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Número de publicaciónUS917442 A
Tipo de publicaciónConcesión
Fecha de publicación6 Abr 1909
Fecha de presentación16 Sep 1908
Fecha de prioridad16 Sep 1908
Número de publicaciónUS 917442 A, US 917442A, US-A-917442, US917442 A, US917442A
InventoresAlbert Edward Hutchinson
Cesionario originalAlbert Edward Hutchinson
Exportar citaBiBTeX, EndNote, RefMan
Enlaces externos: USPTO, Cesión de USPTO, Espacenet
Pipette attachment.
US 917442 A
Resumen  disponible en
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Reclamaciones  disponible en
Descripción  (El texto procesado por OCR puede contener errores)



APrLIoATIoN FILED JAN. 22, 1907. BENEWBD SEPT. 1e, 190s.

Patented Apr. 6, 1.909.

- /Nl/ENTOR L f zeff'jfuz/az ATTORNEYS rm: amers .versies co.. wAsHmcraN, n4 c.

UNITED sTATns ATnnT orario.



Application filed January 22, 1907, Serial No. 353,436. Renewed September 16, 1908.

Specification of Letters Patent.

Patented April 6, 1909.

Serial No. 453,344.

To all whom it may concern,.-

Be it known that I, ALBERT EDWARD HUToHINsoN, a citizen of the United States, and a resident of Victor, in the county of Teller and State of Colorado, have invented a new and Improved Pipette Attachment, of which the following is a full, clear, and exact description.

This invention is directed to improvements in pipette attachments, embodying a construction easily operable to draw into the pipette when ap lied thereto, any required quantity of liquid and eject the same when desired.

The operation of the attachment is such that the admission of the liquid to the pipette can be gaged with minuteness, making the invention particularly desirable in cases where precision is required.

Reference is to be had to the accompanyingl drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the fig- Figure l is a perspective view of one embodiment of my invention with a pipette applied thereto; Fig. 2 is a longitudinal, central, vertical section of the attachment to the upper portion of a pipette, and Fig. 3 is a cross section on the line 3-3 of Fig. 2 showing the roller in full.

The invention comprises a trough-like body composed of a base l with flanges 2 at each side thereof, said body being preferably constructed of sheet metal as illustrated. The flanges 2 are provided with alining, longitudinal slots 3 positioned a suitable distance from the base 1 and form bearings for trunnions 4 projecting from the ends of a roller 5, said roller preferably being knurled on its circumference and of such length as to neatly fit between the fianges. Placed between the base 1 of the trough-like body and the roller 5 is a rubber or other flexible tube 6, the lower end of which passes through a split clamp 7, preferably formed as an integral part of said body, and provided with paral el meeting portions 8 through which a thumb-nut 9, threaded into one of them, is passed. The clamp 7, under the action of the thumb-nut 9, binds the lower end of the tube about the uplper end of a pipette 1() placed therein, as 1 ustrated in Fig.

The diameter of the roller 5 is such that it will flatten the tube and press the inner walls thereof close together on rolling over it, as shown in 3. Itis obvious from this construction. that on placing the pipette in a liquid and grasping the trough-shaped body and roller, respectively, between the thumb and fore-finger and moving the roller upwardly, the suction caused by this action will carry the liquid within the pipette. As the movement of the roller may be carried on veryslowly, the quantity of liquid sucked into the pipette may be gaged with precision. On moving the roller 5 in the reverse direction, the liquid in the pipette is ejected.

Although I have described the construction and nature of the invention in detail, it is obvious that the same may be variously modied; and I consider that I am entitled to such modifications as fall within the scope of the appended claims.

Having thus described my invention I claim as new and desire to secure by Letters Patent:

1. A pipette attachment comprising a body, a fieXible tube seated on said body, an expansible clamp formed at one end of said body for detachably clamping the tube to the pipette, and a device longitudinally movable over said tube acting` to flatten it against said body, for the purpose described.

2. A pipette attachment comprising a trough-like body composed. of a base and side flanges rigidly connected together, a fieXible tube within said body, and a device longitudinally movable over said tube, in guide- Ways provided in said flanges, acting to flatten the tube against said base.

3. A pipette attachment comprising a trouglblike body composed of a base with side flanges, the latter being provided with longitudinal slots, a fieXible tube within said body, and a roller having trunnions projecting into said slots movable over said tube and acting to flatten it against said body.

4. A pipette attachment comprising a trough-like body made of sheet metal and composed of a base having flanges at each side thereof, said flanges being provided with longitudinal slots, a flexible tube arranged adjacent to said base, and a lmurled roller having trunnions projecting into said slots acting when movedv over said tube, to flatten it against said base.

5. A pipette attachment comprising a trough-like body having a split clamp formed as an integral part at one end thereof,

e 'flexible tube Within said body passing` through said clamp for receiving' one end of a pipette, means for drawing the clamp together to bind the tube about the ipette,

and e device longitudinally inovab e oyen said tube acting to Hatten it against said body, for the purpose described.

in testimony whereof 1 have signed my I name to this specification in the presence of l two subscribing Witnesses.



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Clasificación internacionalB01L3/02
Clasificación cooperativaB01L3/021, B01L3/0213
Clasificación europeaB01L3/02C1, B01L3/02C