291 results about "Pull off force" patented technology

An optical measuring device having multiple optical paths between one or more light emitters and one or more light detectors and/or providing at least two sets of wavelength of light along at least one path, with a final measurement being produced as a combination of measurements of the sets of wavelengths of light taken along one or more of the optical paths. Features that contribute to increased safety and ease of use include providing (1) a receiving cavity in a proximal end of an insertion rod that holds a free end of a circuit connector to keep it from becoming tangled or snagged, (2) a mechanism to keep the sensor within an introducer tube during storage and insertion and to expose a portion of the sensor only when the sensor is applied to the unborn baby, (3) a tab on the insertion rod to prevent the circuit connector from becoming tangled or snagged within the introducer tube, (4) a rotating feature whereby if a torque applied on the sensor exceeds a first predetermined amount, the sensor rotates, and a disengaging feature whereby the sensor detaches from insertion rod if a pull-off force exceeds a second predetermined amount, the rotating and disengaging features being independent of one another, (5) a circuit connector that includes at least one of the following features: (a) a stiffening member provided at the proximal end to minimize bending, (b) a shielding layer, and (c) at least one slit to increase the flexibility of the circuit connector, and (6) an interface that includes an identification element that is detected by an external circuit only if the circuit connector is connected to the interface. The present invention also pertains to a method of manufacturing a needle that is used in an invasive sensor, and preferably for fetal monitoring, that provides features not heretofore available in conventional sensors.

A flexible package is provided with a shrouded slide fastener closure. Fastener tracks are deformed at each end to provide an end stop to limit slider movement. A stop of reduced area with increased pull off force performance is provided. Features of the end stop include an L-shaped shoulder located above an underlying finger portion comprising an undeformed portion of the fastener tracks. The remainder of the end stop is formed by heating, softening and displacing portions of the fastener track material.

Disclosed is a cable having reduced surface coefficient of friction, and the method of manufacture thereof, in which the central conductor core is surrounded by a sheath in which at least the outer portion is of non-metallic, polymeric material. A pulling lubricant is incorporated by alternate methods with the material from which the outer sheath portion is constructed and is effective to reduce the required pulling force on the cable during installation. Specific compositions are disclosed for cables of the NM and THHN type.

A tamper-evident reclosable package having a header that is tack sealed to the zipper. A light tack, in the form of a light weld, is made at the end of the package header. The header is the top portion of the package and is designed to shroud the zipper. The header serves as a tamper-evident feature, and also serves to maintain cleanliness and aesthetics of the package. The header must be tom before a person can gain access to the contents of the package. Typically, means for preferential tearing are provided for easy removal of the header. The tack seal contributes to the maintenance of the cleanliness and aesthetics of the package, while still allowing easy removal of the header. The tack is light (i.e., low bond strength or pull-off force) in order to not make it significantly more difficult to open the package.

A tunneler is provided that includes a first end portion configured for insertion into a lumen of a catheter. The tunneler also includes a second end portion opposite the first end portion and a sheath member disposed between the first and second end portions. The sheath member includes a plurality of inner diameters that increase from one end to the other end thereof. Alternatively, the plurality of inner diameters taper from one end to the other end thereof. The inner diameter of the sheath member engages an outer surface of the catheter to create an interference fit therebetween. The interference fit increases a catheter pull-off force. A method of using the tunneler is also disclosed.

A tension control device (10) for regulating the payout of filamentary material (24) from a spool (22) includes a fixed support (12, 14), a swing frame assembly (16) pivotably mounted on the fixed support and predisposed to a holding position, and a spindle assembly (20) carried by the swing frame assembly. The spindle assembly (20) carries the spool (22) and rotates with the spool as the filament is pulled off the spool. A braking assembly (18) is pivotably mounted on the fixed support (14) and is movable with the swing frame assembly (16). A cam (30) is fixably mounted on the fixed support and bears against the braking assembly (18) and forces the braking assembly to control the rotation of the spindle assembly. A pull-off force applied by filamentary material causes the swing frame assembly to move away from the holding position and allows rotation of the spindle assembly. A loading assembly fixably mounted on the fixed support positions the swing frame assembly and the braking assembly to a holding position that must be overcome by tension applied by the filament in order for the spool to begin rotation.

