U-shaped tube engagement structure and method of forming the same

A U-shaped tube engagement structure comprising:

• a fixing sheet, an abutting sheet and a locking bolt;
• the fixing sheet includes a top edge, a first segment, and a second segment, wherein the first segment has a through orifice defined in a center thereof and configured to accommodate the locking bolt after stamping, the first segment is located on an end of the fixing sheet away from the top edge, and the first segment has a first hooking portion extending leftward on a free end of the first segment;
• wherein the second segment is located on the other end of the fixing sheet away from the first segment, and the second segment has a second hooking portion extending on a free end of the second segment and opposite to the first hooking portion;
• wherein a side of the second segment adjacent to the second hooking portion is the abutting sheet one-piece parallelly extending, the abutting sheet includes a force portion and a connection portion, wherein the connection portion is one-piece connected with the second segment to the force portion proximate to the second hooking portion;
• wherein the locking bolt includes a defining portion, a retaining portion, and an internal threaded section passes through the defining portion and the retaining portion, wherein a diameter of the defining portion is greater than a diameter of the retaining portion;
• wherein features of the tube engagement structure comprises after machining the abutting sheet, the abutting sheet is parallelly stacked below the fixing sheet, and a center of the force portion corresponds to the internal threaded section below the defining portion of the locking bolt, wherein the fixing sheet and the abutting sheet are machined so that the first segment and the second segment of the fixing sheet are accurately bent and are perpendicular to the top edge and form an arcuate receiving space with the force portion of the abutting sheet.