Machine tool, in particular hand-held machine tool

Abstract

The invention relates to a machine tool (10), in particular a hand-held machine tool, comprising a casing and a rechargeable-battery receptacle (20) which forms a rechargeable-battery interface (21), wherein the rechargeable-battery interface (21) comprises a guide (24) having at least one guide face (24.1, 24.2), which are arranged and designed to guide a rechargeable-battery unit (40) in an assembly direction towards an assembly position, and wherein a clamping device (30) is provided which is intended to secure the rechargeable-battery unit (40) in or on the rechargeable-battery interface (21) in the assembly position. In order for the rechargeable-battery unit to be held in the assembly position on the machine tool without backlash, according to the invention the rechargeable-battery interface (21), in particular the guide (24), comprises two abutments (25, 27), arranged so as to be spaced apart in the assembly direction, for supporting the rechargeable-battery unit (40), and the clamping device (30) comprises a clamping element (32) arranged so as to be spaced apart from the two abutments (25, 27) in the assembly direction.

Description

[0001] Machine tool, especially hand tool

[0002] The invention relates to a machine tool, in particular a hand-held power tool, having a battery holder which forms a battery interface, wherein the battery interface has a guide with at least one guide surface which is arranged and designed to guide a battery unit in an assembly direction towards an assembly position, and wherein a clamping device is provided which serves to clamp the battery unit in or on the battery interface in the assembly position.

[0003] The mounting position is understood here to mean that the accumulator unit is arranged on the machine tool in such a way that the machine tool can be operated, i.e. supplied with energy, by means of the accumulator unit.

[0004] To ensure that the battery can be inserted into the battery interface easily and without the risk of jamming or excessive force being applied, the guide must provide sufficient play. This play proves to be disadvantageous in the assembly position. During use, the battery unit of conventional machine tools can move relative to the machine tool housing. This relative movement then causes damage to the electrical contacts formed between the battery unit and the machine tool. Furthermore, the existing play between the battery and the battery interface can cause the vibration behavior of the machine tool to be unpleasant for the user.

[0005] DE 10 2015 226 423 A1 describes a battery-operated

[0006] A handheld power tool, specifically a drill. It has a percussion mechanism in a housing that can drive a tool holder. A replaceable tool can be accommodated in the tool holder. The handheld power tool has a battery interface to which a replaceable battery can be attached. For this purpose, the battery interface has guide bars to which a battery can be initially attached using guide holders and then moved in an assembly direction toward an assembly position. When the battery is in the assembly position, a piezo element is triggered, which actuates an actuator. The actuator can be used to secure and actively clamp the battery in the assembly position.

[0007] It is an object of the invention to provide a machine tool of the type mentioned at the outset, in which the accumulator unit is held reliably in the assembly position.

[0008] This object is achieved in that the accumulator interface, in particular the guide, has two abutments arranged at a distance from one another in the assembly direction for supporting the accumulator unit and in that the clamping device has a clamping element arranged at a distance from the two abutments in the assembly direction.

[0009] With such an arrangement, the accumulator unit can be secured reliably, preferably free of play, in the assembly position. This prevents or at least significantly reduces relative movements that could be detrimental to the electrical contacts. Preferably, the guide play of the guide can be completely eliminated in this way. The solution according to the invention, in particular, allows support to be provided at the two abutments, with the clamping device then applying a clamping force to the accumulator unit at a third location. The support distances formed between the abutments on the one hand and the clamping device and the abutments on the other hand allow the accumulator unit to be tilted relative to the machine tool and thus aligned with or almost free of play.Such an arrangement can be implemented on both sides of the accumulator unit, resulting in a particularly stable and reliable support. It is conceivable that two abutments are arranged on each side of the accumulator unit.

[0010] According to the invention, it can be provided that the machine tool comprises the accumulator unit.

[0011] Preferably, the clamping force of the clamping element is only generated in the last 15%, preferably the last 10%, and particularly preferably the last 5%, of the total insertion travel, i.e., it is applied by the clamping element to the battery unit. This facilitates convenient assembly and disassembly of the battery unit.

[0012] The total insertion path is the distance traveled by the battery unit when inserted into the battery interface in the mounting direction, from the initial contact between the battery unit and the battery interface until it reaches the mounting position. The total insertion path can also be referred to as the mounting distance.

[0013] According to one possible variant of the invention, it can be provided that the clamping element is pivotally mounted by means of a bearing section and has a clamping surface that is held at least partially spaced from the bearing section. As a result, the clamping force for securing the battery unit can be reliably generated and transmitted as a result of a pivoting movement of the clamping element. The clamping element can be arranged with its clamping surface at the front or rear in the area of ​​the guide and / or the battery unit in the assembly direction. If it is provided that the clamping device has a pivotally mounted actuating lever to which a battery stop is directly or indirectly assigned on a support section and that the clamping element is operatively connected to the actuating lever, then a passive adjustment of the actuating element and thus an adjustment of the clamping element is achieved by means of the battery unit.This allows for particularly convenient installation.

[0014] Backlash-free or reduced-backlash clamping of the battery unit is easily achieved if the clamping element generates a clamping force that runs perpendicular to the mounting direction. Additionally or alternatively, the actuating lever can generate a counterforce acting in the opposite direction to the mounting direction. This facilitates disassembly of the battery unit.

[0015] A possible variant of the invention can be such that the actuating lever(s) and the clamping element each form a lever arm of a particularly two-armed lever mechanism. This allows the movement of the accumulator unit, and thus of the actuating lever, to be transmitted effectively and with minimal technical effort, particularly to the clamping element. In particular, this allows sufficiently high clamping forces to be generated. The degree of force amplification can be selected by dimensioning the length of the lever arms. Since the two abutments together with the clamping element also form a lever mechanism, a particularly high force amplification can be generated.

[0016] A possible variant of the invention can be such that the clamping element is spring-loaded relative to the actuating lever in the assembly position, in particular, is elastically adjustable against the preload of at least one tension spring. This allows tolerances to be easily compensated.

[0017] A compact design variant can be such that the tensioning element forms a spring holder and the actuating lever forms a spring receptacle, and that the tension spring is held on the spring holder and the spring receptacle.

[0018] A conceivable variant of the invention may be such that the actuating lever(s) for actuating the clamping element is pivotably mounted around a pivot bearing, and the clamping element is pivotably mounted around the bearing section(s). Preferably, the pivot axes of the pivot bearing and the bearing section are aligned. This ensures simple and precise assembly.

[0019] If the pivotably mounted actuating lever(s) is / are adjustable against the tensioning force of a return spring, in particular about a pivot bearing, wherein, in particular, the return spring can act against a support part on the one hand and is supported relative to the actuating lever on the other hand, and the support part is fixedly supported by a support section directly or indirectly relative to the housing of the machine tool, then disassembly of the accumulator unit is facilitated. The return spring generates an ejection force opposite to the assembly direction, which supports disassembly.

[0020] A variant of the invention can be such that two clamping elements are provided, each having a clamping surface and each adjustable, preferably independently of one another, about an associated bearing section. This enables secure clamping of the accumulator unit if it has two guide areas, in particular longitudinal guide elements, spaced apart from one another transversely to the assembly direction. A clamping element can then be assigned to each guide area.

[0021] A compact design is supported if the two clamping elements are mounted with their bearing sections on a common shaft. Preferably, the support part is arranged between the two clamping elements and supported on the shaft by a bearing piece. This measure also supports simple assembly of the clamping device. If the shaft is mounted in the housing, for example, at opposite shaft ends, the clamping device is easy to install.

[0022] It is particularly advantageous if the housing comprises a first and a second housing part and the clamping device is held between the first and the second housing part, in particular on one side of the first housing part and on the opposite side of the second housing part.

[0023] This allows the clamping device to be inserted into the first housing part even if the second housing part is not mounted on the first housing part. This is particularly advantageous when the clamping device is designed as a module, i.e., as a coherent assembly.

[0024] To reduce the parts and assembly effort, it can be provided that the operating lever(s) and the clamping element are designed as a single piece.

[0025] One possible variant of the invention could be for the accumulator stop to be formed by a shaped element made of a soft, elastic material. This allows vibrations between the accumulator unit and the machine tool to be dampened during operation. Furthermore, elasticity is introduced into the clamping, which can be used to compensate for tolerances and reduce relative movement between the accumulator unit and the clamping device in the assembly position. This effectively reduces or even completely eliminates wear caused by relative movement between the accumulator unit and the clamping device.

[0026] A defined position of the accumulator unit in the accumulator interface can be ensured if the second abutment is arranged between the first abutment and the clamping element of the clamping device in the assembly direction, and if the second abutment protrudes beyond the guide surface, in particular, if it is designed as a projection protruding beyond the guide surface. If the projection is designed as a plateau-shaped elevation, then a flat load transfer and thus a reduction in compressive stresses is achieved.

[0027] A particularly advantageous variant of the invention can be such that the first abutment forms a first bearing surface and the second abutment forms a / the second bearing surface, and that the bearing surfaces are directed away from each other in different directions. In particular, it can be provided that the surface normals directed to the bearing surfaces point in opposite directions. This enables particularly effective and simple clamping of the accumulator unit, for example, together with the clamping element, a rocker-like clamping mechanism.

[0028] As a wear protection measure, it can be provided that the bearing surface of at least one of the abutments consists at least in part of a wear-resistant material, in particular of metal, and / or that the bearing surface of at least one of the abutments consists of a different, in particular a more wear-resistant material, than the at least one guide surface.

[0029] For convenient assembly and / or disassembly of the accumulator unit, it can be provided that the accumulator unit has a stop surface, that the stop surface actuates the clamping unit only over a partial joining area of ​​the overall joining movement of the accumulator unit into the accumulator interface in order to bring the clamping element into its clamping position and into contact with a clamping surface of the accumulator unit, wherein preferably this partial joining area is at the end of the overall joining movement, wherein further preferably the partial joining area amounts to a maximum of 15%, preferably a maximum of 10%, further preferably a maximum of 5% of the overall joining movement.

[0030] If at least one of the abutments is arranged in the region of an electrical connection contact, in particular in the region of a signal contact or a power contact, then the most play-free assignment of the battery unit is guaranteed precisely in this sensitive area. A further independent aspect of the invention relates to a machine tool, in particular a hand-held power tool, comprising a housing, a battery receptacle which forms a battery interface, and a battery unit, wherein the battery interface has a guide with at least one guide surface which is arranged and designed to guide a battery unit in an assembly direction towards an assembly position, and wherein a clamping device is provided on the machine tool which serves to clamp the battery unit in or on the battery interface in the assembly position.

[0031] According to the invention, it is provided that in the region of the accumulator interface, in particular the guide, two abutments arranged at a distance from one another in the assembly direction are arranged to support the accumulator unit and that the clamping device has a clamping element arranged at a distance from the two abutments in the assembly direction.

[0032] It is understood that the above-described inventive features can also be combined with this independent aspect.

[0033] The object of the invention is also achieved with a method for mounting a battery unit on a machine tool, in particular on a hand-held power tool, wherein the battery unit is fastened in or on a battery interface of a battery receptacle of the machine tool, in particular detachably without tools, wherein the battery interface has a guide with at least one guide surface which is arranged and designed to guide a battery unit in a mounting direction towards a mounting position and wherein a clamping device is provided by means of which the battery unit is clamped in or on the battery interface in the mounting position.According to the invention, it is provided that the clamping device is actuated by means of the insertion movement of the accumulator unit along the assembly direction towards the assembly position, and that a clamping force is applied to a clamping surface of the accumulator unit by means of a clamping element on a partial travel path of the insertion movement, wherein the clamping force acts transversely, in particular perpendicularly, to the assembly direction.