Methods and systems are disclosed for evaluating an adhesive layer such as a tack coat. In one embodiment, a portable apparatus is provided to test a tack coat layer prior to applying an overlay. The portable apparatus includes a tripod configuration placed on a surface, a plate conformed to the surface by a load and a torque wrench-applying a pull-off force to test the strength of the surface. In other embodiments, a portable apparatus is provided to test a tack coat layer prior to applying an overlay, where the portable apparatus does not include support members.

The invention discloses an internal expansion fixture for thin-walled parts. The fixture comprises: a machine tool connection plate, a tie rod flange plate, a positioning seat, and a fixed mandrel shaft. When the fixture disclosed by the present invention is in operation, under the action of the pull force of the pull rod of the machine tool, the pull force is transmitted to the elastic expansion sleeve through the pull rod flange and the connecting rod. Since the elastic expansion sleeve is limited by the connecting rod, it cannot rotate freely and can only move axially on the tapered surface of the fixed mandrel. At the same time, when the elastic expansion sleeve moves axially, it passes through the tapered surface of the fixed mandrel, and converts the pulling force into a radial expansion force and a pulling force toward the positioning surface. It is because of the above-mentioned pulling force toward the positioning surface that the parts will be automatically pressed against the positioning surface, and the parts will not be pressed tightly due to the operator's mistakes, resulting in gross errors in the processing of the parts. Therefore, the product quality of the parts is effectively improved, and the processing benchmark of the next process is guaranteed.

The invention discloses a large deformation tensile force testing system, which is used for testing the large deformation tensile force of an anchor rod or an anchor rope. The system comprises a main rack, a rear chuck component, a front chuck component, a tension device, a measurement and control device, a control module and an analysis module, wherein the rear chuck component is arranged at a first position in the longitudinal direction of the main rack; the front chuck component is movably arranged at a second position in the longitudinal direction of the main rack; the tension device is arranged closely to one end of the main rack and connected with the front chuck component, and tensions a test piece clamped between the two chuck components in a set control way; a sensing module of the measurement and control device senses the displacement of the tension device and real-time tensile force applied to the test piece, generates real-time data, and transmits the real-time data to the analysis module and the control module; the control module controls a test process to be performed according to a set test condition according to the set control way and the input of the sensing module; the analysis module analyzes the input of the sensing module to generate a test result; and an output module outputs the test result. By the large deformation tensile force testing system, static parameters of various anchor rods and anchor ropes can be accurately and effectively obtained.

The present invention relates to a suspended large steel frame support structure with an additional damping device, which is applicable for high buildings and composed of a main structure and a sub-structure. The main structure is adopted with a large steel frame support structure, which is characterized that the support structure is composed of a splayed tough support and a reversal splayed pre-stress cable; the sub-structure is suspended on a large beam of the main structure; a horizontal damping device is arranged between the sub-structure and the main structure. The reversal splayed pre-stress cable can offset large push generated by the splayed tough support and transmit load in the large beam span to a large column in the form of pull to reduce the shearing force, the bending moment and the deflection of the beam, therefore, compared with a large frame structure, the large steel frame support structure can improve lateral resistance; compared with a large truss structure, the large steel frame support structure relieves collective stress. A damping device provided between the main structure and the sub-structure consumes more horizontal momentum, and greatly reduces the displacement and the acceleration of suspended floors.

The invention discloses a measurement device for the thermal shrinkage ratio of a pull wire. The principle of measurement is as follows: properly tightening the pull wire through an electric platform, recording the original length L of the pull wire through a displacement sensor, moving the electric platform to enable the pull wire to be in a relaxed state, placing the pull wire into an oven, heating for a while, taking out the pull wire, cooling to a testing ambient temperature, moving the electric platform to tighten the pull wire to a same degree, recording the length of the pull wire through the displacement sensor, and calculating the thermal shrinkage ratio of the pull wire according to a thermal shrinkage ratio calculation formula epsilon=(L-S)/L*100%. The measurement device disclosed by the invention realizes the automatic measurement of the thermal shrinkage ratio of the pull wire by the steps of driving the pull wire to move through the electric platform, measuring the tensile force born by the pull wire using a tension sensor, and measuring the length change of the pull wire through the displacement sensor.

