摘要:
A toothbrush comprises two parts (2, 3) which are pivotable relative to one another, of which a first part (2) serves as a handle and of which a second part (3) carries a brush-head (5), a spring (7) being arranged between the parts and having one end (8) fixedly connected to one (2) of the parts and having another end (9) which engages with a wall portion (11) of the second part (3), the second part (3) being pivotable relative to the first part (2) against a pressure exerted by the spring (7) during use of the toothbrush, which spring snaps when a given pressure threshold (P.sub.d) is exceeded, after which the second part (3) is subjected only to a bending load in the absence of a pressure (Q) directed in the longitudinal direction of the spring (7) and exerted by the wall portion (11), and resumes its original position when the pressure has decreased.
摘要:
A tooth-brush is provided which has a brush shank (4) adapted to be driven electrically by a drive (2) and provided with a brush-head (5) having bristles (6), which brush-head performs movement (8), for example, a loosening movement whose frequency is higher than 30 Hz and whose amplitude is between 0.1 mm and 5 mm, which brush-head performs an additional movement (9), for example, a wiping movement having a frequency of between 1 Hz and 5 Hz. The combination of a rapid loosening movement and a slow wiping movement ensures that the teeth are cleaned in a thorough but gentle manner.
摘要:
Magnetic recording media consist of a nonmagnetic substrate and one or more magnetizable layers which are firmly applied thereon and are based on a magnetic material which is finely dispersed in a polymer binder and further conventional additives and essentially consists of ferromagnetic chromium dioxide, and the said recording media are particularly stable to the chemical decomposition due to moisture and oxidizable compounds and hence to deterioration in the magnetic properties, owing to the addition of from 0.1 to 8% by weight of an organic compound from the group consisting of the antioxidants, based on the amount of chromium dioxide, to the magnetic layer.
摘要:
A depilation apparatus is provided comprising at least one pair of circumferentially cooperating depilation rollers (3, 4, 5, 6) which are arranged at the location of an opening (2) in the apparatus and which are rotatably supported and arranged to be driven in opposite directions of rotation, and also comprising a shear plate (11) which is arranged at the location of the opening in the apparatus, which covers the depletion rollers, and which is formed with elongate hair-entry apertures (12, 13, 14, 15, 16, 17) at the location of the depilation rollers, the elongate hair-entry apertures in the shear plate extending in the longitudinal direction of the depilation rollers and at least up to the ends of the depilation rollers.
摘要:
A process for the production of magnetic recording media by applying a magnetic layer, which consists essentially of magnetic material finely dispersed in organic polymers, to one side of a flexible base, and applying a non-magnetizable backing coating which is free of inorganic solids to that side of the base which is opposite the magnetic layer, wherein the backing coating consists of two or more polymers which are incompatible with one another and have precipitated from a solvent mixture, and magnetic recording media produced by this process.
摘要:
Magnetic recording media are produced by preparing a dispersion consisting of finely divided magnetic material, a dispersant, the conventional additives and a solution or a dispersion of a polymeric binder, applying the dispersion in the form of a layer onto a non-magnetizable base, orienting the anisotropic magnetic material by means of a magnetic field and drying the applied layer, by a process in which the dispersant employed is obtained by reactingA. from 70 to 95 parts by weight of a reaction product ofI. from 0.5 to 1.5 moles of an oxoalcohol of 6 to 20 carbon atoms,II. from 6 to 18 moles of ethylene oxide andIII. from 2 to 10 moles of propylene oxide, withB. from 5 to 30 parts by weight of a polyphosphoric acid having a P.sub.2 O.sub.5 content of from 80 to 88%.