Abstract: A coupling head and connecting tube assembly structure comprises a coupling head having an external-threaded section to fit to a connecting tube wherein the coupling head has a hollow bore extending through the interior to which the connecting tube is joined therewith. Furthermore, the connecting tube has the internal surface synchronically pressed by multiple dotted-punching forces so that the internal surfaces of both connecting tube and coupling head synchronically depressed by the dotted-punching forces exerting thereon can form multiple positioning points that are reciprocally bound to each other so as to combine the coupling head and connecting tube into one unit, facilitating easy and speedy assembly thereby.

Abstract: A telescopic tube with water supply is equipped with a minor tube, a major tube that are connected to each other by a tubular coupling device which has a registration end and a connecting section, the former is engaged with one end of the minor tube and the latter is engaged with the top end of the major tube. A guard cap is secured to the top end of the major tube which serves to prevent the minor tube from easy disengagement from the major tube in case of excessive extension adjustment. The connecting section of the tubular coupling device has a cone shaped configuration with a spiral thread track defined thereon and terminates in a stop board.

Abstract: A long-handled spray gun with a rotary head has a connector head, a rotary member, a fixed member, a connection, part, a long tubular rod, a block, a fixing bolt, a large and a small ring washers and a flexible locating member wherein the rotary member screw joined to the connector head at one side is pivotally engaged with the fixed member with the large and small ring washers adapted therein and the flexible locating member inserted into one of locating slots of the rotary member for proper location thereof, and the connection part is coupled with the fixed member and the long tubular rod at both ends respectively. The fixing bolt is adapted to pivotally engage the rotary member with the fixed member thereof and the block having a serrated polygonal flange disposed thereon is matched to a serrated polygonal fixing head of the fixed member, preventing the fixing bolt from coming off when the rotary member thereof are pivotally rotated.