The invention relates to the technical field of material testing, and provides a test method and a test device for the piezoelectric coefficient of a piezoelectric material. The test method comprises the steps that a pulling force is applied on two opposite sides of a sample to be tested along the extension surface of the sample to be tested; a pulling force signal applied on two opposite sides of the sample to be tested along the extension surface of the sample to be tested is acquired, and an electrical signal between upper and lower electrodes is acquired; a force signal applied on the sample to be tested is determined based on the acquired pulling force signal, and the surface charge density generated by the to-be-tested sample under the pulling force is determined according to the acquired electrical signal; and the piezoelectric coefficient of the sample to be tested is determined based on the determined surface charge density and the determined force signal. The test device and the test method can test the piezoelectric coefficient of a piezoelectric polymer and other materials, and have the advantage of high applicability.

The invention discloses electronic equipment, and belongs to the technical field of electronic products. The electronic equipment comprises a flexible screen, a foldable shell, a push-pull device, a first guide shaft and a second guide shaft, wherein a containing cavity is formed between a bendable part of the flexible screen and the shell, the push-pull device is arranged in the containing cavity, a first end of the push-pull device is connected with the shell, and a second end of the push-pull device is connected with the bendable part of the flexible screen; under the condition that the flexible screen is in an unfolded state, the distance between the bendable part and the shell is a first distance; and under the condition that the flexible screen is in a folded state, the push-pull device outputs pull force towards the shell to the flexible screen, and the distance between the bendable part of the flexible screen and the shell is a second distance, wherein the second distance is smaller than the first distance. The electronic equipment provided by the invention can solve the problem that in a folding process of the flexible screen, the flexible screen is damaged due to a layering phenomenon at a folding position.

A self-compensating tension control device for regulating the payout of filamentary material from a spool includes a fixed support and a spindle assembly pivotably mounted to the fixed support, wherein the spindle assembly rotatably carries the spool of filamentary material. A pull-off force imparted by the filamentary material causes angular movement of the spindle assembly and rotation of the spool. A braking assembly mounted to the fixed support and coupled to the spindle assembly applies a braking force corresponding to an angular position of the spindle assembly.

The invention claims an internal shrinking tensile rope parachute. The basic idea of the invention is as follows: using an internal shrinking tensile rope, which can be shortened after being aerated and can produce tensile force and can be prolonged after being stretched and can compress air, to replace the rope tape of the existing parachute system, or adding an internal shrinking tensile rope on the parachute system, and adding a set of air supply system and a sensing control system. Said replaced rope tapes comprise a parachute lanyard (1), a connection rope (2), a binding rope (3), a close rope (4) and so on. When the parachute system with said structure is used, the contraction and stretching of the rope tape is controlled to control the size of the tensile force produced by the rope tape so as to change the shape, position relationship and aerodynamic characteristic of the parachute system to further reduce overload produced on the parachute system, and change the motion speed and direction of the parachute system and reduce landing speed of air-dropped articles. The parachute system with said structure is added with new functions and can probably reduce weight of the parachute system.

The invention discloses a closed three-dimensional pull rope type wave energy storage device. The closed three-dimensional pull rope type wave energy storage device comprises a closed floater and at least two heavy balls, wherein anchor chains are respectively connected to the lower ends of the heavy balls, wire ropes are respectively connected to the upper ends of the heavy balls, an equipment cavity and an energy storage cavity which are isolated each other in a sealing mode are formed in an inner cavity of the floater from top to bottom, at least two groups of oscillation rocker pumping devices are installed in the equipment cavity in an axisymmetric mode by using the vertical center axis of the equipment cavity as a symmetric axis, rope guide tubes which are uniformly distributed along a circumferential direction and correspond to each group of the oscillation rocker pumping device penetrate through the energy storage cavity, the upper ends of the wire ropes respectively penetrate through the rope guide tubes and are connected with the corresponding oscillation rocker pumping devices, and the oscillation rocker pumping devices are driven to continuously pump compressed air into the energy storage cavity so as to be stored by the tensile strength change of the wire ropes. The invention further discloses a closed three-dimensional pull rope type wave power generation device. The closed three-dimensional pull rope type wave energy storage device and the closed three-dimensional pull rope type wave power generation device have the advantages of simple structure, reliability in transmission, high corrosion resistant capability, simplicity in maintenance, good adaptability and the like, and movable joints are not soaked in seawater.

