875 results about "Torsional Forces" patented technology

A force-sensing catheter for diagnosing or treating the vessels found within a body or body space includes a center strut that is bonded, preferably thermally, along its longitudinal axis with the thermoplastic tubular member within which it is housed. The tubular member preferably has three layers: an inner layer, a braided layer and an outer layer. One or more semiconductor or metallic foil strain gages are affixed to the center strut in order to provide a measure of the bending and torsional forces on the distal tip of the catheter. Temperature compensation is achieved by having a temperature sensor near the strain gages and calibrating the catheter over a range of temperatures.

The invention discloses a folding rotor-type unmanned aerial vehicle. The folding rotor-type unmanned aerial vehicle can be folded compactly and unfolded quickly, so that the application flexibility of the rotor-type unmanned aerial vehicle is enhanced effectively. The unmanned aerial vehicle comprises a main body, four rotor arms and a landing gear, wherein each rotor arm is folded and unfolded reliably through a hinge mechanism and a limiting and locking mechanism. When the unmanned aerial vehicle is in a folded state, the rotor arms are positioned in axial grooves in the main body, a torsion spring in the hinge mechanism is compacted, and a limiting and locking piece is positioned at a locked position under the action of a reset spring. When the rotor arms of the unmanned aerial vehicle are required to be unfolded, the limiting and locking piece is driven to slide through a stirring piece along the circumferential direction of the main body, so that the rotor arms are unlocked; the rotor arms are driven to fall quickly by the torsion spring under the effect of torsional force and are limited in a horizontal state. After the rotor arms are unfolded completely, the stirring piece is released, and the limiting and locking piece is returned to the locked position under the effect of the reset spring, so that the rotor arms in an unfolded state are limited and locked.

A self-cleaning socket for contacting terminals on a microelectronic device wherein the first end of compliant tubular contactors rotate and wipe against terminals urged downwardly against the first end of the contactors. A rotational wipe of a contactor against a mating terminal breaks through any surface contamination layers on the terminal, thereby producing good electrical contact therebetween. Rotation of the first end of a contactor is caused by a downward deflection of a collar supported by two or more helical legs along a midsection of the contactor. Deflection of the collar distorts the resilient helical legs, each of which exerts a force on the collar which add up to produce a torsional force on the collar, thereby providing a rotational wipe in response to a downward urging of a terminal against the contactor. A void along the axis of the tubular contactor provides a reservoir to hold debris dislodged from the terminal and to keep the debris from interfering with operation of the contactor.

A delivery device for an implantable medical device having at least one retention member at an end thereof includes a shaft extending in a longitudinal direction, an elongated sheath surrounding a longitudinal portion of the shaft, a compartment defined inside of the sheath and adapted to receive the medical device in an assembled condition, a retainer positioned at one end of the compartment, and at least one acceptance in the retainer adapted to receive the retention member of the medical device in the assembled condition. The sheath is slidable relative to the shaft in the longitudinal direction to uncover and deploy the medical device. The retainer may be rotatable relative to the shaft to reduce torsional forces in the medical device during delivery and deployment. The retainer may have at least one recess facing the compartment for receiving a strut at an end of a stent of the medical device.

A multiplexed torque brake (MTB) system for preventing the accumulation of torsional forces at a center drive and thereby significantly reducing the design load requirements for trough frames of a corresponding solar concentrator assembly (SCA). In one embodiment, an MTB system for an SCA having a plurality of solar reflector frames spaced along a length of the SCA includes a plurality of brake mechanisms arranged at locations spaced apart from each other along the length of the SCA, each of the brake mechanisms coupled to a corresponding one of a plurality of supporting pylons and configured to constrain the solar reflector frames from rotating when subjected to torsional loads, the brake mechanisms adapted to transfer the torsional loads to the corresponding supporting pylons.

An apparatus (12) for use in a vehicle suspension (10) comprises an anti-roll bar (28) having opposite first and second end portions (30 and 32). An intermediate portion (34) is interposed between the first and second end portions (30 and 32) and is subjected to torsional forces when the first and second end portions (30 and 32) move relative to one another. The apparatus (12) further comprises an actuator (48) for attaching at least one of the first and second end portions (30 and 32) to a part of the vehicle suspension (10). The actuator (48) comprises a cylinder (52) for retaining fluid (54) and a piston assembly (56) for dividing the cylinder into two chambers (81 and 83). The piston assembly (56) is movable axially within the cylinder (52). The piston assembly (56) includes structure forming orifices (144) for interconnecting the two chambers (81 and 83) of the cylinder (52). A fluid flow area of the orifices (144) is adjustable to vary a resistance to relative movement of the first and second end portions (30 and 32) of the anti-roll bar (28).

