1529 results about "Frictional resistance" patented technology

The devices and methods described herein relate to improved structures for removing obstructions from body lumens. Such devices have applicability in through-out the body, including clearing of blockages within the vasculature, by addressing the frictional resistance on the obstruction prior to attempting to translate and/or mobilize the obstruction within the body lumen

The devices and methods described herein relate to jointless construction of complex structures. Such devices have applicability in through-out the body, including clearing of blockages within body lumens, such as the vasculature, by addressing the frictional resistance on the obstruction prior to attempting to translate and/or mobilize the obstruction within the body lumen

The devices and methods described herein relate to jointless construction of complex structures. Such devices have applicability in through-out the body, including clearing of blockages within body lumens, such as the vasculature, by addressing the frictional resistance on the obstruction prior to attempting to translate and/or mobilize the obstruction within the body lumen

A clipping instrument for an endoscope is provided. The clipping instrument includes a flexible sheath, an operation wire, which can be forwarded and retracted in an axial direction of the flexible sheath, at least one detachable clip assembly, including a pair of openable and closable clipping arms which can be projected forward to open outside the flexible sheath and to be closed to clip onto a treatment object outside the flexible sheath according to forwarding and retracting movements of the operation wire, and frictional members, which can generate frictional resistance between each other inside the flexible sheath. The frictional resistance is generated while the clipping arms of the clip assembly are forwarded by the forwarding movement of the operation wire to project out of the flexible sheath to be fully opened.

The devices and methods described herein relate to clearing of blockages within body lumens, such as the vasculature, by addressing the frictional resistance on the obstruction prior to attempting to translate and/or mobilize the obstruction within the body lumen.

The devices and methods described herein relate to improved structures for removing obstructions from body lumens. Such devices have applicability in through-out the body, including clearing of blockages within the vasculature, by addressing the frictional resistance on the obstruction prior to attempting to translate and/or mobilize the obstruction within the body lumen

A cryogenic distillation tower is provided for the separation of a fluid stream containing at least methane and carbon dioxide. The cryogenic distillation tower has a lower stripping section, an upper rectification section, and an intermediate spray section. The intermediate spray section includes a plurality of spray nozzles that inject a liquid freeze zone stream. The nozzles are configured such that substantial liquid coverage is provided across the inner diameter of the intermediate spray section. The liquid freeze zone stream generally includes methane at a temperature and pressure whereby both solid carbon dioxide particles and a methane-enriched vapor stream are formed. The tower may further include one or more baffles below the nozzles to create frictional resistance to the gravitational flow of the liquid freeze zone stream. This aids in the breakout and recovery of methane gas. Additional internal components are provided to improve heat transfer and to facilitate the breakout of methane gas.

An interior rearview mirror assembly for vehicles incorporates a rearview mirror mount, a rearview mirror, and a rearview mirror support. The support is pivotally attached to the mirror mount by a first pivot element, and to the rearview mirror by a second pivot element. The mirror mount, support, a rearview mirror housing, and the pivot elements are each formed by molding from polymeric material having a respective color. In various embodiments, the colors may all be substantially the same, such as black, gray, tan, brown, burgundy, green, or another color, or may be different. In one form, the rearview mirror housing includes at least one electrical accessory. Electrical conductors may extend through the pivot elements and mirror support to the rearview mirror housing to provide an electrical connection for the electrical accessory to the vehicle electrical system. The pivot elements preferably include ball pivot members and sockets on various of the mirror mount, support and rearview mirror housing, and may include surfaces for enhanced frictional resistance to pivotal movement. In one form, the rearview mirror mount preferably includes receiving members which release the assembly from a windshield attachment member when sufficient force is applied such as upon impact.

A positionable support device includes a friction cylinder as a counterbalance in place of conventional gas springs. The support device includes a support arm pivotally secured between two endcaps to allow for vertical movement, the first endcap being mounted to a support structure such as a wall or desktop, the second endcap adapted to engage a mounting element for a device such as an electronic device. A friction cylinder is pivotally attached at one end to the first endcap, and at the other to an outward portion of the support arm. The friction cylinder includes a tubular member open at one end for receiving a friction bushing and a shaft. The friction bushing is secured to the tubular member and has a central passage which allows the shaft to slide through the friction bushing, extending and retracting in relation to the tubular member. The friction bushing is adjusted to apply frictional resistance to movement of the shaft sufficient to support the weight of the support device and the electronic device, thereby allowing the device to be adjusted to a desired vertical position.

