Mine roof supporting structure

• US 3,240,021 A
• Filed: 07/20/1962
• Issued: 03/15/1966
• Est. Priority Date: 07/22/1961
• Status: Expired due to Term

• Current Assignee: Michel Lablache-Combier, Michel Meriaux
• Original Assignee: Michel Lablache-Combier, Michel Meriaux
• Inventors: MICHEL MERIAUX, MICHEL LABLACHE-COMBIER
• Application Number:
  US04/211,344
• Time in Patent Office: 1,334 Days
• US Class Current: 405/294
• CPC Class Codes: E21D 17/0206 Hydraulically operated extension devices
• CPC Class Codes: E21D 17/08 Cap joints for obtaining a coal-face free of pit-props
• CPC Class Codes: E21D 17/082 of sliding type
• CPC Class Codes: E21D 23/063 Retractable cantilever extensions therefor

Claims

1. IN A MINE ROOF SUPPORTING STRUCTURE, THE COMBINATION COMPRISING A MINE ROOF SUPPORTING MEMBER HAVING A HOLLOW INTERIOR DEFINING A RECESS, AN EXTENSION MEMBER SLIDABLY DISPOSED IN SAID RECESS IN TELESCOPING ARRANGEMENT, SAID EXTENSION MEMBER BEING MOVABLE FROM A RETRACTED POSITION IN THE RECESS TO AN EXTENDED POSITION RELATIVE TO THE RECESS, ONE END OF SAID EXTENSION MEMBER REMAINING WITHIN SAID RECESS, A BEARING MEMBER POSITIONED WITHIN SAID RECESS ADJACENT ONE END OF SAID SUPPORTING MEMBER, SAID BEARING MEMBER ADAPTED TO ENGAGE SAID EXTENSION MEMBER INTERMEDIATE THE ENDS THEREOF TO THEREBY PROVIDE A FULCRUM FOR THE EXTENSION MEMBER WHEN AT THE EXTENDED POSITION, HYDRAULIC CLAMPING MEANS SECURED TO SAID EXTENSION MEMBER IN PROXIMITY TO SAID ONE END THEREOF, SAID HYDRAULIC CLAMPING MEANS BEING CARRIED AS A UNIT BY THE EXTENSION MEMBER AND MOVABLE THEREWITH, SAID HYDRAULIC CLAMPING MEANS INCLUDING A HYDRAULIC JACK HAVING A RAM ELEMENT, SAID RAM ELEMENT BEING MOVABLE INTO ENGAGEMENT WITH THE INTERIOR OF SAID SUPPORTING MEMBER, WHEREBY SAID EXTENSION MEMBER IS PIVOTED ABOUT THE BEARING MEMBER SUCH THAT SAID ONE END OF SAID EXTENSION MEMBER MOVES IN ONE DIRECTION AND THE OPPOSITE END OF SAID EXTENSION MEMBER IS MOVED IN THE OPPOSITE DIRECTION AND FORCED AGAINST A MINE ROOF.