Abstract: An improved door closing device has a door closer main body for exerting a closing force on a door, a guide rail for guiding a slider, a tension spring provided in the guide rail and a releasably connecting device for releasably connecting the tension spring with the slider at a certain angular position of the door whereby a closing force can be additionally exerted near a position where the door is completely opened.

Abstract: An impact rod is vertically guided within a guide cylinder to drop into a glass bottle to be tested which is held vertically below by a bottle gripper, the impact rod thereby striking the bottom of the bottle with preset impact force. A plurality of these guide cylinders with respective impact rods and corresponding bottle grippers are supported on structures revolving unitarily around a pole, the bottle grippers operating to grip successively bottles supplied from a production line and to carry the bottles around a partial circle as they are tested by the corresponding impact rods which are operated by adjustable cam action. The impact force is adjustably variable by adjusting the height of drop and/or weight of the impact rod.

Abstract: In the method of exposing a relatively large number of parallel, spaced apart stripe-like areas on the surface of a photo-sensitive member by directing light against such surface through an original photo-mask having a light-permeable pattern comprised of a relatively small number of parallel, spaced apart transparent stripes of lengths substantially smaller than the length of the areas to be exposed, and by effecting repeated relative scanning movements of the photo-sensitive member and photo-mask in the direction of the transparent stripes and relatively shifting the photo-sensitive member and the photo-mask in the direction transverse to the transparent stripes for each of the relative scanning movements so that, upon the completion of the repeated movements, light passing through the light-permeable pattern of the photo-mask will have scanned the desired relatively large number of stripe-like areas to be exposed on the surface of the photo-sensitive member; the transparent stripes of the original photo-ma

Abstract: An axial piston power transmission of which a housing is provided with a protruded portion extending from the inner surface toward the outer periphery of a cylinder barrel and the maximum flow velocity of drain is generated between the protruded portion and the outer periphery of the cylinder barrel so that renewal of drain may be stimulated, simultaneously a cooling effect with respect to all sliding surfaces within the housing may be improved and also the variational characteristc may be held constant by making a thrust plate variable in an angle of inclination thereof.