Dual dial rod speed changing indicator
US6397700B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 2000 |
| Grant date | Jun 4, 2002 |
| Priority date | — |
| Expiry date | Nov 24, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/20438
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A dual dial rod speed changing indicator comprises a base board, a wire hub seat, an advancing member, and a withdrawing member. The wire hub seat is acted on by a bias force and pivoted to the base board. The wire hub seat has a first ratchet tooth portion and a second ratchet tooth portion. The advancing member comprises an advancing dial rod and an advancing ratchet pawl pivoted to the dial rod. The advancing dial rod is pivoted to the base board such that the advancing dial rod meshes with the first tooth portion at the time when the advancing dial rod is exerted on by an external force, thereby actuating the wire hub seat to turn and advance. The withdrawing member comprises a locating ratchet pawl and a withdrawing dial rod, which are pivoted with the base board. The withdrawing dial rod has a locating tooth which meshes with the second tooth portion to locate the wire hub seat at the time when the withdrawing dial rod turns on the base board. The wire hub seat is acted on by the bias force to turn in reverse to withdraw.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.