A telescopic module includes a first tube, a second tube, a holder, and a plurality of rollers. The first tube has a passageway. The second tube is received in the passageway of the first tube for reciprocation. The holder is mounted on the first tube. The rollers are pivoted on the holder to rest against the second tube or the first tube, or both to touch an inner side of the first tube and an outer side of the second tube to be turned when the second tube is moving.

A telescopic module, which may be incorporated in a desk or a chair to elevate or lower a work surface, includes a first tube, a second tube, a holder, and a plurality of rollers. The first tube has a passageway. The second tube is received in the passageway of the first tube for reciprocation. The holder is mounted on the first tube. The rollers are pivoted on the holder to rest against the second tube or the first tube, or both to touch an inner side of the first tube and an outer side of the second tube to be turned when the second tube is moving. The rollers may reduce the friction between the first and the second tubes when the second tube is moving.

A fully automatic telescopic rod includes at least two sleeves and one operation handle. The operation handle is fitted to a lower end of an outer sleeve of the at least two sleeves. A first inner sleeve of the at least two sleeves is movably fitted in the outer sleeve. The operation handle includes a power mechanism therein. The power mechanism is connected to a screw rod extending into the first inner sleeve and drives the screw rod to rotate in a forward or reverse direction. A nut is mated with the screw rod and fixed to a lower end of the first inner sleeve. The first inner sleeve can be unfolded and folded relative to the outer sleeve and can be positioned at any position.

A telescopic module includes a first tube having a passageway therein; a second tube received in the passageway of the first tube for reciprocation; a hub connected to the second tube; a roller pivoted on the hub to touch the inner side of the first tube; and an adjusting member. The hub is provided with an expanding hole and flexible portions. The roller is pivoted on the flexible portion, and the adjusting member is inserted into the expanding hole and abuts against the flexible portions to move the roller outwardly.

A telescopic module, which may be incorporated in a desk or a chair to elevate or lower a worksurface, includes a first tube, second tube, and a plurality of rollers. The first tube has a passageway, in which the second tube is received for reciprocation. The rollers are pivoted on the second tube or the first tube, or both to touch an inner side of the first tube and an outer side of the second tube to be turned when the second tube is moving. The rollers may reduce the friction between the first and the second tubes when the second tube is moving.

An adjustable assembly for a bicycle includes a first support having an interior surface and a second support slidably positioned within at least a portion of the first support. One of the first support and the second support is adapted to attach to a first bicycle portion, and the other of the first support and the second support is adapted to attach to a second bicycle portion. Further, the second support comprises an expansion portion configured to be moved between an expanded position and a retracted position. The expansion portion is configured to engage the interior surface of the first support when the expansion portion is in an expanded position. In addition, the first support is configured to be selectively moved relative to the second support when the expansion portion is permitted to assume a retracted position.

According to some embodiments, an adjustable assembly for a bicycle includes a lower tubular support configured to be attached to a bicycle frame; an upper tubular support configured to be attached to a bicycle saddle; an expansion portion support member positioned within an interior space of the lower tubular support; an expansion portion disposed at an upper end of the expansion portion support member; and a resilient member configured to provide an upwardly-directed force to the upper tubular support to provide movement of the upper tubular support away from the lower tubular support.

According to some embodiments, an adjustable assembly for a bicycle includes a lower tubular support configured to be attached to a bicycle frame; an upper tubular support configured to be attached to a bicycle saddle; an expansion portion support member positioned within an interior space of the lower tubular support; an expansion portion disposed at an upper end of the expansion portion support member; and a resilient member configured to provide an upwardly-directed force to the upper tubular support to provide movement of the upper tubular support away from the lower tubular support.

According to some embodiments, an adjustable assembly for a bicycle includes a lower tubular support configured to be attached to a bicycle frame; an upper tubular support configured to be attached to a bicycle saddle; an expansion portion support member positioned within an interior space of the lower tubular support; an expansion portion disposed at an upper end of the expansion portion support member; and a resilient member configured to provide an upwardly-directed force to the upper tubular support to provide movement of the upper tubular support away from the lower tubular support.

An adjustable assembly for a bicycle includes a first support having an interior surface and a second support slidably positioned within at least a portion of the first support. One of the first support and the second support is adapted to attach to a first bicycle portion, and the other of the first support and the second support is adapted to attach to a second bicycle portion. Further, the second support comprises an expansion portion configured to be moved between an expanded position and a retracted position. The expansion portion is configured to engage the interior surface of the first support when the expansion portion is in an expanded position. In addition, the first support is configured to be selectively moved relative to the second support when the expansion portion is permitted to assume a retracted position.