A high-frequency treatment tool for an endoscope, having an electrically insulating flexible tube, an operating wire, a high-frequency electrode, which is provided at a distal end of the operating wire and configured to be protrusible and retractable from a distal end of the flexible tube in the axial direction of the flexible tube, and a tubular member, is provided. The tubular member is fitted on the operation wire and immovably attached thereon by plastic deformation, which is caused as at least a part of the tubular member is deformed to interfere with an inner circumferential surface of the flexible tube so that the operating wire is halted with respect to the flexible tube at an arbitrary position in the flexible tube by frictional resistance caused between an interfering part of the tubular member and the inner circumferential surface of the flexible tube.

An apparatus and method for damping vibration, especially torsional vibration due to stick-slip, in a drill string, Sensors measure the instantaneous angular velocity of the drill string at one or more locations along the length of the drill string. One or more vibration damping modules are also spaced along the length of the drill string. When torsional vibration above a threshold is detected, the damping module imposes a reverse torque on the drill that dampens the torsional vibration. The reverse torque can be created by imparting a frictional resistance to the rotation of the drill string. The frictional resistance can be created externally, by extending friction pads from the damping module so that they contact the bore hole wall and drag along the bore hole as the drill string rotates, or internally by anchoring a housing mounted on the drill string to the wall of the bore hole and then imposing frictional resistance on a fluid, such as a magnetorheological fluid, flowing within the drill string.

The present invention relates to a ceramic sheet having uniform quality over its entire surface with a decreased number of defects such as foreign matters and flaws. When the ceramic sheet was divided into sections of 30 mm square or smaller, each divided section has 5 or less defects detected based on an image obtained with a charge coupled device (CCD) camera. The present invention also relates to a method of producing the ceramic sheet. In this method, a green sheet or a calcined sheet mainly including spherical ceramic particles having an average particle diameter of 0.1 to less than 5 μm was used as a spacer. By using this spacer, the green sheet for ceramic sheet slides smoothly on the spacer surface when it shrinks in baking, and the friction resistance between the green sheet for ceramic sheet and the spacer is lowered. In this manner, the method of the present invention can mass-produce the above-described high quality ceramic sheets.

The invention belongs to the technical field of materials and in particular relates to a graphene coating as well as a preparation method and a coating method thereof. The graphene coating is prepared from the components by weight: 5-95wt percent of less layer of grapheme, 5-95wt percent of adhesive, 0.01-50wt percent of dispersant and surfactant, 0.01-10wt percent of defoamer and the balance of solvent. With the adoption of the graphene coating, the thickness of an electricity and heat conductive coating can be controlled to be 100nm-20 microns; when the graphene coating is used on a plastic matrix, the volume resistivity can reach a range from 10<-2>ohm.cm to 10<-4>ohm.cm; while the graphene coating is used on a metal matrix, the volume resistivity can reach 10<-6>ohm.cm. The graphene coating can be applied to the metal surface so as to improve the cohesiveness, the electricity/heat conduction performance and the corrosion and oxidation resistance. When the graphene coating is coated on the plastic surface, the frictional resistance, the electricity and heat conduction performances and the static resistance can be lowered, and the graphene coating can be applied to the fields of printed circuits, electronic devices, radio frequency devices, touch screens, thin film solar energy, LEDs, magnetic shielding, radio frequency shielding and the like.

A large scale hydraulically driven downhole reciprocating tractor to display substantially continuous advancement. The tractor may be configured to pull coiled tubing downhole in a continuous manner so as to substantially avoid static frictional resistance to the pulling. As a result, the tractor and coiled tubing may achieve up to about twice the depth into the well otherwise attainable. Additionally, the tractor may include a fail safe mechanism whereby a plurality of pilot operated valves are employed to ensure that immobilization of at least one anchor of the tractor is present at all times during downhole advancement to thereby avoid the undesired effects of coiled tubing spring-back.

