Abstract: A field configurable vehicle armoring system and associated method allow a user to retrofit and reconfigure a combination of armor components in response to a perceived threat change and using original equipment manufacture fasteners and holes. The system includes pillar armor attachable after an original equipment manufacture door and hinge are removed. Fasteners extend through the hinge of the armored door, the pillar armor and an original equipment manufacture pillar using holes other than the original equipment manufacture holes. Rocker panel and underbody armor is further provided, along with a ballistic resistant windscreen and rear wall armor. Where desired, system armor includes a composite plate comprising a strike face that is constructed from softer metallic material than an inner metallic sheet.

Abstract: A valve device and method for the activation of an actuating drive, which can be acted upon with a pressure medium by a position controller. The position controller can be acted upon by a working connection of the actuating drive with a pressure medium which can be delivered to the position controller via a feed pressure connection. The valve device includes means for blocking the actuating drive in the event of a failure of the feed pressure. The blocking means includes a pilot-controlled shut-off valve which is arranged in the region of the working connection of the position controller, and a pilot control valve arrangement connected to the feed pressure connection of the position controller to control pressure of the feed pressure connection and cause the pilot-controlled shut-off valve to assume a shut-off position when the feed pressure falls below a defined first limit value.

Abstract: Adjusting device which has a main cylinder (2) and a spring cylinder (3) arranged separately therefrom, wherein, during a pressure drop, the spring force acts hydraulically on the main cylinder (2). In order to design such an adjusting device more effectively, the effective spring piston area is variable.

Abstract: A diaphragm for a pressure-medium-actuated brake cylinder includes a radially outer fastening edge for fixing the diaphragm to the brake cylinder. At least one centering ring, which extends in an axial direction and is offset radially inward in relation to the fastening edge, is formed on the diaphragm. Via the centering ring, the diaphragm can be centered against a radially inner peripheral surface of a wall of the brake cylinder.

Abstract: A method for producing a piston of an internal combustion engine in which a first blank and at least one additional black are provided with a somewhat cylindrical shape. The blanks are joined together, and the obtained piston blank is subjected to a shaping process in which a combustion chamber cavity of the piston is formed in the area of a joining point between the first and the second blank. The material of the second blank forms a reinforcement for at least the combustion chamber cavity.

Abstract: A method of controlling the dust particle emission from an electrostatic precipitator (1), which has a first and a second bus-section (16, 20), comprises observing that a rapping event of the first bus-section (16) is about to be initiated, verifying, before allowing the rapping event of said first bus-section (16) to be initiated, that the second bus-section (20), which is located downstream of said first bus-section (16) with respect to the flow direction of the flue gas in said electrostatic precipitator (1), is ready to receive the dust particles to be released during the rapping event of said first bus-section (16), and initiating, after said verification, said rapping event of said first bus-section (16).

Abstract: A method of controlling the rapping of at least one collecting electrode plate (30) of an electrostatic precipitator (1) comprises applying, by means of a power source (32), a voltage between said at least one collecting electrode plate (30) and at least one discharge electrode (28), measuring the sparking rate between said at least one collecting electrode plate (30) and said at least one discharge electrode (28), and controlling, using the measured present sparking rate, the rapping of said at least one collecting electrode plate (30).

Abstract: A method and to a device for the regeneration of a particle arranged in the exhaust gas train of an internal combustion engine. An exhaust gas stream to be cleaned is supplied to the at least one particle filter. At least in a regeneration mode, a predetermined amount of an exhaust gas stream to be heated is branched off from the exhaust gas stream upstream of an exhaust gas turbine of an exhaust gas turbocharger which branched-off stream, after it has been heated by a heater is mixed in the form of a heated exhaust gas stream at a point upstream of the at least one particle filter back into the residual gas stream which is coming from the exhaust gas turbine and which is at a lower temperature than that of the other stream.

Abstract: A control system and associated methods for an air treatment system. In one aspect, the present invention provides a control system and method for controlling blower speed as a function of separately determined smoke and dust concentrations. In one embodiment, the control system and method provides a variable delayed between changes in motor speed to address undesirable rapid changes between speeds. In another aspect, the present invention provides a system and method for calibrating a sensor to provide more uniform operation over time. In yet another aspect, the present invention provide a system and method for calibrating motor speed to provide more consistent and uniform motor speed over time. The present invention also provides a system and method for tracking filter life by as a function of time, motor speed and/or a sensed variable, such as particulate concentration in the environment.

