Hand-held tool

Abstract

The invention relates to a hand-held tool (1) having an actuator (11) and a moving part (16), the actuator (11) driving the moving part (16) directly or via a gearbox or by means of a hydraulic medium in order to carry out a predetermined operation, a chamber (18) being formed in the hand-held tool (1), in which chamber an air volume having an air pressure is or can be enclosed. In order to further improve a hand-held tool of this type, it is suggested that the air pressure can be varied and evaluated in order to ascertain the state of the hand-held tool (1), said hand-held tool being operable independently of the air pressure created in the chamber (18).

Description

Technical Field

[0001] The present invention relates to a handheld tool having an actuator and a moving part, wherein the actuator drives the moving part directly or via a gear box or by a hydraulic medium to perform a predetermined operation, and a chamber is constructed in the handheld tool, in which an air volume with air pressure is enclosed or can be enclosed. Background Art

[0002] Hand-held tools of the type described are known in a variety of designs. These designs are used, for example, for extrusion, cutting, punching, crimping or, for example, simply as gripping tools, wherein the work is usually carried out by bringing a moving part to bear indirectly or directly against a fixed part on the tool side, between which the workpiece to be processed is placed. For this purpose, the moving part is moved indirectly or directly from a movement start position in the direction of a movement end position by means of an actuator, wherein the actuator can be an electric motor that acts via the intervention of a gearbox and / or via a hydraulic medium. The actuator can also be, for example, a movable handle that can act on the moving part directly or, for example, indirectly via a hydraulic medium.

[0003] Regarding hand-held tools designed as hydraulically acting squeezing tools, for example, reference is made to WO 03 / 084719A2 (US 7 254 982 B2), EP 1 084 798 B1 (US 6 718 870 B2) or WO 2020 / 053101A1 (US 2021 / 0339367 A1), and reference can also be made to WO 2021 / 069587A1 or DE 10 2013 101 978 A1. For example, a hand-held tool is known from DE 10 2014 100 348A1, which is designed as a squeezing tool with an electric motor that acts on a moving part via a gearbox. A pliers-type hand-held tool is also known from WO 2019 / 219407 A1 (US 2021 / 0296837A1).

[0004] The contents of the aforementioned patent documents and patent applications are hereby fully incorporated into the disclosure of the present solution, including for the purpose of incorporating the features disclosed in the patent documents into the claims of the present application.

[0005] It is known from the prior art for pressing devices that a return spring can be arranged in a chamber located in the handheld tool, which return spring loads the moving part, for example in the direction of a displacement starting position. Summary of the invention

[0006] The technical problem to be solved by the present invention is to advantageously design a handheld tool of the above-mentioned type.

[0007] The technical problem is solved in that the moving part or an opening part independent of the moving part is arranged to change the air pressure by changing the space of the chamber or alternatively by supplying additional air into the chamber, wherein the air pressure can be evaluated to identify the state of the hand-held tool, wherein the moving part can be driven with or without pressure.

[0008] The solution also consists in that the air pressure can be varied and evaluated to detect the state of the handheld tool, wherein the operation can be performed independently of the air pressure generated in the chamber.

[0009] During the movement of the moving part from the movement start position to the movement end position, and alternatively or additionally also during the return of the moving part from the movement end position to the movement start position, the air pressure in the chamber may change. The change in air pressure may occur independently of the displacement of the moving part, which may be due to a specially activated control unit that causes a pressure increase, or due to a pressure source connected from the outside. By evaluating the actual air pressure, preferably based on at least one stored target air pressure, knowledge about the state of the hand-held tool, such as the function, can be obtained. In addition, such a comparison with stored target values ​​can also be carried out when the hand-held tool is moved into different moving part positions.

[0010] In one possible design, the moving part can be part of the chamber or at least partially define the boundaries of the chamber. The change in air pressure can here directly depend on the displacement of the moving part. Accordingly, the air pressure to be monitored can usually be obtained in the area of ​​the displacement path of the moving part.

[0011] The known and evaluable change in the air pressure can usually also be directly caused by a pump, which delivers a hydraulic medium to move the moving part. The pump can be driven by a gearbox, which converts the rotary motion of the electric motor into a reciprocating motion. The gearbox can be a friction gearbox. The movement of the gearbox can be generated by the air pressure. The gearbox can here simultaneously act as an air piston pump (the hand-held tool operates as expected) to pump air into a sealed or sealable chamber. The air pressure in the chamber that may be locally provided relative to the pump and / or the drive and / or the moving part is obtained.

[0012] The evaluation of the change in air pressure in the chamber can provide an adjusted display for the user. This can be a pointer in the simplest form, which can be seen by the user during the change in air pressure. For example, an analog or digital display can also be provided, which may only show two possible states, or also show any change in air pressure, for example giving a digital pressure value display. Other optical and / or acoustic signals may also be triggered depending on the change in air pressure.

[0013] Furthermore, the data concerning the detected changes in the air pressure can also be stored in a possibly provided data memory of the handheld tool or in an external data memory to which the data can be transmitted by radio.

[0014] During operation of the hand-held tool, the air pressure that should be reached in the chamber and that can be known during the process preferably has no influence on the forces that are formed on the workpiece. The execution of the operation is also not dependent on the air pressure that may be generated in the chamber when the operation is performed. The air pressure may form a reaction force, which is however clearly secondary to the driving force generated by the actuator for performing the operation. The pressure values ​​that can be reached in the chamber are preferably so low that they are not sufficient to initiate the extrusion or cutting of the workpiece by themselves, or are not sufficient to significantly support the process.

[0015] The additional features are usually described below, including in the description of the figures, in the preferred assignment to the basic described solution or the additional features. However, the additional features may be important because they are only assigned to individual, already described features of the basic solution, or to the corresponding further described features, or may be important independently of one another.

[0016] In one possible embodiment, a pressure sensor is used to measure the air pressure in the chamber. The air pressure measured by this pressure sensor can be evaluated to derive the state of the handheld tool. Conclusions can be drawn from this measurement evaluation, for example, about correct operation.

