Hand rest adjustment device, driver's seat, and working machine

Abstract

This application relates to the field of work machinery and discloses a handrest adjustment device, a driver's seat, and work machinery. The handrest adjustment device includes a locking member, which has a locked state (locking the handrest's support height) and an unlocked state (releasing the handrest to allow adjustment of its support height); and an elastic reset member, which elastically acts on the locking member to keep the locking member in the locked state. The locking member is also configured to overcome the elastic force of the elastic reset member and move from the locked state to the unlocked state under external force. This device utilizes the elastic force of the elastic reset member to keep the locking member in the locked state. When the handrest needs adjustment, the locking member is pushed to the unlocked state to adjust the support height. The locking member automatically returns to the locked position under the elastic force of the elastic reset member, eliminating the need for manual locking after adjustment and effectively improving the ease of handrest adjustment.

Description

Technical Field

[0001] This application belongs to the field of operating machinery, specifically relating to a hand rest adjustment device. Based on this, the present invention also relates to a driver's seat and operating machinery including the hand rest adjustment device. Background Technology

[0002] The driver's seat of any machinery is typically equipped with a height-adjustable handrest. The driver can adjust the handrest height to support their arm and thus operate the hydraulic handles more stably. Most existing handrests are fixed to the armrest box using a knob. Adjusting the handrest height requires first loosening the knob, then the driver grasping the handrest, moving it to the desired height, and simultaneously tightening the knob to secure it. This process is cumbersome and inconvenient. Utility Model Content

[0003] The purpose of this application is to overcome the inconvenience of existing hand support position adjustment operations and to provide a hand support adjustment device for more convenient adjustment of the hand support support height.

[0004] To achieve the above objectives, this application provides a handrest adjustment device for adjusting the support height of a handrest installed on an armrest box. The handrest adjustment device further includes: a locking member having a locked state that locks the support height of the handrest and an unlocked state that releases the handrest to allow adjustment of the support height of the handrest; and an elastic reset member configured to elastically act on the locking member so that the locking member tends to remain in the locked state. The locking member is configured to be able to overcome the elastic force of the elastic reset member under the action of an external force and move from the locked state to the unlocked state.

[0005] In some embodiments, one of the handrest and armrest box is provided with a guide sleeve, and the other is provided with a guide plate that extends at least partially into the guide sleeve. The guide plate and the guide sleeve have a plurality of limiting structures arranged along the extension direction of the guide plate. A locking member is adjustablely installed to the other of the guide plate and the guide sleeve and can cooperate with the limiting structures to form a locked state that locks the support height of the handrest. When the locking member is adjusted to move from the locked state to the unlocked state under the action of an external force, the locking member disengages from the limiting structures to allow the support height of the handrest to be adjusted by changing the extension length of the guide plate in the guide sleeve.

[0006] In some embodiments, a guide plate is mounted on the armrest box and has a groove extending in its insertion direction. A limiting structure is provided with a plurality of limiting protrusions formed in the groove. A guide sleeve is formed on the handrest. A locking member is adjustablely mounted on the guide sleeve. An elastic reset member elastically acts on the locking member in a direction perpendicular to the insertion direction of the guide plate, so that the locking member tends to remain in a locked state that engages with one of the limiting protrusions, and can disengage from the limiting protrusion when the locking member is subjected to external force, so that the handrest can be adjusted to a support height where the locking member engages with the other limiting protrusions.

[0007] In some embodiments, the locking element includes a pin extending through a groove and a limiting ring fixed to the pin and capable of engaging a limiting protrusion, wherein the pin is movably mounted on the hand rest along its own axis to allow the locking element to move between a locked state and an unlocked state.

[0008] In some embodiments, one end of the pin extends axially out of the guide sleeve to receive external force, and the elastic reset element is a helical spring sleeved on the pin, with one end of the helical spring connected to the guide sleeve and the other end connected to the limiting ring.

[0009] In some embodiments, a button mounted on one end of a pin and partially extending out of a guide sleeve to receive external forces has a stop portion formed on it that can conform to the inner wall of the guide sleeve.

[0010] In some implementations, a limiting element is installed on the guide sleeve, and the other end of the pin engages with the limiting element to guide the pin to move axially between a locked state and an unlocked state.

[0011] In some embodiments, a roller is also included between the inner wall of the guide groove and the edge of the guide plate, and the edge of the guide plate is provided with a groove for placing the roller.

[0012] The second aspect of this application provides a driver's seat, on which the aforementioned handrest adjustment device is installed.

[0013] A third aspect of this application provides a work machine equipped with the aforementioned driver's seat.

