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
Position and orientation measurement apparatus, position and orientation measurement method, and storage medium
Amplitude-shift-keying (ASK) envelope detector and demodulation circuits
System and methods for random parameter filtering
Method and system for shared high speed cache in SAS switches
Semiconductor device having germanium active layer with underlying parasitic leakage barrier layer
Method and apparatus for optimizing paging in a communication network
Valved, microwell cell-culture device and method
  Randomly Featured Patents
Limit switch
Facsimile receiving apparatus
Plug connector
Automatic bank note transaction system
Stairtread for spiral staircase
Nylon 6 with improved wear life
Capacitive acceleration sensor
Rolling mill with laterally different velocities
Installation bundle with spacer
Parallel starting system having a low wiring expenditure