Abstract: An electrical power generation system comprises a vertical axis solar powered generator having a bottom side grounded and a top side connected to a vertical rotor shaft, a central rotating hub having a center connected to the vertical rotor shaft, a solar energy collecting and converting unit enclosed in a transparent dome mounted on a top side of the central rotating hub, and a plurality of rotating arms having a proximal end secured to the central rotating hub and a distal end connected to a dual-V roller bearing. The system further comprises an electric motor with a propeller mounted proximate to the distal end of rotating arms, a shroud attached to ground, and a pair of hollow tubes attached to the shroud. Solar energy collecting and converting unit provides electric energy to electric motor which turns the propeller and rotates the rotating arms thereby causing electric energy generation by generator.

Abstract: A system and method for converting solar energy into mechanical and electrical energy is described. This method is based on the phase change of a material due to temperature. The change of phase is accompanied with displacement at high forces that can easily be converted into useful mechanical and electrical power.

Abstract: A solar collector is provided with a reflective panel assembly that is supported by a frame and pivots about a first horizontal axis. The panel assembly is configured for reflecting sunlight to a common focal point, and includes a central panel and a pair of outer panels each pivotally coupled to the central panel and configured for folding over the central panel. A collector assembly is mounted relative to the frame and pivotal about a second horizontal axis. The collector assembly is configured for collecting solar energy and includes a receiver that is positioned at the focal point. The receiver is configured for extracting energy from the reflected sunlight. The solar collector may also include a four-bar linkage assembly for supporting the panel assembly and the collector assembly during movement from a collapsed position and a partially extended position.

Abstract: A steam power unit including a double-flow medium pressure turbine section that is fluidically connected to a low pressure turbine section is provided. A flow section of the medium pressure turbine section is configured to supply an external steam consumer. A throttle valve for adjusting the pressure in the steam extraction line is arranged only in a turbine discharge line.

Abstract: A method for operating an internal combustion engine (10) having a steam power plant (12), in which the exhaust gas of the internal combustion engine (10) at least indirectly heats the steam and this steam drives a turbine (26), the steam power plant (12) being sometimes, in particular at the beginning of operation, initially operated in a protection operating mode, in which the protection of the turbine (26) from damage by water droplets has priority.

Abstract: A transition duct (94) for routing a gas flow from a combustor to the first stage of a turbine section in a combustion turbine engine is disclosed. The transition duct (94) may have an internal passage (102) extending between an inlet (98) to an outlet (100). An axis (130) of the transition duct body (96) may be generally linear such that gases expelled from the transition duct body (96) flow in a proper direction into the downstream turbine blades.

Abstract: The system may include a turbine engine. The turbine engine may include a fuel nozzle. The fuel nozzle may include an air path. The fuel nozzle may also include a fuel path such that the fuel nozzle is in communication with a combustion zone of the turbine engine. Furthermore, the fuel nozzle may include a resonator. The resonator may be disposed in the fuel nozzle directly adjacent to the combustion zone.

Abstract: A Helmholtz damper for a combustor of a gas turbine includes first and second damping volumes. The combustor has a combustion chamber disposed in a housing and closed off by a front plate at which a plurality of burners are exchangeably fastened. The burners are supplied with fuel via fuel lances which extend from outside the housing through a bushing of the housing to the associated burner. The first damping volume has a first end and a second end, the first end of the first damping volume being configured to attach a connecting passage extending to a front panel such that the Helmholtz damper is connectable with the front plate of the combustion chamber in place of one of the burners. The second damping volume has a first end and a second end and is arranged in series with the first damping volume along an axis of the Helmholtz damper with the first end of the second damping volume being detachably connected to the second end of the first damping volume so as to form a combined larger damping volume.

Abstract: A burner and a method for operating a burner are provided. The burner includes a channel having a mixing zone and having a feed for an oxidation means, particularly an air feed, and at least one fuel feed for injecting fuel, wherein a separating means which divides the channel over a wide range of the channel into at least two separated channels, namely a first channel and a second channel, is provided in the channel. The method for operating a burner having a channel includes a mixing zone into which an oxidation mass flow and fuel are injected, wherein two substantially separate flow paths are formed by means of a separating means in the channel and the at least two separated first and second channels, formed by the separating means.

