Armrest and device for adjusting height of shelf

Abstract

Various embodiments relate to an apparatus for adjusting the height of a shelf, comprising: a hydraulic device configured to support the shelf and configured to move along an axis to adjust the height of the shelf; and the starter is connected to the hydraulic device and is configured to start based on first external force on the starter and control the hydraulic device to move along the axis so as to adjust the height of the shelf, or enable the hydraulic device to stop at the adjusted height.

Description

Technical Field

[0001] Various embodiments relate to an apparatus and armrest for adjusting the height of a resting portion, such as a shelf. Background Art

[0002] The following background discussion is intended only to assist in understanding the present disclosure and should be understood as not an acknowledgment or admission that any of the material referred to was published, known, or part of the common general knowledge of the skilled person in any jurisdiction as of the priority date of this disclosure.

[0003] Traditionally, armrests are used to support a user's arms, wrists, and / or hands while sitting in a seat (e.g., a chair). Such armrests can provide enhanced comfort by reducing the load on the user's back and the strain on the user's shoulders and / or neck while sitting in a chair. Conventional armrests are typically adjustable to accommodate users of varying heights and body proportions. For example, the height of the armrest can be adjusted based on user input.

[0004] However, conventional armrests can present some issues. For example, some conventional armrests offer stepless height adjustment, but this height adjustment is achieved by rotating the armrest relative to a pivot point. Therefore, rotating the armrest to adjust its height upward or downward can cause the armrest to move forward or backward unintentionally. This unintentional movement can cause discomfort to the user, requiring a second adjustment to correct the unintentional movement.

[0005] As another example, some other conventional handrails may utilize a sliding metal rail having multiple holes spaced linearly in a vertical direction. The handrail's height can be adjusted by attaching a corresponding latch to one of the holes. However, the handrail may experience play and looseness at the portion where the latch is attached to one of the holes, particularly when the handrail is pulled or pushed. Furthermore, the handrail may be limited in that the handrail's height can only be adjusted to a predetermined height.

[0006] Furthermore, these conventional armrests may not provide a measurement of the armrest's current height. Furthermore, the armrest height may differ between the left and right armrests, for example due to differences in component size. Furthermore, armrest height adjustment may be limited by low precision.

[0007] Therefore, there is a need for an improved apparatus and an improved armrest that seeks to address at least one of the above-mentioned problems. Utility Model Content

[0008] According to various embodiments, there is provided an apparatus for adjusting a height of a shelf, comprising: a hydraulic device configured to support the shelf, and configured to move along an axis to adjust the height of the shelf; and an actuator connected to the hydraulic device, and configured to activate and control the hydraulic device to move along the axis to adjust the height of the shelf based on a first external force on the actuator, or deactivate the hydraulic device to stop at the adjusted height.

[0009] According to various embodiments, there is provided an apparatus for indicating a height of a shelf supported by a first support device and a second support device, the apparatus comprising: a variable resistor comprising a track connected to the first support device and a slider connected to the second support device and movably disposed on the track; and a display electrically connected to the variable resistor, wherein a position of the slider on the track varies based on a movement of the first support device, the variable resistor is configured to detect a resistance based on the position of the slider on the track varying, and measure the height of the shelf based on the detection result, and the display is configured to display the measured height of the shelf.

[0010] According to various embodiments, there is provided a handrail, comprising: a shelf configured to rest an object thereon; and an apparatus for adjusting a height of the shelf, the apparatus comprising: a hydraulic device configured to support the shelf, and configured to move along an axis to adjust the height of the shelf; and an actuator connected to the hydraulic device, and configured to activate and control the hydraulic device to move along the axis to adjust the height of the shelf based on a first external force on the actuator, or deactivate the hydraulic device to stop at the adjusted height. BRIEF DESCRIPTION OF DRAWINGS

[0011] In the drawings, like reference numerals refer to like parts throughout the various views. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the present application. In the following description, various embodiments are described in connection with the following drawings, wherein:

[0012] Figure 1 Perspective views of an apparatus and a handrail according to various embodiments are shown.

[0013] Figures 2A to 2E Various perspective views of an apparatus according to various embodiments are shown.

[0014] Figure 3 Perspective views of an apparatus and a handrail according to various embodiments are shown.

[0015] Figure 4 Perspective views of an apparatus and a handrail according to various embodiments are shown.

[0016] Figure 5A perspective view of a device in accordance with various embodiments is shown. DETAILED DESCRIPTION

[0017] The following detailed description references the drawings, wherein like numerals indicate like elements, and wherein:

[0018] The disclosure illustratively described herein can suitably be practiced in the absence of any element or elements, limitation or limitations, not specifically disclosed herein. Thus, for example, the terms “comprising,” “including,” containing”, etc. shall be read expansively and without limitation. The terms “comprising,” “including,” containing”, and the like used herein include the aforementioned elements, but also components which are integral operating and which are not specifically mentioned. Additionally, the terms “a” and “an,” as used herein, mean “one or more” unless expressly specified otherwise. Furthermore, to the extent that the terms “includes,” “including,” or “has” or “having” are used in either the detailed description or the claims, such terms are intended to be inclusive in a manner similar to the term “comprising” as an open transition term without precluding any additional or other elements.

[0019] Features described with respect to one embodiment can be correspondingly applied to the same or similar features in other embodiments. Features described with respect to one embodiment can be correspondingly applied to other embodiments even if not explicitly described in those other embodiments. Furthermore, additions and / or combinations and / or options described with respect to features in one embodiment can be correspondingly applied to the same or similar features in other embodiments.

[0020] With respect to various embodiments, the articles “a,” “an,” and “the” include one or more features or elements. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items.

[0021] Although terms such as “first,” “second,” etc. can be used to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another and do not define an order and / or the importance of the elements. A first element could be termed a second element, and, similarly, a second element could be termed a first element without departing from the scope of the specification.

[0022] It should be understood that the terms "upper", "over", "top", "bottom", "lower", "side", "rear", "left", "right", "front", "lateral", "side", "upper", "lower", and the like used in the following description are for convenience and to aid understanding of relative positioning or direction and are not intended to limit the orientation of any device, structure, or any portion of any device or structure.

[0023] The term "coupled" (or "connected") herein can be understood as mechanically coupled, for example attached or fixed, or just in contact without any fixation, and it should be understood that a direct or indirect coupling (in other words: a coupling without direct contact) can be provided.

