Apparatus for displacing a piston in a chamber having a torque resistor
First Claim
1. Apparatus for displacing a piston in a chamber comprisinga support member,a motor including a housing and a driving member that is mounted within said housing and rotates relative to said housing about a driving axis, said driving member being rotatably mounted with respect to said support member, said housing being mounted on said support member, for limited relative rotation therewith,a torque resistor means connected between said motor housing and said support member so as to limit relative rotation between the two except when the torque between the two exceeds a predetermined amount,a piston driver including a driven portion threadedly connected to said driving member and a displacement portion that is axially displaced in response to relative rotation between said driving member and said driven portion, anda housing rotation detector means to detect when said housing rotates relative to said support member, indicating resistance to axial movement of said piston driver.
4 Assignments
0 Petitions
Accused Products
Abstract
Apparatus for displacing a piston in a chamber comprising a support member, a motor including a housing and a driving member that rotates relative to the housing and a driving axis, the driving member being rotatably mounted with respect to the support member, a torque resistor between the motor housing and the support limiting relative rotation between the two except when the torque between the two exceeds a predetermined amount, a piston driver including a driven portion threadedly connected to the driving member and a displacement portion that is axially displaced in response to relative rotation between the driving member and the driven portion, and a housing rotation detector to detect when the housing rotates relative to the support, indicating resistance to axial movement of the piston driver.
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Citations
11 Claims
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1. Apparatus for displacing a piston in a chamber comprising
a support member, a motor including a housing and a driving member that is mounted within said housing and rotates relative to said housing about a driving axis, said driving member being rotatably mounted with respect to said support member, said housing being mounted on said support member, for limited relative rotation therewith, a torque resistor means connected between said motor housing and said support member so as to limit relative rotation between the two except when the torque between the two exceeds a predetermined amount, a piston driver including a driven portion threadedly connected to said driving member and a displacement portion that is axially displaced in response to relative rotation between said driving member and said driven portion, and a housing rotation detector means to detect when said housing rotates relative to said support member, indicating resistance to axial movement of said piston driver.
Specification