Bolt with an omiron-ring seal and antifriction resinous shim

Claim 1

A FASTENER UNIT OF THE CHARACTER DESCRIBED, ADAPTED TO BE ENGAGED IN A PIECE OF WORK, INCLUDING, AN ELONGATE VERTICALLY DISPOSED SHANK, AN ENLARGED TOOL ENGAGING HEAD ON THE SHANK AT THE UPPER END THEREOF AND HAVING A DOWNWARDLY DISPOSED WORK ENGAGING FACE, AN ANNULAR CHANNEL IN THE HEAD ADJACENT THE SHANK AND OPENING DOWNWARDLY IN THE DIRECTION THAT THE SHANK PROJECTS FROM THE HEAD, THE CHANNEL HAVING INNER AND OUTER SIDE WALLS AND A BOTTOM WALL OPPOSING THE WORK, THE OUTER SIDE WALL BEING SPACED FROM AND INCLINED DOWNWARDLY AND OUTWARDLY RELATIVE TO THE SAID INNER WALL, AN ANNULAR RESILIENT O-RING SEAL ENGAGED IN THE CHANNEL TO OCCUR BETWEEN THE SIDE WALLS AND HAVING A PORTION NORMALLY PROJECTING DOWNWARDLY FROM THE CHANNEL TO ENGAGE AND SEAL WITH THE WORK, AND AN ANNULAR ANTI-FRICTION SHIM ENGAGED IN THE CHANNEL TO OCCUR BETWEEN THE TOP OF THE O-RING AND THE BOTTOM WALL OF THE CHANNEL, THE COEFFICIENT OF FRICTION BEING GREATER BETWEEN THE WORK AND THE O-RING THAN BETWEEN THE SHIM AND THE O-RING WHEREBY THE FASTENER WILL ROTATE RELATIVE TO THE ORING WHEN THE O-RING ENGAGES THE WORK, THE O-RING BEING SMALLER IN CROSS SECTIONAL AREA THAN THE COMBINED CROSS SECTIONAL AREAS OF THE CHANNEL AND SHIM AND ADAPTED TO BE URGED INTO PRESSURE SEALING ENGAGEMENT WITH THE WORK, AND THE SIDE WALLS OF THE CHANNEL WHEN THE WORK ENGAGING FACE OF THE HEAD ENGAGES THE WORK.