Patent ID: 7896398
Filing Date: 2011-03-01
Classification: B25G

Abstract:
1. A pipe handle, comprising: a first pipe formed of a metal pipe material, comprising: a second pipe engaging with the first pipe, the second pipe formed by diametrically expanding a metal pipe material that is the same as the metal pipe material of the first pipe, the second pipe comprising: an engaging member located inside the male coupling of the second pipe, said engaging member comprising a U-shaped member consisting of two legs, each of which extend parallel to a longitudinal axis of the second pipe and adjacent to an internal surface of the second pipe, wherein each of said legs are connected at an end to the other leg by a transverse connecting member that is substantially perpendicular to said two legs, said engaging member also including an engaging projection configured to project through said first and second engaging holes to extend beyond an outer surface of said female coupling when said first and second pipe are connected, said engagement projection having a flat top surface, the top of which slope surface declines toward a distal end of the male coupling, the outer surface of the male coupling is a tapered outer surface whose outside diameter gradually decreases from a boundary between the main body of the second pipe and the male coupling to a distal end of the male coupling, and an angle foamed between the tapered outer surface of the male coupling and the outer surface of the main body is equal to or less than 0°50′, the inner surface of the female coupling is a tapered inner surface whose inside diameter gradually increases from a boundary between the intermediate part and the female coupling to a distal end of the female coupling, and an angle formed between the tapered inner surface of the female coupling and the inner surface of the main body of the first pipe is equal to or less than 0°50′, and the intermediate part has a tapered inner surface whose inside diameter gradually increases from a boundary between the main body of the first pipe and the intermediate part to the boundary between the intermediate part and the female coupling, and an angle formed between the tapered inner surface of the intermediate part and the inner surface of the main body is larger than the angle formed between the inner surface of the female coupling and the inner surface of the main body, and wherein a length of the female coupling from the boundary between the intermediate part and the female coupling to the distal end of the female coupling is larger than a length of the male coupling from the boundary between the main body and the male coupling to the distal end of the male coupling, the length of the male coupling is larger than twice of the outside diameter of the main body of the first pipe or the outside diameter of the main body of the second pipe, the outside diameter of the main body of the first pipe is larger than an outside diameter of the distal end of the male coupling, and the outside diameter of the distal end of the male coupling is larger than an inside diameter of the main body of the first pipe.