[0034] According to a preferred variant of the invention, it can be provided that an actuating lever of the clamping device is adjusted by means of the insertion movement of the accumulator unit to generate the clamping force. This effectively enables a reduction in the vibration level and a reliable signal and / or power transmission.

[0035] As already indicated above, assembly is particularly simple and convenient if it is provided that the accumulator unit actuates the clamping device in the area of ​​the last 15%, preferably in the area of ​​the last 10%, in particular in the area of ​​the last 5%, of the insertion path of the insertion movement and / or that the clamping force is generated in the area of ​​the last 15%, preferably in the area of ​​the last 10%, in particular in the area of ​​the last 5%, of the insertion path of the insertion movement.

[0036] The invention is explained in more detail below with reference to an embodiment illustrated in the drawings. They show:

[0037] Figure 1 shows a perspective view of a machine tool,

[0038] Figure 2 shows the machine tool according to Figure 1 in side view and partly in section with a partially inserted accumulator unit,

[0039] Figure 3 shows the representation according to Figure 2 in a modified

[0040] functional position,

[0041] Figure 4 shows the representation according to Figure 3 in a further modified

[0042] Functional position, Figure 5 a detail of the accumulator interface and the

[0043] clamping device,

[0044] Figures 6 and 7 show a clamping device in different perspective views,

[0045] Figure 8 shows an alternative design of a clamping device in perspective view,

[0046] Figure 9 is a sectional view of the clamping device according to Figure 8 along the cutting plane marked IX-IX in Figure 8,

[0047] Figures 10 and 11 show a further alternative embodiment of a clamping device in perspective view from the front and from the rear,

[0048] Figures 12 and 13 show a further alternative embodiment of a clamping device in perspective view from the front and from the rear

[0049] Figures 14 and 15 show a further alternative embodiment of a clamping device in perspective view from the front and from the rear and

[0050] Figure 16 Housing and clamping device designed as a module of the

[0051] Machine tool according to Figure 1 in partial exploded view

[0052] Figure 1 shows a machine tool 10, which in the present case is designed as a handheld power tool. In the illustrated embodiment, the handheld power tool is a grinder. However, it is also conceivable for the handheld power tool to be another battery-operated machine tool 10, for example a drill, a gardening tool, a saw, a dust extractor, a hammer drill, a cordless screwdriver, a cutting tool, a separating tool, or the like. The following explanations therefore also apply in principle to any other battery-operated machine tool 10. As can be seen from Figure 1, the machine tool 10 has a drive unit 11 that drives a tool carrier 13. The tool carrier 13 can accommodate a tool 13.1, preferably in an interchangeable manner.

[0053] As the figures illustrate, the machine tool 10 can be assigned a chip removal system 12, through which the dust generated during the work process can be extracted and removed in an orderly manner. For this purpose, the chip removal system 12 has a connection piece 12.1 to which a dust extraction system (not shown) can be connected.

[0054] The machine tool 10 has a housing 14 in which individual components, in particular the drive unit 11, are accommodated.

[0055] As shown in Figure 1, the machine tool 10 has a battery receptacle 20, which forms a battery interface 21. The battery interface 21 may be at least partially arranged in the housing 14 or formed by it, as illustrated in Figure 1.

[0056] The battery interface 21 comprises various electrical contacts. The electrical contacts may form signal contacts 22, which serve to transmit signals between a battery unit 40 (see Figure 2) arranged at the battery interface 21 and the control system of the machine tool 10.

[0057] As illustrated in Figure 1, the accumulator interface 21 may have power contacts 23. The power contacts 23 serve to transmit the electrical energy provided by the accumulator unit 40 to the drive unit 11.

[0058] As further illustrated in Figure 1, the accumulator interface 21 may have a guide 24, in particular a linear guide. By means of the guide 24, the accumulator unit 40 can be adjusted or inserted into a mounting position in a mounting direction M (see Figure 2). The mounting position is shown in Figure 4.

[0059] The guide 24 has two guide webs arranged at a distance from one another. These can, for example, be formed integrally with the housing 14 or with a part of the housing 14. The guide webs each have a first guide surface 24.1 and a second guide surface 24.2 on opposite sides. The guide surfaces 24.1, 24.2 extend in the assembly direction M.

[0060] Figure 1 further shows that the accumulator interface 21 can advantageously have a first abutment 25 in front of the guides 24 in the assembly direction M. It can also be the case that the first abutments 25 are formed by the guides 24 or are part of the guides 24. In the present exemplary embodiment, the abutments 25 are formed by separate components, in particular consisting of metal. As the illustration shows, the first abutments 25 can, for example, be plate-shaped. The first abutments 25 can have a first bearing surface 25.1. Additionally or alternatively, it can also be provided that the first abutments 25 have a sliding surface 25.2 opposite the first bearing surface 25.1.

[0061] In the present embodiment, the first bearing surface 25.1 is arranged in alignment with the first guide surface 24.1 and / or the second guide surface 24.2 is arranged in alignment with the sliding surface 25.2 of the first abutment 25.

[0062] In the area of ​​the guide webs of the guides 24 and / or in the area of ​​the first abutments 25, locking receptacles 26 can be provided.

[0063] In the present embodiment, the locking receptacles 26 are formed as recesses in the guide webs. Opposite to the mounting direction, at least one of the locking receptacles 26 is defined by the first abutment 25.

[0064] Figure 1 further shows that the accumulator interface 21 has at least one second abutment 27. In the present embodiment, two second abutments 27 are used. The second abutment(s) 27 form a second bearing surface 27.1.

[0065] The second abutment 27 is formed in this case by the guides 24. For this purpose, the guides 24 have projections, which, as shown in particular in Figure 5, can be designed as plateau-shaped elevations. These elevations protrude beyond the second guide surface 24.2. As Figure 5 illustrates, the plateau-shaped elevation transitions via inclined surfaces on one or both sides into the recessed guide surfaces 24.1 to form sliding surfaces.

