| 摘要 |
An odometer which includes a hollow drum having a tubular arm extending normal to one side thereof; a contact-supporting plate having a hollow shaft projecting normal therefrom through the tubular arm; a mounting arm having one end secured to one end of the shaft which is secured at its other end to the contact-supporting plate; a mounting bracket pivotally secured to the other end of the mounting arm; electrical contact points mounted on the contact-supporting plate and adapted for movement between alternate positions for opening and closing an electrical circuit; and eccentric means secured to the drum and rotatable therewith in relation to said contact-supporting plate for periodically actuating said contact points during the revolution of the drum. An electrical lead extends from the contact points through the shaft attached to the contact-supporting plate and forms a portion of an electrical circuit which includes a switch and a distance indicating meter. Actuating means is connected to the mounting arm for pivoting this arm in the mounting bracket to move the drum between an operative position in contact with a rotating member, and a non-operative position out of contact therewith.
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