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5. 发明专利

GB357149A Improvements in the construction of ships sterns, increasing the efficiency of screwpropulsion 未知
公开(公告)号：GB357149A
公开(公告)日：1931-09-16
申请号：GB1839630
申请日：1930-06-16
申请人： FRANZ MELCHER
IPC分类号： B63B1/08
摘要： 357,149. Ships' sterns. MELCHER, F., 49, Gersthoferstrasse, Vienna. June 16, 1930, No. 18396. [Classes 113 (ii) and 114.] To improve the flow of water to and from the propeller, the stern is provided with guide furrows 3, the form of which follow orthogonal trajectories which grow as at 5 out of the hull and project beyond the mean girth so that the furrow shows the greatest curvature adjacent to the propeller 2, becoming wider and shallower both fore and aft. The screw shaft supports may be partly encased in the base of the furrow and the excrescences forming the boundaries of the furrow may be tapered off to a sharp end at the stern.

6. 发明专利

GB352507A Improvements in and relating to screw propellers with flexible blades 未知
公开(公告)号：GB352507A
公开(公告)日：1931-07-10
申请号：GB1144730
申请日：1930-04-10
申请人： FRANZ MELCHER
IPC分类号： B63H1/12
摘要： 352,507. Screw propellers. MELCHER, F., 146, Geutzgasse, Vienna. April 10, 1930, No. 11447. [Class 114.] Screw propeller blades are formed with a rigid leading edge and with flexible resilient blade surfaces. The leading edge 1 of propeller blade 3 is formed as a gradually tapering arm 4 integral with the boss and is shaped at the rearward edge to form shoulders and may have stiffening ribs 7. The two side-plates 8, 9 are attached to the shoulder on the rib and sprung so that the rear edges are held together resiliently. Apertures 10 may be made in the frame for connecting the hollow interior with the outside. The blade plate 8 projects beyond the following edge of the pressure plate 9 and is provided at intervals along its outer edge with slits 12. Instead of single blade plates laminations may be used and the laminations may be supported by providing distance-pieces at the position of attachment to the main rib. Instead of providing a blade plate with slits it may be built up of a number of narrow metal leaves arranged in juxtaposition. The plates may be of graded tapered thickness to increase their resiliency.

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