[0066] As shown in Figure 2, the accumulator unit 40 can be connected to the machine tool 10. The accumulator unit 40 has a accumulator housing 41. The accumulator cells 49 (see Figure 5) are inserted into the accumulator housing 41. Furthermore, at least one accumulator electronic component can be arranged in the accumulator housing 41. The at least one accumulator electronic component can be electrically connected to the signal contacts 22 when mounted. The power contacts 23 of the accumulator interface 21 are then electrically connected to the connection contacts 46 of the accumulator unit 40.

[0067] The accumulator unit 40 has longitudinal guide elements 44, 45 in the region of its two longitudinal sides. The longitudinal guide elements 44, 45 extend in the assembly direction M and are arranged at a distance from one another perpendicular to the assembly direction M to form a guide groove 49. The guide webs of the guides 24 are accommodated in the guide groove 49, as illustrated in Figure 5.

[0068] In the assembled state, the first guide surfaces 24.1 are opposite the first longitudinal guide element 44 and the second guide surfaces 24.2 are opposite the second longitudinal guide element 45.

[0069] Figure 2 illustrates that the accumulator unit 40 has at least one locking member 43. Preferably, two locking members 43 are arranged on the opposite longitudinal sides of the accumulator housing 41. An unlocking element 42 of the accumulator unit 40 interacts with the locking members 43, such that the associated locking member 43 can be moved from a locked position to an unlocked position using the unlocking element 42.

[0070] In the locked position, the locking member 43 engages the locking receptacle 26 of the battery interface 21 (see Figure 5). If the locking member 43 is moved into the unlocked position, it is moved out of the locking receptacle 26. As shown in Figure 5, the adjustment from the locked position to the unlocked position occurs in a direction perpendicular to the image plane. Accordingly, the locking members 43 are adjusted into the area formed between the guides 24.

[0071] According to the invention, a clamping device 30 is used to securely fix the accumulator unit 40 to the accumulator interface 21. The structure of the clamping device 30 is explained in more detail below with reference to Figures 6 and 7. As these illustrations show, the clamping device 30 comprises at least one clamping element 32 with a clamping surface 32.1. The clamping element 32 has a bearing section 32.2, by means of which it is pivotally mounted, for example, on a shaft 34.

[0072] In the present embodiment, two clamping elements 32 are used, each of which is mounted with its bearing section 32.2 on the common shaft 34. The two clamping elements 32 can preferably be pivoted independently of one another on the shaft 34.

[0073] As shown in Figure ?, the clamping elements 32 have a spring holder 32.3. A tension spring 31.7 is secured to each spring holder 32.3. The tension spring 31.7 can, as shown, be designed as a helical spring or a compression spring. The tension spring 31.7 is supported opposite the spring holder 32.3 on a support section 31 of the clamping device 30. Thus, the clamping element 32 is prestressed by the tension spring 31.7.

[0074] In order to position the clamping element(s) 32 in the position shown in Figures 6 and 7

[0075] To maintain the initial position, the clamping element 32 may be provided with a rotation limiter 32.4. The rotation limiter 32.4 may, for example, abut against a stop of the support section 31, particularly as a result of the pretensioning by the tension spring 31.7, as shown in Figure 6.

[0076] A support part 33 can be arranged in the area between the two clamping elements 32, as shown in the illustrations. The support part 33 can have a bearing piece 33.3 by means of which it is pivotably mounted. Preferably, the bearing piece 33.3 is pivotally mounted on the shaft 34 in the area between the two clamping elements 32.

[0077] The support part 33 may have a support section 33.1, which preferably also forms a spring holder 33.2.

[0078] As Figure 7 shows, the support part 33 is prestressed by a return spring 33.5. For example, the return spring 33.5 may be supported on the support section 31.

[0079] In order to hold the support section(s) 31 in their initial position shown in Figures 6 and 7, the support part 33 may be provided with a support part rotation limiter (not shown). The support part rotation limiter may, for example, rest against the support section 31, particularly as a result of the preload by the return spring 33.5.

[0080] If both the clamping element(s) 32 have the rotation limit 32.4 and the support section(s) 31 have the support part rotation limit, the clamping device 30 can be easily pre-assembled as a module or assembly.

[0081] The support section 31 forms an accumulator stop 31.1. The accumulator stop 31.1 can be formed by a continuous abutment surface or, as shown in Figure 6, this abutment surface can be formed by a partial abutment surface, which are preferably arranged spaced apart from one another in the direction of the shaft axis 34. The support section 31 is pivotally mounted on the clamping device 30, for which purpose it preferably has two pivot bearings 31.3 arranged spaced apart from one another. As shown in Figures 6 and 7, the pivot bearings 31.3 can also be pivotally mounted on the shaft 34.

[0082] Adjacent to the pivot bearings 31.3, the support section 31 has an actuating lever 31.2. This actuating lever 31.2 holds the accumulator stop

[0083] 31.1 at a distance from the pivot axis of the pivot bearing 31.3. Thus, the operating lever 31.2 together with the clamping element(s) 32 forms a two-arm lifting mechanism. The first lever arm is actuated by the operating lever

[0084] 31 .2 with the accumulator stop 31 .1 and the second lever is formed by the clamping element 32 with the clamping surface 32.1.

[0085] The support section 31 preferably has a connecting section 31.5 which connects the two actuating levers 31.2 to one another, resulting in a compact and stable construction.

[0086] As Figure 7 shows, the connecting section 31.5 may form spring holders 31.8 on its side facing the tensioning elements 32, on which the tension springs 31.7 are supported. Additionally or alternatively, a spring receptacle 31.6 of the support section 31 may be formed in the area between the spring holders 31.8. This spring receptacle 31.6 may also be formed by the connecting section 31.5. The return spring 33.5 is supported on the spring receptacle 31.6. It may also be designed as a helical spring or compression spring.

