135results about How to "Increase the friction surface" patented technology

Devices for repairing and replacing a heart valve in various embodiments, the devices include at least first and second support rings connected together in a coiled configuration to abut opposite sides of a valve annulus. A replacement valve may be secured to the coil-shaped device. Various alternative fastening systems include suture fastening systems, mechanical fastening systems, shape memory alloy fastening systems and other fastening systems relying only on the resilience between adjacent coils. A method generally includes inserting a first end of the coil-shaped member through a valve annulus, rotating a first ring of the coil-shaped member into position on one side of the valve annulus and positioning at least a second ring of the coil-shaped member on an opposite side of the valve annulus.

The arched multi-segmented ramp assembly of the present invention has the advantageous qualities of being portable, lightweight, easily deployable and storable. Identical step links have keystone-shaped sides that abut adjacent members and are joined one to the other by knuckle-like hinges, both of which structural features impart to the unrolled assembly a gently arcuate contour, thereby enhancing the ramp's strength to weight characteristics compared to ramps of the prior art. The hinge connections further permit the ramp to be rolled up for easy transport and storage. Because of its modular design, the arched ramp may be assembled using varying numbers of component step-links, thus providing a user with the flexibility to form a ramp assembly with lengths suitable for different particular applications.

The invention discloses a magnetic liquid damping device, relates to a damping device and aims to solving the damping problem of a longer object in a spacecraft. The device consists of a non-magnetic conducting shell (2), magnetic liquid (3), a permanent magnet (4), a nut (5), an end cover (6), a bolt (7), a screw (9), a sealing gasket (10) and an O-shaped seal ring (11), wherein the parts are connected together; the permanent magnet (4) is arranged in the cavity of the non-magnetic conducting shell (2); the end cover (6) with the O-shaped seal ring (11) is fixed on one end of the non-magnetic conducting shell (2) through the bolt (7) and the nut (5); the magnetic liquid (3) is filled in the cavity of the non-magnetic conducting shell (2) through a screwed hole (8); the screw (9) and the sealing gasket (10) are used for sealing; the permanent magnet (4) is a cylinder; and 4-8 through holes are distributed in the cylinder axially. The device disclosed by the invention has good damping effect.

A device for use with a bed having a frame and a supporting surface includes a flexible sheet with a tether strap connected to the sheet and extending from the sheet. The flexible sheet has opposed top and bottom surfaces, with the top surface having a high friction material with a higher coefficient of friction as compared to the bottom surface, which includes a low friction material. The tether strap is configured for connection to the frame of the bed to secure the sheet in place. A system incorporating the flexible sheet may also include an absorbent pad configured to be placed on the top surface of the sheet, where the high-friction top surface resists sliding of the absorbent pad, as well as one or more wedges having a base wall that the wedge rests on and a ramp surface configured to confront the sheet when the wedge is placed under the sheet. The base wall and the ramp surface may also contain high friction and low friction materials, respectively.

The invention relates to a method for producing powder smelt screw ratchet, which comprises: mixing the materials, compressing molding, sintering, compressing and shaping, to obtain the ratchet. The invention also discloses a relative mould, which is formed by a compressing upper punch, compressing middle mould, compressing lower punch; the upper part of lower punch has the inner screw tooth matched with the outer screw tooth; the upper punch is sliding matched with the middle mould; the middle mould is sliding matched with the lower mould; the compressing core rod has compressing core rod, friction plate, and rotation element; the upper part of compressing core rod has outer screw tooth; the lower end of core rod and the upper end of rotating element have friction plate between them, while their contact surface has lubricant. The invention, via the rotation of core rod, realizes the one-time molding and demoulding of inner screw ratchet, to improve the yield and reduce the cost.

