The invention relates to a method of creasing sheets (12) by using a creasing tool (14, 20, 21) cooperating with a counter element (22, 23), comprising the following steps: a creasing plate blank (24′) is provided with at least one creasing projection (26) by plastically deforming the material of the blank (24′) so as to form a creasing plate (24), the creasing plate (24) is mounted to a creasing tool (14, 20, 21), sheets (12) to be provided with at least one crease are advanced through a gap between the creasing tool (14, 20, 21) and the counter element (22, 23).

A metal bead seal with uniform sealing surface pressure and improved sealability is provided. A sealing bead is integrated with a basal part made of metal, and includes a curved part that is curved in a plan view and that includes a maximum bead width part having a maximum bead width w.sub.1, a straight part that is straight in a plan view and continuous from the curved part, the straight part including a minimum bead width part having a minimum bead width, a gradually varying bead width part that is positioned between the maximum bead width part and the minimum bead width part, the gradually varying bead width part having its bead width continuously varied from the maximum bead width to the minimum bead width.

A telescopic suspension fork leg (1, 43) is provided, with an inner tube (2) and an outer tube (3) and a damping device (7) and a spring device (5), which is arranged inside a first chamber (5) formed in the inner tube (2) or outer tube (3) and is supported with respect to a second chamber (6) formed by the damping device (7), and the telescopic suspension fork leg (1, 43) is designed to receive a damping fluid, the damping device (7) comprising a piston (9) supported on a piston rod (8) and having an upper and a lower piston surface (10); 11) and the piston (9) is displaceable within a damping tube (13) arranged substantially concentrically to the inner tube (2) and the damping tube (13) is surrounded by an annular chamber (14) arranged substantially concentrically to the damping tube (13) and a gap space (15) is formed between the inner tube (2) and the outer tube (3) and a sliding bush (28) radially surrounding the inner tube (2) is provided and the telescopic suspension fork leg (1, 43) has a sealing device (24) radially surrounding the inner tube (2), which sealing device (24) has at least one sealing means (25) supported on an outer circumferential surface (27) of the inner tube (2), and a receiving chamber (37) for receiving damping fluid is provided between the sealing device (24) and the slide bush (28), wherein the telescopic suspension fork leg (1, 43) has at least one fluid passage (38) between the receiving chamber (37) and a receiving space (39) provided on the telescopic suspension fork leg.

There is a need to suppress falling or rising of an end of a press-formed product and twisting of the press-formed product due to springback to suppress a shape defect of the press-formed product due to the springback and, in designing a shape of a press-formed product produced by press-forming a sheet material, a curvature radius (R1) of a concave curved portion and a curvature radius (R2) of a convex curved portion of a concave and convex curved shape of an additional shape arranged on the press-formed product where the concave curved portion and the convex curved portion are continuous are set to be the same.

The present invention relates to a tubular element for a gas pressure container of an airbag system of a motor vehicle, wherein the tubular element (10) has at least one first length section (100, 101) and at least one recess (11) extending in the circumferential direction, characterized in that the tubular element (10) has at least one second length section (102), formed by the recess (11) extending over at least a part of the circumference of the tubular element (10), that the second length section (102) lies between two first length sections (100, 101), that in at least one first length section (100, 101) the outer radius (A1) of the tubular element (10) is greater than the smallest outer radius (A2) of the at least one second length section (102), that the tubular element (10) has a tensile strength of >920 MPa, that the wall thickness (W2) of the tubular element (10) in the at least one second length section (102) is thicker than or equal to the wall thickness (W1) in at least one first length section (100, 101) of the tubular element (10), that the degree of reduction of the outer radius (A2) in the recess (11) lies in the range of 5 to 35% relative to the outer radius (A1) of at least one first length section (100, 101), and that the tubular element (10) consists of a material which, in addition to iron and impurities due to melting, comprises the following alloying elements in the ranges indicated in percent by weight: C 0.05-0.2% Si0.9% Mn 0.2-2.0% Cr 0.05-2% Mo<0.5% Ni<1.0% Nb 0.005-0.10% Al<0.07% Ti<0.035% and B<0.004%.

