Expansible chamber devices – Bellows type expansible chamber
Reexamination Certificate
1998-12-14
2001-02-20
Ryznic, John E. (Department: 3745)
Expansible chamber devices
Bellows type expansible chamber
Reexamination Certificate
active
06189433
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an improvement in a pneumatically driven bellows pump with a bellows that is reciprocable by a pneumatic force.
2. Discussion of the Background
Conventionally, the pump of the type or a reciprocable pump includes a cylinder
51
and cylinder heads
52
arranged at the opposite ends of the cylinder
51
, as illustrated in FIG.
8
. Outside of the cylinder
51
are provided a plurality of slide cylinders
53
which interconnect the cylinder heads
52
of the opposite ends of the cylinder
51
together. Interlocking shafts
54
are respectively inserted into the slide cylinders
53
, each being secured at its opposite ends to interconnecting plates
55
via mounting bolts
56
.
A pair of pistons
57
are oppositely disposed within the cylinder
51
, which respectively include pump shafts
59
that are reciprocable along the longitudinal axis of the pump and with regard to shafts
58
extending inwardly from the central portions of the corresponding interconnecting plates
55
, and shaft plates
60
mounted to corresponding ends of the pump shafts
59
. The pistons
57
are respectively supported by bellows bodies
63
whose outer ends are respectively mounted to corresponding shaft plates
60
via mounting bolts
61
, and inner ends are respectively welded to a pump-driving member
62
. The pistons
57
are reciprocable along the longitudinal axis of the pump by the expansion and contraction of the bellows bodies
63
. An air chamber
64
for allowing the bellows bodies
63
to be reciprocated therein is formed by the cylinder
51
, the cylinder heads
52
and the shaft plates
60
.
A sensor (not shown) senses the stroke end of the bellows in order to allow the switching of the introduction of the airflow for the air chamber
64
. Whereby, fluids or the like can be discharged from the pump-driving member
62
via reciprocation of the pistons
57
. Valves
65
are respectively urged by springs
66
so that the oppositely positioned bellows within the pump can be communicated with each other.
In accordance with the pump of the above arrangement, the bellows bodies
63
which limit the reciprocation of the pistons
57
seal the spaces inside of the bellows by the arrangement that the inner ends of the bellows bodies
63
are welded to the pump-driving member
62
. Referring to
FIG. 9
, as an alternative to this arrangement, the bellows bodies
63
whose outer ends of the bellows bodies
63
are respectively mounted to the shaft plates
67
are held at their inner ends between pump-driving member
68
and spacers
69
, and fixed therebetween via bolts
70
, as illustrated in
FIG. 9
, in which the arrangement only for one of the bellows bodies
63
are illustrated, since the arrangement for another bellows body
63
is the same as that for the one bellows body
63
.
When parts such as the bellows bodies
63
are damaged in the pump of the above arrangement, it may not easy to replace them with new ones since the replacement of these parts involves a troublesome work due to the above arrangement. Thus, the pump having the above arrangement may be in trouble with its maintenance.
To avoid such trouble, it is conceivable to employ the arrangement that the bellows bodies
63
are mounted to the pump-driving member
62
by fastening screws or bolts. However, this arrangement also poses a problem that heat or vibration caused by the operation of the pump may loosen the screws or bolts, and subsequently cause clearances in the mounting portion of the bellows bodies. This may lead to leakage of the fluid, and deteriorate a sealing effect within the bellows bodies
63
. Therefore, this arrangement does not provide an essential solution for the above problem.
Therefore, the present invention has been conceived to solve the above problems. It is an object of the present invention to provide a pneumatically driven bellows pump with the arrangement that has ease of maintenance of the pump by replacing the bellows in a simple manner.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a pneumatically driven bellows pump including a bellows that is reciprocable by a driving force effected by air. The bellows has an integral form of a bellows body, an expansion portion and a mounting portion. The mounting portion includes a threaded member, through which the bellows is brought into threaded engagement with a threaded member formed in a pump-driving member in such a manner as to seal the bellows.
In case of, for example, wear and tear, and breakage, with the pump of the above arrangement, the bellows can easily be replaced by releasing the mounting portion from threaded engagement with the pump-driving member.
REFERENCES:
patent: 398525 (1889-02-01), McCloskey
patent: 1484140 (1924-02-01), Mallory
patent: 2781565 (1957-02-01), Atchison
patent: 3099189 (1963-07-01), Blondiau
patent: 5195878 (1993-03-01), Sahiavo et al.
patent: 5377950 (1995-01-01), Salcudean et al.
Arent Fox Kintner & Plotkin & Kahn, PLLC
Ryznic John E.
Tacmina Corporation
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