Oil damped solenoid valve

Claim 1

IN A SOLENOID DEVICE, A SOLENOID CHAMBER COMPRISING A CLOSED-TOP PLUNGER-RECEPTACLE; A PLUNGER MOVABLE ALONG THE RECEPTACLE TOWARD AND FROM THE TOP THEREOF, A GENERALLY CUP-SHAPED BOOT HAVING FREELY FLEXIBLE WALLS THAT CONVERGE DOWNWARDLY AND INWARDLY FROM THE RIM AT THE UPPER END TO THE BOTTOM, MEANS CONNECTING THE UPPER RIM END OF THE FLEXIBLE BOOT TO THE RECEPTACLE, AND THE PLUNGER ENGAGING THE MIDDLE OF THE BOOT AT A POINT LOCATED A SUBSTANTIAL DISTANCE DOWNWARDLY FROM THE RIM; THE BOOT, THE RECEPTACLE AND THE PLUNGER BEING SEALED AND FIXED TOGETHER AND PROVIDING A CHAMBER, THE CHAMBER BEING DIVIDED INTO AN UPPER CHAMBER PORTION ABOVE THE PLUNGER AND A LOWER CHAMBER PORTION BETWEEN THE RECEPTACLE AND THE BOOT, THE LOWER CHAMBER HAVING ITS UNDER PARTS FORMED BY THE BOOT WITH A DOWNWARDLY AND INWARDLY CONVERGING SHAPE SO THAT THE LOWEST PART HAS A CROSS SECTION THAT GRADUALLY INCREASES UPWARDLY TO AN ENLARGE TOP; A LIQUID THAT, WITH THE PLUNGER, COMPLETELY FILLS THE ENTIRE CHAMBER; MEANS PROVIDING A RESTRICTED LIQUID FLOW PATH BETWEEN THE UPPER AND LOWER CHAMBER PORTIONS; THE WALLS OF THE BOOT BEING FLEXED OUTWARDLY WHEN THE PLUNGER IS MOVED UPWARDLY, THE SHAPE OF THE BOOT BEING SUCH THAT WHEN THE PLUNGER IS DOWN THE WALLS ARE OUT OF CONTACT WITH THE PLUNGER, AND WHEN IT IS UP THE BOOT RAISES THE LOWEST PART OF THE BOOT UPWARDLY IN THE SMALLEST SECTIONAL AREA OF THE BOOT DISPLACING LIQUID THEREFORM TO THE UPPER PART OF THE BOOT WHERE THE SECTION IS LARGER, AND LIQUID FROM THE UPPER CHAMBER PORTION IS DISPLACED TO CAUSE LIQUID TO ENTER THE LARGE UPPER PORTION OF THE BOOT, THE ARRANGEMENT BEING SUCH THAT THE BOOT CAN RECEIVE THIS ADDED LIQUID WITHOUT SUBSTANTIAL STRETCHING.