Abstract: Various embodiments of the present disclosure provide an inertial separation device, system, and method. The inertial separation device includes an inlet nozzle coupled to an expansion chamber. A sample outlet and an outlet port are coupled to the expansion chamber. In operation, a fluid sample passes though the inlet nozzle and is expanded in the expansion chamber such that the sample is separated into at least two fractions having different masses, a selected mass fraction passing through the sample outlet and a remaining portion of the sample passing out of the outlet port. A system including the inertial separation device includes a conduit coupled to the sample outlet nozzle and a detector coupled the conduit. The inlet nozzle may be, for example, coupled to an emissions source.

Abstract: The present invention relates to a method and a plant for CO2 enrichment of a CO2 containing gas, such as an exhaust gas from an industrial plant or a thermal power plant, by means of serially connected centrifuges of cyclones. Enrichment of CO2 reduces the volume of the exhaust gas, increases the partial pressure of CO2 therein and makes a less expensive and more effective capture of CO2 possible. The invention also relates to plants for carrying out the method.

Abstract: The present invention is a biogas processing system having a compressor having a biogas input and output, a pump having a water input and output, a scrubber tower having a mixing chamber connected to a biogas input, a water pump input, a water output, and a processed biogas output, and a filtration member connected to the water output to remove contaminants from the water exiting the first scrubber tower. The system also includes devices for heating and cooling the recycled flow of water to enhance the ability of the water to absorb contaminants from the biogas and the ability of a stripper to remove absorbed contaminants from the water in a closed loop water system, and a controller for closely controlling the operating parameters of the system to achieve safe an optimal operation of the system.

Abstract: A process and system for removing polar components from a process stream in a refinery process without cooling the process stream are disclosed. The process stream is fed to a first adsorber unit to remove contaminants containing sulfur from the process stream. The process stream is processed within the first adsorber unit to remove sulfur containing contaminants. The process stream is processed with the first adsorber unit at substantially the same elevated temperature. The process stream is processed within the first adsorber unit by exposing the process stream to at least one of a metal oxide and a mixed metal oxide to remove the sulfur containing contaminants from the process stream and produce a metal sulfide and a desulfurized process stream. The metal sulfide may be exposed to a stream of oxygen to regenerate the at least one of a metal oxide and a mixed metal oxide.

Abstract: A process for the abatement of carbonyl sulphide, carbon disulphide, metal carbonyl compounds, hydrogen sulphide and hydrogen cyanide, ammonia and arsenic and chlorine compounds from a feed gas comprising the steps of contacting the gas in succession with a first purification agent comprising activated carbon, with a second purification agent comprising alumina, with a third purification agent comprising zinc oxide, with a fourth purification agent comprising a zeolitic material and a fifth purification agent comprising zinc oxide and copper oxide.

Abstract: An acid gas absorbent comprising an alkylamino alkyloxy (alcohol) monoalkyl ether and a process for the selective removal Of H2S from gaseous mixtures containing H2S and CO2 using an absorbent solution comprising an alkylamino alkyloxy alcohol monoalkyl ether.

Abstract: Air or gas cleaners enhance the uniformity of the current density between an emitter and one or more receptor electrodes by positioning one or more insulators or effective resistors between the emitter and the receptor electrode. Insulators and/or effective resistors are used to shield select portions, e.g. the edges of plate-type receptor electrodes, from ionization current flowing between an emitter and unshielded portions. This allows more compact structures without ionization current concentrations at the shielded regions, and results in lower ozone generation for a given particle collection efficiency.

Abstract: An embodiment of the present invention measures a sample of the airstream, in real time, for at least one corrosive, before the airstream enters the compressor. An embodiment of the present invention may then initiate an on-line water wash system to reduce the level of the at least one corrosive on the compressor. An embodiment of the present invention also provides an on-line water wash system that may mix a cleaning fluid with at least one chemical agent to form a cleaning solution. The cleaning solution reduces the corrosives on components of a turbomachine compressor. The cleaning solution may be an acidic solution to reduce corrosion of a caustic nature. Alternatively, the cleaning solution may be a basic solution to reduce corrosion of an acidic nature.

