Patent ID: 9709393
Date: 2017-07-18
CPC Classifications: G01C

Claim:
1. A marking device, comprising: a backplate having a first channel and a second channel disposed on the backplate so as to face the first channel; a central gear operatively connected to the backplate and configured for rotation relative to the backplate; and a first extendable arm disposed at least partially within the first channel and a second extendable arm disposed within the second channel; and a hole positioned at a central axis of the central gear, and a coextensive hole positioned in the backplate at the central axis of the central gear so that an opening is formed through the central gear and the backplate; and wherein the first extendable arm and the second extendable arm are operatively connected to the central gear so that movement of either the first extendable arm or the second extendable arm is imparted to the other extendable arm.