초록 ▼

A sealing system is provided for a prefabricated pit for servicing an aircraft that is formed with an open bottom and an inner cylindrical wall for surrounding a riser pipe therewithin. An annular rubber boot having annular inner and outer marginal edges is located at the bottom of the pit. The inne

A sealing system is provided for a prefabricated pit for servicing an aircraft that is formed with an open bottom and an inner cylindrical wall for surrounding a riser pipe therewithin. An annular rubber boot having annular inner and outer marginal edges is located at the bottom of the pit. The inner peripheral margin of the boot is secured to the riser pipe by a conventional metal band clamp to establish a liquid tight seal therewith, and the outer peripheral margin of the boot is compressed radially outwardly against the cylindrical wall surface by means of an outer clamp. The outer clamp is comprised of a length of metal stock formed into a loop having opposite ends, loop extension means attached to one of the opposite ends to receive the other end therewithin in overlapping fashion, and an expansion system attached to the ends of the loop for selectively and adjustably spreading the loop radially outwardly to thereby clamp the peripheral margin of the boot in a liquid tight seal against the cylindrical wall of the pit.

대표청구항 ▼

A sealing device for a subsurface chamber having a wall defining an inner cylindrical surface and an open bottom comprising: an expanse of flexible, liquid impervious material disposed across said open bottom and defining an outer annular peripheral margin which establishes a continuous, unbroken an

A sealing device for a subsurface chamber having a wall defining an inner cylindrical surface and an open bottom comprising: an expanse of flexible, liquid impervious material disposed across said open bottom and defining an outer annular peripheral margin which establishes a continuous, unbroken annular band of contact with said inner cylindrical wall surface, and clamping means including an expandable hoop comprised of an elongated length of metal wire having opposite ends juxtaposed in proximity to each other and formed into a loop having an opening between said opposite ends, a pair of bearing lugs each of which is secured to a different one of said opposite ends of said elongated length of wire and each of which includes longitudinal openings in coaxial alignment with each other, interiorally threaded engagement means located at each of said longitudinal openings, a pair of metal wire segments each of which is secured to one and no more than one of said lugs wherein said wire segments reside in contact with said unbroken annular band on opposite sides of said opposite ends of said elongated length of wire and in longitudinally overlapping fashion therewith to thereby span said opening between said opposite ends to form a completely enclosed hoop, and an externally threaded stud having ends which project into said longitudinal openings in said bearing lugs and wherein said externally threaded stud is threadably engaged in both of said interiorally threaded engagement means at said longitudinal openings such that relative rotation between said externally threaded stud and said interiorally threaded engagement means in one direction presses said lugs apart to expand said hoop and relative rotation between said externally threaded stud and said interiorally threaded engagement means in an opposite direction allows said hoop to contract.