Abstract: The grinding member for a device for grinding coffee comprises a grinder (9) with a grinding surface, forming a single co-molded block with a support (7) made of plastic material.

Abstract: The infusion device comprises an infusion chamber with a first portion (5) and a second portion (3), movable with respect to each other, and one of which defining a seat (25) for the capsules (C). In the seat there is disposed at least one perforator (27) to perforate the capsule. A first duct (47) feeds an infusion fluid into the chamber and a second duct (29) allows delivery of the food product from the infusion chamber. In said seat (25) there is housed a centering member (40) of the capsules (C), elastically movable in an axial direction and provided with a guide and centering surface (40A) of the capsules, facing towards the second of said portions of the infusion chamber.

Abstract: Disclosed is a lid (100), in particular for a disposable cup. The lid comprises an infusion chamber (110) having at least one water-permeable wall (111) and comprising an infusible substance; a flange (120) for attaching the lid to the rim (210) of a cup (200); and a body section (130) comprising a moveable portion (135). The infusion chamber (110) is attached to the moveable portion (135) and with the lid (100) fitted to the cup (200), the moveable portion (135) is reversibly translatable between a raised and a lowered position in a direction (A) substantially perpendicular to the plane of the rim (210).

Abstract: Disclosed is an attachment (100) for a cup (200) having a body (210), a base (220) and a mouth (230) delimited by a rim (240). The attachment comprises a chamber (110) for holding an infusion bag (300) and comprising a wall (111) delimiting a cavity (112) for receiving the infusion bag (300) and a mouth (113) for allowing the infusion bag (300) to pass into the cavity (112). The attachment further comprises an element (120) for suspending the chamber (110) within the cup (200) such that at least a portion of the mouth (113) of the chamber (110) is below the rim (240) of the cup (200). The element (120) and chamber (110) are arranged such that when the chamber (110) is suspended in the cup (200), liquid (400) cannot pass between the cup and the chamber when the cup is substantially full.

Abstract: The present invention relates to a food fryer for frying a food in oil, comprising a heating element, a housing, an oil section, a conveyor section, a food basket, a spinning section with a spinner for spinning said food basket, and wherein the oil section, the conveyor system, and the spinning section are disposed within the housing, and wherein the heating element, the housing, the oil section, the conveyor system, and the spinning section are interoperable to maintain a C of less than 50° C. per minute.

Abstract: A barbecue stove includes a body, a cover, a storage device, two primary feet and two secondary feet. The cover is pivotally connected to the body. The storage device is attached to the body. The primary feet are attached to the body. The secondary feet are attached to the storage device. The barbecue stove lies on the primary feet in use and stands on the secondary feet in storage.

Abstract: The invention relates to an apparatus for applying oscillating magnetic fields, particularly for treating liquid, pasty, semi-solid or granular products, to a method of use of such apparatus, and to a system incorporating it. The apparatus comprises at least one pipe of an electrically insulating material for conveying the products to be treated, at least one plurality of electrodes around the periphery of the pipe, and means for generating one high frequency oscillating electric voltage. Each of the electrodes has a substantially annular shape, with an inner surface having a minimum radial distance from the outer cylindrical surface of the at least one pipe, which is sufficient to prevent electric currents from passing to the product to be treated. The inner surface has at least one substantially conical edge with a predetermined conicity angle to allow use of relatively high voltages with no risk of discharges to air.

Abstract: A device for eliminating vacuum as the plunger is returned by venting it to the atmosphere in a patty molding machine.

Abstract: A frozen drink maker is provided having an ice shaving unit with a rotatable ice chute. A plurality of blender units are positioned about the ice shaving unit, each having a removable blender jar for receiving shaved ice therein. A programmable controller is operably connected to the ice shaving unit and each of the blender units for controlling the operation of the ice shaving unit and the blender units. The programmable controller includes a plurality of preprogrammed routines to make a plurality of different frozen drink, wherein the programmable controller can be selectively set to make one of the plurality of frozen drink in each of the blender jars.

Abstract: A rotary food cutting device is provided. The rotary food cutting device comprises a handle assembly and a removable blade assembly. The removable blade assembly has a blade, a first blade mounting member, and a second blade mounting member. The blade is positioned between the first blade mounting member and the second blade mounting member. The first blade mounting member and the second blade mounting member interact with the handle assembly to removably secure the blade.

