Abstract: A drive system including a partition wall; a drive device positioned on a first side of the partition wall, wherein the drive device includes at least one first member positioned on said first side of said partition wall. An actuator for actuating the drive device, where the actuator is positioned on a second side of the partition wall so that the partition wall is between the drive device and the actuator, and where the actuator includes at least one second member positioned on the second side of said partition wall. The second member of the actuator is magnetically coupled to the first member of the drive device, where movement of the second member causes movement of the first member, and to a device including a drive system.
February 9, 2012
Date of Patent:
October 15, 2013
Agency for Science, Technology and Research
Abstract: Hermetic gate valves and globe valves having a bonnet assembly that does not require stem packing and includes a harmonic drive and locking mechanism. The bonnet assembly includes a main body which is sealingly engaged on the valve body and includes an elongate tubular portion that completely encloses the valve stem and has a sidewall with an internally threaded portion formed of a material so as to be relatively flexible radially inward toward the valve stem, and is surrounded by an outer sleeve having a sidewall formed of a material so as to be relatively rigid radially and defining an annulus therebetween.
Abstract: A drive crank shaft and a load shaft with an eccentrically placed center shaft coupler form a mechanical torque transferring structure. Two convoluted rubber seals mounted on a center shaft coupler, a drive shaft support an a load shaft support enclose the working fluid to form double hermetic sealing. The rubber seals exert enough force against twisting to hold the center shaft coupler and prevent the center shaft coupler from rotating around its center. Two balance weights are mounted on both crank shafts symmetrically to eliminate vibration due to eccentric configuration. An enclosed housing prevents fluid from leaking into the environment. A sensor is used to detect the leakage and control the operation. This rotary shaft sealing device provides dynamically hermetic sealing by eliminating a leaking path for the pressurized working fluid.
Abstract: Embodiments of the present invention are directed to a linear motion flexural apparatus to provide friction-free linear travel for large stroke motion. In one embodiment, a linear motion flexural apparatus comprises a first member having a first surface, and a second member having a second surface which is spaced from the first surface of the first member. One of the first member and the second member is movable relative to another one of the first member and the second member in a linear direction. At least one sheet is disposed between the first surface of the first member and the second surface of the second member. Each sheet has a first edge portion and a second edge portion generally opposite from the first edge portion. The first edge portion is attached to the first surface of the first member. The second edge portion is attached to the second surface of the second member.
April 11, 2003
Date of Patent:
August 8, 2006
Lockheed Martin Corporation
Donald F. Zacharie, Kenneth R. Lorell, Jean-Noel Auburn