Pneumatic hydraulic retractable device
US11933330B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 2023 |
| Grant date | Mar 19, 2024 |
| Priority date | — |
| Expiry date | Jun 15, 2043 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F9/56
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A pneumatic hydraulic retractable device includes a fluid pressure cylinder having a cylinder body and a plug seat disposed in the cylinder body, a piston rod movably disposed in the fluid pressure cylinder, a control valve set having a valve seat disposed at the piston rod and forms an upper fluid chamber and a lower fluid chamber with the cylinder body therebetween, and a valve rod disposed in the valve seat for controlling communication between the upper and lower fluid chambers, and a pressure relief element forming a pressure relief gap with the piston rod. The pressure relief gap communicates with the lower fluid chamber through a communication portion of the pressure relief element. As such, when the valve rod is opened, the fluid is allowed to flow between the lower fluid chamber and the pressure relief gap through the communication portion for reducing airtight effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.