Adjustable lifting system

Abstract

A lifting system is designed to lift and lower a load. The lifting system may include a movable portion in sliding engagement with the fixed portion. The lifting system may be configured to translate a load coupled to the movable portion relative to the fixed portion. The lifting system may also include a balancing mechanism having an arm rotatably coupled to the fixed portion and one or more springs coupled to the arm and the fixed portion. The arm may be operably coupled to the movable portion by a cord. When the movable portion translates, the arm may rotate to deflect the one or more springs to provide a lifting force to counteract the weight of the load.

Description

[0001] Priority Claim

[0002] This patent application claims the benefit of priority of U.S. Provisional Patent Application No. 63 / 476,087, filed on Dec. 19, 2022 (Attorney Docket No. 5983.478PRV) by Ergun et al., titled "ADJUSTABLE LIFT SYSTEM", the entire content of which is hereby incorporated by reference herein. Technical Field

[0003] This document generally relates to, but is not limited to, lift systems for lifting and balancing loads. Background Art

[0004] Electronic displays such as, for example, computer displays, tablets, televisions, etc., and workstations such as, for example, desks, carts, wall mounts, etc., are used in various scenarios. In some scenarios, an electronic display can be used by multiple operators. In another example, a television can be deployed in a conference center where many people use the electronic display throughout the day. In yet another example, workstations can be deployed in a workplace shared by multiple employees. Flexible and adjustable workstations can increase their utilization rate in a shared workspace. Brief Description of the Drawings

[0005] The following drawings illustrate specific embodiments of the present invention and thus do not limit the scope of the present invention. The drawings are not drawn to scale and are intended to be used in conjunction with the explanations in the following detailed description. Similar reference numerals may describe similar components in different views. Similar reference numerals with different letter suffixes may represent different instances of similar components. The drawings generally illustrate, by way of example and not limitation, various embodiments discussed in this document.

[0006] Figure 1 is a block diagram representation of a positioning device according to an example configuration of the present disclosure.

[0007] Figure 2 is an isometric view of a mobile workstation according to an example configuration of the present disclosure.

[0008] Figure 3 is an isometric view of a wall-mounted workstation according to an example configuration of the present disclosure.

[0009] Figure 4 is an isometric view of a freestanding workstation (e.g., a desk, etc.) according to an example configuration of the present disclosure.

[0010] Figure 5 is an isometric view of a wall mount for an electronic display according to an example configuration of the present disclosure.

[0011] Figure 6 It is a schematic diagram of a lifting mechanism according to an exemplary configuration of the present disclosure.

[0012] Figure 7 It is a schematic diagram of a lifting mechanism according to another exemplary configuration of the present disclosure.

[0013] Figure 8 It is a schematic diagram of a lifting mechanism according to yet another exemplary configuration of the present disclosure.

[0014] Figure 9 It is a schematic diagram of a lifting mechanism according to yet another exemplary configuration of the present disclosure.

[0015] Figure 10 It is a schematic diagram of a lifting mechanism according to yet another exemplary configuration of the present disclosure.

[0016] Figure 11 It is a schematic diagram of a lifting mechanism according to yet another exemplary configuration of the present disclosure.

[0017] Figure 12 It is a schematic diagram of a lifting mechanism according to yet another exemplary configuration of the present disclosure.

[0018] Figure 13 It is a schematic diagram of a lifting mechanism according to yet another exemplary configuration of the present disclosure.

[0019] Figure 14 It is a schematic diagram of a booster assembly according to an exemplary configuration of the present disclosure.

[0020] Figure 15 It is of the enabled configuration Figure 14 of the booster assembly.

[0021] Figure 16 It is by Figure 13 a graphical representation of the lifting force generated by the lifting mechanism.

[0022] Figure 17 It is a schematic diagram of a lifting mechanism of a freestanding workstation according to an exemplary configuration of the present disclosure.

[0023] Figure 18 It is at the maximum adjustment setting Figure 17 of the balance mechanism.

[0024] Figure 19 It is corresponding to the low position of the work surface Figure 17 of the balance mechanism.

[0025] Figure 20 It is according to an exemplary configuration of the present disclosure Figure 17 front view of the freestanding workstation.

[0026] Figure 21 It is a bottom view of a freestanding workstation.

[0027] Figure 22 It is a schematic diagram of a leg assembly according to an exemplary configuration of the present disclosure.

[0028] Figure 23 It is a schematic diagram of a leg assembly according to another exemplary configuration of the present disclosure.

[0029] Figure 24 It is a schematic diagram of a drive pulley assembly. SUMMARY OF THE INVENTION

[0030] The present disclosure relates to devices that can position a load (e.g., an electronic display, a work surface, a platform, etc.) along a travel range. In some cases, positioning can include lifting the load in a vertical direction and / or translating the load in a vertical direction. Positioning the load can also involve counteracting the weight of the load and at least a portion of the weight of the positioning device to assist a user in moving the load.

[0031] In some configurations, the positioning device can include a lifting mechanism for raising and lowering the load. The lifting mechanism generally can include a fixed portion configured to couple to a structure and a movable portion configured to couple to the load. A sliding mechanism can be coupled to the fixed portion and the movable portion, and the sliding mechanism can provide a travel range for the movable portion relative to the fixed portion. The travel range can include a high position and a low position, which in some cases can be the same as a minimum height and a maximum height. In the high position, the movable portion can be close to the upper end of the fixed portion, and in the low position, the movable portion can be close to the lower end of the fixed portion.

[0032] In some exemplary configurations, the lifting mechanism can include a balancing mechanism. The balancing mechanism can be mounted on either the fixed portion or the movable portion, and the balancing mechanism can be coupled to the fixed portion and the movable portion. The balancing mechanism can be configured to generate a lifting force for counteracting the combined weight of the load coupled to the movable portion (e.g., the weight of an electronic display, the weight of a work surface, etc.) and the weight of the movable portion. In some exemplary configurations (e.g., when the balancing mechanism is mounted on the movable portion), the lifting force can also counteract the weight of the balancing mechanism. DETAILED DESCRIPTION

[0033] The following detailed description is exemplary in nature and is not intended to limit, in any way, the scope, applicability, or configuration of the present invention. Rather, the following description provides some practical illustrations for implementing exemplary embodiments of the present invention. Examples of construction, materials, dimensions, and manufacturing processes are provided for selected elements, and all other elements employ construction, materials, dimensions, and manufacturing processes known to those of ordinary skill in the art of the present invention. Those skilled in the art will recognize that many of the examples mentioned have a variety of suitable alternatives.

[0034] Figure 1 is a block diagram representation of a positioning device 10 according to an example configuration of the present disclosure. The positioning device 10 can be one of a mobile workstation 160 (shown in Figure 2 ), a wall-mounted workstation 170 (shown in Figure 3 ), a freestanding workstation 180 (shown in Figure 4 ), a wall-mounted assembly 190 (shown in Figure 5 ), etc. The positioning device 10 can include a lifting mechanism 100 coupled to a structure 140, which includes but is not limited to a wall, a wheeled base, a cabinet, etc.

[0035] The lifting mechanism 100 can include a fixed portion 110 and a movable portion 120. The fixed portion 110 can be stationary relative to the structure 140. The movable portion 120 can be coupled to the fixed portion 110 in a movable manner (e.g., in a slidable manner, etc.). In some example configurations, one or more loads 130 (e.g., an electronic display, a work surface, a platform, etc.) can be coupled to the movable portion 120. The lifting mechanism 100 can be configured to raise and lower one or more loads 130 relative to the structure 140.

[0036] The lifting mechanism 100 can further include a balancing mechanism 150 coupled between the fixed portion 110 and the movable portion 120. The balancing mechanism 150 can be adapted to counteract a portion of the combined weight of one or more loads 130 and the weight of the movable portion 120.

[0037] Figures 2 to 5 Illustrates various applications of the positioning device 10 according to some example configurations of the present disclosure. Figures 2 to 5 Each of the example configurations shown in Figure 1 includes various components of the positioning device 10 described in the previous section with respect to

[0038] Figure 2Is an isometric view of a mobile workstation 160 according to an example configuration of the present disclosure. The mobile workstation 160 may include a lifting mechanism 100 having a fixed portion 110 (e.g., a support column 161) and a movable portion 120 (e.g., a movable bracket 162). The movable bracket 162 may be slidably engaged with the support column 161. The support column 161 may extend generally in a vertical direction from a first portion 161A to a second portion 161B. The support column 161 may be coupled to a structure 140 (e.g., a wheeled base 163) near the first portion 161A, and the movable bracket 162 may be located near the second portion 161B of the support column 161. One or more loads 130 (e.g., a platform 164, etc.) may be coupled to the movable bracket 162. The platform 164 may include a work surface 165, a display mount 166, a keyboard tray, and other components. The display mount 166 may hold an electronic display 167 above the work surface 165. The lifting mechanism 100 may be used to raise and lower the platform 164 and other components coupled to the platform 164.

[0039] Figure 2 The lifting mechanism 100 of the mobile workstation 160 may further include a balance mechanism 150. The balance mechanism 150 may be located inside the support column 161. The balance mechanism 150 may be coupled between the support column 161 and the movable bracket 162. The balance mechanism 150 may generate a lifting force for counteracting the combined weight of one or more loads 130 (e.g., the weight of the platform 164, the display mount 166, the electronic display 167, etc.) and a portion of the weight of the lifting mechanism 100 (e.g., the weight of the movable bracket 162, etc.).

[0040] Figure 3 Is an isometric view of a wall-mounted workstation 170 according to an example configuration of the present disclosure. The wall-mounted workstation 170 may include a lifting mechanism 100 having a fixed portion 110 (e.g., a support column 171) and a movable portion 120 (e.g., a movable bracket 172). The movable bracket 172 may be slidably engaged with the support column 171. The support column may be coupled to a structure 140 (e.g., a wall 173). One or more loads 130 (e.g., a work surface 174, etc.) may be coupled to the movable bracket 172. In some example configurations, one or more loads 130 may include one or more other components (e.g., an electronic display, a keyboard, a printer, etc.) coupled to the work surface 174. The lifting mechanism 100 may be configured to raise and lower one or more loads 130.

[0041] Figure 3The lifting mechanism 100 of the wall-mounted workstation 170 may further include a balancing mechanism 150. The balancing mechanism 150 may be located inside the support column 171. The balancing mechanism 150 may be coupled between the support column 171 and the movable bracket 172. The balancing mechanism 150 may generate a lifting force for counteracting the combined weight of one or more loads 130 (e.g., the weight of the work surface 174 and other components coupled to the work surface 174) and a portion of the weight of the lifting mechanism 100 (e.g., the weight of the movable bracket 172, etc.).

[0042] Figure 4 is an isometric view of a freestanding workstation 180 (e.g., a table, etc.) according to an example configuration of the present disclosure. The freestanding workstation 180 may have a lifting mechanism 100 including one or more leg assemblies 181 (e.g., a first leg assembly 181A and a second leg assembly 181B) for supporting one or more loads 130 (e.g., a work surface 175 and one or more other components coupled to the work surface 175). One or more leg assemblies 181 may include a fixed portion 110 (e.g., a first member 183) and a movable portion 120 (e.g., a second member 184 and a third member 185). The first member 183 may extend generally in a vertical direction from a first portion 183A to a second portion 183B. The first member 183 may be coupled to the foot 186 near the first portion 183A and engage the second member 184 and the third member 185 in a movable manner (e.g., in a telescoping manner) near the second portion 183B. The foot 186 may be disposed on a structure 140 (e.g., a base plate 187). As illustrated in Figure 4 The second member 184 or the third member 185 of one or more leg assemblies 181 may be coupled to the lower side portion 188 of the work surface 175. In some example configurations, a frame 189 may be coupled to the lower side portion 188 of the work surface 175. The frame 189 may be adapted to receive the second member 184 or the third member 185 of one or more leg assemblies 181 to couple one or more leg assemblies 181 to the work surface 175.

[0043] In some example configurations, one or more leg assemblies 181 may be height adjustable. One or more leg assemblies 181 may include one or more telescoping members (e.g., the second member 184 and the third member 185). One or more telescoping members may be adapted to move relative to the first member 183 to adjust the height of one or more leg assemblies 181. One or more leg assemblies 181 may further include a height adjustment mechanism 182.

[0044] The height adjustment mechanism 182 (e.g., Figures 22 to 23The height adjustment mechanism (e.g., 503 or 524) can be accommodated within one or more leg assemblies 181. The height adjustment mechanism 182 can be coupled to the first member 183, the second member 184, and the third member 185 of one or more leg assemblies 181. The height adjustment mechanism 182 can be configured to adjust the height of one or more leg assemblies 181. In some example configurations, the height adjustment mechanism 182 can include a synchronization rod (e.g., Figure 17 synchronization rod 430) for synchronizing the movement of the first leg assembly 181A with the movement of the second leg assembly 181B.

