Vertically adjustable support for a chair or table

A support for chairs and tables comprising

• a guiding tube (1) adapted to be coupled with a base of a chair or table,
• an adjusting arrangement (10) for adjusting the length of the support, whereby this adjusting arrangement is adapted to be coupled with the table or a seat of the chair,
• a sleeve (20) being a tubular piece (21), said sleeve being inserted in the guiding tube (1) and having a main axis A, whereby the adjusting arrangement (10) goes through said sleeve, and wherein the sleeve has outside ribs (23) and inside ribs (42) which are arranged around the periphery of the tubular piece (21) of the sleeve (20), wherein
• each of said inside ribs has a front face (39),
• a recess (58) is provided in the front face (39) of each inside rib (42) approximately in the middle of the width of said front face (39), said recess having a depth, and each said inside rib has a lip (60) that has an edge (61),
• said recess (58) of each said inside rib (42) has a relatively wide bottom (59) and said lip (60) extends away from said bottom,
• said lip (60) of each said inside rib (42) has a height greater than the depth of the recess (58), and the edge (61) of the lip (60) is averted from the bottom (59) of the recess (58), and protrudes from the recess (58), when the adjusting arrangement (10) is removed from the sleeve (20).

A support adapted for use with chairs or tables, comprising

• a guiding tube (1) adapted to be coupled with a base of a chair or table,
• an adjusting arrangement (10) for adjusting the length of the support, said adjusting arrangement (10) being adapted to be coupled with the table or a seat of the chair,
• a sleeve (20) which is inserted in the guiding tube (1) and has a main axis A, said sleeve having a tubular piece (21), wherein the adjusting arrangement (10) goes through said sleeve, and the sleeve has outside ribs (23) and inside ribs (42) which are arranged around the peripheral circular length of the tubular piece (21) of the sleeve (20), wherein
• each said inside rib (42) has a flexible main body (65) which can be bent to one side to have the shape essentially of a convex arch,
• the inside of said arch is turned away from the main axis A,
• the main body (65) of each said inside rib (42) has a substantially rectangularly shaped cross-section with two shorter sides,
• one of the shorter sides of said cross-section adjoins the inside surface (24) of the tubular piece (21), and
• said one of the shorter sides is in one piece with the tubular piece (21) and said rib (42) extends along the tubular piece (21).

A support, suitable for chairs or tables, comprising:

• a guiding tube (1) for coupling with a base of a chair or table;
• an adjusting arrangement (10) for adjusting the length of the support, whereby this adjusting arrangement (10) is adapted for coupling with the table or a seat of the chair;
• and
• a sleeve (20) having a tubular piece (21) that is inserted in the guiding tube (1) and has a main axis A, whereby the adjusting arrangement (10) goes through said sleeve, and whereby said sleeve has outside ribs (23) and inside ribs (42, 44) which are arranged along the periphery of the tubular piece (21) of the sleeve (20), wherein
• each inside rib (42, 44) comprises a first part having a stiff main body (41) that extends generally in the direction of the main axis A of the sleeve (20) and that has substantially a rectangular cross-section with lateral surfaces (48,49),
• said main body (41) has a front area (40) facing the adjusting arrangement (10), said main body (41) has corner sections where the lateral surfaces (48, 49) of the main body (41) meet the inside surface (43) of the tubular piece (21),
• each inside rib (42, 44) further comprises at least one lip (50,57) that protrudes from at least one of said corner sections and that has a surface (51) that faces the main axis A and on which the adjusting arrangement (10) can rest,
• said lip (50,57) has a yielding main body which extends along the stiff main body (41) of the inside rib (42, 44) generally in the direction of the main axis A of the sleeve (20),
• the yielding main body of the lip (50,57) is shaped such that at least the surface (51) of the lip (50, 57) that faces the main axis A is convex,
• each inside rib (42, 44) comprises also at least one groove (55,56) located between the front area (40) of the stiff main body (41) and the yielding main body of said lip (50,57),
• and said at least one groove (55,56) extends along the inside rib (42, 44) generally in the direction of the main axis A of the sleeve (20) and opens toward said main axis A.