Abstract: An object of the present invention is to provide a barrier discharge device capable of increasing the combustion efficiency of an engine while overcoming the problems of the cumbersome replacement of the electrodes and the commercialization of the device. The barrier discharge device of an engine includes a dielectric body and at least two barrier discharge electrodes which are held inside the dielectric body and to which voltages for barrier discharge are applied, wherein each of the barrier discharge electrodes are not exposed to the inside of a cylinder bore and are arranged so as to surround the cylinder bore.

Abstract: A laser ignition device for an internal combustion engine, encompassing an ignition laser having a combustion chamber window, such that until startup of the laser ignition device, the combustion chamber window is equipped with a protective layer.

Abstract: In an plasma generation device 30 that generates electromagnetic wave plasma by emitting electromagnetic waves to a combustion chamber 21 of an internal combustion engine 20, combustion is promoted by increasing the amount of gas to be brought into contact with the electromagnetic wave plasma in the combustion chamber 21. An antenna 36 extends along a ceiling surface of the combustion chamber 21. The antenna 36 is provided with an adjustment unit 37 that changes the location of a strong electric field on the antenna 36, which is supplied with the electromagnetic wave. During a generation period of the electromagnetic wave plasma, a control device 10 controls the adjustment unit 37 based on a condition of the combustion chamber 21 and changes the location of the electromagnetic wave plasma.

Abstract: An onflow element for an installation for generating electrical energy from hydropower. The onflow element includes an onflow wall with an onflow side as well as a free immersion edge delimiting the onflow wall, wherein the onflow wall has a bending seen in a cross sectional plane transverse to the free immersion edge. The bending is designed in a manner such that the onflow wall is designed arched towards an onflow direction directed to the onflow side.

Abstract: A water-based power generating installation includes a water based power generating device operable to derive power from a body of water, and to export that power via a power export cable, and an infrastructure arrangement for providing a power export connection from the installation, and including infrastructure equipment for the installation, which infrastructure equipment serves to connect the power generating device with the power export connection.

Abstract: A barge has been designed to function in a four-season environment with a plurality of configurable, peripheral bays (bays) that support sustainable energy capture devices (devices). The barge is round with bays that curve inward, opposite the barge's curvature, and where devices can be placed. The bays allow the devices to be removed for maintenance by support ships. The barge is buoyant and floats independently of the devices in each bay. The barge is hollow and its entire circumference can be traversed by the crew. A central platform is contained within the barge by cables that may have wave energy capture mechanisms installed. The central platform and can be accessed by the crew through one or multiple floating walkways. Devices installed at the bays will float independently of the barge and may have wave energy capture mechanisms on them at the bay-device interface.

Abstract: A system and method for transporting a first and second airfoil using a center railcar coupled to two additional railcars. A pair of root brackets support the root ends of the two airfoils on the two additional cars, aligning the two airfoils over the center car. A lower sling stand on the center railcar has a pair of vertical side members extending upwardly to hang a lower sling that support the first airfoil. An upper sling stand has a base that is supported by the lower sling stand, and also has a pair of upper side members that support an upper sling. The second airfoil is supported by the upper sling. The upper sling stand is fixedly supported on the lower sling stand so as to support the second airfoil above the first airfoil in overlapping fashion.

Abstract: A wind turbine rotor blade having an aerodynamic profile which is formed in a longitudinal section of the rotor blade and which has a pressure side, a suction side, a profile leading edge and a profile trailing edge with a thickness of 3 mm or greater, characterized by a plurality of bristles which are arranged on the profile trailing edge and which are arranged in a suction-side row and in a pressure-side row, the suction-side row forming an aerodynamic surface which forms a smooth continuation of the suction side, and the pressure-side row forming an aerodynamic surface which forms a smooth continuation of the pressure side.

Abstract: According to the present invention, use is made of a drag-type blade in which the blade is constituted vertically and in multiple blocks while the inside thereof is formed so as to have an overlapping region, thereby achieving an aerodynamic characteristic whereby there is a large initial torque for rotating the blade of the wind energy electricity generator from the stationary state such that the rotational moment is increased. On the outside thereof, use is made of airfoil-type blades, thereby obtaining rapid rotational acceleration with tip-speed ratio no less than 1.0 and effecting wind energy electricity generation even with a low wind velocity regardless of the wind direction, and thus the present invention is economic and can be installed at low cost unaffected by place or position and is environmentally friendly while nevertheless being able to effect highly efficient wind energy electricity generation.

Abstract: A method of operating a wind turbine of a wind park is provided. In a first step a status of a communication connection to a wind park controller is checked. When the status of the communication connection is positive, the wind turbine will be operated in accordance with at least one reference set point received from the wind park controller. When the status of the communication connection is negative, a substitute reference set point will be determined as a function of a present power output of the wind turbine and the wind turbine will be operated in accordance with the substitute reference set point.

Abstract: The adaptive pitch control system for wind generators is utilized in variable speed doubly fed induction generator (DFIG) systems. An adaptive neural network generates optimized controller gains for pitch control. The pitch controller parameters are generated using intelligent differential evolution, a type of genetic algorithm. A back propagation neural network is trained using the generated pitch controller parameters, thereby tuning the weights of the network according to the system states in a variable wind speed environment.

Abstract: A method and a control device for damping an oscillatory movement of the top of a tower of a wind turbine are provided. The described method includes (a) rotating a rotor being rotatably attached to a nacelle of the wind turbine with a rotational speed, and (b) yawing the nacelle of the wind turbine around an axis being aligned with the longitudinal axis of the tower with a yawing speed. Thereby, a yawing movement being associated with yawing the nacelle is coordinated with the oscillatory movement in such a manner that a gyroscopic torque resulting (i) from rotating the rotor and (ii) from yawing the rotor damps the oscillatory movement of the top of the tower. A wind turbine comprising such a control device and a computer program for controlling this method are also provided.

Abstract: A computer-implemented method of operating a wind turbine park including operating wind turbines includes recording a plurality of sound pressure measurements of the wind turbine park, thereby generating a sound recording. The method also includes calculating values for a plurality of acoustic features associated with the sound recording. The method further includes determining a relationship between the calculated values for the plurality of acoustic features and modeled acoustic features values resident within a probabilistic auditory model of the wind turbine park. The method also includes distinguishing a first contribution to the sound recording originating from the at least one operating wind turbine from a second contribution to the sound recording originating from non-wind turbine sources based on the determined relationship.

Abstract: A Wind Power system employing a three-tube tower, double, counter-rotating blades and a means to carry the wind energy power to a remotely located generator. The system employs a method to transmit the power from a horizontal vector to a vertical vector by means of a 90° magnetic translating method which delivers the power with no power loss. The system, by the physical placement of the generator, transformer, switches and controls, provide a great reduction in tower support weight and further provides for a cost efficient system. To further the overall efficiency of the system, special designs of the leading edge of the blades are fitted with tubercles which allow the blades to be pitched at greater angles, thereby increasing the power which can be gathered. This system, due to the teachings of this invention, can be constructed, installed and maintained at a substantially lower cost than that of a wind system currently being employed in the industry.

Abstract: A wind turbine is provided. The wind turbine comprises a generator, a power converter for converting at least a portion of electrical power generated by the generator, an energy dissipating unit and a controller. The power converter comprises a generator-side converter, a grid-side converter and a DC (direct current) link there between. The energy dissipating unit is operatively coupled to the DC-link. The controller is adapted to activate the energy dissipating unit to dissipate energy from the DC-link in response to a shutdown request.

Abstract: A system for identifying the likelihood of a wind turbine rotor blade striking a wind turbine tower comprises a device for sensing bending of a wind turbine rotor blade and a device for sensing bending of a wind turbine tower. In a preferred embodiment Long Period Grating (LPG) sensors are used to measure bending of the tower. Preferably a plurality of LPG sensors is provided along the length of the blade. In one embodiment at least one of the LPG sensors comprises two sensing elements arranged to sense in perpendicular directions. In another embodiment a plurality of LPG sensors are provided each on different sides of the wind turbine tower. A processor uses the sensed blade and tower bending to determine whether the distance between the blade and the tower will be below a predetermined minimum value.

Abstract: One exemplary method of renewable energy storage includes converting a part of the electrical energy, from a generator, in accordance with an electrical grid; and using a control system to steer another part of the electrical energy, from the generator, to a heating module, to heat a substance in a tank, thereby increasing a pressure in the tank. The method also includes using the control system to introduce a transmission agent into a heat exchanger in the tank, and using the heated transmission agent to drive a turbine. A sensor provides information, about a renewable energy stream, to the control system. The control system, responsive to the information, acts to control a valve coupled between the heat exchanger and the turbine, thereby enabling a constant transfer of energy to the electrical grid.