[0017] The pressure sensor may be arranged directly on the chamber, facing the chamber interior. The pressure sensor may be directly acted upon by the air pressure in the chamber. However, the pressure sensor may also be acted upon indirectly, for example only via a loose component moved by the air pressure or the like. The pressure sensor may also be partially separated from the chamber, but connected to the chamber interior via an air duct.

[0018] The air pressure can be varied by changing the size of the chamber. This change in the size of the chamber can be directly related to the displacement of the moving part, especially in those designs where a part of the moving part is designed as a piston, which can be present in those designs that move when displaced in the chamber. In particular, when the moving part moves from a movement start position in the direction of a movement end position, wherein the moving part is designed as a piston and the moving part is contained in the chamber, the piston section moving in the chamber leads to a continuous reduction in the size of the chamber. The piston can form a movable part of the chamber wall.

[0019] A change in the air pressure within the chamber can also be produced by changing the amount of air contained in the chamber. For example, by connecting a pump or compressor to the chamber, the air pressure in the chamber can be changed without requiring the movement of moving parts.

[0020] Furthermore, the air pressure can change as an operation is initiated or performed, and accordingly, when using the handheld tool, safety-related monitoring can also be performed during operation by detecting and evaluating the air pressure that develops in the chamber. Safety-related components, such as screws, can be contained in the closed structure of the chamber. The absence of a safety-related component, for example, does not lead to the expected increase in air pressure, or does not reach a predetermined level.

[0021] According to a preferred embodiment, the chamber can have a pneumatic sensor in the form of a sealable opening. It is further preferred that this opening is separated from other openings, for example through which a part of the moving part moves outwards when viewed from the chamber, or is also separated from the following opening through which the moving part acts inside the chamber.

[0022] The sealable opening of the chamber can be regarded as an important component for obtaining the state of the handheld tool. The seal can be formed by an independent device that is not directly operated and is required for the operation, or it can also be formed by one or more components or sections of the handheld tool itself. One or more components of the handheld tool itself can also be used directly to perform the operation, or they are necessary for safety reasons. The expected air pressure that is not formed can also be regarded as a part that is directly required for the operation, or a part that is not present or damaged and is necessary for safety reasons. The user can also close the opening when operating the handheld tool.

[0023] Another embodiment can connect the opening to the chamber via an air duct. This allows a partial separation between the chamber and the opening. If the air duct is included in the chamber, this results in the chamber having a relatively large length. The air duct can be provided by a channel integrated into the hand tool or by a hose preferably arranged in the hand tool.

[0024] In addition, a plurality of such openings can be provided on the handheld tool, which are all connected to the chamber via air ducts. This makes it possible to monitor various safety-related areas of the handheld tool by knowing the air pressure value in (preferably only one) chamber.

[0025] The moving part may be a transverse displacement part which can be transversely displaced from a transverse starting position to a transverse end position and vice versa. Such a transverse displacement part is, for example, a transversely displaceable squeezing jaw in a hand-held tool for compressing material, wherein the transversely displaceable squeezing jaw can be moved in a direction towards a fixed squeezing jaw. The transverse displacement part may also be, for example, a transversely displaceable cutting jaw which can be moved in a direction towards a fixed cutting jaw. In this case, individual parts of the hand-held tool may be considered as moving parts. For example, in a hydraulically driven hand-held tool, a piston may also be a moving part in the sense of the present disclosure.

[0026] In the above and below, the moving part also refers to the traverse part, and the movement of the traverse part also refers to the traverse part or the traverse of the moving part.

[0027] Preferably, a defined displacement path of the traverse component or moving component is provided in the handheld tool. In particular, the traverse end position, but in addition, for example, one or more traverse intermediate positions and / or traverse start positions can also be determined and / or monitored by acquiring the air pressure. This acquisition, for example, further enables the expected completion of the operation to be detected when the traverse end position is reached. In addition, interruptions, for example, during the traverse or traverse of the moving component can also be acquired, for example by comparing the expected air pressure value for a specific traverse position (for example the traverse end position) with the determined actual air pressure value.

[0028] The traversing of the traversing element can be accompanied by a reduction in the size of the chamber, with the air pressure in the chamber increasing as the traversing element is increasingly traversed outward from the traversing start position as the chamber is closed off from the surrounding environment.

[0029] The increase in the air pressure in the chamber is also related to the increase in the temperature of the air volume in the chamber. Accordingly, the increase in temperature can also be used to evaluate the state of the handheld tool. A temperature sensor can be used to measure the increase in temperature.

[0030] The increase in pressure in the chamber can be regarded as a measure of the traverse path. By repeated pressure measurements, the measure of the air pressure in the chamber can be monitored over the entire movement path. Here, for example, a continuously rising air pressure can be determined, or further, for example, a sudden significant increase in pressure can be determined. By comparison with stored target values, monitoring of the entire movement path can be achieved in continuous measurement. For example, when a sudden and significant pressure increase is monitored, a check can be carried out to see whether a specific traverse position has been reached.

[0031] The increase in pressure and the rise in temperature can also be regarded as a measure of the traverse path. The measured values ​​can be used in combination, for example, in the mathematical sense of a connection with "and", where both measured values ​​must point to a (significant) increase in order to determine a specific traverse position. Alternatively, only one (significant) rising measured value is obtained in two measurements, which in the mathematical sense of a connection with "or" of the two measurements can indicate that a specific traverse position has been reached.

[0032] The provided opening can be closed by moving the traversing member to a specific traversing position, preferably a traversing end position. In this way, the traversing or moving member can be arranged in a sealed manner in front of the opening, with a portion of the traversing member being in the predetermined position. In a possible embodiment, the opening can be exposed in the presence of a given traversing path from the traversing start position to the predetermined traversing position, so that the ambient pressure is usually generated in the chamber over the traversing path.

[0033] The movement of the traverse member thus makes it possible to increase the air pressure in the chamber when the lateral end position is reached, and to close the opening accordingly. The jump in air pressure can be detected by the pressure sensor.

[0034] This (sudden) increase in the air pressure in the chamber is preferably interpreted as indicating that the traverse end position of the traverse element has been reached.

[0035] In another embodiment, the handheld tool may have a working head, for example, may include a working head for compressing a material.

