Machine element or mechanism – Control lever and linkage systems – Elements
Reexamination Certificate
2002-05-14
2004-01-13
Kim, Chong H. (Department: 2856)
Machine element or mechanism
Control lever and linkage systems
Elements
C074S544000, C403S384000, C016S436000
Reexamination Certificate
active
06675674
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is related to a locating/controlling structure for telescopic tube, and more particularly to a locating/controlling structure for effectively locating a telescopic tube with elliptic cross-section.
FIG. 6
shows a conventional locating structure for telescopic tube with elliptic cross-section. One end of the outer tube
81
of the telescopic tube
8
is provided with an outer tube fixing seat
82
. A base seat
83
is fitted through the outer tube fixing seat
82
, whereby the base seat
83
can be rotated thereabout. An elongated bar
84
with square cross-section is connected on the base seat
83
. A linking seat
85
is fitted on the elongated bar
84
. The linking seat
85
is formed with a square hole
851
through which the elongated bar
84
is passed. When turning the elongated bar
84
, the linking seat
85
is driven and rotated along with the elongated bar
84
.
The linking seat
85
has a projecting post
852
. One end of the projecting post
852
adjacent to the linking seat
85
has an eccentric section
853
. An eccentric block
86
with elliptic cross-section is fitted on the eccentric section
853
. The other end of the projecting post
852
is formed with an annular hook section
854
.
One end of the inner tube
87
fitted in the outer tube
81
is provided with an inner tube fixing seat
88
having a through hole
881
through which the projecting post
852
of the linking seat
85
is fitted. The hook section
854
of the projecting post
852
is engaged with and located on the inner tube fixing seat
88
, whereby the linking seat
85
can be rotated within the inner tube fixing seat
88
.
According to the above structure, by means of turning the base seat
83
, the elongated bar
84
is driven and rotated. At this time, the elongated bar
84
synchronously drives the linking seat
85
to rotate. The eccentric section
853
of the linking seat
85
is eccentrically rotated to push the eccentric block
86
against the inner wall face
811
of the outer tube
81
as shown in
FIGS. 7 and 8
. By means of the frictional force exerted by the eccentric block
86
against the inner wall face
811
, the inner tube
87
is locked with the outer tube
81
.
However, the eccentric block
86
should be able to move within the outer tube
81
. Therefore, the circumferential length of the eccentric block
86
must be shorter than the circumferential length of the inner wall face
811
of the outer tube
81
. In other words, the eccentric block
86
must be a smaller ellipse. Furthermore, the eccentric block
86
is driven by the eccentric section
853
to eccentrically rotate. Therefore, only the outer face of one side of the eccentric block
86
is deflected to about against the inner wall face
811
of the outer tube
81
as shown in FIG.
8
. As a result, the smaller elliptic eccentric block
86
only contacts with the inner wall face
811
of the larger outer tube by a small contacting area. Therefore, the locating force is insufficient.
The outer face of one side of the eccentric block
86
is deflected to abut against the inner wall face
811
of the outer tube
81
so as to provide a locating force. However, the inner wall face
811
exerts a reaction force onto the inner tube
87
to push the same toward the other side as shown in FIG.
7
. Therefore, the inner tube
87
is deflected from the outer tube
81
and unevenly suffers force. This affects the locating strength of the inner tube
87
and the outer tube
81
. Moreover, with one side of the inner tube
87
deflected to abut against the outer tube
81
, when using the telescopic tube, in the case that the inner tube
87
suffers a greater force, the inner tube
87
will be deflected and inclined from the outer tube
81
as shown in FIG.
9
. In the case that the telescopic tube is connected with a cutting or shearing tool, the strength and application force of the inner and outer tubes
87
,
81
will be affected.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a locating/controlling structure for telescopic tube. A rotary button is rotatably disposed at one end of the outer tube. The rotary button is connected with an elliptic rod passing through the outer tube. An inner tube is telescopically nested in the outer tube. One end of the inner tube fitted in the outer tube is provided with a cock body formed with a central circular hole through which the elliptic rod is passed. The cock body has a stop section protruding from the inner tube. The stop section is formed with two radially opposite receptacles. A movable block is disposed in each of the receptacles. Each movable block has a contacting face complementary to the inner circumference of the outer tube. When the rotary button is turned to drive the elliptic rod to rotate about the axis thereof, due to the different diameters of the elliptic rod, the elliptic rod pushes the two movable blocks to synchronously radially outward move, whereby the contacting faces of the movable blocks press and abut against the inner circumference of the outer tube to firmly locate the inner and outer tubes.
It is a further object of the present invention to provide the above locating/controlling structure for telescopic tube, in which the contacting face of each movable block is formed with slipproof ribs so as to increase the frictional force between the contacting faces and the inner circumference of the outer tube and thus enhance locating effect for the inner and outer tubes.
It is still a further object of the present invention to provide the above locating/controlling structure for telescopic tube, in which rotary button is rotatably connected with the handle to form an assembly. Therefore, the locating/controlling structure includes fewer components and can be more quickly assembled so as to reduce the problem of tolerance of clearance caused by assembly of numerous parts. Accordingly, the reliability of the telescopic tube is increased and the processing cost is lowered.
REFERENCES:
patent: 3620558 (1971-11-01), MacMillan et al.
patent: 5425225 (1995-06-01), Franco
patent: 5470090 (1995-11-01), Stewart eta l.
patent: 5822837 (1998-10-01), Schwellenbach et al.
patent: 6490761 (2002-12-01), Durrant
patent: 6588296 (2003-07-01), Wessel
Kim Chong H.
Rosenberg , Klein & Lee
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