164 results about "Rigid block" patented technology

A bezel and bezel assembly in which the bezel is a rigid block with a plurality of cavities. A depression in the block has ribs extending up therefrom to form an elevated contour. The depression includes at least one cavity therein for the application of air pressure into the depression and over the elevated contour. A gasket fits over the bezel so that positive pressure applied through the at least one cavity in the depression forces a gasket membrane to expand away from the pumping side and negative pressure applied through the at least one cavity in the depression pulls the gasket membrane against the elevated contour of the ribs. The bezel may include solvent bondable tubing connections for making pneumatic connections to the bezel.

A surgical instrument for treating body tissues through narrow body passages employs an elongated cantilevered beam having a proximal end supported in a rigid block and a narrower distal end extendable through the narrow passages. One or more piezoelectric actuators are fixed to the beam surface and energized from an AC source through electrodes interspersed with the piezoelectric actuators to produce oscillatory motion of the beam distal end in multiple modes of movement with sensing electronics to monitor and control the distal mechanical movement. The oscillatory beam is assisted with cold plasma sterilization of the target tissue surface to be treated at the distal end.

An adapter for mounting an accessory on a shroud such as is found on an M2 machine gun includes a rigid block embracing the shroud. Blunt-nosed helically threaded plugs penetrate the block and intrude partly into perforations of the shroud. Retaining rings, threaded oppositely to the threaded plugs, prevent the plugs from backing out. A key tool is provided to tighten the plugs and retaining rings. A longitudinally oriented T-rail projects radially from the block. A slide body engages the T-rail and includes a locking mechanism, a lamp assembly, a logically switched power control, a power cable, and a control cable with interchangeable switches.

The rail track tie including: a rigid block presenting a bottom face, and a top face for receiving at least one longitudinal rail; a cover for receiving the rigid block and in the form of a rigid shell including a bottom and a peripheral rim around the bottom; and a resilient soleplate disposed between the bottom face of the rigid block and the bottom of the cover. The resilient soleplate has dynamic stiffness k2 lying in the range of 6 kN/mm to 10 kN/mm, and preferably in the range of 6 kN/mm to 8 kN/mm.

The invention relates to a lower-bound limit analysis method of bearing capacity considering rock translation and rotation effects at the same time, and belongs to the technical field of rock slope stability analysis. According to the method, a rigid block unit is scattered as a geometry system of a rigid rock and a structural plane, the normal force, shearing force and bending moment of the structural plane are used as unknown quantities, a static permission stress field satisfying an equilibrium equation considering the translation and rotation effects of the rigid block unit, structural plane shear yield conditions, structural plane tensile yield conditions, structural plane rotational yield conditions and static boundary conditions is constructed, an overload coefficient is used as a target function, and a lower-bound linear mathematic programming model is built; the linear mathematic programming model is solved by means of an interior point algorithm, a strength reserve coefficient is solved by means of an iterative method at the same time, and the lower-bound solution and corresponding yield area of the overload coefficient or the strength reserve coefficient of the jointed rock slope are acquired. The method has the advantages that the concept is clear and the computational accuracy is high, and the method can be applicable to bearing capacity analysis of translational or rotational failure of the jointed rock slope.

Devices for anchoring and/or blocking spinal implants in an intervertebral disc space are disclosed. In one aspect of the invention the device includes a rigid blocking member having one end unconnected and free to block a spinal implant, and another end attached to a securing member to secure the blocking member to the spine. Methods for using the inventive anchoring/blocking implants are also provided.

A fuel delivery rail assembly for supplying fuel to a plurality of fuel injectors in an engine is provided. The assembly includes an elongate conduit having a longitudinal fuel passage therein, a fuel inlet pipe, and a plurality of sockets. One wall of the conduit opposite to the socket mounting wall includes a flat or arcuate flexible absorbing surface. A high-frequency noise suppressing device such as a binding member is fixed within the conduit for connecting the one wall and the socket mounting wall. The binding member includes is comprised of a pipe, a bar or a rigid block. The binding member may be a body portion of an extending socket terminating with the one wall. Thus, fuel pressure pulsations and shock waves are reduced by bending of the absorbing surface, and emission of high-frequency noise is eliminated.