Abstract: A system for extracting liquid from a mass comprising a portable platform having an upper surface, a system mass input, a polymer feeding and blending system on the upper surface, a liquid extraction assembly on the upper surface, and piping having a first section between the system mass input and the polymer feeding and blending system, and a second section between the polymer feeding and blending system and the liquid extraction assembly. The system is configured to have mass inputted into the system mass input, transport the mass to the polymer feeding and blending system through the first section of the piping, inject polymer into the mass in the polymer feeding and blending system, and transport the mass from the polymer feeding and blending system to the liquid extraction assembly. Pressure from mass forced into the liquid extraction assembly forces liquid in the mass to exit the mass.

Abstract: In a sheet-fed printing press including; an impression cylinder gear driven by an upstream drive motor of an upstream printing unit group; an impression cylinder rotationally driven by the impression cylinder gear; a transfer cylinder gear of a convertible press mechanism rotationally driven by the upstream drive motor through the impression cylinder; and a transfer cylinder which is provided with a notch and is rotationally driven by the transfer cylinder gear, a load motor is provided to the transfer cylinder or the transfer cylinder gear, and braking force of the load motor is controlled according to load on the upstream drive motor.

Abstract: In a printing press including; a blanket cylinder gear driven by a drive motor of the printing press; a blanket cylinder including a notch, the blanket cylinder being rotationally driven by the blanket cylinder gear; a plate cylinder gear rotationally driven by the drive motor of the printing press through the blanket cylinder gear; and a plate cylinder including a notch at a position corresponding to the notch of the blanket cylinder, the plate cylinder being rotationally driven by the plate cylinder gear, a load motor is provided to the plate cylinder or the plate cylinder gear, and a braking force of the load motor is controlled according to load applied to the drive motor of the printing press.

Abstract: A method for making a lithographic printing plate including the steps of providing a lithographic printing plate precursor including a heat sensitive image-recording layer, the image-recording layer including hydrophobic thermoplastic particles; image-wise exposing the precursor to infrared radiation having an energy density of 190 mJ/cm2 or less; mounting the exposed precursor on a printing press; developing the mounted precursor by supplying ink and/or fountain; and baking the plate by keeping the plate at a temperature above the glass transition temperature of the thermoplastic particles during a period between 5 seconds and 2 minutes.

Abstract: Transportation of a lithographic plate uses an indexer to load plates into pods for delivery to a press cylinder via a pod elevator or a pod cart. The plates are imprinted with a bar code, imaged, punched, bent, sheared, corner notched, and registered to a press cylinder. The plates are loaded into the indexer, which moves the loaded plates into a position in alignment with designated pod compartments, and loads the plates into each of the designated pod compartments by indexed movement of an elevator within the indexer. The pod elevator or the pod cart moves the pods proximate to a press cylinder where the plates are unloaded from the pod and loaded onto a press cylinder. A computing device, such as a PLC, directs the process. A vision system senses information from the indexer, pod, pod elevator, and the plate for feedback to a PLC, which initiates all of the foregoing operations.

Abstract: The velocity of detonation of an explosive such as detonating cord (18, 22) is controlled by the addition of a diluent to the explosive, e.g., to the core of the detonating cord (18, 22). An explosively inert diluent, or a diluent comprised of an explosive of lower brisance than the principal explosive comprising the core of the detonating cord, will serve to reduce the velocity of detonation. Such reduced velocity of detonation has beneficial effects in certain operations, including cleaving rock (10), wherein it is observed to significantly reduce radial cracks (24) and stickers (26) (long radial cracks) in the vicinity of the boreholes (12) in which the low-velocity detonating cord (18, 22) is functioned to cleave the rock (10). The low-velocity detonating cord also facilitates leaving behind a smoother face in cutting trenches and tunnels through rock.

Abstract: The invention includes a number of shotgun shells having colored projectiles. When each shooter in a party of shooters utilize shotgun shells which have a projectiles of a color which is uniquely distinctive to that shooter then one is able to determine, by post-shooting inspection of an animate or inanimate target which was fired at by multiple shooters of said party, which of said shooters actually struck the target, how many times and at what place on said target The invention is therefore useful in accurately crediting each shooter for the accuracy of their shooting.

