1. Field of the Invention
The present invention relates to a telescopic tube assembly, and more particularly to a telescopic tube assembly for a clothes rack to enable the clothes rack user to easily adjust the height of the clothes rack.
2. Description of Related Art
A conventional clothes rack has two telescopic tube assemblies, and a crossbar respectively and securely connected to proximal ends of the two telescopic tube assemblies. Each telescopic tube assembly has an inner tube and an outer tube having the inner tube slidably received inside the outer tube via a positioning device which is mounted around the inner tube. The positioning device for positioning the inner tube inside the outer tube may be a boss eccentrically formed on an outer periphery of the inner tube to abut an inner periphery of the outer tube such that when the boss abuts the inner periphery of the outer tube, the inner tube is positioned relative to the outer tube. However, the positioning effect between the inner tube and the outer tube is not as good as expected. Because the positioning force between the inner tube and the outer tube relies only on the friction force between the boss and the inner periphery of the outer tube, the inner tube's sliding movement relative to the outer tube may not be linear especially when the boss is not fully disengaged with the inner periphery of the outer tube. That is, the inner tube's movement inside the outer tube may not be smooth due to the possible inclination of the inner tube relative to the outer tube.
To overcome the shortcomings, the present invention tends to provide an improved telescopic tube assembly for a clothes rack to mitigate the aforementioned problems.
The primary objective of the present invention is to provide an improved telescopic tube assembly for a clothes rack. The telescopic tube assembly is able to enable the clothes rack user to easily adjust the clothes rack height.
A different objective of the present invention is that the telescopic tube assembly is able to provide a uniform friction force between the inner tube and the outer tube so that the movement of the inner tube relative to the outer tube is smooth.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
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A top cap (30) is provided to close the top open end of the inner tube (20) and has an annular skirt (31) integrally extending from a circular disk (33), a first flange (32) formed on an outer peripheral edge of the circular disk (33) and a first through hole (34) centrally defined through the circular disk (33).
A bottom cap (50) is provided to close the bottom open end of the inner tube (20) and has a tubular extension (51), a second through hole (52) defined through the tubular extension (51) to correspond to and align with the first through hole (34) of the top cap (30), a first conical abutting face (53) formed on a bottom inner face of the tubular extension (51) and a second flange (54) formed on an outer peripheral edge of the bottom cap (50).
A stop (60) is provided on top of the top cap (30) to sandwich a recoil force providing device (35) with the top cap (30) and has a third through hole (61) defined to align with the first through hole (34) of the top cap (30). In this preferred embodiment, the recoil force providing device is a helical spring (35).
An abutting device (40A) is provided under the bottom cap (50) and has two halves. Each half of the abutting device (40A) is provided with a third flange (41), a second conical abutting face (42) to correspond to the first conical abutting face (53) of the bottom cap (50), a sectorial face (43,43′) extending upward from the second conical abutting face (42), an ear (45,45′) horizontally extending from an inner face on a top portion of the sectorial face (43) and a fourth through hole (46) defined through the ear (45,45′) to correspond to the second through hole (52) of the bottom cap (50). It is noted that the two sectorial faces (43,43′) respectively have a height different from the other. Accordingly the ears (45,45′) are respectively located at different positions in relation to one another so as to enable the two ears (45,45′) to overlap with each other and to align the two fourth through holes (46).
A drive rod (38) is extended through the fourth through holes (46) of the two halves of the abutting device (40A), the second through hole (52), the inner tube (20), the first through hole (34) of the top cap (30), the helical spring (35) and the third through hole (61) to fixedly engage with an inner periphery defining the third through hole (61). The drive rod (38) has a third conical abutting face (37) formed with the drive rod (38) and a block (36) downwardly formed with the third conical abutting face (37) of the drive rod (38) to correspond to the third flange (41).
When the telescopic tube assembly of the present invention is assembled, the top cap (30) and the bottom cap (50) are provided to close the two open ends of the inner tube (20). Then the inner tube (20) is inserted into the outer tube (10) and the drive rod (38) is extended through the fourth through holes (46) of the two halves of the abutting device (40A), the second through hole (52), the inner tube (20), the first through hole (34) of the top cap (30), the helical spring (35) and the third through hole (61) of the stop (60) to fixedly engage with an inner periphery defining the third through hole (61) so that the block (36) abuts an inner face of the third flange (41) with the recoil force providing device (35) sandwiched between the top cap (30) and the stop (60).
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It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.