A spherical inner surface 5 of the outer race 1 and track grooves in the outer race 1 are each defined by a post-hardening cut surface. A spherical outer surface 6 of the inner race 2 and track grooves in the inner race 2 are also each defined by a post-hardening cut surface. A retainer 4 has a spherical outer surface 10, a spherical inner surface 11 and inner surfaces of the pockets 9, all of which are defined by a post-hardening cut surface. Respective surfaces of the retainer 4, the outer race 1 and the inner race 2 which contact with each other are formed with a surface treatment layer for reducing a frictional resistance.

A steering wheel and column assembly is provided for deployment on a vehicle. In one embodiment, the steering wheel and column assemblies comprises: (i) a steering column housing, (ii) a rotatable steering assembly, and (iii) a torsional damper device. The rotatable steering assembly includes a steering column shaft, which is rotatably coupled to the steering column housing, and a steering wheel, which is fixedly coupled to the steering column shaft. The torsional damper device includes a stator body, which is fixedly coupled to the steering column housing, and a rotor body, which is fixedly coupled to the rotatable steering assembly. The rotor body frictionally engages the stator body to produce a predetermined coulomb torque frictional resistance.

The invention provides a supersonic condensation and cyclone separation device, which leads air flow to generate powerful rotation in a blade-guiding manner at an entrance; then, a laval nozzle is used for coordinating with the separation device to lead the air flow to reach a supersonic speed and reduce temperature thereof greatly, thus condensing components with higher dew points and achieving the separation between the gas phase and the liquid phase under the action of the centrifugal force generated by the rotation of the air flow; and a highly-efficient liquid trap and a cyclone-recovering booster are arranged at the tail part of the nozzle. Compared with the existing supersonic separating device, the supersonic separation device of the invention has higher efficiency of separation and cyclone recovery under the same working conditions of low flow rate, for the device has the advantages that the flow channel of the device in a high-speed flow field area is smooth, the fractional resistance of the wall surface is low and the device is provided with the cyclone recovering booster suitable for the conditions of low flow rate. Since quite a lot of inland gas fields has low single-well flow rate in China, the device of the invention has wide application prospect in the field of natural gas treatment for the inland gas fields in China.

Provided is an electric brake capable of accurately estimating the brake pad temperature and securing a sufficient braking force and response. An electric brake has a disc rotor rotating with a wheel, an actuator for rectilinearly actuating a piston in the axial direction of the disc rotor by using an electric motor, a drive controller for controlling the drive of the actuator, a brake pad pressed by the piston to give a frictional resistance to the disc rotor in the direction of rotation, and a braking start position detector for detecting a braking start position of the piston where the disc rotor is brought into contact with the brake pad. The drive controller stores the braking start position detected by the braking start position detector as the maximum braking start position. When the braking start position shifts in the pressing force-increasing direction, the drive controller updates the value stored as the maximum braking-start position.

The invention relates to a device for reducing guiding zone friction in high pressure formation of tubular material. It comprises dies, left punch head, right punch head, right round body on the right end face of the left punch head with right guiding ring slot, so does the right punch head, with gaps between the die, left punch head and the right punch head. It can eliminate the high touch pressure zone of the tubular end and the die guiding zone inner wall, reducing the friction resistance to improve production efficiency and die durability, and lowered requirement for tonnage.

Apparatus for exercising the forearm muscles responsible for movement of the hand at the wrist. The apparatus comprises two rigid rings adjoined by, and allowed to rotate about, the axis of a central, cylindrical variable resistance mechanism. The rigid rings each support a handgrip that is allowed to rotate about the inner circumference of each ring at variable resistance settings set with a peripheral resistance mechanism including an externally threaded terminal end of each handgrip, a knurled sleeve with internal threads at one end and external threads at the other. The knurled sleeve can be rotated about the axis of each handgrip, through internal threads of the inner ring, into the inner surface of the outer ring thereby creating a desired frictional resistance. The desired resistance can be preset and returned to through the incorporation of click-stops.

