Pivotal positioning servoactuator
First Claim
1. In positioning apparatus having a support member and a movable member arranged adjacent said support member, the improvement which comprises:
- means providing a pivotal axis about which said movable member is pivotal relative to said support member; and
at least one positioning means operatively arranged to cause said movable member to pivot about said pivotal axis, each of said positioning means includinga first cylinder means fixed to one of said members and arranged with its longitudinal axis offset with respect to said pivotal axis,a first piston means fixed to the other of said members, said first piston means being sealingly arranged in said first cylinder means for movement relative thereto along a first circular path about said pivotal axis, said first piston means defining with said first cylinder means a first operating chamber, andvalve means selectively operable to control the flow of fluid with respect to said first chamber;
whereby movement of said first piston means relative to said first cylinder means along said first path effects pivotal movement of said movable member relative to said support member about said pivotal axis.
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Accused Products
Abstract
A two-axis positioning servoactuator includes a support, a movable member arranged adjacent the support for independent pivotal movement relative thereto about each of two perpendicular intersecting axes, a pair of differential piston and cylinder actuators operatively interposed between the support and movable member for effecting such angular movement about each of the axes, an electrohydraulic servovalve for each of the actuators and operatively associated therewith to control the same, and means providing a position feedback signal to the corresponding servovalve for effecting controlled movement of the member about each of the axes.
6 Citations
8 Claims
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1. In positioning apparatus having a support member and a movable member arranged adjacent said support member, the improvement which comprises:
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means providing a pivotal axis about which said movable member is pivotal relative to said support member; and at least one positioning means operatively arranged to cause said movable member to pivot about said pivotal axis, each of said positioning means including a first cylinder means fixed to one of said members and arranged with its longitudinal axis offset with respect to said pivotal axis, a first piston means fixed to the other of said members, said first piston means being sealingly arranged in said first cylinder means for movement relative thereto along a first circular path about said pivotal axis, said first piston means defining with said first cylinder means a first operating chamber, and valve means selectively operable to control the flow of fluid with respect to said first chamber; whereby movement of said first piston means relative to said first cylinder means along said first path effects pivotal movement of said movable member relative to said support member about said pivotal axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification