Pipe joints or couplings – Variable length – Telescopic with relative motion
Reexamination Certificate
2003-01-30
2004-04-13
Bochna, David (Department: 3679)
Pipe joints or couplings
Variable length
Telescopic with relative motion
C285S298000, C285S391000, C239S532000
Reexamination Certificate
active
06719331
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a telescopic tube with water supply. It is mainly equipped with a minor tube, a major tube that are connected to each other by a tubular coupling device. The tubular coupling device has a registration end and a connecting section, the former is engaged with one end of the minor tube and the latter is engaged with the top end of the major tube. A guard cap is secured to the top end of the major tube which serves to prevent the minor tube from easy disengagement from the major tube in case of excessive extension adjustment. The connecting section of the tubular coupling device has a cone shaped configuration with a spiral thread track defined thereon and terminates in a stop board. A pair of support halves having tapered inner surface are movably registered with the spiral thread track and are outwardly expanded or retracted as moving against the cone shaped connecting section so that the outer surface of the support halves can be urged against the inner side of the major tube to hold the coupling device and the minor tube in place in length adjustment and vice versa for retraction of the telescopic tube. Thus the telescopic tube can be adjusted of its length and secured in place by simple rotation of the major tube and moving the minor tube to make the adjustment easy, speedy and precise.
Referring to
FIG. 1
, a conventional telescopic tube with water supply is made up of a locking retainer
10
, a stopper
20
, a coupler
30
, a minor tube
40
and a major tube
50
. The locking retainer
10
has an internally threaded section
11
and a cone shaped top through hole
12
. The stopper
20
is a stepwise form with a through hole
21
at the center and has a small upper section
21
and a large bottom section
22
. At the end of the small upper section
21
is defined a peripheral groove
221
for receiving a seal ring
222
. There are a pair of peripheral protrusions
231
defined at the top and bottom end of the large bottom section
23
so as to permit a seal ring
232
to be placed in the groove formed therebetween. The coupler
30
is provided with a through hole having two sections having different diameters
31
and
32
so as to form a shoulder
33
at the joint thereof. On the external surface of the large diameter section
31
is disposed a protruded rib area and on the small diameter section
32
is disposed a threaded section
34
with a plurality of flexible claw pieces
35
separated by equally spaced splits
36
. The minor tube
40
has a cleaning means
41
at one end which can be a sprinkler or a brush. The major tube
50
has a connector
51
having a connection head
511
with internal threads
512
.
As shown in
FIG. 2
, the assembled telescopic tube can be adjusted of its length by extending or retracting the minor tube
40
with respect to the major tube
50
and then the locking retainer
10
is rotated tight to urge the flexible claw pieces
35
to firmly grasp the minor tube
40
in place. The other end of the major tube
50
is coupled to a water inlet duct so as to permit water to flow into the telescopic tube and discharged via the cleaning means
41
.
Such a conventional telescopic tube has the following disadvantages in operation:
1. The locking retainer
10
must be rotated back and forth to make the length adjustment of the telescopic tube tedious and inconvenient.
2. The flexible claw pieces
35
are easily worn out and broken as a result of repeated usage, causing the coupler
30
having worn out thread section
34
unable to lock the minor tube
40
in position.
3. The locking retainer
10
and the coupler
30
are exposed externally and are broken easily in operation.
SUMMARY OF THE INVENTION
Therefore, the primary object of the present invention is to provide a telescopic tube with water supply the length of which can be adjusted by simply rotating the major tube and extending or retracting a minor tube and then rotating the major tube further in an opposite direction to get a pair of support halves having a tapered inner face in locking abutment against the major tube in an easy, speedy and precise manner.
Another object of the present invention is to provide a telescopic tube with water supply which is equipped with a tubular coupling device having a cone shaped connecting section on which is defined a spiral thread track. The two support halves each having a retaining blocks in registration with space defined on the gaps of the spiral thread track, and having a tapered inner face are used to get the two support halves fixed in place in abutment with the cone shaped connecting section so that the rotation of the major tube results in the tapered support halves moving upwardly or downwardly along the spiral thread track of the tubular coupling device to hold the minor tube in place with respect to the major tube without abrasion.
One further object of the present invention is to provide a telescopic tube with water supply having the tubular coupling device for coupling the major tube and the minor tube together and the two support halves concealed in the major tube so as to make the appearance appealing in one aspect and to protect the parts from easy damage in practical operation in another aspect.
REFERENCES:
patent: 2261505 (1941-11-01), Schlesinger
patent: 4108202 (1978-08-01), Schoepe
patent: 5035257 (1991-07-01), Antunez
patent: 5897268 (1999-04-01), Deville
patent: 6027087 (2000-02-01), Lindemann et al.
patent: 6322006 (2001-11-01), Guo
Bochna David
Troxell Law Office PLLC
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