| 摘要 |
A pneumatically operated device for protecting external threads on a pipe comprises a cylindrical inner sleeve including a cylindrical rigid member 6 enclosed on one end by an overlapping end wall 7 and open at the other end thereof, and a cylindrical expansible member 8 in intimate contact with the exterior cylindrical surface 35 of the rigid member. A resilient cylindrical thread shield member 20 is disposed concentrically around and outwardly spaced from the inner sleeve such that an annulus 36 is formed to receive the threaded end 40 of the pipe 56. Valve means 26 and 52 for inflating and deflating the expansible member 8 are provided. The upper and lower lips 64, 38 of the expansible member 8 may be secured to the rigid member 6, and may be vulcanised. <IMAGE>
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