Telescoping assembly

1. A telescoping assembly comprising:

a first tube member having a first coupling end, and having a first inner peripheral surface which defines a first axial bore;

a second tube unit including

a second tube member which has a second coupling end telescopically connected to said first coupling end along the longitudinal axis, and which is axially movable between an extended position, where said second tube member extends out of said first axial bore, and a retracted position, where said second tube member is received in said first axial bore, and

an inner tubular member which is coupled to said second coupling end to move with said second tube member inside said first axial bore, and which defines a shoulder surface; and

an outer sleeve including

an upper segment configured to be sleeved on and in frictional engagement with said first coupling end,

a lower segment configured to be slidably engaged with said second tube member so as to permit said second tube member to move relative to said outer sleeve, and

a middle segment disposed between said upper and lower segments, and having a first wall region and a second wall region which are opposite to each other in a radial direction relative to the longitudinal axis, characterized in that

said middle segment has a latch bore which extends in the radial direction through said first wall region and into said second wall region to terminate at a limiting surface; and

said telescoping assembly further comprising a latch block which is disposed in said latch bore, and which defines therein a through hole for passage of said second tube unit, said latch block including an actuating end region and a blocking end region which are at two opposite sides of said through hole, said latch block being slidable in said latch bore such that in response to pressing of said actuating end region toward said limiting surface, said latch block is displaced from a locked position, where said blocking end region is in blocking engagement with said shoulder surface, to an unlocked position, where said blocking end region is disengaged from said shoulder surface.

2. The telescoping assembly according to claim 1 , characterized in that

said second tube member defines therein a second axial bore at said second coupling end, and

said inner tubular member has

a distal end segment,

a proximate end segment fitted in said second axial bore to permit said inner tubular member to move with said second tube member in said first axial bore, and

a neck portion disposed between said distal and proximate end segments, and forming, with said distal end segment, said shoulder surface.

3. The telescoping assembly according to claim 1 , further characterized by a guiding pin disposed in said latch bore in proximity to said limiting surface, said latch block having a guided slot which is formed in said blocking end region and which is configured to receive therein said guiding pin so as to permit a guided movement of said latch block in the radial direction.

4. The telescoping assembly according to claim 3 , characterized in that said guided slot extends along a first axis in the radial direction into said through hole, said through hole having a first dimension along the first axis, and a second dimension which is defined along a second axis transverse to the longitudinal axis and the first axis, and which is smaller than the first dimension.

5. The telescoping assembly according to claim 1 , characterized in that

said latch block further includes a tab extending upwardly from said actuating end segment to facilitate manual operation, and

said upper segment of said outer sleeve has an opening which extends radially to provide access to said first coupling end, and which is configured to accommodate the movement of said tab,

said telescoping assembly further comprising a biasing member disposed between said first coupling end and said tab to bias said latch block to the locked position.