Automated height adjustable work station

• US 5,259,326 A
• Filed: 04/17/1991
• Issued: 11/09/1993
• Est. Priority Date: 04/17/1991
• Status: Expired due to Fees

• Current Assignee: Haworth Incorporated
• Original Assignee: Haworth Incorporated
• Inventors: Flower, Daniel L., Pattok, Greg R., Graham, Donald W., Pierce, Paul M., Borgman, Randall W., Cleair, William L., Alexander, Brian D. T., Osterman, Thomas J., Rosendahl, Raymond D.
• Primary Examiner(s): Chen, Jose V.
• Application Number:
  US07/686,660
• Time in Patent Office: 937 Days
• Field of Search: 108/147, 108/50, 108/20, 108/21, 108/22
• US Class Current: 108/147
• CPC Class Codes: A47B 2200/0027 Desks with I-shaped leg
• CPC Class Codes: A47B 2200/0046 Desks with double worktop of which one at least is separately height adjustable
• CPC Class Codes: A47B 9/00 Tables with tops of variable height lecterns with variable height A47B19/06; school forms or desks with variable height A47B39/02, A47B41/02; seats with variable height A47C3/20

Abstract

A work station, particularly for supporting a computer, having separate front and back tops having separate powered drive arrangements for permitting independently height adjustment. The drive arrangement includes a separate drive motor associated with each top, with the motors being controlled by a controller, such as a microprocessor. The controller is preferably controlled by an operator using a portable keypad control which can be positioned on one of the tops. The controller can be programmed by the operator to permit storage of a number of predetermined height locations each defining distinct heights for both tops.

Claims

1. In a table having a horizontally enlarged top defining thereon a horizontally enlarged and upwardly facing worksurface, a pair of vertically elongate leg assemblies connected to said top at sidewardly spaced locations and projecting downwardly therefrom for supporting the top at selected heights above a support surface, each said leg assembly including a top leg fixed to and projecting downwardly from the top and being vertically slidable supported on a lower leg for permitting adjustment in the height of the top, and a powered drive arrangement mounted on the table and drivingly coupled to said pair of leg assemblies for permitting powered vertical displacement of said top legs to adjust the height of said top, comprising the improvement wherein:

said drive arrangement includes a pair of powered drive means each associated with a respective one of said leg assemblies for effecting powered vertical displacement of the top leg of the respective leg assembly, each said drive means including a low-voltage direct current electric motor and a rotary-to-linear motion converter means for effecting vertical extension and contraction of a respective said leg assembly, the rotary-to-linear motion converter means including a rotary input member which is drivingly coupled to the respective electric motor and a linearly-movable output member which is coupled to one of the legs of the respective leg assembly, the rotary-to-linear motion converter associated with each said leg assembly being free of mechanical driving connection with the motion converter of the other said leg assembly, said pair of powered drive means being operatively coupled together solely by electrical cable means for transmitting electrical energy between said motors; and

controller means operatively coupled with the pair of drive means for simultaneously controlling the rotation of the motors of said pair of drive means for synchronizing the extension and contraction of said pair of leg assemblies, said controller means includes means for sensing when one said motor is rotating faster than the other said motor and for slowing the rotation of the faster-running motor so that it substantially equals the rotation of the slower-running motor.

2. A table according to claim 1, including portable pendant-type keypad control means removably positioned on said top for activating said controller means.

3. A table, particularly adapted for supporting a computer, comprising:

a base adapted for deposition on a support surface such as a floor, said base having a pair of horizontally-spaced upright pedestals;

a front top assembly including a horizontally enlarged worksurface-defining front top having a pair of sidewardly spaced and generally parallel elongate legs fixed to said top and projecting downwardly therefrom in cantilevered relationship, each of said legs being vertically slidably supported on a respective one of said pedestals;

a rear top assembly including a horizontally enlarged worksurface-defining rear top having a pair of sidewardly spaced and generally parallel elongate legs fixed to said top and projecting downwardly therefrom in cantilevered relationship, each of said legs being vertically slidably supported on a respective one of said pedestals;

