Air gun with reciprocating shuttle
US4211300A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 22, 1979 |
| Grant date | Jul 8, 1980 |
| Priority date | — |
| Expiry date | Jan 22, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/137
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved air gun consists of an elongated cylindrical housing for containing a volume of compressed air that is closed at each end by end plates. A radially-positioned exhaust port is bored into the wall of the housing. A hollow, cylindrical shuttle, is mounted concentrically inside the housing for linear back-and-forth sliding motion in alternate strokes. The ends of the shuttle are closed by end faces. A radially positioned sealing pad has an orifice that is alignable with the exhaust port is supported by the shuttle. When the shuttle is at either end of a stroke, the sealing pad blocks the exhaust port. The space between each shuttle end face and the respective housing end plates form shuttle-actuation control chambers. A small air leak in each control chamber maintains the residual air pressure therein at ambient when the guns is inactive. To fire the gun, a small quantity of air is diverted by valving from inside the housing to one of the control chambers. The inrush of compressed air to the control chamber greatly exceeds the leakage rate of the air leak and accelerates the shuttle towards the opposite end of the housing. During passage from one end of the housing to the o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.