[0036] Thus, the working head can have a tool with an extrusion profile, wherein the tool can also be held interchangeably in the working head. The extrusion profile formed in the tool can have an opening, which can be connected to the chamber via an air channel.

[0037] The opening is usually exposed, so that the interior of the chamber is connected to the environment via the air duct. In a preferred embodiment, the opening can be formed in a region of the tool that is not accessible to the material placed in the extrusion opening that occurs between the tools, in particular in a state in which the material is not yet affected by compression. The movement of the tool and the resulting extrusion action on the material, for example, leads to a deformation of the material, so that the outer surface of the material is deformed in a manner that matches the tool base body. During this deformation process, preferably at the end of the deformation process, the material material is deformed in such a way that it reaches the region of the opening and the opening is finally covered so that it is at least approximately sealed.

[0038] Therefore, the pressure increase in the chamber that is achieved with the closing of the opening can be regarded as a complete compression of the material. A possible pulse or sudden rise in the air pressure in the chamber indicates the closing of the opening, wherein the closure can preferably only be achieved by a complete deformation of the material and the resulting adaptation to the base body.

[0039] In another embodiment, the hand-held tool can have a connected or connectable battery for operating the electric drive. The proposed acquisition of the air pressure in the chamber can be used in this case in the form of an increase in the pressure in the chamber to indicate the presence of a correctly connected, undamaged battery, in particular on the housing side. The chamber can thus be formed completely or even only partially by the housing interior of the battery housing. An air pressure acquired during operation of the hand-held tool that is less than a predetermined target air pressure can indicate a crack in the battery housing. In the event of such a housing crack, the chamber is not sealed off from the environment, so that a sufficiently high air pressure cannot be built up. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The solution is explained below with reference to the drawings, which however only describe exemplary embodiments. Therefore, components which are described only with respect to one of the exemplary embodiments and which are not replaced by different components in another exemplary embodiment due to outstanding features therein are also described as being present in this other exemplary embodiment in any case. In the drawings:

[0041] Figure 1 A partially cut-away side view of the electric hand-held tool in the first embodiment is shown, which relates to the traverse start position of the moving part or traverse part;

[0042] Figure 2 Show Figure 1 A schematic cross-sectional view of the cutting plane III;

[0043] Figure 3 Show Figure 1 A magnified view of region III;

[0044] Figure 4 Shown corresponding to Figure 3 A view of the end position of the traverse movement of the traverse movement component;

[0045] Figure 4a Show Figure 4 , and showing an implementation of the operating components independent of the moving components;

[0046] Figure 5 A separate perspective view of the traverse member is shown;

[0047] Figure 6 A graph showing air pressure measurement;

[0048] Figure 7 Show according to Figure 3 sectional view, relating to a second embodiment;

[0049] Figure 8 Show Figure 7 An enlarged view of region VIII;

[0050] Fig. 9 Shown corresponding to Figure 7 A view of the end position of the traverse movement of the traverse movement component;

[0051] Fig.10 Show Fig. 9 A magnified view of region X;

[0052] Fig.11 Show according to Figure 7 sectional view, relating to a third embodiment;

[0053] Fig.12 Show Fig.11 A magnified view of region XII;

[0054] Fig.13 Shown corresponding to Fig.11 , involving the end position of the traverse;

[0055] Fig.14 Show Fig.13 A magnified view of region XIV;

[0056] Fig.15 A side view of a handheld tool in another embodiment is shown;

[0057] Fig.16 A schematic diagram showing a handheld tool in another embodiment;

[0058] Fig.17 A view showing a handheld tool in another embodiment;

[0059] Fig.18 A schematic longitudinal cross-sectional view of a handheld tool in another embodiment is shown;

[0060] Fig.19 A schematic diagram showing a handheld tool in another embodiment, relating to a starting position of a moving part;

[0061] Fig. 20 Shown corresponding to Fig.19 , relating to the end positions of the moving parts;

[0062] Fig.21 A partial cross-sectional view of a handheld tool according to another embodiment is shown;

[0063] Fig. 22 Show according to Fig.21 another similarly partially cutaway view of a hand-held tool of;

[0064] Fig.23 Show Fig.21 Magnified view of region XXIII;

[0065] Fig.24 Show Fig. 22 Magnified view of region XXIV. DETAILED DESCRIPTION

[0066] The following description of the drawings shows different embodiments of the handheld tool 1, wherein: Figures 1 to 6 Concerning the first embodiment, Figures 7 to 10 relates to the second embodiment, and Figures 11 to 14 Relating to the third embodiment; Figures 15 to 20 Additional exemplary embodiments are shown, and Figures 21 to 24 Another embodiment is shown. Other alternative embodiments are also possible, so Figures 1 to 24 This should not be interpreted as limiting, but rather as explaining possible features.

[0067] Figure 1 The handheld tool 1 in the first embodiment shown can have a pistol-shaped tool base 2 which forms the tool housing. Fig.15 The tool base 2 of the embodiment of the present invention can also be designed to be slender and rod-shaped.

[0068] Here, the handheld tool 1 is a hydraulically actuated extrusion tool or crimping tool. However, alternatively, the handheld tool 1 can also be modified in the following manner to be used for other purposes, such as for cutting (such as Figures 7 to 14 ) or a stamped workpiece.

[0069] The tool base 2 also has a handle 5, which is usually oriented transversely to the geometric longitudinal axis x of the tool base 2, and by which a user can guide the handheld tool 1. If the operation is wireless, a power source in the form of a battery 4 is arranged at the free end part 3 of the handle 5 in order to supply power to the handheld tool 1. Alternatively, the power source can include a cable, which can also be used to establish a connection to a power source realized via an electrical network.

[0070] In the case where the handheld tool 1 is configured as a rod, the handle 5 can also be configured as an axial extension of the tool base 2 (see, for example, Fig.21 and Fig. 22 ).

[0071] Within the scope of the solution described here, the handheld tool 1 can also be designed with a power supply independent of the tool 1. For example, a separate actuator 7, in particular a separate power supply device and / or a separate hydraulic pump is provided, which is connected to the working head 9 of the handheld tool 1 via a hydraulic hose 8 (see Fig.16 ).

