DE211977C - - Google Patents
Info
- Publication number
- DE211977C DE211977C DE1909211977D DE211977DA DE211977C DE 211977 C DE211977 C DE 211977C DE 1909211977 D DE1909211977 D DE 1909211977D DE 211977D A DE211977D A DE 211977DA DE 211977 C DE211977 C DE 211977C
- Authority
- DE
- Germany
- Prior art keywords
- opening
- tube
- pin
- exit
- roughened
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/02—Burettes; Pipettes
- B01L3/0241—Drop counters; Drop formers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/02—Burettes; Pipettes
- B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/08—Geometry, shape and general structure
- B01L2300/0832—Geometry, shape and general structure cylindrical, tube shaped
- B01L2300/0838—Capillaries
Landscapes
- Health & Medical Sciences (AREA)
- Clinical Laboratory Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Devices For Use In Laboratory Experiments (AREA)
- Sampling And Sample Adjustment (AREA)
Description
KAISERLICHESIMPERIAL
PATENTAMT.PATENT OFFICE.
Die Tropfpipette bewirkt ohne Dazutun des bei den bisher bekannt gewordenen Tropfenzählern die Weite der Luftzutrittsöffnung regulierenden Fingers den Austritt der zu messenden Flüssigkeit in Tropfenform während der Gesamtdauer der Handhabung. Hierdurch ist der Abfluß in zusammenhängendem Strahl, was bisher bei minder vorsichtigem öffnen der Luftzutrittsöffnung leicht eintreten konnteThe dropper works without doing the same with the drop counters known so far the width of the air inlet opening regulating the exit of the finger to be measured Liquid in the form of drops for the entire duration of handling. This is the drain in a coherent stream, which has hitherto been the case with less careful opening the air inlet opening could easily enter
ίο und eine Wiederholung des Verfahrens bedingte, durch die Unabhängigkeit der Funktionen von willkürlichen Einflüssen ausgeschlossen. Ferner wird durch die gegenseitige Anordnung der Normalabtropffläche (3 mm Durchmesser) und der Austrittsöffnung verhindert, daß eine Tropfenbildung unter dem unmittelbaren Druck einer darüber stehenden Flüssigkeitssäule stattfindet, so daß das Tropfengewicht weniger durch deren Veränderlichkeit beeinflußt wird und sich mehr einem durch die in regelmäßigen Zeiträumen erfolgende Ablösung der Tropfen begünstigten konstanten Wert nähert.ίο and a repetition of the procedure excluded by the independence of the functions from arbitrary influences. Furthermore, the mutual arrangement of the normal draining surface (3 mm diameter) and the exit orifice prevents drop formation under the immediate pressure a column of liquid above it takes place, so that the drop weight is less is influenced by their variability and is more one through the regular Periods of detachment of the drops favored constant value approaches.
Die Zeichnung veranschaulicht eine Ausführungsform der Erfindung in einem Längsschnitt. The drawing illustrates an embodiment of the invention in a longitudinal section.
Das Steigrohr 1 ist in bekannter Weise am oberen Ende mit einer Kautschukbirne 2 sowie mit dem seitlichen, beim Ansaugen der Pipette zu schließenden Luftzutrittsstutzen 3 und dem Sammelbehälter 4 ausgestattet. Das untere Ende des Steigrohres 1 setzt sich in einen gerauhten Vollglasstift 5 vom Normaldurchmesser fort, über dem in der Glasröhre eine kapillare Öffnung 6 angeordnet ist. Die seitliche Anordnung dieser Öffnung 6 und die dadurch geschaffenen Austrittsbedingungen der Flüssigkeit, ferner die an der zur Öffnung 6 günstig gelegenen, angerauhten Umfangsfläche des Stiftes 5 stattfindende starke Adhäsion verhindert einen raschen Austritt und erzeugt somit eine gleich von Anfang an und bis zum Ende währende deutlich verfolgbare und regelmäßige Tropfenbildung. Der letztere Umstand bewirkt, daß das Gewicht der einzelnen sich von der Stirnfläche des Stiftes 5 ablösenden Tropfen einen konstanten Wert erreicht.The riser pipe 1 is in a known manner at the upper end with a rubber bulb 2 as well with the air inlet nozzle on the side that closes when the pipette is sucked in 3 and the collecting container 4 equipped. The lower end of the riser pipe 1 is set in a roughened solid glass pin 5 away from the normal diameter, above that in the glass tube a capillary opening 6 is arranged. The lateral arrangement of this opening 6 and the The exit conditions of the liquid created thereby, furthermore those at the opening 6 conveniently located, roughened peripheral surface of the pin 5 taking place strong adhesion prevents a rapid exit and thus creates a right from the start and up to Clearly traceable and regular drop formation in the end. The latter circumstance causes the weight of the individual to detach from the end face of the pin 5 Drops reaches a constant value.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE211977T | 1909-01-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE211977C true DE211977C (en) |
Family
ID=32442409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1909211977D Expired - Lifetime DE211977C (en) | 1909-01-05 | 1909-01-05 |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE211977C (en) |
| FR (1) | FR399703A (en) |
| GB (1) | GB190905559A (en) |
-
1909
- 1909-01-05 DE DE1909211977D patent/DE211977C/de not_active Expired - Lifetime
- 1909-01-23 FR FR399703D patent/FR399703A/en not_active Expired
- 1909-03-08 GB GB190905559D patent/GB190905559A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR399703A (en) | 1909-07-06 |
| GB190905559A (en) | 1909-06-17 |
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