Abstract: A turbomachine including an annular combustion chamber, a sectorized turbine nozzle arranged at an outlet from the chamber, and a sealing mechanism interposed axially between the chamber and the nozzle, the sealing mechanism including an annular gasket that is axially resilient. The gasket includes a first axial bearing mechanism for bearing against a downstream end of the chamber and a downstream annular lip that is sectorized, each sector of the downstream lip being in alignment with a sector of the nozzle and including a second axial bearing mechanism for bearing against an upstream end of the nozzle sector.

Abstract: The present invention provides methods and system for power generation using a high efficiency combustor in combination with a CO2 circulating fluid. The methods and systems advantageously can make use of a low pressure ratio power turbine and an economizer heat exchanger in specific embodiments. Additional low grade heat from an external source can be used to provide part of an amount of heat needed for heating the recycle CO2 circulating fluid. Fuel derived CO2 can be captured and delivered at pipeline pressure. Other impurities can be captured.

Abstract: A gas turbine (1) includes a compressor (2) that feeds an oxidizer to one or more combustion devices (3, 5) in which fuel is injected and is combusted to generate hot gases that are expanded in a turbine (4, 6). The flue gases discharged from the turbine (4, 6) are partially recirculated into the compressor (2). The fuel is a gaseous fuel that is injected into the combustion devices (3, 5) via two or more stages (20, 22, 23). One of the stages is a pilot stage (20) in which the fuel is injected along a longitudinal axis (21) of the combustion device (3, 5) or an axis parallel thereto.

Abstract: In one aspect, an embodiment of the present disclosure provides an Integrated Gasification Combined Cycle (IGCC) apparatus. The apparatus includes a saturator configured to saturate NPG with water vapor, and a heat recovery steam generator (HRSG), a low pressure steam loop through the saturator, wherein the HRSG is configured to heat the low pressure steam loop. The apparatus further includes a compressor and a heat exchanger configured to heat the NPG using waste process heat and extraction air from the compressor, wherein the heated NPG thereby becomes diluent nitrogen.

Abstract: A system and method for startup control of a gas turbine is disclosed. The system and method includes defining a target startup time for the startup of the gas turbine and determining a remaining time to achieve the target startup time. The system and method includes monitoring at least one parameter associated with the startup and determining a first operating point for the parameter. The system and method adjusts the first operating point for the parameter to a second operating point based at least in part on the remaining time for the startup. The system and method controls an effector based on the second operating point for the parameter.

Abstract: The present subject matter provides a system for modifying static pressure recoveries and emissions formation within a gas turbine. The system includes a bled diffuser positioned downstream from a compressor section of the gas turbine and a bleed duct extending from the bled diffuser. The bleed duct may be configured to direct bleed air from the pressurized airflow exiting the compressor section to a secondary combustion system located downstream from the main combustion system in a combustor. The bleed air flowing into the secondary combustion system may be mixed with fuel to form an air/fuel mixture.

Abstract: A turbo machine is provided that includes a turbine nozzle having a wall. The wall provides spaced apart first and second surfaces. A combustor includes a liner having an annular lip that engages one of the first and second surfaces. A floating ring seal is supported by the liner in a slip-fit relationship, for example, using a retainer. The floating ring seal engages the other of the first and second surfaces. The floating ring seal is slidably moveable relative to the liner in a floating direction in response to movement of the liner in a radial direction.

Abstract: A rotor containment structure for gas turbine engine comprises an inner containment layer having a single integral body defining an annular structure about the rotor, and having a support on the inner surface of the inner containment layer for at least one shroud segment. An outer containment layer provides containment strength to contain blade fragments and defining an annular structure about the inner containment layer. Air passage through the outer containment layer for air to pass from an exterior of the outer containment layer to an interior of the outer containment layer; and the inner containment layer being connected at a first end to the outer containment layer with a gap defined between the inner surface of the outer containment layer and the outer surface of the inner containment layer, the gap being in fluid communication with the air passage such that air flows through the gap, beyond a free second end of the inner containment layer.

Abstract: Disclosed is a cooling apparatus including: a heat receiving plate to which a plurality of heating elements are attached; a radiator plate to which a plurality of Peltier devices are attached; a thermal transport heat pipe that couples the heat receiving plate with the radiator plate; and a heat dissipating device being provided on an exothermic side of the Peltier devices; wherein the plurality of heating elements are arranged along a longitudinal direction of the thermal transport heat pipe, and the plurality of Peltier devices are arranged along the longitudinal direction of the thermal transport heat pipe, whereby, when using a plurality of Peltier devices, reducing power consumption thereof by equalizing each operation of the respective Peltier devices.

