US 3154294 A
Description (OCR text may contain errors)
Oct. 27, 1964 D. L. BITTNER 3,154,294
TITRATING AND MIXING APPARATUS Filed Oct. 17. 1960 2 Sheets-Sheet 1 Fig. I.
IN VEN TOR.
Donald L. Biflner Away/Mm Oct. 27, 1964 D. L. BITTNER 3,154,294
' TITRATING AND MIXING APPARATUS Filed Oct. 17, 1960 2 Sheets-Sheet 2 Fig.4.
c l 4 I A I I I i Z INVENTOR.
Donald L. Biflner BY fwd m United States Patent 3,154,294 TITRATENG AND MIXING APPARATUS Donald L. Bittner, 2200 Hayes, San Francisco 17, Calif. Filed Get. 17, 1960, Ser. No. 63,933 1t) Claims. ((31. 259-12) This invention relates to a rotatable turntable which is adapted to carry a beaker which is adjustable in elevation relative to a metering stern used to meter fluid to the beaker and to act as a stirring mechanism for fluid contained within the beaker.
In laboratory practice it is often desirable to meter precise quantities of liquid into a vessel or beaker. It is then necessary to stir the fluid Within the beaker to obtain complete dispersion or mixing therein. It has been found, however, that the introduction of stirring rods frequently contaminates the fluid. This constitutes a particular problem Where relatively precise purities and mixtures are required.
The device of this invention constitutes a turntable which is mounted below a fluid metering rod. The turntable is provided with means for imparting controlled rates of rotation so that the beaker supported on the turntable can be rotated at at least two different rates of rotation. The turntable is further movable in elevation so as to clear contact with the metering rod in the lower position and to raise to the upper position where the metering rod can make physical contact with the liquid thus functioning as a stirring device due to the relative motion between the rotating beaker and the relatively fixed metering rod.
One of the features and advantages of this invention is to provide a turntable which will rotate smoothly without the introduction of undue vibration so that the mixed fluid will not be unduly disrupted during the mixing or stirring process.
Another feature and advantage of this invention is that the device can be used with a conventional titrator in such a way that the titrating tube can function to meter fluid from the tube into the beaker supported on the turntable of the device and thereafter the turntable can be raised to a position where the titrating tube engages the liquid within the beaker thus allowing the titrating tube to function as a stirring rod due to the relative motion between the rotating beaker and the fixed titrating tube.
Another object of this invention is to provide a novel mechanism which will allow a turntable to be locked at a lower, upper and intermediate position with a combination of a frictional drive arran ed to engage the turntable throughout each of the respective positions and in which the relative ratio between the frictional drive and the rim of the turntable is such that the turntable rotates at a different rate of speed in the upper position than in the intermediate position.
A further object of this invention is to provide a novel disengaging mechanism which allows the disengagement of the turntable with the rotating mechanism during the intervals that the turntable is being moved between its upper and lower positions.
Other objects of the present invention will become apparent upon reading the following specification and referring to the accompanying drawings in which similar characters of reference represent corresponding parts in each of the several views.
In the drawings:
FIG. 1 is a top plan view of the turntable device of this invention.
FIG. 2 is a cross-sectional view of FIG. 1 taken at line 22.
FIG. 3 is a cross-sectional view of FIG. line 33.
FIG. 4 is a cross-sectional view similar to FIG. 2 show- 1 taken at ice ing the turntable and its actuating arm in two positions of operation one of which is represented by the dotted lines.
FIG. 5 is a fragmentary view showing the turntable with a beaker mounted thereon and a metering rod shown in position relative to the beaker.
In the principal embodiment of the invention the beaker support turntable device is mounted in a rectangular housing generally indicated at A. Actuating arm mechanism B is mounted on housing A and adapted to carry a turntable 15. The turntable is rotated by a rotating mechanism generally indicated at C and which is similarly mounted on housing A.
The rotating mechanism comprises a motor 29 mounted in the interior of housing A. The motor is arranged to rotatably drive a vertical shaft 21. A frictional drive capstan 22 is mounted on the end of shaft 21. Capstan 22 is formed with a lower enlarged segment 23 and an upper segment 24 of substantially reduced diameter.
Actuating arm mechanism B includes a horizontally mounted arm 29 mounted on a shaft or stem 31. Shaft 31 is rotatably and slidably mounted within a bearing 32 carried by the underside of the top wall 35 of housing A.
Turntable 15 is pivotally mounted on a shaft 36 mounted on the end of arm 29.
