor 41 of the working device 591. On the opposite side of the contact area 71 B, the brake plate 18B is in contact with the pressure spring 16 or a sleeve 17 of the pressure spring 16 of the working device 591. The brake plate 18B further comprises a brake opening 26B for the passage of a working piston (not shown).

[0188] Figure 5 also shows a section AA along the longitudinal axis of the brake element. In the section AA, the thickness D and the height H of the brake plate 18B are shown. Furthermore, it can be seen that the brake opening 26B has two brake opening recesses 32B. In addition, the brake plate 18B includes a truncated edge 60B.

[0189] Figure 6 shows an embodiment of a working piston according to the invention. The working piston 15 comprises recesses 40 on its surface. The recesses 40 are shown schematically in magnified view 50. The working piston 15 has different distances of the outer contour 86 from the longitudinal axis 34 of the working piston. For example, the raised areas 44 are further from the axial axis of the working piston than the recesses 40. In this embodiment, the outer contour 86 of the working piston 15 has a diameter of 8.4 mm. Thus, the outer contour 86, and therefore also the raised areas 44, are 4.2 mm from the longitudinal axis 34 of the working piston. The recesses 40 are 4 mm from the longitudinal axis 34 of the working piston. Thus, the recesses 40 have a value of 0.2 mm. In other words, in this embodiment the recesses are 400.2 mm deeper - or closer to the longitudinal axis 34 of the working piston - than the raised areas 44.

Claims

Patent claims 1. Working tool for driving a fastening element into a substrate, comprising a working piston guide having a cavity, a working piston, wherein the working piston is movably arranged in the working tool in the cavity of the working piston guide along a setting axis, a pressure device for transitioning the working tool from a driving mode to a braking mode, a pressure sensor, wherein the pressure sensor is in direct contact with the substrate in the driving mode, a pressure spring, wherein the pressure spring is connected to the pressure sensor such that the pressure spring is tensioned in the driving mode and at least partially relaxed in the braking mode so that the pressure sensor is movable in a setting direction of the working tool, a braking element for reducing recoil energy in the working tool, wherein the braking element is contacted with the pressure device.

2. Working device according to the preceding claim, wherein the braking element is arranged in a braking volume.

3. Working device according to the preceding claim, wherein the brake volume connects to the cavity of the working piston guide.

4. Working device according to one of the two preceding claims, wherein the brake element is rotatable about a stop axis in the brake volume.

5. Working device according to one of the preceding claims, wherein the braking element is a brake plate, wherein the brake plate has a stop edge.

6. Working device according to one of the preceding claims, wherein the brake element has a brake opening for the passage of the working piston.

7. Working device according to the preceding claim, wherein the brake opening has two brake areas.

8. Working device according to the preceding claim, wherein the two braking areas in braking mode have a clamping distance h to each other along the setting axis of the working piston.

9. Working device according to one of the two preceding claims, wherein the brake opening has a brake opening recess.

10. Working device according to the two preceding claims, wherein the clamping distance h in braking mode has a value between 0.1 mm and 5 mm.

11. Working device according to one of the preceding claims, wherein the brake element comprises a brake element longitudinal axis and the working piston comprises a working piston longitudinal axis, wherein in the driving mode the brake element longitudinal axis has an angle between 81° and 99° to the working piston longitudinal axis and / or in the braking mode the brake element longitudinal axis has an angle between 45° and 80° to the working piston longitudinal axis.

12. Working device according to one of the preceding claims, wherein the working piston has recesses to increase the braking effect of the working device.

13. Working device according to the preceding claim, wherein the recesses have at least one of the following values: a. 0.05 mm b. 0.06 mm c. 0.07 mm d. 0.08mm e. 0.09 mm f. 0.1 mm g. 0.125mm h. 0.1 mm i. 0.175mm j. 0.2mm k. 0.225mm l. 0.25mm 14. Working device according to one of the preceding claims, wherein the working piston has a coating to increase the braking effect of the working device.

15. Method for transferring a working tool from a driving mode to a braking mode comprising the steps a. pressing a working tool against a surface, b. lifting the working tool from the surface, characterized in that c. by lifting the working tool from the surface, a pressing device moves a braking element in such a way that the working tool is transferred from a driving mode to a braking mode.

