Invention Grant
- Patent Title: Hydraulically powered door and systems for operating same in low-temperature environments
- Patent Title (中): 液压动力门和在低温环境下运行的系统
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Application No.: US11735833Application Date: 2007-04-16
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Publication No.: US07665930B2Publication Date: 2010-02-23
- Inventor: William R. Kennedy , John M. Kennedy
- Applicant: William R. Kennedy , John M. Kennedy
- Applicant Address: US IL Taylorville
- Assignee: Kennedy Metal Products & Buildings, Inc.
- Current Assignee: Kennedy Metal Products & Buildings, Inc.
- Current Assignee Address: US IL Taylorville
- Agency: Senniger Powers LLP
- Main IPC: E05F15/00
- IPC: E05F15/00 ; E21D9/06

Abstract:
A hydraulic system has a hydraulic actuator for moving a door leaf of a door installation between open and closed positions thereof. A reservoir has a volume for containing a hydraulic fluid. A fluid circuit provides fluid communication between the hydraulic actuator and the reservoir. The system also has a pump for pumping hydraulic fluid from the reservoir into the fluid circuit to operate the actuator. A fluid circuit flushing system of the hydraulic system operates to flush a volume of hydraulic fluid from the fluid circuit back to the reservoir without moving any door leaves of the door installation. The hydraulic system may be part of a mine door installation installed in a mine passageway and having at least one door leaf. The hydraulic actuator is connected to the door leaf for driving movement of the door leaf between its open and closed positions.
Public/Granted literature
- US20080253841A1 HYDRAULICALLY POWERED DOOR AND SYSTEMS FOR OPERATING SAME IN LOW-TEMPERATURE ENVIRONMENTS Public/Granted day:2008-10-16
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