Additional handle device and hand-held power tool system

Abstract

The invention relates to an additional handle device for a hand-held power tool, comprising: at least one fastening base body, which is provided for being arranged directly on the hand-held power tool and which has at least one locking contour; at least one handle base body rotatably supported relative to the fastening base body in at least one operating state, the handle base body having at least one gripping surface and at least one locking contour configured corresponding to the locking contour of the fastening base body; and at least one locking unit, which has at least one locking element, in particular a locking lever, for the releasable anti-rotation fixation of the handle base body relative to the fastening base body. According to the invention, at least one force application element is provided, which is provided for applying a force directed from the handle base body in the direction of the fastening base body to the handle base body. The invention also relates to a corresponding hand-held power tool system.

Description

Technical Field

[0001] The present application relates to an additional handle device and a handheld power tool system. Background Art

[0002] There is already an additional handle device for a hand-held power tool, which has at least one fastening base body, which is configured to be arranged directly on the hand-held power tool and has at least one locking contour; at least one handle base body that is supported so as to be rotatable relative to the fastening base body in at least one operating state, the handle base body having at least one gripping surface and at least one locking contour configured corresponding to the locking contour of the fastening base body; and at least one locking unit, which has at least one locking element, in particular a locking lever, for releasably preventing the handle base body from rotating relative to the fastening base body. Summary of the Invention

[0003] The present invention is based on an additional handle device for a hand-held machine tool, which has at least one fastening base body, which is configured to be arranged directly on the hand-held machine tool and has at least one locking contour; at least one handle base body that is supported so as to be rotatable relative to the fastening base body in at least one operating state, the handle base body having at least one gripping surface and at least one locking contour configured corresponding to the locking contour of the fastening base body; and at least one locking unit, which has at least one locking element, in particular a locking lever, for releasable anti-rotational fixing of the handle base body relative to the fastening base body.

[0004] It is proposed that the additional handle device has at least one force-applying element, which is configured to apply a force to the handle base body directed from the handle base body toward the fastening base body. Preferably, the force-applying element is configured to bring a stop contour of the handle base body into engagement or maintain engagement with a stop contour of the fastening base body. The force of the force-applying element is preferably independent of the stop position of the stop unit. The force-applying element preferably presses the handle base body toward the fastening base body. However, it is also conceivable that the force-applying element pulls the handle base body toward the fastening base body.

[0005] In this context, an "additional handle device" should be understood in particular to mean a device that is configured to be removably connected to a handheld power tool and that forms at least one additional handle for the handheld power tool. The additional handle device can be configured to be optional or required for the operation of the handheld power tool. Preferably, the additional handle device is configured to be required for at least one operating state of the handheld power tool. Therefore, it is particularly conceivable that the handheld power tool can access additional operating modes and / or higher power levels when the additional handle device is installed. The additional handle device is preferably configured to be detachable from the handheld power tool and / or adjustable for transport. The additional handle device is preferably configured to comprise an additional handle, particularly a lever handle and / or a bow handle. A "handheld power tool" should be understood in particular to mean a machine for machining a workpiece, but advantageously includes an electric drill, a chisel and / or a hammer (hammer), a saw, a planer, a screwdriver, a milling machine, a grinder, an angle grinder, a garden tool, and / or a multi-tool. The handheld power tool is preferably configured as an angle grinder. However, other configurations that appear appropriate to a person skilled in the art for handheld power tools are also conceivable.

[0006] The fastening base is particularly configured to be arranged directly on a handheld machine tool. The fastening base can preferably be fixedly connected to the handheld machine tool or removably connected. The fastening base is preferably removably connected to the handheld machine tool, especially to the auxiliary handle interface of the handheld machine tool. The fastening base preferably has an interface unit for removably connecting the auxiliary handle device to the handheld machine tool. In this context, "interface unit" should be understood in particular as a unit configured to removably connect the auxiliary handle device to the handheld machine tool. The auxiliary handle device can preferably be removably mechanically connected to the handheld machine tool via the interface unit. The interface unit particularly has a mechanical interface element, which is configured to cooperate with a corresponding interface element of the handheld machine tool. For connection, the mechanical interface element of the interface unit is preferably configured to cooperate with the interface element of the handheld machine tool in a form-locking and / or force-locking manner. The interface element of the interface unit is preferably composed of a column, in particular a threaded column, which can be inserted and / or screwed into a receiving portion of the interface element. In this context, "removable" should be understood in particular as "non-destructively separable." In a particularly preferred embodiment, the at least one receiving unit is at least partially provided for a tool-free detachable coupling of the handle device and the fastening unit.

