| 摘要 |
A fixed chain guide for absorbing vibrations during running of a chain is composed of a shoe in sliding contact with the chain and a plate base supporting the shoe. The plate base is secured to a mounting surface by two mounting seats integral with the base plate. The mounting seats are formed by bending them in opposite directions along bend lines, to have the seats in an essentially common plane but extending in opposite directions from the bottom edge of the base plate. The base plate is punched out of sheet stock in such a way that failure will not occur at the respective bend lines of the mounting seat by forming the ends of the bend lines so that there is a shear surface on the outside of the bend and a rupture surface on the inside of the bend. Punching the stock originally produces a shear surface adjacent one surface of the stock at the ends of one of the bend lines and a rupture surface adjacent the other side of the stock. The other of the bend lines is punched out at the ends by counterpunching from the opposite side of the plate base from the original punching to reverse the shear and rupture surfaces.
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