Fluid pressure actuator and actuator system
AssigneeLucas Industries Limited
InventorsStephen Harlow Davies, Alan Terry Rollason
Life of this patent
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Abstract
A fluid pressure-operated actuator comprises a cylinder body containing a piston slidable therein, the piston defining respective chambers at opposite sides thereof. A rod projects from one side of the piston and extends through an end wall of the cylinder and a plunger is slidable on the rod and also extends through the end wall. The arrangement is such that the application of fluid pressure simultaneously to the chambers results in movement of the piston lengthwise of the rod, the piston movement including a first part during which the plunger applies force to the rod in addition to that arising on the piston, and a second part during which the force from the plunger is absent.
Claims14
A fluid pressure-operated actuator comprising a cylinder body containing a piston slidable therein, respective chambers formed at opposite sides of the piston, an end closure wall of the cylinder body partially defining one of said chambers, a rod projecting from one side of the piston and extending through said end closure wall, a plunger slidable on the rod within said one chamber and extending through said end closure wall, the arrangement being such that application of fluid pressure simultaneously to the chambers results in movement of the piston in the lengthwise direction of the rod in one direction, said piston movement including a first part during which the plunger applies force to the rod in addition to that arising on the piston, and a second part during which no force is applied from the plunger to the rod.
A fluid pressure-operated actuator comprising a cylinder body containing a piston slidable therein which defines respective chambers at its opposite sides, a rod projecting from one side of the piston and extending through an end wall of the cylinder, a plunger slidable on the rod and extending through the end wall, the arrangement being such that application of fluid pressure simultaneously to the chambers results in movement of the piston in the lengthwise direction of the rod, the piston movement including a first part during which the plunger applies force to the rod in addition to that arising on the piston, and a second part during which the force from the plunger is absent, wherein the rod carries an abutment against which the plunger engages during the first part of the piston movement.
A fluid pressure-operated actuator comprising a cylinder body containing a piston slidable therein which defines respective chambers at its opposite sides, a rod projecting from one side of the piston and extending through an end wall of the cylinder, a plunger slidable on the rod and extending through the end wall, the arrangement being such that application of fluid pressure simultaneously to the chambers results in movement of the piston in the lengthwise direction of the rod, the piston movement including a first part during which the plunger applies force to the rod in addition to that arising on the piston, and a second part during which the force from the plunger is absent, wherein the plunger is sealingly engaged around the rod and within the cylinder wall.
Dependencies are inferred from the claim text.