Height adjustable work surface and control therefor

A motorized height adjustable table comprising:

• a support base;
• a top assembly including a substantially horizontally disposed work surface;
• a first powered drive assembly including a first electric motor and first drive arm engaged with said top assembly at one location for effecting vertical movement of said top assembly to adjust the height of the work surface;
• a second powered dive assembly including a second electric motor and second drive arm engaged with said top assembly at another location for effecting vertical movement of the top assembly to adjust the height of the work surface;
• and
• a controller coupled to said first and second drive assemblies for simultaneously controlling said first and second motors to move said first and second drive arms, said controller sensing displacement of each of said first and second drive arms and determining a rate of displacement over a period of time for each of said first and second drive arms, said controller de-energizing said first and second motors as a function of said rate of displacement when said rate of displacement is indicative of one of a travel limit and an overload condition.

A motorized height adjustable table comprising:

• a support base;
• a top assembly including a substantially horizontally disposed work surface;
• a powered drive assembly including an electric motor drivingly engaged with said top assembly at one location for effecting vertical movement of said top assembly to adjust the height of the work surface, said powered drive assembly further including a drive screw and a cantilever assembly horizontally offset from said drive screw and operatively connected thereto, such that said drive screw raises and lowers said cantilever assembly to correspondingly raise and lower said work surface, wherein the horizontal offset of said cantilever assembly relative to the drive screw resists back drive of the drive screw when load is applied to the work surface;
• and
• a controller coupled to said drive assembly for simultaneously controlling said motor.

A motorized height adjustable table comprising:

• a support base;
• a top assembly including a substantially horizontally disposed work surface;
• a powered drive assembly including an electric motor and drive arm engaged with said top assembly at one location for effecting vertical movement of said top assembly to adjust the height of the work surface;
• and
• a controller coupled to said drive assembly for controlling said motor to move said drive arm, said controller sensing displacement of said drive arm and determining a rate of displacement over a period of time for said drive arm, said controller de-energizing said motor as a function of said rate of displacement when said rate of displacement is indicative of one of a travel limit and an overload condition.