Valves and valve actuation – With correlated flow path – Valve operated by joining flow path sections
Patent
1995-04-17
1996-08-20
Chambers, A. Michael
Valves and valve actuation
With correlated flow path
Valve operated by joining flow path sections
285313, 285316, F16L 3728
Patent
active
055471668
DESCRIPTION:
BRIEF SUMMARY
It is well-known that by the use of pneumatic tools it frequently occurs that one has to remove the tool or perhaps to change to any other tool. The hose coupling which then connects the pneumatic tool with a hose from the pneumatic system is then released. By the release arises then a very high bang and the hose together with the hose coupling nipple move backwards with a very big power. This happens due to the overpressure in the hose leading to the tool is discharged unrestrictedly. It is experienced by many people as tremendous unpleasant that the hose with its nipple rushes away vigorously and uncontrolled with a big bang. Primarily within the industry, where the tools really have a high working pressure and where changes of tools often occur. Unlike other safety systems against this unpleasant effect this construction is designed so, that the existing standardized series of equipment can be used, and to meet the requirement that only one-hand grip shall be needed for quick and uncomplicated changes.
The purpose of the construction is thus to prevent the unpleasant bang that is created at changes of tools and to lock the nipple inside the coupling during the time the overpressure in the hose disappears. It is also important that the construction is adapted to already existing standardized series of equipment. The change of the potential tool shall also be just as fast and easy as at already existing standardized series.
The invention will be described hereinafter with reference to the enclosed figures wherein
FIG. 1 shows the hose coupling totally disconnected.
FIG. 2 shows the hose coupling during connection.
FIG. 3 shows the hose coupling totally connected.
FIG. 4 shows the hose coupling during disconnection.
The male member (1) is inserted into the coupling (2). Then the front cam (3) on the male member (1) engages the ball (4) and pushes the ball away due to the fact that there is space downwards (5, the spline). After the male member cam (3) has passed the ball, the so called locking pawl's front cam (7) will be forced upwards, at the same time as the rear cam (8) is pressed downwards. A so called seesaw-effect has arisen. The rear cam (8) then grips an axially resilient ring (9). When the male member (1) now is pressed inwards, the entire nonreturn valve (10) at the same time is pressed backwards, but the axially resilient ring (9) is still kept fixed by the locking pawls. The more the male member is pushed in, the higher resilient pressure is built up in the ring (9), which is retained by the rear cam (8) on the locking pawl. When the ring (9) now has an axial resilient pressure backwards, it strives to press the rear cam (8) upwards and the front cam (7) downwards. This can not happen before the male member is far enough inside, so that the front cam (7) can fall down into the spline (11) in the male member. At the same time as the front cam falls down in the spline, the resilient ring (9) is pushed backwards and urges the rear cam (8) upwards. The locking is now completed. See FIG. 3.
The front cam (7) now lies in the spline (11) and retains the male member (1). The male member is now locked and strives backwards due to the nonreturn valve (10), which now is open and spring-loaded (12) and presses the male member backwards. The locking pawl (6) is now subjected to an inverted seesaw-effect. The front cam (7) is now pressed upwards and the rear cam (8) is pressed downwards. But as shown in FIG. 3 we can see that the resilient ring (9) lies in such a position that the cams of the locking pawl can not move in any direction. The male member is locked. In order now to free the male member (see FIG. 4) from the pneumatic system, the sleeve (13) that surrounds the coupling now must be pulled backwards. The sleeve (13) has a resilient resistance when it is pressed backwards. When the sleeve (13) now is pulled backwards, the turned out spline (5) also will move backwards. The spline (5) will be right in front of the upper stud (15) on the locking pawl. The result of this now will be that the tendency
REFERENCES:
patent: 2888278 (1959-05-01), Torres et al.
patent: 2952482 (1960-09-01), Torres
patent: 4685490 (1987-08-01), Medvick
patent: 4982761 (1991-01-01), Kreczko et al.
Chambers A. Michael
Hochberg D. Peter
Jaffe Michael
Kusner Mark
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