CN114078290A

CN114078290A - Surface treatment device with remote unlocking means for an accessory device

Info

Publication number: CN114078290A
Application number: CN202110917514.3A
Authority: CN
Inventors: U.瓦尔迪克; I.扎巴克
Original assignee: Vorwerk and Co Interholding GmbH
Current assignee: Vorwerk and Co Interholding GmbH
Priority date: 2020-08-12
Filing date: 2021-08-11
Publication date: 2022-02-22
Also published as: DE102020121196A1

Abstract

The invention relates to a surface treatment device (1) having a base device (3) with a device housing (2) and an accessory device (5) which is detachably connected to an interface (4) of the base device (3), wherein the base device (3) has a remote unlocking device (6) by means of which a user of the surface treatment device (1) can detach the accessory device (5) from the base device (3), wherein the remote unlocking device (6) has an operating element (7), an unlocking mechanism (8) and an interface element (9) for connection to an adapter element of the accessory device (5). In order to provide an ergonomic and intuitively operated remote unlocking device (6), it is provided that the actuating element (7) is an actuating ring which is rotatably mounted on a cylindrical housing partial region (16) of the device housing (2), wherein the actuating element (7) has, in particular, radially projecting actuating elements (17) for actuation by a hand of a user.

Description

Surface treatment device with remote unlocking means for an accessory device

Technical Field

The invention relates to a surface treatment device having a base device with a device housing and an accessory device which is detachably connected to an interface of the base device, wherein the base device has a remote unlocking device by means of which a user of the surface treatment device can detach the accessory device from the base device, wherein the remote unlocking device has an operating element, an unlocking mechanism and an interface element for connection to an adapter element of the accessory device.

Background

A wide variety of surface treatment devices are well known in the art, which can be used in connection with a wide variety of different accessory devices. The device housing of the base device has an interface on which a plurality of different accessory devices can be arranged as selected. The accessory device may be selected by the user based on the surface treatment job to be performed.

The surface treatment device may be a cleaning device, such as a suction and/or scrubbing device, but may also be a polishing device, a sanding device, a lawn mower, or other device.

In order to be able to comfortably release the accessory device from the base device without the user having to bend over, remote unlocking devices are known from the prior art. The remote unlocking device makes it possible to release the accessory device from the interface by means of an operating element which is arranged remote from the interface for the accessory device. In this way, it is possible to operate the operating element with low effort and with one hand, without the user having to actuate an accessory device which is arranged remote from the operating element. A surface treatment device with such a remote unlocking device is shown, for example, in utility model DE 29901595U 1. The remote unlocking device is operated by means of a key.

Disclosure of Invention

Although the above-described remote unlocking device has proven effective in the prior art, the object of the present invention is to provide an alternative remote unlocking device which is equipped in particular with an ergonomically controllable operating element.

In order to solve the above-mentioned problem, it is provided that the annular actuating element is an actuating ring which is rotatably supported in the region of the cylindrical housing part of the device housing. In this case, it is provided in particular that the actuating element has an actuating element projecting in the radial direction for actuation by a hand of a user.

According to the invention, the user can activate the remote control of the surface treatment device by means of a rotatably mounted operating ring which is arranged around a cylindrical housing part region of the device housing. In this case, the hand of the user preferably acts against an action element configured as a projection in order to effect a rotation of the operating element. In contrast to an actuating element, which is embodied, for example, as a push button, a rotatably mounted actuating element can be ergonomically actuated, in particular when a cylindrical partial region, which supports the actuating element, is located on an active region, which is usually provided on the surface treatment device for the hand of a user. Furthermore, the user can achieve a stepless and more appropriate release of the accessory device by the angle of rotation of the operating element. The operating element's operating element serves as an operating point for the user's thumb or finger, for example, for transmitting force to the remote unlocking device. Depending on the configuration of the unlocking mechanism of the remote unlocking device, it is possible to provide for operation either in only one rotational direction or in two opposite rotational directions. The possibility of operating the operating element in two opposite rotational directions can be advantageous if the user can use the surface treating appliance, for example, with different orientations of the hand relative to the appliance housing of the base appliance. This is advantageous in particular when the operating element is arranged, for example, on a pivotable handle of the surface treating appliance, which handle can be pivoted, for example, by 180 degrees relative to the appliance housing by the user for different purposes of use.

