Soft tube coupling with expanding internal sleeve

Details Soft tube coupling with expanding internal sleeve Soft tube coupling with expanding internal sleeve

2001-12-17

2003-03-25

Nicholson, Eric K. (Department: 3627)

Pipe joints or couplings

Nonmetal to metal

Internal member

C285S258000, C285S382400

Reexamination Certificate

active

06536808

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to joint structures of soft tubes, and particularly to a joint which can be firmly secured to a soft tube.
BACKGROUND OF THE INVENTION
Referring to
FIGS. 1 and 2
, a prior tube joint
10
for being connected to a soft tube
12
for transferring gas or liquid is illustrated. One end of the tube joint
10
is installed with a connecting end
11
for being engaged with the soft tube
12
. Then, a ring
13
encloses the soft tube
12
near one opening of the soft tube. By a stud
14
and a nut
15
, the ring
13
causes the soft tube
12
to be tightly engaged with the connecting end
11
. Thereby, the soft tube
12
is connected with the tube joint
10
. However, in this prior design, only a ring
13
is used to connect the soft tube
12
with the connecting end
11
of the tube joint
10
from the outer side. Therefore, the connection of the soft tube
12
and the tube joint
10
easily disengages due to the looseness of the stud
14
and the nut
15
or because the soft tube
12
hardens or deforms. Moreover, when the soft tube
12
is used to transfer high pressure gas or liquid, it is possible that the gas or liquid will jet out or leak out due to weak clamping force of the ring
13
. If the transferred gas or liquid is burnable or poisonous, a serious accident will occur.
SUMMARY OF THE INVENTION
Accordingly, the primary object of the present invention is to provide a joint of a soft tube which can be firmly secured to a soft tube.
To achieve the object, the present invention provide a joint of a soft tube comprising a tube joint, an inner sleeve, and an outer sleeve. The inner sleeve is inserted into the soft tube and then the soft tube is inserted into the outer sleeve; then the connecting end of the tube joint is inserted into the soft tube. Next, by a hand tool clamping the actuating ring to rotate the tube joint, the connecting end of the tube joint is screwed into the inner threaded hole of the inner sleeve. The connecting end will cause the section of the inner sleeve having slots to expand outwards. As a result, the corresponding wall of the soft tube will expand and thereby deformed so as to tightly resist against the enlarged end of the outer sleeve. Thereby, radial and axially connecting forces are formed, the soft tube can be firmly and tightly secured to the tube joint.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.


REFERENCES:
patent: 228161 (1880-06-01), Adlam
patent: 1181856 (1916-05-01), Downer
patent: 1890290 (1932-12-01), Hargreaves
patent: 2071478 (1937-07-01), Wick
patent: 2485049 (1949-10-01), Hallisy
patent: 2916816 (1959-12-01), Black et al.
patent: 3211476 (1965-10-01), Wagner
patent: 4212487 (1980-07-01), Jones et al.
patent: 4773678 (1988-09-01), Canaud et al.
patent: 5050912 (1991-09-01), Hayasaka
patent: 5967568 (1999-10-01), Bird

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