[0007] The handle base body in particular forms the actual handle body of the additional handle device and has a gripping area that is provided for direct gripping by an operator. The gripping area is preferably provided for gripping by an operator with one hand. The gripping area preferably comprises in particular an at least approximately cylindrical gripping surface.

[0008] In this context, a "stop profile" is to be understood in particular as a form-locking profile, in particular a surface profile, which is arranged to cooperate with a corresponding stop profile to prevent relative rotation. In a state coupled with the corresponding stop profile, the stop profile is preferably in particular arranged to form a form-locking connection with the corresponding stop profile, in particular to form a form-locking connection with it in the circumferential direction. The stop profile is preferably, for example, composed of a wave profile, a tooth profile or the like arranged on the end face and surrounding in the circumferential direction. The stop profile is in particular arranged to prevent relative rotation between the components in a state coupled with the corresponding stop profile. The stop profile is preferably arranged to form contact with another stop profile for stopping, so that the stopping force can be transmitted through the two stop profiles. "Form-locking" is to be understood in particular as the surfaces of the components that are in a form-locking connection with each other exerting a retaining force on each other in the normal direction of the surfaces. In particular, the components are in a geometrically meshed state with each other.

[0009] In this context, a "locking unit" is to be understood as meaning, in particular, a unit that prevents adjustment, in particular rotation, of the handle base during operation while simultaneously enabling adjustment, in particular rotation, of the handle base when required. The locking unit, in particular its locking element, preferably has a closed position and an open position, wherein in the closed position, the two locking contours engage with each other captive. In the open position, the two locking contours are preferably disengaged from each other. The locking element is preferably formed as a locking lever, wherein the locking element is in the closed position or the open position depending on the pivot position.

[0010] Furthermore, in this context, a "force-applying element" is to be understood in particular as an element which is provided for applying a directed, in particular actual, force to the handle base. For this purpose, the force-applying element preferably has a support point. The force-applying element is preferably formed by a spring element. A "spring element" is to be understood in particular as a macroscopic element which has at least an extension which, under normal operating conditions, can elastically vary by at least 10%, in particular by at least 20%, preferably by at least 30% and particularly advantageously by at least 50%, and which in particular generates a reaction force which is associated with and preferably proportional to the variation in the extension and which counteracts the variation. The "extension" of an element is to be understood in particular as the maximum distance between two points of a perpendicular projection of the element onto a plane. A "macroscopic element" is to be understood in particular as an element which has an extension of at least 1 mm, in particular at least 5 mm, preferably at least 10 mm.

[0011] “Provided” is to be understood in particular as being specially programmed, designed and / or equipped. An object being provided for a specific function is to be understood in particular as meaning that the object fulfills and / or performs this specific function in at least one application state and / or operating state.

[0012] The design of the additional handle device according to the present invention makes it possible, in particular, to advantageously and reliably adjust the handle base. Furthermore, unintentional adjustment of the handle base can be avoided, even when the locking unit is in the open position. To perform the adjustment, the handle base must preferably be pulled axially outward, in particular against the force of the force-applying element.

[0013] It is further proposed that the force-applying element be formed by a compression spring. The force-applying element is preferably formed by a coil spring, in particular a coil compression spring. However, other configurations of the force-applying element considered appropriate by a person skilled in the art are also conceivable. The force-applying element is preferably arranged between the stop element and the handle base. This makes it possible to provide a particularly advantageous force-applying element. In particular, a force-applying element that is advantageously easy to install and cost-effective can be provided.