A fuser for an electrophotographic printer or copier has a fuser roll and pressure roll that form a nip through which a recording paper having a toner image is passed to fuse the toner image thereon. The fuser includes a cleaning web system to clean the fuser roll having a web supply roll, a tension roll to press the web against the fuser roll, and a web take up roll. To prevent spooling of the web from the supply roll during a paper jam clearance while the pressure roll is in contact with the fuser roll, a torsion spring is mounted on the tension roll shaft. The torsion spring provides enough torsional force on the tension roll to prevent rotation thereof during a jam clearance, thus preventing web spooling. During normal operation, the take up roll intermittently overcomes the torsion spring to step the web thereon.

A fixation device is disclosed for the fixation of proximal humerus fractures includes an implantable humerus plate having a proximal portion adapted to be positioned at a head and medial calcar of the humerus, a distal portion adapted to be positioned along a shaft of the humerus, and a plurality of calcar openings provided through the proximal portion adapted to receive calcar fasteners that extend into the medial calcar. The calcar fasteners are grouped into a rafted configuration and the tips of each fastener are positioned into the calcar region so that torsional forces bearing upon the calcar regions are distributed into the rafted fastener support, thereby avoiding varus collapse of the humerus head after fixation of the fracture.

A tolerance compensating assembly of automatically compensating tolerances in the spacing between two structural members comprises a mounting bolt 10, a base element 4, an adjustment sleeve 6 and a driver 8. The base element 4 and the adjustment sleeve 6 form a first thread pairing G1 of a predetermined spiral direction for adjusting the adjustment sleeve 6 relative to the base element 4. The base element 4 and the mounting bolt 10 form a second thread pairing G2 in the opposite spiral direction for clamping the two structural members B1, B2. The driver 8 is a separate structural member and disengageably connected to the adjustment sleeve 6 and has a plurality of flexibly resilient clamping portions 34 spaced along its periphery, which provide for frictional contact with the thread of the mounting bolt 10 above a predetermined torsional force.

A riser assembly includes riser segments, each having threaded ends. A coupling nut is connected to the threaded end of the first riser segment. The threads of a second riser segment and a set of corresponding threads of the coupling nut are breech threads, which allow the second riser segment to stab into the coupling nut and engage the first riser segment. The coupling nut rotates a portion of a turn in order for the breech threads of the second riser segment and the first riser segment to engage each other. Castellations on the first and second riser segments engage each other to transmit torsional forces from one riser segment to the other instead of through the threads.

The invention relates to a rubber lining torsion test device used in rubber lining endurance test, which comprises a pedestal, a torsion shaft disposed on the pedestal and capable of rotating thereon, and a jig for fixing the rubber lining; one end of the torsion shaft is fixedly connected with a swing rod; the other end of the torsion shaft is fixedly connected with a torsion bar which passes through the rubber lining; the swinging of the swing rod drives the torsion bar to rotate to apply a torsional force onto the rubber lining. the rubber lining torsion test device in the invention realizes the multiple output modes needed in test, and achieves the advantages of simple appearance, low manufacturing difficulty, low cost, convenient installation and long service life.

A dental implant has a body and a plurality of distinct roots that extend outwardly from the main portion that generally define a coronal-apical axis. A porous tantalum metal portion is disposed at the body for engaging bone and the plurality of distinct roots are configured to resist a torsional force that is applied to the dental implant and around the coronal-apical axis.

A brake (10) having application for a linear or rotational motion device includes a housing (120) in which a first piston (140), a wedge (142) and a second piston (144) cooperate to engage a friction facing (136) through a plurality of rollers (152, 154, 156, 158). The three part piston assembly (148) allows a braking action and prevents torsional forces that are non-axial to the axis of the first piston (140) and second piston (144). The pistons (140, 144) are biased by compression springs (176) and may be actuated by a fluid.

Hinge having a fixed hinge leaf and a moving hinge leaf, each leaf being provided with at least one pivot bearing and a hinge pivot common to the hinge leafs. The hinge pivot is in the form of a hollow pivot. The hollow pivot is connected non-turnably with the moving hinge leaf and is located turnably in the pivot bearing of the fixed hinge leaf. A torsion spring is located in the hollow pivot, whose torsional force acts in one direction of hinge movement, the hollow pivot and the torsion spring being adapted to be inserted as a single component into the pivot bearings of both hinge leafs. The torsion spring is located in the hollow pivot in a pre-tensioned state so as to constitute a force-actuated connection with an inner wall of the hollow pivot.