Browse Prior Art Database

Buffer Level Sensing Unit

IP.com Disclosure Number: IPCOM000088225D
Original Publication Date: 1977-May-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Kropa, WT: AUTHOR

Abstract

The present arrangement comprises an economical and efficient means for sensing the degree of fullness of liquid-filled bags such as are used in connection with blood processing, transfusions and the like.

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Buffer Level Sensing Unit

The present arrangement comprises an economical and efficient means for sensing the degree of fullness of liquid-filled bags such as are used in connection with blood processing, transfusions and the like.

This arrangement provides a plurality of different indications indicating the degree of fullness of the container which it monitors. As shown in Fig. A, a bag 3 is suspended from a hook arm 5, which rotates about a pivot 7 which in turn is attached to a bracket or support (not shown). It will be apparent that the downward force on the right end of arm 5 is proportional to the amount of fluid remaining in the bag 3. This force is retransmitted via a connecting link 9 to a lever arm 11 in the base of the apparatus. A suitable compression spring 13, the force of which can be adjusted by means of a set screw 15, bears upon the arm 11 in such way that it neutralizes the upward force caused by the weight of bag
3. Arm 11 pivots about a pivot point 17 so that as the arm 11 rotates about pivot 17 a vane 19 is moved in the vertical direction. Vane 19 is made of suitable transparent material and carries thereon an opaque mask formation 21.

As shown in Fig. B, a pair of photosensitive detectors are arranged so that the light thereto from light sources, such as LS1 and LS2, are interrupted by the opaque mask 21 at various times during the travel of the lever arm 11. The presence or absence of light from the sources LS1 and LS2 is detected by the p...