[0014] It is further proposed that the locking unit comprises: at least one fastening element, in particular a fastening screw, which is fixedly connected to the fastening base; and at least one shaft directly connected to the fastening element, the shaft being configured to rotatably support the locking element. The shaft preferably has a central axis extending perpendicularly to the central axis of the fastening element. The shaft preferably has a radial hole through which the fastening element extends in the installed state. The fastening element preferably has a head, in particular a screw head, particularly preferably a cylindrical screw head, having a diameter that is enlarged relative to the shank and / or the thread. The shaft preferably rests on the head of the fastening element. Particularly preferably, the shaft has a step in the radial hole, on which the head of the fastening element rests. The shaft is preferably pressed against the head of the fastening element by a force-applying element on the fastening element. The shaft is particularly configured to directly rotatably support the locking element. The locking element preferably has a shaft recess, in which the shaft is rotatably supported relative to the locking element. The locking element is preferably pivotally supported by the shaft. The fastening element preferably extends at least partially through the handle base body. In this way, an advantageously designed locking unit can be provided.

[0015] It is further proposed that the locking element is supported so as to be rotatable about an axis of rotation, wherein the locking element has an eccentric profile relative to the axis of rotation. The center axis of the shaft preferably constitutes the axis of rotation for the locking element. The locking element preferably has an axis receptacle, which is arranged to surround the shaft. The axis receptacle of the locking element particularly has an eccentric outer profile, particularly eccentric relative to the axis of rotation. The axis receptacle particularly has an outer profile that is at least approximately circular, the center of which is arranged offset relative to the axis of rotation. The outer profile of the axis receptacle preferably abuts at least partially against the handle base. The distance between the handle base and the head of the fastening element is preferably variable depending on the rotational position of the axis receptacle. This makes it possible to provide an advantageous locking mechanism in particular. In particular, a locking unit that is advantageously easy to operate can be provided. In particular, screws for adjustment can be omitted.

[0016] It is further proposed that the force-applying element is supported with a first end on the shaft column and with a second end on the handle base. The handle base preferably has a notch, in particular a cylindrical notch, through which the fastening element extends. A step is particularly formed in the notch, on which the force-applying element is supported with its second end. The notch particularly has two diameters, the step being formed by these two diameters. The force-applying element is preferably supported with its first end on the circumferential side of the shaft column. This makes it possible to provide an advantageous force-applying element, in particular a force-applying element that is advantageously easy to install and inexpensive.

[0017] It is further proposed that the force-applying element and the fastening element extend coaxially around the fastening element. The force-applying element particularly has a basic shape of a hollow cylinder, wherein the fastening element coaxially extends through the force-applying element. The force-applying element is preferably arranged around the shank of the fastening element, in particular between the head and the threaded section. It is further preferred that the force-applying element and the fastening element extend coaxially with the notch of the handle base. The fastening element particularly extends through the notch of the handle base. The force-applying element particularly extends from the side of the handle base facing away from the fastening base into the notch of the handle base. This makes it possible, in particular, to achieve an advantageous arrangement of the force-applying element. In particular, reliable guidance of the force-applying element can be achieved.

[0018] It is further proposed that the additional handle device has a fastening column, which is provided for connecting the fastening base to the handheld power tool, and the fastening column has at least one internal thread for directly connecting to the fastening element of the stop unit. The fastening column is preferably provided for connecting the fastening base to the handheld power tool via an attachment point for the additional handle. For this purpose, the fastening column particularly has a threaded section, which is provided for screwing into the internal thread of the handheld power tool. The fastening column preferably extends through a notch in the fastening base, at which the fastening base is fixed by the head of the fastening column. The internal thread is particularly arranged in the head of the fastening column. The internal thread particularly extends coaxially with the threaded section of the fastening column. This makes it possible to achieve an advantageous fastening of the additional handle device.

