wiper (redirected from contact arm)

wiper

1. any piece of cloth, such as a handkerchief, towel, etc., used for wiping

2. a cam rotated to ease a part and allow it to fall under its own weight, as used in stamping machines, etc.

3. See windscreen wiper

4. Electrical engineering a movable conducting arm, esp one in a switching or selecting device, that makes contact with a row or ring of contacts

---

wiper [′wī·pər]

(electricity)

That portion of the moving member of a selector, or other similar device, in communications practice, which makes contact with the terminals of a bank.