a powered drive arrangement including front and rear lifting means respectively coacting with sad front and rear top assemblies for effecting vertical movement thereof to adjust the height of the respective front and rear tops;

controller means operatively coupled to said powered drive arrangement for controlling activation of said front and rear lifting means including programming means for permitting storage of predetermined height locations each representing front and rear height values corresponding to predetermined heights of the respective front and rear tops, and means for automatically activating said front and rear lifting means to respectively move said front and rear tops to heights defined by a preselected said height location;

said controller means including timing means for defining a predetermined time interval corresponding to said preselected height location for maintaining said front and rear tops at said heights for said time interval; and

operator-activated control means for permitting operator selection of said preselected height location and initiation of said activating means.

4. A table according to claim 3, wherein said controller means includes sequencing means for defining a series of table events wherein each said table event defines a distinct stored predetermined height location and a distinct defined time interval, and said activating means including means for causing automatic activation of said series of table events only upon receipt of a signal from said operator-activated control means so as to permit activation of the next event.

5. In an adjustable work station defining separately movable front and rear height-adjustable support surfaces which are respectively adapted to support thereon a keyboard and an associated information display screen, and drive means cooperable with said support surfaces for adjusting them to a desired relative height arrangement wherein said front support surface is disposed at a first height and said rear support surface is disposed at a second height, said first and second heights defining a height value pair, the improvement comprising:

height determination means for determining first and second height values which respectively correspond to the first and second heights at which said front and rear support surfaces are currently disposed;

storage means for uniquely identifying and storing a plurality of said height value paris which correspond to various possible relative height arrangements of said front and rear support surfaces;

display means operatively coupled to said storage means and responsive to a predetermined user input for retrieving a selected one of said height value pairs from said storage means and producing a visual display of said selected height value pair; and

adjustment means operatively coupled to said drive means and responsive to a predetermined user input for automatically adjusting said front and rear support surfaces to a relative height arrangement wherein said support surfaces are disposed at the respective heights represented by the corresponding height values of the selected height value pair.

6. A work station according to claim 5, wherein said adjustment means, in response to said predetermined user input, includes means for first vertically moving said rear support surface to the height corresponding to the rear height value of the selected height value pair, and for then automatically thereafter moving the front rear surface to the height corresponding to the front height value of the selected height value pair.

7. A work station according to claim 6, wherein said drive means includes rotatable electric motor means for driving rotatable output members, and said height determination means includes means for sensing and counting the rotations of said rotatable output members so as to determine said height values.

8. A work station according to claim 6, wherein said adjustment means includes means for admitting a visual and/or audible warning after receipt of said predetermined user input but prior to initiation of the movement of rear support surface, and said means also emitting a visual and/or audible warning after said rear support surface has reached its respective height but prior to initiating the movement of the front support surface.

9. A work station according to claim 5, including:

timer means for measuring elapsed time and indicating that a predetermined amount of time has elapsed;

sequencing means for storing a defined sequence of work station events with each event being defined by one of the previously stored height value pairs in combination with a selected time interval; and

said adjustment means including means for automatically adjusting said front and rear support surfaces sequentially according to the height values and time intervals defined by the sequential events stored in the sequencing means in response to a predetermined user input prior to initiation of each said event.

10. A work station according to claim 9, wherein said adjustment means includes means for emitting a visual and/or audible warning after receipt of said predetermined user input but prior to initiation of the movement of the rear support surface, and said means also emitting a visual and/or audible warning after said rear support surface has reached its respective height but prior to initiating the movement of the front support surface.

11. A work station according to claim 5, including right and left telescopically extendible and contractible leg assemblies connected to and projecting downwardly from each of said support surfaces, said drive means including separate right and left drives respectively associated with each of said right and left leg assemblies for controlling vertical extension and contraction thereof to adjust the height of the respective support surface, each said right and left drive respectively including right and left electric motors, and control means for causing synchronous rotation of the right and left motors associated with the respective support surface and for automatically adjusting one of said motors relative to the other to substantially equalize vertical displacement of the right and left leg assemblies of the respective support surface.

