Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Hydraulic shield support










Image Number 5 for United States Patent #7237983.

A hydraulic shield support is disclosed with at least two adjustable-length hydraulic props supporting a dedicated shield, which are connected through a control bank to a hydraulic fluid supply and borne on base shoes, and to which a pressure in excess of the pressure of the hydraulic fluid may be applied in the set condition of the shield support. In order to provide almost any pressure level at each shield support at a deep face in a simple way, the shield support has at least one pressure intensifier located in a hydraulic pipe system between the hydraulic fluid supply and the hydraulic props, with an oscillating intensifier piston in the form a differential piston effecting the increase in pressure. The low pressure inlet of the pressure intensifier is connected to the setting pressure pipes upstream, and its high-pressure outlet downstream, of a hydraulically-releasable non-return valve.








 
 
  Recently Added Patents
Testing SQL query writing skills
Sink
High damage threshold frequency conversion system
Vehicle battery with cell balancing current paths and method of charging the same
Adhesive structure of optical device, adhesion method, and optical pickup device
Image generation device with optimized dose control
Method and apparatus for coordinating hopping of resources in wireless communication systems
  Randomly Featured Patents
Wafer boat and boat holder
Mannich detergents for hydrocarbon fuels
Flexibly embedded disc screen
Wavelength-division-multiplexing cross-connect using angular dispersive elements and phase shifters
Optical head device and optical information recording/reproducing apparatus
Handling collisions during synchronization of data between client and server computers
Wireless service points having unique identifiers for secure communication
Wagering game where player can borrow money for wagers based on equity position
Electromagnetic flowmeter having a detachable measuring tune from the body
Apparatus and method for detecting ink in a reservoir using an overdriven thermistor and an electrical conductor extending from the thermistor