The lower portion of stem 31 is provided with a pin 4t) which is afiixed to the bottom end of the stem. A spring 42 is mounted to the pin and to a fixed vertical rod 44- mounted on the bottom 4-5 of housing A.
Spring 42 functions to bias actuating arm 29 to move turntable 15 against capstan 22. By this mechanism the peripheral edge of the turntable is biased against the capstan so that the rotary motion of the capstan is frictionally imparted to the turntable.
An actuating mechanism supporting column D is mounted on the upper face of top wall 35. Column D is provided with three faces or collars 50, 51 and 52. The collars are arranged to form a support for the underside of arm 29 and are arranged in position so that spring 42 biases arm 29 in a position overlying the respective collars 51} through 52. The end of actuating arm 29 opposite turntable 15 is provided with an actuating handle 60.
In operation turntable 15 is adapted to receive a beaker or vessel generally indicated at E. A titrating or metering device F is arranged above the turntable so that when beaker E is placed on turntable 15 the metering device, which has a depending metering tube 62, is arranged with the tube depending into the internal area of the beaker. Normally tube 62 will remain at a substantially fixed elevation.
The device in the first phase of operation is operated by moving actuating handle 60 in a clockwise direction and lowering actuating arm mechanism B to a position where the actuating arm is arranged to rest on the lower face 50 of column D. During the lowering movement turntable 15 is disengaged from capstan 22 so that the entire arm mechanism is free to move vertically without the impedance of the rotating structure interfering with the vertical movement.
Spring 42 is slidably mounted on rod 44 so that the spring can slide with stem 31 downwardly to its lower position on the rod 44. Actuating handle 60 is then released so that turntable 15 can engage the lower section 23 of capstan 22. Column D between faces 50 and 51 in the area as indicated at is formed of sufficiently reduced diameter so that there is no impedance against spring 42 fully biasing turntable 15 against capstan 22.
Actuating handle 60 is then moved in a clockwise direction sufficiently to cause a disengagement of the capstan from the turntable.
Beaker E is then mounted on turntable 15. The beaker should be selected of a sufiiciently short length so that the beaker may be placed on the turntable with the top of the beaker being substantially below the bottom tip of metering tube 62. If desired the beaker may be dry or alternatively may contain a predetermined quantity of solution.
Actua'ting handle 64? is then released so that the beaker is rotated by the action of the turntable. Titration or metering from tube 62 then is effected in the normal fashion by causing the requisite amount of material to be metered from the tube. Actuating handle 6t) is then moved in a clockwise direction and actuating arm mechanism B is raised to its intermediate position resting on face 51. In this position metering tube 62 may be sub merged in a portion of the liquid contained within beaker or vessel E.
Turntable is eccentric so that the axis of rotation will be varied with the rotation of the turntable thus causing the beaker to move laterally as well as rotatably relative to metering tube 62.
The actuating handle is then released thereby causing the beaker to rotate. The relative motion between the rotating beaker and fixed metering tube 62 provides a stirring mechanism causing the liquid within the beaker to be raised. Subsequently actuating handle 60 again is moved clockwise and the actuating arm moved up to a position Where the arm will overlie face 52. In this position turntable 15 is arranged to engage the smaller diameter segment 24 of capstan 22. This causes the turntable to rotate at a slower rate due to the fact that the driving capstan is of smaller diameter. The speed of rotation of turntable 15 thus is determined by selectively positioning actuating arm mechanism B on either upper face 52 or intermediate face 51. This control is desirable in that in some solutions it may be desirable to rotate the fluid at a slow rate relative to the stirring rod while in other solutions a faster rate of rotation may be required.
It is believed obvious that the method of using this device may vary. For example the fluid from tube 62 may be metered into beaker E while the tube is below the liquid level within the beaker and during a rotating condition. It is also believed obvious that the rotation of the turntable can be stopped in any position of the device by simple moving actuating handle 60 slightly in the clockwise direction. Thus a fixed turntable or rotating turntable condition in any of the three elevations can be maintained.
Although the foregoing invention has been described in some detail by way of illustration and example for purposes of clarity of understanding, it is understood that certain changes and modifications may be practiced within the spirit of the invention as limited only by the scope of the appended claims.
What is claimed is:
1. A device for supporting a vessel relative to a fluid metering stem so that the vessel may be rotated at selected elevations relative to said stern comprising a vertical capstan, means to rotate said vertical capstan,
a vessel supporting turntable,'an arm, means pivotally' mounting said turntable on said arm, means pivotally mounting said arm for pivotal movement in a horizontal plane and for slidable vertical movement, spring means biasing said arm to move said turntable against said capstan to impart the rotary motion of said capstan to said turntable, means to move'said arm in a direction against the spring biasing force to move said turntable away from said capstan, and support means having at leasttwo arm supporting faces disposed at different elevations to alternatively'support said arm against downward movement when said turntable is located against said capstan and to be freed of arm supporting engagement when said arm is moved to position said turntable away from engagement with said capstan.