[0045] Figure 4 The lifting mechanism 100 of the freestanding workstation 180 according to an example configuration of the present disclosure can further include a balancing mechanism 150. In some example configurations, the balancing mechanism 150 can be coupled to the lower side portion 188 of the work surface 175 (e.g., coupled to the frame 189). The balancing mechanism 150 can be operably coupled to the height adjustment mechanism 182. The balancing mechanism 150 can generate a lifting force for counteracting the combined weight of one or more loads 130 (e.g., the weight of the work surface 175 and other components coupled to the work surface 175, such as the frame 189 and the balancing mechanism 150, etc.) and a portion of the weight of the lifting mechanism 100 (e.g., the weight of the second member 184 and the third member 185, etc.).

[0046] Figure 5 is an isometric view of a wall mounting assembly 190 for mounting an electronic display 191 on a wall 192 according to an example configuration of the present disclosure. For clarity, the electronic display 191 is shown as transparent in Figure 5 The wall mounting assembly 190 can include a lifting mechanism 100 having a fixed portion 110 (e.g., support column 193) and a movable portion 120 (e.g., movable bracket 194). The support column 193 can be coupled to the wall 192, and the movable bracket 194 can be slidably engaged with the support column 193. A display mount 195 can be coupled to the movable bracket 194. One or more loads 130 can be coupled to the movable bracket 194 (e.g., the display mount 195 can be adapted to receive the electronic display 191). The lifting mechanism 100 can be configured to raise and lower the electronic display 191 relative to the wall 192.

[0047] Figure 5The lifting mechanism 100 of the wall-mounted assembly 190 may further include a balancing mechanism 150. The balancing mechanism 150 may be located inside the support column 193. The balancing mechanism 150 may be coupled between the support column 193 and the movable bracket 194. The balancing mechanism 150 may generate a lifting force for counteracting the combined weight of the load 130 (such as an electronic display 191, etc.) and a part of the weight of the lifting mechanism 100 (such as the weights of the movable bracket 194 and the display mount 195, etc.).

[0048] In Figures 2 to 5 each of the applications shown, it can be understood that the load 130 (such as a platform, an electronic display, a work surface, etc.) coupled to the movable part 120 may have a wide range of weights. The range of weights may depend on the brand and model of the device (such as an electronic display, etc.), the manufacturing materials (such as the materials of the work surface, the platform, etc.). In some example configurations, the force generated by the lifting mechanism 100 may be adjustable to accommodate a wide range of weights. The adjustment of the lifting force may be accomplished by various methods, including but not limited to the adjustment of the tension of the energy storage member included in the balancing mechanism (such as by adjusting Figure 13 the tension of one or more springs 314 of the balancing mechanism 350 of Figure 13 ), the adjustment of the angle of the energy storage member included in the balancing mechanism (such as by adjusting Figure 13 the spring angle 227 between the gas spring 221 of the balancing mechanism 350 and the arm 204 of

[0049] Figure 6 is a schematic view of a lifting mechanism 100 according to an example configuration of the present disclosure. The lifting mechanism 100 may have a fixed part 110 and a movable part 120 movably (such as slidably, etc.) coupled to the fixed part 110. The fixed part 110 can be directly or indirectly coupled to a structure 140 (such as a wall, a wheeled base, etc.). One or more loads 130 (such as an electronic display, a platform, a work surface, etc.) can be directly or indirectly coupled to the movable part 120. The movable part 120 can translate relative to the fixed part 110 through a travel range 201. Thus, in some example configurations, a positioning device 10 (illustrated in Figure 6 ), including the lifting mechanism 100 (illustrated in Figures 2 to 5As shown in [figure number not provided], one or more loads 130 can be translated relative to the structure 140 by translating the movable part 120 relative to the fixed part 110. In each of these example configurations, the movable part 120 can be configured to translate along a travel range 201 between a high position 201A and a low position 201B.

[0050] In some example configurations, the lifting mechanism 100 can include a balancing mechanism 150. As Figure 6 illustrated, the balancing mechanism 150 can be coupled to the fixed part 110, and the balancing mechanism 150 can be operatively coupled to the movable part 120. The balancing mechanism 150 can generate a lifting force 203 for counteracting the combined weight 205 of one or more loads 130 coupled to the movable part 120 and the weight of the movable part 120.

[0051] In other example configurations, the balancing mechanism 150 can be coupled to the movable part 120 (e.g., coupled to a work surface 402 as Figure 20 illustrated). In such a configuration, in addition to the weight of one or more loads 130 and the movable part 120, the lifting force can also counteract the weight of the balancing mechanism 150.

[0052] In some example configurations, as Figure 6 illustrated, the balancing mechanism 150 can include an arm 204 and an adjustment mechanism 206. The arm 204 can have a first portion 204A and a second portion 204B. The arm 204 can extend along an arm axis 207 between the first portion 204A and the second portion 204B of the arm 204. The arm 204 can be made of engineering materials including but not limited to stamped sheet metal, tubes, die-cast brackets, rods, etc. The arm 204 can be rotatably coupled to the fixed part 110 at a first hinge 208 near the first portion 204A. The arm axis 207 can be oriented relative to the fixed part 110 at an arm angle 209. The arm 204 can be configured to rotate about the first hinge 208 in a first direction 210 such that the arm angle 209 can increase as the movable part 120 translates from the high position 201A to the low position 201B along the travel range 201.

[0053] The adjustment mechanism 206 can include a bracket 212, a slider 214, and a screw 216. The bracket 212 can be fixedly attached to the fixed part 110 away from the first hinge 208. The slider 214 can be slidably engaged with the bracket 212. The screw 216 can be coupled to the bracket 212 and threadedly engaged with the slider 214. The slider 214 can be configured to translate relative to the bracket 212 when the screw 216 rotates.

[0054] The lifting mechanism 100 may further include an energy storage member 220. In an exemplary configuration, the energy storage member 220 may be a gas spring 221. In other exemplary configurations, the energy storage member 220 may be any one of a compression spring, a tension spring, an elastic band, etc. The energy storage member 220 may be rotatably coupled to the arm 204 at a second hinge 222 and rotatably coupled to the adjustment mechanism 206 at a third hinge 224. As Figure 6 illustrated, the second hinge 222 may be located between a first portion 204A and a second portion 204B of the arm 204, and the third hinge 224 may be located on the slider 214.

[0055] The third hinge 224 may be configured to move towards or away from the first hinge 208 to adjust a first distance 223 between the first hinge 208 and the third hinge 224 when the slider 214 translates relative to the bracket 212. The second hinge 222 may be configured to move towards (e.g., when the arm 204 rotates in a first direction 210) or away from (e.g., when the arm 204 rotates in a second direction opposite to the first direction 210) the third hinge 224 to adjust a second distance 228 between the second hinge 222 and the third hinge 224 when the arm 204 rotates relative to the fixed portion 110.

[0056] The energy storage member 220 (e.g., the gas spring 221) may be configured to generate a force (e.g., a gas spring force 226). The gas spring force 226 may be applied between the second hinge 222 and the third hinge 224, and the gas spring force 226 may bias the arm 204 to rotate in a second direction opposite to the first direction 210. As the second distance 228 decreases when the arm 204 rotates in the first direction 210, the gas spring force 226 may increase.

[0057] An energy storage member 220 (e.g., a gas spring 221) can be oriented at an angle (e.g., a spring angle 227) relative to the arm 204. The spring angle 227 can decrease as the slider 214 translates toward the first hinge 208 to reduce the first distance 223. The spring angle 227 can also decrease as the arm 204 rotates in the first direction 210. In one extreme orientation, the third hinge 224 can be close to the first hinge 208 in the minimum adjustment configuration. The spring angle 227 can increase as the slider 214 translates away from the first hinge 208 to increase the first distance 223. In another extreme orientation, the third hinge 224 can be farthest from the first hinge 208 in the maximum adjustment configuration. The spring angle 227 in the maximum adjustment configuration can be greater than the spring angle 227 in the minimum adjustment configuration. The gas spring force 226 can be proportional to the spring angle 227 such that the gas spring force 226 in the maximum adjustment configuration can be greater than the gas spring force 226 in the minimum adjustment configuration.

[0058] The lifting force 203 provided by the balance mechanism 150 can be proportional to the gas spring force 226. Thus, as Figure 16 illustrated, the balance mechanism 150 can provide a greater lifting force 203 in the maximum adjustment configuration compared to the lifting force 203 in the minimum adjustment configuration. In an example configuration, the third hinge 224 can be located at any position between the minimum adjustment configuration and the maximum adjustment configuration.

[0059] The energy storage member 220 (e.g., a gas spring 221) can extend between the second hinge 222 and the third hinge 224. When the arm 204 rotates about the first hinge 208, the second distance 228 between the second hinge 222 and the third hinge 224 can change, thereby causing a varying tension (or compression) in the energy storage member 220. When the tension in the energy storage member 220 changes, the energy storage member 220 can apply a varying force to the arm 204 at the second hinge 222. For example, when the arm 204 rotates in the first direction 210, the second distance 228 decreases, resulting in compression of the gas spring 221 and thus increasing the gas spring force 226. Similarly, when the arm 204 rotates in a second direction opposite to the first direction 210, the second distance 228 increases, resulting in elongation of the gas spring 221 and thus decreasing the gas spring force 226.

[0060] In some example configurations, the lifting mechanism 100 may further include a rope 230. The balancing mechanism 150 may be operably coupled to the movable portion 120 via the rope 230. The rope 230 may extend from a first portion 230A to a second portion 230B. The first portion 230A may be coupled to the arm 204 at a first latch 231, and the second portion 230B may be coupled to the movable portion 120 at a second latch 232. In some example configurations, the first hinge 208 and the first latch 231 may be located on the arm axis 207, and the second hinge 222 may also be located on the arm axis 207 between the first hinge 208 and the first latch 231. In other example configurations, as Figure 6 illustrated, the second hinge 222 may be laterally offset from the arm axis 207. In still other example configurations, the first latch 231 may be located between the first hinge 208 and the second hinge 222. The rope 230 may be an elongate member made of engineering materials including but not limited to wire ropes, tensile polymer ropes, chains, cables, cords, etc.

[0061] In some example configurations, the lifting mechanism may further include a redirect pulley 234. The redirect pulley 234 may be rotatably coupled to the fixed portion 110. The rope 230 may be routed around the redirect pulley 234 between the first portion 230A and the second portion 230B. As Figure 6 illustrated, the first portion 230A of the rope 230 may be oriented at a rope angle 236 relative to the arm 204. The rope angle 236 may be defined by the positions of the redirect pulley 234 and the first latch 231. The rope angle 236 may vary as the arm 204 rotates about the first hinge 208 such that the orientation of the first latch 231 relative to the redirect pulley 234 changes. The redirect pulley 234 may redirect the rope 230 such that the second portion 230B of the rope 230 may extend between the redirect pulley 234 and the movable portion 120 in a direction parallel to the direction of movement 237 of the movable portion 120.

[0062] The force generated by the energy storage member 220 (e.g., the gas spring force 226) can act on the arm 204 at the second hinge 222. The gas spring force 226 can apply a first torque 238 on the arm in the clockwise direction. The cable force 239 supported by the cable 230 can act on the arm 204 at the first latch 231. The cable force 239 can apply a second torque 240 on the arm 204 in the counterclockwise direction. The first torque 238 and the second torque 240 can be equal to keep the arm 204 in balance. Based on the balance of the arm 204, the cable force 239 can be calculated for the gas spring force 226 at a certain position of the arm 204 (e.g., at the arm angle 209). The cable force 239 can be equal to the lifting force 203. Although the gas spring force 226 changes during the rotation of the arm 204 (e.g., due to the change of the second distance 228) as the movable part 120 translates along the travel range 201, the cable force 239 (or the lifting force 203) can be substantially constant (e.g., due to changing the spring angle 227 and changing the cable angle 236).

[0063] A portion of the force generated by the energy storage member 220 (e.g., the gas spring force 226) can be supported by the cable 230 (e.g., the cable force 239 defined by torque balance as discussed in the previous section). The cable force 239 can define the lifting force 203. The lifting force 203 can counteract at least a portion of the combined weight 205 coupled to the movable part 120 (e.g., counteract the combined weight of the movable part 120 and the weight of one or more loads 130 coupled to the movable part 120).