Abstract: A transportable PCM (phase change material) module comprises a number of PCM packs; a housing for thermally insulting said number of PCM packs from a module's surrounding medium; spaces separating said packs and forming one or more channels for the flow of a fluid; said housing incorporating a fluid inlet and a fluid outlet; whereby, in use, fluid flows through said channels from said inlet to said outlet. A PCM (phase change material) pack comprises a laminate of a first conducting panel and a second conducting panel enclosing a portion formed primarily of PCM; wherein said portion of PCM incorporates thermal conductors.

Abstract: A cryogenic system comprises: a liquid helium vessel containing liquid helium (LHe) in which are immersed superconducting magnet windings (20); a helium condenser (30); a neck (32) providing fluid communication between the liquid helium vessel and the helium condenser; a heater (42) disposed outside of and not surrounding the neck; and a thermally conductive passive deicing member (50) disposed in the neck, the thermally conductive passive deicing member thermally coupled with the heater to conduct heat from the heater into the neck. A deicing method for deicing a neck (32) of a liquid helium vessel of a superconducting magnet system comprises generating heat at a location (30, 42) outside of the neck and conducting an amount of the generated heat effective for deicing the neck from outside of the neck through an opening of the neck and into the neck to deice the neck.

Abstract: A method for cooling a superconducting magnet enclosed in a cryostat of a magnetic resonance imaging system comprises introducing a gas into a cooling path in the cryostat from an input portion outside the cryostat. A heat exchanger in the cooling path is cooled by a refrigerator outside the cryostat. The gas at the heat exchanger is cooled as a cold gas or is condensed at the heat exchanger into a liquid cryogen. The cold gas or liquid cryogen from the heat exchanger flows through at least a connection tube to a magnet cooling tube, which is in thermal contact with the superconducting magnet. Heat from the superconducting magnet is removed by warming the cold gas into warm gas or by the boiling the liquid cryogen into boiled-off gas. The warm gas or boiled-off gas is transmitted back to the heat exchanger to re-cool the warm gas or re-condense the boiled-off gas for further cooling the superconducting magnet to a superconducting temperature.

Abstract: The invention relates to a method and system for operating a LNG fuelled marine vessel. The marine vessel (1) comprises a LNG storage tank (3) and a LNG fuelled power plant (71). LNG is stored in the LNG storage tank, and in connection with a bunkering operation the marine vessel is supplied with LNG by connecting a source of LNG to a bunkering line (14) of the marine vessel and subsequently supplying the marine vessel with LNG through the bunkering line. In order to achieve a faster bunkering operation the bunkering line (14) is cooled down prior to the bunkering operation.

Abstract: Methods for filling magnets, cooling magnets and energizing magnets are disclosed. The methods are performed at a helium transfill facility, and helium is employed in filling the magnet, cooling the magnet to appropriate temperatures and energizing the magnet such that it can be employed in operations where superconductive magnets are required.

Abstract: A method of cooling foodstuff comprises immersing at least one perforated container containing foodstuff into an ice slurry bath for a period of time sufficient to allow ice slurry to enter the at least one perforated container and then subsequently removing the at least one perforated container from the ice slurry bath. Various apparatuses for cooling foodstuff are also provided.

Abstract: Evaporative coolers are disclosed. An evaporative cooler includes a cooler housing, a centrifugal fan, and a motor. The cooler housing defines an interior region, a single air inlet, and an air outlet. The single air inlet is positioned to permit air flow into the interior region generally along an inlet axis. The air outlet is positioned to permit air flow from the interior region generally along an outlet axis. The inlet axis and outlet axis are angled with respect to one another. The centrifugal fan is mounted within the interior region of the cooler housing. The centrifugal fan is oriented to rotate about a vertical axis that is substantially orthogonal to the inlet and outlet axes. The motor is mounted within the interior region of the cooler housing and is coupled to the centrifugal fan. The motor is configured to rotate the centrifugal fan about the vertical axis.

