A height adjustment device used on furniture includes an inner tube having multiple clamp portions and multiple contact portions extending from the inner periphery thereof. Multiple grooves are defined in the outer periphery of the inner tube. A pneumatic tube is inserted into the inner tube and clamped by the contact portions. The inner tube is located in an outer tube that has a bottom cap and a top cap. Multiple ridges extend from the inner periphery of the outer tube. Each reduced opening accommodates the ridge corresponding thereto. The pneumatic tube has a piston rod and is connected to the bottom cap of the outer tube. The piston rod drives the inner tube to move relative to the outer tube. Multiple roller units are connected to ridges and roll the grooves of the inner tube to reduce friction between the inner tube and the outer tube.

A height adjustment device used on furniture includes an inner tube having multiple clamp portions and multiple contact portions extending from the inner periphery thereof. Multiple grooves are defined in the outer periphery of the inner tube. A pneumatic tube is inserted into the inner tube and clamped by the contact portions. The inner tube is located in an outer tube that has a bottom cap and a top cap. Multiple ridges extend from the inner periphery of the outer tube. Each reduced opening accommodates the ridge corresponding thereto. The pneumatic tube has a piston rod and is connected to the bottom cap of the outer tube. The piston rod drives the inner tube to move relative to the outer tube. Multiple roller units are connected to ridges and roll the grooves of the inner tube to reduce friction between the inner tube and the outer tube.

An apparatus and method for automatically adjusting and monitoring use of an adjustable standing desk are disclosed. The invention provides an electric adjustable desk with memory to store a user's preferred sitting and standing heights for the adjustable desk. A setup mode allows the user to store and adjust the preferred sitting and standing heights. A sensor allows the user to quickly adjust from the sitting to standing heights or vice versa.

An apparatus and method for automatically adjusting and monitoring use of an adjustable standing desk are disclosed. The invention provides an electric adjustable desk with memory to store a user's preferred sitting and standing heights for the adjustable desk. A setup mode allows the user to store and adjust the preferred sitting and standing heights. A sensor allows the user to quickly adjust from the sitting to standing heights or vice versa.

A height-adjustable desk includes a base, a top board, a link mechanism, a height-adjusting member, and an operating member. The top board is configured to be vertically elevated with respect to the base. The link mechanism is disposed between the base and the top board so as to support the top board such that the top board may be elevated, the link mechanism including a plurality of link members. The height-adjusting member is formed to be extendable at a desired length and determining a height of the top board with respect to the base according to a length thereof. The operating member fixes the height-adjusting member so that the height-adjusting member maintains the desired length.

A height-adjustable desk includes a base, a top board, a link mechanism, a height-adjusting member, and an operating member. The top board is configured to be vertically elevated with respect to the base. The link mechanism is disposed between the base and the top board so as to support the top board such that the top board may be elevated, the link mechanism including a plurality of link members. The height-adjusting member is formed to be extendable at a desired length and determining a height of the top board with respect to the base according to a length thereof. The operating member fixes the height-adjusting member so that the height-adjusting member maintains the desired length.

A table arrangement includes connection mechanisms for inter-connection of height adjustable tabletops so that the tabletops are independently moveable in a stable way. Embodiments of the table arrangement can be configured so that different height adjustable tabletops can be arranged to accommodate different users' preferences. Some embodiments of the table arrangement can utilize at least one cross-member connection mechanism connected to at least one column connection mechanisms 20.

A computer workstation lift and tilt assembly for providing a stable platform to raise, lower, and tilt various computing device. Here, the assembly can include a base, a first column, wherein the first column is secured to the base, and a second column. The assembly can further include a mount, wherein the mount is secured to a top region of the second column and configured to pivot relative to the second column, a first main slide having a first sub slide, and a second main slide having a second sub slide. Here, the first main slide can be secured to one side of the first column and the second main slide is secured to an opposing side of the first column, wherein the first sub slide is secured to one side of the second column and the second sub slide is secured to an opposing side of the second column, and wherein the second column is adapted slide relative to the first column.

A computer workstation lift and tilt assembly for providing a stable platform to raise, lower, and tilt various computing device. Here, the assembly can include a base, a first column, wherein the first column is secured to the base, and a second column. The assembly can further include a mount, wherein the mount is secured to a top region of the second column and configured to pivot relative to the second column, a first main slide having a first sub slide, and a second main slide having a second sub slide. Here, the first main slide can be secured to one side of the first column and the second main slide is secured to an opposing side of the first column, wherein the first sub slide is secured to one side of the second column and the second sub slide is secured to an opposing side of the second column, and wherein the second column is adapted slide relative to the first column.

A supporter for a woodworking table contains: four supporting rods, four driving columns, and two movable adjustment posts. Two middle sections of two of the four driving columns are rotatably connected with two middle sections of the other two of the four driving columns respectively, and one side of each of the four supporting rods is in connection with each of two ends of each driving column. The two movable adjustment posts parallelly correspond to each other, and each end of each of the two movable adjustment posts is rotatably connected with a middle section of each supporting rod. Each movable adjustment post includes an outer tube, an inner tube, and an adjustable stem. Thereby, the supporter of the present invention is collapsible so as to decrease its storage size. The supporter adjustably supports the table board based on a size of the table board.