[0064] Figure 7 is a schematic diagram of a lifting mechanism 100 according to another example configuration of the present disclosure. In some example configurations, the lifting mechanism 100 can include an idler pulley 242. The idler pulley 242 can be coupled to the arm 204 near the second portion 204B of the arm 204. The balance mechanism 150 can be operably coupled to the movable part 120 via a cable 244. The cable 244 can elongate between a first portion 244A and a second portion 244B. The first portion 244A can be coupled to the fixed part 110 at a first latch 246, and the second portion 244B can be coupled to the movable part 120 at a second latch 247. The cable 244 can be routed around the idler pulley 242 and a redirecting pulley 234 between the first portion 244A and the second portion 244B. A portion of the gas spring force 226 generated by the gas spring 221 can be supported by the cable 244 that defines the lifting force 203 as described below.

[0065] As Figure 7As illustrated, the cable 244 can include a first section 248 and a second section 249 located between a first portion 244A and a second portion 244B. The first section 248 can extend between the first latch 246 and the idler pulley 242, and the second section 249 can extend between the idler pulley 242 and the movable part 120. The first section 248 can be oriented at a first cable angle 251 relative to the arm 204, and the second section 249 can be oriented at a second cable angle 252 relative to the arm 204. The first cable angle 251 and the second cable angle 252 can vary as the arm 204 rotates about the first hinge 208.

[0066] The second section 249 can be redirected around the redirect pulley 234 before it can be coupled to the movable part 120. The second portion 244B of the cable 244 can be parallel to the direction of movement 237 of the movable part 120. As the movable part 120 translates along the travel range 201, the arm 204 can rotate (e.g., rotate in the first direction 210), and a portion of the first section 248 can be displaced on the idler pulley 242 to the second section 249 to effect the translation of the movable part 120. The first section 248 of the cable 244 can support a first cable force 254, and the second section 249 of the cable 244 can support a second cable force 256. The first cable force 254 can be equal to the second cable force 256, and the lifting force 203 can be equal to the second cable force 256. The lifting force 203 can act on the movable part 120 to counteract at least a portion of the combined weight 205 of the movable part 120 and the weight of one or more loads 130 coupled to the movable part 120.

[0067] As Figure 7 As illustrated, the gas spring force 226 can act on the arm 204 at the second hinge 222 to apply a first torque 238 on the arm 204 in the clockwise direction. The first cable force 254 and the second cable force 256 can act on the arm 204 through the idler pulley 242 to apply a second torque 240 on the arm 204 in the counterclockwise direction. The first torque 238 and the second torque 240 can be equal to keep the arm 204 in balance. Based on the balance of the arm 204, the first cable force 238 and the second cable force 240 can be calculated at any position of the arm 204 (e.g., at any arm angle 209, by considering the first cable angle 251 and the second cable angle 252 in this instance of the arm angle 209). Although the gas spring force 226 changes due to the change of the first cable angle 251, the second cable angle 252, and the spring angle 227, the first cable force 254 and the second cable force 256 (and thus the lifting force 203) can be substantially constant.

[0068] Figures 8 to 12Schematic diagrams of lifting mechanisms 101, 102, 103 according to some example configurations of the present disclosure. The lifting mechanisms 101, 102, 103 may have a fixed portion 110 and a movable portion 120. The fixed portion 110 may extend between a first portion 110A and a second portion 110B. The fixed portion 110 may be mounted on a structure 140 (e.g., a wall 173 as shown in Figure 3 or a wheeled base 163 as shown in Figure 2 etc.), and one or more loads 130 (e.g., an electronic display 167 or a platform 164 as shown in Figure 2 or a work surface 174 as shown in Figure 3 etc.) may be coupled to the movable portion 120. The movable portion 120 is configured to translate relative to the fixed portion 110 along a travel range 201 to provide height adjustment for one or more loads 130 coupled to the movable portion 120. The movable portion 120 may translate between a high position 201A where the movable portion 120 is close to the first portion 110A and a low position 201B where the movable portion 120 is close to the second portion 110B. Various aspects of the lifting mechanism 100 described in the previous portion with respect to Figures 6 to 7 may be used in the configurations shown in Figures 8 to 12 .

[0069] In some example configurations, one or more guiding members 260 may be coupled between the fixed portion 110 and the movable portion 120. One or more guiding members 260 may be adapted to guide the movable portion 120 when the movable portion 120 translates relative to the fixed portion 110. One or more guiding members 260 may include, but are not limited to, sliders (e.g., a first slider 261 and a second slider 262 as illustrated in Figure 10 ), sliders, rollers, etc.

[0070] Figures 8 to 10 The lifting mechanisms 101, 102, 103 of Figure 7 may respectively include balance mechanisms 151, 152, 153. The balance mechanisms 151, 152, 153 may be similar to the balance mechanism 150 of Figure 7 . The balance mechanisms 151, 252, 153 may be positioned in different orientations relative to the fixed portion 110 and the movable portion 120. However, Figures 8 to 10 one or more aspects of the balance mechanism 150 of Figures 8 to 10As illustrated, the balance mechanisms 151, 152, 153 may be located near the first portion 110A of the stationary member 110. In other exemplary configurations, the balance mechanisms may be located near the second portion 110B of the stationary member 110.

[0071] In some exemplary configurations, such as Figures 8 to 9 As illustrated, a first hinge member 208 located near the first portion 204A of the arm 204 may be disposed away from the first portion 110A of the fixed portion 110, and the arm 204 may extend from the first hinge member 208 toward the first portion 110A of the fixed portion 110 such that the second portion 204B of the arm 204 is disposed near the first portion 110A of the fixed portion 110. In other configurations, such as Figure 10 As illustrated, the first hinge member 208 may be disposed near the first portion 110A of the fixed portion 110, and the arm 204 may extend from the first hinge member 208 away from the first portion 110A of the fixed portion 110 such that the second portion 204B of the arm 204 is disposed near the center of the fixed portion 110. It will be appreciated that the balance mechanisms may be disposed in many other orientations relative to the fixed portion 110 and the movable portion 120. In each configuration, the balance mechanisms may be operably coupled to the movable portion 120 via a cable 244. When the movable portion 120 translates from the high position 201A toward the low position 201B, the arm 204 may rotate in a first direction 210. The energy storage member 220 may bias the arm 204 to rotate in a second direction opposite the first direction 210.

[0072] Figures 11 to 12 are schematic views of the lifting mechanisms 104, 105 according to some exemplary configurations of the present disclosure. In some exemplary configurations, the lifting mechanisms 104, 105 may include a transition pulley assembly 264. Such as Figures 11 to 12 As illustrated, the transition pulley assembly 264 may be located near the first portion 110A of the fixed portion 110. The transition pulley assembly 264 may be rotatably coupled to the fixed portion 110. The transition pulley assembly 264 may include a first pulley 265 and a second pulley 266. The first pulley 265 may have a larger diameter than the second pulley 266. The first pulley 265 may be coaxial with the second pulley 266, and the first pulley 265 and the second pulley 266 may rotate together about a common axis 267 relative to the fixed portion 110.

[0073] In some exemplary configurations, such as Figure 11 As illustrated, the balance mechanism 154 may be located near the second portion 110B of the fixed portion 110, and in other configurations, such as Figure 12As shown in the figure, the balance mechanism 155 can be located near the first part 110A of the fixed part 110. The lifting mechanisms 104, 105 can include a first rope 268 and a second rope 269. One end of the first rope 268 can be coupled to the fixed part 110 at the first latch 246. The first rope 268 can be arranged around the idle pulley 242 and optionally around the redirecting pulley 234, and the other end of the first rope 268 can be coupled to the second pulley 266 of the transition pulley assembly 264. One end of the second rope 269 can be coupled to the movable part 120 at the second latch 247, and the other end of the second rope 269 can be coupled to the first pulley 265 of the transition pulley assembly 264. When the movable part 120 is in the high position 201A (e.g., when the movable part 120 is close to the first part 110A of the fixed part 110), the second rope 269 can be wound around the first pulley 265. When the movable part 120 translates within the travel range 201 relative to the fixed part 110, the movable part 120 can pull the second rope 269 to cause the transition pulley assembly 264 to rotate in the clockwise direction. When the transition pulley assembly 264 rotates in the clockwise direction, the first rope 268 can be wound around the second pulley 266, so that the arm 204 can rotate around the first hinge 208 in the first direction 210.

[0074] Figures 8 to 12 The energy storage member 220 (e.g., gas spring 221) can be coupled between the arm 204 and the adjustment mechanism 206. The energy storage member 220 can apply a force (e.g., gas spring force 226) to the arm 204, so as to bias the arm 204 in a direction opposite to the first direction 210. According to the balance of the arm 204, the spring force 226 can be converted into the lifting force 203 as discussed in the previous part. If the lifting mechanism 100 includes Figures 11 to 12 the transition pulley assembly 264 as shown in the figure, the lifting force 203 can be adjusted by the ratio of the radius of the second pulley 266 to the radius of the first pulley 265. The lifting force 203 can be applied to the movable part 120 to counteract the combined weight 205 of one or more loads 130 coupled to the movable part 120 and a part of the weight of the movable part 120.

[0075] Figure 13 is a schematic diagram of a lifting mechanism 300 according to another exemplary configuration of the present disclosure. Figure 13 The lifting mechanism 300 can include Figure 7One or more aspects of the lifting mechanism 100. The lifting mechanism 300 can have a fixed portion 110 coupled to the structure 140, a movable portion 120 adapted to receive one or more loads 130, and a balancing mechanism 350. The movable portion 120 can be configured to translate relative to the fixed portion 110 along a travel range 201 between a high position 201A and a low position 201B. The movable portion 120 can provide height adjustment for one or more loads 130 coupled to the movable portion 120 relative to the structure 140.

[0076] In some example configurations, the balancing mechanism 350 can include an arm 204, a first energy storage member 302, an adjustment mechanism 206, and a booster assembly 304. The arm 204 can be rotatably coupled to the fixed portion 110 about a first hinge 208. The arm 204 can be operably coupled to the movable portion 120 via a cable 244. The cable 244 can be coupled to the fixed portion 110 at a first latch 246 and to the movable portion 120 at a second latch 247. As Figure 13 illustrated, the cable 244 can be routed between the first latch 246 and the second latch 247 around an idler pulley 242 and a redirect pulley 234. The arm 204 can be configured to rotate in a first direction 210 when the movable portion translates from the high position 201A to the low position 201B.

[0077] The adjustment mechanism 206 can include a first bracket 310 and a slider 214. The first bracket 310 can be the same as Figure 7 the bracket 212. The first bracket 310 can be fixedly attached to the fixed portion 110. The slider 214 can be slidably engaged with the first bracket 310. The adjustment mechanism 206 can include a first screw 311. The first screw 311 can be rotatably coupled to the first bracket 310 and threadedly engaged with the slider 214.

[0078] The first energy storage member 302 can be coupled to the arm 204 at one end at a second hinge 222 and to the slider 214 at the other end at a third hinge 224. The first energy storage member 302 can be one of a gas spring 221, a tension spring, a compression spring, etc. As described in the previous section, the first energy storage member 302 can indirectly define a portion of the lifting force 203. The first screw 311 is configured to translate the slider 214 relative to the first bracket 310 to change the spring angle 227 between the first energy storage member 302 (e.g., the gas spring 221) and the arm 204.

[0079] As Figure 13As illustrated, the booster assembly 304 can be coupled at one end to the fixed portion 110 and at the other end rotatably coupled to the arm 204 at the fourth hinge 312. As will be apparent in the following sections, the booster assembly 304 can apply an additional force to the arm 204 to increase the lifting force 203.

[0080] The booster assembly 304 can include a second energy storage member 306. The second energy storage member 306 can include a gas spring, a tension spring, a compression spring, etc. In some example configurations, the second energy storage member 306 can be selectively activated to enable lifting of heavier loads.

[0081] In some example configurations, the second energy storage member 306 can include one or more springs 314 (e.g., one or more tension springs). The one or more springs 314 can be coupled at one end to the first spring plate 315 and at the other end to the second spring plate 316. The first spring plate 315 can be coupled to the fixed portion 110, and the second spring plate 316 can be rotatably coupled to the arm 204 at the fourth hinge 312.

[0082] In some example configurations, the balance mechanism 350 can further include a second bracket 318. The second bracket 318 can be fixedly attached to the fixed portion 110. The second screw 319 can be rotatably coupled to the second bracket 318 and threadedly engaged with the first spring plate 315. The second screw 319 can be configured to translate the first spring plate 315 along the axial direction of the second screw 319 when the second screw 319 rotates, so as to enable adjustment of the tension of the one or more springs 314.