Abstract: Evaporative coolers are disclosed. The evaporative cooler includes a cooler housing, a pump, a float, and a magnetic switch. The cooler housing defines a receptacle for receiving water. The pump is disposed at least partially within the receptacle defined by the cooler housing. The pump is configured to pump water received in the receptacle defined by the cooler housing. The float is disposed within the cooler housing and positioned to float on the water received in the receptacle defined by the cooler housing. The float includes a magnet. The magnetic switch is mounted on the cooler housing and configured for activation when the magnet is proximal to the magnetic switch. The magnetic switch is electrically coupled to the pump such that the pump is deactivated when the magnetic switch is activated by the magnet.

Abstract: This appliance is an attractive clear plastic box that is cooled by a thermo electric cooling module. It displays AND extends the life of fresh produce. It is intended to be used on a kitchen counter top, so as to get produce out of the refrigerator produce bins.

Abstract: A cold appliance, such as a household refrigerator or freezer, comprising a cooling module (102) and a cabinet (101). The cabinet has been assembled from pre-foamed panels comprising two opposite side wall panels (1), a rear wall panel (4), a top part (2), and a bottom part (103), which are connected essentially perpendicular to each other e.g. by means of mechanical and/or or glue joints, and a door (6). The cabinet comprises a condensation preventing device (160) comprising a heat carrier tube (28, 160) being positioned at a front frame portion of the cabinet of the cold appliance, preferably adjacent to a part of the door (6). The heat carrier tube being filled with a heat carrier fluid, being closed and having a boiler portion (172), which is arranged in thermal contact with a heat generating means (32) of said cooling module for boiling the heat carrier fluid.

Abstract: A cold appliance comprising a cooling module (102) and a cabinet (101) comprising a cold compartment (104). The cooling module comprises an air outlet (43) delivering cooled air to the cold compartment and an air inlet (44) receiving air from the cold compartment. The cooling module is arranged at the bottom of the cold appliance, and comprises a cold section (34), and a warm section (35), which is separated from the cold section by an insulating wall (105). An evaporator (33) is arranged in the cold section, and a compressor (36) and a condenser (32) is arranged in the warm section. The condenser comprises a condenser tube (32), which is arranged in windings on or integrated in a bottom plate (31) of the cooling module.

Abstract: A refrigerant system includes a dual-connection drain pan for collecting and draining condensate from the exterior surface of a cooling coil. The drain pan includes a first channel and a second channel disposed alongside each other and sloped lengthwise in opposite directions to direct the condensate to either one of two drain outlets at opposite ends of the pan. To drain the condensate to a first outlet, a breakaway removable dam between the two channels is left intact to isolate the second channel from condensate so that the condensate drains from the first channel to the first outlet. Permanently removing the breakaway dam and plugging the first outlet allows condensate to drain from the first channel, into the second channel, and out through the second outlet. In some embodiments, the drain pan, including the two channels and breakaway dam, is formed of a unitary piece of a thermoset polymer.

Abstract: A refrigerator is provided. In the refrigerator, a manufacture cost for a buffer device to buffer a shock generated when opening a home bar door, can be reduced.

Abstract: A refrigerated case includes a body having a left and a right side, a top, and a back. A refrigerated compartment is located within the body. A number of shelves are within the refrigerated compartment. A base compartment is below the refrigerated compartment. A dividing wall separates the base compartment from the refrigerated compartment. A refrigeration module is located within the base compartment. A support member intermediate to the left and right sides supports the shelves. A transverse beam supports the support member.

Abstract: A single medium voltage starter box is mounted on a chiller unit with the other components of the chiller system. The starter box can be positioned on the chiller system unit to permit the starter box to be close coupled to the motor, and specifically to the main motor lead exit hub without the need for any power conduit connections between the starter box and the motor. In addition, the starter box also does not require any control interface and receives controls from a control panel. A short conduit connection between the control panel and the starter box is used to provide the necessary connections between the control panel and the starter box.

Abstract: A refrigerating apparatus in which a two-stage compression refrigeration cycle is performed includes a refrigerant circuit and a volume ratio changing unit. The refrigerant circuit is connected to a compressor having a plurality of compression mechanisms mechanically connected together with a single drive shaft. The compression mechanisms include four cylinder chambers. The volume ratio changing unit is configured to change a ratio of a suction volume of a low-pressure compression mechanism to a suction volume of a high-pressure compression mechanism.