Abstract: A cold state engine utilizing air heat energy to output work, refrigeration and water, includes a first cycle and a second cycle. The first cycle comprises of vaporizer, expander, and working fluid pump. The second cycle includes a vaporizer, circulation pump, air heat exchanger. The two cycles are opera lively interconnected via at least a vaporizer, piping, valves, sensors and a generator. Using air or water as a high temperature heat source, an expander generates cryogenic liquid as a low temperature heat source, using natural gases (such as N2, He, Air, CO2 etc.) as a working fluid, based on methods of cryogenic working fluid thermodynamic-refrigeration cycle and frost-free two stage heat exchange cycle.

Abstract: A Hall effect thruster includes at least one tank of gas under high pressure, a pressure regulator module, a gas flow rate control device, an ionization channel, a cathode placed in a vicinity of an outlet from the ionization channel, an anode associated with the ionization channel, an electrical power supply unit, an electric filter, coils for creating a magnetic field around the ionization channel, and an additional electrical power supply unit for applying a pulsating voltage between the anode and the cathode.

Abstract: Electronically controlled linear pump drive actuator for a dispensing pump has a servo motor unit having a stator with front and rear faces and a central hollow cavity, a rotor coaxially in the hollow cavity with a front portion having a front end with an open central bore and a shaft with a stepped diameter forming a rear extension, front and rear support members respectively for the front and rear faces, a support bearing in the rear member, a front bearing, and a position sensor; a ball screw drive mechanism having a nut connected with the rotor and a screw shaft having a front end section; a hollow cylinder attached to the front member's front end; an actuator member axially moveable in the hollow cylinder with a central rear part fixed to the front end section, and a hollow front part; and a pump plunger adaptor.

Abstract: A flow cell for use in a microfluidic detection system. The flow cell includes a flow cell body having a channel that extends along the flow cell body. The flow cell body has a substrate material that extends along the channel and that is transparent to at least one of excitation light or light emissions. The channel has a functionalized channel surface that includes reactive groups configured to attach to molecules for biochemical analysis. The flow cell also includes fluidic inlet and fluidic outlet ports provided on the flow cell body and an electroosmotic (EO) pump held within the flow cell body in fluid communication with the channel. The EO pump is operable to induce flow of a solution from the inlet port to the outlet port and along the functionalized channel surface.

Abstract: Improvements in compressor manufacture are achieved by utilizing polymeric components which retain at least 90% of their dimensions after being exposed to a mixture of refrigerants and/or lubricants for 30 days at 60° C. Polymeric materials include (i) polyetherimides, (ii) polyphenylene sulfides, (iii) polyketones, (iv) polysulfones, (v) liquid crystal polymers, and (vi) combinations thereof. Metal coatings on the polymers are the preferred embodiments for housings.

Abstract: The fluid transfer hand pump has a first chamber separated from a second chamber by a barrier with air passages. Air is drawn into the first chamber upon elevation of a knobbed rod. Air is forced into the second chamber by plunging the rod with a cupped seal into the first chamber. The second chamber is sealably joined to a fluid containing vessel to pressurize the vessel, which in turn forces fluid out of the pump and into a desired receptacle.

Abstract: A compressor may include a compressor body and a discharge valve assembly coupled to the compressor body. The discharge valve assembly directs discharge gas from the compressor body and between a valve plate and a valve retainer. The discharge valve assembly may include at least one reed valve assembly including a first support guide member, a second support guide member, and a reed assembly. The reed assembly may include a reed and a spring washer disposed between the first and the second support guide members.

Abstract: The invention relates to a diaphragm pump having a delivery space, which encloses a working volume, at least one deflectable diaphragm, which can be moved into a suction position and a pump position, an inlet valve arranged on a suction side of the diaphragm pump and an outlet valve arranged on the pressure side of the diaphragm pump. In order to make it possible to deliver fine-grain powder, for example, non-flowable powders having particle sizes of 0.01 ?m to 100 ?m, using a diaphragm pump, it is proposed that a gas feed for introducing a gas into the delivery space be arranged at the delivery space. In addition, the invention relates to a method for delivering fine-grain powder.

Abstract: A lubrication apparatus of a high pressure pump for a common rail system is configured such that a sufficient amount of lubrication fuel can be supplied from a low pressure pump to the frictional junction between a roller and a shoe within a short period of time, thereby efficiently improving the lubrication performance of the frictional junction.