16. Working tool for driving a fastening element into a substrate, comprising a working piston guide having a cavity, a working piston, wherein the working piston is located in the cavity of the The working piston guide is movably arranged along a setting axis in the working tool, comprising a pressing device for transferring the working tool from a driving mode to a braking mode, a pressure sensor, wherein the pressure sensor is in direct contact with the surface in driving mode, a pressure spring, wherein the pressure spring is connected to the pressure sensor such that the pressure spring is tensioned in driving mode and at least partially relaxed in braking mode, so that the pressure sensor is movable in a setting direction of the working tool, a braking element for reducing recoil energy in the working tool, wherein the braking element is contacted with the pressure device, wherein the braking element has a brake opening for the passage of the working piston, wherein the brake opening has two braking areas, and wherein the brake opening has a brake opening recess.

17. Working device according to the preceding claim, wherein the braking element is arranged in a braking volume.

18. Working device according to the preceding claim, wherein the brake volume connects to the cavity of the working piston guide.

19. Working device according to one of claims 16 to 18, wherein the brake element is rotatable about a stop axis in the brake volume.

20. Working device according to one of claims 16 to 19, wherein the braking element is a brake plate, wherein the brake plate has a stop edge.

21. Working device according to one of claims 16 to 20, wherein the two braking areas in braking mode have a clamping distance h to each other along the setting axis of the working piston.

22. Working device according to the preceding claim, wherein the clamping distance h in braking mode has a value between 0.1 mm and 5 mm.

23. Working device according to one of claims 16 to 22, wherein the brake element comprises a brake element longitudinal axis and the working piston comprises a working piston longitudinal axis, wherein in the driving mode the brake element longitudinal axis has an angle between 81° and 99° to the working piston longitudinal axis and / or in the braking mode the brake element longitudinal axis has an angle between 45° and 80° to the working piston longitudinal axis.

24. Working device according to one of claims 16 to 23, wherein the working piston has recesses to increase the braking effect of the working device.

25. Working tool according to the preceding claim, wherein the recesses have at least one of the following values: a. 0.05 mm b. 0.06 mm c. 0.07 mm d. 0.08 mm e. 0.09 mm f. 0.1 mm g. 0.125 mm h. 0.1 mm i. 0.175 mm j. 0.2 mm k. 0.225 mm l. 0.25 mm 26. Working device according to one of claims 16 to 25, wherein the working piston has a coating to increase the braking effect of the working device.

27. Working device for driving a fastening element into a substrate, comprising a working piston guide having a cavity, a working piston, wherein the working piston is movably arranged in the working device in the cavity of the working piston guide along a setting axis, comprising a pressure device for transferring the working tool from a driving mode to a braking mode, a pressure sensor wherein the pressure sensor is in direct contact with the ground in the driving mode, a pressure spring wherein the pressure spring is connected to the pressure sensor such that the pressure spring is tensioned in the driving mode and at least partially relaxed in the braking mode so that the pressure sensor is movable in a setting direction of the working tool, a braking element for reducing recoil energy in the working tool wherein the braking element is contacted with the pressure device, and wherein the working piston has recesses to increase the braking effect of the working tool.

28. Working device according to the preceding claim, wherein the braking element is arranged in a braking volume.

29. Working device according to the preceding claim, wherein the brake volume connects to the cavity of the working piston guide.

30. Working device according to one of the two preceding claims, wherein the brake element is rotatable about a stop axis in the brake volume.

31. Working device according to one of claims 27 to 30, wherein the braking element is a brake plate, wherein the brake plate has a stop edge.

32. Working device according to one of claims 27 to 31, wherein the brake element has a brake opening for the passage of the working piston.

33. Working device according to the preceding claim, wherein the brake opening has two brake areas.

34. Working device according to the preceding claim, wherein the two braking areas in braking mode have a clamping distance h to each other along the setting axis of the working piston.

35. Working device according to one of the two preceding claims, wherein the brake opening has a brake opening recess.

36. Working device according to the two preceding claims, wherein the clamping distance h in braking mode has a value between 0.1 mm and 5 mm.

37. Working device according to one of claims 27 to 36, wherein the brake element comprises a brake element longitudinal axis and the working piston comprises a working piston longitudinal axis, wherein in the driving mode the brake element longitudinal axis has an angle between 81° and 99° to the working piston longitudinal axis and / or in the braking mode the brake element longitudinal axis has an angle between 45° and 80° to the working piston longitudinal axis.

38. Working tool according to any one of claims 27 to 37, wherein the recesses have at least one of the following values: a. 0.05 mm b. 0.06 mm c. 0.07 mm d. 0.08 mm e. 0.09 mm f. 0.1 mm g. 0.125 mm h. 0.1 mm i. 0.175 mm j. 0.2 mm k. 0.225 mm l. 0.25 mm 39. Working device according to one of claims 27 to 38, wherein the working piston has a coating to increase the braking effect of the working device.

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