Abstract: An interchangeable jewelry system includes an interchangeable setting and a main body to selectively mount the interchangeable setting, the main body includes a band portion designed to be worn by a wearer, and a base portion to receive the interchangeable setting, the base portion includes a receiving platform to receive the coupler, an open cage extending from the platform to partially surround the interchangeable setting, and an openable cover movably coupled to the open cage to partially surround the ornamental item, wherein the openable cover moves between an open position and a closed position, the interchangeable setting is mounted to the main body when the openable cover is in the open position to dispose a main portion of the ornamental item above the open cage, and the openable cover partially surrounds the ornamental item in the closed position when the coupler is coupled to the main body.

Abstract: A jewelry ring and associated method includes a shank, and a cross member having ornamental elements which is received by the shank. The shank has two upwardly directed slots which accept the cross member and allow it to slide upward toward the ends of the shank. When the ring is worn the finger holds the cross member in the slots of the shank. The cross member includes ornamental elements which rotate around a rod. End members on the rod retain the ornamental elements, and prevent the rod from sliding transversely through the slots in the shank.

Abstract: A jewelry ring and associated method includes a shank, and a cross member having ornamental elements which is received by the shank. The shank has two upwardly directed slots which accept the cross member and allow it to slide upward toward the ends of the shank. When the ring is worn the finger holds the cross member in the slots of the shank. The cross member includes ornamental elements which rotate around a rod. End members on the rod retain the ornamental elements, and prevent the rod from sliding transversely through the slots in the shank.

Abstract: A finger ring capable of holding interchangeable gemstones of different colors. The finger ring comprises a loop made of spring wire shaped to fit around a human finger. The loop comprises first and second end portions that are movable relative to each when the loop is flexed. First and second half-settings are respectively mounted to the first and second end portions. These half-settings are movable between open and closed positions during flexure of the loop. The half-settings in their closed positions form a setting capable of securely holding a gemstone and in their open positions are incapable of securely holding the same gemstone. The disclosed structure that facilitates gem interchangeability can also be incorporated in pendants or earrings.

Abstract: The present invention relates to a process for production of a synthetic quartz glass having a fluorine concentration of 1,000 mass ppm or more, the process comprising: (a) a step of depositing and growing quartz glass fine particles obtained by flame hydrolysis of a glass forming raw material onto a substrate, to thereby form a porous glass body; (b) a step of keeping the porous glass body in a reaction vessel that is filled with elemental fluorine (F2) or a mixed gas comprising elemental fluorine (F2) diluted with an inert gas and contains a solid metal fluoride, to thereby obtain a fluorine-containing porous glass body; and (c) a step of heating the fluorine-containing porous glass body to a transparent vitrification temperature, to thereby obtain a fluorine-containing transparent glass body.

Abstract: New and improved compositions of doped fluorophosphate glasses for lasers have a high refractive index (nD) of approximately 1.6 to 1.7, high transmission in the near infrared part of the spectrum and a wide glass forming domain. These glass systems, Ba(PO3)2—Al(PO3)3—BaF2-Dopants, utilize dopants from the group of oxides or fluorides of the rare earth elements Nd, Er, Yb, Tm, Tb, Ho and Pr as well as MnO and mixtures thereof. The composition of glass includes chemical durability, efficiency of laser use in the infrared spectrum and improved duration of luminescence. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. This is a continuation-in-part of application Ser. No. 09/892,238 filed on 06-26-2001 which application is pending.

Abstract: The present invention relates to an apparatus and a method of making a mineral melt, the method comprising the steps of providing a circulating combustion chamber (1); injecting fuel, preheated mineral material and combustion gas into the circulating combustion chamber (1); combusting the fuel in the circulating combustion chamber (1) thereby melting the mineral material to form a mineral melt and generating exhaust gases; separating the exhaust gases from the mineral melt, collecting the mineral melt (9) and passing the exhaust gases (10) to a heat exchange system, the method being characterised in that the mineral material comprises a first mineral material and a second mineral material wherein the first mineral material has a higher sintering temperature than the second mineral material and the first and second mineral materials are provided separately to the heat exchange system, wherein the first mineral material is preheated through contact with the exhaust gases and subsequently the second mineral mate

Abstract: A washing appliance (2) is provided which is comprised of a dedicated reservoir (6) for the washing appliance (2), the reservoir (16) having an inlet (12) to allow inflow of water and an outlet (17) to enable outflow of water, and at least one heat exchange means (10) characterised in that at least one heat exchange means (10) is adapted and configured to transfer ambient energy outside the reservoir (6) into the reservoir (6).