Abstract: A refrigerant compressor configured to compress ethylene fluorohydrocarbon or a mixture containing the ethylene fluorohydrocarbon as a refrigerant, the refrigerant compressor including: a compression element configured to compress the refrigerant and including a sliding component that constitutes a sliding portion; and refrigerator oil configured to be supplied to the sliding component so as to lubricate the sliding portion, wherein a polymerization inhibitor configured to suppress polymerization of the refrigerant is contained in the refrigerator oil.

Abstract: Damage of a rotor and a side plate are suppressed with a simple construction to prevent reduction in durability of a vacuum pump. A casing manufacturing method comprises a step (step S2) of disposing a cylinder liner forming a cylinder chamber in a mold, and casting a casing main body integrally with the cylinder liner by using molten metal, and a step (step S3) of processing an intercommunication hole and an exhaust hole so that the intercommunication hole and the exhaust hole penetrate through both the cylinder liner and the casing main body together and intercommunicate with the cylinder chamber.

Abstract: A control valve for an oil-injected screw-type compressor, in particular for installation in a vehicle, wherein oil located in a screw-type compressor housing can be supplied in a controlled manner via the control valve to a heat exchanger and/or to a bypass in such a way that cold oil is conducted through a bypass around the heat exchanger and warm oil is conducted through the heat exchanger. A control valve is provided for an oil-injected screw-type compressor and ensures rapid heating of the oil in the screw-type compressor even with a short activation time. The control valve has a control piston that is actuated by a control element and cooperates respectively with a heat exchanger opening disposed in a control valve housing and a bypass opening, and that the control piston controls at least one bypass opening which cooperates with the heat exchanger opening.

Abstract: A submersible pump apparatus comprising a motor assembly, a pump assembly, and a plastic motor base. The motor assembly is either a canned motor assembly or a four inch motor assembly. The canned motor assembly is designed to prevent the immediate destruction of the submersible pump apparatus upon the occurrence of the breaching or leaking of the seals. The pump assembly is designed with either a single stage pump or double stage pump that utilizes a unique combination of propellers and intermediate flow straighteners, and driving mechanisms for the same. The plastic motor base is designed to accommodate attachment of either the canned motor assembly or the four inch motor assembly to the same pump assembly.

Abstract: A centrifugal compressor, including: a housing, the housing including: an inlet, a flow channel, an impeller outlet, and an air diffusing channel; a centrifugal impeller disposed inside the housing; a rotating wall, the rotating wall including a front cascade; and a rotating disc, the rotating disc including a rear cascade. The impeller outlet is disposed adjacent to a rear part of the centrifugal impeller and is connected to the flow channel via the air diffusing channel. The rotating wall is disposed between the centrifugal impeller and the housing. The front cascade is disposed inside the front part of the rotating wall and is connected to a dynamic driving device. The rotating disc is disposed inside the housing adjacent to the air diffusing channel and is in a rigid connection with the rotating wall.

Abstract: A livestock building design includes fans configured to provide an interior of the livestock building with a dissipation capacity of between 50 and 250.

Abstract: Exemplary methods and systems of determining stall of a fan are disclosed, when the fan is controlled with a frequency converter. The method includes estimating a rotational speed (n) and the torque (T) of the fan. Transferring characteristic curves of the fan to the estimated rotational speed (n) of the fan, determining the stall region of the fan. Determining an operation point of the fan from the estimated rotational speed (n) and estimated torque (T) using the characteristic curves. Calculating RMS values of the low frequency components of the torque and rotational speed estimates (TRMS, nRMS) to obtain a low frequency parameter (S), and determining an occurrence of stall based on at least one of the operation point and the low frequency parameter (S).

Abstract: A method for controlling air volume output by a motor. The method includes: 1) establishing functional relation formulas for air volume in a low torque interval and a high torque interval; 2) inputting a target air volume into a microprocessor control unit; 3) starting a motor under a torque to enable the motor to reach a steady state; 4) acquiring an adjustment coefficient under the torque, and calculating the air volume; 5) comparing the target air volume with the calculated air volume; 6) re-recording a steady rotational speed after the motor reaches a new steady state under an increased or reduced torque, and recalculating the air volume in the new steady state; and 7) repeating steps 5) and 6) to adjust the torque until the calculated air volume is equal or equivalent to the target air volume.

Abstract: Method for controlling a turbocompressor, whereby a compressed air line (5) is connected to this turbocompressor (1) with a non-return valve (6) provided therein, characterised in that, when one or several process parameters exceed a predetermined limit, the rotational speed of the turbocompressor (1) will be reduced very suddenly to a predetermined minimum rotational speed and the above-mentioned non-return valve (6) will be closed and in that, after the above-mentioned reduction of the rotational speed, when one or several gear-down conditions are fulfilled, the rotational speed of the compressor (1) will be increased again and the non-return valve (6) will be opened.

