Patent GB-104420-A (GB)
Title: Improvements in and relating to Talking Machines.
Inventor: HARRIS HARRY WIGHTMAN
IPC: G10K13/00
Filed: 1916-04-19
Abstract: 104,420. Harris, H. W. April 19, 1916. Sound-boxes, balancing; tone-arms; tone-arm joints; horns, arranging and supporting.-The horn and sound conduit are carried on an arm swinging in an horizontal plane, the sound conduit being provided with a rocking and telescopic tube device; and a socket to which various soundboxes may be detachably secured, is supported by a weighted lever pivoted on the swinging arm. A T-shaped member c, Fig. 1, is adjustably clamped to a rod d secured in an horizontal position to the machine casing, and carries a rod e telescoping within its vertical arm. A telescopic horizontal arm f, g, mounted on vertical alined pivots 38 on the rod e, supports a post j carrying a lever l, n on screw pivots. An adjustable weight u on one side of the pivots balances the sound tube and sound-box q<1> on the other. An arm k clamped to the upper part of the rod j carries a socket, in which is fitted the upper portion b of the sound tube. The horn a, sound tube b, and arm f, g all swing about the pivots 38 as a record is being played. The lever arm n is secured to a sleeve 6, within which the tube p<1> can be adjusted and fixed by a screw 8 passing through a slot 9, Fig. 6. The upper reduced part of the sleeve 6 has a loose connexion, comprising a pin 10 and a larger socket, with a tube 5, the upper reduced end 4 of which slides freely in a socket 3. A conical tube 2, or an enlarged cylindrical tube, carried by the arm k, supports the socket 3 by horizontal pivots 14, 15. The tube p' can be turned through a right-angle within the sleeve 6 from the position shown in full lines in Fig. 1 to that shown in dotted lines, when changing from needle-cut to phono-cut records. The telescoping members c, d and c, e allow the arm n to be moved into the position required for the reception of the tube p<1> after adjustment. When a sound-box is used with the diaphragm facing the record, a straight tube is substituted for the curved tube p<1>. The sound-box may be raised off the record and supported by a bracket t, Fig. 4, pivotably connected to the post j. The arm n normally lies over a depressed part 61 of this bracket, but may be lifted and supported on the ledge 63. The vertical arms 60, t of the bracket limit the horizontal movement of the lever n and thus prevent the tube 4 from falling out of the socket 3. The horn support h is socketed in a bridge-piece i situated over the pivots 38 and secured by vertical bolts 35, 36 to the arm f. Through the upper end of the rod h passes a screw 27, from which is suspended an insulated spiral spring 29 carrying a slotted plate 25. A bolt secured to the horn passes through the slot in the plate 25 and is secured by a nut. The upper end of the support h may carry a transverse horizontal rod from which the horn is suspended. The rod may be adjustable longitudinally in a T-piece having a vertical pivotal connexion with the arm h. The joint shown in Fig. Q for mounting the rod f comprises a vertical pin 45 passing through the rod and bearing at its lower pointed end in a block 42 secured in the tubular rod e. The upper end of the pin 45 has a conical recess or projection coacting with a screw 38 adjustable in a removable block 39, which is secured by bolts 40, 41 to shaped plates 37 secured to the top of the rod e.