[0024] Furthermore, the singular terms "a", "an", and "the" include plural referents unless context clearly indicates otherwise. Similarly, the word "or" is intended to include "and" unless the context clearly indicates otherwise.

[0025] As described herein, the term "hydraulic device" refers broadly to any hydraulic device capable of moving a shelf using hydraulic principles or mechanisms. This can be or include, for example, a system with at least one fluid-based piston, such as a gas push piston. In some embodiments, there can be two pistons, which can be connected to each other by a fluid channel. The two pistons can be of the same size and thus configured to equally transmit power from one piston to the other. The pistons can be of different sizes and thus configured to convert displacement into force and vice versa. Alternatively or additionally, the hydraulic device includes a hydraulic pump and thus can be configured to transmit pressurized fluid to one or more pistons, thereby causing the one or more pistons to translate along an axis. In this way, the position of the shelf can be controlled.

[0026] In order for the utility to be readily understood and put into practical effect, various embodiments will now be described by way of example and not by way of limitation, and with reference to the accompanying drawings.

[0027] Figure 1 Perspective views of a device 100 and a handrail 200 are shown, in accordance with various embodiments. Figures 2A to 2E Various perspective views of a device for adjusting the height of a shelf, in accordance with various embodiments, are shown.

[0028] Reference is made to Figure 1 and Figures 2A to 2EA device 100 for adjusting the height of a resting portion (e.g., a shelf 210), also referred to as the height of a handrail 200, can be provided. In some embodiments, the device 100 can be used with the shelf 210 to rest an object on the shelf 210. In some embodiments, a handrail 200 including the device 100 for adjusting the height of the shelf 210 can be provided. In some embodiments, the handrail 200 can further include the shelf 210 supported by the device 100. In some embodiments, the handrail 200 can further include, but is not limited to, a body or housing (not shown) that encloses at least one of the device 100 and the shelf 210. In some embodiments, the object can include, but is not limited to, at least a portion of a user’s body and at least a portion of an item. For example, at least a portion of the body can include, but is not limited to, an arm, a wrist, a hand, a leg, and a foot. For example, the item can be any item that a user wishes to place on the shelf 210, such as a book, a cup, a tablet, or a laptop.

[0029] In some embodiments, the shelf 210 can be configured to rest an object thereon. In some embodiments, the shelf 210 can be disposed on the device 100, and the height of the shelf 210 can be adjusted by the device 100. In some embodiments, the shelf 210 can include a resting top portion 210A. The resting top portion 210A can be a replaceable top portion having a magnetic coupling means, i.e., a magnetic PU (polyurethane) top portion, to couple with a top shelf 210C. In some embodiments, the resting top portion 210A can include a cushioning portion, and the top shelf 210C can be magnetically coupled to the cushioning portion. It can be appreciated that the cushioning portion can be detachably attached to the top shelf 210C. In some embodiments, the top shelf 210C can be attached to a bottom shelf 210B of the device 100. In some embodiments, the cushioning pad can be coated with an antibacterial material or formed of an antibacterial fabric. In some embodiments, the top shelf 210C can be formed of a relatively rigid material that can withstand the weight of an object (e.g., a human arm) resting thereon and exerting pressure thereon.

[0030] In some embodiments, a piece of furniture (not shown) can be provided. In some embodiments, the piece of furniture can be a chair or a car seat. For example, the chair can include, but is not limited to, an office chair, a gaming chair, a dining chair, a bench, a wheelchair, a recliner, and a sofa. In some embodiments, the piece of furniture can include an armrest 200. In some embodiments, the piece of furniture can also include a second armrest (not shown) that includes a second shelf (not shown) and a second device (not shown) configured to support the second shelf. In some embodiments, the second device and the second shelf can have the same shape and configuration as the device 100 and the shelf 210, respectively. In some embodiments, the armrest 200 can be referred to as a left armrest, and the second armrest can be referred to as a right armrest, or vice versa. In some embodiments, the piece of furniture can also include, but is not limited to, a seat, a support component, and a backrest.

[0031] As shown in FIG. 1A, the device 100 can include a hydraulic apparatus 110 and an actuator 120. In some embodiments, the device 100 as shown in FIG. 1A can provide a digital measurement of the height of the shelf 210. For example, the device 100 as shown in FIG. 1A can be referred to as a “digital caliper concept.” Figure 1 As shown in FIG. 1B, the device 100 can include a hydraulic apparatus 110 and an actuator 120. In some embodiments, the device 100 as shown in FIG. 1B can provide a digital measurement of the height of the shelf 210. For example, the device 100 as shown in FIG. 1B can be referred to as a “digital caliper concept.” Figure 1 As shown in FIG. 1C, the device 100 can include a hydraulic apparatus 110 and an actuator 120. In some embodiments, the device 100 as shown in FIG. 1C can provide a digital measurement of the height of the shelf 210. For example, the device 100 as shown in FIG. 1C can be referred to as a “digital caliper concept.” Figure 1 As shown in FIG. 1D, the device 100 can include a hydraulic apparatus 110 and an actuator 120. In some embodiments, the device 100 as shown in FIG. 1D can provide a digital measurement of the height of the shelf 210. For example, the device 100 as shown in FIG. 1D can be referred to as a “digital caliper concept.”

[0032] In some embodiments, the hydraulic apparatus 110 can be disposed below the shelf 210. For example, the hydraulic apparatus 110 can be arranged below a bottom shelf 210B of the device 100. In some embodiments, the hydraulic apparatus 110 can be directly or indirectly connected to the bottom shelf 210B. For example, the hydraulic apparatus 110 can be attached to the bottom shelf 210B. In some embodiments, the hydraulic apparatus 110 can be configured to support the shelf 210. In some embodiments, the hydraulic apparatus 110 can extend in a longitudinal direction. In some embodiments, the hydraulic apparatus 110 can be configured to move along an axis to adjust the height of the shelf 210. In some embodiments, the axis can include an axis that is perpendicular (at a 90-degree angle) to a reference surface (e.g., a floor). For example, the hydraulic apparatus 110 can be configured to move upward or downward to adjust the height of the shelf 210. In some other embodiments, the axis can include any axis that is between 0 degrees and 90 degrees relative to the reference surface. In some embodiments, the floor can include, but is not limited to, an indoor floor, an outdoor floor, a vehicle floor, a ground, and a surface of any item, such as a table. In some embodiments, the floor can be any reference surface on which the piece of furniture (containing the device 100) is placed.