The invention discloses a pull direction estimation method for a tethered satellite. The method specifically comprises the steps of 1, determining a reference coordinate system and a known physical quantity; 2, acquiring an estimated value, FORMULA, of torque by observing based on a disturbance observer; 3, decomposing a pull force F acting on the satellite to be along a r direction, namely radial direction of a tether, and a direction perpendicular to the radial direction r of the tether, and determining a component force Fr along the radial direction of the tether and a component force, FORMULA, along the direction perpendicular to the radial direction of the tether; and 4, determining the direction of the pull force F by using the components forces Fr and FORMULA. Compared with traditional methods, the method has far lower requirements on hardware and software, and is also greatly reduced in estimation error in the premise of high enough computation accuracy and accurate enough disturbance observer model.

The invention provides a film tension detection device and method. The film tension detection device comprises a driving motor and a lead screw, wherein the lead screw is connected with an output end of the driving motor, guide rods are arranged on two sides of lead screw, an extension test mechanism and a shear mechanism are arranged on the lead screw, the extension test mechanism comprises a movable pull plate sleeving the middle of the lead screw, and a tension lead screw nut matched with the lead screw is fixed in the middle of the movable pull plate; a fixed pull plate fixed on the guide rods is arranged at the front end of the movable pull plate, a tension sensor is fixed on the rear side of the fixed pull plate, and a through hole for being penetrated by the lead screw is formed in the middle of the fixed pull plate; pressure plates for clamping a film are arranged at the upper ends of the movable pull plate and the fixed pull plate; and the shear mechanism for detecting the film is arranged on the rear side of the fixed pull plate. According to the film tension detection device, two procedures of film extension and shear are realized by virtue of a lead screw nut mechanism, so that the working efficiency is greatly improved, and the production cost is saved.

The invention pertains to the use of an ice-phobic coating layer for de-icing or anti-icing of technical aerospace equipment such as aircraft's carburettor(s), pitot tubes, engines and parts thereof, and the rotor blades and generators and parts thereof of wind turbines, and wherein said coating layer: a) exhibits sessile water drop contact angle of at least 75° and a difference in dynamic water drop contact angle of at most 30° , more preferably at most 25° (i.e. low wetting hysteresis), at ambient air conditions, said contact angles measured according to ASTM D7334-08; b) exhibits micro hardness of at least 200 HV (Vickers units) if exposed to fluid velocities lower than 50 m/s and/or micro hardness of at least 800 HV, preferably at least 1000 HV, if exposed to fluid velocities higher than 100 m/s (representing aircraft wing conditions), said micro hardness measured according to ASTM E384-08, and/or exhibits a micro hardness of Ra less than 0.5 μm; c) exhibits corrosion rate of less than 0.1 μm/year; d) is chemically inert; and e) has a mechanical strength in terms of pull-off force/surface unit of more than 10 MPa, preferably more than 20 MPa, measured according to ASTM D4541-09e1.

The invention provides a multi-winch synchronization control method and control system. The control system comprises a control device and a plurality of pull force sensors. Each pull force sensor is hinged to one arm head pulley of a multi-winch synchronization mechanism. The control device connected with the pull force sensors acquires a current lifting pull force value, obtained by the pull force sensors, at a steep wire rope end, and performs deviation calculation on the current pull force value and the previous pull force value to obtain a pull force difference value; under the circumstance that the absolute value of the current pull force value is larger than the preset pull force difference value pre-stored by the control device, when the pull force different value is larger than zero, the control device controls winding drums of the winches to slow down, and when the pull force difference value is smaller than zero, the control device controls the winding drums of the winches to accelerate. Due to the fact that the steel wire rope end is close to a hanging hook, balance lifting control of the hanging hook can be accurate by the control method collecting pull force value of the steel wire rope end, and multi-winch synchronization control precision can be increased effectively.