[0019] It is also proposed that the handle base be formed as a bow-shaped handle. However, other configurations of the handle base considered appropriate by those skilled in the art are also conceivable. The handle base is preferably fastened only on one side. The handle base comprises, in particular, a fastening arm on which the handle base can be connected to the fastening base; a handle crossbar connected to the fastening arm at least approximately perpendicularly thereto; and an arm extension connected to the handle crossbar at least approximately perpendicularly thereto. The arm extension extends parallel to the fastening arm, in particular, at the end of the handle crossbar facing away from the fastening arm. The fastening arm, handle crossbar, and arm extension in particular form a bow-shaped handle. It is also conceivable that the arm extension is also rotatably mounted on the handheld power tool. In this context, "at least approximately" should be understood to mean, in particular, that the deviation from a predetermined value is less than 25%, preferably less than 10%, and particularly preferably less than 5%. This provides a particularly reliable additional handle device. In particular, a handle base that is easy to grip can be provided. Furthermore, a secure grip can be achieved. Particularly when the handheld power tool is designed as a concrete grinder, a particularly secure grip can be achieved.

[0020] It is further proposed that the locking profile of the handle base body and the locking profile of the fastening base body each consist of a face toothing. The locking profiles are in particular formed by corresponding face toothings. The locking profiles can, for example, each consist of a Hirth face toothing. However, other face toothings that are considered appropriate by a person skilled in the art are also conceivable. The face toothings preferably each extend annularly around the fastening element. The face toothings are in particular arranged in a plane perpendicular to the fastening element. This makes it possible to achieve a particularly advantageous and reliable locking. In particular, rotation in the locked state can be reliably prevented.

[0021] It is also proposed that the locking element is configured to be released in order to adjust the rotational position of the handle base, and the handle base is configured to be moved axially away from the fastening base and rotated against the force of the force-applying element in order to adjust the rotational position. The locking unit, in particular the locking element of the locking unit, preferably has a closed position and an open position, wherein in the closed position, the two locking profiles are in a non-disengaging engagement with each other. The locking element is preferably released by pivoting and moved from the closed position to the open position. In addition, the locking element can be moved from the open position to the closed position, in particular by pivoting back. In the open position, the locking element is preferably pivoted away from the handle base and, in the closed position, is preferably pivoted toward the handle base. In the open position, the two locking profiles are preferably able to disengage from each other, in particular against the force of the force-applying element. In the closed position, the two locking profiles are particularly preferably unable to disengage from each other. The locking element is preferably formed by a locking lever, wherein the locking element is in a closed position or an open position depending on its pivoting position. This makes it possible to achieve particularly advantageously convenient operation. Furthermore, inadvertent adjustment of the handle base can be avoided, even when the locking unit is in the open state. To perform the adjustment, the handle base preferably has to be pulled axially outward, in particular against the force of the force-applying element.

[0022] Furthermore, the present invention is based on a handheld power tool system having a handheld power tool and an additional handle device connected to the handheld power tool.

[0023] The additional handle device of the present invention is not limited to the aforementioned applications and embodiments. In particular, to achieve the method of operation described herein, the additional handle device of the present invention may have a number of individual elements, components, and units that differs from the numbers mentioned here. Furthermore, within the value ranges given in this disclosure, values ​​within the stated limits are also to be considered disclosed and freely applicable.

[0024] Further advantages can be derived from the following description of the drawings. The drawings illustrate exemplary embodiments of the present invention. The drawings and the description contain a number of features that are combined together. A person skilled in the art can also reasonably consider these features individually and combine them into other meaningful combinations. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a handheld power tool system comprising a handheld power tool and an additional handle device according to the present invention connected to the handheld power tool is shown, the additional handle device having a handle base body and a fastening base body;

[0026] Figure 2 A schematic exploded view of an additional handle device according to the present invention is shown, which comprises a handle base body, a fastening base body and a locking unit;

[0027] Figure 3 A partial cross-sectional view of an additional handle device according to the present invention is shown, comprising a handle base, a fastening base and a locking unit in a closed position;

[0028] Figure 4 A partial sectional view of an additional handle device according to the invention is shown, comprising a handle base body, a fastening base body and a locking unit in an open position. DETAILED DESCRIPTION

