Abstract: An approach is provided for operating a radio network, wherein the operating frequency is varied systematically according to an enciphered sudden-frequency-change scheme and retained only during a hop. Several hops are combined to form a service interval, a service window being arranged at a variable position within the service interval. Given hops for different functionalities (late traffic entry, break-in, hailing, late network entry) of the radio network are specified in the service window.

Abstract: A device for controlling the delivery of a combustible gas to a burner apparatus is provided. The device includes a main pipe for delivery of the gas in which are disposed first and second servovalves in cascade with each other, with respect to the direction of flow of the gas. The servovalves include respective valve seats associated with corresponding shut-off means with diaphragm control for the opening of the seats. The first and second servovalves include respective first and second control solenoid valves with electromagnetic operating means to control the opening/closing of the corresponding servovalve. The solenoid valves are arranged to act to open/close the pipes of respective servo-assisted control circuits, so as to control indirectly, by way of the diaphragm control, the respective shut-off means of the corresponding servovalve the pipes of the control circuit placing the main pipe in fluid communication with respective control chambers of the servovalves.

Abstract: A ceramic burner plaque is described being of a predetermined thickness defined between first and second planar surfaces and through which a plurality of burner ports (6) pass from one surface to the other. The ports are arranged in offset rows and a plurality of polygonal channels (10) are cut into the second surface (8) of the plaque, said channels also being arranged in offset fashion rows and being of a depth less than the thickness of the plaque. The channels are ideally octogonal in shape and of a width which widens progressively from the narrow base of the channel within the thickness of the plaque towards the second surface. The width of the channels at their base is ideally similar or marginally greater to the dimensions of the burner ports and the shape and position of the channels is such that a plurality of burner ports are coincidental with the base thereof.

Abstract: A knob adjustment device particularly for adjusting the temperature in valve units for water-heating apparatus. The device comprises a geared transmission interposed between the knob and an operating member of the valve unit in order to transmit a rotary movement to the member about its own axis as a result of a rotation of the knob. The geared transmission includes a reduction mechanism with a variable transmission ratio such that, for a first angular portion and a second angular portion of the rotation of the knob, the member is rotated with respective different transmission ratios (T1,T2).

Abstract: A method of secure communication in which communication partners (A, B) in each case have a secret (S) and a public code (P), in which the communication partner (A) selects a random number (x) and the communication partner (B) selects a random number (y), in which a first partial code (Ax) is formed by the communication partner (A) and a second partial code (By) is formed by the communication partner (B) by using the public code (P) of the respective partner (B, A) and is transmitted to the respective other communication partner (B, A). A session code (gxy, gyx) is formed from the private random number (x, y), and the partial code (By, Ax) of the respective communication partner (B, A) while using the private secret code (S), the partial codes (Ax, By) and the session codes (gxy, gyx) being calculated in a fashion similar to the Diffie-Hellmann protocol.

Abstract: A valve unit for controlling the delivery of a fuel gas through a delivery duct (3) comprises a valve seat (6) in the duct, a closure member (5) associated with the seat, a motor-driven actuator (7) acting on the closure member in order to control it so as to open/close the valve seat, as well as an electromagnetic unit (22) with a first portion (23) carrying a magnetizing winding (24) and a second portion (25) which can be fixed firmly to the first position by magnetization.

Abstract: A burst protector for a turbocharger covers a first endangered segment of the housing. The burst protector includes insulation, a first sheet, and a second sheet. As a supplement, a casing is installed around the burst protector. The safety of a turbocharger in operation is increased by the invention.

Abstract: A burner manifold for one or a series of burners including a first chamber having at least one outlet leading to said one or more burners and gas supply means arranged to introduce gas to mix with the air. Air is introduced into the first chamber from a second chamber, which is supplied with air under pressure via an inlet and the first and second chambers are arranged to be in fluid communication via a plurality of apertures.

Abstract: A passenger seat for a conveyance, comprising a frame (2), which is fixed to a floor (3) of the conveyance (20), and a backrest (5), which is connected to the frame (2). On the rear of the backrest (5) is mounted a folding seat (7), which has a sitting portion (10), and which is mounted on the backrest (5), thus enabling the folding seat (7) to be tilted about a first axis of rotation (8) between a folded up position and a folded down position. The folding seat (7) has a frist eccentric portion (11), which is eccentric relative to the first axis of rotation (8). The frame (2) has a second eccentric portion (12) which is eccentric relative to a second axis of rotation (6). The backrest (5) is mounted on the frame (2), thus enabling it to be tilted about the second axis of rotation (6) between a rear position and a front position. The passenger seat (1) comprises a rod (15), whose end portions are hinged to the first eccentric portion (11) and the second eccentric portion (12) respectively.

