Miniature herringbone gears Image credit: Run Ryder | Perpendicular herringbone gears Image credit: Wikimedia | Crossed double helix gear Image credit: 1 DKM 2B. Herringbone gears, also called double helical gears, are gear sets designed to transmit power through parallel or, less commonly, perpendicular axes. The unique tooth structure of a herringbone gear consists of two adjoining, opposite helixes that appear in the shape of the letter 'V'.
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Use the following DIRECTV phone numbers to contact the Answer Center for customer support: General Customer Service. 1-855-679-4357. Existing customers may call this number for general support from 8 a.m. to 1 a.m., 7 days a week. Technical Support. 1-855-679-4357. Technical support is available for existing customers 24 hours a day, 7 days a week. Customer Service for the Hearing Impaired. 1-800-779-4388 (with a TTY compatible device) Hearing-impaired customers can call this number for support if they have a TTY compatible device.