[en] The security and integrity of the humble threaded fastener is not always the foremost consideration in the daily routine of engineers. The use of nuts and bolts is still one of the most widely applied methods of joining components together, yet throughout industry these items receive a smaller share of development costs pro rata than most other engineering components. (author)

[en] The invention concerns the improvement of the locking configuration of nuclear reactor fuel cartridges or moderator cartridges with tip-stretched foot pieces fastened to the grid plate of the nuclear reactor. The configuration according to the invention is designed in such manner that only axial movements are required for its operation. The device may be unlocked by simply pulling at the cartridge. (ORU)

[en] The device comprises a housing with an internal cylindrical chamber and a conical seat, a piston in the chamber with a check valve, solicitation and guiding means. When the seat and the check valve are in contact they are jammed in rotation. 2 figs

[en] An improvement of the stretching device of aerosol filter casings is described, housing filter cells for air cleaning of toxic and radioactive gases and dusts. Balanced pressing of the filter cell against the frame-shaped pressure surface is obtained by arranging the aerometer in the plane of the centre line of the pressure framework and by specific arrangement of nuts and brackets described in detail. The invention is illustrated by 8 figures. (UWI)

[en] A quick-acting stud tensioner, for facilitating the loosening or tightening of a stud nut on a reactor vessel stud, has gripper jaws which when the tensioner is lowered into engagement with the upper end of the stud are moved inwards to grip the upper end and which when the tensioner is lifted move outward to release the upper end. (author)

[en] Object: To secure intermediate fittings with a coil fixed thereon by an insulating tape to a fixed body by means of fittings, thereby supporting the coil in a narrow space. Structure: A coil is secured to intermediate fittings by means of an insulating tape, after which the intermediate fittings is mounted on a fixed body through fittings to support the coil in a narrow clearance portion between a plasma sealed vessel and a main coil. (Kamimura, M.)

[en] The invention has been aimed at reducing the time needed for opening or closing containers of greater dimensions. The described fastening system is suitable for remote handling

[en] Closusre studs of pressure vessels tightened in groups with hydraulic tensioning cylinders undergo relaxation when more groups of studs are screwed down. The cause of this is the deformation of flange and vessel head which increases every time another group is tightened. In order that all closure studs after they have been tightened carry the same load, initial tensions of different magnitude have to be given by degrees for the various groups of screws, the tensions counter reacting this relaxation. In this context, the given overall force is to be achieved with the smallest investment. The calculation of optimal initial tension stages is developed by means of a simple mechanical model with the aid of a system of equations, and the application is illustrated by an example. With optimal stages of initial tension forces, the time spent on the initial tightening of closure studs of pressure vessel closures is considerably reduced, and the given overall initial tension force is guaranteed to be kept. (orig.)

[en] A device is described for attaching a collimator to a radiation detector which consists of: a. a cleat means at the radiation detector for cleating the collimator to the radiation detector; b. a latch means for latching the cleated collimator against rotation; c. a collimator cleating detection means associated with the cleat means for detecting incorrect cleating of the collimator; and d. a collimator latching detection means associated with the latch means for detecting incorrect latching of the collimator

[en] The purpose of this study is to analyze the effect of contact pressure on the contact pressure distribution, contact deformation and airtightness generated at the contact surface of bolts fastened by the analytical method for the sealed structure of fastening bolt. In this paper, as a first step, we investigated the characteristics of magnitude and distribution area for contact pressure with respect to the separated distance from bolt center according to the flange bolt size and tightening torque by structural analysis. The sizes of flange bolt were M6, M8, M10 and M12, and the tightening torques were applied with the minimum, intermediate and maximum values according to the size of each flange bolt. The results show that for the same flange bolt, the larger the tightening torque, the larger the surface pressure with respect to the same separated distance from bolt center, and the greater the distribution region slope of contact pressure, but converged to near a value less than the contact pressure of 1 MPa. It is found, moreover, that as the size of flange bolt was increased, in the distribution area of contact pressure from 1 to 3 MPa, the distribution area of surface pressure was widened because the separated distance from bolt center at the same surface pressure became father away.