08-04-1970 дата публикации
Номер: GB0001186851A
Принадлежит:
... 1,186,851. Flexible tubes. R. M. JOHNSON. 21 April, 1967 [21 Jan., 1966], No. 2835/66. Heading F2P. [Also in Division A1] In order to prevent the fouling of ledges, e.g. of window sills, lintels, cornices &c. on buildings, at least one collapsible tube of flexible material e.g. polythene, is secured to the ledge, one end of each tube having an inlet aperture connected to a source capable of supplying pulses of compressed air, or gas, and a restricted outlet being located at, or adjacent, the other end. A tube may be secured to a ledge of wood, or concrete, by nails passed through it adjacent one side remote from the outer edge of the ledge, alternatively eyelets may be provided along one side of the tube for fastening to pins, or hooks, mounted upon a ledge. A tube, or each of a plurality of tubes, may be connected to a pulse delivering air- or gas-compressor, or to a compressor through a pulse-producing valve, either of which arrangements may be controlled by an adjustable timing device ...
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