Machine element or mechanism – Control lever and linkage systems – Hand operated
Patent
1994-06-23
1996-05-28
Lorence, Richard M.
Machine element or mechanism
Control lever and linkage systems
Hand operated
745015R, 745024, 745026, 192111A, 137843, F16C 122
Patent
active
055200672
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a check valve for hydraulic self-regulating device pistons which is particularly applicable to hydraulic self-regulating devices for regulating the length of control cables.
The known hydraulic self-regulating devices for compensation of variations of control cable lengths are constituted, in general, by an essentially cylindrical main hollow body containing a piston, a liquid fluid, a regulating rod attached at one end to the corresponding end of the control cable and a regulating spring which exerts a permanent pull on the control cable by way of the regulating rod.
Spanish patent P 9002014 discloses a hydraulic self-regulating device in which the regulating rod extends out from one end of the main body and is connected to the corresponding end of the control cable and the other end of the rod, which remains housed in the main body, is attached to a piston comprising a check valve which may have different embodiments. This piston defines in the main body two half-chambers respectively located one on each side of the piston.
One embodiment of said check valve disclosed in Spanish patent P 9002014 comprises a flow body, a stopper body and an opening spring. The flow body is attached to the regulating rod and is provided with orifices forming a communication between the two half-chambers defined in the main body by the piston, the flow body also having a perimetrical sealing gasket. The stopper body is coaxially disposed around the regulating rod and may slide in both directions so that, by means of a sealing gasket, it may open or close the flow body orifices. And the opening spring is permanently under compression and is arranged coaxially around the regulating rod between the flow body and the stopper body while bearing against the respective opposed faces.
In general, both the above described embodiment and the remaining embodiments of the piston check valve disclosed in Spanish patent P 9002014 suffer from the drawback of being formed by a large number of expensive-to-make components, which increases both the production costs and the assembly costs of the valve and, consequently, of the self-regulating device.
SUMMARY OF THE INVENTION
With a view to providing a new check valve embodiment which with a small number of components is capable of providing a solution for the above described problems, there is disclosed a check valve for hydraulic self-regulating device pistons of new structure and very high reliable operativeness.
The check valve of the invention is part of the piston of a hydraulic self-regulating device which includes: may be provided with a volumetric compensating device and at the other end, which is closed, fixing means, said main body containing a liquid fluid, a regulating rod and a regulating spring; closed end thereof and is attached to the corresponding end of the control cable, the length of which is to be permanently and automatically regulated and the other end of which is permanently housed inside the main body and is attached to the piston having the check valve and; under permanent compression, bearing at one end against the closed end of the main body and at the other end against the inner end of the regulating rod on an annular shoulder.
The check valve of the invention which, together with the piston, is attached to the end of the regulating rod remaining inside the main body of the self-regulating device. It comprises a flow body and a stopper body in which portion, the smaller diameter end of the frustoconical portion being longitudinally connected to the said cylindrical portion, the free end of which is firmly attached in longitudinal alignment with the inner end of the regulating rod, the frustoconical portion being provided with a lateral coaxial groove in which there is housed a flexible gasket, being formed on the front face or larger diameter base with a concave surface and, around the perimeter, with a plurality of guide projections so dimensioned that the flow body may snugly slide against the inner surfa
REFERENCES:
patent: 1028400 (1912-06-01), Stanton
patent: 2375050 (1945-05-01), Tauscher
patent: 2405062 (1946-07-01), Sheldon
patent: 3171526 (1965-03-01), Maclawek
patent: 3417768 (1968-12-01), Wasson
patent: 5341723 (1994-08-01), Hung
Fico Cables S.A.
Kim Chong H.
Lorence Richard M.
Striker Michael J.
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