Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition
Patent
1992-12-30
1995-10-10
Warden, Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
7386322, 7386413, 7386414, 7386417, B01L 302, G01N 114
Patent
active
054568790
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns e pipette comprising a body; mounted in said body, a plurality of mutually parallel, side-by-side cylinders with plungers, plunger rods end seats for attaching tip pieces the pipette, end a fork-like operating member comprising a stem and a coupling member thereto connected, the plunger rods with their plungers being connected said coupling member in order to be simultaneously movable with the aid of an operating means that can be connected to the operating member, the operating member with stem, coupling member and plunger rods constituting a solid entity, advantageously formed substantially in a single work step, e.g. by extrusion
Regarding the state of art, reference is made to the Finnish Patents No. 60137 and No. 73368. In these references pipettes of the type described above are disclosed, in which the plunger rods with plungers are connected to a fork-like operating member for moving the plungers simultaneously with the aid of an operating means connectable to the operating member. However, problems have emerged in pipettes of kind, particularly as regards the mutually consistent movement of the plungers. The plungers tend to move inconsistently end even to seize in the cylinders is due to manufacturing tolerances end to the even minor centering errors in a plunger are likely to result in seizing, as the adjacent plunger(s) determine(s) the detection in which the coupling member, and consequently the rest of the plunger rods and plungers, move.
The object of the present invention is to eliminate the drawbacks to which attention was called in the foregoing.
It is a further object of the invention to provide a novel serial pipette which is less complex in design, more reliable in operation and more advantageous to its manufacturing cost than any serial pipettes of prior art.
Regarding the features characterizing the invention reference is made to the claims section.
As set forth in the foregoing, the operating member has fork-resembling shape. The coupling member connects with the stem substantially at right angles, and the plunger rods connect with the coupling member substantially at right angles, parallelling the stem and disposed in a row, one beside the other. Therefore, the operating member is a solid, unitary entity which connects on one hand with the operating means of the pipette, e.g. a hydraulically or pneumatically operating power means, and on the other hand with the plungers of the pipette. By virtue of the design of said operating means, operation of the plungers of the serial pipette will be simultaneous and mutually consistent.
As taught by the invention, the plungers are made of resilient material and they are elastically connected to the plunger rods.
In an embodiment of the invention the plungers are cylindrical in shape, and they have been arranged to abut with their outside surface against the inner surface of the cylinder. On their outside may be formed at least one collar-like sealing ring, and each plunger, with sealing ring, has been shaped in a single work step of a single material, e.g. by extrusion moulding.
The cylinders are connected to the body advantageously at both ends and immovably in their longitudinal, as well as advantageously their lateral, direction.
Thanks to the invention the manufacturing of the pipette's operating member and plungers can be implemented in a simple, easy and inexpensive manner. At the same time, simple and consistent operation of the pipette is achieved, i.e., the emptying and filling of cylinders takes place in a constant and consistent, and reliable way. Further, thanks to the invention, the pipette of the invention is advantageous as regards manufacturing cost.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in detail in the following, with the aid of embodiment examples and referring to the attached drawing, wherein:
FIG. 1 presents a pipette according to the invention, opened and in top view,
FIG. 2 presents the pipette of FIG. 1, opened and in elevational view, and
FIG. 3 presents, in elev
REFERENCES:
patent: 2575425 (1951-11-01), Nelson
patent: 3656480 (1972-04-01), Rubricius
patent: 4158035 (1979-06-01), Haase et al.
patent: 4215092 (1980-06-01), Suovaniemi et al.
patent: 4335621 (1982-06-01), Tervamaki et al.
patent: 4599220 (1986-07-01), Yonkers et al.
patent: 4779467 (1988-10-01), Rainin et al.
patent: 4824642 (1989-04-01), Lyman et al.
patent: 4967604 (1990-10-01), Arpagaus et al.
patent: 5057281 (1991-10-01), Torti et al.
Biohit Oy
Dawson E. Leigh
Warden Robert J.
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