Browse Prior Art Database

Simulated Breath Drive Mechanism and Waveform Control

IP.com Disclosure Number: IPCOM000079402D
Original Publication Date: 1973-Jun-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Bartlett, RG: AUTHOR [+3]

Abstract

This mechanism is disposed within the Breathing Metabolic Simulator sub-system 10, which is described in the IBM Technical Disclosure Bulletin, Vol. 16, No. 1, June 1973, pages 320 and 321. This mechanism controls expansion and contraction of a bellows 14 to (a) draw air from a simulated trachea, not shown, and (b) expel air to a temperature/humidity subsystem 15 within which the trachea is located. The motion of the bellows is independently variable in rate, magnitude of periodic motion, and minimum volume. The periodic motion of the bellows 14 is accomplished by a bellows' drive motor 11, operating a crankshaft connecting rod combination 40 through a 30:1 gear reduction. The drive motor's speed is varied by a motor controller 41.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 2

Simulated Breath Drive Mechanism and Waveform Control

This mechanism is disposed within the Breathing Metabolic Simulator sub- system 10, which is described in the IBM Technical Disclosure Bulletin, Vol. 16, No. 1, June 1973, pages 320 and 321. This mechanism controls expansion and contraction of a bellows 14 to (a) draw air from a simulated trachea, not shown, and (b) expel air to a temperature/humidity subsystem 15 within which the trachea is located. The motion of the bellows is independently variable in rate, magnitude of periodic motion, and minimum volume. The periodic motion of the bellows 14 is accomplished by a bellows' drive motor 11, operating a crankshaft connecting rod combination 40 through a 30:1 gear reduction. The drive motor's speed is varied by a motor controller 41.

Long-term variations, greater than one crankshaft revolution, correspond to changes in breathing rate. Short-term variations, within one crankshaft revolution, correspond to changes in breath waveform and are varied by the individual settings of twelve waveform controls on the motor control unit. Each control is effective during 1/12 of a crankshaft revolution, as determined by a 12- position switch 42.

Connecting rod motion is transmitted to the bellows 14 by a lever arm 43 operating on a movable fulcrum 44. Fulcrum motion along the lever arm 43 varies the lever arm ratio corresponding to changes in breath depth. This motion is accomplished by a lead screw from the fulcrum drive motor 12. Fulcrum motion normal to the lever arm 43 (i.e., moving the position of the bottom of the bellows 14 for a fixed crank position and lever arm ratio) will change the minimum bellows volume obtainable through periodic motion. Thi...