Abstract: The invention relates to a railroad tie manufactured from plastic (2), wherein at least two steel bars (3) are embedded in the plastic and wherein the steel bars extend in longitudinal direction of the plastic railroad tie (1) and wherein specimens of the bars (3) situated in operative condition at different heights in the railroad tie are free from mutual connections other than by the plastic. The plastic (2) is Low Density Polyethylene.

Abstract: A magnetic polar arrangement which is intended for magnetic levitation vehicles is described, the magnetic polar arrangement having at least one magnetic pole (22) with a core (6) which defines a magnetic pole surface (23), and with a winding (5) which is set back with respect to the magnetic pole surface (23) in order to form a free space (24). The magnetic pole (22) is provided with a sensor which contains a sensor head (9a), which is arranged at least partially in the free space (24), and an electronic module (9b). According to the invention the sensor head (9a) is physically separated from the electronic module (9b) and is combined, at least with the core (6), to form a single-piece structural unit which is surrounded by a common anti-corrosion layer (26).

Abstract: An auto rack rail road freight car is provided for carrying low density, relatively high value, relatively fragile lading. The car employs wheels that are greater than 33 inches in diameter.

Abstract: A rail car cover system including a rail car, a first cover section and a second cover section. The rail car has an opening. The first cover section is operably attached to the rail car. The first cover section includes a first hinge mechanism and a first cover material. The second cover section is operably attached to the rail car. The second cover section includes a second hinge mechanism and a second cover material. The first cover section and the second cover section are both movable between a closed configuration and an open configuration. When in the closed configuration, the first cover section and the second cover section substantially cover the opening.

Abstract: The invention is directed to a lamination fluid useful in processes for wet laminating a photopolymerizable film onto circuit board panels or other substrates. The lamination system comprises 1) a dry film photoresist, 2) a laminate comprising i) copper ii) stainless steel iii) non metal on a surface, 3) a lamination fluid and 4) fluid application device on the laminates. The lamination fluid comprises water and a surface energy modification agent. The surface energy modification agent is present in a range between 0.0001 and 3.0 moles/liter, and the pH of the fluid is between 3 and 11.

Abstract: Stable, aqueous dispersion containing silicon dioxide powder having a hydroxyl group density of 2.5 to 4.7 OH/nm2, which is obtained from a silicon dioxide powder produced by a flame hydrolysis process under acid conditions. The dispersion is produced by incorporating the silicon dioxide powder into an aqueous solution by means of a dispersing device. The dispersion can be used to produce glass articles.

Abstract: There is provided a method for producing an elongated-shaped silica sol comprising the following steps: (a) adding an aqueous solution containing a water soluble Ca salt and/or Mg salt to an aqueous colloidal solution of active silicic acid with an SiO2 concentration of 1 to 6% by mass and a pH of 2 to 5 in a mass ratio of CaO and/or MgO to SiO2 in the active silicic acid of 1500 to 15,000 ppm, and mixing; (b) adding alkali metal hydroxide, a water soluble organic base, or water soluble silicate thereof to an aqueous solution obtained through (a) in a determined molar ratio to SiO2, and mixing; (c) heating a mixture obtained through (b) at 85 to 200° C. for 0.5 to 20 hours so as to obtain a colloidal solution; (d) removing, from the colloidal solution obtained through (c), part of water and at least part of anions derived from the aqueous solution containing the water soluble Ca salt and/or Mg salt; and (e) heating a colloidal solution obtained through (d) at a temperature of 80 to 195° C.

Abstract: A process for manufacturing concrete bodies at elevated temperatures including the steps of providing pre-selected amounts of cement, aggregate and water where the temperature of at least the aggregate and more likely the cement and water are heated to a temperature between about 32° C. and 45° C. The heated amounts of cement, aggregate and water are mixed at an elevated temperature within the aforementioned range and a set retarding, water reducing admixture added. The mixing is continued and the hot mixture including the set retarding, water reducing admixture is cast at an elevated temperature within the same range to provide a concrete body form or structure with improved short and long-term compressive strengths.

Abstract: A method for manufacturing concrete bodies or forms containing electric arc furnace dust in an amount of up to about 4% at elevated temperatures to provide concrete bodies is disclosed. The concrete bodies have improved compressive strength and slump retention capability. The method for producing the bodies includes the steps of providing pre-selected amounts of electric arc furnace dust, water, cement and aggregate. The electric arc furnace dust is mixed with water and then added to the cement and aggregate and mixed together at a temperature of about 32° C. and 45° C. to form a hot mixture. The hot mixture is added to a mold and cast at an elevated temperature to form a body with improved strength and slump retention characteristics.