Furthermore, it is provided that the actuating element is supported on a housing partial region of the device housing, which is associated with a joint of a pivotable handle for the surface treatment device. According to this embodiment, the surface treatment device has a handle which can be pivoted relative to the device housing of the base device by means of a joint. In this way, the handle can be pivoted into different orientations relative to the base device, for example into a first position, in which the handle forms an extension of the device housing of the base device, and into a second position, in which the handle is pivoted as compactly as possible close to the base device, i.e. for example in a side view behind the outer contour of the base device, so that the handle extends substantially antiparallel relative to the longitudinal extension of the device housing. In the second position, the surface treatment device can preferably be used as a portable device which is not supported on the surface to be treated during the surface treatment or whose weight is almost completely taken up by the user during the surface treatment. In this orientation, the surface treatment device is furthermore of compact design, so that the user can, for example, carry out applications on surfaces other than floor surfaces, such as stair treads, shelves, skirting, window panes and other surfaces above the floor. Since the joint for the pivotable handle is preferably of cylindrical design per se, and the corresponding housing part region also has a cylindrical design, the actuating element configured as an actuating ring is particularly advantageously arranged around the joint. The housing part region of the device housing and the housing part region of the handle can in particular form mutually adapted elements of the joint, between which the actuating element is arranged coaxially. Since the user anyway uses the handle for guiding and/or carrying the surface treating device, the user can intuitively and ergonomically act on the operating element of the remote unlocking means, without the user's hand having to be released from the handle or having to change hands on the handle in order to reach the operating element.

In accordance with the invention, the operating element is supported in at least one axial direction with reference to the cylindrical housing partial region on an adjacent housing partial region of the base device by means of a spring element. This design provides for a play-free mounting of the operating element on the device housing or on the handle. For example, spring elements can be arranged on the actuating ring, which spring elements support the actuating ring on adjacent housing partial regions, for example spring legs, which act on partial regions of the device housing or the handle. Such a spring element can be formed either on only one end side of the actuating ring or on both sides of the actuating ring. One embodiment may provide that spring legs are arranged on the inner side of the actuating ring, which spring legs press the ring part away from the mating abutment on the device part region, and that on the opposite end side, outer hooks or other guide elements are arranged, which are pressed in the direction of the spring legs by the adjacent housing part region. The actuating element is thereby supported in the axial direction overall without play.

Furthermore, it can be provided that the device housing has a stop element assigned to the actuating element, which limits the actuating travel of the actuating element, in particular the rotational angle of the rotatably mounted actuating ring. For example, the region of the housing part adjacent to the actuating element can have a projection which acts as a mating stop and limits the path of movement of the actuating element. The mating stop can in particular engage in a circular ring-shaped track of the actuating element and act there against a stop element of the actuating element. Thereby limiting the rotation of the operating ring within a predetermined angular range.

Furthermore, it is provided that the unlocking mechanism of the remote unlocking device has a pivot axis which is arranged fixedly on the base device and on which the pivot element is pivotably supported by means of two pivot arms which are opposite to one another with reference to the pivot axis, wherein the first pivot arm is connected to the actuating lever which leads to the actuating element and the second pivot arm is connected to the interface lever which leads to the interface element, so that a pivoting movement of the pivot element about the pivot axis and thus a displacement of the interface element relative to the adapter element of the accessory device is achieved when the actuating element is actuated by a user. The force acting on the operating element is transmitted to the interface element by means of the pivoting element. In this case, when the first pivot arm connected to the actuating element is acted upon, for example, by a tensile force, in order to generate a pushing force on the interface lever connected to the second pivot arm, the interface lever then effects a displacement or actuation of the interface element, so that the accessory device is released from the base device. The pivot element, which is mounted so as to be pivotable on the pivot shaft, thus serves as a steering lever, on which an actuating lever is formed on one end and an interface lever is formed on the other end. By actuating the actuating element, i.e. by rotating the actuating ring, a tensile force is exerted on the actuating lever by the actuating lever, which tensile force is converted by the conversion in the pivot axis into a corresponding thrust force of the interface lever. The pushing force is then exerted on the interface element through the interface lever, thereby releasing the accessory device from the base device of the surface treating device. The transmission ratio of the operating force of the operating lever to the interface lever can be adjusted by changing the length ratio of the lever member. As an alternative to loading the operating lever with a tensile force by operating the operating element, the operating lever can also be loaded with a pushing force. Depending on the selected operating direction of the operating element, the reference to the direction of rotation of the operating ring is for example made by a counterclockwise rotation or a clockwise rotation.