Abstract: A recirculation flow collector for a fan includes an arcuate housing; a first face with a first circular opening to receive flow; a second face with a second circular opening to allow flow in a normal fan operating condition; and an outlet in a bottom of the arcuate housing to allow recirculation flow.

Abstract: A non-metallic vertical turbine pump and a method of manufacturing same are provided. In accordance with one embodiment, the vertical turbine pump can include a motor, and a drive shaft coupled to the motor for rotation, a casing with a mixed flow diffuser including a diffuser hub and diffuser vanes that project out from the diffuser hub, and a mixed flow impeller configured to rotatably fit inside the casing, having an impeller hub, impeller vanes, extending from the hub, and a front and a back shroud connected to opposing ends of the impeller vanes. At least one of the mixed flow impeller and the mixed flow diffuser can be made of a non-metallic material and is a singular homogenous component.

Abstract: A liquid pump, in particular a water pump, comprises a pump housing, which has a thrust bearing seat, a bearing bolt and a bearing mounted on the bearing bolt. In this case, a thrust washer is arranged between the thrust bearing seat of the pump housing and the bearing. Furthermore, a flexible washer is arranged between the thrust bearing seat and the thrust washer.

Abstract: Some embodiments of the invention provide a pump including a pump chamber, a shaft at least partially positioned in the pump chamber, an impeller coupled to the shaft, and a seal coupled to the shaft. The pump also includes a wet seal chamber with a first fluid. The wet seal chamber can include a bladder that compresses to compensate for volumetric expansion of the first fluid. The wet seal chamber substantially prevents fluid from contacting the seal in order to prolong a life of the seal.

Abstract: A sealing system for a centrifugal compressor includes a stator having a seal, a seal disposed in the seal housing and having an abradable portion along an inner circumference, a rotor having a plurality of rotor teeth configured to rotate within the inner circumference of the seal and configured to create rub grooves within the abradable portion, and a first spring disposed between the stator and the seal and configured to facilitate axial movement of the seal relative to the seal housing.

Abstract: A rotary machine includes: a shaft that rotates; a disc that has a substantially cylindrical hub fitted into the shaft and is provided so as to widen outward in a radial direction from a front end to a rear end of the substantially cylindrical hub; and an impeller having a plurality of blades provided on a surface of the disc. The substantially cylindrical hub has a tight fit section having an internal radius that is smaller than a radius of the shaft, and a loose fit section having an internal radius that is greater than the internal radius of the tight fit section. The loose fit section is provided on a front end side of the substantially cylindrical hub with respect to the tight fit section.

Abstract: Disclosed is a cross-flow fan where an inner diameter (d) and an outer diameter (D) of a fan blade meet the relationship expressed by 0.55?d/D?0.95. In cross-flow fan, (N) representing number of fan blades, a chord length (L) and outer diameter (D) of fan blades, and (M) representing number of blade wheels meet the relationships expressed by of 0.6?L/(?D/N)?2.8 and 0.15??D/(N×M)?3.77. A plurality of blade wheels are stacked on each other in a manner that a displacement angle (?) is generated within the range of (1.2×360°/(N×M))???(360°/N) between adjacent blade wheels. The displacement angle (?) is set so that the overlapping number of fan blades having an equal installation angle is at most 5% of N×M representing a total number of fan blades. The present invention can provide a cross-flow fan that can succeed in noise reduction, a molding die used to produce the cross-flow fan, and a fluid feeder equipped with the cross-flow fan.

Abstract: A fan comprises a rotatable hub assembly having an inner anchor assembly, a plurality of fan blades, a motor assembly, and a plurality of cables. The outer ends of the cables are coupled to the outer ends of the fan blades, and the inner ends of the cables are coupled to the inner anchor assembly. The inner anchor assembly may further include a disc-shaped plate and a plurality of inner anchor members to which the cables may be coupled. The inner anchor members may include a rear anchor portion and fore anchor portion, and these anchor portions may be angularly offset. A plurality of winglets and/or outer anchor members may be coupled to the outer ends of the fan blades to which the outer ends of the cables may be coupled. The outer ends of the cables may further comprise swaged tips outboard of the winglets and/or outer anchor members.

