Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
229 words
An actuator for a power chuck, said actuator comprising: a hollow actuator housing having a rearwardly extending housing tube centered on an axis and having a closed rear end, said tube being formed with a pair of axially spaced and radially inwardly open grooves both having axial lengths equal at least to a predetermined axial distance, said tube further being formed at said grooves with respective radially throughgoing apertures; a piston subdividing the interior of said housing into a pair of compartments and having a stem extending axially rearwardly in said tube, said piston being axially displaceable in said housing through an axial stroke at most as long as said distance, said piston being formed with a pair of throughgoing passages each having one end opening at said stem into a respective one of said grooves and another end opening into a respective one of said compartments; means in said piston including a pair of check valves in said passages for prohibiting flow between said ends of said passages except when either of said passages is pressurized from the respective one end; and a collar surrounding said tube and rotatable thereon about said axis, said collar being formed with a pair of annular inwardly open grooves respectively aligned with said apertures and being provided with a pair of connections respectively opening into said inwardly open grooves of said tube.
Claim 2
Dependent Claim
229 words
An actuator for a power chuck, said actuator comprising: a hollow actuator housing having a rearwardly extending housing tube centered on an axis and having a closed rear end, said tube being formed with a pair of axially spaced and radially inwardly open grooves both having axial lengths equal at least to a predetermined axial distance, said tube further being formed at said grooves with respective radially throughgoing apertures; a piston subdividing the interior of said housing into a pair of compartments and having a stem extending axially rearwardly in said tube, said piston being axially displaceable in said housing through an axial stroke at most as long as said distance, said piston being formed with a pair of throughgoing passages each having one end opening at said stem into a respective one of said grooves and another end opening into a respective one of said compartments; means in said piston including a pair of check valves in said passages for prohibiting flow between said ends of said passages except when either of said passages is pressurized from the respective one end; and a collar surrounding said tube and rotatable thereon about said axis, said collar being formed with a pair of annular inwardly open grooves respectively aligned with said apertures and being provided with a pair of connections respectively opening into said inwardly open grooves of said tube.
Claim 3
Dependent Claim
14 words
The actuator defined in claim 1 wherein said radially inwardly open grooves are annular.
Claim 4
Dependent Claim
20 words
The actuator defined in claim 1 wherein said connections and apertures are spaced axially apart at least by said distance.
Claim 5
Dependent Claim
21 words
The actuator defined in claim 1 wherein the one end of one of said passages opens axially rearwardly on said stem.
Claim 6
Dependent Claim
33 words
The actuator defined in claim 4 wherein said piston is provided with an axially rearwardly projecting indicator rod, said closed rear end being formed with a throughgoing hole through which said rod passes.
Claim 7
Dependent Claim
15 words
The actuator defined in claim 1 wherein said housing, tube, and rear end are unitary.
Claim 8
Dependent Claim
31 words
The actuator defined in claim 1, further comprising seal means between said piston and said housing, both between said inwardly open grooves and between said inwardly open grooves and said compartments.
Claim 9
Dependent Claim
15 words
The actuator defined in claim 1 wherein said check valves are carried on said piston.
Claim 10
Dependent Claim
17 words
The actuator defined in claim 1 wherein said passages extend at least partially axially through said stem.
Claim 11
Dependent Claim
18 words
The actuator defined in claim 1 wherein said piston is nonrotatable about said axis relative to said housing.