Resources Contact Us Home
Mine roof support and attachment means therefor

Image Number 3 for United States Patent #4605341.

Attachment means are provided for attaching a mine roof support to an abutment, (e.g. a flexible conveyor) the attachment means comprising a ram arrangement in the form of at least two rams 25, 26 operable to effect relative movement between the mine roof support and the abutment. The provision of two or more rams instead of the conventional single ram means that smaller bore rams may be used, for example a 60 mm bore as opposed to 41/4 inch bore and this makes it possible to cover or encase the rams in a protective shield without reducing the vertical space available to a miner underneath the mine roof support.

  Recently Added Patents
High brightness laser diode module
Spalling utilizing stressor layer portions
Catecholic butanes and use thereof for cancer therapy
Hand sign
Methods and system for providing drug pricing information from multiple pharmacy benefit managers (PBMs)
Protection circuit, substrate for electro-optical device, electro-optical device, electrophoretic display device, electronic apparatus, and manufacturing method of electro-optical device
Device and implantation system for electrical stimulation of biological systems
  Randomly Featured Patents
Optical sensor configuration for ratiometric correction of blood glucose measurement
Method for controlling the electron current in an x-ray tube, and x-ray system operating according to the method
Group III nitride LED with undoped cladding layer
Benzenesulfonylurea derivatives
Cyanohydrination process
Tattoo utility cart
Porous, film, wiring structure, and method of forming the same
Process for producing polycrystalline oxide fibers
Apparatus and methods for identifying and processing mail using an identification code
Exercise device with varied gait movements