Abstract: A buckling pattern steel pipe for being buried in ground in which flexure occurs includes: a steel pipe straight portion; and a buckling pattern portion. The buckling pattern portion is in a shape expressed by a sine wave determined based on: a buckling wavelength which is 2.05 to 4.32 times a compression local buckling half wavelength expressed by 1.72?(r·T); and a crest height expressed by a value 8.00 to 16.25 times a pipe thickness of the steel pipe straight pipe portion, and the buckling pattern portion absorbs bending compression deformation caused by faulting of the ground and axial compression deformation caused by the flexure so as to avoid deformation of the steel pipe straight pipe portion, where r is a pipe thickness center radius of the steel pipe straight pipe portion and T is the pipe thickness of the steel pipe straight pipe portion.

Abstract: A buckling pattern steel pipe for being buried in ground in which flexure occurs includes: a steel pipe straight portion; and a buckling pattern portion. The buckling pattern portion is in a shape expressed by a sine wave determined based on: a buckling wavelength which is 2.05 to 4.32 times a compression local buckling half wavelength expressed by 1.72?(r·T); and a crest height expressed by a value 8.00 to 16.25 times a pipe thickness of the steel pipe straight pipe portion, and the buckling pattern portion absorbs bending compression deformation caused by faulting of the ground and axial compression deformation caused by the flexure so as to avoid deformation of the steel pipe straight pipe portion, where r is a pipe thickness center radius of the steel pipe straight pipe portion and T is the pipe thickness of the steel pipe straight pipe portion.

Abstract: The first case has an outer surface extending portion at which the end edge side of the first case extends toward the second case side at an outer surface side of the main body case, and also has an inner surface extending portion at which the end edge side of the first case extends along an inner surface of the second case, and the outer surface extending portion and the inner surface extending portion of the first case sandwich the step-shaped projection of the second case in a state where the first case and the second case are joined, and upper end edges of the holder side walls support a lower end edge of the inner surface extending portion by contacting.

Abstract: A portable power source apparatus has a closing surface (21) facing an open end of a main case (10) and an exposed surface (22) externally exposed at an opposite end of a cap section (20) from the closing surface; a planar circuit board (38) housed in the cap section with voltage conversion circuitry for converting the voltage of the circular cylindrical batteries CB contained in the main case; and a power supply terminal (50) disposed in the exposed surface of the cap section and capable of outputting power from the circular cylindrical batteries CB contained in the main case. The circuit board is disposed diametrically across a circular cross-section of the cap section, and a pair of ribs (42) is provided approximately perpendicular to the circuit board.

Abstract: The battery charger is capable of charging a battery pack 2. The battery charger is provided with a docking section 1 where the battery pack 2 can be attached for charging, and a charging section 3 with a charging circuit 40 to supply a given amount of charging power to the battery pack 2 attached in the docking section 1. The battery charger is characterized by the docking section 1 and charging section 3 having a detachable structure.

Abstract: A portable power source apparatus has a closing surface 21 facing the open end of the main case 10 and an exposed surface 22 externally exposed at the opposite end of the cap section 20 from the closing surface 21; a planar circuit board 38 housed in the cap section 20 with voltage conversion circuitry mounted to convert the voltage of the circular cylindrical batteries CB contained in the main case 10; and a power supply terminal 50 disposed in the exposed surface 22 of the cap section 20 and capable of outputting power from the circular cylindrical batteries CB contained in the main case 10. The circuit board 38 is disposed diametrically across a circular cross-section of the cap section 20, and a pair of ribs 42 are provided approximately perpendicular to the circuit board 38.

Abstract: An IC socket comprises a socket body (13), a contact pin (14) with a contact portion (17) erected on the socket body (13) such that it is flexible toward the inside of the socket body (13), and a pressing member (15). The contact portion (17) has a contact face made by rounding a rectangular upper portion of the contact pin (14), thus minimizing an area of contact with the terminal (12) of a semiconductor package (11).

Abstract: An IC socket comprises a socket body (13), a contact pin (14) with a contact portion (17) erected on the socket body (13) such that it is flexible toward the inside of the socket body (13), and a pressing member (15). The contact portion (17) has a contact face made by rounding a rectangular upper portion of the contact pin (14), thus minimizing an area of contact with the terminal (12) of a semiconductor package (11).