Joints and connections – Articulated members – Lockable at fixed position
Reexamination Certificate
2001-01-10
2002-06-25
Browne, Lynne H. (Department: 3629)
Joints and connections
Articulated members
Lockable at fixed position
C248S188500, C248S411000, C403S109100
Reexamination Certificate
active
06409412
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is related to a locking and unlocking structure for a telescopic tube, in which the daughter tube is firmly locked with the mother tube by means of restricting holes and frictional stop holes of restricting plates and restricting rings with biased axis. Therefore, the daughter tube can be stagelessly adjusted in length and more firmly locked with the mother tube. Moreover, the adjustment device and the adjustment rod are both installed in the daughter and mother tubes so that the appearance of the telescopic tube will not be affected.
FIG. 1
shows a conventional locking and unlocking structure of a telescopic tube. A daughter tube
11
is fitted in a mother tube
10
. The outer diameter of the daughter tube
11
is slightly smaller than the inner diameter of the mother tube
10
, whereby the daughter tube
11
can be freely moved within the mother tube
10
. The circumferential wall of the mother tube
10
is formed with multiple adjustment holes
101
at equal intervals. The rear end of the daughter tube
11
is formed with a through hole
111
in which a V-shaped snap button
112
is mounted. The snap button
112
has a press section
113
protruding out of the through hole
111
of the daughter tube
11
into one of the adjustment holes
101
of the mother tube
10
at a certain length. When adjusted, the press section
113
is pressed inward to disengage from the adjustment hole
101
. Under such circumstance, the daughter tube
11
is unlocked and can be freely moved within the mother tube
10
to a certain length. When the press section
113
is again bounded into a certain adjustment hole
101
, the daughter tube
11
is again locked with the mother tube
10
.
The above structure has a shortcoming as follows: The adjustment holes
101
of the mother tube
10
are arranged at certain intervals so that the daughter tube
11
cannot be stagelessly adjusted. As a result, a user may be unable to adjust the telescopic tube to an optimal length meeting the requirement of the height of the user.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide an adjustable locking and unlocking structure for a telescopic tube, in which the adjustment structure can be stagelessly adjusted so that a user can have a using length most suitable for the user's height. Therefore, the telescopic tube can be more conveniently used and the application range is wider.
It is a further object of the present invention to provide the above adjustable locking and unlocking device in which the daughter tube is firmly locked with the mother tube by means of restricting holes and frictional stop holes with biased axis. Therefore, in use or operation, the daughter tube is prevented from retracting into the mother tube. Therefore, the daughter tube is better located by the adjustment device.
It is still a further object of the present invention to provide the above adjustable locking and unlocking device in which the adjustment device and the adjustment rod are both installed and hidden in the daughter tube and mother tube so that the appearance of the telescopic tube will not be affected.
The present invention can be best understood through the following description and accompanying drawings wherein:
REFERENCES:
patent: 2806723 (1957-09-01), Fairclough
patent: 3734441 (1973-05-01), Lux
patent: 3893730 (1975-07-01), Homier et al.
patent: 5184835 (1993-02-01), Huang
patent: 5971341 (1999-10-01), Pfister
Browne Lynne H.
Ferguson Michael P
Troxell Law Office PLLC
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