Back to results
US 6,467,812 B1Granted
Pipe having replaceable wear resistant lined coupler
AssigneeConstruction Forms, Inc.
InventorsRobert E. Klemm, Gary D. Lehnhardt
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeConstruction Forms, Inc.
InventorsRobert E. Klemm, Gary D. Lehnhardt
Estimating the term…
A pipe section for concrete includes an end coupler interconnecting to another pipe section in a flow line. The coupler has an outer clamp secured extended from the pipe end with a coupling groove. An encircling clamp has sides located in the grooves of adjacent pipe sections to lock the pipe section together. The body and pipe end form an inner recess extending from the pipe end. An insert liner has a tubular portion matching the recess, with the outer surface of the tubular portion tapered to form a gap within the recess. The insert liner has an outer flange matching the outer diameter of the body and abuts the body. The inner wall of the liner has a central transition point from which the wall tapers inwardly in opposite directions to the outer end. The body member is formed of a high strength ductile steel. The insert liner is formed of a wear resistant material having a Rockwell hardness of 80 to 90. A carbide alloy consisting essentially of carbides, martensite, bainite and austenite, and 12-15% chromium, 2-3% carbon and traces nickel, molybdenum and austenite. A toughened ceramic is disclosed. The liner is adhesively bonded to the body using an epoxy adhesive which is responsive to heat for release of the liner. The liner is inserted by applying adhesive on the tubular portion and then pushing the liner into the recess.
A pipe unit for releasable connection of one pipe member to a second pipe member in a concrete pumping line for carrying concrete, comprising:
A coupler connected to a first steel pipe section having a hardened inner wall and a coupling end for interconnecting the first pipe section to a second pipe section for carrying of an abrasive concrete material, each said pipe sections having at least one coupling end, said coupler comprising:
A coupler for connecting a first steel pipe having a hardened inner wall to a second pipe for transport of a highly abrasive material, comprising a coupling member having an outer clamping projection and for securement to the first steel pipe end with said clamping projection axially spaced from the steel pipe and having an inner tubular recess of a diameter greater than the inner diameter of said steel pipe, and a wear resistant liner secured within said recess with a continuous interface between said liner and said coupling member and a flange abutting the end of the coupling member and forming an abrasive resistant end face, and a heat responsive adhesive interposed within said continuous interface between said coupling member and said liner, said liner including said flange formed of an abrasive resistant material.
A removable flanged insert liner for adhesive bonding within a steel pipe having a hardened inner wall and having an inner recessed end with an inner recessed diameter, comprising a tubular body having an end flange extending substantially radially outwardly of said tubular body, said tubular body having an outer surface having a first portion corresponding to said recess diameter and a second portion adjacent said first portion with a lesser diameter than said recessed diameter to form an adhesive receiving gap between said recessed end and said second portion of said tubular body for receiving an adhesive and thereby securing said liner in said recessed end, said adhesive and said liner being removable from said steel pipe for replacement of said liner and said adhesive.
A liner unit to be secured within an end body member secured to the end of a pipe for carrying an abrasive fluid material comprising a cast member of a wear resistant iron alloy having a microstructure consisting essentially of carbides, martensite, bainite and austenite.
Dependencies are inferred from the claim text.