[0072] exist Figures 1 to 15 In the embodiment shown, the working head 9 or the tool holder 6 of the handheld tool 1 is connected via an adapter 10 to an actuator 11 in the form of a hydraulic actuator 12, which is integrated in the body tool base 2 of the handheld tool 1 (see Figure 2 ).

[0073] A part of the hydraulic actuator 12 may be an electric motor 33, which may be driven by a preferably provided battery 4. When a finger-actuated switch 14, which is arranged in the handle 5, for example, is operated, hydraulic fluid (oil) is pumped from the hydraulic tank 13 into the hydraulic space 15 via a pump, for example a piston pump, so that a piston-shaped moving part 16 movably arranged in the hydraulic space 15 moves in the direction of the moving part end position or the traverse part end position.

[0074] The moving part 16 can be acted upon by a return spring 17 which surrounds the moving part 16 in the region of the piston shaft section. The return spring 17 can be located in a chamber 18 defined by a chamber wall, which can be cylindrical and supported here with an end region on the chamber bottom and with an opposite end on a piston section 19 of the moving part 16 which simultaneously extends into the chamber 18.

[0075] The piston section 19 can have a radial gasket 20 on the outer circumference, which tightly seals the hydraulic space 15 formed behind the moving part 16 relative to the chamber 18 guiding the moving part 16 or relative to the pneumatic space 62 facing away from the hydraulic space 15 .

[0076] As shown, the working head 9 or the tool holder 6 can be interchangeably fixed on a cylindrical chamber wall defining the chamber 18. The working head 9 or the tool holder 6 can be rotated about a geometric longitudinal axis x pointing in the direction of piston movement in order to conveniently adapt to the local environment.

[0077] The tool carrier 21 connected to the moving part 16 can be guided linearly. The moving part can more specifically be a traverse part 60 in the working head 9, see Figure 7 The traverse element 60 can also directly constitute the tool carrier 21 .

[0078] The tool carrier 21 movable in this way can hold a tool 22 which is moved in the direction of a second tool 23 during movement through the movement path a. The second tool 23 is preferably fixed in position, more preferably fixedly inserted in the working head 9 or the tool holder 6 .

[0079] The tools 22 , 23 can also be mounted interchangeably in the working head 9 or in the tool holder 6 .

[0080] according to Figures 1 to 6 In an exemplary embodiment, the tools 22 , 23 can be designed, for example, as pressing jaws 25 with a pressing contour 24 . Figures 7 to 14 An exemplary embodiment is shown in which the tools 22 and 23 form a knife 26 having a cutting edge 27 .

[0081] During the arrangement of the extrusion jaws 25, the extrusion jaws 25 are moved toward each other until the extrusion opening 28 formed by the extrusion contour 24 is closed to extrude the material 50 (see Figure 4 When the knives 26 are used, they are guided past each other in a completely overlapping position, so that the raised cutting opening 29 is completely closed in the lateral end position of the moving part 16 (see Fig. 9 and 13 ).

[0082] By pumping hydraulic fluid into the hydraulic space 15 , the moving part 16 and therefore the working head 9 or the tool holder 6 are advanced counter to the restoring force of the spring 17 .

[0083] The return movement of the moving part 16 preferably occurs only due to the restoring force of the spring 17 , wherein the hydraulic fluid flows out of the hydraulic space 15 and flows back to the hydraulic reservoir 13 through the moving part 16 while opening a return valve (not shown).

[0084] according to Fig.16 In the embodiment of the present invention, the hydraulic reservoir 13 can be arranged in the external actuator 7. In this case, the hydraulic reservoir 13 is connected to the hydraulic space 15 through the hydraulic hose 8.

[0085] In accordance with Fig.17 In the embodiment of the invention, no electric motor drive device for conveying hydraulic fluid is provided. Instead, the actuator 11 is provided as a rod-shaped handle 30, which can rotate relative to a fixed handle 31 and the hydraulic actuator 12 fixed thereto.

[0086] Also available Fig.18 The spindle drive 32 in the embodiment shown replaces the hydraulic actuator. The drive also resists the force of the return spring 17 present in the chamber 18.

[0087] The spindle of the spindle drive device 32 is driven by the motor 33 by operating the switch.

[0088] In addition, according to Fig.19 and Fig. 20 The hand-held tool 1 may also be a pliers-like tool that must be manually operated, such as a tool for compressing materials, as shown in the figure.

[0089] The handle 30 can be rotated like a pair of pliers towards the other handle 31 and can also be used as an actuator 11. The articulation 34 serves here to move the two pressing jaws 25 towards each other while closing the pressing opening 28.

[0090] In particular, in hydraulic hand tools, the pneumatic space 62 (see Figure 3 ) is provided by the air-side chamber 18 of the piston-like moving part 16. When the hand-held tool 1 is operated and the moving part 16 or the traverse part 60 is moved forwards, the volume of the normally closed chamber 18 for forming the spring space is reduced, especially in the region of the pneumatic space 62, and the air inside is compressed. Different types of pneumatic sensors S can be operated during use by this compressed air and include at least one pressure sensor 35, see Figure 1 The pressure sensor 35 can be used to sense the air pressure inside the chamber 18. The pressure sensor 50 can be arranged directly on the chamber 18, facing the interior of the chamber 186. A possible downstream electronic evaluation unit and / or control unit can trigger or block functions in the handheld tool 1 depending on the measurement result.

[0091] This chamber 18 can also be provided in a manner according to Fig.18 The spindle drive 32 of the handheld tool 1 is used for pressure measurement.

[0092] according to Fig.19 and Fig. 20 In the case of a pliers-like hand-held tool 1 intended for manual operation, the chamber 18 , which is usually closed if necessary, only appears when the tool is actuated.

[0093] The change of the air pressure in the chamber can also be produced by changing the amount of air in the chamber, ie the volume of air in the chamber. For example, the air pressure in the chamber can be changed by connecting a pump or a compressor to the chamber without requiring any movement of moving parts.

[0094] refer to Figure 3 , firstly the possibility of generating an additional or alternative higher air pressure by means of a pump or compressor is shown, see reference numeral 86. The pump or compressor can be driven by a separate electric motor 87. The separate electric motor 87 can also have a separate battery 90. The air generated in the pump or compressor 86 can flow into the chamber 18 via a pump return valve 88 and a separate air duct 89.