[0033] In some embodiments, the actuator 120 can be disposed below the shelf 210. For example, the actuator 120 can be disposed adjacent to the bottom shelf 210B. In some embodiments, the actuator 120 can be directly or indirectly connected to the hydraulic device 110. For example, the actuator 120 can be directly or indirectly connected to a piston (not shown) of the hydraulic device 110. The piston can be a gas push piston. For example, the actuator 120 can be directly or indirectly connected to a top end of the hydraulic device 110, which can be adjacent to the bottom shelf 210B. In some embodiments, the actuator 120 can be disposed on the outer tube 150. In some embodiments, the outer tube 150 can include a window 121 (hereinafter, referred to as a "first window") and the actuator 120 can be connected to the gas push piston of the hydraulic device 110 through the first window 121.

[0034] In some embodiments, the actuator 120 can be a trigger mechanism of the appliance 100. In some embodiments, the actuator 120 can be configured to actuate the hydraulic device 110 to move from a current height to adjust the height of the shelf 210. In some embodiments, the actuator 120 can be configured to be compressed (actuated) in response to an input of a user, for example, an external force (hereinafter, referred to as a "first external force") on the actuator 120. For example, when the actuator 120 is compressed, the actuator 120 can actuate the hydraulic device 110 to move from the current height. In some embodiments, the actuator 120 can be configured to deactivate the hydraulic device 110 (e.g., via a locking mechanism) based on the first external force on the actuator 120, thereby stopping at the current height. In some embodiments, for example, when the user releases the compression, the actuator 120 can be released from the compressed state and returned to an initial position. For example, when the actuator 120 is released from the compressed state, the actuator 120 can deactivate the hydraulic device 110, thereby stopping the movement of the hydraulic device 110. In some embodiments, the actuator 120 can include, but is not limited to, a trigger, a lever, and a handle. It can be appreciated that in some embodiments, any other type of actuator 120 can be used as long as the actuator can provide a necessary range of rotation angles in response to a user input.

[0035] In some embodiments, the actuator 120 can be a control mechanism of the apparatus 100, and can include a lever that can actuate the actuator 120 between a locked state and an unlocked state. In some embodiments, in the unlocked state, the actuator 120 can be configured to allow the hydraulic device 110 to push the shelf 210 to move along the axis with the hydraulic mechanism to adjust the height of the shelf 210. In some embodiments, the actuator 120 can be configured to control the moving direction and the moving amount of the hydraulic device 110 based on a first external force on the actuator 120 to adjust the height of the shelf 210 to a desired height. For example, the actuator 120 can be configured to allow the shelf 210 (or any component part 210B, 210C) to move in a first direction (e.g., upward) along the axis when the actuator 120 is actuated, such that the height of the shelf 210 is increased. As another example, the actuator 120 can be configured to allow a load applied on the shelf 210 to resist the force of the hydraulic device when the actuator 120 is actuated to the unlocked state, thereby causing the shelf 210 to move in a second direction (e.g., downward) along the axis opposite to the first direction, such that the height of the shelf 210 is decreased. In summary, the actuator 120 can switch between the unlocked state that allows the hydraulic mechanism to move the apparatus 100 in the first and second directions, and the locked state that holds the apparatus 100 at a certain height.

[0036] In some embodiments, the apparatus 100 can further include a height adjuster 130.

[0037] In some embodiments, the height adjuster 130 can be disposed below the shelf 210. In some embodiments, the height adjuster 130 can be directly or indirectly connected to the hydraulic device 110. For example, the height adjuster 130 can be connected to a fluid cylinder (not shown) of the hydraulic device 110 through the interconnecting part 222. For example, the height adjuster 130 can be connected to a bottom end of the hydraulic device 110 through the interconnecting part. In some embodiments, the height adjuster 130 can be connected to the connecting part 220 that is configured to connect the apparatus 100 to a furniture, such as a main body of a chair. In some embodiments, the height adjuster 130 can be connected to the connecting part 220 through the interconnecting part 222.

[0038] In some embodiments, the height adjuster 130 can be configured to displace the hydraulic device 110 along the axis to adjust the height of the shelf 210 based on a user’s input, e.g., an external force on the height adjuster 130 (hereinafter referred to as “second external force”). In some embodiments, the height adjuster 130 can be configured to control the direction and amount of movement of the hydraulic device 110 to adjust the height of the shelf 210 to a desired height based on the second external force on the height adjuster 130. In some embodiments, the height adjuster 130 can displace the apparatus 100 along the axis using a height adjustment mechanism other than a hydraulic mechanism, in addition to the height adjuster 130, the bottom mounting plate 210B, and the inner tube 140. In some embodiments, the height adjuster 130 can adjust the height of the shelf 210 with higher precision (compared to the actuator 120). In some embodiments, the height adjuster 130 can require a specific thread size to ensure precise movement of the hydraulic device 110 while still preventing the handrail 200 from sliding.

[0039] In some embodiments, the height adjuster 130 can include, but is not limited to, a knob (e.g., a fine adjustment knob), a dial, a lever, and a handle. It can be appreciated that any other type of height adjuster 130 can be used in some embodiments, as long as the height adjuster 130 can provide the necessary range of rotational angles in response to a user’s input. In some embodiments, the knob can include, but is not limited to, an adjustable knob, a knob housing, and a lead screw 224. In some embodiments, the lead screw 224 can be welded with the interconnecting member 222 such that the interconnecting member 222 and the lead screw 224 can be displaced along a single axis when the height adjuster 130 is rotated. For example, a user can rotate an adjustable knob housed by the knob housing, and the lead screw connected to the adjustable knob can allow the hydraulic device 110 to move along the axis, e.g., upward or downward. In some embodiments, the height adjuster 130 can be configured to displace the hydraulic device 110 along the axis toward a first direction (e.g., upward) when the height adjuster 130 (e.g., the knob) is rotated in a third direction, such that the height of the shelf 210 is increased. In some embodiments, the height adjuster 130 can be configured to displace the hydraulic device 110 along the axis toward a second direction (e.g., downward) when the height adjuster 130 (e.g., the knob) is rotated in a fourth direction opposite to the third direction, such that the height of the shelf 210 is increased.