According to the specification, the operating lever and the interface lever are configured as link-like elements with a main longitudinal extension. In this way, an elongate, as thin as possible rod, for example a connecting rod, extends from the pivot arm of the pivot element on the one hand to the operating element and on the other hand to the interface element. The link-like design of the lever makes it possible to place the lever in a particularly simple manner and at a relatively large distance inside the device housing of the surface treatment device. The lever is thereby arranged in a space-saving manner within the limited installation space of the device housing, even when the interface element and the operating element are spaced apart from one another at a considerable distance on the device housing.

Furthermore, it is provided that the actuating element is formed integrally with the actuating lever. The same preferably applies to the transition between the interface rod and the interface element. The assembly of a large number of small components of the remote unlocking device is omitted by this design. In particular, a plurality of components can be assembled into a unit by means of an injection molding method.

According to the invention, the pivot element is assigned a spring element, the restoring force of which forces the pivot element into the priority position. The spring element can be assigned to the first pivot arm, the second pivot arm or both pivot arms of the pivot element. The spring element presses the pivot element back into a starting position, which corresponds to a preferred position in which the operating element is in the inoperative position and the interface element fixedly holds, i.e. latches, the adapter element of the accessory device. The spring element can be designed as a leaf spring, a disk spring, a helical spring, etc.

Furthermore, it can be provided that the free end region of the second pivot arm is mounted in the manner of a ball joint in a mounting region of the interface lever, which is designed as a joint socket. According to this embodiment, the interface lever has a bearing point in its end region facing the pivot element, in which bearing point a partial region of the second pivot arm of the pivot element engages. For example, the cam or the spherically configured end region of the second pivot arm can engage in the spherically shaped recess of the interface lever. This results in a configuration in the manner of a spherical joint overall, wherein the pivoting movement of the joint is, however, preferably limited to a pivot plane. By means of this shape of the connection, tolerances of the two components with respect to one another, i.e. the second pivot arm of the pivot element and the interface lever, are achieved, and the subsequent assembly of the components of the remote unlocking device is simplified.

Finally, it is provided that the interface element has a hook which is mounted on the device housing so as to be rotatable about a pivot axis. In this case, the interface element can be assigned in particular a spring element, the restoring force of which forces the interface element into a priority position in which the interface element is brought into engagement with an adapter element of the accessory device. According to this embodiment, the interface element itself is also mounted on the device housing so as to be rotatable about the pivot axis, so that the sliding movement of the interface lever is diverted into a pulling movement acting on the interface element, which effects a release of the adapter element of the accessory device. The pivoting movement of the hook can be adjusted by changing the lever length in front of and behind the pivot axis of the interface element.

Drawings

The present invention is illustrated in detail below with reference to examples. In the drawings:

figure 1 shows a surface treatment apparatus according to the invention,

figure 2 shows in an exploded view a further rear sub-area of a surface treating appliance according to the invention with a handle and a first part of a remote unlocking means,

figure 3 shows in an exploded view a front part region of a surface treating appliance with a second part of a remote unlocking means,

fig. 4 shows a remote unlocking device in a perspective view;

figure 5 shows a side view of the remote unlocking means,

figure 6 shows a part-area of a surface treating appliance together with a remote unlocking means fitted in the surface treating appliance,

figure 7 shows a side view of the remote unlocking means in an initial position of non-operation,

fig. 8 shows the remote unlocking device according to fig. 7 in the operated position.

