The disclosed embodiments provide a highly efficient, utility scale energy storage and retrieval system. The system is characterized by a chain of multiple rotating interconnected masses (8), a hollow toroid- shaped housing (1), plural pairs of permanent magnets (7, 11), magnets (7, 11) and coils (10) for the charging and discharging of electric energy and is operated by an automated control system. The mass (8) chain is fitted and rotating inside the housing (1), and the energy is stored into the rotational energy of the chain. The transformation of electrical energy into rotational energy or vice versa is carried out by using coil units (10). In order to minimize losses, the chain is magnetically levitating and a vacuum is pumped into the housing (1).

The invention relates to a device for locking at least one belt (10) at predetermined belt tension, which belt (10) is arranged at a machine arrangement (1) with belt drive. The machine arrangement comprises a stand (3) having legs (2) placed on a base (4). At least one driving pulley (5) and at least one driven pulley (6) are aligned relative to each other. The legs (2) being articulately attached to at least one of the stand (3) or the base (4), and at least two of the legs (2) comprises longitudinally adjustable tension legs (20), which each comprises a first tension leg part (21) having a wedge box (30) arranged to receive a wedge (31) having a grooved surface (32) and a second tension leg part (22) having a grooved surface (23) directed towards said wedge box (30). The first (21) and second (22) tension leg parts are adapted to lock in relation to each other by cooperation between the grooved surface (32) of the wedge (31) and the grooved surface (23) of the second tension leg part (22) when the wedge (31) is adapted to wedge in wedge box (30).

The invention concerns a device for ice-breaking with ice-breaking hull of vessel. According to the invention, there are utilized two functionally separate elements (I, II) of different width (B; D), one upper and wider element (I) of which is situated next to the water line (13) for breaking of unbroken ice (14), while a more slender element (II) situated below the same is intended for the transport of the broken ice (15) sideways and under the unbroken ice (14). The upper wider element (I), which is provided with an essentially flat lower part portion (11) abaft an inclining front part (10), is arranged to at a small frame angle (a), preferably less than 15°, break the ice (14) downwards when moving ahead. An essentially flat stern part (12), which has a small frame angle (c), preferably less than 20°, is arranged to break the ice (14) downwards when moving astern. The lower and more slender element (II) has essentially vertical side portions (7,8,9) which in the forebody and the afterbody have been provided with marked wedge-shape which sideways shove the broken ice (15) the transport of which sideways and astern is augmented by bow propellers (17) and wing propellers (18).

The invention relates to a spray cooler (1 ) to be arranged on the surface of the water and a method for cooling water. The spray cooler (1 ) comprises a frame (2) and supported thereon a suction pipe (3), the lower end (8) of which can be arranged below the surface of the water (9) and the upper end above the surface of the water or near the surface of the water (9), a pump (4) for bringing the water to flow into the lower end (8) of the suction pipe and out of the upper end (10) of the suction pipe, which pump comprises a propeller (1 1 ) arranged to be rotatable around the mainly vertical axis (7), a centrifugal sprayer (5) for generating a water spray (20) away from the spray cooler (1 ), which centrifugal sprayer (5) is located at least mainly above the upper end (10) of the suction pipe and arranged to be rotatable around said axis (7), which centrifugal sprayer comprises an upwards expanding upper cone (12) located on the axis (7) and blades (14) located on the surface (13) of the upper cone, a power source, such as an electric motor (6), which is arranged to rotate said axis (7) and thus the propeller (1 1 ) and the centrifugal sprayer (5), and which power source (6) is supported on the frame (2) above the upper cone (12) with legs (17). The legs (17) are supported on the frame (2) at the upper cone (12) or below the upper cone (12), whereby the horizontal cross-section of the legs (17) is longitudinal at the upper cone (12) in the direction of the water spray (20).

A drill head (4) for a rotation drilling rig (1), including: a rotation motor (M), a drill head spindle (7), and a gear change transmission (8) between the rotation motor and the drill head spindle, the gear change transmission (8) including an input shaft (9) connected to the rotation motor and an output shaft (10) connected to the drill head spindle. The input shaft (9) is co-axial with the output shaft (10), the input shaft (9) is permanently coupled to an intermediate shaft (12) over a first speed reduction gear couple (13), the gear change transmission (8) includes a clutch (14) being shiftable between a first position interconnecting the input and output shafts (9,10) for obtaining the same rotational speed for the input and output shafts, and a second position connecting the intermediate shaft (12) to the output shaft (10) over a second speed reduction gear couple (15). The invention also relates to a rig.

A chuck (5) for a drill head (4) of a rotation rock drilling rig (1), wherein a plurality of jaws (7) are equally angularly distributed around a grip position axis (9), wherein the jaws co-operate with actuator means (10) for radial movements of the jaws (7), and wherein the chuck includes urging means being arranged for influencing the jaws into the release position. The urging means is a partially annular jaw spring (8) surrounding said axis (9) and having two spring ends (20, 21) adjacent to each other. The jaws (7) together form an inside seat (24) for the jaw spring and the jaw spring (8) is arranged for fixing engagement with one of the jaws (7). The invention also relates to a drill head, a rig and a jaw spring.

The invention relates to a ski binding intended for attachment of a ski shoe having a shoe tip that is flexible in the longitudinal direction and equipped with a transverse locking pin in the forward part of the shoe tip, and which is wider than the shoe tip such that the locking pin protrudes some way out on each side of the shoe tip. The ski binding is suitable for cross-country, classic style, skating/freestyle, touring and telemark skiing.

A personal communication device provided with means for the detection of potential harmful radiation emitted by the device and which is provided with a data memory module that records the characteristics of the data detected to provide real time data for the study of potentially harmful radiation.

A control unit of an internal combustion engine, specifically for actuating injectors or gas valves of a fuel supply system of the internal combustion engine, wherein the control unit actuates each injector to open said injector in such a way that the voltage applied to the respective injector changes between different voltage levels both in a boost phase of the actuation and in a hold phase of the actuation, and wherein the control unit actuates the respective injector in the boost phase in such a way that, after a defined boost current level has been reached, the voltage applied to the respective injector changes between a relatively low boost voltage level, which is greater than zero volts, and a relatively high boost voltage level, which is greater than a supply voltage of the control unit.

A remedial device for the reduction or elimination of the potentially harmful effects on humans or animal life caused by exposure to electromagnetic fields produced by devices that are battery operated and transmit RF signals containing a module for the detection and analysis of the RF signals wherein said module is powered by the battery of the device and when the presence of potentially harmful radiation is detected the detection activates a remedial signal generator and the protocol and mode of communication and the signals are analysed to determine whether they are likely to cause biological effects and the remedial signal is tailored accordingly.