2. A device according to claim 1 and wherein said capstan is formed with a first section and a second section, the first section of said capstan being of larger diameter than the second section, and said arm supporting faces being at selected elevations to allow said turntable to be alternatively aligned in horizontal registration with the first and second faces of said capstan.
3. A device according to claim 1 and wherein said vessel supporting turntable is eccentric in configuration.
4. A device for supporting a vessel relative to and in registry with a fluid metering stem so that the vessel may be rotated at selected elevations relative to the stem comprising an arm, a shaft depending from said arm at a position intermediate the ends of said arm, bearing means pivotaily mounting said shaft for slidable vertical movement, a vessel supporting turntable mounted on the top of a first end of said arm, a vertical capstan, means rotatably mounting said capstan at a position adjacent the outer edge of said turntable, handle means mounted on the second end of said arm by which said arm can be moved to position said turntable in a first position in engagement with the capstan and in a second position out of engagement with said capstan, spring means connected to said arm and spring biasing said arm in the first position, and a column member mounted adjacent said arm, said column member having a plurality of collars, each said collar being positioned to support said arm against downward movement when said arm is in the first position and not in the second position whereby said arm may be moved to the second position to be slidably moved for engagement with a selected one of said collars.
5. A device for supporting a vessel relative to and in registry with a fluid metering stem so that the vessel may be rotated at selected elevations relative to the stem comprising an arm, a shaft depending from said arm at a position intermediate the ends of said arm, bearing means pivotally mounting said shaft for slidable vertical movement, a vessel supporting turntable mounted on the top of a first end of said arm, a vertical capstan having a first and second portion of different diameters, means rotatably mountingsaid capstan at a position adjacent the outer edge of said turntable, handle means mounted on the second end of said arm by which said arm can be moved to position said turntable in a first position in engagement with the capstan and in a second position out of engagement with said capstan, spring means connected to said arm and spring biasing said arm in the first position, and a column member mounted adjacent said arm, said column member having a plurality of collars, each said collar being positioned to support said arm against downward movement when said arm is in the first position and not in the second position, one of said collars being positioned to align said turntable with the first portion of said capstan and another of said collars being positioned to align said turntable with the second portion of said capstan whereby said arm may be moved to the second position to be slidably moved for alternative engagement with one or the other of said collars.
6. A device for supporting a vessel relative to and in registry with a fluid metering stem so that the vessel may be rotated at selected elevations relative to the stem comprising a rotatably mounted vessel supporting turntable, means to vertically move said turntable toward and away from said stem, locking means to lock said turntable at a position where the top of said vessel is below the bottom of said stem and at a second position at which the stem is below the liquid level within the vessel, means to rotate said turntable in the first and second positions, and clutch means operable to disengage the rotating means from said turntable while said turntable is in said first and second positions and during the interval when said turntable is moved between said first and second positions.
7. A titrating system comprising atitrator having a vertical depending fluid metering stem, a turntable mounted under said stem adapted to carry a fluid containing vessel, means to move said turntable to a position where the fluid level carried within the vessel is slightly below the tip of said stem and to a second upper position where the tip of the stem extends into the fluid carried by the vessel but is spaced above the bottom of the vessel, and means to rotate said turntable in both said first and said second positions.
8. An improved titrating system comprising a fluid metering stem, a turntable mounted under said stem adapted to carry a fluid containing vessel, means connected to vertically locate said turntable and metering stern relative to one another at a first position wherein the surface of fluid carried within the vessel is below the tip of said stem and a second position wherein the tip of said stem extends into the fluid carried by the vessel, and means connected for rotating said turntable relative to said stem.
9. In the titrating system of claim 8, the rotating means including an eccentric means connected to rotate the turntable in an eccentric motion.
10. A device for supporting a vessel relative to and in registry with a fluid metering stem so that the vessel may be rotated at selected elevations relative to the stem comprising a rotatably mounted vessel supporting turntable, means connected to locate said turntable at selected relative elevations, and drive means connected to rotate said turntable at each selected relative elevation.
References Cited in the file of this patent UNTTED STATES PATENTS 674,849 Wiser May 21, 1901 1,772,083 Hollenback Aug. 5, 1930 2,438,264 Bender Mar. 23, 1948 2,556,490 Chamberlin June 12, 1951