The present invention provides a drill comprising: a drill main body rotatable about an axis of rotation, and having a tip end with a tip flank and a shank; a chip discharge flute formed on a periphery of the drill main body, and extending from the tip end toward the shank of the drill main body; and a cutting edge formed along an intersecting ridge where a wall surface of the chip discharge flute facing in the direction of drill rotation intersects the tip flank of the drill main body, wherein the cutting edge comprises a convex cutting edge toward the periphery and a concave cutting edge smoothly extending from the convex cutting edge. When drilling work is performed with this drill, the chips are generally curled and can be smoothly discharged without being excessively abutted against the wall surface of the chip discharge flute; consequently, the chips can be smoothly discharged, and the drill main body is subjected to less frictional resistance, which leads to less wear on the drill and less driving torque for drilling. Therefore, the drill life can be preferably extended even under severe drilling conditions, such as during high speed drilling, and smooth and stable drilling can be performed.

A multi-direction forging technique and die for a 7A04 aluminum alloy cartridge receiver body part belongs to the technical field of metal material plastic forming and aims at effectively overcoming the problems of the existing opening-die forging technique and isothermal-die forging technique. The order of the multi-direction forging technique of the invention includes the steps of baiting, heating, rough making, reheating and multi-direction forging. The multi-direction forging relates to (1) using a multi-direction die forging die to pre-forge and form a heated 7A04 aluminum alloy roll forging rough;(2) then suing the multi-direction die forging die to realize finally forge to forge a die forging element. The invention multi-direction forging die includes symmetrical upper half and lower half concave model, a pre-forging convex model, a final-forging convex model, a fixing plate for the pre-forging convex model, a fixing plate for the final-forging convex model and a model frame consisting of an upper model seat and a lower model seat. The invention has the advantages of reasonable technique flow, stable technique parameter and performance, simple structure of the die, convenient manufacture, mounting and use, reliable work. And the invention can greatly reduce the friction resistance between a forging element and a die chamber, improve the surface quality of the forging element and remarkably improve the service life of the die.

A ring gear (50) is provided between a pair of differential case halves (18, 18') integrally formed with teeth defining a pair of side gears (19, 19') that engage differential pinion gears (12, 12') mounted on a pinion shaft (17) to provide a motor vehicle differential gear assembly (100) having reduced components while enabling a limited slip capability controlled by regulating frictional resistance at a thrust surface interface.

To provide a piston for an internal combustion engine including a skirt which causes a relatively small frictional resistance and can maintain a favorable frictional property over an extended period of time. In a piston for an internal combustion engine having a skirt 4 on whose sliding surface a resin coating layer is deposited, the skirt 4 comprises a thin walled portion 51 located in a circumferentially middle part thereof and a pair of thick walled portions 52 provided on either lateral side of the thin walled portion 51. The resin coating layer 44 at least in the part thereof deposited on the thick walled portions 52 is formed with a plurality of dimples 45. The skirt may comprise a skirt main body 41 extending axially at a fixed distance from the central axial line of the piston in an axially middle part thereof, and a first reduced diameter portion 42 depending from the lower end of the skirt main body and having a progressively smaller diameter toward a lower end thereof. The dimples 45 may be arranged along a first boundary 6 between the skirt main body and first reduced diameter portion.

The invention provides an aluminum alloy plate type component frozen forming method. In the method, by means of the characteristic that plasticity of an aluminum alloy plate is improved under ultralowtemperature, an aluminum alloy plate material 3 is cooled to the ultralow temperature range below 123 K through a cooling agent 1, and a die 2 is adopted for forming a complex thin-wall component. Compared with the prior art, the method has the beneficial effects that the method is executed under ultralow temperature condition, the plasticity of the aluminum alloy material is improved, the problem that plate type components in complex shapes are cracked when formed is solved, the forming limit is remarkably improved, the internal structure of aluminum alloy is not changed, structure propertydamage is not produced, frozen lubricating layers are formed on the working surfaces of the aluminum alloy plate and a die, and plate flow friction resistance can be reduced; and meanwhile, the low-temperature cooling agent is environmentally friendly, and the tonnage and manufacturing cost of equipment can be greatly reduced compared with hot forming and hydrodynamic deep drawing forming.