A shock absorber includes a pressure tube, a rod, a rod guide, a first piston, a second piston, and a cup. The pressure tube has an inner surface that defines a fluid chamber. The rod extends into the pressure tube. The rod guide locates the rod relative to the pressure tube. The first piston is coupled to the rod and divides the fluid chamber into an upper working chamber and a lower working chamber. The second piston is coupled to the rod and disposed within the lower working chamber. The cup has an open end configured to receive the second piston and a closed end opposite of the open end. The cup includes a sidewall and a bottom wall. The sidewall includes a cylindrical section and a flared section. The bottom wall forms the closed end of the cup, extends radially outward of the sidewall, and supports the pressure tube.

A frame for steel furniture and a frame assembly, wherein the frame has a simple structure due to having a press groove and a bent bar formed in a hollow bar, is easily assembled through a connecting part or the like, thus greatly reducing manufacturing, installation, and maintenance costs, and can be expanded as in various embodiments. The frame, which is for steel furniture and formed by a hollow rectangular bar, is characterized in that: the corner of the rectangular bar is press-processed by a jig having a predetermined thickness, thereby forming the press groove in two surfaces contacting the corner; the bent bar having an L-shape forms inside the hollow rectangular bar while the press groove is being formed; and threads for fastening a fastening screw are formed on one surface of the bent bar, wherein the one surface faces the press groove.

An object of the present invention is to extend a retention time of clutch oil and enable to efficiently cool clutch plates. A clutch hub (42) which is engaged with the clutch plates in an outer circumference is a press-molding article made from one steel sheet. In its inner circumferential surface, plural oil grooves (74-4) for cooling the clutch plates, which are extended to a shat direction and have a space in a circumferential direction. Each of dams (76) as a press-molding portion extending to radial inward is formed at an end portion of each of the oil groove (74-4). The press-molding of the dams (76) is performed by pressing a front surface side of the clutch hub (42) by punches (82) and disposing inner pressing tools (84) at a back surface side. The dams (76) comprise an upright front surface (76-1) and a back surface (76-2), which are a molding surface molded by using the molding tools. The back surface (76-2) has a steep shape as long as attaching and detaching inner pressing tools (84) is not prevented. Thereby, the retention time of the clutch oil in the oil grooves (74-4) can be extended and cooling efficiency of the clutch plates can be enhanced.

An object of the present invention is to extend a retention time of clutch oil and enable to efficiently cool clutch plates. A clutch hub (42) which is engaged with the clutch plates in an outer circumference is a press-molding article made from one steel sheet. In its inner circumferential surface, plural oil grooves (74-4) for cooling the clutch plates, which are extended to a shat direction and have a space in a circumferential direction. Each of dams (76) as a press-molding portion extending to radial inward is formed at an end portion of each of the oil groove (74-4). The press-molding of the dams (76) is performed by pressing a front surface side of the clutch hub (42) by punches (82) and disposing inner pressing tools (84) at a back surface side. The dams (76) comprise an upright front surface (76-1) and a back surface (76-2), which are a molding surface molded by using the molding tools. The back surface (76-2) has a steep shape as long as attaching and detaching inner pressing tools (84) is not prevented. Thereby, the retention time of the clutch oil in the oil grooves (74-4) can be extended and cooling efficiency of the clutch plates can be enhanced.

This torsion beam manufacturing method is for manufacturing a torsion beam including a central portion of which a cross-section orthogonal to a longitudinal direction is a closed cross-section having a substantial V-shape or a substantial U-shape at any position in the longitudinal direction, and a shape changing portion which has a connection region leading to the central portion and including a closed cross-section having a shape different from the shape of the closed cross-section of the central portion.

This torsion beam manufacturing method has a compression step of thickening at least the connection region through application of a compression force in the longitudinal direction to at least the connection region of a torsion beam material to obtain the torsion beam, the torsion beam material being formed with the central portion and the shape changing portion.