Expansible chamber devices – Sealed opening in longitudinal wall of chamber for receiving...
Reexamination Certificate
2000-10-16
2002-07-30
Lopez, F. Daniel (Department: 3745)
Expansible chamber devices
Sealed opening in longitudinal wall of chamber for receiving...
C092S169100
Reexamination Certificate
active
06425315
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rodless cylinder, and more specifically to a seal structure for a rodless cylinder in which an opening of a cylinder tube is sealed by an end cover.
2. Description of the Related Art
A general overview of a conventional seal structure for a rodless cylinder is given in FIG.
7
.
As can be seen from
FIG. 7
, a reciprocating piston
14
is fitted into a cylinder
12
of a rodless cylinder
10
, and the cylinder tube
12
has openings on both ends (only an opening on one end side is shown in
FIG. 7
) blocked by end covers
22
each having a cushion ring
20
in communication with a pressurizing fluid inlet/outlet hole
18
. The piston
14
is fitted with a piston packing
16
to seal the leakage of a pressurizing fluid acting upon the piston
14
. The piston packing
16
is provided in close contact with the inner circumferential surface of the cylinder tube
12
and a seal belt
24
having its both ends rigidly attached to the end covers
22
.
Meanwhile, in the seal structure to seal the opening of the cylinder tube
12
by the end cover
22
, a boss portion
22
a
having a similar shape to the inner circumferential shape of the cylinder tube
12
is projected to the end cover
22
, and a seal member
28
is mounted to an outer circumferential groove
26
formed by machining using a lathe for example at the mid position of the outer circumferential surface of the boss portion
22
a.
Note however that in this conventional seal structure for the rodless cylinder
10
, the size in the longitudinal direction must be reduced in order to reduce the entire size. Furthermore, the work to form the outer circumferential groove
26
at the boss portion
22
a
has kept the manufacturing process from being simplified for reducing the manufacturing cost.
SUMMARY OF THE INVENTION
It is a general object of the present invention to provide a seal structure for a rodless cylinder which allows the size and manufacturing cost to be reduced by shortening the boss portion of an end cover blocking a cylinder tube and by removing the outer circumferential groove otherwise formed in the boss portion to fit a seal member.
The above and other objects, features and advantages of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings in which a preferred embodiment of the present invention is shown by way of illustrative example.
REFERENCES:
patent: 5606903 (1997-03-01), Drittel
Kaneko Junya
Koyama Hideho
Guss Paul A.
Leslie Michael
Lopez F. Daniel
SMC Kabushiki Kaisha
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