US 1786574 A
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Description (OCR text may contain errors)
A. G. M. MICHELL VISCOMETER Dec. 30, 1930.
Filed July 20. 1928 W am dh ATTORNEY Patented Bee 3:, ldlafi UNETEE ANTHONY G. M. MICHELL, OF MELBOURNE, AUSTRALIA vrsoozanrnn Application filed July 20,
This invention relates to an improvement in viscometers of the type described in Patent No. 1,398,878.
The viscometer disclosed in the patent referred to comprises two closely fitting parts,
namely a cup and a ball, the former constituting a seat for the latter. A film of fluid, the viscosity of which is to be measured. is placed in the cup before the ball is seated therein and the weight of the ball determines the time of operation of the instrument. The ball being of constant weight, the time of operation varies in direct proportion to the viscosity of the fluid under test.
The present invention has for its object to provide means whereby the same viscometer may be applied. to test fluids having a wide range of viscosities without the time of oper ation being in any case either inconveniently long or too short to enable a result of the required degree of accuracy to be obtained.
Further objects of the invention will appear from the following specification taken in connection with the drawings, which form a part of this application, and in which Fig. 1 is an elevational view, partly in section, showing a viscometer constructed in accordance with the invention, having a supplemental weight; and
Fig. 2 is a plan view of the supplemental weight.
The invention briefly described consists of a weight adapted for use in supplementing the Weight of the ball in a viscometer com- 05 prising a cup and ball, the weight being so constructed and arranged that it can be detachably carried by and supported on the ball.
Further details of the invention will appear from the following description.
In the embodiment of the intention illustrated, the weight 10 consists of an annulus of metal or other solid material. Its inner surface 12 fits the ball 13 in such manner that when the viscometer is suspended for making a test, as shown in Fig. 1 and as described in the cited patent the ball adhering to the cup 14 by means of the film 15 of the fluid under test, the annular weight is supported upon 1928. serial No. 294,202.
the ball and its center of gravity coincides approximately with the center of the ball.
In the preferred form shown in the drawing, the peripheral surface 16 of the annulus is cylindrical and the upper and lower surfaces 17 and 18 flat, the thickness of the annulus being less than the diameter of the ball, wnile the internal surface 12 is conical, being atthe lower end of greater, and at the upper end of less diameter than the ball whereby the ball is unable to pass through the annulus.
The apical angle of the conical surface is preferably about 30, so that the ball may be temporarily and detachably affixed in the annulus by their frictional contact, and the ball and annulus together may be temporarily manipulated as one piece in the operation of making a test as described in the cited patent.
The weight of the annulus is preferably an integral multiple of the weight of the ball, it being desirable that the period of time during which the ball is held suspended and the period of time during which the ball and weight are held suspended should bear a simple numerical relation to one another.
Although one specific embodiment of the invention has been particularly shown and described, it will be understood that the invention is capable of modification and that changes in the construction and in the arrangement of the various cooperating parts may be made without departing from the spirit or scope of the invention, as expressed in the following claims.
lVhat I claim is:
1. A viscometer comprising a cup and a ball having interfitting surfaces, said cup having a handle connected thereto, and a supplemental weight detachably carried by the ball and supported directly thereon.
2. A viscometer comprising a cup and a ball having interfitting surfaces, and a sup plemental weight detachably carried by the ball and supported thereon said supplemental wei ht having a tapered opening therethrough, the smaller end of the opening hav- Iiangla diameter less than the diameter of the 3. A viscometer comprising a cup and a ball having interfitting surfaces, and an annular weight adapted to surround the ball and to be supported directly thereon.
4. A viscometer comprising a cup and a ball having interfitting surfaces, an annular weight surrounding and detachably aflixed to the ball, and having its center of gravity substantially coincident with the center of said ball.
5. A viscometer comprising a cup and a ball having inter-fitting surfaces, an annular weight adapted to be attached to the ball of the viscometer by engagement of the inner surface of the weight with the surface of the ball.
6. A viscometer comprising a cup and a ball having inter-fitting surfaces, and an annular weight having a conical inner surface tapering from a diameter greater than the diameter of the ball. of the viscometer to a diameter less than the diameter of said ball whereby the Weight may be supported from the ball when the ball is inserted in the conical opening of the weight.
In witness whereof, I have hereunto set my hand this 18th day of July, 1928.
ANTHONY G. M. MIGHELL.