[0014] Through the above technical solution, the hand support adjustment device of this application, under normal conditions, uses the elastic force of the elastic reset member to keep the locking member in the locked state. When the hand support needs to be adjusted, push the locking member to move it to the unlocked state, adjust the hand support to a suitable support height and release the locking member. The locking member automatically returns to the locked position under the elastic force of the elastic reset member. Compared with the existing method of fixing the hand support with a knob, there is no need to manually lock it after adjusting the position, which effectively improves the convenience of hand support adjustment.

[0015] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings: Figure 1 This is a disassembly diagram of the hand support adjustment device of this application; Figure 2 This is a partial disassembly diagram of the hand support adjustment device of this application; Figure 3 This is a schematic diagram of the hand support adjustment device of this application; Figure 4 This is a top view of the hand support adjustment device of this application; Figure 5 for Figure 4 The BB section sectional view shown; Figure 6 This is a partial cross-sectional schematic diagram of the hand support adjustment device of this application; Figure 7 This is a schematic diagram of the guide plate of this application; Figure 8 This is a bottom view of the hand support in this application.

[0017] Explanation of reference numerals in the attached figures 1. Armrest box; 101. Guide plate; 102. Slide groove; 103. Limiting protrusion; 104. Groove; 105. Fixing plate; 106. Second connecting bolt; 2. Hand support; 201. Guide sleeve; 202. Upper hand support; 203. Lower hand support; 204. First connecting bolt; 3. Locking component; 301. Pin; 302. Limiting ring; 4. Elastic reset component; 5. Button; 501. Stop part; 6. Limiting component; 601. Limiting groove; 602. Insertion component; 7. Roller. Detailed Implementation

[0018] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0019] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0020] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0021] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0022] like Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, this utility model provides a handrest adjustment device for adjusting the support height of a handrest 2 installed on an armrest box 1. The handrest adjustment device further includes: a locking member 3, which has a locked state for locking the support height of the handrest 2 and an unlocked state for releasing the handrest 2 to allow adjustment of the support height of the handrest 2; and an elastic reset member 4, which is configured to elastically act on the locking member 3 so that the locking member 3 tends to remain in the locked state. The locking member 3 is configured to be able to overcome the elastic force of the elastic reset member 4 under the action of external force and move from the locked state to the unlocked state.

[0023] Specifically, when no external force is applied to the locking member 3 of the handrest adjustment device, the locking member 3 remains in the locked state under the elastic force of the elastic reset member 4, and the handrest 2 is fixed relative to the armrest box 1 to support the operator's arm. When it is necessary to adjust the support height of the handrest 2, an external force is applied to the locking member 3 to overcome the elastic force of the elastic reset member 4 and move from the locked state to the unlocked state. At this time, the handrest 2 can move relative to the armrest box 1 to adjust the support height. After the operator adjusts the handrest 2 to the appropriate support height, the external force applied to the locking member 3 is released, and the locking member 3 moves back from the unlocked state to the locked state under the elastic force of the elastic reset member 4. At this time, the handrest 2 is fixed relative to the armrest box 1 at the appropriate support height to complete the adjustment. The aforementioned external force can be a conventional operation such as pushing, pulling, or rotating the locking member 3 directly or indirectly by the operator. Compared with the existing handrests installed by using a knob fixing method, there is no need to manually lock after adjusting the support height, which effectively improves the convenience of handrest adjustment.

[0024] like Figures 1 to 8 As shown, in some embodiments, one of the handrest 2 and the armrest box 1 is provided with a guide sleeve 201, and the other is provided with a guide plate 101 that extends at least partially into the guide sleeve 201. The guide plate 101 and the guide sleeve 201 have a plurality of limiting structures arranged along the extension direction of the guide plate 101. The locking member 3 is adjustablely installed to the other of the guide plate 101 and the guide sleeve 201 and can cooperate with the limiting structures to form a locked state that locks the support height of the handrest 2. When the locking member 3 is adjusted to move from the locked state to the unlocked state under the action of external force, the locking member 3 disengages from the limiting structure to allow the support height of the handrest 2 to be adjusted by changing the extension length of the guide plate 101 in the guide sleeve 201.

