Patent ID: 7980601
Filing Date: 2011-07-19
Classification: F16L,Y10S,Y10T

Abstract:
1. A coupler for a corrugated pipe, comprising: a coupling base having an external thread on an outer surface thereof, the coupling base including a through hole having a diameter less than a diameter of a peak portion of a corrugated pipe, a compression hole having a diameter greater than the diameter of the peak portion of the corrugated pipe, and an insert hole having a diameter greater than the diameter of the compression hole, wherein the through hole, the compression hole and the insert hole are continuously formed through the coupling base; a guide member inserted into the insert hole of the coupling base, with an inclined portion on one end of the guide member; a compression ring having an opening at a predetermined position such that the compression ring is elastically expanded or contracted in diameter, the compression ring fitted into the insert hole of the coupling base; a force-fitting member fitted into the insert hole of the coupling base, the force-fitting member having on one end thereof a pressing portion having an outer diameter corresponding to the diameter of the compression hole; a sleeve inserted into the insert hole of the coupling base and including a protruding part extending outwards from a stop portion formed opposite the insert hole, with a passing hole formed through the sleeve, the passing hole having a diameter corresponding to the diameter of the peak portion of the corrugated pipe; and a cap nut having: a threaded hole engaging with the external thread of the coupling base; and a coupling hole fitted over the protruding part of the sleeve.