[0087] To assemble the clamping device 30, first the shaft 34 is placed on one of the pivot bearings 31.3 of the support section 31. Then, the clamping element 32 assigned to this pivot bearing 31.3 is aligned with its bearing section 32.2 in alignment with the pivot bearing 31.3. This allows the shaft 34 to be pushed through the pivot bearing 31.3 and bearing section 32.2. Subsequently, in the same manner, the support part 33 with its bearing piece 33.3 and the second clamping element 32 with its bearing section 32.2 are aligned with the shaft 34 so that the shaft can be fully inserted and pushed through the second pivot bearing 31.3 of the support section 31. Finally, the return spring 33.5 and the tension springs 31.7 are inserted.

[0088] The assembled unit, which can also be referred to as a module, can be inserted into the housing 14 of the machine tool 10. First, one shaft end of the shaft 34 is inserted into a shaft receptacle, for example of the housing 14, in particular of a first housing part 14.1. Subsequently, the opposite shaft end of the shaft 34 is inserted into another shaft receptacle of the machine tool, in particular of a second housing part 14.2, as shown in Figure 16. For example, the two shaft receptacles can be formed by housing parts of the housing 14, in particular the first and second housing parts 14.1, 14.2, which, in the assembled state, form shaft receptacles that are aligned with one another. This considerably simplifies assembly. The two housing parts, i.e. the first and second housing parts 14.1 and 14.2, can then be screwed together to secure the unit in the housing 14.

[0089] In the assembled state, the clamping device 30 rests with its support part 33 against a stop of the machine tool. The support part 33 rests against the stop of the machine tool with a contact surface 33.4 of the support section 33.1, as shown in Figure 2.

[0090] As shown in Figure 1, the two clamping elements 32 with their clamping surfaces 32.1 protrude into the area of ​​the accumulator interface 21.

[0091] To assemble the accumulator unit 40, its longitudinal guide elements 44, 45 are attached to the guide webs of the guides 24 of the accumulator interface 21 at the ends. In the present exemplary embodiment, the longitudinal guide elements 44, 45 are attached to the accumulator interface 21 at the ends in such a way that the longitudinal guide elements 44, 45 are opposite the associated surfaces of the first abutments 25 on both sides of the accumulator unit 40. Thus, the longitudinal guide element 44 is opposite the sliding surface 25.2 and the longitudinal guide element 45 is opposite the first bearing surface 25.1. The accumulator unit 40, attached to the accumulator interface 21 in this way, can now be inserted into the accumulator interface 21 in the assembly direction M. The longitudinal guide elements 44, 45 slide along the associated guide surfaces 24.1, 24.2. Figure 2 shows the partially inserted position of the accumulator unit 40.If the accumulator unit 40 is now further displaced, i.e. inserted into the accumulator interface 21, it hits the accumulator stop 31.1 of the clamping device 30 with a front stop surface 47. This is shown in Figure 3.

[0092] If the accumulator unit 40 is now pushed further in the assembly direction M, the accumulator unit 40 adjusts the support section 31 through the insertion movement. This pivots about the pivot axis of its pivot bearing 31.3.

[0093] According to the illustrated embodiment, the return spring 33.5 may be tensioned. Thus, the return spring 33.5 introduces a restoring force into the support section 31 that acts opposite to the mounting direction M. The support section 31 is thus pivoted counter to the preload force of the return spring 33.5. The return spring 33.5 is thus increasingly preloaded by the insertion movement of the accumulator unit 40.

[0094] Since the tension springs 31.7 are also supported relative to the tensioning element 32, the tensioning elements 32 are also pivoted. This occurs essentially force-free until the clamping surfaces 32.1 meet the associated clamping surfaces 48 of the accumulator unit 40.

[0095] In other words, up to the position shown in Figure 3, the assembly of the accumulator unit 40 in the accumulator interface 21 in the assembly direction M preferably took place essentially force-free up to this point, i.e., without any counterforce from the clamping device 30 being noticeable to the user, but only the frictional forces in the guide 24 need to be overcome. This essentially force-free assembly path in the assembly direction M amounts to at least 80% of the entire assembly path, preferably at least 90% of the entire assembly path, particularly preferably at least 95% of the entire assembly path.

[0096] If, after the clamping elements 32 with their clamping surfaces 32.1 meet the stop surfaces 47 of the accumulator unit 40, the accumulator unit 40 is moved further in the assembly direction M, the support section 31 pivots further and the clamping surfaces 32.1 of the clamping elements 32 are pressed onto the clamping surfaces 48 of the accumulator unit 40. Since the movement of the clamping elements 32 is now blocked at the stop surfaces 47, the tension springs 31.7 are simultaneously tensioned. This tensions the accumulator unit 40 and securely fixes it in the accumulator interface 21.

[0097] According to the illustrated embodiment, the return spring 33.5 may also be further tensioned at the same time. After the clamping surfaces 32.1 meet the associated clamping surfaces 48 of the accumulator unit 40, both the return spring 33.5 and the tension springs 31.7 exert a restoring force on the support section 31, which acts opposite to the assembly direction M.

[0098] The assembly process is complete as soon as the locking element(s) 43 engage with the locking receptacles 26. Then the signal contacts 22 and the power contacts 23 are also fully connected.

[0099] As described above, the return spring 33.5 can generate a force opposite to the assembly direction M, such that the locking members 43 in the locking receptacles 26 are pressed against the first abutments 25, resulting in a play-free position opposite to the assembly direction M. If the first abutments 25 are made of a wear-resistant material or are encased in a wear-resistant material, for example metal, high clamping forces can be transmitted here for the purpose of securely fixing the battery unit 40, without causing damage to the first abutments 25. As Figure 5 illustrates, the clamping device 30, with its at least one clamping element 32, applies a clamping force to the clamping surface 48 of the battery unit 40. As a result, theThe longitudinal guide elements 44 of the accumulator unit 40 are pressed against the second abutment 27, which is arranged at a distance from the clamping element 32 in the assembly direction M. A lever arm is formed between the second abutment 27 and the clamping element 32. Due to the clamping force applied by the clamping element 32, a torque is generated which pivots the accumulator unit 40 in Figure 5 counterclockwise around the second abutment 27. Thus, the two longitudinal guide elements 44, 45 of the accumulator unit 40 are also tilted.

