Adapter with thread protector

Claim 1

A coupling device for connecting the internally threaded end of a nozzel to a hose, comprising a tubular body connectable at one end to the hose and having a smooth cylindrical bore with a diameter about equal to the hose bore diameter extending substantially the full length of the body, said body having external threads at the other end for connection to said nozzel, a sleeve mounted on said body for limited relative axial movement between a first position with one end thereof radially spaced from and fully covering said external threads and a second position fully exposing said threads, said body having first and second axially adjacent external cylindrical portions extending from said external threads for substantially the remainder of the length of the body, said first portion having a diameter approximately the same as the inside diameter of said sleeve and greater than the diameter of said second portion, said first and second portions being joined by radial shoulder means, said sleeve having a radially inwardly projecting ridge defined by axially spaced shoulders and having cylindrical inner surfaces with the same diameter extending from opposite ends of the sleeve to opposite sides of said ridge, said body having an annular groove adjacent to the inner end of said external threads, a snap ring mounted in said groove and projecting radially outwardly therefrom for engagement with one of said shoulders when said sleeve is in said first position, and a helical compression spring coaxially disposed about said second body portion within said sleeve and having opposite ends abutting the other of said sleeve shoulders and said shoulder means, respectively.