The invention relates to an upper-bound limit analysis method of ultimate bearing capacity of rock slope considering rock translation and rotation effects at the same time, and belongs to the technical field of rock slope bearing capacity analysis. According to the method, based on a plastic upper-bound limit analysis theory, by means of multiple freedom degree rigid block unit discrete jointed rock slope, the translational speed and rotational speed of the rigid block unit centroid are used as unknown quantities, the translation and rotation mechanical effects of rocks are considered at the same time, the overload coefficient of the slope is used as a target function, and plastic flowing conditions satisfying shear failure, tensile failure and rotational failure of a structural plane are constructed; then combined with a virtual work principle and speed boundary conditions, a linear mathematic programming model for working out the ultimate bearing capacity of the jointed rock slope is built, the linear mathematic programming model is solved by means of a simplex method, a strength reserve coefficient is solved by means of an iterative method at the same time, and finally the upper-bound solution and corresponding failure mechanism of the ultimate bearing capacity of the jointed rock slope are acquired. The method has the advantages that the concept is clear and the computational accuracy is high.

An adhesive composition comprising: (i) a one part curable epoxy adhesive and (ii) a low profile additive (LPA), the low profile additive being a polymer that is compatible with the epoxy adhesive such that it forms a single phase when admixed with the adhesive composition and that separates from the adhesive to form a network of stress-absorbing nodules therein when the adhesive is cured, the low profile additive being present in an amount sufficient to prevent or reduce shrinkage and/or the formation of voids or cracks when the adhesive is cured. In one embodiment the LPA is a block copolymer including at least one flexible block and at least one rigid block that makes the low profile additive compatible with the epoxy adhesive such that a mixture of the uncured epoxy resin and the low profile additive forms a homogenous solution and as the epoxy resin is cured, the low profile additive forms a stress absorbing network of nodules in the cured epoxy resin matrix.

A land grid array socket includes an insulative housing (2), a stiffener (4) partly covering and reinforcing the housing, a metal clip (5) pivotably engaged on one end of the stiffener, and a lever (6) mounted on two opposite ends of the stiffener for fastening the clip onto the housing. The housing includes a floor (20), a number of sidewalls (24, 26) extending upwardly from the floor and a receiving space defined between the bottom wall and the sidewalls. A pair of step (263) is formed on the floor, for sustaining the LGA package (3) thereon. The sidewall that is far from the clip defines a plurality of rigid blocks (2683) in an inner side for resisting scrape between the sidewall and the LGA package. Therefore, the sidewall of the housing can be protected from scraping damage during insertion of the LGA package into the housing.

The invention relates to a mark-point-free real-time restoration method of a three-dimensional human form and a gesture. The mark-point-free real-time restoration method faces toward a monocular depth video, and real-time restoration of the human form and the gesture is achieved by aid of a human body parameterized model. The mark-point-free real-time restoration method comprises the steps of 1) human body parameterized model extraction, wherein the human body parameterized model is decomposed into a form deformation sub model and a gesture deformation sub model, a human library is used for training the human body parameterized model to solve part of parameters, the characteristic vector parameter of the form deformation sub model is solved, and the weight of each rigid block in the linear skin deformation of the gesture deformation sub model is solved; 2) human body form offline restoration; 3) human body gesture online restoration. Through a linear deformation and variation method, change of each rigid block in the linear skin deformation of the gesture deformation sub model is solved in real time. Therefore, the gesture of a human body is restored on line.

