121results about How to "Large expansion ratio" patented technology

An intravascular basket device for use in capturing either naturally occurring or foreign debris found in blood vessels or other regions of the body. The basket device is fabricated from a tube and includes a mid-section having at least one ring configured in an alternating V-pattern. The basket device specifically embodies structure that provides enhanced radial opening and angular resistance to collapse.

An intravascular filter device for use in capturing debris which may occur as a result of an intravascular procedure. The filter device includes a proximal section, a distal section and a mid-section. The mid-section includes three rings configured in a sixteen apices alternating V-pattern. The filter device specifically embodies structure that provides enhanced radial opening and angular resistance to collapse in its expanded state. While, in its compressed state the filter device provides an extremely small compressed profile giving it the desired ability to be delivered into very small vessels of the human vasculature.

Expandable medical implants for maintaining support of a body lumen are disclosed. These implants comprise an axially-radially nested, diametrically expandable, moveable vascular device for enlarging an occluded portion of a vessel. The device can be configured to allow for motion such as translating and/or slide and lock. One advantage of the axially-radially nested stent is that it maintains the expanded size, without significant recoil.

A borehole retention assembly for anchoring a well tool within a wellbore including a gripping assembly and an actuation assembly. The gripping assembly includes expandable members such that upon expanding the expandable members, the gripping assembly engages the wall of the borehole. The gripping assembly includes a pair of expandable members and a medial member, the members having cooperating tapered surfaces therebetween such that upon the actuation assembly contracting the gripping assembly, the expandable members are cammed outwardly against the borehole wall. The gripping assembly is mounted on a mandrel enabling them to resist rotational and axial forces on the well tool. When engaged, space is provided on each side of the borehole retention assembly such that annular flow is permitted therearound.

Disclosed is an improved annular well seal elements and method for installing and removing the elements from a subterranean well. The seal element has a plurality of slots formed in the seal element. During radial expansion of the seal element the slots are deformed to reduce hoop stresses in the seal due expansion.

The invention discloses an axial and radial stretching type tire molding drum which comprises an inner tile, an inner tile driving mechanism, an outer tile and an outer tile driving mechanism, wherein two axial ends of the inner tile and the outer tile are respectively provided with a drum shoulder capable of doing stretching motions along the axial direction thereof; the inner tile driving mechanism comprises a hollow spindle, a screw rod, a sliding seat and a connecting rod mechanism, and the connecting rod mechanism is used for realizing the stretching motions of the inner tile along the radial direction and the inner tile shoulder drum along the axial direction; the outer tile driving mechanism consists of two groups of space connecting rod mechanisms which are axially symmetrical relative to the outer tile and is used for realizing the stretching motions of the outer tile along the radial direction and the outer tile shoulder drum along the axial direction; the space connecting rod mechanism is formed by hinging a first group of rod pieces and a second group of rod pieces; the motion planes of the second group of rod pieces are all superposed with the radial symmetrical planeof the outer tile; and the motion planes of the first group of rod pieces are all vertical to the motion planes of the second group of rod pieces. The molding drum can be used for realizing axial andradial stretching, is suitable for molding aviation radial tires and has the characteristics of light weight, compact structure and convenience for tire disassembly.

The invention provides a robot walking mechanism which comprises a mounting part, a driving mechanism and a guide mechanism, wherein the guide mechanism comprises a front guide module and a rear guide module; the front guide module and the rear guide module are same in structure and comprise support rods, guide blocks and guide wheel groups; the guide blocks can be rotatably arranged on the support rods; two ends of the guide bocks are arranged on the guide wheel groups; the bottom ends of the support rods of the front and rear guide modules are respectively arranged at two ends of the mounting parts; and the driving mechanism is arranged on the mounting part in a manner of moving left and right. The guide mechanism and the driving mechanism can adapt to a curve, so that the robot walking mechanism can turn a corner without assistance of an auxiliary device and is simple in structure.

The present invention provides a rubber composition having adequate foamability, uses thereof, a copolymer contained in the rubber composition, a rubber composition capable of providing a cross-linked foam, which has a low specific gravity and an excellent shape-retaining property even when the usage of a nonconjugated polyene is reduced, and a cross-linked rubber and a cross-linked foam, which are produced from the rubber composition. A copolymer (A) according to the present invention is a copolymer including structural units derived from ethylene [A], an α-olefin [B], a nonconjugated polyene [C-1], in which one carbon-carbon double bond (C═C) polymerizable with a metallocene catalyst is present in one molecule, and a nonconjugated polyene [C-2], in which two bonds of C═C polymerizable with the metallocene catalyst are present in one molecule, and being synthesized with the metallocene catalyst, wherein (1) the units derived from the component [B] constitute 10 to 50 percent by mole, (2) the total of the units derived from the component [C-1] and the units derived from the component [C-2] is 1.0 to 6.0 percent by mole, (3) the molar ratio of the units derived from the component [C-1] to the units derived from the component [C-2] is 75/25 to 99.5/0.5, (4) [ML (1+4) 100° C.] is 10 to 200, and (5) 50>activation energy of fluidization (kJ/mol)>35 is satisfied.

