Horizontally supported planar surfaces – Vertically adjustable – Shelf type
Patent
1997-07-24
1998-12-08
Chen, Jose V.
Horizontally supported planar surfaces
Vertically adjustable
Shelf type
10814411, A47B 900
Patent
active
058455906
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
This invention relates to a table assembly in which the table top is movable to varying elevations above a supporting surface such as a floor.
It is known to construct a table in such a manner that the table top is movable to varying elevations above a supporting surface such as floor. Tables of this type conventionally include a table top and a base assembly having a lower stationary portion engageable with the floor and an upper portion, to which the table top is secured, movably mounted to the stationary lower portion. An adjustment mechanism is provided for fixing the position of the upper portion of the base relative to the lower portion, for adjusting the height of the table relative to the floor. Many types of adjustment mechanisms are known for adjusting the vertical position of the upper base portion relative to the lower base portion.
It is an object of the present invention to provide an improved adjustable height table assembly in which the upper base portion is movably secured to the lower base portion so as to provide an extremely stable support for the table top, even when the table top is in its uppermost position above the floor. It is a further object of the invention to provide a compact and easily assembled arrangement for movably mounting the base upper portion to the lower portion, while maintaining a smooth and stable arrangement. Yet another object of the invention is to provide an operating mechanism for turning a rotatable threaded member forming a part of the height adjustment mechanism, in which the operating mechanism can be placed in most any location on the table top.
In accordance with one aspect of the invention, a table assembly includes a table top and a pair of spaced base assemblies, each of which includes a foot engageable with a supporting surface such as the floor, extending in a front-rear direction. Each base further includes a pair of vertical guide members spaced from each other in the front-rear direction, and a bearing or slide assembly is slidably mounted to the guide members. A table top support forms the movable upper portion of the base to which the table top is mounted, and includes a vertical leg member fixedly mounted to the bearing assembly. The base assembly includes a housing mounted to the foot member and extending upwardly therefrom. The housing encloses the vertical guide members and the bearing assembly, and the vertical member of the table top support extends outwardly from an upper end defined by the housing.
A vertical adjustment: mechanism is interconnected between the base and the table top support, for adjusting the vertical position of the table top relative to the floor. The vertical adjustment mechanism includes a rotatable threaded member, such as a lead screw, extending through a passage defined by the vertical leg member of the table top support. A tubular member is mounted within the housing between the vertical guide members, and receives the lower portion of the lead screw. A fixed threaded member, such as a lead nut, is mounted toward the upper end of the tubular member and is threadedly engaged with the threads of the lead screw.
The table top support further includes an arm to which the table top is secured. The arm defines an axial passage, which is in communication with the passage formed in the vertical leg member through which the lead screw extends. A driven sprocket is mounted to the lead screw toward its upper end, and a drive sprocket is rotatably mounted to the arm below the table top. A chain is engaged with the drive sprocket and with the driven sprocket, and a manually operable crank provides rotation of the drive sprocket, which is transferred through the chain and the driven sprocket to impart rotation to the lead screw and to thereby adjust the height of the table top.
The base housing is preferably formed so as to include an upper wall and a lower wall, with upper and lower ends of the vertical guide members being secured to the upper and lower walls, respectively. The tubu
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Chen José V.
Krueger International Inc.
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