Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition
Reexamination Certificate
1999-01-25
2001-07-24
Warden, Jill (Department: 1743)
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
C422S091000, C422S105000, C436S180000, C073S864140
Reexamination Certificate
active
06264894
ABSTRACT:
The invention relates to a device for holding a pipette in a pipetting aid, permitting gastight insertion of the pipette into the pipetting aid without contact pressure having to be exerted by the person handling it.
Pipetting aids which are known in the prior art have an essentially soft plastic or rubber attachment part suitable for holding pipettes. The end part of conventional pipettes which is intended for insertion into the pipetting aid usually has an external diameter of about 7 mm and can generally be inserted 1 to 2 cm into the attachment part or the neck of the pipetting aid. To make insertion easier, the attachment part of the pipetting aid is given a conical shape in the area of its aperture. By pressing the end part of the pipettes against the conical aperture, the end part is pushed into the attachment part of the pipetting aid. In doing so, the soft plastic or rubber closes tightly round the end part of the pipette.
In the case of Peläus balls and similar pipetting aids, the attachment part is not shaped conically. Here, an outer rubber bead is provided which has a slightly smaller internal diameter than the external diameter of the end part of the pipette. In order to introduce the end part of the pipette into the attachment part, a pressure or contact pressure has to be overcome here to ensure the necessary gastight insertion of the end part of the pipette into the pipetting aid. When inserting the pipette into the pipetting aid with pressure, it often happens that the pipettes break, particularly those made of glass. In some circumstances this can lead to serious injuries to the person handling the pipette.
The object of the present invention is to remedy the disadvantages of the prior art. In particular, the aim is to make available a device for holding a pipette in a pipetting aid, with which device the risk of injury when inserting the pipette into the pipetting aid is reduced.
This object is achieved by the features of Claim
1
. Expedient embodiments of the invention are evident from the features of claims
2
to
12
.
According to the invention, a device for holding a pipette in a pipetting aid is provided, permitting gastight insertion of the pipette into the pipetting aid without contact pressure having to be exerted by the person handling it, spreader elements being cast in a soft rubber or plastic aperture bead of the pipetting aid, and it being possible for the spreader elements to have their positions relative to each other changed by means of tensioning elements in such a way that the aperture bead can be widened for the insertion of the pipette. The proposed device allows the operator to insert the end part of the pipette into the attachment part of the pipetting aid without exerting any appreciable contact pressure. In this way, breakage, especially of pipettes made of glass, is avoided during insertion. The risk of injury is reduced.
REFERENCES:
patent: 989503 (1911-04-01), Hilderbrand
patent: 2516965 (1950-08-01), Dresser
patent: 2540360 (1951-02-01), Ulvild
patent: 2724275 (1955-11-01), Persson et al.
patent: 2728232 (1955-12-01), Bremmer
patent: 3893813 (1975-07-01), Johnson
patent: 4114659 (1978-09-01), Goldberg et al.
patent: 5510083 (1996-04-01), Sack et al.
patent: 5985219 (1999-11-01), Lind
patent: 381 891 (1964-11-01), None
patent: 950 035 (1956-10-01), None
patent: 92 05 961 (1992-07-01), None
Bex Kathryn
Pearne & Gordon LLP
Warden Jill
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