[0040] In some other embodiments, the actuator 120 and the height adjuster 130 can not be linked, and the actuator 120 can not control the height adjuster 130, but can control the activation of the hydraulic device 110. In some embodiments, the hydraulic device 110 can further include a lock (not shown) (hereinafter referred to as “the first lock”) configured to lock the hydraulic device 110, e.g., the air push piston, when the actuator 120 deactivates the hydraulic device 110. For example, when the actuator 120 deactivates the hydraulic device 110, the actuator 120 can control the first lock to immobilize the hydraulic device 110, e.g., the air push piston, so that, for example, the hydraulic device 110 does not move regardless of whether the height adjuster 130, e.g., the knob, is controlled by a second external force.

[0041] In some embodiments, the hydraulic device 110 can include a fluid cylinder. In some embodiments, the fluid cylinder can be filled with compressed gas, so the fluid cylinder can be an air cylinder. In some embodiments, the hydraulic device 110 can further include an air push piston. In some embodiments, the air push piston can be configured to move in the fluid cylinder along an axis, e.g., upward or downward, based on the control of the actuator 120. In some embodiments, the fluid cylinder can extend along a longitudinal direction. In some embodiments, the height adjuster 130 can be connected to the fluid cylinder through an interconnecting component. In some embodiments, a bottom end of the fluid cylinder can be disposed adjacent to the connecting component 220. For example, the bottom end of the fluid cylinder can be connected to the connecting component 220 through the interconnecting component. In some embodiments, the connecting component 220 can be sandwiched between the height adjuster 130 and the interconnecting component. In some embodiments, the air push piston can extend along the longitudinal direction. In some embodiments, a top end of the air push piston can be located below the bottom surface of the shelf 210. For example, the top end of the air push piston can be attached to the bottom shelf 210B.

[0042] In some embodiments, the actuator 120 can control the direction of the motion of the hydraulic device 110 (e.g., a gas push piston). In some embodiments, when the hydraulic device 110 is activated, the actuator 120 can allow the gas push piston to move along the axis towards a first direction (e.g., upwards) such that gas is released to generate an upward force when the user controls the actuator 120 to increase the height of the shelf 210. As the gas push piston moves upwards, the shelf 210 can move upwards, thus the height of the shelf 210 can increase. In some embodiments, when the hydraulic device 110 is activated such that the actuator 120 is controlled by the user to decrease the height of the shelf 210, the actuator 120 can trigger the gas push piston to open one or more valves to allow gas to move freely around the gas push piston, such gas movement enables movement along the axis towards a second direction (e.g., downwards). As the gas push piston moves downwards, the shelf 210 can move downwards, thus the height of the shelf 210 can decrease. In some embodiments, in this way, the height of the shelf 210 can be adjusted within the range of the gas push stroke (not shown) of the hydraulic device 110. In some embodiments, the gas push piston can require a fixed length to achieve a lower force required for actuation. In some embodiments, the force range of the gas push piston can be between 1 N and 40 N. In some embodiments, the outer diameter dimension of the gas push piston can range between 10 mm and 30 mm.

[0043] In some embodiments, the actuator 120 can control the amount of movement of the hydraulic device 110 (e.g., a gas push piston). In some embodiments, the amount of movement of the hydraulic device 110 can depend on the time and / or intensity of the first external force on the actuator 120. For example, the amount of gas released or trapped can depend on the time and / or intensity of the first external force acting on the actuator 120.

[0044] In some embodiments, the apparatus 100 can further include, but is not limited to, an inner tube 140 and an outer tube 150. In some embodiments, the outer tube 150 can be configured to support the shelf 210.

[0045] In some embodiments, inner tube 140 can extend along a longitudinal direction. In some embodiments, inner tube 140 can be disposed below shelf 210. In some embodiments, inner tube 140 can be disposed adjacent to hydraulic device 110. For example, a side of inner tube 140 can be attached to a plate (e.g., an aluminum plate) that can be attached to a side of hydraulic device 110 (e.g., a fluid cylinder). In some embodiments, a bottom end of inner tube 140 can be disposed adjacent to connecting member 220. For example, a bottom end of inner tube 140 can be attached to connecting member 220 via an interconnecting member. In some embodiments, inner tube 140 can not move along an axis (e.g., upward or downward) regardless of whether hydraulic device 110 moves along the axis (e.g., upward or downward). It can be appreciated that the plate to which inner tube 140 can be attached can be formed of various suitable metals or metal alloys.

[0046] In some embodiments, outer tube 150 can extend along a longitudinal direction. In some embodiments, a top end of outer tube 150 can be disposed below a bottom surface of shelf 210. For example, a top end of outer tube 150 can be attached to bottom shelf 210B. In some embodiments, outer tube 150 can enclose at least a portion of hydraulic device 110 and at least a portion of inner tube 140. In some embodiments, outer tube 150 can enclose at least a portion of a side of hydraulic device 110 and at least a portion of a side of inner tube 140. In some embodiments, outer tube 150 can be configured to move along an axis (e.g., upward or downward) in accordance with movement of hydraulic device 110.

[0047] In some embodiments, apparatus 100 can further include indicator 170.

[0048] In some embodiments, the "vernier caliper concept" as previously described can include indicator 170 configured to indicate a height of shelf 210, such as a previous height, a current height, and / or an adjusted height. In some embodiments, indicator 170 can be further configured to measure a height of shelf 210 to indicate a height of shelf 210. In some embodiments, indicator 170 can indicate a measured height of shelf 210.

[0049] As Figure 1 shown, in some embodiments, indicator 170 can include, but is not limited to, linear track 171, sensor 172 (also referred to as "sensor chip"), and display 173.

[0050] In some embodiments, linear track 171 can be directly or indirectly connected to inner tube 140. In some embodiments, linear track 171 can be attached to inner tube 140. For example, a side of linear track 171 can be attached to a side of inner tube 140. In some embodiments, linear track 170 can be formed along inner tube 140.

[0051] In some embodiments, the sensor 172 can be disposed on the outer tube 150. In some embodiments, the sensor 172 can be disposed adjacent to the bottom end of the outer tube 150. In some embodiments, the sensor 172 can be disposed such that the sensor 172 can detect the linear track 171.

