Motors: expansible chamber type – With motive fluid valve – To provide unequal inlet and exhaust flow rates to single...
Patent
1984-12-11
1988-05-03
Look, Edward K.
Motors: expansible chamber type
With motive fluid valve
To provide unequal inlet and exhaust flow rates to single...
91450, 91454, 91461, 91463, F15B 1108, F16K 1706
Patent
active
047412496
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an automatic device for economizing compressed air.
2. Related Art
French Pat. No. 82 05 042 and its certificate of addition No. 83 03 513 cover a compressed air economizing device permitting the driving fluid pressure of a user-apparatus such as a cylinder actuator to be adjusted to a pressure lower than the pressure in the distribution network.
That device comprises a means of ensuring passage of the fluid under pressure during most of the stroke of the cylinder's moving element and blocks passage of the pressurized fluid before or at the end of the stroke of said moving element.
The certificate of addition, No. 83 03 513, describes such an economizing device constructed in the form of a single-unit fitting readily mountable on a cylinder, a pipe or a directional valve, which can be built very simply and cost-effectively.
OBJECTS AND SUMMARY OF THE INVENTION
The present invention is directed to an improved economizing device of the same type incorporated in a single-unit fitting designed to equip only one chamber of a double-acting cylinder.
The invention accordingly provides a device consisting of a fitting having a first circuit connecting a fluid supply pipe to a cylinder chamber. The first circuit is controlled by a valve which moves with a piston slidably driven by an elastic means within the fitting. The piston is actuated by the presence or absence of a pressure signal. The fitting has a second circuit short-circuiting the first circuit and connecting a fluid exhaust pipe to the cylinder chamber. The second circuit is controlled by a check valve and the top of the fitting is provided with a means for adjusting the tension of the elastic means and pursuant, the speed of the cylinder's moving element.
This device permits stopping the supplying of fluid to the cylinder before, or at, the end of the piston stroke and also permits adjusting the speed of the piston to suit the work required.
Control of the check valve is obtained either by the drop in pressure of the exhaust fluid or by a pressure signal generated by an end-of-travel detector in the cylinder.
BRIEF DESCRIPTION OF THE DRAWINGS
Other features and advantages of the invention will be more readily understood in reading the following description of several embodiments with reference to the appended drawings in which:
FIG. 1 is a cutaway view, taken longitudinally, of a single-unit economizing device of the pressure drop type, connected to one end of a cylinder actuator;
FIG. 2 is a cutaway view of an economizing device identical to that of FIG. 1 and comprising only one valve operating in both directions;
FIG. 3 is a cutaway view of an alternative embodiment of the device in FIG. 1;
FIG. 4 is a cutaway view of an economizing device with axially aligned pipes;
FIG. 5 is a cutaway view of an alternative embodiment of the device in FIG. 4;
FIG. 6 is a cutaway view of an economizing device fitted to an apparatus and specifically to a directional valve;
FIG. 7 is a cutaway view of an economizing device sandwiched between two apparatuses;
FIG. 8 is a cutaway view of an economizing device wherein the piston contains a passage for the exhaust fluid;
FIG. 9 is a cutaway view of an economizing device containing a normally-closed valve actuated by pressure drop;
FIG. 10 is a cutaway view of a variant of FIG. 9;
FIG. 11 is a cutaway view of an economizing device with a normally-closed valve actuated by a pressure signal;
FIG. 12 is a cutaway view of an economizing device with a normally-closed valve actuated by a pressure signal;
FIG. 13 is a cutaway view of a variant of the device shown in FIG. 12;
FIG. 14 is a cutaway view of an economizing device with a normally-open valve actuated sideways by a pressure signal;
FIG. 15 is a cutaway view of a variant of the device shown in FIG. 14, with axially aligned ports; and
FIG. 16 is a cutaway view of a variant of the device shown in FIG. 8, actuated by a pressure signal.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
F
REFERENCES:
patent: 2858840 (1958-11-01), Wright
patent: 3010432 (1961-11-01), Robra et al.
patent: 3125319 (1964-03-01), Arbogast et al.
patent: 3566747 (1971-03-01), Frame
patent: 4416187 (1983-11-01), Nystrom
patent: 4608910 (1986-09-01), Levenez et al.
Look Edward K.
Societe Anonyme Styled LEGRIS
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