Patent ID: 6863260
Filing Date: 2005-03-08
Classification: F02M,F15B,F16K

Abstract:
1. A multi-chambered piston actuator, comprising: a cover comprising a planar surface having a first cavity extending into the inner planer surface, the first cavity defined by a first inner wall having a first cross-sectional area and a recessed cavity wall; a housing comprising a second cavity, the second cavity comprising a second inner wall defining a second cross-sectional area, a third inner wall defining a third cross-sectional area, a first end wall defining a boundary between said second inner wall and said third inner wall, and a second end wall defining a bottom of the cavity and having a cross-section substantially similar to said third cross-sectional area, the housing further comprising a first port and a second port; and a piston comprising a shaft, the shaft comprising a first shaft end having a cross-section substantially similar to said first cross-sectional area for insertion into said first cavity, a second shaft end having a cross-section substantially similar to said third cross-sectional area, said piston further comprising a tier extending radially from said shaft, said tier having a cross-sectional area substantially similar to said second cross-sectional area, the tier further having a top surface, a bottom surface, and an outer wall; wherein the first port is connected to a first chamber formed by said tier top surface, said second inner wall, said planar surface, and a shaft surface, and the second port is connected to a second chamber formed by said tier bottom surface, said second inner wall, said shaft surface, and said first end wall.