The invention relates to a large-stroke leveling lifting mechanism, which is characterized by comprising a loading upper platform, a loading lower platform, lifting driving mechanisms and lifting driving mechanism mounting bases, wherein four lifting driving mechanism mounting bases which are in rectangular distribution are arranged, each of the lifting driving mechanism mounting bases is provided with one lifting driving mechanism, each mounting base comprises at least two mounting base support legs and a middle support frame, the mounting base support legs are fixedly connected to the loading lower platform, the support frames are connected to lifting driving mechanism shells, and the top ends of the lifting driving mechanisms are connected to the upper loading platform by ball hinges. The lifting mechanism is small in size, high in carrying capacity, simple in control manner and suitable for large-stroke lifting of large-mass workpieces.

The invention relates to a zigzag member space telescoping mechanism which comprises a member and a middle bracket and is formed by the series connection of a plurality of layers of same component units. When the mechanism extends or contracts, the members are mutually staggered, which can overcome the interference problem. The arrangement mode of the member and the middle bracket of the mechanism can greatly reduce the occupancy space, which can make the mechanism compact while keeping a large telescopic ratio. When the member length is less than the side length of the middle bracket, the cross section of the mechanism can always remain unchanged. Due to the space symmetry of the mechanism itself, the mechanism has the comparatively uniform distribution of the bearing capacity of the different directions in the space. The mechanism has the advantages of the less material consumption, the large telescopic amplitude, the good stress performance, the strong stability, the wide application range and the simple manufacturing process.

An exposure head includes a substrate through which light from light-emitting elements provided on a first surface of the substrate penetrates from the first surface to a second surface. A rod lens array is provided on the second surface of the substrate to image the light from the second surface. A light transparent member is provided between the substrate and the rod lens array and fixed to the second surface of the substrate and the rod lens array. A support member supports the first surface of the substrate.

A slider-type multi-stage coupling parallel mechanism, which includes a fixed platform, a moving platform, a coupling platform, and three branch chains that are evenly distributed along the circumference and are respectively connected to the fixed platform, the coupling platform, and the moving platform, wherein the connection between the fixed platform and the coupling platform The first active rod in the three branch chains is connected with the fixed platform and one end of the first driven rod, the other end of the first driven rod is connected with the lower surface of the coupling platform, and the first connecting rod is connected with the first driven rod. The middle part is connected with the lower surface of the slide block on the coupling platform; the second active rod in the three branch chains connecting the coupling platform and the moving platform is connected with the upper surface of the coupling platform and one end of the second driven rod, and the second driven rod The other end of the rod is connected with the lower surface of the moving platform, and the second connecting rod is connected with the middle part of the second active rod and the upper surface of the slider. The invention increases the stretching ratio of the single or multi-stage coupled parallel mechanism, increases the working space, reduces the number of drive units, facilitates the control during work, and improves the rigidity of the mechanism.

The invention relates to technological devices for well completion, oil extraction and gas production of oil and gas fields, in particular to a recyclable oil pipe bridge plug tool with a high expansion ratio. The oil pipe bridge plug comprises a first combined laminated spring assembly, a heavy hinged slip assembly, a second combined laminated spring assembly, a first joint-type and link-type anti-outburst mechanism assembly, a second joint-type and link-type anti-outburst mechanism assembly, a lock assembly and a feed-in release assembly; a central pipe is arranged in the middle of the oil pipe bridge plug; the first combined laminated spring assembly, the heavy hinged slip assembly arranged in a circular array mode, the second combined laminated spring assembly, the first joint-type andlink-type anti-outburst mechanism assembly, the second joint-type and link-type anti-outburst mechanism assembly, the lock assembly and the feed-in release assembly are mounted on the central pipe ina sleeved mode. The recyclable oil pipe bridge plug has the advantages that a piston only needs a small stroke through a crank connecting rod mechanism, and the high expansion ratio can be achieved.

A method for combusting fuel in an engine involving decreasing a first volume of a homogeneous lean fuel/air charge to a second volume, in two stages, while increasing the pressure and temperature of that charge (a compression process having a chosen compression ratio), then increasing the pressure at constant volume while adding heat until a predetermined temperature is obtained, increasing the third volume of gas to a fourth volume, in two stages while decreasing the pressure at the predetermined temperature (an expansion process having a chosen expansion ratio much greater than the compression ratio), decreasing the pressure to atmospheric pressure while removing heat under constant volume, and finally decreasing the volume of gas to the first volume while removing heat under constant pressure to complete an over expanded, cycle. Also disclosed is an engine employing said over expanded, two-stroke HCCI cycle.