[0052] In some embodiments, the sensor 172 can be configured to detect the linear track 171. In some embodiments, the sensor 172 can include a capacitive linear encoder device. In some embodiments, the sensor 172 can be configured to detect a position of the linear track 171 relative to the sensor 172. For example, as the height of the shelf 210 increases, the outer tube 150 can move along an axis, e.g., upwards, while the inner tube 140 can not move. The sensor 172 disposed on the outer tube 150 can detect a change in position of the linear track 171 attached to the inner tube 140. In some embodiments, the sensor 172 can include, but is not limited to, an infrared (IR) sensor, a radio frequency identification (RFID), near field communication (NFC), and an image sensor. In some embodiments, the linear track 171 can include at least one element such that the sensor 172 can detect a changing position of the linear track 171 relative to the sensor 172. For example, the linear track 172 can include a plurality of RFID chips spaced apart in a vertical direction, and the sensor 172 can detect one of the plurality of RFID chips on the linear track 172. In some embodiments, the sensor 172 can measure the height of the shelf 210 based on the detection by the sensor 172. For example, the sensor 172 can measure the height of the shelf 210 based on the detected one of the plurality of RFID chips.

[0053] In some embodiments, the display 173 can be disposed on the outer tube 150. In some embodiments, the display 173 can be disposed adjacent to the top end of the outer tube 150. In some embodiments, the display 173 can be configured to display the height of the shelf 210 measured by the sensor 172.

[0054] In some embodiments, the device 100 can further include a zero function button 160. In some embodiments, the zero function button 160 can be disposed below the shelf 210. For example, the zero function button 160 can be disposed adjacent to the bottom shelf 210B. In some embodiments, the zero function button 160 can be directly or indirectly connected to the hydraulic device 110. For example, the zero function button 160 can be directly or indirectly connected to the air push piston of the hydraulic device 110. For example, the zero function button 160 can be directly or indirectly connected to the top end of the hydraulic device 110 adjacent to the bottom shelf 210B. In some embodiments, the zero function button 160 can be disposed on the outer tube 150. In some embodiments, the outer tube 150 can include a window 122 (hereinafter referred to as “second window”) and the zero function button 160 can be accessed through the second window 122. For example, a user can access the zero function button 160 through the second window 122 to control, for example, the switching of the zero function button 160.

[0055] In some embodiments, the zero function button 160 can include a tactile button (not shown) and a main circuit board (not shown). In some other embodiments, the zero function button 160 can not include its own main circuit board and can use the main circuit board 174. In some embodiments, the zero function button 160 can be configured to calibrate the shelf 210 to the same height as any reference point (e.g., the bottom of a table).

[0056] In some embodiments, the indicator 170 can further include a main circuit board 174. In some embodiments, the main circuit board 174 can serve as a data hub for the measurement data of the height of the shelf 210. In some embodiments, the main circuit board 174 can house a plurality of electrical elements. In some embodiments, the main circuit board 174 can be a printed circuit board (PCB) configured to interconnect the plurality of electrical elements. In some embodiments, the plurality of electrical elements can include, but are not limited to, a battery 175, a light source 176, and a sensor 172. In some embodiments, the plurality of electrical elements can further include a processor (not shown) configured to control at least one of the light source 176, the sensor 172, and the display 173. In some embodiments, the processor can be a microcontroller unit (MCU) 174A. The MCU 174A can be configured to detect a resistance value and then convert the resistance value to a value to be displayed on the display 173.

[0057] In some embodiments, the light source 176 may be disposed on the main circuit board 174. In some embodiments, the light source 176 may be directly or indirectly connected to the display 173. In some embodiments, the light source 176 may be a light emitting diode (LED). In some embodiments, the light source 176 may be configured to emit light. In some embodiments, the light source 176 may be capable of generating light colors. In some embodiments, the light source 176 may be configured to emit light based on whether the display 173 is turned on or off. For example, the processor may control the light source 176 to emit light in a predetermined light color when the display 173 is turned on, and not to emit light when the display 173 is turned off. In some embodiments, the light source 176 may be capable of selectively generating a plurality of light colors. For another example, the processor may control the light source 176 to emit a predetermined first light color, such as green, when the display 173 is turned on, and not to emit a predetermined second light color, such as yellow, when the display 173 is turned off. In some embodiments, when the battery 175 is low on power, the processor may control the light source 176 to emit a predetermined third light color, such as red.

[0058] In some embodiments, the battery 175 can power at least one of the light source 176, the sensor 172, and the display 173. In some embodiments, the battery 175 can be a rechargeable battery or a replaceable non-rechargeable battery. For example, the battery 175 can be a button battery, but is not limited thereto.

[0059] In some embodiments, as Figures 2A to 2E The device 100 shown can provide a digital measurement of the height of the shelf 210. For example, Figures 2A to 2E The device 100 shown may include a variable resistor. In some embodiments, the variable resistor may include a linear potentiometer, and the acquisition of the digital measurement may be referred to as a "linear potentiometer concept."

[0060] In some embodiments, although not shown, the device 100 may include a Figure 1 The hydraulic device 110, the starter 120, and the height adjuster 130. In some embodiments, the device 100 may further include an indicator 170, such as Figures 2A to 2E In some embodiments, although not shown, an armrest 200 may be provided, which may include but is not limited to reference Figure 1 The apparatus 100 and shelf 210 are shown. In some embodiments, although not shown, furniture, such as a chair, may be provided that may include armrests 200.

[0061] In some embodiments, the device 100 may further include Figure 1 The inner tube 140 and the outer tube 150. In some embodiments, the device 100 may further include Figure 1 The zero position function button 160.

[0062] like Figures 2A to 2E As shown, the indicator 170 can be configured to indicate the height of the shelf 210, for example, the current height and the adjusted height. In some embodiments, the indicator 170 can also be configured to measure the height of the shelf 210 to indicate the height of the shelf 210. In some embodiments, the indicator 170 can indicate the measured height of the shelf 210.

[0063] like Figures 2A to 2E As shown, in some embodiments, the indicator 170 may include, but is not limited to, a linear potentiometer 177 and a display 173 .

[0064] In some embodiments, the linear potentiometer 177 can be directly or indirectly connected to the outer tube 150. In some embodiments, the linear potentiometer 177 can be attached to the outer tube 150. For example, the side of the linear potentiometer 177 can be attached to the side of the outer tube 150. In some embodiments, the linear potentiometer 177 can be formed along the outer tube 150. In some embodiments, the linear potentiometer 177 can extend in the longitudinal direction. In some embodiments, the linear potentiometer 177 can be disposed below the bottom shelf 210B of the device 100. The linear potentiometer 177 can be controlled by a microcontroller.

