Patent GB-213253-A (GB)
Title: Improvements in or relating to phonographs or like sound reproducing machines
IPC: G10K13/00
Filed: 1924-03-18
Abstract: 213,253. Yrarrßzaval, G. G. de Andia-. March 20, 1923, [Convention date]. Trumpets, arranging and supporting.-In a phonograph or like machine, a sound-amplifier .of special construction, which replaces the usual horn, comprises a trumpet 25, which may be elliptical in cross-section and is mounted on a flaring tube 24 connected to the sound-box 22, Fig. 1. The latter is so mounted that it lies directly in the path of the sound which issues from the trumpet, and the sole communication between the tube 24 and the trumpet is through the open end of the tube. The sound tube 24 is rigidly connected to the trumpet, and lies along the axis thereof. The closed end 26 of the trumpet may be shaped as a paraboloid, and may have a separate sound-reflector 27 fitted therein, Fig. 2. The reflection can be adjusted towards or away from the wider end of the tube 24, and a Bowden cable or other distance-control device may be provided for this purpose. The soundamplifier is pivoted near its close end on a fork 32, the stem of which is mounted, with vertical adjustment, in a rotatable socket 20, carried by the plate 5. The Specification as open to inspection under Sect. 91 (3) (a), states also that the soundreproducer and amplifier form an independent unit, which may be rotatably mounted on any convenient support, and used in combination with any motor-driven turntable. Means are also described whereby a gramophone or the like may be collapsed for transport. This subjectmatter, in addition to the other features described in the following paragraphs, does not appear in the Specification as accepted. Cases.-Fig. 1 shows a gramophone in which the casing comprises a box 1 which encloses the motor and may be made of metal or rubber, felt. &c. Plates 5, 6 are hinged to upper edges of the box, and are adapted to be folded one upon the other when the machine is not in use. Another plate 7 is hinged to a lower edge of the casing and can be folded against the side face 8, and a drawer-like structure 9, 10 is fitted to slide in guides 11 on opposite sides of the box. When pulled out as shown, the drawer forms a support for the winding-handle 12. Fig. 10 (Cancelled) shows a modified construction of collapsable gramophone, in which the motor casing 1 is detachably supported on the underside, of a top plate 43 by means of flanged members 42, between which tongues on the casing 1 slide. The plate 43 consists of two hinged parts, and is. grooved to fit on side walls 48, which also fit a base 50 formed, like the top plate, of two hinged, parts. The side walls are formed of hinged members as shown in Fig. 9 (Cancelled), so that they can be readily packed together when the top and bottom plates are removed. The detachable winding-handle, not shown, projects through a hole in a side-wall, a funnel being provided on the motor casing to guide it into position. In a further modification shown in Fig. 12 (Cancelled) the casing forms a resonance chamber, wiith which the tone-arm 54 communicates. The side walls, over which the flanged top and bottom parts 43, 50 fit. are hinged at their edges so that they can be folded. Openings for the escape of sound, which may be provided with a controlling shutter, are formed in one of the walls. The side walls may be made foldable in various other ways, for example as shown in Figs. 17 and 19 (Cancelled). In the latter case, the links 56 are covered by cloth or the like. Speed-regulating.-In the construction shown in Fig. 1, the speed-regulator of the motor is controlled by means of a lever 16, which is hinged at 17 so that it can be disposed against the side of the casing 1, but when in use is arranged as shown with a projection 19 thereon in engagement with a knob-ended screw 15 on the plate 6. Turntables.-The turntable 3, Fig. 1, is mounted on a removable pin 2, passing through the top of the casing into a driving socket. A collapsable turntable, Fig. 4 (Cancelled) may be provided. It consists of arms 41 removably or pivotally attached to a hub 40. Tool-arms and mountings; dampers for soundmodifying.-A stylus-holder fitted with a damper, and adapted especially to receive a wooden stylus, is shown in Fig. 5 (Cancelled). The holder comprises a perforated pyramidal body 34 having a rod 35 to engage the usual needlesocket. One or more leaf-springs 37, carrying a resilient pad 39 which is adapted to bear against the stylus, are attached to the body 34.