[0025] Specifically, the direction in which the guide plate 101 extends into the guide sleeve 201 is the adjustment direction for adjusting the support height of the handrest 2 relative to the armrest box 1. In some embodiments, the locking member 3 is adjustablely mounted on the guide sleeve 201, and the guide plate 101 has multiple limiting structures distributed along the extension direction. Before adjustment, the locking member 3 is subjected to the elastic force of the elastic reset member 4, forming a locking engagement with one of the limiting structures on the guide plate 101 to lock the relative movement of the guide plate 101 and the guide sleeve 201, thereby locking the handrest 2 onto the armrest box 1. When the support height needs to be adjusted, the operator drives the locking member 3 mounted on the guide sleeve 201 to the unlocked state to release the locking engagement between the locking member 3 and the limiting structure, thereby releasing the relative movement of the guide plate 101 and the guide sleeve 201, thus facilitating the operator to adjust the support height of the handrest 2. After adjustment, the operator releases the locking member 3. Under the elastic action of the elastic reset member 4, the locking member 3 re-establishes a locking engagement with the limiting structure closest to the current support height, restoring the locked state of the locking member 3, thereby completing the adjustment of the support height of the hand support 2. In other embodiments, the locking member 3 can also be installed on the guide plate 101, and multiple limiting structures can be formed on the guide sleeve 201 to facilitate locking engagement.

[0026] like Figure 1 , Figure 2 , Figures 6 to 8 As shown, in some embodiments, a guide plate 101 is mounted on the armrest box 1 and has a groove 102 extending in its insertion direction. The limiting structure is configured with a plurality of limiting protrusions 103 formed in the groove 102. A guide sleeve 201 is formed on the handrest 2. A locking member 3 is adjustablely mounted on the guide sleeve 201. An elastic reset member 4 elastically acts on the locking member 3 in a direction perpendicular to the insertion direction of the guide plate 101, so that the locking member 3 tends to remain in a locked state that engages with one of the limiting protrusions 103, and can disengage from the limiting protrusion 103 when the locking member 3 is subjected to external force, so that the handrest 2 can be adjusted to a support height where the locking member 3 engages with the other limiting protrusions 103.

[0027] Specifically, the locking member 3 is adjustablely mounted on the guide sleeve 201 in a direction perpendicular to the insertion direction of the guide plate 101. When in the locked state, the locking member 3 is embedded in one of the limiting protrusions 103 to form a locking engagement. When the support height needs to be adjusted, the operator can push the locking member 3 to disengage from the current limiting protrusion 103, thereby releasing the relative movement between the guide sleeve 201 and the guide plate 101. The support height of the hand support 2 is adjusted along the insertion direction of the guide plate 101. After the adjustment is completed, the locking member 3 is released. Under the elastic force of the elastic reset member 4, the locking member 3 moves and embeds in the limiting protrusion 103 on the slide groove 102 near the current support height to form a locking engagement, thereby completing the adjustment of the support height of the hand support 2. The locking element 3 is installed on the guide sleeve 201 that is fixed relative to the hand support 2. During the adjustment of the support height, the relative position of the locking element 3 and the hand support 2 remains fixed, which makes it convenient for the operator to operate with one hand. For example, the operator can hold the hand support 2 with one hand while driving the locking element 3 with their fingers, which further improves the ease of operation of the adjustment device.

[0028] like Figure 3 and Figure 5 As shown, the hand support 2 includes an upper hand support 202, a lower hand support 203, and a first connecting bolt 204 connecting the two. The guide sleeve 201 and the lower hand support 203 can be manufactured using an integral injection molding process. The handrail box 1 is provided with a fixing plate 105 for installing the guide plate 101. The two are connected by a second connecting bolt 106, which can effectively simplify the production and installation process of the device and the subsequent disassembly and maintenance operations.

[0029] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, in some embodiments, the locking member 3 includes a pin 301 extending through the groove 102 and a limiting ring 302 fixed to the pin 301 and capable of engaging with the limiting protrusion 103, wherein the pin 301 is movably mounted on the hand rest 2 along its own axis to allow the locking member 3 to move between a locked state and an unlocked state.

[0030] Specifically, such as Figure 7As shown, the limiting protrusion 103 is an enlarged annular protrusion formed on the slide groove 102, used to cooperate with the limiting ring 302 to form a lock. The pin 301 is mounted on the guide sleeve 201 in a direction perpendicular to the insertion direction, and its radial dimension is smaller than the minimum groove width of the slide groove 102, so as to facilitate movement within the slide groove 102 in the insertion direction in the unlocked state. In the locked state of the locking member 3, the limiting ring 302 is embedded in one of the limiting protrusions 103 on the slide groove 102, thereby locking the relative movement of the locking member 3 and the slide groove 102 in the insertion direction. When the support height needs to be adjusted, the operator pushes the pin 301 axially, causing the limiting ring 302 to disengage from the current limiting protrusion 103, releasing the relative movement of the locking member 3 and the slide groove 102 in the insertion direction, thereby adjusting the hand support 2. After adjustment, the pin 301 is released. Under the elastic force of the elastic reset member 4, the pin 301 moves in the opposite direction along the axial direction, causing the limiting ring 302 to embed into the limiting protrusion 103 near the current position, restoring the locking state of the locking member 3 and the slide groove 102 in the insertion direction, thus completing the support height adjustment. In other embodiments, the limiting ring 302 and the limiting protrusion 103 may also adopt other compatible shapes, which are not limited in this utility model.

