Fail-safe selectivfe self-locking actuator
US10711872B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 2018 |
| Grant date | Jul 14, 2020 |
| Priority date | — |
| Expiry date | Nov 14, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C13/50
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A selectively self-locking actuator includes a threaded shaft having a first threaded portion and a second threaded portion. The first threaded portion includes a semicircular ball screw threadform and the second threaded portion includes a power screw threadform. The actuator further includes a ball nut mated to the first threaded portion, a split nut selectively mated with the second threaded portion, and a nut coupler plate configured to secure the ball nut and split nut at a fixed distance from each other. The split nut includes at least a first split nut portion and a second split portion each mated to a spring and a driver. The spring is configured to bias the first split nut portion and the second split nut portion either radially inward or radially outward with respect to the threaded shaft, and wherein the driver is configured to selectively oppose the bias of the spring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.