[0083] The first force 321 (e.g., a gas spring force 226 similar to Figure 7 generated by the first energy storage member 302) and the second force 322 (e.g., the force generated by the one or more springs 314) generated by the second energy storage member 306 can apply a first torque 325 on the arm 204 in a second direction opposite to the first direction 210. The first cable force 254 and the second cable force 256 carried by the first section 248 and the second section 249 of the cable 244, respectively, can apply a second torque 326 on the arm 204 in the first direction 210. The first cable force 325 and the second cable force 326 can be equal. To keep the arm 204 in balance, the first torque 325 can be equal to the second torque 326, and thus, the first cable force 325 and the second cable force 326 can be calculated based on the balance of the arm 204. The second cable force 326 can be equal to the lifting force 203. The lifting force 203 can counteract at least a part of the combined weight 205 coupled to the movable portion 120.

[0084] Figures 14 to 15 FIG. Figures 14 to 15 is a schematic view of a booster assembly 304 according to an exemplary configuration of the present disclosure. The booster assembly 304 may include a first tube 331, a second tube 332, and a rod 333. The first tube 331, the second tube 332, and the rod 333 may be concentric about a booster axis 335.

[0085] The first tube 331 may be extensible between a first end 331A and a second end 331B. The first end 331A of the first tube 331 may be closed, and a first ring 336 may be fixedly attached to the first end 331A. The first tube 331 may be rotatably coupled to a fixed portion 110 at the first ring 336 (e.g., rotatably coupled to a second bracket 318 of Figure 13 ). The second end 331B of the first tube 331 may be open, and the second end 331B may be adapted to receive the second tube 332.

[0086] The second tube 332 may be extensible between a first end 332A and a second end 332B. The first end 332A of the second tube 332 may be adapted to be inserted into the first tube 331 through an opening in the second end 331B of the first tube 331. The second end 332B of the second tube 332 may be closed, and an orifice 337 may be formed in the second end 332B. The second tube 332 may be at least partially located inside the first tube 331. The second tube 332 may be slidably engaged with the first tube 331, and the second tube 332 may be configured to translate relative to the first tube 331 along the booster axis 335.

[0087] The rod 333 may be extensible between a first end 333A and a second end 333B. The rod 333 may be inserted into the second tube 332 through the orifice 337 located in the second end 332B of the second tube 332. The rod 333 may be at least partially located inside the second tube 332. The first end 333A of the rod 333 may be located inside the second tube 332, and the second end 333B of the rod 333 may extend from the second end 332B of the second tube 332. A second ring 338 may be fixedly attached to the second end 333B of the rod 333. The rod 333 may be rotatably coupled to the arm 204 at the second ring 338 (e.g., rotatably coupled to the arm 204 at a fourth hinge 312). The rod 333 may be slidably engaged with the second tube 332, and the rod 333 may be configured to translate relative to the second tube 332 along the booster axis 335.

[0088] The first tube 331, the second tube 332, and the rod 333 may be slidably engaged with each other to form a telescoping tube assembly 339. As Figure 15As illustrated, the second tube 332 can extend from the first tube 331, and the rod 333 can extend from the second tube 332. The telescoping tube assembly 339 can be coupled between the second bracket 318 (as shown in Figure 13 shown) and the fourth hinge 312 located on the arm 204.

[0089] The rod 333 can be coupled with a first support 340 and a second support 342 near the first end 333A and the second end 333B, respectively. As shown in Figure 14 illustrated, the first support 340 can be located inside the second tube 332 near the first end 332A, and the second support 342 can be located outside the second tube 332 near the second end 332B. The second end 332B of the second tube 332 can be adapted to rest on the second support 342.

[0090] The booster assembly 304 can further include a compression spring 345. The compression spring 345 can be located inside the second tube 332 and concentric with the second tube 332. The rod 333 can be at least partially located inside the compression spring 345. The compression spring 345 can be coupled to the first support 340 at one end and to the second end 332B of the second tube 332 at the other end. In some exemplary configurations, the compression spring 345 can be compressed between the first support 340 and the second end 332B of the second tube 332 to bias the second tube 332 towards the second support 342.

[0091] The booster assembly 304 can be configured to form an approach angle 347 between the telescoping tube assembly 339 and the arm 204. As shown in Figures 14 to 15 illustrated, the approach angle 347 can vary as the arm 204 rotates about the first hinge 208 in the first direction 210.

[0092] In some exemplary configurations, as shown in Figure 15 illustrated, the booster assembly 304 can include a fastener 348. The fastener 348 can be coupled to the first tube 331 and selectively coupled to the second tube 332. The fastener 348 can be a mechanical component including but not limited to a fastener, a hook, a latch, a tie, a bolt, etc. The fastener 348 can be coupled to an actuator (e.g., a mechanical actuator including but not limited to a handle, a lever, etc. or an electronic actuator including but not limited to an electric motor, a solenoid, etc.).

[0093] The booster assembly 304 can have a locked configuration and an unlocked configuration. In the locked configuration of the booster assembly 304, the fastener 348 can be adapted to engage both the first tube 331 and the second tube 332 to fix the second tube 332 relative to the first tube 331. In the unlocked configuration of the booster assembly 304, the fastener 348 can be disengaged from one or both of the first tube 331 and the second tube 332. In the unlocked configuration, the second tube 332 can translate freely relative to the first tube 331 along the booster axis 335. The fastener 348 can be selectively actuated to place the booster assembly 304 in the locked configuration.

[0094] In some example configurations, the fastener 348 can be actuated when the movable part 120 is in the high position 201A. When the fastener 348 is actuated, the booster assembly 304 can be enabled to provide an additional lifting force 203. As Figure 15 illustrated, when the booster assembly 304 is enabled, the second tube 332 cannot translate relative to the first tube 331 when the arm 204 rotates in the first direction 210 during translation of the movable part 120. However, the rod 333 is coupled to the arm 204, and the rod 333 can translate relative to the second tube 332 when the arm 204 rotates in the first direction 210. As Figure 15 illustrated, the distance with the compression spring 345 positioned between the first support 340 and the second end 332B of the second tube 332 can be reduced, resulting in compression of the compression spring 345. Accordingly, a second force 322 can be generated by the compression spring 345 on the rod 333 in the axial direction of the rod 333 (e.g., in the direction along the booster axis 335). As Figure 13 and Figure 15 illustrated, the second force 322 generated by the booster assembly 304 can be applied to the arm 204 at the fourth hinge 312.

[0095] Figure 16 is a graphical representation of the lifting force 203 generated by Figure 13 the balance mechanism 350. The lifting force 203 can be applied to the movable part 120 to counteract at least a portion of the combined weight 205 (e.g., counteract the combined weight of one or more loads 130 coupled to the movable part 120 and the weight of the movable part 120) over the entire travel range 201 of the movable part 120 from the high position 201A to the low position 201B. Although the first force 321 (e.g., the gas spring force 226 generated by Figure 13 the gas spring 221) increases and the second force 322 generated by Figure 13 one or more springs 314 increases, the lifting force 203 can be constant.

[0096] The lifting force 203 can have a low force range 360 and a high force range 365. When the booster assembly 304 is disabled (e.g., the fastener 348 is not actuated and the second tube 332 can move relative to the first tube 331), the lifting force 203 can be generated only by the first energy storage member 302 (e.g., by the gas spring 221), and thus the lifting force 203 can be in the low force range 360. The third hinge member 224 can be oriented between a minimum adjustment configuration and a maximum adjustment configuration by manipulating the adjustment mechanism 206 (e.g., by moving the third hinge member 224 towards or away from the first hinge member 208 by rotating the first screw 311) to vary the lifting force 203 between a minimum lifting force 360A and a maximum lifting force 360B within the low force range 360. When the booster assembly 304 is enabled (e.g., the fastener 348 is actuated and the second tube 332 is stationary relative to the first tube 331), the lifting force 203 can be generated by both the first energy storage member 302 and the booster assembly 304, and thus the lifting force 203 can be in the high force range 365. When enabled, the booster assembly 304 can cause a force increase 369 to place the lifting force 203 in the high force range 365. In the high force range 365, the adjustment mechanism 206 can still be manipulated (e.g., by rotating the first screw 311) to vary the lifting force 203 between a minimum lifting force 365A and a maximum lifting force 365B within the high force range 365.

[0097] Figure 17 is a schematic view of a lifting mechanism 401 (e.g., Figure 4 the lifting mechanism 100 of the freestanding workstation 180) according to an example configuration of the present disclosure. The lifting mechanism 401 can utilize one or more aspects of the lifting mechanisms discussed in the previous sections with respect to Figures 6 to 16 . The lifting mechanism 401 can include a balance mechanism 450, one or more leg assemblies 420, and a height adjustment mechanism 425. The height adjustment mechanism 425 can be at least partially located inside the one or more leg assemblies 420 and operably coupled between the one or more leg assemblies 420 and the balance mechanism 410. The one or more leg assemblies 420 can be configured in different forms, including but not limited to two-member telescoping nested legs (e.g., Figure 22 the leg assembly 500), three-member telescoping nested legs (e.g., Figure 23 the leg assembly 520), etc. As Figures 22 to 23 illustrated, the height adjustment mechanism 425 can also take different forms depending on the configuration of the one or more leg assemblies 420.

[0098] The balance mechanism 410 can be coupled to the lower side portion 404 of the work surface 402 (e.g., coupled to Figure 4the lower side portion 188 of the work surface 175 of the freestanding workstation 180). In some example configurations, as Figure 17 illustrated in, the frame 406 can be coupled to the lower side portion 404, and the balance mechanism 410 can be coupled to the frame 406.

[0099] In some example configurations, one or more leg assemblies 420 can include a first member 421, a second member 422, and a third member 423. As Figure 20 illustrated in, the first member 421, the second member 422, and the third member 423 can be slidably engaged with each other to adjust the height of one or more leg assemblies 420. The third member 423 can be coupled to the work surface 402, and the first member 421 can be coupled to one or more feet 428 (as Figure 20 shown in). In other example configurations, one or more leg assemblies 420 can include a first member 421 and a second member 422. The second member 422 can be slidably engaged with the first member 421. The second member 422 can be coupled to the work surface 402, and the first member 421 can be coupled to one or more feet 428. One or more feet 428 can be positioned on the base plate 429. The work surface 402 coupled to one or more leg assemblies 420 and one or more feet 428 can form a freestanding workstation 400.

[0100] The height adjustment mechanism 425 (e.g., Figures 22 to 23 the height adjustment mechanisms 503 and 524 of) can be at least partially located inside one or more leg assemblies 420. In some example configurations, the height adjustment mechanism 425 can include a synchronization rod 430. The synchronization rod 430 can extend between the first leg assembly 420A and the second leg assembly 420B, and can synchronize the movement of the first leg assembly 420A with the movement of the second leg assembly 420B. The height adjustment mechanism 425 can cooperate with the balance mechanism 410 to adjust the length of one or more leg assemblies 420 to provide height adjustment of the frame 406 and the work surface 402 relative to the base plate 429.

[0101] In some example configurations, as Figure 17 illustrated in, the balance mechanism 410 can include an arm 411, a gas spring 412, and an adjustment mechanism 413. The balance mechanism 410 can use Figure 7One or more aspects of the balancing mechanism 150. The arm 411 may be rotatably coupled to the frame 406 at the first hinge 415. The arm 411 may be operatively coupled to one or more leg assemblies 420, and the arm 411 may be configured to rotate in a first direction 417 or in a second direction opposite to the first direction 417 when the frame 406 and the working surface 402 are respectively conveyed toward or away from the base plate 429.

[0102] The adjustment mechanism 413 may be coupled to the frame 406, and the gas spring 412 may be coupled between the arm 411 and the adjustment mechanism 413. The adjustment mechanism 413 may be configured to adjust the angle between the gas spring 412 and the arm 411 (e.g., change Figure 6 the spring angle 227) as discussed in the previous section. The gas spring 412 may bias the arm 411 to rotate in a second direction opposite to the first direction 417.

[0103] In some example configurations, the height adjustment mechanism 425 may include a drive pulley assembly 437. As Figure 17 illustrated, the drive pulley assembly may include a wheel 431 and one or more bushings 432 coupled to the synchronizing rod 430. The synchronizing rod 430 may extend between a first end 430A and a second end 430B along a rod axis 433. One or more bushings 432 having apertures 434 may be fixedly attached to the frame 406. In other example configurations, one or more bushings 432 may be directly coupled to the lower side portion 404 of the working surface 402. The wheel 431 may be concentric with the synchronizing rod 430, and the wheel 431 may be fixedly attached to the synchronizing rod 430 between the first end 430A and the second end 430B.