[0095] refer to Figure 4a , also shows the possibility of having a separate operating part 91. The operating part 91 can be a piston, in particular an air piston. The piston can be biased into its starting position by a return spring 92. With this configuration, no additional air is delivered into the chamber 18, but the chamber 18 changes its volume only by moving the air piston. The air piston is part of the chamber wall.

[0096] In addition, for Figure 4a In the embodiment of the present invention, there may also be an air pump or air compressor 86, a corresponding electric motor 87 and an independent air duct 89. Therefore, the movement of the air piston may also be achieved by air pressure.

[0097] With regard to the aforementioned evaluation unit and / or control unit, these can also be arranged on the printed circuit board 38 .

[0098] The evaluation unit and / or the control unit can be arranged, for example, on a printed circuit board 38 , as can a possibly provided memory for storing the determined air pressure data.

[0099] The different sensors S can be formed by sealable openings 36. These openings 36 are each connected to a pressure sensor 35 via an air channel 37, wherein the pressure sensor 35 can advantageously be arranged on a circuit board 38, for example, on a circuit board that also has a device controller. The circuit board 38 is preferably arranged in the handle 5.

[0100] In handheld tools 1 according to Fig.16 In the configuration, the pressure sensor 35 arranged on the circuit board 38 can be set in the separate actuator 7, for which purpose, in addition to the hydraulic hose 8, a channel-shaped sensor pipeline 64 can be formed between the pressure sensor 35 and the chamber 18 constructed in the handheld tool 1.

[0101] The air channel 37 can be formed by a gas-tightly connected hose 39, which extends in particular to the interior of the tool housing. Additional air channels 37 can be formed by open channels 40 in the working head 9 or tool holder 6 and / or tools 22, 23 and / or moving parts 16 and / or adapter 10, wherein gaskets 41 can be distributed so that these channels 40 can bridge the interface between two sections that can move, in particular rotate, relative to each other, such as the interface between the working head 9 or tool holder 6 and the adapter 10. In addition, these channels 40 can transition into the hose 39 inside the tool housing.

[0102] A plurality of channels 40 and / or hoses 39 for monitoring a plurality of sensors S can be connected to one another, so that preferably only one air channel 37 ultimately leads directly to the pressure sensor 35 .

[0103] First, according to Figures 1 to 6 An exemplary embodiment is described in which the moving part 16 in the region of the piston shaft-shaped section has an air duct 37 extending in the direction of the longitudinal axis x, the air duct 37 preferably being in the form of a central air duct channel 40 which faces away from the piston section 19 and opens into a front surface 42 of the moving part 16 or the tool carrier 21 .

[0104] Branch passages 43 oriented transversely to the preferred central airway passage 40 connect to the interior or pneumatic space 62 of the chamber 18 .

[0105] like Figure 4 As shown, the cylindrical wall forming the chamber 18 is closed by a sleeve 44, which is radially spaced apart from the cylindrical wall forming the chamber 18, and a tubular channel section 45 is left between the sleeve and the cylindrical wall. The channel section 45 is sealed relative to the environment and is connected to the chamber 18, in particular the pneumatic space 62, via a transverse channel 46 formed in the chamber wall.

[0106] The channel section 45 can merge into a pipe section 47 which in turn can be connected to one of the hoses 39 leading to the pressure sensor 35 .

[0107] In the operating state of the handheld tool 1, the central air channel channel 40 extending through the moving part 16 transitions into a partial air channel which extends in the form of a channel section 48 in the held pressing jaw 25 to the pressing contour 24. The channel section 48 opens into one of the sealable openings 36 in order to form a pneumatic sensor S in the pressing contour 24, wherein once the compression has been fully performed, the region with the opening 36 is in contact only with the outer skin of the material 50 to be deformed.

[0108] When the switch 14 is operated (or if the hand-held tool 1 is Fig.17 The design shown is provided with a rotary handle 30), and the drive device given and described causes the moving part 16 to move from Figure 3 The lateral movement start position shown as an example moves in the direction of the lateral movement end position, so that the material 50 is gradually deformed by the relative movement of the extrusion profile 24, and ends at Figure 4 The complete deformation is shown, in which the outer skin of the material 50 seals the opening 36 provided in the pressing contour 24 of the moving pressing jaw 25 .

[0109] The interior of the chamber 18 is connected to the pressure sensor 35 through the transverse channel 46 together with the transverse channel 52, and is connected to the airway 37 leading to the opening 36 through the branch channel 43, so that the air pressure generated in the chamber 18 is also gradually formed in the entire airway network, and the opening 36 is arranged in the extrusion profile 24 of the movable extrusion jaw 25.

[0110] This results in a characteristic pressure peak at the end of the compression or crimping process, which indicates complete compression. Figure 6 Diagram D shows a material 50 (eg 150 mm) adapted to the extrusion jaw 25. 2 An exemplary pressure curve D1 of a compression process performed as expected for a cable lug) is shown.

[0111] The pressure peak DS of the pressure curve D1 can be easily detected by the pressure sensor 35 and can be regarded as a signal that the compression has been correctly performed.

[0112] In contrast, when a material with a small cross-section is compressed (e.g., 120 mm 2 Cable lug) produces a pressure curve D2. When compressed, the undersized material does not produce a deformation that causes the opening 36 provided in the pressing profile 24 of the moving pressing jaw 25 to become closed.

[0113] This results in an advantageous compression or crimping test, the result of which can be communicated to the user, for example, by an optical or acoustic signal. The result can also be stored, for example, in a tool memory.

[0114] The air pressure generated in chamber 18 can also be used to know the end position of the traverse. Figures 7 to 15 Two exemplary embodiments related thereto are shown.

[0115] exist Figures 7 to 10 In the embodiment shown, the air channel 37 is centrally formed along the longitudinal axis x in the moving part 16. The central air channel channel 40 has two transverse channels 51 and 52 which are oriented radially to the longitudinal axis x, extend from the longitudinal axis x and are spaced apart from one another in the direction of the longitudinal axis x.