[0100] This causes the longitudinal guide element 45 to strike the first bearing surface 25.1 of the first abutment 25 at its end and to be clamped there. A gap is formed between the second abutment 27 and the first abutment 25, so that a lever arm is also created here, via which torque can be transmitted. Thus, the accumulator unit 40 is clamped in the accumulator interface 21 at three clamping points spaced apart in the assembly direction M, namely, firstly, in the region of the at least one clamping element 32, secondly, in the region of the at least one second abutment 27, and furthermore in the region of the at least one first abutment 25.

[0101] The length of the lever arms can be determined by the position of the clamping points. This allows the degree of force amplification, i.e., the transmission of the clamping force of at least one clamping element 32 to the clamping points, to be appropriately determined.

[0102] Preferably, the first abutment 25 (or the first abutments 25) and / or the second abutment (or the second abutments 27) are arranged in the area of ​​the power contact 23 or the signal contact 22. This arrangement ensures that no or only minimal relative movements can occur between the contact partners during operation of the machine tool 10. This guarantees high operational reliability. Since, in the present exemplary embodiment, the accumulator interface 21 uses two guides 24, the clamping takes place at three clamping points on both sides of the accumulator unit 40. Thus, the accumulator unit is secured in the accumulator interface 21 without play and is stable against tilting. This makes it possible to transmit the highest mechanical stresses acting on the accumulator unit 40.In particular, the vibrations generated by the machine tool 10 can be transmitted without damaging the power contacts 23 or the signal contacts 22.

[0103] The assembly of the accumulator unit 40 is designed to be particularly simple. As usual, the accumulator unit 40 can be inserted into the accumulator interface 21 in the assembly direction M with essentially no force over a significant portion of the assembly movement. Only in a small portion of the assembly path, namely in the last part of the assembly path, preferably in the last 10%, particularly preferably the last 5% of the assembly path, does the counterforce caused by the clamping device 30 have to be overcome. This is not perceived as disturbing by the user.

[0104] To disassemble the accumulator unit 40, the at least one locking member 43 is unlocked by means of the unlocking element 42. This disengages it from the locking receptacle 26. The accumulator unit 40 can then be adjusted counter to the assembly direction. This adjustment movement is assisted by the return spring 33.5. In addition, the return spring 33.5 also returns the clamping device 30 to the starting position shown in Figure 1. This return movement can be limited, for example, by a pivot limiter 31.4 of the clamping device 30 (see Figure 7). This pivot limiter 31.4 can, for example, be provided on the support section 31 and abut against a counter-stop of the housing 14 of the machine tool 10.

[0105] Figures 8 and 9 show an alternative design variant of a clamping device 30. The structure and function of this clamping device 30 essentially correspond to the clamping device 30 shown in Figures 6 and 7. Reference can therefore be made to the above explanations. Therefore, only the differences will be discussed below.

[0106] As the illustrations show, the support section 31 of the clamping device 30 is modified such that the accumulator stop 31.1 is formed by a separate component which is made, at least in part, of a soft-elastic material, for example a rubber material. This separate component can be formed, for example, by a molded body 50 having a base body 51. As Figure 9 illustrates, the base body 51 can have plug-in projections 52 on opposite sides which are inserted into corresponding receptacles in the support section 31. On the rear side, the molded body 50 forms a holding projection 53 which is also secured in a holder of the support section 31. On its front side, the molded body 50 has the accumulator stop 31.1.

[0107] Figures 10 and 11 show a further embodiment of a clamping device 30 according to the invention. Here, too, identical components are designated by identical reference numerals, so that reference can be made to the above explanations. Therefore, only the differences will be discussed below.

[0108] As Figures 10 and 11 illustrate, the support section 31 and the clamping element 32 are connected to one another in one piece to form a two-armed lever. The support section 31 again forms an accumulator stop 31.1 on the front side, which can be split into two parts, as shown in Figure 11.

[0109] The one-piece embodiment according to Figures 10 and 11 offers the advantage that the mass of the clamping device 30, in particular of the moving components, can be reduced.

[0110] As the illustrations show, within the scope of the invention, a tension spring 31.7 in the form of a deformable, in particular soft-elastic material is provided for the tension spring 31.7 to compensate for any tolerances, for example in the region of the transition between the clamping surface 32.1 of the clamping element 32 and the associated clamping surface 48 of the accumulator unit 40 and / or in the transition between the accumulator stop 31.1 and the associated stop surface 47 of the accumulator unit 40. In the present exemplary embodiment, two tension springs 31.7 in the form of sleeves are provided, which are pushed onto the ends of the shafts 34. The shafts 34 are integrally formed on the support section 31. By means of the sleeves, the clamping device 30 can also be mounted on both sides in the machine tool 10, in particular in the housing 14 of the machine tool 10.

[0111] As the illustrations further show, within the scope of the invention, the return spring 33.5 (and / or the tension spring 31.7) for generating a restoring force on the battery stop 31.1 can also be formed by a component-internal structure. In the present exemplary embodiment, this component-internal structure is formed by the actuating lever 31.2, which can deform elastically.

[0112] Figures 12 and 13 show a further embodiment of a clamping device 30 according to the invention. Here, too, identical components are designated by identical reference numerals, so that reference can be made to the above explanations. Therefore, only the differences will be discussed below.

[0113] As the illustrations show, as in the embodiment according to Figures 10 and 11, the support section 31 and the clamping element 32 are connected to one another in one piece. Shafts 34 are provided on both opposite sides of this component, with the axes of these shafts 34 being aligned with one another.

[0114] A support part 33 is pivotally connected to the support section 31. For this purpose, the support part 33 has two bearing pieces 33.3, by means of which it is pivotally mounted on the shafts 34. The support part 33 has support sections 33.1, each carrying a spring holder 33.2. However, it is also conceivable for only one of the support sections 33.1 to have a spring holder 33.2. A spring, for example the tension spring 31.7 (not shown), can be supported on the spring holder 33.2. The other end of this spring is supported on the housing side of the machine tool 10 in order to introduce a preload into the support part 33.