[0104] The synchronizing rod 430 may be inserted through the apertures 434 in one or more bushings 432. One or more bushings 432 may hold the synchronizing rod 430 at a distance from the lower side portion 404 of the working surface 402 and enable the synchronizing rod 430 to freely rotate relative to the working surface 402 about the rod axis 433. The wheel 431 may be adapted to rotate in unison with the synchronizing rod 430 relative to the working surface 402.

[0105] The rod axis 433 may be substantially horizontal and parallel to the working surface 402. The synchronizing rod 430 may be made of engineering materials including but not limited to steel rods or tubes, aluminum rods or tubes, etc. A key 435 (e.g., a key shaped as one of a square, rectangle, hexagon, star, ellipse, triangle, polygon, etc.) may be formed near the first end 430A and the second end 430B of the synchronizing rod 430. The key 435 may be adapted to engage one or more leg assemblies 420.

[0106] The synchronization rod 430 may be coupled to one or more leg assemblies 420 (e.g., coupled to the first leg assembly 420A and the second leg assembly 420B near the first end 430A and the second end 430B of the synchronization rod 430, respectively). When the work surface 402 translates relative to the base plate 429, the synchronization rod 430 may cooperate with one or more leg assemblies 420 to rotate about the rod axis 433 relative to the work surface 402.

[0107] In some example configurations, the balance mechanism 410 may include an idler pulley 440, a redirecting pulley 441, and a cord 442 (e.g., a rope, a chain, a cable, a string, etc.). The idler pulley 440 may be rotatably coupled to the arm 411, and the redirecting pulley 441 may be rotatably coupled to the frame 406. One end of the cord 442 may be coupled to the frame 406 (or to the lower side portion 404) at a first latch 443. The first latch 443 may be a hook, a clamp, a tie, etc. The cord 442 may be routed around the idler pulley 440 and the redirecting pulley 441, and the other end of the cord 442 may be coupled to the wheel 431. The cord 442 may be configured to wind around the wheel 431 when the work surface 402 translates toward the base plate 429 and to unwind from the wheel 431 when the work surface 402 translates away from the base plate 429.

[0108] One or more leg assemblies 420 may be height adjustable (e.g., telescopically adjustable as illustrated in Figure 4 . One or more leg assemblies 420 may be adapted to translate the frame 406 and the work surface 402 relative to the base plate 429. The height adjustment mechanism 425 may be at least partially located inside one or more leg assemblies 420. The height adjustment mechanism 425 may include a drive pulley 445. The drive pulley 445 may be rotatably coupled to one or more leg assemblies 420 near the work surface 402 (e.g., rotatably coupled to a third member 185 of one or more leg assemblies 181 of the freestanding workstation 180 as in Figure 4 . The drive pulley 445 may be operatively coupled to the height adjustment mechanism 425 of one or more leg assemblies 420 (e.g., the height adjustment mechanisms 503 and 524 as in Figures 22 to 23 . When adjusting the height of one or more leg assemblies 420, the drive pulley 445 may rotate about the drive pulley axis 446 relative to one or more leg assemblies 420. The drive pulley axis 446 may be substantially horizontal.

[0109] An aperture 447 may be formed in the drive pulley 445 near its center (e.g., the aperture 515 shown in Figure 22 or Figure 23The orifice 536 shown in). The orifice 447 may have a key shape (e.g., square, rectangular, hexagonal, star-shaped, etc.) that matches the key 435 formed on the synchronizing rod 430 near the first end 430A and the second end 430B. The orifice 447 may be adapted to receive the key 435. The drive pulley axis 446 may coincide with the rod axis 433. The drive pulley 445 may be configured to rotate the synchronizing rod 430 and drive the balance mechanism 410 (enable the balance mechanism 410, move the balance mechanism 410, etc.) when the work surface translates relative to the base plate 429.

[0110] Figures 18 to 19 is a schematic view of a balance mechanism 450 according to some example configurations of the present disclosure. The balance mechanism 450 may include a main bracket 451. The main bracket 451 may be coupled to the lower side portion of the work surface (e.g., coupled to Figure 4 the lower side portion 188 of the work surface 175). In some example configurations, the main bracket 451 may include a first bracket 452, a second bracket 453, and a third bracket 454 for attaching one or more components of the balance mechanism 450 to the main bracket 451. The first bracket 452, the second bracket 453, and the third bracket 454 may be fixedly attached to the main bracket 451. In other example configurations, the first bracket 452, the second bracket 453, and the third bracket 454 may be formed from the main bracket 451 (e.g., by bending, stamping, extrusion, etc.).

[0111] The balance mechanism 450 may also include a gas spring 455, an arm 460, a booster assembly 470, and an adjustment mechanism 480. The arm 460 may be rotatably coupled to the main bracket 451 at a first hinge 461 near one end of the arm 460, and an extension bracket 462 may be fixedly attached near the other end of the arm 460. The extension bracket 462 may assist in coupling one or more components of the balance mechanism to the arm 460. In other example configurations, the arm 460 and the extension bracket 462 may be formed in a single component. In other exemplary configurations, the extension bracket 462 may be omitted, and one or more components of the balance mechanism 450 may be directly coupled to the arm 460.

[0112] The balance mechanism 450 may be operably coupled to the height adjustment mechanism 425 to, for one or more loads coupled to the lifting mechanism (e.g., coupled to Figure 4Provide lifting assistance during height adjustment of the working surface 175 of the lifting mechanism 100. When adjusting the height of the load, the arm 460 can be adapted to rotate in a first direction 463 or in a second direction opposite to the first direction 463 (e.g., the arm 460 can rotate in the first direction 463 when the load is lowered and rotate in the second direction when the load is raised). The balance mechanism 450 can counteract at least a portion of the weight of the load coupled to the lifting mechanism.

[0113] The adjustment mechanism 480 can be coupled to the main bracket 451 near the first hinge 461. The adjustment mechanism 480 can include a slider 481 and a first screw 482. The slider 481 can engage the first bracket 452 in a slidable manner. The first screw 482 can be coupled to the first bracket 452 and threadedly engage the slider 481. The slider 481 is configured to translate relative to the first bracket 452 when the first screw 482 rotates.

[0114] The gas spring 455 can be coupled at one end to the extension bracket 462 at the second hinge 456 and at the other end to the slider 481 at the third hinge 457. The gas spring 455 can be configured to bias the arm 460 to rotate in a second direction opposite to the first direction 463.

[0115] The slider 481 can translate relative to the first bracket 452 to change the spring angle 484 between the gas spring 455 and the arm 460. As Figure 16 illustrated, the slider 481 can translate between a minimum adjustment configuration (e.g., the slider 481 is close to the first hinge 461) and a maximum adjustment configuration (e.g., as Figure 18 illustrated, the slider is farthest from the first hinge 461) to adjust the lifting force 203 generated by the balance mechanism 410.

[0116] The booster assembly 470 can be operably coupled to the main bracket 451 at one end and to the extension bracket 462 at the other end at the fourth hinge 458. The booster assembly 470 can include one or more springs 472 (e.g., one or more tension springs). One or more springs 472 can be coupled to a first spring plate 473 at one end and to a second spring plate 474 at the other end. The first spring plate 473 can be coupled to the second bracket 453 via a second screw 475. The second screw 475 can be rotatably coupled to the second bracket 453 and threadedly engaged with the first spring plate 473. The second screw 475 can be adapted to adjust the tension of one or more springs 472. When the second screw 475 rotates relative to the second bracket 453, the first spring plate 473 can move toward or away from the second bracket 453 to increase or decrease the tension on one or more springs 472, respectively. One or more springs 472 can be configured to bias the arm 460 to rotate in a second direction opposite to the first direction 463.

[0117] The balance mechanism 450 can also include one or more redirect pulleys (e.g., a first redirect pulley 485 and a second redirect pulley 486) and an idler pulley 487. The first redirect pulley 485 and the second redirect pulley 486 can be rotatably coupled to the main bracket 451, and the idler pulley 487 can be rotatably coupled to the extension bracket 462. In some example configurations, one or more redirect pulleys can be indirectly coupled to the main bracket 451 (e.g., as Figure 18 illustrated, the second redirect pulley 486 can be coupled to the third bracket 454).

[0118] The balance mechanism 450 can be operably coupled to the height adjustment mechanism 425 via a cable 490. The cable 490 can be an elongate member extending between a first portion 491 and a second portion 492. The first portion 491 of the cable 490 can be operably coupled to the main bracket 451, and the second portion 492 of the cable 490 can be operably coupled to the height adjustment mechanism 425 (e.g., coupled to Figure 17 the wheel 431). The cable 490 can be routed around the first redirect pulley 485, the idler pulley 487, and the second redirect pulley 486 between the first portion 491 and the second portion 492. The cable 490 can be made of engineering materials including but not limited to steel cables, tensile polymer ropes, chains, strings, etc.

[0119] The first portion of the cable 490 can be coupled to the main bracket 451 via a clevis bolt 493. In some example configurations, as Figure 18As illustrated, the eyebolt 493 can be coupled to the third bracket 454. The eyebolt 493 can have a threaded shaft 494 and a loop 495. The threaded shaft 494 can extend from the loop 495 in a lateral direction. A first portion 491 of the cable 490 can be coupled to the loop 495. The threaded shaft 494 can be inserted through an aperture 459 located in the third bracket 454, and a nut 496 can be threadedly engaged with the threaded shaft 494. A portion of the third bracket 454 can be at least partially located between the loop 495 and the nut 496. The nut 496 can be positioned on the threaded shaft 494 of the eyebolt 493 such that the loop 495 can be positioned at a desired distance from the third bracket 454 to eliminate slack that may occur in the cable 490 when the cable 490 is operatively coupled between the main bracket 451 and a height adjustment mechanism (e.g., Figure 17 the height adjustment mechanism 425) therebetween.

[0120] During height adjustment of the work surface 402, the synchronizing rod 430 coupled to the drive pulley 445 can rotate, causing the wheel 431 to rotate. The rotation of the wheel 431 can be configured such that a second portion 492 of the cable 490 can be wound around the wheel 431 as the work surface 402 descends. Accordingly, the height adjustment mechanism 425 can pull the second portion 492 of the cable 490 in a second direction 497 during translation of the work surface 402 toward the base plate 429. As Figure 19 illustrated, the arm 460 can rotate in a first direction 463 to enable lowering of the work surface 402.

[0121] The gas spring 455 can be compressed between the second hinge 456 and the third hinge 457 to generate a first force 465 (e.g., similar to Figure 13 the first force 321), and one or more springs 472 can be adapted to be stretched between a first spring plate 473 and a second spring plate 474 to generate a second force 466 (e.g., similar to Figure 13 the second force 322). As Figures 18 to 19 illustrated, the first force 465 can be applied to the second hinge 456, and the second force 466 can be applied to the fourth hinge 458. Depending on the balance of the arm 460, the first force 465 and the second force 466 can define a cable force 467 (e.g., such as Figure 13 the second cable force 256 discussed in the previous section). As Figure 24 illustrated, the cable force 467 can be applied to the wheel 431.

[0122] Figures 20 to 21are a front view and a bottom view of a freestanding workstation 400 according to an example configuration of the present disclosure. The freestanding workstation 400 may include a lifting mechanism 401 that includes one or more leg assemblies 420, a height adjustment mechanism 425 (e.g., Figure 23 the height adjustment mechanism 524) and a balancing mechanism 450 (e.g., Figure 18 the balancing mechanism 450).

[0123] Figure 18 The main bracket 451 of the balancing mechanism 450 may be coupled to the lower side portion 404 of the work surface 402. One or more bushings 432 may be coupled to the lower side portion 404. One or more bushings 432 may hold the synchronizing rod 430 at a distance from the lower side portion 404. A wheel 431 may be coupled to the synchronizing rod 430. The wheel 431 and the synchronizing rod 430 may be configured to rotate together about a rod axis 433 relative to the work surface 402. The balancing mechanism 450 may be operably coupled to the wheel 431 via a cable 490. The wheel 431 may be positioned on the synchronizing rod 430 such that a second portion 492 of the cable 490 may be in line with the wheel 431.

[0124] One or more leg assemblies 420 (e.g., a first leg assembly 420A and a second leg assembly 420B) may be coupled to the lower side portion 404. In some example configurations, one or more leg assemblies 420 may be directly coupled to the lower side portion 404 using one or more fasteners 498 at one end and coupled to one or more feet 428 (e.g., a first foot 428A and a second foot 428B) at the other end. One or more leg assemblies 420 may include a height adjustment mechanism 425. The height adjustment mechanism 425 may be at least partially housed inside one or more leg assemblies 420. The height adjustment mechanisms 425 housed inside the first leg assembly 420A and the second leg assembly 420B may be synchronized via the synchronizing rod 430. The height adjustment mechanism 425 may be configured to provide height adjustment of the work surface 402 relative to one or more feet 428. The height adjustment mechanism 425 may be coupled to the balancing mechanism 450 to counteract the weight of the components coupled to the lifting mechanism 401.