[0029] Figure 1 The handheld power tool system is shown, which has a handheld power tool 12 and an additional handle device 10 connected to the handheld power tool 12. The handheld power tool 12 is composed of a concrete grinder. However, other configurations that are considered appropriate by a person skilled in the art are also conceivable, such as angle grinders. The handheld power tool 12 has a drive housing 42 and a drive unit 44 arranged in the drive housing 42. In addition, the handheld power tool 12 has a transmission housing 46 connected to the drive housing 42, a transmission 48 arranged in the transmission housing 46, and a tool interface 50 for attaching an application tool (tool) to the transmission 48. In addition, the handheld power tool 12 has a protective cover 52 arranged on the transmission housing 46. The drive housing 42 has a gripping area 54.

[0030] The transmission housing 46 has a recess 56 , in particular a threaded recess, for detachable connection to an additional handle, in particular the additional handle device 10 .

[0031] The additional handle device 10 has a fastening base 14, which is configured to be arranged directly on the handheld power tool 12. The fastening base 14 is configured to be removably arranged on the transmission housing 46. The fastening base 14 partially surrounds the transmission housing 46. The additional handle device 10 also has a fastening post 38, which is configured to connect the fastening base 14 to the handheld power tool 12. The fastening post 38 is configured to connect the fastening base 14 to the handheld power tool 12 via an attachment point for the additional handle. The fastening post 38 is configured to connect the fastening base 14 to the handheld power tool 12 via a slot 56 in the transmission housing 46. For this purpose, the fastening post 38 has a threaded section 58, which is configured to be screwed into the internal thread of the slot 56 in the transmission housing 46. The fastening post 38 extends through the slot in the fastening base 14. The fastening pin 38 has a head 60, by means of which the fastening base 14 is fixed to the transmission housing 46. The head 60 is arranged at the end of the fastening pin 38 facing away from the threaded section 58. The fastening pin 38 also has an internal thread 40. The internal thread 40 is arranged in the head 60 of the fastening pin 38. The internal thread 40 extends coaxially with the threaded section 58 of the fastening pin 38.

[0032] Furthermore, the additional handle device 10 includes a handle base 18 rotatably mounted relative to the fastening base 14 in at least one operating state, the handle base 18 having at least one gripping surface 20. The handle base 18 is formed as a bow-shaped handle. The handle base 18 is connected to the fastening base 14 on only one side. The handle base 18 comprises a fastening arm 64, on which the handle base 18 can be connected to the fastening base 14; a handle crossbar 66 connected to the fastening arm 64 at least approximately perpendicularly; and an arm continuation 68 connected to the handle crossbar 66 at approximately perpendicularly. The arm continuation 68 extends parallel to the fastening arm 64 at the end of the handle crossbar 66 facing away from the fastening arm 64. The fastening arm 64, the handle crossbar 66, and the arm continuation 68 form a bow-shaped handle. The fastening arm 64, the handle crossbar 66, and the arm continuation 68 transition into each other in a rounded manner. The handle base 18 is particularly C-shaped. The fastening arm 64 , the handle crossbar 66 and the arm continuation 68 each have a circular cross section. In addition, the outer surface of the handle crossbar 66 forms the grip surface 20 .

[0033] The handle base body 18 furthermore has a cylindrical fastening extension 70 adjoining the fastening arm 64 and projecting essentially perpendicularly therefrom in the direction of the fastening base body 14 .

[0034] The fastening base 14 has a stop profile 16. Furthermore, the handle base 18 has a stop profile 22 configured to correspond to the stop profile 16 of the fastening base 14. The stop profile 22 of the handle base 18 is arranged on the end face of the fastening extension 70. The stop profile 16 of the fastening base 14 is arranged on the side of the fastening base 14 facing away from the notch 56 of the transmission housing 46. The stop profile 22 of the handle base 18 and the stop profile 16 of the fastening base 14 are each formed by a face toothing. The stop profiles 16 and 22 are formed by corresponding face toothings. For example, the face toothings 16 and 22 can each be formed by a Hirth face toothing. However, other face toothings considered meaningful by those skilled in the art are also conceivable. The stop profiles 16 and 22 are each configured in an annular shape. When coupled to a corresponding locking contour 22 , the locking contour 16 is provided to form a positive connection with the corresponding locking contour 22 , in particular in the circumferential direction, and thereby prevent the handle base body 18 from rotating relative to the fastening base body 14 .

