Accumulator
First Claim
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1. An accumulator comprising:
- a casing having an inlet/outlet port;
a cylinder disposed in said casing;
a piston slidably disposed in said cylinder, said cylinder and one end of said piston jointly defining a reservoir of variable volume communicating with said inlet/outlet port and said piston having a coaxial recess extending from the other end of said piston to a bottom therein;
a piston ring held on an outer surface of said piston and lying in substantially the same plane as the inner surface of said bottom;
a piston rod axially movably disposed in said casing and having an end slidably fitted in said recess; and
a spring engaged with said piston rod for normally urging said piston rod toward said bottom to keep said end of said piston rod and said piston ring positioned in substantially the same position at all times with respect to a longitudinal axis of said piston to force said piston to reduce the volume of said reservoir.
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Abstract
An accumulator has a piston axially slidably disposed in a cylinder mounted in a casing, the cylinder and the piston jointly defining a reservoir communicating with an inlet/outlet port in the casing. A piston rod axially movably disposed in the casing has an end slidably fitted in the cylindrical hole of the piston. The piston rod is normally urged by a spring to force the piston into the reservoir. The accumulator also includes a switch mechanism for detecting the position of the piston in the cylinder. The switch mechanism may comprise a reed switch, a light-sensitive switch, a pressure-sensitive switch, or a pushbutton switch.
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Citations
12 Claims
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1. An accumulator comprising:
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a casing having an inlet/outlet port; a cylinder disposed in said casing; a piston slidably disposed in said cylinder, said cylinder and one end of said piston jointly defining a reservoir of variable volume communicating with said inlet/outlet port and said piston having a coaxial recess extending from the other end of said piston to a bottom therein; a piston ring held on an outer surface of said piston and lying in substantially the same plane as the inner surface of said bottom; a piston rod axially movably disposed in said casing and having an end slidably fitted in said recess; and a spring engaged with said piston rod for normally urging said piston rod toward said bottom to keep said end of said piston rod and said piston ring positioned in substantially the same position at all times with respect to a longitudinal axis of said piston to force said piston to reduce the volume of said reservoir. - View Dependent Claims (2, 3, 4)
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5. An accumulator comprising;
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a casing having an inlet/outlet port; a cylinder disposed in said casing; a piston axially slidably disposed in said cylinder, said cylinder and one end of said piston jointly defining a reservoir of variable volume communicating with said inlet/outlet port and said piston having a coaxial recess extending from the other end of said piston to a bottom therein; a piston ring held on an outer surface of said piston, said piston ring and the inner surface of said bottom being located in substantially the same plane; a piston rod axially movably disposed in said casing and having an end slidably fitted in said coaxial recess; a spring engaged with said piston rod for normally urging said piston rod to keep said end of the piston rod and said piston ring positioned in substantially the same position at all times with respect to the longitudinal axis of said piston to force said piston into said reservoir; and means for electrically detecting the position of said piston in said cylinder. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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Specification