Abstract: The invention provides a process for the production of cement which comprises the calcination of calcium carbonate-containing raw meal in a calciner heated by combustion of a carbon-containing fuel with a gas comprising oxygen and from 0 to 80% by volume of carbon dioxide, and substantially free of nitrogen, and isolating the gas produced by combustion and calcination in the calciner.

Abstract: A method of and an apparatus for controlling the temperature of a fluidized bed reactor, comprising a separator for separating first solid particles from the fluidized bed reactor, a return duct for returning a first portion of the first solid particles to the fluidized bed reactor, a discharge duct for the discharge of a second portion of the first solid particles and an inlet duct for transferring second solid particles from a second fluidized bed reactor to the fluidized bed reactor, in which the return duct and the inlet duct share a common end portion for transferring a mixture of solid particles, formed of the first portion of the first solid particles and the second solid particles, to the fluidized bed reactor. The apparatus also preferably includes a fluidized mixing device for mixing the first portion of the solid particles and the second solid particles with each other.

Abstract: A combustion chamber (10) for burning solid fuels having a high volatiles content has a hollow body (11) with a cylindrical wall section (12) and a top section (13) located at end (14) of the cylindrical wall section (12). The hollow body (11) has a primary air inlet (20), a fuel inlet (23) and four volatiles outlets (25) (one shown), mounted therein. Each volatiles outlet (25) has a plurality of apertures (26) of differing sizes arranged in a plate (27). In use, the burning volatiles exit the apertures (26) in a turbulent flow resulting in efficient combustion of the volatiles. Additionally, a heat transferring surface (33) on a water jacket (32) is shaped around the combustion chamber (10) so as to define a channel (34) there between. This arrangement results in an efficient transfer of heat from the turbulent flow of volatiles, which is forced to circulate around the channel (34).

Abstract: A method of seed planting in a “serpentine” pattern called the wave planter is demonstrated. It consists of a means that essentially results in equally spaced rows placed in a serpentine-like layout or wave instead of a straight row. The preferred method creates a wave pattern equidistant from the next, yet creates a substantial increase over the density of straight row planting devices and drills (eg parallel, essentially straight rows). The use of the wave pattern provide concrete and substantial benefits to the business and economics of farming through labor, energy, and maintenance savings over current planting methods which results in a new farming business method. The method may be accomplished by several devices. Some of the devices include an oscillating draw Bar planter; oscillating tongue planter; elliptical row opener; steerable undercarriage for the planter and castor row openers under undercarriage.

Abstract: A system comprising a floating structure, the structure subject to waves and/or water currents; and at least one motion suppression system attached to the floating structure; the motion suppression system comprising a first oscillating water column tuned to a first frequency and a second oscillating water column tuned to a second frequency.

Abstract: The rudder arrangement for ships comprises a twisted balanced rudder blade having a slender profile and having a low profile thickness and comprising a propeller facing the rudder blade and a rudder pipe located in the upper region of the rudder blade with rudder post located therein, wherein the rudder blade comprises two superposed rudder blade sections having different heights whose front nose strips facing the propeller are offset in such a manner that one nose strip is offset to port or starboard and the other nose strip is offset to starboard or port, wherein the two side wall surfaces of the rudder blade converge into an end strip facing away from the propeller and have different arc profiles.

Abstract: The present invention relates to a water craft (10) having two spaced hulls (18, 20) and a tunnel (22) defined therebetween. The water craft (10) is provided with a hydrofoil section (38) extending between the hulls (18, 20) and across the tunnel (22). The tunnel facing side of each hull (18, 20) is provided with a recess (50) which extends from a position rearward of the bow (24) of the water craft (10) to the stern (26) of the water craft (10). Each recess (50) includes a side wall (52) which extends upwardly from the keel line of each hull (18, 20) and an upper wall (56) which is inclined downwardly in the direction of the stern (26). Each recess (50) is further provided at a rearward portion thereof with a skirt (58) positioned inboard of the side wall (52) so as to define an open sided channel between the skirt (58), sidewall (52) and downwardly inclined upper wall (56) of the recess (50).