Patent GB-190307966-A (GB)
Title: Improvements in Telephonic Apparatus.
Inventor: GRAHAM ALFRED
Filed: 1903-04-06
Granted: 1904-03-17
Abstract: 7966. Graham, A. April 6. Telephones; telephone systems ; telephone calls.- Relates to a water-tight casing containing a telephone receiver and transmitter, with contacts normally made for the calling-circuit, and throwing in the receiver and transmitter when the casing is moved into the position for use. The arrangement can be used at any azimuth, or by persons of any height, without obstructing the view, and is described as applied on board ship. Fig. 2 is a vertical section through the apparatus in the normal position, Fig. 5 shows the corresponding electrical connections, and Fig. 13 the switch mechanism for inter-communication with several other stations. The cylindrical casing c contains the transmitter a and receiver b and is mounted on the fixed sound tube d, which is flanged at one end k, and extends through the boss o of the casing on the other. The boss rotates in a bearing in the part e<2> of the U-shaped hollow holder e<2>, e, e<1>, which carries at the opposite side a disc m, round which the casing can rotate, the joint being made water-tight by a packing-ring n of cotton wick impregnated with tallow. Of the two ear tubes g, h, the former is attached to the boss of the casing and has a tube w projecting within the sound tube d, while the other communicates with the sound tube by a passage 2 through the ball-and-socket joint 1, both tubes having india-rubber washers 4 on the ear-pieces i. A spring 5 returns the casing to the position shown. The holder has a cap r, which can rotate through a large angle about the top of the pillar f, the motion being limited by stops u moving in slotted arcs v, and has also packing l placed outside antifriction balls s. Motion of the ear-tube g will thus rotate the casing into a convenient position, and with it the receiver a, which is of the type described in Specification No. 591, A.D. 1898, and is protected by a perforated plate 8, the receiver b, which is of the type described in Specification No. 18,806, A.D. 1898, remaining stationary meanwhile and being always in communication with the ear-tubes by the extension d<1> of the sound-tube upon which it is mounted. The movable plate q gives access to the receiver. Connections are made to five spring contacts 11, 12, 13, 14, 15 and the terminals 16, 17, all upon the insulating-bar 19 secured to a boss 21 in an external extension d<2> of the sound-tube and with these contact the metallic strips 23 and 24, 26<a> upon the insulating-disc 25 attached to the casing. A battery 32, a ball 30, two linewires 27<a>, 28<a>, an earth-connection E, and a calling-push 33, 34, 35 are employed, and, in the normal position shown, by closing the push, the battery is connected to earth and to the line-wire 27<a> in order to call, while a calling-current passing along the wire 28<a> passes from the contact 15 by the strip 24 to the contact 13, and thence through the ball to earth. On bringing the telephone into use, the bell con nections are thrown out and the receiver and transmitter brought in, the wires 28<a>, 27<a>, respectively, being used for them, with earth-return. The leads from the spring contacts pass through holes in the side of the holder and disc m, and are brought to terminals 39, whence other leads pass into the pillar f ; but, in a modification to allow of complete rotation of the holder upon the pillar, the former may have collecting- rings in the circuits, with spring-contact pieces, fixed in position on a disc within the pillar and spring-pressed upwards against the rings. For the purposes of communicating with one of a number of similar apparatus, a cam 76 is pivoted on a spindle 46, operated by an external handle, and the circuit is, normally, completed from a linewire 28<c> through the contact blade 71<c>, the contact 73<c>, and the annunciator 59<c> illuminated by a lamp 75, to earth through the bell 30. When the cam is rotated to the position for the calling-station, the spring blades will place the line-wires 27<c>, 28<c> in series with the leads 27, 28, and the instrument may be operated, as before. Means for restoring the annunciators are provided.