[0065] In some embodiments, the linear potentiometer 177 may include a track 177a and a slider 177b. In some embodiments, the track 177a may extend in a longitudinal direction. In some embodiments, the track 177a may be in the form of an elongated groove and provide a path for the slider 177b. In some embodiments, the track 177a may be directly or indirectly connected to the outer tube 150. In some embodiments, the track 177a may move along an axis (e.g., upward or downward) in accordance with the movement of the hydraulic device 110 and the outer tube 150.

[0066] In some embodiments, the slider 177b can be directly or indirectly connected to the inner tube 140. In some embodiments, the slider 177b can be attached to the inner tube 140. For example, the side of the slider 177b can be attached to the side of the inner tube 140. In some embodiments, the slider 177b can be movably disposed on the track 177a of the linear potentiometer 177. In some embodiments, the position of the slider 177b on the track 177a can change according to the movement of the outer tube 150 because the inner tube 140 does not move regardless of the movement of the hydraulic device 110 and the outer tube 150.

[0067] In some embodiments, the linear potentiometer 177 can be configured to detect a position of a slider 177b located on a track 177a of the linear potentiometer 177. For example, when the height of the shelf 210 is increased, the outer tube 150 can move in a first direction (e.g., upward), while the inner tube 140 can not move. The linear potentiometer 177 located on the outer tube 150 can detect a change in the position of the slider 177b on the track 177a of the linear potentiometer 177. In some embodiments, the linear potentiometer 177 can detect a resistance, which can depend on the position of the slider 177b. In some embodiments, the linear potentiometer 177 can measure the height of the shelf 210 based on the detected resistance.

[0068] In some embodiments, the display 173 can be disposed on the outer tube 150. In some embodiments, the display 173 can be disposed adjacent to a top end of the outer tube 150. In some embodiments, the display 173 can be configured to display the height of the shelf 210 measured by the linear potentiometer 177.

[0069] In some embodiments, the indicator 170 can further include, but is not limited to, a main circuit board 174 housing a plurality of electrical elements as described with reference to Figure 1 In some embodiments, the plurality of electrical elements can include, but is not limited to, a battery 175 as described with reference to Figure 1 a light source 176 as described with reference to Figure 1 and the linear potentiometer 177 described above. Although not shown, the plurality of electrical elements can further include a processor configured to control at least one of the light source 176 as described with reference to Figure 1 the display 173 described above, and the linear potentiometer 177 described above.

[0070] In some other embodiments, a device 100 for indicating a height of a shelf 210 supported by a first device (also referred to as an "outer tube") 150 and a second support device (also referred to as an "inner tube") 140 can be provided. The device 100 can include a linear potentiometer 177 including a track 177a connected with the first support device 150, a slider 177b connected with the second support device 140 and movably disposed on the track 177a. The device 100 can further include a display 173 electrically connected with the linear potentiometer 177. A position of the slider 177b on the track 177a can change according to a movement of the first support device 150. The linear potentiometer 177 can be configured to detect a resistance depending on the change in the position of the slider 177b on the track 177a and measure the height of the shelf 210 based on the detection result, and the display 173 can be configured to display the measured height of the shelf 210.

[0071] Figure 31 shows a perspective view of the device 100 and the handrail 200 according to various embodiments. In some embodiments, as Figure 3 The device 100 shown can provide a mechanical measurement of the height of the shelf 210. For example, Figure 3 The apparatus 100 shown may be referred to as a "rack and pinion concept."

[0072] Although not shown, the apparatus 100 may include a hydraulic device 110, a starter 120, a height adjuster 130, and a hydraulic pressure regulating device 110. Figure 1 In some embodiments, the device 100 may further include an indicator 170, such as Figure 3 In some embodiments, an armrest 200 may be provided, which may include but is not limited to reference Figure 1 The apparatus 100 and shelf 210 are shown. In some embodiments, although not shown, furniture, such as a chair, may be provided that may include armrests 200.

[0073] In some embodiments, the apparatus 100 may further include an inner tube 140 and an outer tube 150, as shown in FIG. Figure 1 In some embodiments, the device 100 can provide a zeroing function to calibrate the shelf 210 to the same height as any reference point (eg, the bottom of a table).

[0074] like Figure 3 As shown, the indicator 170 can be configured to indicate the height of the shelf 210, for example, the current height and the adjusted height. In some embodiments, the indicator 170 may include, but is not limited to, a linear rack 178 and a pinion 179.

[0075] In some embodiments, the linear rack 178 can be directly or indirectly connected to the inner tube 140. In some embodiments, the linear rack 178 can be attached to the inner tube 140. For example, the sides of the linear rack 178 can be attached to the sides of the inner tube 140. In some embodiments, the linear rack 178 can be formed along the inner tube 140. In some embodiments, the linear rack 178 can extend in a longitudinal direction. In some embodiments, the linear rack 178 can be disposed below the bottom shelf of the device 100. In some embodiments, the linear rack 178 does not move along an axis (e.g., up or down) regardless of how the hydraulic device 110 and the outer tube 150 move.

[0076] In some embodiments, the pinion gear 179 can be directly or indirectly connected to the outer tube 150. In some embodiments, the pinion gear 179 can be attached to the outer tube 150. For example, the pinion gear 179 can be attached to the side of the outer tube 150. In some embodiments, the pinion gear 179 can be disposed below the bottom shelf. In some embodiments, the pinion gear 179 can rotate and move along an axis (e.g., upward or downward) in response to the movement of the hydraulic device 110 and the outer tube 150.

[0077] In some embodiments, the linear rack 178 may include a plurality of teeth 178a. For example, each of the plurality of teeth 178a may be spaced apart along a straight line in a vertical direction. In some embodiments, the pinion 179 may include a pinion body 179a and an indicator element 179b attached to the pinion body 179a. In some embodiments, the pinion body 179a may be attached to the outer tube 150. In some embodiments, the pinion body 179a may be configured to rotate and move along the linear rack 178 when the hydraulic device 110 and the outer tube 150 move. In some embodiments, the pinion body 179a may be configured to rotate and move along the linear rack 178 together with the indicator element 179b because the pinion body 179a may be attached to the indicator element 179b. In some embodiments, when the hydraulic device 110 and the outer tube 150 move, the pinion body 179a may move and rotate along the plurality of teeth 178a. When the hydraulic device 110 and the outer tube 150 stop moving, the pinion body 179a may engage with one of the plurality of teeth 178a. In some embodiments, indicator element 179b can indicate a change in the relative position of indicator element 179b and the plurality of teeth 178a based on the movement of hydraulic device 110 and outer tube 150. For example, indicator element 179b can indicate which of the plurality of teeth 178a is engaged with pinion body 179a. The tooth engaged with pinion body 179a can be considered an indicator of the height of shelf 210.

