Combined linear and rotary actuator and floating ring gear
US4409888A · kind A · utility
Inventor
Key dates
| Filing date | May 2, 1980 |
| Grant date | Oct 18, 1983 |
| Priority date | — |
| Expiry date | May 2, 2000 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B15/063
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A ring gear of a helically splined rotary actuator is separately and independently joined to the outer cylindrical body of the actuator and meshes with the splined piston sleeve of the rotary actuator. The outer cylindrical body is a smooth, continuous body. In one form of the invention, the ring gear is secured to the outer cylindrical body with flush mountings so that the entire body can be slid past end seals of a hollow boom or further outermost cylindrical tube. In a preferred embodiment, the ring gear is loosely joined to the outer cylindrical body so that it can conform to irregularities or tolerance errors in the splines of the piston sleeve and can accommodate bending in the outer cylindrical body or the rotary output shaft due to heavy bending loads on the actuator. Another feature of the invention is a combined linear and helically splined rotary actuator which can provide both rotary and linear movement relative to an output shaft and an outer boom tube; and in the preferred embodiment of this feature of the invention, the ring gear for the helically splined rotary actuator is a separate, independently mounted ring gear with a flush mounting on the other surface of the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.