[0125] The synchronization rod 430 can be extended between a first end 430A and a second end 430B. The first end 430A can be located near the first leg assembly 420A, and the second end 430B can be located near the second leg assembly 420B. The synchronization rod 430 can be adapted to be coupled to the first leg assembly 420A at the first end 430A of the synchronization rod 430 and to the second leg assembly 420B at the second end 430B of the synchronization rod 430. A key 435 (e.g., a key shaped as a square, rectangle, hexagon, star, etc.) can be formed on the synchronization rod 430 near the first end 430A and the second end 430B. The key 435 located on the synchronization rod 430 can engage a height adjustment mechanism 425 located inside one or more leg assemblies 420.

[0126] Figure 22 FIG. is a schematic view of a leg assembly 500 according to an exemplary configuration of the present disclosure. The leg assembly 500 can include a first member 501 and a second member 502 slidably engaged with the first member 501. The first member 501 can be extended between a first portion 501A and a second portion 501B. The second member 502 can be extended between a first portion 502A and a second portion 502B. In some exemplary configurations, the first member 501 can be at least partially located inside the second member 502 (e.g., the second portion 501B of the first member 501 can be located inside the first portion 502A of the second member 502). In other exemplary configurations, the second member 502 can be at least partially located inside the first member 501.

[0127] The first member 501 can be coupled to a working surface near the first portion 501A (e.g., coupled to Figure 20 working surface 402), and the second member 502 can be coupled to a foot near the second portion 502B (e.g., coupled to Figure 20 one or more feet 428). The first member 501 can be configured to translate relative to the second member 502 to adjust the distance between the first portion 502A of the first member 501 and the second portion 502B of the second member 502, and thus, the leg assembly 500 can provide height adjustment of the working surface 402 relative to the feet 428. One or more sliders (e.g., ball sliders, friction sliders, sliders, rollers, etc.) can be positioned between the first member 501 and the second member 502. One or more sliders can guide the first member 501 when the first member 501 translates relative to the second member 502.

[0128] The leg assembly 500 may include a height adjustment mechanism 503 having a drive assembly 504 and a rod 505. The drive assembly 504 may be at least partially located inside the first member 501. The drive assembly 504 may be configured to rotate the synchronizing rod 430, and thus the drive assembly 504 may be configured to drive the balance mechanism 450 as discussed in the previous section.

[0129] In some example configurations, the drive assembly 504 may include a first sprocket 506 and a second sprocket 507. The first sprocket 506 may be rotatably coupled to the first member 501 near the portion 501A, and the second sprocket 507 may be rotatably coupled to the first member 501 near the second portion 501B. A tension member 508 (e.g., a chain, rope, cable, string, etc.) may be coupled to the first sprocket 506 and the second sprocket 507. As Figure 22 illustrated, the tension member 508 may form a loop around the first sprocket 506 and the second sprocket 507, and the tension member 508 may be at least partially wound around the first sprocket 506 and the second sprocket 507. The tension member 508 may be keyed (e.g., coupled, connected, attached, etc.) to the first sprocket 506 and the second sprocket 507 such that the tension member 508 may synchronize the rotation of the first sprocket 506 and the second sprocket 507.

[0130] The rod 505 may be at least partially located inside the second member 502. The rod 505 may extend between a first end 505A and a second end 505B. The first end 505A of the rod 505 may be coupled to the second member 502 near the second portion 502B, and the second end 505B of the rod 505 may be located inside the first member 501. The tension member 508 may be fixedly attached to the rod 505 at a fastener 509 near the second end 505B of the rod 505. The fastener 509 may be located inside the first member 501 between the first sprocket 506 and the second sprocket 507. The fastener 509 may be fixedly attached to the rod 505, and when the first member 501 translates relative to the second member 502, the fastener 509 may translate relative to the first member 501. As Figure 22 illustrated, since the tension member 508 is keyed to the first sprocket 506 and the second sprocket 507, the first sprocket 506 and the second sprocket 507 may be configured to rotate relative to the first member 501 in a first direction 511 when the first member 501 translates relative to the second member 502 (e.g., when the first member 501 moves toward the second portion 502B of the second member 502), and when the first member 501 translates relative to the second member 502 (e.g., when the first member 501 moves toward the second portion 502B of the second member 502), a portion of the tension member 508 may translate in a second direction 512.

[0131] The first sprocket may have an aperture 515 formed near its center. The aperture 515 may have a shape (e.g., square, rectangle, hexagon, star, etc.) that matches a key 435 formed on the synchronization rod 430 (e.g., keys 435 formed on the first end 430A and the second end 430B of the synchronization rod 430). The aperture 515 may be adapted to receive the key 435. The synchronization rod 430 may be configured to rotate with the first sprocket 506 when the first member 501 translates relative to the second member 502.

[0132] Figure 23 is a schematic view of a leg assembly 520 according to another example configuration of the present disclosure. The leg assembly 520 may include a first member 521, a second member 522, and a third member 523. The first member 521 may be slidably engaged with the second member 522, and the second member 522 may be slidably engaged with the third member 523. The first member 521 may be elongated between a first portion 521A and a second portion 521B. The second member 522 may be elongated between a first portion 522A and a second portion 522B. The third member 523 may be elongated between a first portion 523A and a second portion 523B. In some example configurations, the first member 521 may be at least partially located inside the second member 522 (e.g., the second portion 521B of the first member 521 may be located inside the second member 522 near the first portion 522A of the second member 522), and the second member 522 may be at least partially located inside the third member 523 (e.g., the second portion 522B of the second member 522 may be located inside the third member 523 near the first portion 523A of the third member 523). In other example configurations, the second member 522 may be at least partially located inside the first member 521, and the third member 523 may be at least partially located inside the second member 522.

[0133] The first member 521 may be coupled to the working surface near the first portion 521A (e.g., coupled to Figure 20 the working surface 402), and the third member 523 may be coupled to the foot near the second portion 523B (e.g., coupled to Figure 20one or more feet 428). The first member 521 can be configured to translate relative to the second member 522 and the third member 523 to provide height adjustment for the working surface 402. A first set of one or more sliders (e.g., ball sliders, friction sliders, sliders, rollers, etc.) can be positioned between the first member 521 and the second member 522 to guide the first member 521 as the first member 521 translates relative to the second member 522. A second set of one or more sliders can be positioned between the second member 522 and the third member 523 to guide the second member 522 as the second member 522 translates relative to the third member 523.

[0134] In some example configurations, the leg assembly 520 can include a height adjustment mechanism 524 having a drive assembly 525 at least partially disposed within the first member 521 and a synchronizer assembly 526 at least partially disposed within the second member 522. The synchronizer assembly 526 can synchronize the displacement of the first member 521 relative to the second member 522 with the displacement of the second member 522 relative to the third member 523. The drive assembly 525 can be operatively coupled to Figure 21 the balance mechanism 450 to drive the balance mechanism 450 when adjusting the height of the leg assembly 520.

[0135] In some example configurations, the drive assembly 525 can include a first sprocket 531 and a second sprocket 532. The first sprocket 531 can be rotatably coupled to the first member 521 near a first portion 521A, and the second sprocket 532 can be rotatably coupled to the first member 521 near a second portion 521B. A first tension member 533 (e.g., a chain, rope, cable, string, etc.) can be coupled to the first sprocket 531 and the second sprocket 532. As Figure 23 illustrated, the first tension member 533 can form a loop around the first sprocket 531 and the second sprocket 532, and the first tension member 533 can be at least partially wound around the first sprocket 531 and the second sprocket 532. The first tension member 533 can be keyed (e.g., coupled, connected, attached, etc.) to the first sprocket 531 and the second sprocket 532 such that the first tension member 533 can synchronize the rotation of the first sprocket 531 and the second sprocket 532.

[0136] The first rod 534 can be coupled to the second member 522. The first rod 534 can be at least partially located inside the second member 522. The first rod 534 can extend between a first end 534A and a second end 534B. The first end 534A of the first rod 534 can be coupled to the second member 522 near the second part 522B, and the second end 534B of the first rod 534 can be located inside the first member 521. The first tension member 533 can be fixedly attached to the first rod 534 at a first fastener 535 near the second end 534B of the first rod 534. The first fastener 535 can be located inside the first member 521 between the first sprocket 531 and the second sprocket 532. The first fastener 535 can be fixedly attached to the first rod 534, and when the first member 521 translates relative to the second member 522, the first fastener 535 can translate relative to the first member 521. Since the first tension member 533 is keyed to the first sprocket 531 and the second sprocket 532, the first sprocket 531 and the second sprocket 532 can be configured to rotate relative to the first member 521 when the first member 521 translates relative to the second member 522. For example, as Figure 23 illustrated in, the first sprocket 531 can be configured to rotate in a first direction 511 when the first member 521 translates toward the second part 523B of the third member 523, while a portion of the first tension member 533 can be configured to translate in a second direction 512 when the first member 521 translates toward the second part 523B of the third member 523.

[0137] The first sprocket 531 can have an aperture 536 formed near its center. The aperture 536 can have a shape (e.g., square, rectangular, hexagonal, star-shaped, etc.) that matches a key 435 formed on the synchronizing rod 430 (e.g., keys 435 formed on the first end 430A and the second end 430B of the synchronizing rod 430). The aperture 536 can be adapted to receive the key 435. The synchronizing rod 430 can be configured to rotate with the first sprocket 531 when the first member 521 translates relative to the second member 522.

[0138] The synchronizer assembly 526 can include a third sprocket 541, a fourth sprocket 542, and a second rod 543. The second rod 543 can extend between a first end 543A and a second end 543B. As Figure 23 illustrated in, the first end 543A of the second rod 543 can be coupled to the second member 522 (e.g., coupled to the second part 522B of the second member 522), and the second end 543B of the second rod 543 can be located inside the first member 521. The third sprocket 541 and the fourth sprocket 542 can be rotatably coupled to the second rod 543 near the second end 543B and the first end 543A of the second rod 543, respectively. Thus, as Figure 23As illustrated, the third sprocket 541 may be rotatably coupled to the second member 522 near the first portion 522A of the second member 522, and the fourth sprocket 542 may be coupled to the second member 522 near the second portion 522B of the second member 522.

[0139] The second tension member 545 (e.g., a chain, rope, cable, cord, etc.) may be coupled to the third sprocket 541 and the fourth sprocket 542. As Figure 23 illustrated, the second tension member 545 may form a loop around the third sprocket 541 and the fourth sprocket 542, and the second tension member 545 may be at least partially wound around the third sprocket 541 and the fourth sprocket 542. The second tension member 545 may be keyed (e.g., coupled, connected, attached, etc.) to the third sprocket 541 and the fourth sprocket 542 such that the second tension member 545 may synchronize the rotation of the third sprocket 541 and the fourth sprocket 542.

[0140] The third rod 547 may be coupled to the third member 523. The third rod 547 may be at least partially located inside the third member 523. The third rod 547 may extend between a first end 547A and a second end 547B. The first end 547A of the third rod 547 may be coupled to the third member 523 near the second portion 523B, and the second end 547B of the third rod 547 may be located inside the second member 522.

[0141] The second tension member 545 may be fixedly attached to the first member 521 at a second fastener 548 near the second portion 521B of the first member 521, and the second tension member 545 may be fixedly attached to the third rod 547 at a third fastener 549 near the second end 547B of the third rod 547. The second fastener 548 and the third fastener 549 may be located between the third sprocket 541 and the fourth sprocket 542. When the first member 521 translates relative to the second member 522 and the second member 522 translates relative to the third member 523, the second fastener 548 and the third fastener 549 may translate relative to the second member 522. Since the second tension member 545 is keyed to the third sprocket 541 and the fourth sprocket 542, the third sprocket 541 and the fourth sprocket 542 may be configured to rotate equal amounts relative to the second member 522 to equalize the movement of the first member 521 relative to the second member 522 and the movement of the second member 522 relative to the third member 523.

[0142] In some example configurations, Figure 22 the first sprocket 506 of the leg assembly 500 of Figure 23 or the first sprocket 531 of the leg assembly 520 of Figure 17The drive pulley 445 of the lifting mechanism 401. In other configurations, a separate drive pulley can be coupled to the height adjustment mechanism (e.g., coupled to Figure 22 the first sprocket 506 or coupled to Figure 22 the first sprocket 531). The drive pulley 445 can be operably coupled to the balance mechanism 410 via a drive pulley assembly 437 (shown in Figure 17 ). The drive pulley 445 can drive the balance mechanism 410 during the height adjustment of one or more leg assemblies 420 to generate a lifting force acting on the movable part to counteract the weight of one or more loads coupled to the movable part.