Abstract: A granular composite material for recovering platinum particles from reaction gas flow in nitric acid production, comprising 50-75% calcium oxide by weight; 20-35% of magnesium oxide by weight; and 5-15% by weight of at least one chloride selected from the group consisting of calcium chloride and magnesium chloride; and a method of recovering platinum particles from reaction gas flow in nitric acid production comprising passing the reaction gas through a layer of a sorbent to absorb platinum particles, the sorbent being formed by the granular composite material described above, and extracting the absorbed platinum particles from the sorbent.

Abstract: A device for measuring the flow-rate of gas in a duct, particularly for burners. The device includes a gas flow-rate sensor generating a first output signal proportional to the flow-rate detected, a temperature-compensation circuit receiving the first output signal and generating a second output signal proportional to the gas flow-rate detected by the sensor and independent of the temperature of the gas and/or the flow-rate sensor. The compensation circuit has a temperature sensor. The device also includes a calibration circuit receiving the second output signal. The calibration circuit generates a third output signal proportional to the gas flow-rate detected and independent of structural parameters of the flow-rate sensor and/or of the temperature sensor so that the third output signal is correlated with the flow-rate detected and independent of the temperature of the gas, the temperature of the flow-rate sensor, and the structural parameters of the flow-rate sensor.

Abstract: A knob adjustment device, particularly for adjusting the temperature in valve units of a water-heating apparatus. The knob adjustment device is mounted so as to be rotatable about a rotation axis in a stationary housing of the valve unit and has a safety member for the unidirectional restraint of the knob adjustment device relative to the housing so as to oppose rotation of the knob adjustment device in a first direction of rotation about the axis, the knob adjustment device being free to rotate in the opposite direction of rotation.

Abstract: A valve unit for controlling the delivery of a combustible gas through a gas path comprises a first valve seat in the gas path and a first closure means associated with the seat, a first actuator means for the control of the closure means for opening and closing of the valve seat and also motor means for the operating control of the first actuator means. The unit further comprises a second electromagnetic actuator means interposed between the closure means and the first actuator means to urge the closure means so as to close the valve seat, independently of the operating position of the first actuator means, when a predetermined condition occurs which requires the interception of the valve seat.

Abstract: A passenger chair which can be converted into a child chair, including a floor frame, a passenger back rest with side members which are linked with rear side portions of the frame for tilting the passenger back rest backwards and forwards, the passenger back rest having a first flap the top of which is linked with an upper portion of the passenger back rest and a second flap with a first end portion which is linked with a lower end portion of the first flap. The passenger chair has a mechanism which, when the passenger back rest is moved forwards, effects a forcible rotation of the second flap to an approximately horizontal position, while at the same time the first flap is moved forwards. The first flap thereby forms a back rest and the second flap a seat of a child chair which faces in the opposite direction relative to the passenger chair.

Abstract: An arrangement for a grandstand having a series of sections, each section having a pair of sloping joists each provided with a number of vertical seating beam pillars and a number of walkways between the joists. Fastening and securing devices are provided at an upper part of each seating beam pillar. The fastening devices are provided with first locking devices capable of receiving second locking devices provided at the ends of seating beams intended to be mounted between two opposite seating beam pillars on the joists. One of the locking means has a resilient element. The first locking device is provided with a female member and the second locking device is provided with a male member. The resilient element allows connection of the male and female members with one another to lock the members in their connected positions. The resilient element has at least one tongue provided in connection with one of the members.

Abstract: A device for locking in a removable way a mechanical member with a taper bore onto a shaft having a cylindrical section. A first bush is provided that has internal and external surfaces. A second bush is provided that is suitable to be inserted into the first one. The second bush has an external conical surface and a cylindrical internal surface. The relative axial position of the bushes are varied to engage and disengage the mutual coupling between the bushes and the coupling of the device with a shaft or with the mechanical member.

Abstract: A seat cushion assembly releasably securable to a chair comprising a cushion member having an upper surface for receiving an occupant and a lower surface opposite the upper surface for engaging the chair, at least three straps fastened to the cushion member, and a strap securing member fastenable to a bottom surface of the chair configured to releasably secure the at least three straps, and in turn, substantially preclude movement of the cushion upon the chair.

Abstract: In the system described for connecting a valve unit for gas water-heaters to a tank of the water-heater, a probe belonging to the valve unit is housed in the tank in a leaktight manner. The system comprises a first element belonging to the valve unit and/or fixed thereto, a second element which projects from the tank and can be housed in a seat of the first element, the second element constituting a support and/or cover for the probe and having an outer surface in which there is a transverse groove, and a third element which is restrained axially on the first element and at least a portion of which extends in the seat in an arrangement such as to engage the groove when the second element is housed in the seat so as to clamp the first and second elements to one another axially, the third element being resiliently deformable between a first position in which the said portion projects into the seat and a second position in which the said portion is outside the seat in order to release the groove.