Reciprocating apparatus with a controllable dwell time at each end of the stroke
US4002103A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 1, 1974 |
| Grant date | Jan 11, 1977 |
| Priority date | — |
| Expiry date | Jul 1, 1994 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L29/00
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The piston of a pneumatic cylinder is reciprocated with a controllable dwell time at each end of its stroke, under the control of a digital fluidic circuit which responds to the termination of exhaust flow at the end of each piston stroke to initiate the reverse piston stroke. The air for driving the piston is supplied alternately to opposite ends of the piston through respective cylinder ports, by way of a corresponding pair of pilot valves which are controlled by the fluidic circuit so that one or the other of the pilot valves may supply driving air to the piston at any time. Whenever the piston is in motion, a stream of exhaust air flows through the exhaust port ahead of the piston, and this exhaust stream acts through the fluidic control circuit to maintain the pilot valves in their then-existing states; when the exhaust stream stops at the end of a piston stroke, the fluidic circuit responds to produce a pneumatic pulse delayed by a controllable time with respect to termination of exhaust flow, and this delayed pulse triggers a two-state fluidic device to its opposite state; this in turn reverses the states of the pilot valves so that the other pilot valve now supplies driving…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.