[0143] Figure 24 is of an exemplary configuration according to the present disclosure Figure 17 Schematic diagram of the drive pulley assembly 437. The drive pulley assembly can include a drive pulley 445 having a first radius 449, a synchronizing rod 430, and a wheel 431 having a second radius 439. The drive pulley 445, the synchronizing rod 430, and the wheel 431 can be concentric about a rod axis 433. The synchronizing rod 430 can be coupled to the drive pulley 445 as discussed in the previous section, and the wheel 431 can be coupled to the synchronizing rod 430 as illustrated in Figure 17 . The drive pulley assembly 437 can rotate about the rod axis 433 to enable the lifting mechanism 401 to raise and lower the movable part and one or more loads coupled to the movable part (e.g., Figure 17 the working surface 402).

[0144] A tension member 550 (e.g., Figure 22 the tension member 508 or Figure 23 the first tension member 533) can be coupled to the drive pulley 445. The tension member 550 can be adapted to carry at least a portion of the combined weight 552 of the movable part (e.g., Figure 4 the movable part 120 of the freestanding workstation 180, etc.) and one or more loads coupled to the movable part (e.g., Figure 4 one or more loads 130, etc.). As illustrated in Figure 24 , the tension member 550 can be adapted to rotate the drive pulley assembly 437 in a first direction 511, and the combined weight 552 acting on the drive pulley 445 via the tension member 550 can apply a first torque 554 to the drive pulley assembly 437 in the first direction 511.

[0145] The rope force 467 generated by the balance mechanism 450 and acting on the wheel 431 via the rope 490 (as in Figures 18 to 19As shown in [reference], a second torque 556 can be applied to the drive pulley assembly 437 in a direction opposite to the first direction 511. The first torque 554 can be equal to the second torque 556 to maintain the drive pulley assembly 437 in a balanced state. To maintain the drive pulley assembly 437 in a balanced state (e.g., the combined weight 552 can be offset by the rope force 467 generated by the balancing mechanism 450), the rope force 467 can be equal to the combined weight 552 multiplied by the ratio of the first radius 449 to the second radius 439.

[0146] The rope force 467 can be defined by one or more parameters of the gas spring 455, one or more parameters of one or more springs 472, and the geometry of the balancing mechanism 450. By selecting the parameters and geometry, a rope force 467 can be generated to maintain the drive pulley assembly in a balanced state. Although Figures 18 to 19 the first force 465 and the second force 466 shown in [reference] can vary during the translation of the movable part, the rope force 467 can be substantially constant due to the varying spring angle 484 and arm angle 464.

[0147] If the drive pulley assembly 437 is in a balanced state, the drive pulley assembly 437 can be stationary (e.g., the drive pulley assembly 437 cannot rotate about the rod axis 433), thereby maintaining the position (e.g., height) of the movable part and one or more loads (e.g., the work surface 402) coupled to the movable part. In the balanced state of the drive pulley assembly 437, a user of the positioning device 10 (e.g., Figure 20 the freestanding workstation 400) can adjust the height of the movable part by applying a small force to the movable part.

[0148] In some example configurations, a locking mechanism can be coupled between the movable part 120 and the fixed part 110 to maintain the position of the movable part 120 relative to the structure 140. In some example configurations, a locking assembly can be coupled between the work surface 402 or the frame 406 and the drive pulley assembly 437.

[0149] Additional considerations and aspects

[0150] Example 1 is a lifting system for raising and lowering a load, the lifting system comprising: a fixed portion that can be coupled to a structure; a movable portion that can be coupled to the load, the movable portion being translatable relative to the fixed portion; one or more sliding mechanisms coupled between the fixed portion and the movable portion, the one or more sliding mechanisms at least partially defining a travel range of the movable portion relative to the fixed portion; and a balancing mechanism coupled to the fixed portion and the movable portion, the balancing mechanism being operable to generate a lifting force to counteract the weight of the load.

[0151] In Example 2, the subject matter of Example 1 optionally includes: the balancing mechanism includes: an arm rotatably coupled to the fixed portion; an adjustment mechanism coupled to the fixed portion; an energy storage member coupled between the arm and the adjustment mechanism, the energy storage member configured to bias the arm to rotate in a first direction; and a rope coupled to the arm and the movable portion.

[0152] In Example 3, the subject matter of Example 2 optionally includes: wherein the energy storage member includes one or more of a gas spring, a compression spring, and a tension spring.

[0153] In Example 4, the subject matter of any one or more of Examples 2 to 3 optionally includes: an idler pulley coupled to the arm; and one or more redirecting pulleys coupled to the fixed portion; wherein the rope is coupled to the fixed portion at a first end and to the movable portion at a second end, wherein the rope is routed around the idler pulley and the one or more redirecting pulleys between the first end and the second end, and wherein the rope is configured to cause the arm to rotate in a second direction opposite to the first direction as the movable portion translates from a high position towards a low position.

[0154] In Example 5, the subject matter of any one or more of Examples 2 to 4 optionally includes: the adjustment mechanism includes: a bracket coupled to the fixed portion; a slider movably coupled to the bracket and rotatably coupled to the energy storage member; and a screw rotatably coupled to the bracket and threadedly engaged with the slider, the screw being adapted to cause the slider to translate relative to the bracket as the screw rotates; wherein the adjustment mechanism is configured to change an angle between the energy storage member and the arm as the slider translates relative to the bracket.

[0155] Example 6 is a lifting system for raising and lowering a work surface, the lifting system including: a work surface having a lower side; a counterbalance mechanism coupled to the lower side; and one or more leg assemblies removably coupled to the lower side and operably coupled to the counterbalance mechanism; wherein the one or more leg assemblies are configured to translate the work surface between a high position and a low position, wherein the one or more leg assemblies are configured to enable the counterbalance mechanism as the work surface is translated, and wherein the counterbalance mechanism is adapted to provide lifting assistance by counteracting the weight of the work surface as the work surface is translated between the high position and the low position.

[0156] In Example 7, the subject matter of Example 6 optionally includes a frame coupled to the lower side; wherein the one or more leg assemblies are removably coupled to the frame, and wherein the counterbalance mechanism is coupled to the frame.

[0157] In Example 8, the subject matter of any one or more of Examples 6 to 7 optionally includes: the one or more leg assemblies include: a first member coupled to the lower side; a second member slidably engaged with the first member at a first end and coupled to a foot at a second end opposite the first end; wherein the foot is adapted to be disposed on a structure, and wherein the first member is configured to translate relative to the second member to provide height adjustment for the work surface.

[0158] In Example 9, the subject matter of any one or more of Examples 6 to 8 optionally includes: the one or more leg assemblies include: a first member coupled to the lower side; a second member slidably engaged with the first member; and a third member slidably engaged with the second member at a first end and coupled to a foot at a second end opposite the first end; wherein the foot is adapted to be disposed on a structure, and wherein the first member and the second member are configured to translate relative to the third member to provide height adjustment for the work surface.

[0159] In Example 10, the subject matter of any one or more of Examples 8 to 9 optionally includes a drive pulley assembly, the drive pulley assembly including: one or more bushings, the one or more bushings being coupled to the lower side portion; a rod extending between a first rod end and a second rod end, the rod being coupled to the one or more leg assemblies at the first rod end and the second rod end and being rotatably coupled to the one or more bushings between the first rod end and the second rod end; and a wheel coupled to the rod between the first rod end and the second rod end; wherein the drive pulley assembly is removably coupled to the one or more leg assemblies and is operably coupled to the balance mechanism, wherein translation of the working surface is adapted to rotate the rod relative to the working surface, and wherein rotation of the rod is configured to enable the balance mechanism.

[0160] In Example 11, the subject matter of Example 10 optionally includes: the rod includes keys formed on the first rod end and the second rod end, wherein the keys are formed in a shape selected from the group including: star-shaped, oval, square, rectangular, hexagonal, triangular, and polygonal.

[0161] In Example 12, the subject matter of any one or more of Examples 10 to 11 optionally includes: the balance mechanism includes: an arm rotatably coupled to the lower side portion; a first adjustment mechanism coupled to the lower side portion; and a first energy storage member coupled between the arm and the first adjustment mechanism, the first energy storage member configured to bias the arm to rotate in a first direction; wherein the first adjustment mechanism is configured to change an aspect of the first energy storage member.

[0162] In Example 13, the subject matter of Example 12 optionally includes: the first adjustment mechanism includes: a bracket coupled to the lower side portion; a slider movably coupled to the bracket; and a screw rotatably coupled to the bracket and threadedly engaged with the slider; wherein the first energy storage member is rotatably coupled to the slider, wherein the screw is adapted to translate the slider relative to the bracket when the screw rotates, and wherein the first adjustment mechanism is configured to change an angle between the first energy storage member and the arm when the slider translates relative to the bracket.

[0163] In Example 14, the subject matter of Example 13 optionally includes: an idler pulley coupled to the arm; one or more redirecting pulleys coupled to the lower side portion; and a rope having a first end and a second end; wherein the rope is coupled to the lower side portion at the first end and to the wheel at the second end, wherein the rope is disposed around the idler pulley and one or more redirecting pulleys between the first end and the second end, and wherein the rope is configured to cause the arm to rotate in a second direction opposite the first direction as the work surface translates from the high position toward the low position.

[0164] In Example 15, the subject matter of any one or more of Examples 11 to 14 optionally includes: the one or more leg assemblies include a drive assembly; the drive assembly includes: a first sprocket rotatably coupled to the first member near the lower side portion, the first sprocket having an aperture formed in a shape that matches the shape of the key formed on the first rod end and the second rod end; a second sprocket rotatably coupled to the first member near the second member and remote from the first sprocket; a first tension member coupled to the first sprocket and the second sprocket, the first tension member forming a loop around the first sprocket and the second sprocket, and the first tension member keyed to the first sprocket and the second sprocket to synchronize rotation of the first sprocket with rotation of the second sprocket; and a first rod coupled to the second member at one end and to the first tension member at the other end; wherein the drive assembly is at least partially received inside the first member, and a portion of the drive assembly is configured to translate with the first member, wherein the first sprocket and the second sprocket are configured to rotate in response to height adjustment of one or more leg assemblies, and wherein the aperture is adapted to receive the key located on the first rod end or the second rod end, and wherein the first sprocket is adapted to cause the rod to rotate in response to height adjustment of the one or more leg assemblies.

[0165] In Example 16, the subject matter of any one or more of Examples 9 to 15 optionally includes: the one or more leg components further include a synchronizer component; the synchronizer component includes: a second rod extending from a first end to a second end, the first end of the second rod being coupled to the second member, and the second end of the second rod being located inside the first member; a third rod extending from a first end to a second end, the first end of the third rod being coupled to the third member, and the second end of the third rod being located inside the second member; a third sprocket rotatably coupled to the second rod near the second end of the second rod, a fourth sprocket rotatably coupled to the second rod near the first end of the second rod; and a second tension member coupled to the third sprocket and the fourth sprocket, the second tension member forming a loop around the third sprocket and the fourth sprocket, the second tension member being keyed to the third sprocket and the fourth sprocket to synchronize the rotation of the third sprocket with the rotation of the fourth sprocket, the second tension member also being coupled to the third rod near the second end of the third rod and coupled to the first member; wherein the synchronizer component is at least partially received inside the second member, and a portion of the synchronizer component is configured to translate with the second member, and wherein the synchronizer component is configured to synchronize the movement between the first member and the second member and the movement between the second member and the third member.

[0166] In Example 17, the subject matter of any one or more of Examples 12 to 16 optionally includes: the balance mechanism further includes an actuator assembly coupled between the lower side portion and the arm, wherein the actuator assembly is configured to be selectively activated to bias the arm in a first direction.

[0167] In Example 18, the subject matter of Example 17 optionally includes: the actuator assembly includes: a first spring plate rotatably coupled to the arm; a second spring plate having a threaded hole near the center of the second spring plate; a second energy storage member coupled between the first spring plate and the second spring plate; and a screw rotatably coupled to the lower side portion and threadedly engaged with the second spring plate at the threaded hole; wherein the screw is adapted to translate the second spring plate along the screw axis to adjust the tension of the second energy storage member.