[0116] The transverse channel 52 shown near the tool 22 (shown as a tool 26) in the moving part 16 here opens freely into the environment, while the other transverse channel 51 opens into the chamber 18 or the pneumatic space 62 with the opening 36, running from the traverse start position upward to the traverse end position not yet reached (see Figure 7 and Figure 8 ).

[0117] Upon arrival according to Fig. 9 and Fig.10 At the lateral end position, in which the complete overlapping position is reached in the lateral end position of the given tool arrangement structure, the transverse channel 51 leaves the chamber 18 or the pneumatic space 62 and enters the guide section 49, which surrounds the piston shaft-shaped section of the moving part 16.

[0118] This type of position detection, for example for cutting tools, has proven to be advantageous in remotely controlled handheld tools, since it is very helpful to know when a cable has been cut, or in handheld tools for compressing material to know when compression has ended.

[0119] After one of the sealable openings 36 provided by the transverse passage 51 in the moving part 16 has passed through the gasket 53, the comparison Figure 8 and Fig.10 The increase in air pressure gives the necessary signal for this purpose, and the gasket 53 seals the chamber 18 in the guide section 49 to the outside and preferably opens it to the ambient pressure. The gasket 53 can be an O-ring.

[0120] according to Figures 11 to 14 In the exemplary embodiment, the central air channel 40 in the moving part 16 can also be connected to the transverse channel 52 ( Figures 11 to 14 Not shown, but can be referenced Fig. 9 ), which always leads to the interior of the chamber 18 or the pneumatic space 62 regardless of the lateral position. Figures 11 to 14 As shown, the central airway channel 40 which is respectively assigned to the tool 22 (shown as a blade 26 ) preferably merges into a connecting channel 54 which passes through the tool 22 and opens into a sealable opening 36 in the region of a guide surface 55 of the tool 22 .

[0121] The guide surface 55 of the tool 22 interacts with a matching guide surface 56 of the work head 9 or the tool holder 6. The surfaces 55, 56 preferably surround each other. However, the opening 36 in the guide surface 55 can preferably open into a recessed area of ​​the guide surface 55, so that the opening 36 is initially free to face the environment. See Fig.11 and 12 , the opening 36 in the guide surface 55 advances from the traverse start position to a traverse position that has not yet reached the traverse end position.

[0122] according to Fig.13 and Fig.14 , when the lateral end position is reached, wherein a complete overlapping position is reached in the lateral end position of the arrangement structure of the given tool, the opening 36 in the guide surface 55 has been transversely moved into the area of ​​the working head 9 or the tool carrier 6, wherein a sealing plug 57 is provided in the mating guide surface, which seals the opening 36 in the guide surface 55.

[0123] Here, too, a pressure increase is signaled after the opening 36 on the guide surface 55 of the traverse element 60 has been covered and closed by the sealing plug 57. The characteristic increase in pressure indicates that the tool 1 has reached the lateral end position and, in the case of a knife, the overlapping position.

[0124] Fig.18 An example is shown with a spindle drive 32. The chamber 18 is connected via an air duct 37, shown as a hose 39, to a sealable opening 36, which is formed in the extrusion contour 24 of the extrusion jaw 25. According to a first exemplary embodiment, this opening 36 is closed only when the intended inserted material has reached the end position of the traverse, which results in an appreciable and significant increase in the air pressure.

[0125] In particular in the case of electrically and / or hydraulically or pneumatically driven hand tools 1, as soon as a significant pressure rise is detected, i.e. as soon as the signaled end position of the traverse is reached, the advance can be stopped immediately and / or the return of the moving part 16 can be directly initiated.

[0126] The air pressure that can be achieved in the chamber 18 and the air channel system connected thereto is relatively low, and in any case is not low enough to generate the necessary forces in the area of ​​the tool. The air pressure that can be achieved also does not contribute to the generation of forces.

[0127] The pressure increase in the chamber 18 can also be considered as a measure of the traversing path a of the traversing member 60 .

[0128] Furthermore, a temperature sensor 61 can be provided additionally, which can detect the temperature increase in the chamber 18 as the compression of the air increases. If necessary, in addition to the detected pressure value, the detected temperature value can also be measured as a measure of the traverse path a between the traverse start position and the traverse end position.

[0129] exist Fig.19 and Fig. 20 In the illustrated pliers-like hand tool 1, the moving part 16 can be fixedly connected to the handle 30 serving as the actuator 11. During operation, when the handles 30 and 31 are moved toward each other like pliers, the moving part 16 projects into the cavity 18 formed in the region of the other handle 31.

[0130] When the handles 30 and 31 are moved toward each other, the extrusion port 28 is closed simultaneously and the moving part 16 extends into the chamber 18. This causes the volume in the chamber 18 to continue to decrease, thereby increasing the pressure in the chamber 18. This pressure increase moves the visual indicator 58 through the air passage 37 extending from the chamber 18, which protrudes out of the surrounding surface of the handle 31 through the sealed opening 59 in the corresponding air pressure, thereby indicating the intended use.

[0131] like Figures 21 to 24As shown, in the preferred rod-shaped embodiment of the handheld tool 1, the motor 33 is preferably arranged in the area of ​​the handle 5, and the battery 4 is preferably arranged in the area of ​​the side of the motor 33 facing away from the working head 9 or the tool holder 6. The battery 4, the motor 33, the hydraulic actuator 12 and the working head 9 or the tool holder 6 are preferably arranged together along the longitudinal axis x of the tool 1.

[0132] like Fig.23 As shown, the output shaft 65 of the motor 33 is oriented along the longitudinal axis x, and in order to form a friction gearbox 66, a cage 67 may be provided, in which two wheel-shaped output rotating bodies 68 are rotatably arranged. The rotational geometric axes of the output rotating bodies 68 extend parallel to each other and in the same direction as the longitudinal axis x.

[0133] The output rotating body 68 interacts with the mating tracks 71 and 72 via the tracks 69 and 70 formed by the outer edge chamfers, and the mating tracks 71 and 72 are constructed in the area of ​​two track bodies 73 and 74. The lower track body 73 facing the electric motor 33 is arranged in a rotationally fixed manner and is fixed in the axial direction, while the upper track body 74 is designed to be movable in the axial direction and is also mounted in a rotationally fixed manner.

