Resources Contact Us Home Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE     Precision material filling systems Image Number 2 for United States Patent #4450981. The filling systems according to the invention utilize pneumatic pressure maintained within closely held tolerance limits to impose a constant dispensing force upon the material being dispensed. The invention in one embodiment utilizes a buffer tank system in which the product to be dispensed is transferred from a supply tank (11) to the buffer tank (12) where the desired pressure is induced through a pneumatic head which is introduced above the product level. The product level in the buffer tank (12) is allowed to fluctuate within a relatively narrow band of depth so as to negate the effect of changes in gravity head pressure. The closed and pressurized system is refilled by forcing the incoming product into the tank (12) under a higher pressure than that in the buffer tank (12). The air within the tank (12) that is displaced as a result of introducing the new product is automatically vented to atmosphere through a precision regulation system (45).The pressure balancing system incorporates either a piston or diaphragm balancing member controller device (81) which controls a three-way pneumatic valve (72) for charging or venting the dispensing tank (58). The desired product set point pressure is applied to one side of the balancing member (80) and the actual product pressure is applied to the other side. As the level in the tank (58) drops, the gravity head pressure drops, and this is sensed at the bottom of the tank. The balancing member (80) favors the side with the lower pressure causing the three-way valve (72) to open and pneumatically charge the tank (58) until the set point pressure and the actual prodcut pressure are equal. If the actual product pressure becomes greater than the set point pressure (72) to exhaust the excess pressure to atmosphere. The response time and sensitivity of the system are adjusted by a flow control valve (68) in the charging circuit, and by increasing or decreasing the pressure differential between the charging pressure and the set point pressure.       Recently Added Patents Sheet feeder having movable supporter for supporting sheets stacked on a sheet tray and image recorder having the same Electronic sweepstakes system providing multiple game presentations for revealing results from a single sweepstakes game Methods and apparatus for a suspension system with progressive resistance Remote control for television receivers Optical structure, in particular for a security document and/or a document of value Trust event notification and actions based on thresholds and associated trust metadata scores Method, device and system for detecting the mobility of a mobile device   Randomly Featured Patents Data output apparatus and data output method Luminaire Support point for an overhead conductor Carbon fiber doctor blade Laser light quantity control device Online collaborative apprenticeship Variable preload ball drive Metal-on-metal capacitor with conductive plate for preventing parasitic capacitance and method of making the same Stabilization of color in production of paracumylphenol using hypophosphorous acid Variable bit rate speech encoder © 2006-2008 PatentGenius. All Rights Reserved.