Expansible chamber devices – Displacement control of plural cylinders arranged in... – Adjustable abutment positioned within working chamber
Patent
1991-08-21
1993-03-02
Denion, Thomas E.
Expansible chamber devices
Displacement control of plural cylinders arranged in...
Adjustable abutment positioned within working chamber
92 13, 92131, 92135, 74335, F01B 3114
Patent
active
051899426
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a 3-position actuator which moves linearly by means of fluid.
BACKGROUND ART
In a 3-position actuator which moves linearly by means of fluid, it is difficult to precisely locate a neutral position by a simple mechanism so that a cylinder with double structure has hitherto been used.
In the structure employing the above cylinder with double structure, its construction has been complicated size and heavy in weight.
DISCLOSURE OF THE INVENTION
In order to solve the above problem, this invention provides a 3-position actuator having a moving body comprising a piston slidingly reciprocating for a specified distance in an axial direction within a casing, and a piston rod which moves integrally with the piston and a part of which protrudes out of said casing, said moving body being moved to one end side when fluid flows into a first fluid chamber through a first port formed on said casing, and said moving body being moved to the other end side when fluid flows into a second fluid chamber through a second port formed on said casing; characterized by that a pair of stoppers are installed in said casing with a specified clearance left between them in the axial direction, a pair of spring seats and a spring are installed between the pair of stoppers, said spring is located between the pair of spring seats to press one-side spring seat against said one-side stopper and to press the other-side spring seat against said other-side stopper, a pair of stopping portions are provided on said moving body in a projecting manner with a specified clearance left between them in the axial direction, said one-side stopping portion mates with said one-side spring seat from a side opposite to the spring under a state where said one-side spring seat contacts with said one-side stopper, and said other-side stopping portion mates with said other-side spring seat from the side opposite to the spring under a state where said other-side spring seat contacts with said other-side stopper.
In this invention, the spring presses the one-side spring seat against the one-side stopper and the otherside spring seat against the other-side stopper, under a neutral state. The one-side stopping portion mates with the one-side spring seat from a side opposite to the spring under the state where the one-side spring seat contacts with the one-side stopper. The otherside stopping portion mates with the other-side spring seat from the side opposite to the spring under the state where the other-side spring seat contacts with the otherside stopper.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional view of a 3-position actuator in an embodiment of this invention.
FIG. 2 and FIG. 3 are sectional views for explaining a function of the 3-position actuator.
FIG. 4 is an explanatory view of example of use of the 3-position actuator.
FIG. 5 is a sectional view of a 3-position actuator of another embodiment.
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of this invention will be described hereunder with reference to FIG. 1 through FIG. 3.
FIG. 1 is the sectional view of the 3-position actuator in the embodiment of this invention and shows a neutral state. A casing 1 is composed of a cylindrical casing body 2, a blocking member 3 inserted in one end of the casing body 2, and a blocking member 4 screwed in the other end of the casing body 2. A seal ring 5 contacting with an inner periphery of the casing body 2 is fitted onto an outer periphery of the blocking member 3, and a seal ring 6 contacting with an inner periphery of the casing body 2 is fitted onto an outer periphery of the blocking member 4. A snap ring 7 for inhibiting the blocking member 3 from slipping off is fitted in an inner periphery of the one end of the casing body 2. A through hole 8 is formed on the blocking member 3 at its central part in the axial direction, and female threads 9 are formed on a peripheral wall of the through hole 8. A through hole 10 bent approximately into an L-shape is formed on the blocking member 4, and fema
REFERENCES:
patent: 3143042 (1964-08-01), Borgeson et al.
patent: 3168854 (1965-02-01), Neilson
patent: 3991661 (1976-11-01), Mocha
patent: 4033233 (1977-07-01), Toi
patent: 4585024 (1986-04-01), Esseniyi
patent: 4669567 (1987-06-01), Nakamura et al.
patent: 5012725 (1991-05-01), Leary
Denion Thomas E.
Kabushiki Kaisha Daikin Seisakusho
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