[0168] In Example 19, the subject matter of any one or more of Examples 17 to 18 optionally includes: The booster assembly includes: a first tube having a first end and a second end coupled to a first ring, the first tube being rotatably coupled to the lower side portion at the first ring; a second tube slidably engaged with the first tube, the second tube having a first end located inside the first tube and a second end; a rod slidably engaged with the first tube, the rod having a first end located inside the second tube and a second end; the rod includes a first support member coupled to the first end of the rod, a second support member coupled near the second end of the rod, and a second ring coupled to the second end of the rod, the rod being rotatably coupled to the arm at the second ring; a second energy storage member coupled between the first support member and the second end of the second tube, the second energy storage member being compressed between the first support member and the second end of the second tube to bias the second tube toward the second bracket; and a fastener capable of selectively coupling between the first tube and the second tube, the booster assembly being enabled when the fastener engages both the first tube and the second tube and being disabled when the fastener disengages from one or both of the first tube and the second tube; wherein the booster assembly is configured to bias the arm to rotate in the first direction when the booster assembly is enabled.

[0169] In Example 20, the subject matter of any one or more of Examples 6 to 19 optionally includes a main bracket coupled to the lower side portion, wherein the balance mechanism is coupled to the main bracket.

[0170] Each of these non-limiting examples may exist independently or may be combined with any one or more of the other examples in any arrangement or combination.

[0171] The detailed description above includes reference to the accompanying drawings, which form a part of the detailed description. The drawings illustrate, by way of example, specific embodiments in which the subject matter may be practiced. These embodiments are also referred to herein as "examples." Such examples may include elements in addition to those shown or described. However, the inventors also contemplate examples in which only those elements shown or described are provided. Further, the inventors also contemplate examples using any combination or arrangement of those elements (or one or more aspects of those elements) shown or described with respect to a particular example (or one or more aspects of a particular example) or with respect to other examples (or one or more aspects of other examples) shown or described herein.

[0172] In the event of any inconsistency in usage between this document and any document incorporated by reference, the usage in this document shall prevail.

[0173] In the appended claims, the terms "comprising" and "including" are open-ended, i.e., a system, apparatus, article, composition, formulation, or process that includes elements in addition to those listed after such a term in a claim is still considered to fall within the scope of that claim. Further, in the appended claims, the terms "first", "second", "third", etc. are used only as labels and are not intended to impose numerical requirements on their objects.

[0174] The above description is intended to be illustrative and not restrictive. For example, the above examples (or one or more aspects of the above examples) may be used in combination with each other. For instance, other embodiments may be used by those of ordinary skill in the art after reviewing the above description. The abstract is provided to comply with 37 C.F.R. § 1.72(b) to allow the reader to quickly ascertain the nature of the technical disclosure. The abstract is submitted on the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Further, in the above detailed description, various features may be combined to simplify the disclosure. This should not be construed as meaning that the disclosed features not claimed are necessary for any claim. Rather, the subject matter of the invention may lie in less than all of the features of a particular disclosed embodiment. Accordingly, the appended claims are hereby incorporated as examples or embodiments into the detailed description, where each claim stands on its own as a separate embodiment, and it is contemplated that such embodiments may be combined with each other in various combinations or permutations. The scope of the subject matter should be determined with reference to the appended claims and the full scope of equivalents to such claims.

Claims

1. A lifting system for raising and lowering a load, the lifting system comprising: A fixed part that can be coupled to a structure; A movable part that can be coupled to the load, the movable part being translatable relative to the fixed part; One or more sliding mechanisms coupled between the fixed part and the movable part, the one or more sliding mechanisms at least partially defining a travel range of the movable part relative to the fixed part; And A balance mechanism coupled to the fixed part and the movable part, the balance mechanism being operable to generate a lifting force for counteracting the weight of the load.

2. The lifting system according to claim 1, wherein the balance mechanism comprises: An arm rotatably coupled to the fixed part; An adjustment mechanism coupled to the fixed part; An energy storage member coupled between the arm and the adjustment mechanism, the energy storage member configured to bias the arm to rotate in a first direction; And A rope coupled to the arm and the movable part.

3. The lifting system according to claim 2, wherein The energy storage member includes one or more of a gas spring, a compression spring, and a tension spring.

4. The lifting system according to claim 2, further comprising: An idler pulley coupled to the arm; And One or more redirecting pulleys coupled to the fixed part; Wherein the rope is coupled to the fixed part at a first end and to the movable part at a second end, Wherein the rope is routed around the idler pulley and one or more redirecting pulleys between the first end and the second end, and Wherein the rope is configured to cause the arm to rotate in a second direction opposite to the first direction when the movable part translates from a high position towards a low position.

5. The lifting system according to claim 2, wherein the adjustment mechanism comprises: A bracket coupled to the fixed part; A slider movably coupled to the bracket and rotatably coupled to the energy storage member; And A screw rotatably coupled to the bracket and threadedly engaged with the slider, the screw being adapted to cause the slider to translate relative to the bracket when the screw rotates; Wherein the adjustment mechanism is configured to change an angle between the energy storage member and the arm when the slider translates relative to the bracket.

6. A lifting system for raising and lowering a work surface, the lifting system comprising: A work surface having a lower side; A balance mechanism coupled to the lower side; And One or more leg assemblies removably coupled to the lower side and operably coupled to the balance mechanism; Wherein the one or more leg assemblies are configured to translate the work surface between a high position and a low position, Wherein, the one or more leg assemblies are configured to enable the balance mechanism when the work surface is translated, and wherein, the balance mechanism is adapted to provide lift assistance by counteracting the weight of the work surface when the work surface is translated between the high position and the low position.

7. The freestanding workstation according to claim 6, further comprising a frame coupled to the lower side portion; Among them, the one or more leg assemblies are removably coupled to the frame, wherein, the balance mechanism is coupled to the frame.

8. The lifting system according to claim 6, wherein the one or more leg assemblies include: a first member coupled to the lower side portion; a second member slidably engaged with the first member at a first end and coupled to a foot at a second end opposite the first end; wherein, the foot is adapted to be placed on a structure, and wherein, the first member is configured to translate relative to the second member to provide height adjustment for the work surface.

9. The lifting system according to claim 6, wherein the one or more leg assemblies include: a first member coupled to the lower side portion; a second member slidably engaged with the first member; and a third member slidably engaged with the second member at a first end and coupled to a foot at a second end opposite the first end; wherein, the foot is adapted to be placed on a structure, and wherein, the first member and the second member are configured to translate relative to the third member to provide height adjustment for the work surface.

10. The lifting system according to claim 8 or 9, further comprising a drive pulley assembly, the drive pulley assembly including: one or more bushings coupled to the lower side portion; a rod extending between a first rod end and a second rod end, the rod being coupled to the one or more leg assemblies at the first rod end and the second rod end and rotatably coupled to the one or more bushings between the first rod end and the second rod end; and a wheel coupled to the rod between the first rod end and the second rod end; wherein, the drive pulley assembly is removably coupled to the one or more leg assemblies and operably coupled to the balance mechanism, wherein, translation of the work surface is adapted to rotate the rod relative to the work surface, and wherein, rotation of the rod is configured to enable the balance mechanism.

11. The lifting system according to claim 10, wherein the rod includes keys formed on the first rod end and the second rod end, Among them, the keys being formed in a shape selected from the group including: star-shaped, oval, square, rectangular, hexagonal, triangular, and polygonal.

12. The lifting system according to claim 10, wherein the balance mechanism includes: an arm rotatably coupled to the lower side portion; A first adjustment mechanism, the first adjustment mechanism being coupled to the lower side portion; and A first energy storage member, the first energy storage member being coupled between the arm and the first adjustment mechanism, the first energy storage member being configured to bias the arm to rotate in a first direction; wherein the first adjustment mechanism is configured to change an aspect of the first energy storage member.

13. The lifting system according to claim 12, wherein the first adjustment mechanism comprises: A bracket, the bracket being coupled to the lower side portion; A slider, the slider being movably coupled to the bracket; and A screw, the screw being rotatably coupled to the bracket and threadedly engaged with the slider; wherein the first energy storage member is rotatably coupled to the slider, wherein the screw is adapted to translate the slider relative to the bracket when the screw rotates, and wherein the first adjustment mechanism is configured to change an angle between the first energy storage member and the arm when the slider translates relative to the bracket.

14. The lifting system according to claim 13, further comprising: An idler pulley, the idler pulley being coupled to the arm; One or more redirecting pulleys, the one or more redirecting pulleys being coupled to the lower side portion; and A rope, the rope having a first end and a second end; wherein the rope is coupled to the lower side portion at the first end and coupled to the pulley at the second end, wherein the rope is routed around the idler pulley and the one or more redirecting pulleys between the first end and the second end, and wherein the rope is configured to cause the arm to rotate in a second direction opposite to the first direction when the work surface translates from the high position towards the low position.

15. The lifting system according to claim 11, wherein the one or more leg assemblies include a drive assembly; the drive assembly comprises: A first sprocket, the first sprocket being rotatably coupled to the first member near the lower side portion, the first sprocket having an aperture formed in a shape matching the shape of the key formed on the first rod end and the second rod end; A second sprocket, the second sprocket being rotatably coupled to the first member near the second member away from the first sprocket; A first tension member, the first tension member being coupled to the first sprocket and the second sprocket, the first tension member forming a loop around the first sprocket and the second sprocket, and the first tension member being keyed to the first sprocket and the second sprocket to synchronize rotation of the first sprocket with rotation of the second sprocket; and A first rod, the first rod being coupled to the second member at one end and coupled to the first tension member at the other end; wherein the drive assembly is at least partially received inside the first member, and a portion of the drive assembly is configured to translate with the first member, Wherein, the first sprocket and the second sprocket are configured to rotate in response to height adjustment of one or more leg assemblies, and wherein, the aperture is adapted to receive the key located on the first rod end or the second rod end, and wherein, the first sprocket is adapted to rotate the rod in response to height adjustment of the one or more leg assemblies.

16. The lifting system according to claim 9, wherein the one or more leg assemblies further include a synchronizer assembly; the synchronizer assembly includes: A second rod extending from a first end to a second end, the first end of the second rod being coupled to the second member, and the second end of the second rod being located inside the first member; A third rod extending from a first end to a second end, the first end of the third rod being coupled to the third member, and the second end of the third rod being located inside the second member; A third sprocket rotatably coupled to the second rod near the second end of the second rod, A fourth sprocket rotatably coupled to the second rod near the first end of the second rod; And A second tension member coupled to the third sprocket and the fourth sprocket, the second tension member forming a loop around the third sprocket and the fourth sprocket, the second tension member being keyed to the third sprocket and the fourth sprocket to synchronize rotation of the third sprocket with rotation of the fourth sprocket, the second tension member also being coupled to the third rod near the second end of the third rod and coupled to the first member; wherein, the synchronizer assembly is at least partially received inside the second member, and a portion of the synchronizer assembly is configured to translate with the second member, and wherein, the synchronizer assembly is configured to synchronize movement between the first member and the second member and movement between the second member and the third member.

17. The lifting system according to claim 12, wherein the balancing mechanism further comprises a booster assembly coupled between the lower side portion and the arm, wherein, The booster assembly is configured to be selectively actuated to bias the arm in the first direction.

18. The lifting system according to claim 17, wherein the booster assembly includes: A first spring plate rotatably coupled to the arm; A second spring plate having a threaded hole near the center of the second spring plate; A second energy storage member coupled between the first spring plate and the second spring plate; And A screw rotatably coupled to the lower side and threadedly engaged with the second spring plate at the threaded hole; wherein, the screw is adapted to translate the second spring plate along the screw axis to adjust the tension of the second energy storage member.

19. The lifting system according to claim 17, wherein the booster assembly includes: A first tube having a first end and a second end coupled to a first ring, the first tube being rotatably coupled to the lower side at the first ring; A second tube, the second tube being slidably engaged with the first tube, the second tube having a first end portion and a second end portion located inside the first tube; A rod, the rod being slidably engaged with the first tube, the rod having a first end portion and a second end portion located inside the second tube; the rod includes: A first support member, the first support member being coupled to the first end portion of the rod; A second support member, the second support member being coupled near the second end portion of the rod; and A second ring, the second ring being coupled to the second end portion of the rod, the rod being rotatably coupled to the arm at the second ring; A second energy storage member, the second energy storage member being coupled between the first support member and the second end portion of the second tube, the second energy storage member being compressed between the first support member and the second end portion of the second tube to bias the second tube toward the second support member; and A fastener, the fastener being selectively couplable between the first tube and the second tube, the booster assembly being enabled when the fastener is engaged with both the first tube and the second tube and being disabled when the fastener is disengaged from one or both of the first tube and the second tube; wherein the booster assembly is configured to bias the arm to rotate in the first direction when the booster assembly is enabled.

20. The lifting system according to claim 6 further includes a main bracket coupled to the lower side portion, wherein, The balance mechanism is coupled to the main bracket.

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