Sluice gate with inflatable rubber seal

Claim 1

A SLUICE GATE STRUCTURE FOR ATTACHMENT TO AN EXPOSED FACE OF A THIMBLE MOUNTED IN A WALL, COMPRISING: A GUIDE AND CLOSURE UNIT HAVING A PAIR OF SPACED UPRIGHT GUIDE RAILS AND A CLOSURE LOOSELY MOUNTED FOR MOVEMENT TRANSVERSELY OF THE FACES OF SAID CLOSURE AND FOR LINEAR MOVEMENT BETWEEN AND ALONG THE GUIDE RAILS, ONE FACE OF SAID CLOSURE HAVING A FLAT FACE IMMEDIATELY INSIDE THE GUIDE RAILS AND SURROUNDING THE CENTRAL PORTION OF THE CLOSURE, SAID GUIDE RAILS HAVING STOP MEANS ENGAGEABLE WITH THE FACE OF SAID CLOSURE OPPOSITE SAID ONE FACE TO LIMIT THE MOVEMENT TRANSVERSELY OF SAID FLAT FACE WHEN THE CLOSURE IS POSTIONED TO SEAL AGAINST FLUID FLOW; A TUBULAR BASE STRUCTURE HAVING AN INTERNAL FLOW PASSAGE FOR FLUID AND OUTWARDLY EXTENDING STRUCTURAL PARTS FOR RECEIVING SAID GUIDE AND CLOSURE UNIT, SAID GUIDE RAILS BEING REMOVABLY ATTACHABLE TO THE BASE STRUCTURE WITH EXTERNALLY OPERABLE ATTACHMENT MEANS, SAID BASE STRUCTURE HAVING A FLANGE WITH AN ABUTMENT FACE SURROUNDING SAID PASSAGE AND DIRECTLY FACING SAID FLAT FACE WHEN THE CLOSURE IS POSITIONED TO SEAL THE FLUID FLOW; AN INFLATABLE SEAL MEMBER CARRIED ON AT LEAST ONE OF THE CLOSURE FLAT FACE AND THE FLAANGE ABUTMENT FACE AND EXTENDING PERIPHERALLY OF THE FLOW PASSAGE INSIDE SAID RAILS, SAID SEAL BEING INFLATABLE WHEN THE CLOSURE IS POSITIONED OVER THE PASSAGE TO SEAL THE PERIPHERY OF THE PASSAGE BETWEEN THE CLOSURE AND BASE STRUCTURE; AND EXTERNALLY OPERABLE ATTACHMENT MEANS FOR SECURING SAID BASE STRUCTURE TO SAID THIMBLE TO ALIGN SAID FLUID PASSAGE WITH THE THIMBLE AND PORTION SAID GUIDE AND CLOSURE UNIT IN POSITION TO OPEN AND CLOSE SAID PASSAGE.