Abstract: A turbo-molecular pump includes a case member, a rotor accommodated in the case member, the rotor having rotor blades arranged in multiple steps, a rotor shaft provided coaxially with the rotor, a plurality of stator blades provided on an inner surface of the case member and arranged between the rotor blades, and a plurality of spacers for supporting the stator blades. One of the plurality of spacers has a cooling thick portion for covering an outer peripheral side surface of at least one adjacent upper or lower spacer, and a cooling pipe through which a cooling medium is circulated is provided in the cooling thick portion.

Abstract: A heating and ventilation fan for a bathroom comprises an ventilation fan frame, a scroll casing provided with fan blades and a motor, an air passage-switching plate, and a heater; characterized in that: an air leakage-preventing structure is provided between an air outlet of the scroll casing and the air passage. The advantage of the present invention is that a desired air amount can be ensured and a noise can be reduced while guaranteeing a gap required for smooth rotation of the air passage-switching plate.

Abstract: A fan guard for a condenser unit of an air conditioner which supports the fan motor made of wire formed into a plurality of concentric rings or rectangles, or a spiral, secured to a spaced plurality of first radially-oriented elements each having at its peripherally-positioned end an orifice for fastening the guard to the unit and to an interspaced plurality of second radially-oriented elements each having at its end, closest to the fan guard's center, an orifice for fastening the motor to the guard, a third element extending all across the guard, and a sturdy ring affixed to at least the first and second elements proximate to the center. The guard preferably is convex whose wire elements have an elongated cross-sectional shape with lower airflow resistance. The fan guard has low fabrication and materials costs and allows use of motors with lower energy consumption for the same airflow efficiency.

Abstract: An actuator, including a cylinder, an actuator piston displacably arranged in the cylinder, a pressure fluid circuit having a channel mouthing in the cylinder, an indirectly electrically controlled first valve body, arranged in the channel for controlling a flow of a pressure fluid in the channel, and a second valve body, arranged in or at the channel to open and close the channel, the second valve body being a member fixedly connected to the actuator piston, and the first valve body and the second valve body being arranged in series with each other in the channel. The actuator further includes an electrically controlled three-way valve that is arranged to alternately open for a pressure fluid flow from a high pressure source and a pressure fluid flow from a low pressure source, chosen pressure fluid flow being arranged to act against and admit displacement of the first valve body.

Abstract: A method of controlling a flow rate of an attachment for construction equipment of the present disclosure, in which an engine and a pump are connected to a control device to which various control information according to equipment characteristics, user setting information from an instrument panel, engine rpm adjustment information through an engine control dial, or the like is inputted, and an attachment is connected to the pump so as to perform specific work, includes selecting, on the instrument panel, an attachment to perform work and an optimum engine rpm according to the attachment; adjusting the flow rate by controlling an angle of a swash plate of the pump; and adjusting additionally a supply flow rate of the attachment by resetting an engine rpm when adjustment to the flow rate is necessary while performing the attachment work.

Abstract: A panel hook (1) designed for hooking a panel to be connected to the panel hock to a carrier, such as a rail, the panel hock comprising a strip (2) provided with a part (5) of I-shaped cross-section that is integral therewith, which part comprises a first flange (6), which races the strip, and a second flange (7), which forms a guide for a slide, wherein the slide engages round the second flange and comprises a hook-shaped element (15), wherein the l-shaped part comprises a profile between the flanges, and wherein the slide comprises at least, one projection (11) which engages the profile of the l-shaped part so as to prevent the slide from being moved in a first direction (13) along the second flange, whilst movement of the slide in an opposite, second direction (12) along the second flange is possible, a special feature being the fact that the panel hook further comprises a second slide (3) provided with a hook-shaped element (14), which second slide engages around the second flange, wherein the second slid

Abstract: Floor panels with a flexible tongue in an insertion groove, the flexible tongue is designed to cooperate, in a connected state with a tongue groove of another panel, the panels are adapted to be locked together by vertical folding, the flexible tongue has a projection portion which, in a connected state projects outside the insertion groove and cooperates with the tongue groove, said projecting portion has a beveled and/or rounded sliding surface and the panels have a sliding surface adapted to cooperate therewith during vertical folding, the flexible tongue during the vertical folding is displaced twice in the horizontal direction, a first displacement is effected by the vertical folding of the fold panel whereby at least a part of the flexible tongue is bent, a second displacement of the flexible tongue towards its initial position is accomplished substantially by a spring effect caused by said bending of said flexible tongue.