[0031] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, in some embodiments, one end of the pin 301 extends out of the guide sleeve 201 along its axial direction to bear external force, and the elastic reset member 4 is a helical spring sleeved on the pin 301. One end of the helical spring is connected to the guide sleeve 201, and the other end is connected to the limiting ring 302.

[0032] Specifically, a helical spring, sleeved on the pin 301 and connected at both ends to the guide sleeve 201 and the limiting ring 302 respectively, applies an elastic force along the axial direction of the pin 301 to the locking member 3, causing it to tend to remain in the locked state. Figure 6 As shown, in the locked state of the locking member 3, the helical spring has a certain pre-compression amount, and the elastic force along the axial direction of the pin 301 acts on the limiting ring 302 to keep it in a fixed engagement with the current limiting protrusion 103. When the support height needs to be adjusted, the operator pushes the pin 301 to extend one end of the guide sleeve 201 to move it axially, and the limiting ring 302 disengages from the current limiting protrusion 103 to release the locked state. During this process, the helical spring is further compressed. After the adjustment is completed, the operator releases the pin 301, and under the elastic force of the helical steel spring, the pin 301 moves in the opposite direction axially to achieve a fixed engagement between the limiting ring 302 and the new limiting protrusion 103. In other embodiments, the helical spring can also have a certain pre-tension amount, and the helical spring can be further stretched during the process of driving the locking member 3 from the locked state to the unlocked state to achieve the reset action of the locking member 3 after the pin 301 is released.

[0033] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, in some embodiments, a button 5 is also included, which is mounted on one end of the pin 301 and extends partially out of the guide sleeve 201 to receive external forces. The button 5 has a stop portion 501 that can fit against the inner wall of the guide sleeve 201.

[0034] Specifically, such as Figure 3 As shown, to facilitate one-handed height adjustment of the hand support 2, button 5 is installed on the guide sleeve 201 at the front side of the hand support 2, so that the operator can hold the hand support 2 with one hand and press button 5 with their finger. Figure 6 As shown, a stop portion 501 is formed on the button 5, which can fit against the inner wall of the guide sleeve 201 at the opening. In the locked state of the locking member 3, under the elastic force of the elastic reset member 4, the stop portion 501 fits against the inner wall of the guide sleeve 201, causing part of the button 5 to extend out of the guide sleeve 201. Figure 3 As shown, when adjustment is required, the operator holds the upper hand support 202 with one hand and presses the button 5 with their finger to push the pin 301 to move axially, thereby releasing the locking state of the locking member 3 to adjust the support height. After the adjustment is completed, the finger is released, and the button 5 moves outward of the guide sleeve 201 under the elastic force of the elastic reset member 4, and is restricted by the stop part 501, returning to the position where it partially extends out of the guide sleeve 201, so as to facilitate the next adjustment.

[0035] like Figure 2 and Figure 6 As shown, in some embodiments, a limiting member 6 is installed on the guide sleeve 201, and the other end of the pin 301 cooperates with the limiting member 6 to guide the pin 301 to move along its axial direction between a locked state and an unlocked state.

[0036] Specifically, the limiting member 6 includes a limiting groove 601 for limiting the radial displacement of the pin 301 and an insert 602 for mounting on the guide sleeve 201. The guide sleeve 201 has an opening on the side opposite to the button 5 to accommodate the insert 602, allowing the limiting member 6 to be manufactured separately and then fixedly mounted on the guide sleeve 201 via the insert 602, facilitating later disassembly and maintenance. Figure 6 As shown, in the locked state of the locking member 3, the other end of the pin 301 extends into the limiting groove 601, and the bottom of the limiting groove 601 provides a travel distance for the pin 301 to move between the locked and unlocked states. During the process of the operator pressing button 5 and the coil spring driving the pin 301 to reset, this end of the pin 301 always slides within the limiting groove 601 to limit the direction of movement of the pin 301, thereby improving the stability of the device operation.

