| 摘要 |
An apparatus for displacing a high viscous substance, such as grease, which comprises a positive displacement-type pump. The chamber of the pump is in communication with a second chamber defined by a tubular sleeve that is slidably displaceable on the body of the pump, thereby rendering the volume of the second chamber variable and, as such, providing for effective displacement of grease into the chamber of the pump via a valve arrangement. A closure member is disposed to control charging of the second chamber with grease and the displacement of such grease from the second chamber into the chamber of the pump. Also, simultaneously with the charging of the chamber the pump can displace grease therefrom for lubricating or other applications.
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