Drip counter apparatus

• US 5,982,289 A
• Filed: 09/25/1998
• Issued: 11/09/1999
• Est. Priority Date: 09/25/1998
• Status: Expired due to Fees

• Current Assignee: Smiths Aerospace Actuation Systems-Yakima Incorporated
• Original Assignee: Dowty Aerospace Yakima
• Inventors: Durnan, Nathaniel E., Kingsley, Robert B.
• Primary Examiner(s): Hofsass, Jeffery A.
• Assistant Examiner(s): TRIEU, VAN THANH
• Application Number:
  US09/160,966
• Time in Patent Office: 410 Days
• Field of Search: 340/602, 340/606, 340/609, 73/861.41, 250/574, 250/575, 250/577, 604/253
• US Class Current: 340/609
• CPC Class Codes: A61M 5/1689 Drip counters

Abstract

In apparatus for counting a succession of falling liquid drops having teardrop shape, with a downwardly convex down side, the combination that includes a beam provider for providing a beam of electromagnetic radiation to sidewardly pass into the drop at its convex lower side, to be refracted within the drop to pass out of the drop at its convex lower side, and a beam detector located to detect the refracted beam that has passed sidewardly out of the drop at its convex lower side.

Claims

1. In apparatus for counting a succession of falling liquid drops having teardrop shape, with a downwardly convex lower side, the combination that includes

a) a beam provider for providing a beam of electromagnetic radiation to sidewardly pass into the drop at its convex lower side, to be refracted within the drop to pass out of the drop at its convex lower side,

b) and a beam detector located to only detect the refracted beam after it has passed sidewardly out of the drop at its convex lower side,

c) and wherein the beam provider and detector are located to respectively provide and receive the beam along respective axes located below a drop maximum width zone, said axes forming an acute angle therebetween, whereby the beam remains undetected in the absence of drop passage through the beam.

2. The apparatus of claim 1 wherein, said beam provider is located to direct the beam into the drop below said maximum width zone.

3. The apparatus of claim 1 wherein the beam provider is configured to provide an infra-red beam.

4. The apparatus of claim 2 including a drip supply conduit having a drip outlet located above the line of the beam passing into and out of the drop at predetermined angularity, below said maximum width zone of the falling drip.

5. The apparatus of claim 4 wherein said drip conduit has goose neck configuration.

6. The apparatus of claim 5 including a carrier body carrying said drop conduit, said body defining a slot in which said conduit is received, said body also carrying said beam provider and beam detector below the level of said conduit outlet.

7. The apparatus of claim 6 wherein said body has a downwardly extending drip passage in which the drip may freely fall in a zone defining a vertical axis, said beam provider and detector being located to respectively provide and receive the beam along respective axes directed toward said zone.

8. The apparatus of claim 7 wherein said axes define an angle α

therebetween, where α

<

90°

.

9. The apparatus of claim 8 wherein said beam provider provides an infra-red beam.

10. The apparatus of claim 1 wherein said axes define an angle α

therebetween, where α

<

90°

.

11. The apparatus of claim 10 wherein said beam provider provides an infra-red beam.