[0134] The upper rail body 74 is preloaded by a compression spring 75 in the axial direction and in the direction of the output rotor 68 , which is arranged between the rail bodies 73 and 74 as viewed in the axial direction, so that a friction connection exists between the output rotor 68 and the rail bodies 73 and 74 .

[0135] The mating tracks 70 and 71 of the track bodies 73 and 74 can form conical surfaces, wherein the selected counter track 70 of the lower fixed track body 73 can be circular relative to the longitudinal axis x of the tool 1. In contrast, the mating running surface 71 of the upper track body 74, which is held axially movably, deviates from a circular shape, so that an elliptical, wavy progression of the counter track 71 can occur.

[0136] In operation, the friction gearbox 66 constructed in this way accordingly functions as a piston pump which pumps hydraulic fluid into the hydraulic space via a pump piston 76 which, as described above, is constructed so as to be axially displaceable.

[0137] For further embodiments and operating principles of the friction gearbox 66, reference is made to DE 101 24 265 A1. The content of this patent application is hereby fully incorporated into the disclosure of the present solution, including for the purpose of incorporating features of this patent application into the claims of the present solution.

[0138] The pump region 77 in the friction gearbox 66 has an inlet valve 78 and an outlet valve 79 , wherein the inlet valve 78 preferably allows the pump region 77 to be opened to the environment.

[0139] The outlet valve 79 can be connected to an air duct 37 in the tool housing, for example in the form of a hose 39. The air duct 37 can lead through the area of ​​the handle 5 upward to an interface 80 between the free end piece 3 of the tool housing and the battery 4 that is connected or to be connected.

[0140] The air duct 37 can lead to the chamber 18 correspondingly assigned to the interface 80. The chamber 18 can have a chamber opening 81 on the housing side in the area of ​​the interface 80 and is usually opposite to the air duct opening. The geometric center line of the chamber opening 81 can usually extend parallel to the longitudinal axis x (see Fig.24 ).

[0141] The pressure sensor 35 may extend into the chamber 18 , for example, at a location where the air passage 37 opens into the chamber 18 , wherein in this exemplary embodiment, the pressure sensor 35 may also be mounted on a circuit board 38 .

[0142] When the battery 4 is arranged as intended, the chamber opening 81, which is sealed by the annular gasket 82, is pressed against the facing housing wall 83 of the battery 4, wherein an opening 84 provided in the housing wall 83 can connect the air channel 37 in a sealing manner via the chamber 18 to the housing interior 85 of the battery 4. Due to the connection established via the openings 81 and 84, the housing interior 85 can provide a spatial expansion of the chamber 18 that is monitored with respect to the air pressure.

[0143] As a result of the configuration described above, the friction gearbox 66, which acts like an air piston pump during operation in conjunction with the inlet valve 78 and the outlet valve 79, enables, for example, monitoring of the state of the battery housing wall 83. In contrast to the exemplary embodiment described above, an air pressure that can be used for evaluation is achieved in front of the hydraulic actuator 12, in particular bypassing the work head 9 or the tool holder 6, as viewed in the operating direction of the moving part 16.

[0144] Furthermore, the principle of the air piston pump also makes it possible here to convey a greater amount of air via the air duct 37 into the chamber 18 than the air pressure that builds up in the region of the moving part 16 .

[0145] For example, cracks in the battery housing wall 83 may occur due to the handheld tool 1 connected to the battery 4 falling, or even just the battery 4 itself falling. The described solution is able to detect this type of damage (cracks) in the battery housing wall 83, wherein the damage as a whole can be regarded as an indication of damage to the battery 4 as a whole.

[0146] If the air pressure that can be detected by the pressure sensor 35 builds up to at least a predetermined level in the chamber 18 as expected after the motor is started during use, it can be concluded that the battery housing wall 83 is intact and correspondingly not cracked. The chamber 18, which is also provided by the housing interior 85, is closed on all sides and is tightly connected to the chamber opening 81 on the device side.

[0147] If, by contrast, there is no pressure buildup in the chamber 18 or the pressure buildup is not high enough, this is interpreted by the pressure sensor 35 and the evaluation unit, for example, which is arranged on the circuit board 38, as a defect in the region of the battery 4, in particular its housing wall 85. An optical or acoustic signal can indicate to the user that the connected battery 4 may have a defect, for example in the form of a crack. In this way, it can also be indicated that the battery 4 is not connected correctly, for example, because a gap opening is left in the region of the interface 80 that rises toward the environment.

[0148] In order to prevent the air pressure generated when an intact battery 4 is connected as intended from exceeding a predetermined maximum value, a pressure relief valve may be provided, for example, in the region of the air duct 37 or in association with the chamber 18 .

