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    • 9. 发明专利
    • Improved knife sharpener
    • GB717490A
    • 1954-10-27
    • GB326453
    • 1953-02-05
    • WENDELIN PETER ARNOLD
    • B24D15/08
    • 717,490. Knife sharpeners. ARNOLD, W. P. Feb. 5, 1953 [Feb. 19, 1952], No. 3264/53. Class 60 . A knife sharpener has a base unit consisting of two base pieces 10, 11 to which wheelsupporting elements 12, 13 are secured by screws 14. An abrasive wheel 15 is rotatably mounted on element 12 by an axle 16 passing through a bore in the wheel and through a bore 17 in the element 12 and held in position by a washer 18 and wing-nut 19. An abrasive wheel 20 is similarly mounted on element 13. The wheels 15, 20 are mounted with their axes of rotation intersecting at an acute angle with their peripheries in substantially point contact at 25 and with their planes of rotation forming an acute angle with the plane of the base unit due to this disposition, the wheels rotate as a knife blade is drawn between them past their point of contact. The abrasive wheels 15, 20 are cylindrical, the cylindrical edge of each wheel' being preferably bevelled at 26 along the line where it meets one of the side faces of the wheel; the contact 25 of the two wheels occurs between the two bevelled edges 26. A bevelled edge such as 26 may be provided on each side of each wheel 15, 20 so that if excessive wear takes place, the wheels may be removed and replaced in reversed position. The base pieces 10, 11 are connected by bars 27, 28, the bar 27 extending from base piece 11 to enter a bore in base piece 10 and the bar 28 extending from base piece 10 'to enter a bore 30 in the base piece 11. When the abrasive wheels 15, 20 wear the desired contact of the wheels is maintained by moving base pieces 10, 12 towards one another ; the base pieces 10, 11 are secured in their adjusted positions by a rod 31 carrying a wing-nut 33 and passing through a bore in the base piece 10, the threaded end 32 of the rod engaging a threaded bore 34 in base piece 11.
    • 10. 发明专利
    • Improvements in and relating to electric discharge lamps
    • GB595274A
    • 1947-12-01
    • GB503045
    • 1945-02-28
    • GEN ELECTRIC CO LTDPETER ARNOLD HOAREEVAN HERBERT NELSON
    • H01J9/04
    • 595,274. Cathode materials and processing. GENERAL ELECTRIC CO., Ltd., HOARE, P. A., and NELSON, E. H. Feb. 28, 1945, No. 5030. [Class 39 (i)] A method of coating an electric discharge lamp electrode with an emissive material comprises the steps of coating a tungsten electrode with a suspension containing thorium powder, but substantially no other metallic ingredient, and heating the coated electrode to a temperature above 1800‹ C., in an atmosphere which is inert to the tungsten and thorium. In the example given, a tungsten coil is cleaned and painted with a suspension containing thorium powder at least as fine as 150 mesh and preferably 200 mesh, the suspending medium being, for example, 10 per cent solution of nitrocellulose in amyl acetate. When dry, the coated coil is heated in an atmosphere of dry hydrogen at atmospheric pressure to a temperature in the range 1580‹ to 1620‹ C., preferably 1600‹ C., for 1 minute, and the temperature is then raised to a temperature in the range 1830‹ to 1870‹ C., preferably 1850‹ C., which is maintained for a further minute. Specifications 230,226, 240,213 and 306,281, [all in Class 39 (i)], are referred to.