Detailed Description

Fig. 1 shows an exemplary surface treatment device 1, which is designed here, for example, as a handheld cleaning device, i.e., as a handheld vacuum cleaner. The surface treating device 1 has a base device 3 and an interface 4 for detachable connection with an accessory device 5. The accessory device 5 may be detachably connected with the base device 3 through an interface. The accessory device 5 may for example be a suction nozzle and/or a cleaning element, such as a rotating brush roller or the like. Furthermore, if the surface treatment device 1 is alternatively configured as a mower, a polishing device, a sanding device, or the like, the accessory device 5 is accordingly a mowing tool, a polishing tool, a sanding tool, or the like. The invention shown in the following figures is not affected by this. The operation of the surface treatment device 1 can be carried out both with the aid of the accessory device 5 and without the aid of the accessory device 5. For example, the surface treatment device 1 may be used in connection with an accessory device 5 for treating a floor surface, or may be used without an accessory device 5 connected thereto for treating a surface above the floor, for example for dust suction of shelves, cleaning of window panes, etc. The base device 3 has a device housing 2 and a handle 19 arranged thereon. The user can guide the surface treatment device 1 by means of the handle 19 during normal work runs, for example over a surface to be treated. Here, the user usually moves the surface treating device 1 alternately in a push-pull movement in opposite directions. A switching device 27 with a switching element, for example with an on and off switch for an electrical consumer of the surface treatment device 1, for example for an electric motor of a fan, cleaning element or the like, is arranged on the handle 19. Furthermore, the processing intensity for the surface treatment can be adjusted, for example, by means of the switching device 27. The surface treatment device 1 can be connected in the usual manner via a mains plug to a domestic power supply and/or has a battery for supplying the consumer.

The handle 19 is arranged on the device housing 2, for example, pivotably about the joint 18. The joint 18 serves for pivoting the handle 19 relative to the device housing 2, for example, into two defined end positions which lie opposite one another at a pivot angle of 180 °. In principle, more final positions can also be provided. Fig. 1 shows a first end position of the handle 19, in which it is pivoted out onto an extension of the longitudinal extension of the base device 3 of the surface treating device 1. A second end position can also be provided, in which the handle 19 is pivoted back onto the base device 3. The handle 19 in the pivoted-out position forms an extension of the base unit 3, so that the user does not have to bend down, for example, toward the floor surface to be treated. In contrast, the second end position of the handle 19 is then, for example, at a pivot angle of 180 ° from the first end position, so that the handle 19 is pivoted back onto the base device 3, i.e. the handle 19 is oriented antiparallel to the first illustrated position. In this position, the user can advantageously use the surface treating apparatus 1 for above-ground surface treatment, in which treatment of a compact surface treating apparatus 1 is advantageous, the centre of gravity of which is close to the user's hand.

Fig. 2 to 8 show another embodiment of the surface treatment apparatus 1 according to the invention. In order to enable the pivoting of the handle 19 in this case to a position opposite one another, for example 180 degrees, the joint 18 has two mutually movable housing part regions 16, wherein the first housing part region 16 is associated with the device housing 2 and the second housing part region 16 is associated with the handle 19. The handle 19 furthermore has two

handle members

25, 26, namely a lower handle member 25 and an upper handle member 26. The lower handle part 25 has the above-mentioned housing part region 16 (see for example fig. 2). The handle 19 can be pivoted in general relative to the device housing 2, i.e. with a longitudinal extension about an axis of rotation in the axial direction a.

Between the base device 3 and the adapted housing partial region 16 of the handle 19, an operating element 7 of the remote unlocking device 6 is arranged, which, when operated, effects a release of the accessory device 5 from the base device 3 of the surface treatment device 1. The actuating element 7 is of essentially annular design with radial projections serving as the actuating element 17. The annular actuating element 7 is arranged coaxially with respect to the adjacent housing partial regions 16 and is rotatably mounted about a common axis of rotation between these housing partial regions 16. The support can be realized, for example, by spring legs which are supported on at least one housing part region 16. The actuating element 7 is thereby advantageously pressed upward, for example, in the direction of the handle 19, while the housing partial region 16 of the handle 19 presses the actuating element 7 downward in a covering manner, so that a play-free support of the actuating element 7 is formed with reference to the axial direction a. Furthermore, the actuating element 7 preferably has (not shown here) a stop element, which limits the angle of rotation of the actuating element 7. The remote unlocking means 6 are composed, as shown in particular in fig. 2 to 5, of an operating element 7, an unlocking mechanism 8 and an interface element 9 for detachable connection with an adapter element of the accessory device 5. The unlocking mechanism 8 comprises those elements of the remote unlocking means 6 which transmit the movement of the operating element 7 to the interface element 9, thus causing the accessory device 5 to be released by the interface element 9 when the operating element 7 is rotated by the user. The unlocking mechanism 8 mainly has an operating lever 14, a pivoting member 11 and an interface lever 15. Starting from the actuating element 7, an actuating lever 14 is connected to the actuating element 7, said lever being connected to the first pivot arm 12 of the pivot element 11. The second pivot arm 13 of the pivot element 11 is connected oppositely to the interface lever 15. The interface rod 15 is then guided to the interface element 9 again. The pivot element 11 is pivotably supported on a pivot axis 10 which is formed or fixed on the device housing 2 of the base device 3. The

