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US 5,685,510 AGranted
Height adjustment system for a desk or workstation
AssigneePrima Furniture (Aust) Pty Ltd
InventorRoger Graham Frankish
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AssigneePrima Furniture (Aust) Pty Ltd
InventorRoger Graham Frankish
Estimating the term…
A height adjustment system for a desk, workstation or the like is provided comprising a plurality of height adjustable legs each having a first part in the form of a hollow column and a second part movable relative to the first part in a vertical direction. The second part of each leg includes a gearbox housing containing a crown gear provided on a vertically extending rotatable shaft and at least one pinion gear engageable with said crown gear. The vertical shaft includes a screw-threaded portion engaged by nuts on a base plate of the column. A winding mechanism is provided for rotating a horizontally extending shaft on which the pinion gear is provided. Rotation of the horizontal shaft causes the vertical shaft to rotate thereby moving the second part relative to the column so adjust the height of a top member secured on the gearbox housing. The gearbox housing includes ball bearing race assemblies for the crown and pinion gears which enable the height or two or more legs to be adjusted simultaneously by a single winding mechanism. The leg also includes a self-adjusting linear bearing between telescopically movable parts of the leg.
A height adjustment system for a desk or workstation comprising a top member and a plurality of height adjustable legs, each leg comprising a first leg part adapted to stand on a floor surface, and a second leg part adapted to be fixed to said top member, said second leg part being movable relative to said first leg part in a substantially vertical direction, said second leg part including a gearbox housing containing a crown gear rotatable about a substantially vertical axis and at least one pinion gear engageable with said crown gear and a rotatable about a substantially horizontal axis, said gearbox housing containing at least one ball bearing race assembly provided between said gearbox housing and at least one of said gears,
A height adjustable leg for a desk or workstation, the leg comprising a first leg part adapted to stand on a floor surface, and a second leg part adapted to be fixed to a top member of said desk or workstation, said second leg part being movable relative to said first leg part in a substantially vertical direction, said second leg part including a gearbox housing containing a crown gear rotatable about a substantially vertical axis and at least one pinion gear engageable with said crown gear about a substantially horizontal axis, said gearbox housing containing at least one ball bearing race assembly provided between said gearbox housing and at least one of said gears, wherein the second leg part includes a generally vertically extending rotatable shaft on which said crown gear is mounted, said rotatable shaft having a screw-threaded portion, and said first leg part includes a nut engaged with said screw-threaded portion, whereby rotation of said crown gear causes said second leg part to move substantially vertically relative to said first leg part, and wherein said crown gear is of hollow form having a bevel gear portion, an upper shaft portion extending upwardly from said bevel gear portion and a bore adapted to receive the upper end of said rotatable shaft for mounting said crown gear on said rotatable shaft.
A height adjustable leg for a desk or workstation, the leg comprising a first leg part adapted to stand on a floor surface, and a second leg part adapted to be fixed to a top member of said desk or workstation, said second leg part being movable relative to said first leg part in a substantially vertical direction, said second leg part including a gearbox housing containing a crown gear rotatable about a substantially vertical axis and at least one pinion gear engageable with said crown gear and rotatable about a substantially horizontal axis, said gearbox housing containing at least one ball bearing race assembly provided between said gearbox housing and at least one of said gears, wherein said at least one pinion gear is provided on a generally horizontally extending rotatable shaft adapted to be connected to drive means for rotating said rotatable shaft, and said pinion gear comprises a bevel gear portion and a spigot portion for mounting said pinion gear on said rotatable shaft, said pinion gear ball bearing race assembly comprising a first bearing race member mounted on said spigot portion of said pinion gear and having a substantially part-spherical concave bearing surface, a second bearing race member having a substantially part-spherical concave bearing surface, and a plurality of ball bearings received between said part-spherical concave bearing surfaces, and wherein said gearbox housing includes a housing base member, a gearbox cover member and a pinion gear ball bearing race assembly, and said bearing race member is located in position by being partly received in a recess in said housing base member and partly received in a recess in said gearbox cover member.
A height adjustable leg for a desk or workstation, the leg comprising a first leg part adapted to stand on a floor surface, and a second leg part adapted to be fixed to a top member of said desk or workstation, said second leg part being movable relative to said first leg part in a substantially vertical direction, said second leg part including a gearbox housing containing a crown gear rotatable about a substantially vertical axis and at least one pinion gear engageable with said crown gear and rotatable about a substantially horizontal axis, said gearbox housing containing at least one ball bearing race assembly provided between said gearbox housing and at least one of said gears, wherein the second leg part includes a generally vertically extending rotatable shaft on which said crown gear is mounted, said rotatable shaft having a screw-threaded portion, and said first leg part includes a nut engaged with said screw-threaded portion, whereby rotation of said crown gear causes said second leg part to move substantially vertically relative to said first leg part, and
A height adjustable leg for a desk or workstation, the leg comprising a first leg part adapted to stand on a floor, and a second leg part adapted to be fixed to a top member of said desk or workstation, said second leg part being movable relative to said first leg part in a substantially vertical direction, said second leg part including a gearbox housing containing a crown gear rotatable about a substantially vertical axis and at least one pinion gear engageable with said crown gear and rotatable about a substantially horizontal axis, said gearbox housing containing at least one ball bearing race assembly provided between said gearbox housing and at least one of said gears, wherein said first leg part includes a vertically extending column, said second leg part includes a vertically extending member within said column, and further comprising at least one adjustable linear bearing provided between said column and said vertically extending member.
A height adjustable leg for a desk or workstation, said leg comprising:
An adjustable linear bearing for a height adjustable leg having first and second parts which are movable relative to each other in a linear direction,
Dependencies are inferred from the claim text.