The invention relates to a numerical simulation algorithm for the engineering properties of coarse-grained soil by using DDA (Discontinuous Deformation Analysis). The numerical simulation algorithm comprises the following steps of: randomly generating polygons, carrying out grain release according to intrusion judgment, generating polygonal grains meeting the requirements on a certain graduation in predetermined release areas according the laboratory test requirements of the coarse-grained soil, generating a loosely-distributed granular system, and generating an actually-close stacked body through stacking simulation, wherein the positions of the grains are random, the number of sides and the length of side are also random, and the grains are not intersected with one another; and by referring to the laboratory triaxial test, adding a flexible material to two sides of a test sample and dispersing the test sample into a block body, adding rigid plates to the top and the bottom of the test sample, rigid blocks are placed at two sides of a top loading plate in order to ensure the vertical action of an axial pressure, and applying the DDA to carry out numerical simulation on the mechanical test of the coarse-grained soil after respectively applying test loads, i.e. a confining pressure sigma3 and an axial pressure sigma1, to the two sides and the top of the test sample.

The present invention discloses a method for calculating the rock failure probability in a rock slope. The method comprises: step 1, formulating a calculation parameter of a rock slope; step 2, establishing a limit state function of the rock slope; step 3, discretizing the rock slope by using rigid block elements; step 4, establishing an upper bound linear programming model for solving the rock failure probability; and step 5, solving the upper bound linear programming model by using a Monte Carlo method, and calculating the rock failure probability. According to the method disclosed by the present invention, a two-dimensional rock slope is taken as a research object, the upper bound theorem of plastic limit analysis, and the rigid block element discrete technology, the linear programmingmethod and the Monte Carlo method are combined to establish a mathematical programming model of the upper bound method for calculating the rock failure probability; and the model can be effectively used to calculate the rock failure probability and obtain the failure probability and the corresponding failure mode of all rock blocks in the rock slope.

The invention discloses a plastic limit analysis upper-bound method for ultimate bearing capacity of a masonry retaining wall, relates to a plastic limit analysis method for solving ultimate bearing capacity of masonry retaining, and belongs to the technical field of side-slope protection projects. The method comprises the steps of taking the masonry retaining wall as a research object; simulating mechanical properties of masonry by adopting a rigid block element based on a theory of the plastic limit analysis upper-bound method; establishing external force overload conditions by taking a displacement rate of the centroid of the block element as an unknown variable and introducing a Rankine earth pressure theory; establishing a kinematically admissible velocity field meeting rigid block unit and mortar layer surface deformation compatibility conditions, plastic flow constraint conditions, internal and external power equality conditions and velocity boundary conditions; building a nonlinear mathematic planning model for solving the ultimate bearing capacity of the masonry retaining; and solving a minimum value of an ultimate load by using an optimization algorithm. The method has the characteristics of definite concept, high calculation precision and the like, and can be applied to the analysis of the bearing capacity of the masonry retaining wall.

The invention discloses a large-stroke two-translation one-rotation precision positioning platform which comprises a base and a movable platform body arranged in the platform. The base is connected with the movable platform body through three hinge amplification mechanisms evenly distributed in the circumferential direction of the movable platform body and three composite parallel plate flexible guide mechanisms. One end of each hinge amplification mechanism is flexibly connected with the base, the other end of each hinge amplification mechanism is flexibly connected with the movable platform body, an input end is arranged in the middle of each hinge amplification mechanism, and the input ends are connected with piezoelectric ceramic actuators. Each composite parallel plate flexible guide mechanism comprises eight parallel flexible plates and four rigid blocks distributed in the circumferential direction of the movable platform body. The three composite parallel plate flexible guide mechanisms and the three piezoelectric ceramic actuators are evenly distributed in the circumferential direction of the movable platform body at intervals. The large-stroke two-translation one-rotation precision positioning platform is simple and compact in structure, large in output displacement, high in axial rigidity and capable of being used as an auxiliary positioning platform of a nano microoperation system for achieving microscale feeding and precision positioning.