[0078] Figure 4 1 shows a perspective view of the device 100 and the handrail 200 according to various embodiments. In some embodiments, as Figure 4 The device 100 shown can provide a mechanical measurement of the height of the shelf 210. For example, Figure 4 The device 100 shown may be referred to as a "measuring tape concept."

[0079] Although not shown, the apparatus 100 may include a Figure 1 The hydraulic device 110, the starter 120, and the height adjuster 130. In some embodiments, the device 100 may further include Figure 4 Indicator 170 shown. In some embodiments, a handrail 200 may be provided, which may include but is not limited to the device 100 and the reference Figure 1The shelf 210. In some embodiments, although not shown, furniture, such as a chair, that can include the armrest 200 can be provided.

[0080] In some embodiments, the apparatus 100 can further include an inner tube 140 and an outer tube 150, as described with reference to Figure 1 In some embodiments, the apparatus 100 can provide a zero function to calibrate the shelf 210 to the same height as any reference point, such as the bottom of a table.

[0081] As shown in Figure 4 The indicator 170 can be used to indicate the height of the shelf 210, such as the current height and the adjusted height, in some embodiments. In some embodiments, the indicator 170 can include, but is not limited to, a window 181, a first gear 182a, a second gear 182b, a belt 183, and a measuring tape 184.

[0082] In some embodiments, the window 181 can be formed on the outer tube 150. For example, the window 181 can be formed on the upper portion of the outer tube 150.

[0083] In some embodiments, the first gear 182a and the second gear 182b can be disposed between the outer tube 150 and the inner tube 140. In some embodiments, the first gear 182a and the second gear 182b can be attached to the outer tube 150. In some embodiments, the belt 183 can be attached to the inner tube 140. In some embodiments, the belt 183 can be wound around the first gear 182a and the second gear 182b, and around the first gear and the second gear, and can be configured to move by the rotation of the first gear 182a and the second gear 182b by the movement of the hydraulic device 110 and the outer tube 150. In some embodiments, the measuring tape 184 can be attached to the belt 183, and thus the measuring tape 183 attached to the belt 183 can be attached to the inner tube 140, and can be configured to move with the movement of the belt 183. In some embodiments, the measuring tape 184 and the belt 183 can be formed of a flexible material, such as fabric.

[0084] In some embodiments, a plurality of size indicators (not shown) can be indicated on the measuring tape 184. For example, each of the plurality of size indicators can be spaced apart in a straight line in a vertical direction. In some embodiments, a portion of the measuring tape 184 can be seen through the window 181. For example, at least one of the plurality of size indicators can be seen through the window 181. In some embodiments, the window 181 can be configured to display at least one of the plurality of size indicators indicated on the measuring tape 184 as the height of the shelf, such as the adjusted height.

[0085] In some embodiments, measuring tape 184 attached to belt 183 can move in response to the movement of hydraulic device 110 and outer tube 150. For example, when hydraulic device 110 and outer tube 150 move, first gear 182a and second gear 182b can rotate, causing measuring tape 184 attached to belt 183 to move. As measuring tape 184 attached to belt 183 moves, the at least one dimensional indicator visible through window 181 can change. In this regard, the at least one dimensional indicator visible through window 181 can be considered an indication of the height of shelf 210.

[0086] Figure 5 1 shows a perspective view of a device 100 according to various embodiments. In some embodiments, as Figure 5 The device 100 shown can provide a mechanical measurement of the height of the shelf 210. For example, Figure 5 The device 100 shown may be referred to as a "physical linear indicator concept."

[0087] Although not shown, the apparatus 100 may include a Figure 1 The hydraulic device 110, the starter 120, and the height adjuster 130. In some embodiments, the device 100 may further include Figure 5 In some embodiments, although not shown, a handrail 200 may be provided, which may include (but is not limited to) the device 100 and a reference Figure 1 The shelf 210. In some embodiments, although not shown, furniture, such as a chair, may be provided that may include armrests 200.

[0088] In some embodiments, the device 100 may further include an inner tube 140 and an outer tube 150, as shown in FIG. Figure 1 As stated.

[0089] like Figure 5 As shown, the indicator 170 can be used to indicate the height of the shelf 210, for example, the current height and the adjusted height. In some embodiments, the indicator 170 may include, but is not limited to, a window 181, a fixed indicator 185 and a plurality of size indicators 186.

[0090] In some embodiments, the fenestration 181 may be formed on the outer tube 150. For example, the fenestration 181 may extend in the longitudinal direction. In some embodiments, the fenestration 181 may be formed along the outer tube 150.

[0091] In some embodiments, the fixed indicator 185 can be indicated on the outer tube 150. In some embodiments, the fixed indicator 185 can be indicated by printing, stamping, engraving, stickers and / or indentations. In some embodiments, the fixed indicator 185 can be located on the outer tube 150 adjacent to the window 181.

[0092] In some embodiments, a plurality of size indicators 186 may be indicated on the inner tube 140. In some embodiments, the plurality of size indicators 186 may be indicated by printing, stamping, engraving, embossing, stickers, and / or indentations. In some embodiments, each of the plurality of size indicators 186 may be vertically spaced apart in a straight line. In some embodiments, the plurality of size indicators 186 may be visible through the fenestration 181.

[0093] In some embodiments, the fixed indicator 185 can be located on the outer tube 150 adjacent to the plurality of size indicators 186, such that the fixed indicator 150 can point to a gap between two of one or more size indicators 186 in the plurality of size indicators 186 (hereinafter referred to as a "corresponding size indicator") at any adjusted height of the shelf 210. For example, the fixed indicator 185 can be aligned with the corresponding size indicator.

[0094] In some embodiments, the window 181 can be configured to display the relative position change between the fixed indicator 185 and the plurality of dimensional indicators 186 based on the movement of the hydraulic device 110 and the outer tube 150 as the height of the shelf 210, such as the adjusted height.

[0095] In some embodiments, fixed indicator 185 can move according to the movement of hydraulic device 110 and outer tube 150. For example, when hydraulic device 110 and outer tube 150 move, fixed indicator 185 moves. As fixed indicator 185 moves, the corresponding size indicator can change. Here, the changed corresponding size indicator can be regarded as an indication of the height of shelf 210.

