This technology is available from Temarex Corporation.
Title:WIRE ROPE WITH REDUCED INTERNAL CONTACT STRESSES
Disclosure 199 U.S. Patent 5,375,404
A stranded product is formed from a central wire and a plurality of wires helically wound around the central wire, wherein each of the wires helically wound around the central wire has a small longitudinal groove which increases the area of contact between each of the outer wires and the core wire, thus significantly reducing the internal contact stresses within the strand to extend the fatigue life of the strand without significantly reducing the bending flexibility of the strand.
A plurality of stranded products in accordance with the invention can be employed in a conventional manner to form ropes, cables, and the like, having an extended service life.
Title:METHOD OF TIGHTENING THREADED FASTENERS
Inventor(s): G. Bibel
Disclosure 169 U.S. Patent 5,278,775
The invention provides a method for tightening threaded fasteners in a flange joint or the like, which comprises initially tightening each fastener to a predetermined initial load or stress, measuring the final load, stress, strain or elongation of each fastener after all fasteners have been tightened, and calculating interaction coefficients from the experimental data thus obtained.
The interaction coefficients are representative of elastic interactions occurring between each fastener in the system, and enable an initial fastener strain value or load to be predicted for each fastener in the system.Using the predicted initial strain, stress or load values and the interaction coefficients for each fastener and applying an initial stress to each bolt in a second test in accordance with these calculations, allows updating of the interaction coefficient values along with the predictions of initial loads so as to enable calculation of preloads on each bolt which will yield essentially uniform bolt stress.
The method compensates for elastic interactions between fasteners in the system and is self-correcting to reduce effects of flange surface misalignment.
The invention covers all bolting pattern configurations such as cylindrical, rectangular, square, etc.In addition, the innovative process is not limited by the number of fasteners in the pattern, nor fastener or stud size.
The overall objective accomplished by this process is to provide a procedure to obtain uniform bolt loading in a single pass.This process will increase joint reliability and decrease bolt-up time on critical flanges.A side benefit from the uniform loading, in some applications, maybe the availability to select a lower cost gasket.
This technology is ideally suitable for nuclear reactor flanges, aerospace, automotive, truck, off road equipment, commercial construction and the like.
Title:ARM REHABILITATION AND TESTING DEVICE
Inventor(s):N. Reddy, J. Roman, J. Bulgrin
Disclosure 79 U.S. Patent 5,170,777
A motor driven arm rehabilitation device which includes a rotatable forearm support structure capable of being rotated back and forth through a predetermined arc at a predetermined speed and with a predetermined force applied, and a fluid motor such as a rotary actuator for rotating this support structure.Rotation of the supporting structure causes alternate flexion and extension of the patient's arm.The arc of rotation, frequency of rotation and force applied can be varied in accordance with the patient's needs.Associated with the forearm supporting structure is a wrist stabilizer which causes alternate pronation and supination of the wrist as the forearm is alternately flexed and extended.The device also has an upper arm supporting structure.
This invention is suitable as a rehabilitation and testing apparatus for use by patients suffering from flaccid or spastic reaction in the muscles of the arm due to nerve damage as a result of head injury or stroke.The apparatus should provide a means by which the range of motion of the arm can be maintained to preclude atrophy of muscles.In this way, the patient can optimize recovery from the nerve damage by maintaining a full range of motion in the arm in a convenient and accessible manner.