[0035] The additional handle device 10 also includes a locking unit 24. The locking unit 24 includes a locking element 26, which is provided for removably securing the handle base 18 against rotation relative to the fastening base 14. The locking element 26 is formed by a locking lever. The locking element 26 of the locking unit 24 has a closed position and an open position. In the closed position, the two locking contours 16, 22 are captively engaged with each other. Furthermore, in the open position, the two locking contours 16, 22 can be disengaged from each other. In the closed position, the locking element 26 abuts against the handle base 18. The locking element 26 includes an operating lever, which, in the closed position, abuts, in particular, flatly against the handle base 18. The handle base 18 particularly includes a recess, in which the locking element 26 is arranged in the closed position. The locking unit 24 also includes a fastening element 30, which is fixedly connected to the fastening base 14. The fastening element 30 is formed by a fastening screw. The fastening element 30 has a head 72 formed by a cylindrical screw head, a shank 74, and a threaded section 76. The fastening element 30 extends through the handle base 18. The handle base 18 has a cylindrical slot that extends through the fastening extension 70, through which the fastening element 30 extends. The fastening element 30 extends through the slot of the handle base 18. The internal thread 40 of the fastening column 38 is provided for direct connection with the fastening element 30 of the locking unit 24. The threaded section 76 of the fastening element 30 is screwed into the internal thread 40 in the installed state. The locking unit 24 also has a shaft column 32 directly connected to the fastening element 30 and provided for rotatable mounting of the locking element 26. The shaft column 32 has a central axis that extends perpendicular to the central axis of the fastening element 30. The shaft stub 32 has a radial bore through which the fastening element 30 extends when installed. The shaft stub 32 rests against the head 72 of the fastening element 30. The shaft stub 32 has a step in the radial bore against which the head 72 of the fastening element 30 rests. The shaft stub 32 is pressed against the head 72 of the fastening element 30 by the force-applying element 28 on the fastening element 30. The shaft stub 32 is provided for direct rotational support of the stop element 26. The stop element 26 has a shaft notch in which the shaft stub 32 is rotatably supported relative to the stop element 26. The stop element 26 is pivotally supported by the shaft stub 32.

[0036] The locking element 26 is mounted so as to be rotatable about an axis of rotation 34, wherein the locking element 26 has an eccentric profile 36 about the axis of rotation 34. The center axis of the shaft 32 forms the axis of rotation 34 for the locking element 26. The locking element 26 has a shaft receptacle that is arranged to surround the shaft 32. The shaft receptacle of the locking element 26 has an eccentric outer profile, in particular, an outer profile that is eccentric relative to the axis of rotation 34. The shaft receptacle has an at least approximately circular outer profile, the center of which is offset relative to the axis of rotation 34. The eccentric profile 36 of the shaft receptacle partially abuts against the handle base 18. The distance between the handle base 18 and the head 72 of the fastening element 30 can vary depending on the rotational position of the shaft receptacle.

[0037] The additional handle device 10 also includes a force-applying element 28. The force-applying element 28 is configured to apply a force from the handle base 18 toward the fastening base 14. The force-applying element 28 is formed by a spring element. The force-applying element 28 is formed by a compression spring. The force-applying element 28 is formed by a coil spring. The force-applying element 28 is configured to bring the retaining contour 22 of the handle base 18 into engagement or maintain engagement with the retaining contour 16 of the fastening base 14. The force-applying element 28 extends coaxially with the fastening element 30 and around the fastening element 30. The force-applying element 28 is supported at its first end on the shaft 32 and at its second end on the handle base 18. A step 78 is formed in the notch in the handle base 18 through which the fastening element 30 extends, and the force-applying element 28 is supported at its second end on this step. The notch has two diameters, which form the step 78. The force-applying element 28 is supported at its first end on the circumferential side of the shaft 32. The force-loading element 28 has a basic hollow cylindrical shape, wherein the fastening element 30 extends coaxially through the force-loading element 28. The force-loading element 28 is arranged around the shaft 74 of the fastening element 30. The force-loading element 28 and the fastening element 30 extend coaxially with respect to the recess of the handle base body 18. The force-loading element 28 extends from the side of the handle base body 18 facing away from the fastening base body 14 into the recess of the handle base body 18.

