Ling Zhang

20060278660, Dec 14, 2006

Jun 8, 2005

11/147205

Ling Zhang - Rowland Heights CA, US

G01F 11/00

222262000, 222333000

A shoulder supported, hand directed automotive grease gun in which a reciprocating piston transfers fluid from a supply tube to an outlet conduit. A battery powered motor and gear transmission rotate a disc on which is mounted an eccentric pin. The pin forcibly moves a piston holder between low friction parallel guides so as to advance the piston with its transferred fluid toward the outlet conduit. A first spring constantly biases the piston holder toward the pin so that the piston reciprocates rapidly as the disc rotates. An adjustable spring-loaded ball seal unit with an adjustable spring seat controls flow of the fluid. A fluid supply tube heating device alters fluid density to also control fluid flow. An auxiliary shoulder strap relieves pressure on an operator's wrist and transfers backpressure and tool weight to the operators body.

20070081902, Apr 12, 2007

Sep 28, 2006

11/536049

Ling Zhang - Rowland Heights CA, US
Ning Zhang - Taicang City, CN

F04B 49/10
F04B 49/06

417032000, 417044200

A digital air compressor control system is for creating a customized air compressor. The system includes microprocessor, power supply, electric sensors and electric valve. In general, digital control system includes four overall components, which may be present in a variety of electric-mechanical formulations. The first component is the microprocessor. It controls the system's or component's action. It receives signals and sends out action commands according to user requirements. Microprocessor directs most every component action. The second component is power control system. Under microprocessor control, the power control system can supply or stop supplying current to electric components allowing accurate functionality. The next component is sensors. They include pressure sensors and temperature sensors. The pressure sensor picks up the pressure data from the control pressure area. The sensor sends the signal to the microprocessor for processing, and issues appropriate commands that the designer programmed or that the user preset. The temperature sensor function is similar to the pressure sensor, one difference is that the signal comes from the control temperature area. The microprocessor receives these signals and sends commands to control power on or off; motor run or stop; valve open or close. Another component is the electric valve. These valves follow the microprocessor command to either open or close to allow the air tank to reach preset pressure. It also releases tube pressure air from the pump to tank.