pivot arms

12, 13 are on mutually opposite circumferential sides of the pivot axis 10 of the pivot element 11. The operating element 7 and the operating lever 14 and the first pivot arm 12 are in this case constructed, for example, in one piece, wherein the operating lever 14 and/or the first pivot arm 12 can be made in part from a flexible material which allows a relative movability of the operating lever 14 relative to the first pivot arm 12. In particular, a hinge 28, in this case a film hinge, can also be provided in the transition region from the actuating lever 14 to the first pivot arm 12. The second pivot arm 13 of the pivot element 11 is supported with a cam-like end region 21 in a bearing region 22, here for example U-shaped, of the interface lever 15 and is supported by means of a spring element 20 relative to an adapted partial region of the device housing 2 in order to move the pivot element 11 as a whole back towards the preferred rotational position when the user no longer exerts a force on the operating element 7. The free support of the end region 21 of the second pivot arm 13 in the support region 22 of the interface lever 15 simplifies the subsequent assembly of the actuating lever 14 or the interface lever 15. Furthermore, tolerances of the operating lever 14, the pivoting element 11 and the interface lever 15 are also achieved, without limiting the functionality of the remote unlocking device 6. The interface element 9 is connected in one piece to the interface rod 15, for example. In the transition region between the interface rod 15 and the interface element 9, a hinge 29 is present, which here is likewise made of an elastic material. The interface element 9 is mounted on the device housing 2 so as to be rotatable about a pivot axis 23. The end region of the interface lever 15 carrying the interface element 9 is furthermore supported on the device housing 2 by a spring element 24, wherein the restoring force of the spring element 24 acts such that the interface element 9 is pushed back into the latching position.

Fig. 6 shows the remote unlocking means 6 in a state of being fitted in the surface treating apparatus 1. In the illustrated position of the handle 19 relative to the device housing 2 of the base device 3, a right-handed user acts on the actuating element 17, for example with the index finger or middle finger, in order to rotate the actuating element 7 clockwise relative to the adjacent housing partial region 16. Furthermore, the actuating element 7 can also have such an actuating element 17 on the opposite circumferential side in order to enable a thumb-operated or surface treatment device 1 which is also advantageously designed for left-handed users. A clockwise actuation of the actuating element 7 causes a pulling movement of the actuating lever 14, which is transmitted to the interface element 9 via the unlocking mechanism 8. The interface element 9 then releases the adapted partial region of the coupled accessory device 5. The interaction of the individual components of the unlocking mechanism 8 required for this purpose is explained in more detail below with reference to fig. 7 and 8 in particular. Fig. 7 shows the non-rotated initial position of the actuating element 7. Fig. 8 shows the situation in contrast when the operating element 7 has been rotated clockwise and the interface element 9 has thus been lifted.

The invention specifically works as follows: the user operates the operating element 7 clockwise and thereby effects a rotation of the pivoting element 11 about the pivot axis 10, i.e. in the counterclockwise direction, by means of the operating lever 14 and the hinge 28. Thereby simultaneously tensioning the spring element 20, the return force of which tries to pivot the pivoting element 11 back to the initial position. In the resulting rotation of the pivot element 11 about the pivot axis 10, the interface lever 15 is acted upon by a thrust force in the direction of the interface element 9, which interface element 9 is rotatably movably, but positionally fixedly supported on the pivot axis 23. By a displacement movement of the interface lever 15, a deformation of the hinge 29 and thus a counterclockwise rotation of the interface element 9 is initiated. As shown in fig. 8, the interface element 9 is thus turned upwards and separated with respect to the adapted partial area of the accessory device 5. The accessory device 5 is thereby released and can be detached from the interface 4 of the base device 3 of the surface treating device 1. At the same time as the interface element 9 is tilted, the spring element 24 is also tensioned, i.e. compressed, and the restoring force of the spring element again attempts to move the interface element 9 back into the latching position shown in fig. 7. As soon as the user has finished exerting force on the actuating element 7 and thus on the unlocking mechanism 8, the unlocking mechanism 8 is moved back into the preferred position shown in fig. 7 by the associated

spring elements

20, 24, irrespective of whether the accessory device 5 is present on the base device 3.