[0149] Reference numerals list

[0150] 1 Handheld tools

[0151] 2 Body tool base

[0152] 3 End Components

[0153] 4 Batteries

[0154] 5. Handle

[0155] 6 Tool holder

[0156] 7 Actuator

[0157] 8 Hydraulic hose

[0158] 9 Working head

[0159] 10 Adapter

[0160] 11 Actuator

[0161] 12 Hydraulic actuator

[0162] 13 Hydraulic pool

[0163] 14 Switch

[0164] 15 Hydraulic space

[0165] 16 Moving Parts

[0166] 17 Return spring

[0167] 18 Chamber

[0168] 19 Piston section

[0169] 20 Radial seal

[0170] 21 Tool carrier

[0171] 22 Tools

[0172] 23 Tools

[0173] 24 Extrusion Profile

[0174] 25 Squeeze Jaw

[0175] 26 Knives

[0176] 27 Cutting Edges

[0177] 28 Extrusion port

[0178] 29 Cutting edge

[0179] 30 Handle

[0180] 31 Handle

[0181] 32 Spindle drive

[0182] 33 Electric Motor

[0183] 34 Articulated structure

[0184] 35 Pressure Sensor

[0185] 36 Opening

[0186] 37 Airway

[0187] 38 Circuit Board

[0188] 39 Hose

[0189] 40 channels

[0190] 41 Washer

[0191] 42 front surface

[0192] 43 Branch Channel

[0193] 44 Casing

[0194] 45 Channel Segment

[0195] 46 Horizontal channel

[0196] 47 pipe section

[0197] 48 channel segment

[0198] 49 Guide section

[0199] 50 Materials

[0200] 51 Horizontal channel

[0201] 52 Horizontal channel

[0202] 53 Washer

[0203] 54 Connection Channels

[0204] 55 Guide surface

[0205] 56 Matching guide surface

[0206] 57 Sealing plug

[0207] 58 Indicator

[0208] 59 Opening

[0209] 60 Transverse components

[0210] 61 Temperature sensor

[0211] 62 Pneumatic Space

[0212] 64 Sensor pipeline

[0213] 65 Output shaft

[0214] 66 Friction drive

[0215] 68 Output Rotating Body

[0216] 69 tracks

[0217] 70 tracks

[0218] 71 Matching track

[0219] 72 Matching track

[0220] 73 Lower orbital body

[0221] 74 Upper orbital body

[0222] 75 Pressure spring

[0223] 76 Pump piston

[0224] 77 Pump area

[0225] 78 Inlet valve

[0226] 79 Outlet valve

[0227] 80 Interface

[0228] 81 Chamber

[0229] 82 Ring washer

[0230] 83 Battery housing wall

[0231] 84 Opening

[0232] 85 Shell interior

[0233] 8 6 Pumps / Compressors

[0234] 87 Electric Motor

[0235] 88 Reflux valve

[0236] 89 Air duct

[0237] 90 Batteries

[0238] 91 Operating parts

[0239] 92 Return spring

[0240] a Transverse path

[0241] s vertical axis

[0242] D Plot

[0243] D1 Pressure Curve

[0244] D2 Pressure Curve

[0245] DS Pressure Peak

[0246] S Sensor

Claims

1. A handheld tool (1) having an actuator (11) and a moving part (16), wherein: The actuator (11) drives the moving part (16) directly or via a gearbox or by a hydraulic medium to perform a predetermined operation, wherein a chamber (18) is constructed in the handheld tool (16), in which an air volume with air pressure is enclosed or can be enclosed, characterized in that the moving part or an opening part independent of the moving part (16) is arranged to change the air pressure by changing the space of the chamber (18) or alternatively by inputting additional air into the chamber (18), wherein the air pressure can be evaluated to identify the state of the handheld tool (16), wherein the moving part (16) can be driven with or without pressure.

2. The handheld tool (1) according to claim 1, characterized in that A pressure sensor (35) is provided, which is arranged to measure the air pressure in the chamber (18) and can evaluate the measured air pressure to detect the state of the handheld tool (1).

3. The hand tool (1) according to claim 1, characterized in that The space of the chamber (18) is changed by moving a wall or a part of a wall of the chamber (18).

4. The hand tool (1) according to claim 1, characterized in that A change in air pressure can be achieved by introducing additional air into the chamber (18).

5. The hand tool (1) according to one of the preceding claims, characterized in that A change in air pressure is associated with the operation.

6. A hand-held tool (1) having an actuator (11) and a moving part (16), wherein: The actuator (11) drives the moving part (16) directly or via a gearbox or by means of a hydraulic medium to perform a predetermined operation, a chamber (18) being constructed in the handheld tool (16), in which an air volume with air pressure is enclosed or can be enclosed, characterized in that the air pressure can be changed and can be evaluated to obtain the state of the handheld tool (1), wherein the operation can be performed independently of the air pressure generated in the chamber (18).

7. The handheld tool (1) according to claim 6, characterized in that A pressure sensor (35) is provided, which is arranged to measure the air pressure in the chamber (18) and can evaluate the measured air pressure to detect the state of the handheld tool (1).

8. The hand-held tool according to claim 1, characterized in that Variation of the air pressure can be achieved by changing the size of the chamber (18).

9. The hand-held tool according to claim 1, characterized in that Variation of the air pressure can be achieved by changing the volume of air enclosed in the chamber (18).

10. The hand-held tool according to claim 1, characterized in that When the operation is triggered or performed, the air pressure changes.

11. The hand-held tool according to claim 1, characterized in that The chamber (18) has a sealable opening (36).

12. The handheld tool according to claim 11, characterized in that: The opening (36) is connected to the chamber (18) via an air passage (37).

13. The hand-held tool according to claim 1, characterized in that The moving component (16) is a traverse component (60) which can be traversed from a traverse start position to a traverse end position.

14. The handheld tool according to claim 13, characterized in that: The transverse movement of the transverse movement member (60) to the transverse end position reduces the volume of the chamber (18).

15. The hand-held tool according to any one of the preceding claims, characterized in that The increase in air pressure is associated with an increase in the temperature of the air volume in the chamber (18).

16. The handheld tool according to claim 15, characterized in that: A temperature sensor (61) is provided for measuring the temperature increase.

17. The handheld tool according to any one of claims 13 to 16, characterized in that The increase in air pressure provides a measure of the traverse path (a).

18. The handheld tool according to any one of claims 15 to 17, characterized in that The increase in air pressure and temperature can be used as a measure for the traverse path (a).

19. The handheld tool according to any one of claims 11 to 18, characterized in that The opening (36) can be sealed by traversing the traversing member (60) to a traversing end position.

20. The handheld tool according to any one of claims 13 to 19, characterized in that The air pressure can be increased by the lateral movement of the lateral movement component (60) to the lateral end position.

21. The handheld tool according to any one of claims 13 to 20, characterized in that The increase in air pressure in the chamber (18) can be recognized as the arrival of the traverse member (60) at the end of the movement.

22. The hand-held tool according to any one of the preceding claims, characterized in that The handheld tool (1) has a working head (9).

23. The handheld tool according to claim 22, characterized in that The working head (9) has a tool (22) with an extrusion profile (24), wherein the extrusion profile (24) has an opening (36).

24. The hand-held tool according to any one of the preceding claims, characterized in that The pressure increase can be regarded as a complete compression of the material (50).

25. The hand-held tool according to any one of the preceding claims, characterized in that The handheld tool (1) has a connected battery (4), and the pressure increase in the chamber (18) can be interpreted as the presence of a correctly connected, undamaged battery (4) on the housing side.

26. The handheld tool according to claim 25, characterized in that Movement of the gearbox can be used to increase the pressure in the chamber.

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