Abstract: A front loading washing machine including a housing; a water reservoir installed in the housing for containing washing water; a spin tub provided in the water reservoir to hold laundry to be washed, the spin tub having an annular recess and rotating with respect to a horizontal axis of the washing machine; and at least one balancer installed in the annular recess of the spin tub, the balancer comprising an annular shaped race formed of a plastic material.

Abstract: A sliding drawer washing machine in which the drum can be moved between a retracted position within the outer dimension of the washing machine and a withdrawn position wherein access may be gained to the inside of the drum in a substantially vertical direction comprising a drum for a washing machine comprising a substantially lateral wall (2), and first and second end walls (3, 16), characterised in that the lateral wall (2) is comprised of adjacent circumferential zones, the first zone (4) having a plurality of apertures therein and the second zone (6) being substantially aperture free.

Abstract: A lock apparatus includes a lock body which is slidably mountable over the legs of the shackle. At least one push nut is mounted within a recess carried in the lock body to allow easy insertion of the legs of the shackle through the bores in the lock sections and the at least one push nut, but exerts a substantial force resisting separation of the lock body from the shackle in an opposite direction. The lock body is formed of a unitary one-piece body, or a pair of identical lock sections which are reoriented with respect to each other and inter-engaged to form bores at one edge which receive the legs of the shackle. A method of installing the lock apparatus includes mounting at least one push nut in a lock body and then inserting the legs of the shackle through bores in the lock body and the at least one push nut.

Abstract: A security system is disclosed. The security system may include a breakaway key and security apparatus. The breakaway key may have one or more stress areas, to facilitate separation of the key when it is improperly used. The security apparatus may have a rotatable sleeve, so that a user attempting to twist the security apparatus will only end up twisting the sleeve. Thus, the security apparatus cannot easily be broken by a rotation.

Abstract: A door opening and closing device for a vehicle is provided in which a pivoting force of a rotor pivoting in response to a key operation of a cylinder lock is transmitted to a key operating force input member side of a door lock device via a pivot rod, wherein pivoting force transmission means (18) is provided between a pivot rod (17) and the key operating force input member, the pivoting force transmission means (18) being formed by housing within an extension case (103) a driven-side pivot member detachably linked to the key operating force input member in a relatively non-pivotable manner, a drive-side pivot member detachably linked to the other end part of the pivot rod (17) in a relatively non-pivotable manner, and a transmission member transmitting a pivoting force from the drive-side pivot member to the driven-side pivot member, and the extension case (103) is detachably mounted on a casing (25A) of a door lock device (16A) so as to extend from the casing (25A).

Abstract: An actuation device for a steering lock is operable to selectively lock a rotary steering member against rotation. A lockbolt is movable along a first axis between a steering member-locking position and a steering member-unlocking position. A shuttle is movable between a non-blocking position in which the shuttle does not obstruct movement of the lockbolt from the steering member-locking position to the steering member-unlocking position and a blocking position in which the shuttle obstructs movement of the lockbolt from the steering member-locking position to the steering member-unlocking position. An actuator is coupled to the shuttle and operable to move the shuttle from at least one of the non-blocking position and the blocking position to the other of the non-blocking position and the blocking position. The actuator has an output defining a second axis that is substantially perpendicular to the first axis.

Abstract: An automatic bike locking charging machine is provided. By operating a control member and a slot of a panel, a control circuit board drives a control unit to open or close a swing rod connected with a rotary rod of a decelerating device with respect to a casing, such that the frame of a bike is restrained between a hooking rod of the casing and the swing rod of the rotary rod of the decelerating device to park the bike and to provide an anti-theft function.

Abstract: The invention relates to a remote control device with a stowable key, in particular for an automobile, which comprises a remote control casing including two lower (1) and upper (2) shells, an insert (3) defining a key-bit pivotally mounted between an extended use position and a stowed position inside the casing, and an elastic return mechanism for returning the insert to the extended position, which comprises a push button (4) provided on the upper shell (2). According to the invention, the insert (3) rotates directly about said button (4) which is rotatingly connected with the upper shell (2), and includes rotational indexing means with said insert (3) that can be declutched by pushing said button (4).