The retractable foot gear 10 includes a sole 12 and a retractable wheel, ball, blade, or similar low friction element 16 which normally projects from a recess formed into the shoe's sole 12. The low friction element 16 retracts into a recess 14 when a predetermined amount of force is exerted on the low friction element 16. The low friction element 16 is additionally biased so as to automatically return to an extended position when the predetermined force is relieved. The retractable foot gear 10 assists persons with difficulty in walking, standing, or maneuvering. Moreover, the protruding low friction element enables one to slide one foot along a walking surface while minimizing the tendency of one to slip and fall.

A method of manufacturing a sports ball includes the steps of: providing a ball body having a valve stem formed thereat; providing a plurality of cover panels; integrally forming a plurality of sculptural bumps on at least a portion of one of the cover panels to form a sculptural ball surface of the cover panel; and overlapping the cover panels on said ball body to form a ball carcass in a stitch-less manner. Accordingly, the sculptural bumps are raised above an outer panel surface of the cover panel without applying a depression force to indent on the outer panel surface of the cover panel. The cover panels are interlocked and bonded with each other edge-to-edge to enclose the ball body inside the ball carcass.

Element with variable stiffness controlled by negative pressure, the element including a gas-tight envelope, a plurality of flexible layers in the envelope, each layer having a first surface and a second surface, and, a valve adapted to evacuate the interior of the envelope, where the first and second surfaces of two adjacent layers have a friction coefficient between each other which is higher than 0.5, the first and second surfaces of two adjacent layers have adhesion properties, such that a normal force per unit area of below 0.07 N / mm2 is required to separate them and / or the energy per unit area required to separate them in normal direction is below 6.7 J / m2.

The present invention provides a lock-up clutch mechanism for a torque converter, comprising a lock-up clutch to which a friction material having a friction surface is secured and a front cover having an engagement surface with which the friction surface is engaged when the friction surface is urged in an axial direction and in which the friction surface of the friction material has a configuration including a protruded area protruding in the axial direction.

The present invention relates to a tensioner (1) for an endless drive, in particular of an internal combustion engine, wherein the tensioner has a base part (2) and a clamping part (3) which can rotate relative to the former, a spring element (11) which is arranged between the base part and the clamping part (3) so as to impart a force, and a friction apparatus (12) which is provided between the spring element (11) and the base part or the clamping part (3) and by way of which the relative movement between the base part (2) and the clamping part (3) is damped. In order to improve a tensioner of the generic type in such a way that a simple construction is possible with satisfactory damping, it is proposed to arrange the friction apparatus (13) radially outside the spring element (11).

The present invention discloses a spiral disc type friction transmission self-adaption automatic speed change drive assembly for an electric motor car. The spiral disc type friction transmission self-adaption automatic speed change drive assembly comprises a box body, a transmission shaft, a slow gear transmission mechanism, and a mechanical intelligent self-adaption speed change assembly by utilization of disc type friction transmission; and the slow gear transmission mechanism comprises an overrunning clutch, an inner ring of the overrunning clutch sleeves a transmission shaft sleeve, and an inner circle of the inner ring is provided with a spiral cam used for being cooperated with the transmission shaft sleeve. The spiral cam output structure is adopted by the inner ring of the overrunning clutch, the spiral cam is disposed on the transmission shaft sleeve, use of end cams is reduced, and the spiral cam has good flexibility and is sensitive to resistance. The overrunning clutch has the possibility of multiple cam transmission, sensibility and stability of disengaging and engaging of friction transmission are ensured by utilization of the disc type friction transmission, axial dimension of a speed changer is reduced, and the spiral disc type friction transmission self-adaption automatic speed change drive assembly is suitable for hubs and has relatively good flexibility and high transmission precision during the speed change process.

