Resources Contact Us Home
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
Method for fabricating solar cell
Non-aqueous solution process for the preparation of cross-linked polymers
Wireless communication apparatus, a method of wireless communication, and a program for wireless communication
Keypad assembly for electronic devices
Image processing apparatus and image processing method
Wireless communication system, associated methods and data structures
Method and device for accessing the documentation of an aircraft according to alarms generated therein
  Randomly Featured Patents
Article with organic-inorganic composite film and process for producing the same
Single reduction drill
Piston for tilt and trim unit of outboard drive of marine propulsion unit
Surface treating methods
Thermal triggering mechanism having a glass ampoule for aerosol fire extinguishers
Sight tube assembly and sensing instrument for controlling a gas turbine
Sublimation thermal transfer printing sheet comprising novel magenta dyestuffs
Amide and sulfonic acid derivation of lower olefin oligomers
Cysteine (NPYS)-containing peptides and use thereof for inhibiting platelet aggregation
System and method for managing contacts within an online stationery system