A fin-assembled tube includes a helical fin arranged in an interior of a tube, wherein the tube has: a straight tube portion the center line of which extends in a substantially straight line; and a bent portion the center line of which is curved, and the helical fin is formed such that a helical pitch in an axial direction is longer in a portion positioned in the bent portion relative to the helical pitch in a portion positioned in the straight tube portion, the helical pitch being a pitch of a plate-shaped fin material twisted by a certain angle about the center line.

A method of operating a motor-actuated handheld pressing unit includes actuating a switch to initiate a pressing operation whereby one or more pressing jaws are moved from a starting position to a closed pressing position; automatically releasing the one or more pressing jaws by using a pressing piston when a prescribed pressing force has been reached, the pressing piston being actuated hydraulically by a hydraulic medium; and checking the reaching of the prescribed pressing force by using a pressure sensor to detect the pressure of the hydraulic medium. In an embodiment, the release of the pressing jaws may be interrupted. In an embodiment, a motor moves the jaws from the starting position to the closed pressing position. In an embodiment, the pressing force is continuously measured on intervals of less than one second.

A radial press has a plurality of press bodies arranged around a press axis which can be moved radially in relation to the press axis, and a drive unit for shifting the press bodies in the direction of or away from the press axis. The press bodies each have a main jaw and a pressing jaw, which is fixed interchangeably on the main jaw. The main jaws each comprise a radially inwardly arranged pressing-jaw-supporting surface and, adjacent to the latter in the circumferential direction, two side surfaces. The pressing jaws butt against the pressing-jaw-supporting surface of the associated main jaw and have a fixing protrusion, which projects from the abutment surface, enters into a mount provided on the main jaw and interacts with a locking device. Each main jaw has a recess on its supporting surface which extends from the mount and opens out on one of the side surfaces.

A heat exchanger having at least one inner conduit comprising of a second tubular member coaxially disposed within a first tubular member, wherein the second tubular member outer surface is in contact with the first tubular member inner surface. Each of the first and second tubular members is composed of a material with an approximately 0.015 inch maximum wall thickness.

A heat exchanger having at least one inner conduit comprising of a second tubular member coaxially disposed within a first tubular member, wherein the second tubular member outer surface is in contact with the first tubular member inner surface. Each of the first and second tubular members is composed of a material with an approximately 0.015 inch maximum wall thickness.

A strut and method for assembling a strut. The strut comprises two strut members attachable by a threading mechanism or the like. A first strut member is screwed into the second strut member. A pin hole is formed at the seam between the strut members and a pin is inserted into the pin hole. A locking ring is formed around the pin hole that includes an angular lip adjacent to the hole. The locking of the pin is accomplished, by swaging the angular lip into the hole and over the pin to lock the pin in the pin hole. The purpose of the pin is to ensure the joint does not untwist during operation.

A strut and method for assembling a strut. The strut comprises two strut members attachable by a threading mechanism or the like. A first strut member is screwed into the second strut member. A pin hole is formed at the seam between the strut members and a pin is inserted into the pin hole. A locking ring is formed around the pin hole that includes an angular lip adjacent to the hole. The locking of the pin is accomplished, by swaging the angular lip into the hole and over the pin to lock the pin in the pin hole. The purpose of the pin is to ensure the joint does not untwist during operation.

Provided are: a joining structure capable of suitably obtaining joining strength between components which compose the joining structure; and a joining method thereof. For this purpose, a joining structure (1) includes: a shaft member (10); and a thin-walled cylindrical member (20) that fits an inner circumferential surface thereof to an outer circumferential surface of the shaft member (10). The thin-walled cylindrical member (20) has: a first crimped portion (21), in which an axially intermediate portion is reduced in diameter in a radial direction, and is crimped to the shaft member (10); and a second crimped portion (22), in which an end surface (20a) is folded radially inward, and is crimped to the shaft member (10).

A connector assembly has a pipe, a sealing element, and a plug connector which includes a connector body. The connector body has an annular chamber which is located between a first exterior section and a second exterior section of the plug connector. A connecting section of the pipe is inserted into the annular chamber of the connector body from the pipe receiving side and is connected thereto. The connecting section of the pipe includes a fastening recess and a seal receptacle which are incorporated in a circumferential surface of the pipe, the seal receptacle being structurally separated from the fastening recess. The first or the second exterior section is deformed in the region of the seal receptacle in such a way that the sealing element is pressed between the first or second exterior section and the seal receptacle.

A hammer for installing a gasket into a joint between two pipes, the hammer comprising two opposed substantially rectangular, non-square strike surfaces which are rotationally offset from one another by 90 degrees such that an appropriate substantially rectangular, non-square strike surface may be selected by the user and applied to a gasket by simply rotating the hammer in the user's hands without requiring the user to relocate around the gasket.