A first annular groove is filled with a material of a solenoid case and a first joined portion is formed after a second annular groove is filled with the material of the solenoid case and a second joined portion is formed. This allows a load applied to a piston rod when the material of the solenoid case flows into the first annular groove to be partially received by the second joined portion, thereby contributing to reducing a reaction force received by the piston rod and thus preventing the deformation of an upper-end portion of the piston rod due to the reaction force received by the piston rod.

The present invention relates to a method for interference-joining concentric cylinders, where the smaller cylinder (102) does not fit into the larger cylinder (101), involving the use of auxiliary cylinders inside an assembly chamber (301), such that the interference is momentarily eliminated by means of isostatic pressure, and one cylinder is fitted into the other, yielding an interference-joined thicker cylinder. The pressure is released, and it is removed from the assembly chamber (301) finally leaving only the two interference-joined cylinders. It is possible to assemble 3 or 10 and more cylinders in the same way, assembling a thick cylinder, pre-compressed on the inside and pre-stressed on the outside. Several interference-joined cylinders exert the same stress when the cylinder withstands the maximum pressure, such that it withstands a greater pressure than a single cylinder with the same total wall thickness, which always reduces the stress from a maximum at the inside of the wall to a lower percentage at the outer edge.

The present invention relates to a method for interference-joining concentric cylinders, where the smaller cylinder (102) does not fit into the larger cylinder (101), involving the use of auxiliary cylinders inside an assembly chamber (301), such that the interference is momentarily eliminated by means of isostatic pressure, and one cylinder is fitted into the other, yielding an interference-joined thicker cylinder. The pressure is released, and it is removed from the assembly chamber (301) finally leaving only the two interference-joined cylinders. It is possible to assemble 3 or 10 and more cylinders in the same way, assembling a thick cylinder, pre-compressed on the inside and pre-stressed on the outside. Several interference-joined cylinders exert the same stress when the cylinder withstands the maximum pressure, such that it withstands a greater pressure than a single cylinder with the same total wall thickness, which always reduces the stress from a maximum at the inside of the wall to a lower percentage at the outer edge.

A method for joining composite rods with tubular shape without expensive, machined connectors and without compromising the structural integrity of the composite rod includes internal and external collars applied to the ends of the composite rod and deformed via unidirectional compressive load applied by a clamp in the radial direction of the composite rod cross-section. The resulting plastic deformation of the metal collars and composite rod interlock those components to support both compressive and tensile loads. The deformed metal collars are easily joinable to other components via off-the-shelf hardware.

The pressing tool includes two pressing jaws which are movable towards one another from an open position into a closed position for pressing, said pressing jaws including a connecting element for connection to respective receiving elements of the pressing ring, so that the press ring is movable from an open position into a closed position by the movement of the pressing jaws for pressing the press fitting. The minimum spacing of the connecting elements in the open position is greater than the maximum spacing of the receiving elements of the press ring in the open position, and the minimum spacing of the connecting elements in the closed position corresponds to a minimum spacing of the receiving elements of the press ring in the closed position. Furthermore, the minimum spacing of the connecting elements in the open position is smaller than the maximum spacing of the receiving elements of a second press ring in the open position, so that connection to the second press ring is prevented.

Embodiments of the invention provide a die retainer for use in a tool. The die retainer can include a ram head, a release button, and a die pin. The ram head includes a die cavity and a pair of lateral sides on opposing sides of the die cavity. The release button can extend through a release button hole formed in the ram head hand include opposing ends that extend past each of the corresponding pair of lateral sides. The die pin extends through a die pin cavity that intersects the release button hole. The die release button can be actuatable from either of the opposing ends to retract the die pin from the die cavity.

A bead forming method includes the steps of preparing a bumper stay having a partition wall that partitions an internal space and extends in a longitudinal direction, an elastic body that can be inserted into the bumper stay, and a pusher that presses the elastic body; inserting the elastic body into the bumper stay and arranging the elastic body in the bumper stay so as not to come into contact with the partition wall; and forming a buckling bead by compressing the elastic body in the longitudinal direction of the bumper stay by the pusher to expand the elastic body outward in a radial direction without coming into contact with the partition wall, thereby bulging a part of an outer wall of the bumper stay outward in the radial direction without deforming the partition wall.

[SUMMARY]

The present invention is capable of manufacturing an integrated tee type pipe by forming a molding pipe part, with pulling a periphery of a molding hole and protruding it to the outward direction through a pressing device and a molding device, while forming a molding hole of a predetermined shape on an upper side of a straight pipe; and manufacturing a tee type pipe that ensures robustness, productivity, and workability, accordingly.

The invention relates to a crimp coupling including a crimping ferrule for connecting a hose to a fitting. The fitting comprises an outwardly projecting stop collar and a groove which extends circumferentially around the fitting at a constant axial distance to the stop collar. The crimping ferrule, which can be slid onto the fitting, comprises a flange, a tapering hinge section, and a cylindrical section. A distance between the stop collar and the groove of the fitting is dimensioned such that the flange, when abutting the stop collar, has a lower edge facing away from the stop collar above the groove. Due to a diameter reduction of the cylindrical section and a tapering hinge section, during crimping, the flange is pivoted such that the lower edge of the flange is turned into the groove by the pivotal movement of the flange.

The invention relates to a crimp coupling including a crimping ferrule for connecting a hose to a fitting. The fitting comprises an outwardly projecting stop collar and a groove which extends circumferentially around the fitting at a constant axial distance to the stop collar. The crimping ferrule, which can be slid onto the fitting, comprises a flange, a tapering hinge section, and a cylindrical section. A distance between the stop collar and the groove of the fitting is dimensioned such that the flange, when abutting the stop collar, has a lower edge facing away from the stop collar above the groove. Due to a diameter reduction of the cylindrical section and a tapering hinge section, during crimping, the flange is pivoted such that the lower edge of the flange is turned into the groove by the pivotal movement of the flange.