[0038] The locking element 26 is provided for being released in order to adjust the rotational position of the handle base 18, and the handle base 18 is provided for being moved and rotated axially away from the fastening base 14 against the force of the force-applying element 28 in order to adjust the rotational position. In the closed position, the two locking contours 16, 22 are non-detachably engaged with each other ( Figure 3 The locking element 26 is released by pivoting and moves from the closed position to the open position ( Figure 4). In addition, the locking element 26 can be moved from the open position to the closed position by pivoting back. In the open position, the locking element 26 is pivoted away from the handle base 18 and in the closed position, it is pivoted toward the handle base 18. In the open position, the two locking contours 16, 22 can be disengaged from each other against the force of the force-applying element 28. In the closed position, the two locking contours 16, 22 cannot be disengaged from each other.

Claims

1. An additional handle device for a handheld power tool (12), comprising: at least one fastening base body (14), which is provided for being arranged directly on the handheld power tool (12) and has at least one retaining contour (16); at least one handle base (18) which is mounted so as to be rotatable relative to the fastening base (14) in at least one operating state, the handle base having at least one gripping surface (20) and at least one retaining contour (22) configured to correspond to the retaining contour (16) of the fastening base (14); and at least one locking unit (24) having at least one locking element (26), in particular a locking lever, for releasably securing the handle base body (18) against rotation relative to the fastening base body (14); It is characterized by: At least one force-applying element (28) is provided, which is configured to apply a force to the handle base body (18) directed from the handle base body (18) in the direction of the fastening base body (14).

2. The additional handle device according to claim 1, characterized in that The force-loading element (28) is formed by a compression spring.

3. The additional handle device according to claim 1 or 2, characterized in that: The locking unit (24) comprises: at least one fastening element (30), in particular a fastening screw, which is fixedly connected to the fastening base (14); and at least one shaft column (32) directly connected to the fastening element (30), which is provided for rotatably supporting the locking element (26).

4. An additional handle device according to any one of the preceding claims, characterized in that The locking element (26) is mounted so as to be rotatable about an axis of rotation (34), wherein the locking element (26) has an eccentric contour (36) with respect to the axis of rotation (34).

5. Additional handle device according to at least claim 3, characterized in that The force-applying element (28) is supported with a first end on the shaft (32) and with a second end on the handle base (18).

6. Additional handle device according to at least claim 3, characterized in that The force-applying element (28) extends coaxially with the fastening element (30) and around the fastening element (30).

7. An additional handle device according to any one of the preceding claims, characterized in that A fastening column (38) is provided, which is provided for connecting a fastening base body (14) to a handheld power tool (12) and has at least one internal thread (40) for direct connection to a fastening element (30) of a locking unit (24).

8. An additional handle device according to any one of the preceding claims, characterized in that The handle base (18) is composed of an arc-shaped handle.

9. An additional handle device according to any one of the preceding claims, characterized in that The retaining contour (22) of the handle base body (18) and the retaining contour (16) of the fastening base body (14) are each formed by a face toothing.

10. An additional handle device according to any one of the preceding claims, characterized in that The locking element (26) is provided for being released for adjusting the rotational position of the handle base (18), and the handle base (18) is provided for being moved axially away from the fastening base (14) and rotated against the force of the force-applying element (28) for adjusting the rotational position.

11. A handheld power tool system comprising a handheld power tool (12) and an additional handle device (10) according to any one of the preceding claims, connected to the handheld power tool (12).

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