In the exemplary embodiment shown, the remote unlocking device 6 is designed such that the user exerts a pulling force on the operating lever 14 by means of the operating element 7. As an alternative, it is also obviously possible for the unlocking mechanism 8 to be designed such that the user exerts a pushing force on the operating lever 14 by means of the rotation of the operating element 7. Other embodiments are also conceivable, in which the user can optionally rotate the operating element 7 in the clockwise direction or also in the counterclockwise direction.

List of reference numerals

1 surface treatment apparatus

2 device housing

3 basic equipment

4 interface

5 Accessory device

6 remote unlocking device

7 operating element

8 unlocking mechanism

9 interface element

10 pivoting shaft

11 pivoting element

12 first pivoting arm

13 second pivoting arm

14 operating rod

15 interface rod

16 housing part region

17 acting element

18 joint

19 handle

20 spring element

21 end region

22 bearing region

23 pivoting axis

24 spring element

25 Upper handle part

26 lower handle member

27 switching device

28 hinge

29 hinge

a axial direction.

Claims

1. Surface treatment device (1) having a base device (3) with a device housing (2) and having an accessory device (5) detachably connected to an interface (4) of the base device (3), wherein the base device (3) has a remote unlocking device (6) by means of which a user of the surface treatment device (1) can effect a separation of the accessory device (5) from the base device (3), wherein the remote unlocking device (6) has an operating element (7), an unlocking mechanism (8) and an interface element (9) for connection to an adapter element of the accessory device (5), characterized in that the operating element (7) is an operating ring rotatably supported on a cylindrical housing partial region (16) of the device housing (2).

2. Surface treatment apparatus (1) according to claim 1, characterized in that the annular operating element (7) has an acting element (17) projecting radially for operation by means of a user's hand.

3. Surface treatment device (1) according to claim 1, characterized in that the operating element (7) is supported on a housing part region (16) of the device housing (2) which is assigned to a joint (18) of a pivotable handle (19) for the surface treatment device (1).

4. The surface treatment device (1) according to claim 1, characterized in that the operating element (7) is supported on the adjacent housing partial region (16) of the base device (3) by means of a spring element with reference to at least one axial direction (a) of the cylindrical housing partial region (16).

5. Surface treatment device (1) according to claim 1, characterized in that the device housing (2) has a stop element assigned to the operating element (7), which stop element limits the operating stroke of the operating element (7).

6. Surface treatment apparatus (1) according to claim 5, characterized in that the stop element limits the angle of rotation of the rotatably supported operating ring.

7. Surface treatment apparatus (1) according to claim 1, characterized in that the unlocking mechanism (8) has a pivot shaft (10) which is fixedly arranged on the base device (3) and on which a pivot element (11) is pivotably supported by means of two pivot arms (12, 13) which are mutually opposed with reference to the pivot shaft (10), wherein the first pivot arm (12) is connected to an operating lever (14) which is guided to the operating element (7) and the second pivot arm (13) is connected to an interface lever (15) which is guided to the interface element (9), so as to cause a pivoting movement of the pivoting element (11) about the pivot axis (10) when the operating element (7) is operated by a user, and thereby causing a movement of the interface element (9) relative to an adapter element of the accessory device (5).

8. Surface treatment apparatus (1) according to claim 7, characterized in that the operating rod (14) and the interface rod (15) are configured as link-like elements with a main longitudinal extension.

9. Surface treatment apparatus (1) according to claim 7, characterized in that the operating element (7) is constructed in one piece with the operating rod (14).

10. Surface treatment apparatus (1) according to claim 7, characterized in that the pivoting element (11) is provided with a spring element (20), the return force of which forces the pivoting element (11) into the preferential position.

11. The surface treatment apparatus (1) according to claim 7, characterized in that a free end region (21) of the second pivot arm (13) is supported in a spherical joint manner in a support region (22) of the interface lever (15) which is configured as a joint socket.

12. Surface treatment apparatus (1) according to claim 1, characterized in that the interface element (9) has a hook which is rotatably supported on the apparatus housing (2) about a pivot axis (23).

13. Surface treatment apparatus (1) according to claim 12, characterized in that the interface element (9) is provided with a spring element (24), the reset force of which forces the interface element (9) into a preferential position in which the interface element (9) is brought into engagement with an adapter element of the accessory apparatus (5).