| 摘要 |
A connection for securing one end of a helically convoluted suction hose to a hose fitting such as is used to effect rapid engagement of the hose with or disengagement thereof from the suction inlet of a vacuum cleaner. The fitting includes a tubular portion having external threads of the same pitch as the unstressed convolutions of the hose so that the tubular portion can be threaded into the end of the hose. The cross sectional configuration of the threads is such as to resist relative rotation between the fitting and the end of the hose when the threads are engaged with the hose convolutions. Additional resistance to relative rotation between the fitting and end of the hose is provided by a collar at the inner end of the tubular portion, the collar serving as an abutment to cause compression and a reduction in the pitch of the convolutions of the hose between the threads and collar with continued threading of the fitting into the end of the hose after the end edge of the hose has engaged the collar. Barbs on the threads substantially increase the resistance to rotation of the fitting relative to the end of the hose in a direction to effect unthreading of these parts, the barbs being provided by sharp transverse edges and corners on the threads. Removal of the remnant of the hose remaining on the tubular portion after the hose has been severed adjacent to the end of the tubular portion in order to replace or repair the hose is facilitated by interrupted portions of the threads, such interrupted portions permitting axial slitting of the hose remnant and removal thereof from the tubular portion. |