[0037] like Figure 2 , Figure 6 and Figure 7 As shown, in some embodiments, a roller 7 is further included between the inner wall of the guide sleeve 201 and the edge of the guide plate 101, and a groove 104 for placing the roller 7 is provided on the edge of the guide plate 101. Specifically, one side of the roller 7 abuts against the inner wall of the guide sleeve 201, and the other side fits against the inner wall of the groove 104, so as to reduce the resistance when the guide plate 101 moves relative to the guide sleeve 201 in the insertion direction, reduce the wear of the device during use, and facilitate the adjustment of the support height of the hand support 2.

[0038] This utility model also provides a driver's seat equipped with the aforementioned handrest adjustment device. After adjusting the support height of the handrest 2, the operator does not need to manually lock it, effectively improving the ease of handrest adjustment. In some embodiments, the operator can hold the upper handrest 202 with one hand and press the button 5 to complete the adjustment, further improving the convenience of height adjustment.

[0039] This utility model also provides a working machine, on which the above-mentioned driver's seat is installed.

[0040] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and all fall within the protection scope of the present invention.

Claims

1. A handrest adjustment device for adjusting the support height of a handrest (2) mounted on a handrest box (1), characterized in that, The hand support adjustment device also includes: The locking member (3) has a locked state that locks the support height of the hand support (2) and an unlocked state that releases the hand support (2) to allow adjustment of the support height of the hand support (2); The elastic reset member (4) is configured to elastically act on the locking member (3) so that the locking member (3) tends to remain in the locked state. The locking member (3) is configured to be able to overcome the elastic force of the elastic reset member (4) under the action of external force and move from the locked state to the unlocked state.

2. The hand support adjustment device according to claim 1, characterized in that, One of the handrest (2) and the armrest box (1) is provided with a guide sleeve (201), and the other is provided with a guide plate (101) that extends at least partially into the guide sleeve (201), wherein, One of the guide plate (101) and the guide sleeve (201) has a plurality of limiting structures arranged along the insertion direction of the guide plate (101). The locking member (3) is adjustablely installed to the other of the guide plate (101) and the guide sleeve (201) and can cooperate with the limiting structures to form the locked state that locks the support height of the hand rest (2). When the locking member (3) is adjusted to move from the locked state to the unlocked state under the action of external force, the locking member (3) disengages from the limiting structure, so as to allow the support height of the hand support (2) to be adjusted by changing the insertion length of the guide plate (101) in the guide sleeve (201).

3. The hand support adjustment device according to claim 2, characterized in that, The guide plate (101) is installed on the armrest box (1) and has a groove (102) extending in its insertion direction. The limiting structure is configured as a plurality of limiting protrusions (103) formed in the groove (102). The guide sleeve (201) is formed on the hand rest (2), and the locking member (3) is adjustablely mounted on the guide sleeve (201). The elastic reset member (4) elastically acts on the locking member (3) in a direction perpendicular to the direction of insertion of the guide plate (101), so that the locking member (3) tends to remain in a locked state that engages with one of the limiting protrusions (103), and can disengage from the limiting protrusion (103) when the locking member (3) is subjected to external force, so that the hand rest (2) can be adjusted to the support height where the locking member (3) engages with the other limiting protrusions (103).

4. The hand support adjustment device according to claim 3, characterized in that, The locking member (3) includes a pin (301) extending through the groove (102) and a limiting ring (302) fixed to the pin (301) and capable of engaging with the limiting protrusion (103), wherein the pin (301) is movably mounted on the hand rest (2) along its own axis to allow the locking member (3) to move between the locked state and the unlocked state.

5. The hand support adjustment device according to claim 4, characterized in that, One end of the pin (301) extends axially out of the guide sleeve (201) to receive external force. The elastic reset member (4) is a helical spring sleeved on the pin (301). One end of the helical spring is connected to the guide sleeve (201), and the other end is connected to the limiting ring (302).

6. The hand support adjustment device according to claim 5, characterized in that, It also includes a button (5) installed at one end of the pin (301) and partially extending out of the guide sleeve (201) to receive external forces, the button (5) having a stop (501) that can fit against the inner wall of the guide sleeve (201).

7. The hand support adjustment device according to claim 5, characterized in that, A limiting element (6) is installed on the guide sleeve (201), and the other end of the pin (301) cooperates with the limiting element (6) to guide the pin (301) to move along its axis between the locked state and the unlocked state.

8. The hand support adjustment device according to claim 2, characterized in that, It also includes a roller (7) disposed between the inner wall of the guide sleeve (201) and the edge of the guide plate (101), and the edge of the guide plate (101) is provided with a groove (104) for placing the roller (7).

9. A driver's seat, characterized in that, The driver's seat is equipped with a hand rest adjustment device as described in any one of claims 1-8.

10. A type of operating machinery, characterized in that, The operating machinery is equipped with the driver's seat as described in claim 9.

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