Height adjustable work surface and control therefor
First Claim
1. 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 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 first powered drive assembly further including a first drive screw and a first cantilever assembly horizontally offset from said first drive screw and operatively connected thereto, such that said first dive screw raises and lowers said first cantilever assembly to correspondingly raise and lower said work surface;
a second powered drive assembly including a second electric motor drivingly engaged with said top assembly at another location for effecting vertical movement of said top assembly to adjust the height of the work surface, said second powered drive assembly including a second drive screw and a second cantilever assembly horizontally offset from said second drive screw and operatively connected thereto, such that said second drive screw raises and lowers said second cantilever assembly to correspondingly raise and lower said work surface, wherein the horizontal offset of said first and second cantilever assemblies relative to the first and second drive screws resists back drive of the first and second drive screws when load is applied to the work surface; and
a controller coupled to said first and second drive assemblies for simultaneously controlling said first and second motors.
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Accused Products
Abstract
A motorized height adjustable table having a support base, a top assembly including a substantially horizontally disposed work surface, and first and second powered drive assemblies for raising and lowering the work surface. The first and second drive assemblies have first and second electric motors and drivingly engage the top assembly for effecting vertical movement of the top assembly to adjust the height of the work surface. A controller is coupled to the first and second drive assemblies for simultaneously controlling the first and second electric motors. The controller senses a relative height displacement between the first and second drive assemblies and de-energizes the motor controlling for the leading drive assembly until the relative difference in height between the first and second drive assemblies is substantially zero.
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Citations
27 Claims
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1. A motorized height adjustable table comprising:
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a support base;
a top assembly including a substantially horizontally disposed work surface;
a first powered drive assembly including a first 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 first powered drive assembly further including a first drive screw and a first cantilever assembly horizontally offset from said first drive screw and operatively connected thereto, such that said first dive screw raises and lowers said first cantilever assembly to correspondingly raise and lower said work surface;
a second powered drive assembly including a second electric motor drivingly engaged with said top assembly at another location for effecting vertical movement of said top assembly to adjust the height of the work surface, said second powered drive assembly including a second drive screw and a second cantilever assembly horizontally offset from said second drive screw and operatively connected thereto, such that said second drive screw raises and lowers said second cantilever assembly to correspondingly raise and lower said work surface, wherein the horizontal offset of said first and second cantilever assemblies relative to the first and second drive screws resists back drive of the first and second drive screws when load is applied to the work surface; and
a controller coupled to said first and second drive assemblies for simultaneously controlling said first and second motors. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A motorized height adjustable table comprising:
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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. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 18, 19)
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15. A motorized height adjustable table comprising:
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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. - View Dependent Claims (16, 17)
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20. A motorized height adjustable table comprising:
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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. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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Specification