US2097571A - Pipette - Google Patents

Description

Nov. 2, 1937. J, J MORAN 2,097,571

Filed Aug. 26, 1935 INVENTOR I JHMES J. MoRHIV ATTORNEY Patented Nov. 2, 1937 UNITED STATES PATENT oFFiE PIPETTE James J. Moran, Drexel Hill, Pah, assignor to Kimble Glass Company, Vineland, N. J a corporation of Illinois Application August 26,1935, Serial No. 37,907

1 Claim.

This invention relates to pipettes and has as a primary object the provision of means for protecting a pipette against breakage during use of the pipette in transferring samples to test bottles.

A further object of this invention is to provide protecting means of the above mentioned character which will be simple in construction and which will render the pipette more easy to use.

Numerous other objects and advantages of this invention will become more apparent as the following description proceeds particularly when reference is had to the accompanying drawing wherein Fig. 1 is a perspective view of a pipette showing the invention applied to the same, the pipette 5 wherein like reference characters designate corresponding parts throughout all views, the numeral l 3 designates generally a pipette. This pipette is of general construction in that it includes a discharge stem ll, an enlarged body portionlZ, and a tubular extension I3 formed on the upper end of the body portion, this extension being provided with the usual line l4 indicating the level to which the pipette should be filled. As is customary, the lower end of the. body portion l2 of the pipette is of conical shape adjacent its juncture with the stem H.

The numeral [5 designates generally a test bottle of usual construction, this bottle including a body portion [6 and an elongated neck portion ll provided with suitable graduations it. The neck portion terminates at its open end in an outwardly flared portion I9 to facilitate the insertion of the stem of the pipette into the test bottle.

In use, it will be understood that the pipette is adapted for the transferring of samples to be tested to the test bottle. Thus for example, in the Babcock test for determining the cream in milk or the butterfat in cream, the desired quantity of the milk or cream to be tested is trapped in the pipette and. then the pipette stem is inserted in the neck of the test bottle as illustrated in Fig. 1 and the sample allowed to flow from the pipette into the test bottle. Hereto-fore difiiculty has been encountered in making this transfer with any degree of rapidity because of the danger of breaking the pipette stem and the neck of the test bottle. The present invention therefore contemplates the provision of protecting means in the nature of a washer adapted to embrace the lower end of the body of the pipette and the adjacent portion of the pipette stem, which washer will cushion the contact of I the pipette with the test bottle neck.

Referring now particularly to Figs. 2, 3 and 4, the numeral 25 designates generally a washer adapted to be associated with the pipette in the manner above'indicated. It will be noted that this washer has a lower annular portion 2! adapted to embrace the pipette stem adjacent the point where this stem merges into the pipette body. The washer is'also provided with asubstantially conical recess 22 of a size and shape I T to snugly engage the lower portion of the pipette,

body adjacent the pointwhere the body merges into the pipette stem. Exteriorly, the washer is provided with an annular enlarged rim'25, while H the sides of the washer below this rim are provided with ribs 26 to provide spaced grooves 27 i as clearly illustrated in Fig. 3 of the drawing.

It will be understood that the washer 25) .is

associated with and becomes in substance a permanent part of the pipette. if desired the" washer may be rigidly secured in position as by cementing or gluing the same to the" pipette, al-

though preferablythe washer is removably'held in position by virtue of its snug frictional engagement with the pipette. In the'latter case, it will i be understood that the washer may be removed from the pipette when it is desired to washthe pipette.

The washer is formed of some yieldable'material such as rubber and in use emciently cushions the contact of the pipette stem. and body with the neck of the test bottle.

escape of air trapped in the test bottle.

economical and effective protecting means for the pipettes and test bottles.

While the invention has been described with some detail, it. is to be understood that the description is not definitive of the limits of the inventive idea and that the right is reserved to;

make such changes in the details oi construction as will fall within the purview of the attached claim. I

What I claim as my invention is; A cushioning member for useon pipettes of the The ribs 26 of the washer engage the flared portion of the test. bottle neck while the grooves 27 provide for the The fluted washers may be economically produced and easily applied to pipettes and thus constitute'an surface to fit said tapered end and having an outer substantially conical surface with a plurality of flutes thereon, said conical surfaces converging in the same direction.

JAMES J. MORAN.

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