[0096] As described above, the apparatus 100 according to various embodiments can provide stepless height adjustment by using vertical motion rather than rotational motion to adjust the height of the shelf 210. In addition, the apparatus 100 according to various embodiments can adjust the height of the shelf 210 by using the hydraulic device 110, thereby allowing the shelf 210 to move steplessly between a lower height position and a higher height position.

[0097] Furthermore, the apparatus 100 according to various embodiments can adjust the height of the shelf 210 with high precision, for example, by using the height adjuster 130. Furthermore, the apparatus 100 according to various embodiments can measure the height of the shelf 210 with high precision, for example, by using a battery-powered electronic high-precision height reader (e.g., a reference Figure 1 and Figures 2A-2D The indicator 170) or the use of mechanical elements (e.g., reference Figures 3 to 5 The indicator 170 described above can enhance the function of the hydraulic device 110.

[0098] Further, the apparatus 100 according to various embodiments can provide a height indication of the shelf 210. Thus, the user can identify the height of one armrest (e.g., the left armrest) of the chair and precisely adjust both armrests (e.g., the left armrest and the right armrest) to a desired and / or similar height.

[0099] While the present disclosure has been particularly shown and described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims. Therefore, the scope of the present disclosure is indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein.

Claims

1. A device for adjusting the height of a shelf, characterized in that The device comprises: a hydraulic device configured to support the shelf and configured to move along an axis to adjust the height of the shelf; and A starter is connected to the hydraulic device and is configured to start and control the hydraulic device to move along the axis to adjust the height of the shelf, or to deactivate the hydraulic device to stop at the adjusted height based on a first external force on the starter.

2. The device according to claim 1, characterized in that The apparatus further includes a height adjuster connected to the hydraulic device and configured to displace the hydraulic device along the axis based on a second external force on the height adjuster to adjust the height of the shelf.

3. The device according to claim 2, characterized in that The apparatus further includes an indicator configured to indicate the adjusted height of the shelf.

4. The device according to claim 3, characterized in that The hydraulic device comprises: a fluid cylinder filled with a compressed fluid; and A piston is configured to move along the axis in the fluid cylinder based on control of the actuator.

5. The device according to claim 4, characterized in that The height adjuster includes a knob connected to the fluid cylinder through an interconnecting member, and is configured to displace the hydraulic device along the axis based on the second external force acting on the knob to adjust the height of the shelf.

6. The device according to claim 5, characterized in that The actuator is configured to control the piston to move in a first direction or allow a load applied to the shelf to resist movement of the piston in a second direction opposite to the first direction when the hydraulic device is activated by the actuator.

7. The device according to claim 6, characterized in that: The hydraulic device further includes a lock; and The lock is configured to immobilize the piston when an actuator deactivates the hydraulic device.

8. The device according to claim 3, characterized in that The device further comprises: an inner tube disposed below the shelf and positioned adjacent to the hydraulic device; and An outer tube surrounds at least a portion of the hydraulic device and at least a portion of the inner tube, the outer tube being configured to support the shelf and configured to move according to movement of the hydraulic device.

9. The device according to claim 8, characterized in that The indicator is further configured to measure the adjusted height of the shelf to indicate the adjusted height of the shelf.

10. The device according to claim 9, characterized in that The indicator includes: a linear track connected to the inner tube; a sensor connected to the outer tube; and a display configured to display the adjusted height of the shelf, Wherein, the sensor is configured to detect a position of the linear track relative to the sensor, and measure the adjusted height of the shelf based on the detection result.

11. The device according to claim 10, characterized in that The device further includes a zero function button disposed on the outer tube, the zero function button being configured to calibrate the shelf relative to a reference point.

12. The device according to claim 10, characterized in that The indicator further includes a main circuit board housing at least one of a battery, a light source, and the sensor.

13. The device according to claim 12, characterized in that The light source is configured to emit light based on whether the display is turned on.

14. The device according to claim 9, characterized in that The indicator includes: A linear potentiometer, comprising: a rail connected to the outer tube; and a slider connected to the inner tube and movably provided on the rail; and a display configured to display the adjusted height of the shelf, wherein the position of the slider on the track changes according to the movement of the outer tube, and The linear potentiometer is configured to detect resistance based on a change in position of the slider on the rail, and to measure an adjusted height of the shelf based on the detection result.

15. The device according to claim 8, characterized in that The indicator includes: a linear rack connected to the inner tube and comprising a plurality of teeth; and a pinion gear including a pinion gear body connected to the outer tube and an indicator element connected to the pinion gear body, wherein the pinion body with the indicator element is configured to move along the linear rack and mesh with one of the plurality of teeth in accordance with movement of the outer tube, and The indicator element is configured to display a relative position change between the indicator element and the plurality of teeth according to the movement of the outer tube and the pinion body as the adjusted height of the shelf.

16. The device according to claim 8, characterized in that The indicator includes: a window on the outer tube; a first gear and a second gear, wherein the first gear and the second gear are connected to the outer tube; a belt connected to the inner tube, the belt being wound around the first gear and the second gear and configured to move according to rotation of the first gear and rotation of the second gear through movement of the outer tube; and a measuring tape attached to said belt, wherein a plurality of size indicators are indicated on the measuring tape, and The window is configured to display at least one dimensional indicator of the plurality of dimensional indicators indicated on the measuring tape as an adjusted height of the shelf.

17. The device according to claim 8, characterized in that The indicator comprises a window on the outer tube, wherein: Fixed indicators are indicated on the outer tube, A plurality of size indicators are indicated on the inner tube and are visible through the window, and The window is configured to display a relative position change between the fixed index and the plurality of size indexes based on the movement of the outer tube as the adjusted height of the shelf.

18. An armrest, characterized in that: The armrest comprises: a shelf configured to place an object thereon; and Device for adjusting the height of a shelf, the device comprising: a hydraulic device configured to support the shelf and configured to move along an axis to adjust the height of the shelf; and A starter is connected to the hydraulic device and is configured to start and control the hydraulic device to move along the axis to adjust the height of the shelf, or to deactivate the hydraulic device to stop at the adjusted height based on a first external force on the starter.

19. The armrest according to claim 18, characterized in that The apparatus also includes a height adjuster connected to the hydraulic device and configured to displace the hydraulic device along the axis to adjust the height of the shelf based on a second external force on the height adjuster.

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