Disclosed are control mechanisms, frames and tables. A slider includes a sleeve, a pivoting portion and a controller. The sleeve is configured to slidably couple with a first bar, and a first hole and a pillar are formed at a first side wall of the sleeve. The pivoting portion is integrally formed or coupled with the first side wall of the sleeve, and configured to pivotally couple with a second bar. The controller is disposed side by side with the pivoting portion along a longitudinal direction of the sleeve, and configured to control movement of the sleeve along the first bar. The controller includes a casing, a lever pivotally connected with the casing, a pin integrally formed or coupled with the lever, and an elastic member selectively pushing the pin into the first hole and a hole of the first bar, thereby restricting movement of the sleeve with respect to the first bar.

A two-stage lock assembly comprising a multi-element lock tab configured for disposition in a lateral structure of a lock device. The multi-element lock tab may include a body that includes an end on which a first element and a second element are disposed. The first element may extend from the body farther than the second element to enable the first element to be introduced into a receiver prior to the second element. The multi-element lock tab may be configurable in a disengaged configuration in which the first element and the second element are not positioned in a receiver, a first engaged configuration in which the first element is positioned in the receiver and the second element is not, and a second engaged configuration in which the first and the second elements are positioned in the receiver.

A two-stage lock assembly comprising a multi-element lock tab configured for disposition in a lateral structure of a lock device. The multi-element lock tab may include a body that includes an end on which a first element and a second element are disposed. The first element may extend from the body farther than the second element to enable the first element to be introduced into a receiver prior to the second element. The multi-element lock tab may be configurable in a disengaged configuration in which the first element and the second element are not positioned in a receiver, a first engaged configuration in which the first element is positioned in the receiver and the second element is not, and a second engaged configuration in which the first and the second elements are positioned in the receiver.

A height-adjustable frame for furniture, such as a worktable or desk, is disclosed. The frame includes first and second height-adjustable leg elements pivotable about first and second pivot axes between folded-out and folded-in positions. A rotatable shaft is arranged between the first and second leg elements to synchronously drive first and second height adjustment arrangements. The shaft includes a middle section and first and second end sections pivotable towards the middle section about respective first and second joint axes. A locking structure is included that locks the first and second leg elements in a folded-out position, when the first and second joint axes do not run approximately parallel to the first and second pivot axes, and that unlocks when the first and second joint axes run approximately parallel to the first and second pivot axes to permit the first and second leg elements to pivot into a folded-in position.

A lifting desktop comprises a desktop platform, a base frame below the desktop platform, and two sets of assemblies. Each set of assemblies include a support frame assembly, an assistance assembly and a locking assembly. The two sets of assemblies are symmetrically arranged on two sides between the base frame and the desktop platform. The base frame comprises lower side-plates, and the desktop platform comprises upper side-plates. Each of the support frame assemblies comprises two support legs which are pivoted to each other in scissors by a central pivot and spanned on two sides of the respective lower side-plate. Each of the support legs has a fixed pivot end pivoted to the respective lower side-plate or upper side-plate and a free end movably connected to the opposite upper side-plate or lower side-plate on the same side.

A height-adjustable frame comprises a first leg element with a first support section, a first foot section and a first adjustment arrangement and a second leg element with a second support section, a second foot section and a second adjustment arrangement. The first support section and the first foot section can be moved relative to each other by means of the first adjustment arrangement. The second support section and the second foot section can be moved relative to each other by means of the second adjustment arrangement. The first leg element can be pivoted about a first pivot axis and the second leg element can be pivoted about a second pivot axis. The frame also has a locking structure and a rotatable shaft arranged between the first leg element and the second leg element to synchronously drive the first adjustment arrangement and the second adjustment arrangement. The shaft comprises a middle section, a first end section pivotable towards the middle section about a first joint axis and a second end section pivotable towards the middle section about a second joint axis. The locking structure locks the first leg element and the second leg element in a folded-out position when the joint axes do not run at least approximately parallel to the pivot axes or, in particular, at least approximately coincide. The locking structure can be unlocked when the joint axes run at least approximately parallel to the pivot axes and, in particular, at least approximately coincide so that the first leg element and the second leg element can be pivoted into a folded-in position.

The present invention discloses a lifting desktop with a compact structure, comprising a desktop platform, a base frame below the desktop platform, and two sets of support frame assemblies, assistance assemblies and locking assemblies which are symmetrically arranged on two sides between the base frame and the desktop platform, wherein the base frame comprises lower side-plates, and the desktop platform comprises upper side-plates; each of the support frame assemblies comprises two support legs which are pivoted to each other in scissors by a central pivot and spanned on two sides of the respective lower side-plate; each of the support legs has a fixed pivot end pivoted to the respective lower side-plate or upper side-plate and a free end movably connected to the opposite upper side-plate or lower side-plate on the same side.

A two-stage lock assembly comprising a multi-element lock tab configured for disposition in a lateral structure of a lock device. The multi-element lock tab may include a body that includes an end on which a first element and a second element are disposed. The first element may extend from the body farther than the second element to enable the first element to be introduced into a receiver prior to the second element. The multi-element lock tab may be configurable in a disengaged configuration in which the first element and the second element are not positioned in a receiver, a first engaged configuration in which the first element is positioned in the receiver and the second element is not, and a second engaged configuration in which the first and the second elements are positioned in the receiver.