[0115] The clamping device 30 can be mounted in the housing 14 of the machine tool 10 by means of a bearing shaft 33.7. The bearing shaft 33.7 is attached to at least one bearing projection 33.6 of the support part 33. In the present embodiment, two spaced-apart bearing projections 33.6 are each provided on a support section 33.1. The clamping device 30 can be pivotally mounted in the housing 14 of the machine tool 10 by means of the two ends of the bearing shaft 33.7.

[0116] When the accumulator unit 40 is inserted into the accumulator interface 21, it encounters the accumulator stop 31.1, causing the actuating lever 31.2 to pivot by means of the pivot bearing 31.3. This also adjusts the clamping element 32 and, as in the other embodiments, generates a clamping force acting transversely to the assembly direction (guide direction). To compensate for any tolerances, the support part 33 can deflect against the preload of the tension spring 31.7 (not shown).

[0117] As the drawings illustrate, the at least one tension spring 31.7 serves to compensate for any tolerances. At the same time, however, the at least one tension spring 31.7 can also assume the function of the return spring 33.5 and generate a return force on the support section 31, opposite to the assembly direction. This supports the disassembly of the accumulator unit.

[0118] Figures 14 and 15 show a further embodiment of a clamping device 30 according to the invention. Here, too, identical components are designated by identical reference numerals, so that reference can be made to the above explanations. Therefore, only the differences will be discussed below.

[0119] As the drawings illustrate, a support part 33 acts on the support section 31, which can again be integrally connected to the clamping element 32. The support part 33 is pivotally connected to the support section 31 on both sides by means of bearing pieces 33.3.

[0120] The bearing pieces 33.3 are each connected to a guide device with associated support sections 33.1. The guide device enables a translational, in particular linear, adjustment of the support sections 33.1 relative to the bearing pieces 33.3. This adjustment occurs against the preload of a return spring 33.5. Using the support sections 33.1, the clamping device 30 can be fixedly mounted in the housing 14 of the machine tool 10. As the illustrations illustrate, the support sections 33.1 can each have a spring holder 33.2 for supporting the return spring 33.5.

[0121] When the support section 31 is adjusted as a result of assembly of the accumulator unit 40, a clamping force transverse to the assembly direction is again generated by the clamping elements 32. If, for example, due to tolerances or deliberately, the preload force of the return springs 33.5 is overcome when a certain pivot angle of the actuating lever 31.2 is exceeded, the position of the shafts 34 is also adjusted, counteracting the preload of the return springs 33.5. This allows tolerances to be compensated or a restoring force to be generated. In particular, the return springs 33.5 can thus at least partially assume the function of the tension springs 31.7 (tolerance compensation).

Claims

Claims 1. A machine tool (10), in particular a hand-held power tool, comprising a housing (14) and a battery receptacle (20) forming a battery interface (21), wherein the battery interface (21) comprises a guide (24) with at least one guide surface (24.1, 24.2) arranged and designed to guide a battery unit (40) in an assembly direction toward an assembly position, and wherein a clamping device (30) is provided which serves to clamp the battery unit (40) in or on the battery interface (21) in the assembly position, characterized in that the battery interface (21), in particular the guide (24), comprises two abutments (25, 27) arranged at a distance from one another in the assembly direction for supporting the battery unit (40), and in that the clamping device (30) comprises a clamping element arranged at a distance from the two abutments (25, 27) in the assembly direction. (32).

2. A machine tool (10), in particular a hand-held power tool, comprising a housing (14), a battery receptacle (20) forming a battery interface (21), and a battery unit (40), wherein the battery interface (21) has a guide (24) with at least one guide surface (24.1, 24.2) arranged and designed to guide a battery unit (40) in an assembly direction toward an assembly position, and wherein a clamping device (30) is provided on the machine tool, which serves to clamp the battery unit (40) in or on the battery interface (21) in the assembly position, characterized in that in the region of the battery interface (21), in particular of the guide (24), two abutments (25, 27) arranged at a distance from one another in the assembly direction are arranged to support the battery unit (40), and that the clamping device (30) has a clamping element (32) arranged at a distance from the two abutments (25, 27) in the assembly direction.

3. Machine tool according to claim 1 or 2, characterized in that the clamping element (32) is pivotally mounted by means of a bearing section (32.2) and has a clamping surface (32.1) which is held at least partially spaced from the bearing section (32.2).

4. Machine tool according to one of claims 1 to 3, characterized in that the clamping device (30) has a pivotably mounted actuating lever (31.2), on a support section (31) of which an accumulator stop (31.1 ) is directly or indirectly assigned and that the clamping element (32) is operatively connected to the actuating lever (31.2).

5. Machine tool according to one of claims 1 to 4, characterized in that a clamping force is generated by means of the clamping element (32) which runs transversely to the mounting direction and / or that a counterforce acting opposite to the mounting direction is generated by means of the actuating lever (31.2).

6. Machine tool according to one of claims 1 to 5, characterized in that the / an actuating lever (31.2) and the clamping element (32) each form a lever arm of a two-armed lever mechanism.

7. Machine tool according to claims 4 to 6, characterized in that the clamping element (32) in the assembly position relative to the actuating lever (31 .2) is spring-loaded, in particular resiliently adjustable against the preload of at least one tension spring (31 .7).

8. Machine tool according to one of claims 4 to 7, characterized in that the clamping element (32) comprises a spring holder (32.3) and the actuating lever (31 .2) forms a spring receptacle (31 .6), and that the tension spring (31 .7) is held on the spring holder (32.3) and the spring receptacle (31.6).

9. Machine tool according to one of the preceding claims, characterized in that the / an actuating lever (31.2) is pivotally mounted about a pivot bearing (31.3) and the clamping element (32) is pivotally mounted about the / a bearing section (32.2), wherein it is preferably provided that the pivot axes of the pivot bearing (31.3) and the bearing section (32.2) are aligned with one another.