The invention relates to industrial automation equipment, in particular to an automated manipulator. A four-degree-of-freedom servo manipulator comprises a lifting arm, a rotary arm, a telescopic boom, a torsional arm, a base and a gripper, wherein the lifting arm is fixedly connected to the base, and fixed on the ground; the gripper is fixedly connected to the output end of the torsional arm; the fixing plate of the telescopic boom is fixedly connected to a rotary cover plate; one end of the telescopic boom is fixedly connected to a vertical flange plate, and the torsional arm is fixedly connected to the vertical flange plate. The four-degree-of-freedom servo manipulator provided by the invention is applicable to machine manufacturing processes and achieves material transportation and transmission, the frictional resistance is small, the running is stable, the accuracy is high, the service life is long, the four-degree-of-freedom servo manipulator provided by the invention can be used for picking up workpieces, through the compact structure distribution of the four-degree-of-freedom servo manipulator, the external dimension can be effectively controlled, and a maximal running space can be obtained.

The invention discloses an indoor simulation experiment system for pipe-jacking grouting drag reduction, which comprises an experiment box. An opening and a vertical loading test system are arranged on the experiment box; obround holes are arranged on two opposite sides of the experiment box; a horizontal loading test system is arranged on the one side of the experiment box; the experiment box is internally filled with a soil sample; a pipe to be tested penetrates through the experiment box via the obround holes on the two sides of the experiment box. The experiment system also comprises a grouting system and a grouting pipe connected with the grounding system; the pipe to be tested is formed by a front pipe segment and a rear pipe segment that are connected with each other; and the diameter of the front pipe segment is larger than that of the rear pipe segment; at least one grouting hole is configured on the wall of the pipe to be tested; and a slurry outlet end of the grouting pipe extends in the pipe to be tested and is connected with the grouting holes. According to the invention, the experiment test can simulate pipe-jacking process in soil layers; mixed slurry is injected to surrounding soil during the jacking process to test frictional resistance and frictional coefficient during the pipe-jacking process under different slurry proportions and different grouting pressures, so that the grouting pressure and the grouting proportion suitable for pipe-jacking in the soil layers can be obtained comprehensively and accurately.

The invention relates to the technical field of conveying belts and discloses a chain conveying mechanism. The chain conveying mechanism comprises a conveying belt support. Rotating shafts are arranged at the two ends of the conveying belt support respectively. Chain wheels are arranged at the two ends of each rotating shaft. Chains are arranged around the corresponding chain wheels at the two ends of the conveying belt support. A supporting frame is arranged between the two rotating shafts and is connected with the rotating shafts in a rotating mode. Two rows of supporting wheels are arranged on the upper side of the supporting frame, and two rows of tensioning wheels are arranged on the lower side of the supporting frame. The supporting wheels and the tensioning wheels are meshed with the chains. The chains are formed by hinging chain bodies in a series-wound mode. A plurality of parallel connecting rods are arranged between the two chains. The chain wheels rotate so as to drive the chains to move. Articles are placed on the connecting rods, the frictional resistance is small when the chains move, and therefore the load of a motor can be reduced, the service life of the motor can be prolonged, the chains are insusceptible to abrasion, and the service life can be long.

A control valve of high-pressure pneuamtic valve is composed of main valve and magnetic pilot valve which is an electromagnetic high-pressure ball valve. Said main valve consists of valve cover, conic valve core, valve bush and main body. The sealing surface of conic valve core is made of vulcanized rubber. The PTFE is used for the seal between conic valve and valve bush. Its advantages are simple and compact structure, reliable sealing, and high flow controlled by electronic signals.

A lubricant applying unit, included in a process cartridge provided in an image forming apparatus, includes a solid lubricant, a lubricant supporting unit to support the solid lubricant, a lubricant holder to accommodate the solid lubricant supported by the lubricant supporting unit, a pressing mechanism located between the lubricant supporting unit and the lubricant holder and designed to press the solid lubricant against a lubricant applying member, and a frictional resistance reducing member to reduce a frictional resistance produced at sliding contact portions between the lubricant supporting unit and internal surfaces of the lubricant holder.