The invention discloses a pneumatic floating-supporting device, which comprises a supporting sleeve, wherein the supporting sleeve is installed on workpiece equipment, and a locking cylinder is arranged beside the supporting sleeve; a floating-supporting column which is aligned with a thin-wall part-supporting part is arranged in the supporting sleeve, and the lower end of the floating-supporting column is provided with a spring; and the lateral surface of the supporting sleeve is provided with a pin hole, a locking pin which can be tightly abutted against the floating-supporting column is inserted into the pin hole in a penetrating way, and the locking pin and an output shaft of the locking cylinder are oppositely arranged. The pneumatic floating-supporting device has a simple structure and can be used for providing supporting for other parts except for barrel-shaped thin-wall parts to prevent the thin-wall parts from being deformed in processing.

A hitch step assembly comprises a first shot component injection molded from a first polymer compound with a high flexural modulus and a second shot component injection molded from a second polymer compound having a relatively low Shore D hardness but high elastic compression. A post and a step body core are molded from the first polymer compound. A shell of the step body is molded from the second polymer compound and is overmolded on the step body core. The shell forms a compression zone that provides some protection against rear impacts. The hitch step assembly exhibits satisfactory resistance to torsion around the hitch receiver axis and deflection, even when a width of the step body exceeds 10.7 inches and the weight of a large man is placed on the top surface of the hitch step near its end.

The invention discloses a post-tensioned pre-stressed compound uplift pile, which comprises a cement mixing pile, wherein a reinforced concrete cylindrical core in the cement mixing pile is arranged on a cushion cap surface at the upper end of the pile. The post-tensioned pre-stressed compound uplift pile is characterized in that: a post-tensioned pre-stressed steel strand cable is arranged coaxially in the cylindrical core, and is provided with at least one extension head; the steel strand cable is arranged around the periphery of the cylindrical core; the steel strand cable is fixed through a connecting piece after tensioning; and the steel strand cable and the connecting piece thereof are positioned in the cushion cap surface. The post-tensioned pre-stressed compound uplift pile has the advantages that: the compound uplift advantages of the cement mixing pile and reinforced concrete are brought into full play, a larger friction surface is formed, a required concrete pile has a small pile body, and the economic benefit is remarkable.

The invention discloses a waved friction-driven side-hung self-adaptive automatic variable-speed driving assembly for an electric motorcycle. The waved friction-driven side-hung self-adaptive automatic variable-speed driving assembly comprises a box body, a transmission shaft, a slow-gear transmission mechanism and a mechanical intelligent self-adaptive variable-speed assembly; the box body is provided with a mounting part used for being mounted on the hub side in a side-hung manner; and the friction surface of a driving friction disc and the friction surface of a driven friction disc of the mechanical intelligent self-adaptive variable-speed assembly adopt waved friction surfaces to form a friction drive pair. According to the waved friction-driven side-hung self-adaptive automatic variable-speed driving assembly, the friction discs are adopted to form a separable and combinable structure to achieve the advantage of sensitive response, and the axial size is relatively small; meanwhile, as the structure that a ring-shaped bulge and a ring-shaped groove of the friction surfaces with the waved radial sections are mutually in embedded connection with each other is adopted, engagement of the friction surfaces is dispersed, the coaxiality of the driving friction disc and the driven friction disc is favorably guaranteed, the friction surfaces are favorably increased, and favorable transmission is ensured under the condition of limited elastic force; and the separation and combination sensitiveness is favorably guaranteed, the transmission precision is improved, and the waved friction-driven side-hung self-adaptive automatic variable-speed driving assembly is suitable for the field of electric motorcycles.

The invention discloses an anti-loosening bracket joint device with multiple friction plates. The anti-loosening bracket joint device comprises a rotary base, an adapter crankshaft, an adapter block, a locking bolt, a locking cover, a first friction plate, a rotary shaft, a second friction plate (number of friction plates can be increased), a rotary head rotation block and a hanging plate assembly, wherein the rotary base is fixedly arranged on parts such as a desktop and a wall through connection or other joints; the adapter crankshaft, the rotary base and the adapter block form a rotary pair; the locking cover is blocked with the rotary head rotation block through the locking bolt; the rotary shaft penetrates through the center of the first friction plate, the center of the second friction plate and the center of a square hole bearing, and is positioned in a cavity which is formed by fixedly connecting the locking cover and the rotary head rotation block; and the rotary head rotation block is connected with the hanging plate assembly through a blocking pin. According to the anti-loosening bracket joint device disclosed by the invention, multiple friction plates are adopted, so that friction surfaces and axial pressing are increased, and therefore, greater friction force can be obtained. The anti-loosening bracket joint device is reasonable in design, is simple in structure, and is suitable for the optimized design of the anti-loosening bracket joint device.