In some embodiments, a durable solid-wood door or other rigid block assembly includes two generally-planar, mutually-parallel solid-wood boards each having a plurality of mutually-parallel dovetail-connection channels running generally along an internal surface of each of the boards, and a solid-wood central keying structure disposed between the two solid-wood boards. The central keying structure includes a plurality of two-sided sliding dovetails keys sized to slide within the dovetail-connection channels to secure the two-mutually-parallel solid-wood boards to each other via sliding dovetail connections to the central keying structure. Alternating wood grain orientations may be used to reduce warping. Each board may include multiple laterally-adjacent monolithic slabs interconnected via tongue-and-groove edge connections, with the dovetail connection channels extending across multiple slabs. An adhesive and/or fasteners secure the two boards in a fixed position relative to each other, creating a solid block structure.

The invention discloses a device for testing compression in a rectangular steel plate surface, belonging to the field of civil engineering professional testing devices. The device is formed by connecting a square main frame with H-shaped steel through a bolt, and can be used for self-balance in a test load. In the device, a load guide rigid block is arranged between a hydraulic jack and a steel plate loading edge, so that uniform compression loading is realized, and off-plate simple support constraint conditions are provided for four sides of a test steel plate through a wedge-shaped support plate. In the entire testing device, the size of a component can be adjusted flexibly according to the size of a test piece, so that the loading requirements of steel plates of different sizes are met. Due to the adoption of the device, uniform compression testing in the rectangular steel plate surface is more convenient, and the batch testing requirements of test pieces are met simultaneously; and the device can be applied to civil engineering teaching and scientific research testing.

A surgical instrument for treating body tissues through narrow body passages employs an elongated cantilevered beam having a proximal end supported in a rigid block and a narrower distal end extendable through the narrow passages. One or more piezoelectric actuators are fixed to the beam surface and energized from an AC source through electrodes interspersed with the piezoelectric actuators to produce oscillatory motion of the beam distal end in multiple modes of movement with sensing electronics to monitor and control the distal mechanical movement.

A process for the production of a lignin based polyurethane products is provided. The process comprises mixing at least one dried lignin and at least one isocyanate to form a lignin-isocyanate mixture, and submitting the lignin-isocyanate mixture to a polymerization reaction. The polymerization reaction may include heating the lignin-isocyanate mixture, adding at least one catalyst to the lignin-isocyanate mixture, or mixing the lignin-isocyanate mixture with a resin comprising at least one polyol, in the presence of at least one catalyst. The lignin based polyurethane products obtained by the process may be rigid foams, flexible foams, rigid boards, rigid blocks, coatings, packagings, adhesives, binders, sealants, elastomers, Thermoplastic Polyurethanes or Reaction Injection Moldings. There is also provided a mixture comprising at least one dried lignin and at least one isocyanate for use in the production of a lignin based polyurethane products.

The invention provides a test system for testing damping performance of a high-temperature material. The test system adopts a double-layer chamber structure comprising a high temperature vacuum chamber and a normal temperature vacuum chamber, wherein the high temperature vacuum chamber is used for heating a test piece (7); the normal temperature vacuum chamber is positioned below the high temperature vacuum chamber, and the high temperature vacuum chamber and the normal temperature vacuum chamber are communicated through a ring-shaped water cooling jacket (6); a shock exciting mechanism is positioned in the normal temperature vacuum chamber; a heating body (8) and a thermocouple (9) are arranged on an upper thermal insulation layer (13) and are communicated with an electric furnace control cabinet (29); and a data analysis system (24) and a data acquisition system (25) are connected with a displacement sensor (28) and an accelerometer (17) through data cables respectively. Because the double-lug cantilever beam test piece (7) is adopted, the contact damping influence due to direct excitation and the error due to the rotation of a central rigid block of the test piece are avoided, the test temperature of the test piece is changed, the air damping influence is eliminated, and the isolation of an electromagnetic vibration exciter and the high-temperature environment can be effectively realized; moreover, the test system also has the characteristics of simple structure, convenient use, and accurate and reliable test results.