10. Machine tool according to one of the preceding claims, characterized in that the / a pivotably mounted actuating lever (31.2) is / are adjustably mounted against the tensioning force of a return spring (33.5), in particular about a / the pivot bearing (31.3), wherein it can be provided in particular that the return spring (33.5) acts on the one hand against a support part (33) and on the other hand is supported relative to the actuating lever (31.2), and that the support part (33) is supported in a stationary manner with a support section (33.1) directly or indirectly relative to the housing (14) of the machine tool (10).

11. Machine tool according to one of claims 1 to 10, characterized in that two clamping elements (32) are provided, each having a clamping surface (32.1) and which are adjustable independently of one another about an associated bearing section (32.2).

12. Machine tool according to claim 11, characterized in that the two clamping elements (32) are mounted with their bearing sections (32.2) on a common shaft (34), wherein it is preferably provided that the support part (33) is arranged between the two clamping elements (32) and is mounted on the shaft (34) with a bearing piece (33.3).

13. Machine tool according to one of claims 1 to 12, characterized in that the / an actuating lever (31.2) and the clamping element (32) are formed in one piece.

14. Machine tool according to one of the preceding claims, characterized in that the accumulator stop (31.1) is formed by a shaped element (50) consisting of a soft elastic material.

15. Machine tool according to one of claims 1 to 14, characterized in that the second abutment (27) is arranged in the assembly direction between the first abutment (25) and the clamping element (32) of the clamping device (30), that the second abutment (27) projects beyond the guide surface (24.2), in particular is designed as a projection projecting beyond the guide surface (24.2).

16. Machine tool according to one of claims 1 to 15, characterized in that the first abutment forms a first bearing surface (25.1) and the second abutment (27) forms a / the second bearing surface (27.1), and that the bearing surfaces (25.1, 27.1) are directed away from one another in different directions, wherein it can be provided in particular that the surface normals directed onto the bearing surfaces (25.1, 27.1) point in directions facing away from one another.

17. Machine tool according to one of claims 1 to 16, characterized in that the bearing surface (25.1, 27.1) of at least one of the abutments (25, 27) consists at least in regions of a wear-resistant material, in particular of metal, and / or that the bearing surface (25.1, 27.1) of at least one of the abutments (25, 27) consists of a different, in particular a more wear-resistant, material than the at least one guide surface (24.1, 24.2).

18. Machine tool according to one of claims 1 to 17, characterized in that the accumulator unit (40) has a stop surface (47), that the stop surface (47) actuates the clamping unit (30) only over a partial joining area of ​​a total joining movement of the accumulator unit (40) into the accumulator interface (21) in order to move the clamping element (32) into its clamping position and to rest on a clamping surface (48) of the accumulator unit (40), wherein preferably this partial joining region is at the end of the overall joining movement, wherein further preferably the partial joining region amounts to a maximum of 15%, preferably a maximum of 10%, further preferably a maximum of 5% of the overall joining movement.

19. Machine tool according to one of claims 1 to 18, characterized in that, in particular in the direction of the assembly direction, at least one of the abutments (25, 27) is arranged in the region of an electrical connection contact, in particular in the region of a signal contact (22) or a power contact (23).

20. Machine tool according to one of claims 1 to 19, characterized in that the clamping element (32) and / or the actuating lever (31 .2) are mounted directly or indirectly on the housing (14).

21. Machine tool according to one of claims 1 to 20, characterized in that the clamping element (32) and / or the actuating lever (31.2) is / are mounted on a lever element, which in turn is mounted on the housing (14).

22. Machine tool according to one of claims 1 to 21, characterized in that the housing (14) has a first and a second housing part (14.1.14.2) and the clamping device (30) is held between the first and the second housing part (14.1, 14.2), in particular on one side of the first housing part (14.1) and on the opposite side of the second housing part (14.2).

23. Machine tool according to claim 22, characterized in that the clamping device (30) can be inserted into the first housing part (14.1) when the second housing part (14.2) is not mounted on the first housing part (14.1).

24. Machine tool according to one of claims 1 to 23, characterized in that the machine tool comprises the accumulator unit (40).

25. Method for mounting a battery unit (40) on a machine tool (10), in particular on a hand-held power tool, wherein the battery unit (40) is fastened in or on a battery interface (21) of a battery receptacle (20) of the machine tool (10), wherein the battery interface (21) has a guide (24) with at least one guide surface (24.1, 24.2) which is arranged and designed to guide a battery unit (40) in an assembly direction towards an assembly position and wherein a clamping device (30) is provided, by means of which the battery unit (40) is clamped in or on the battery interface (21) in the assembly position, characterized in that the clamping device (30) is actuated by means of an insertion movement of the battery unit (40) along the assembly direction towards the assembly position, and in that a clamping force is applied to a clamping surface (48) of the battery unit (40) by means of a clamping element (32) on a partial travel path of the insertion movement, wherein the clamping force acts transversely, in particular perpendicularly, to the assembly direction.

26. The method according to claim 25, characterized in that the accumulator interface (21), in particular the guide (24), has two abutments (25, 27) arranged at a distance from one another in the assembly direction for supporting the accumulator unit (40) and that the clamping element (32), which applies the clamping force to the accumulator unit (40), is arranged at a distance from the two abutments (25, 27) in the assembly direction.

27. Method according to claim 25 or 26, characterized in that by means of the insertion movement of the accumulator unit (40) an actuating lever (31.2) of the clamping device (30) is adjusted to generate the clamping force.

28. Method according to one of claims 25 to 27, characterized in that the accumulator unit (40) actuates the clamping device (30) in the region of the last 15%, preferably in the region of the last 10%, in particular in the region of the last 5%, of the insertion path of the insertion movement and / or that the clamping force is generated in the region of the last 15%, preferably in the region of the last 10%, in particular in the region of the last 5%, of the insertion path of the insertion movement.

29. Method according to one of claims 25 to 28 with a machine tool according to one of claims 1 to 20.

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