A singulator conveyor system having conveyors arranged in adjacent parallel configuration for separating and orienting side-by-side packages having unequal loading, different sized packages (e.g., boxes, flats and softpacks), partially filled bags, long and slender articles, and packages having an offset center of gravity. Two of more small items abreast of one another are separated while permitting large items to pass thorough the singulator even when the item is a large bag of small items. A first conveyor lane includes a high friction surface for conveying articles forward along a vertical side wall. A second conveyor adjacent thereto has a low friction surface including both forward and lateral conveying forces urging parcels forward and away from the first conveyor and side wall toward a third conveyor having a high friction conveying surface wherein the longitudinal edge of the second conveyor is below the first conveyor and above the third conveyor.

The invention relates to an aclinal stirring friction welding method for an AZ31 magnesium alloy sheet and a stirring head; the method comprises the following steps of: firstly, mechanically polishinga butt jiont face to be welded of the AZ31 magnesium alloy, cleaning by acetone, absolute ethanol and deionized water successively, and then fixing the AZ31 magnesium alloy on the base plate of a stirring friction welding machine after being quickly dried; conducing a single pass aclinal stirring friction welding treatment to the butt joint face to be welded of the AZ31 magnesium alloy by the aclinal stirring friction welding stirring head, wherein the stirring head comprises a cylindrical clamping part, a round table shaft shoulder and round table stirring needle; the stirring head shaft shoulder is concave design, and three spiral grooves are uniformly distributed on the surface of the round table. The welding method and stirring head provided by the invention solve the problem that themechanical property of the welding joint is reduced due to the thinned weld seam when the magnesium alloy sheet is welded by the inclined stirring friction and the problem that the traditional welding method is easy to form pores, cracks and deformations in a weld zone. The welding joint obtained by the invention has beautiful appearance, and the maximum tensile strength of the joint can reach 97.8% of a base metal.

The invention provides a long range bullet. The bearing surface of the body of the bullet is provided with one or more annular narrows of which the combined length is at least one third of the length of the bearing surface of the bullet and which depth is between 0.005 mm up to half of the groove depth of a barrel in which the bullet is intended to shoot.

The invention relates to a damping-variable friction damper capable of preventing lateral buckling. The damping-variable friction damper comprises a friction plate with clamping slots, a friction plate with an arc surface, a bottom friction plate , precompressed bolts and a pressure converter; the friction plate with the arc surface, the friction plate with the clamping slots and the bottom friction plate are connected through four precompressed bolts; the friction plate with the arc surface is positioned on the upper part, wherein the arc surface is downward; the friction plate with the clamping slots is positioned in the middle; U-shaped wings on both sides of the friction plate with the clamping slots and the arc surface of the friction plate with the arc surface constitute a middle sealed space; the pressure converter is arranged in the sealed space, is fixed on the friction plate with the clamping slots and moves together with the friction plate with the clamping slots; the bottom friction plate is positioned on the lower part; at least two friction surfaces are formed by means of the three friction plates; the precompressed bolts penetrate through the two clamping slots of the friction plate with the clamping slots, so that the friction plate with the clamping slots can freely slide between the friction plate with the arc surface and the bottom friction plate. According to the damping-variable friction damper disclosed by the invention, the pressure converter is additionally arranged in the friction damper, and the effect of varying the friction damping by means of the vertical pressure of a spring is achieved.