12. A work station according to claim 11, wherein the drive means includes a rotatable output member associated with each said support surface, the height determination means including means for sensing and counting the rotations of the rotatable output members so as to determine the height values, and the control means includes means for sensing when one of the right and left motors is rotating faster than the other of said right and left motors and for adjusting the speed of at least one of the motors so as to substantially equalize the rotation of the right and left motors.

13. A table, particularly adapted for supporting a computer, comprising:

a base adapted for deposition on a support surface such as a floor, said base having a pair of horizontally-spaced upright pedestals;

a front top assembly including a horizontally enlarged worksurface-defining front top having a pair of sidewardly spaced and generally parallel elongate legs fixed to said top and projecting downwardly therefrom in cantilevered relationship, each of said legs being vertically slidably supported on a respective one of said pedestals;

a rear top assembly including a horizontally enlarged worksurface-defining rear top having a pair of sidewardly spaced and generally parallel elongate legs fixed to said top and projecting downwardly therefrom in cantilevered relationship, each of said legs being vertically slidably supported on a respective one of said pedestals;

a powered drive arrangement including front and rear lifting means respectively coacting with said front and rear top assemblies for effecting vertical movement thereof to adjust the height of the respective front and rear tops;

said lifting means as respectively associated with each said top assembly including a pair of powered drive means each associated with a respective one of the legs, each said drive means including a low-voltage direct current electric motor drivingly coupled to a rotary input of a rotary-to-linear motion converter means having a linearly-movable output coupled to the respective leg for effecting vertical raising and lowering of the leg;

controller means operatively coupled to said powered drive arrangement for controlling activation of said front and rear lifting means including programming means for permitting storage of predetermined height locations each representing front and rear height values corresponding to predetermined heights of the respective front and rear tops, and activating means for automatically activating said front and rear lifting means to respectively move said front and rear tops to heights defined by a preselected said height location;

said controller means also including means for simultaneously controlling the rotation of the motors of said pair of drive means associated with one of said top assemblies for synchronizing the vertical raising and lowering of the pair of legs; and

operator-activated control means for permitting operator selection of said preselected height location and initiation of said activating means.

14. A table according to claim 13, wherein said controller means includes means for sensing when one said motor of said pair of drive means is rotating faster than the other said motor and for slowing the rotation of the faster-running motor so that it substantially equals the rotation of the slower-running motor.

15. A table according to claim 14, wherein each said controller means includes means for sensing and counting the rotation of rotatable output members associated with the pair of motors so as to determine a height value for the top assembly, and display means for visually displaying the height of the top assembly.

16. A table, particularly adapted for supporting a computer, comprising:

a base adapted for deposition on a support surface such as a floor, said base having a pair of horizontally-spaced upright pedestals;

a front top assembly including a horizontally enlarged worksurface-defining front top having a pair of sidewardly spaced and generally parallel elongate legs fixed to said top and projecting downwardly therefrom in cantilevered relationship, each of said legs being vertically slidably supported on a respective one of said pedestals;

a rear top assembly including a horizontally enlarged worksurface-defining rear top having a pair of sidewardly spaced and generally parallel elongate legs fixed to said top and projecting downwardly therefrom in cantilevered relationship, each of said legs being vertically slidably supported on a respective one of said pedestals;

a powered drive arrangement including front and rear lifting means respectively coacting with said front and rear top assemblies for effecting vertical movement thereof to adjust the height of the respective front and rear tops;

controller means operatively coupled to said powered drive arrangement for controlling activation of said front and rear lifting means including programming means for permitting storage of predetermined height locations each representing front and rear height values corresponding to predetermined heights of the respective front and rear tops, and activating means for automatically activating said front and rear lifting means to respectively move said front and rear tops to heights defined by a preselected said height location, said activating means including means sequentially activating first said rear top and then said front top; and

operator-activated control means for permitting operator selection of said preselected height location and initiation of said activating means.