Daido Kogyo Co., Ltd.

Daigo Masumoto

Yoshihaya Imamura

Junichi Sato

Katsuhiro Motode

Yoshiaki Sawade

Tadashi Sekido

Sora Demura

Naoto Himiyama

A chain measurement device is for measuring a slack amount of a chain wound around sprockets. The chain measurement device includes a main body portion including an acceleration sensor, and an attachment portion configured to attach the main body portion to the chain. The acceleration sensor is configured to detect acceleration in a gravitational direction in a case where the main body portion attached to the chain is lifted upward within a range of the slack amount of the chain and then dropped.

Chain measurement device, chain measurement system, and method for calculating slack amount of chain

Drive chain measuring tool

A method prevents a cylindrical body from buckling in externally curling edges of both side portions by pressing curling dies in an axial direction after molding the cylindrical body having a drop portion whose outer diameter is small and two side portions whose outer diameter is large by enlarging a cylindrical material made of aluminum alloy by electromagnetic molding. In curling the edges of the side portions, a buckling preventing die restrains an outer periphery of the drop portion of the cylindrical body. Because the buckling preventing die receives the axial compression force of the curling dies, it can prevent the cylindrical body from buckling and deforming. The buckling preventing die is what a split die disposed on the side of an outer periphery of the cylindrical material in the electromagnetic molding is used as.

Method for molding vehicular wheel rim

Growing community of inventors

Kaga, Japan

Daigo Masumoto