US1337692A - Telephone set - Google Patents

Description

APPLICATION FILED APR24| 1917- W. G. CRAWFORD.

TELEPHONE SET.

Patented Apr. 20, 1920.

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W. G. CRAWFORD.

TELEPHONE SET.

APPLICATION FILED APR. 24, 1917-.

1,337,692. Patented Apr. 20, 1920.

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Ven/0k.' .Wn/fer G. Crawford NTED STATES PTETNTI OFFCE,

YORK.

WALTER G. CRAWFORD, 0F NEW YORK, N. Y., ASSEGNO?, TO 1WESTERN' ELECTRIC COMPANY, INCORPORATED, 0F NEW' YCRK, N. 3.7

A CORPORATION OF NEW TELEPHONE SET.

Application filed April 24,

To all whom t may concern Be it known that I, ALTER Gr. CRAWFORD, a citizen of the United States, residingat New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Telephone Sets, of which the following is a full, clear, concise, and exact description.

This invention relates to telephone sets for use at the subscribers stations of telephone exchange systems, and particularly to telephone sets of the intercommumcating type. As a result of the different conditions under which intercommunicating telephone sets may be called upon to operate, there has been developed a large number of systems, and in many cases, the telephone sets for use in one system cannot be used in a different system without considerable modification. Not only do the different systems themselves necessitate diiferent sets, but in order to meet the requirements of a single system, a large number of different sets may be required, depending upon the number of sets to be placed upon a certain line, and whether these sets are to be of the flush or the non-flush type.

Such a condition makes it necessary to carry a much greater stock of telephone sets than would otherwise'be necessary and also results in a considerable increase in the cost of manufacture, and the cost kof handling` the orders. In order to decrease, to a large extent, the number of different sets needed to meet the requirements of the various systems, it has been found desirable to resort largely to unit type of construction, making the various parts interchangeable so far as possible, and in that way allowing for easily converting a set adapted for one system into a set suitable for a different system,

The object of this invention is primarily to provide a unit construction for such a set, one which will lend itself readily to the diHerent conditions under which it may be assembled, and which will be economical to manufacture.

To accomplish this object, the invention provides, in the first place. an apparatus mounting plate, upon which arepmounted the switchhook and the terminal plate, equipped with the necessary number of terminals to provide a flexible means for meeting the different circuit requirements. To facilitate the assembly, this plate is also Specification of Letters Patent.

1917. Serial No. 164,160.

provided with slots adapted to engage projecting lugs in the housing or cover plate of the set. There is also provided an opening in this plate for the mounting of the transmitter, so arranged that the transmitter and plate are clamped to the housing by the same screws. n

The various features of this invention will be more clearly understood by'reference to the accompanying drawings, in which- Figure 1 is a side elevation showing the method of mounting the apparatus plate, together with the transmitter, in the housing of the set, and also showing the housing mountedon its wall plate;

Fig. 2 is a view, looking into the back of the set, showing in detail the type of apparatus mounting plate provided; and to more clearly show this plate, the ringer has been taken away.

In Fig. 3 is shown the type of mounting plate proposed.

Referring more particularly to Figs. 1 and 2, there is providedv an apparatus mounting plate having a ring-shaped body portion S, and extended portions which are bent up, as shown, to provide mounting brackets 9 vand 10. These brackets have mounting surfaces in the saine plane, and are adapted for the mounting of the terminal plate 11,A which is of fiber or other suitable material. This terminal plate, which is held to the brackets by means of the screws 12, is equipped with suitable `terminals of a suiiicient number to provide ,a flexible means for connecting the circuit Awiring to meet the requirements of the various systems. On thev bracket 9 is also mounted a switchhook, which consists of the body portion 18, operating lever 14, and spring pile-up 15. As shown, the switchhook is adapted for use where the operating lever extends through the side of the case, and it is fastened to the brackets by means of screws 16, which pass through clearance holes in the bracket, and engage threaded holes in the body portion of the switchhook. Additional lugs 17, 17 are bent up at right angles to the face of the bracket 9, and are provided with mounting holes 18, 18, corresponding to those in the face of the bracket, and permitting` the mounting of the switchhook in a position displaced ninety degrees from the position in which it is shown. thereby making it possible to use the same mounting plate and the saine switchhooli for either the llush or the non-flush type of sets. On the ring portion of the plate are fastened a plurality of insulating segments 19 preferably of fiber or a similar material, and to these segments are fastened, by means oi the screws 20, spring members 21, which are adapted to bear against the transmitter capsule 22 and hold it in position against the back side of transmitter front plate 27, the inner diameter of the ring portion being of suitable dimension to allow the transmitter capsule 22 to extend therein. Since the spring members 2l are insulated from the mounting plate, the transmitter connection may be made directly to one of the spring members if desirable. Symmetrically located on the ring portion are the slots 23, which are of suitable dimensions to engage the lugs 24 on the housing 25, and to holdy the apparatus plate in position. lt is then secured by means of the screws 26 passing through the front plate 27 or" the transmitter, and engaging the threaded Vholes 28 in the apparatus mounting plate, lthereby locking the parts together:

It will be noted that, with this construetion, the transmitter is removable from the front, Vthereby permitting a more compact arrangement of the apparatus within the housing than would otherwise obtain. Moreover, the other apparatus is not disturbed by the removal of the transmitter, and the same screws which are used to hold the transmitter in place also secure the apparatus mounting plate.

Referring now more particularly to Fig. 3, there is provided a mounting plate 2S) which is adapted to be secured to the wall by means of screws passing through the mounting holes 30. An opening 31 is provided through which to bring the wiringi'or the set, and recessed portions 32, 32 are also provided at the top and bottom of the plate as alternative openings for the wiring. The

lower portion of the plate is formed asY shown to provide brackets 33, 33, each of which is provided with an opening or slot 34. On the lower part of the housing are the lugs 35, 35 of suitable dimensions to engage the slots 34, and to serve as a support for the housing while the connections are being made in the interior wiring or the apparatus itself. As a means for securing Leer/,eee

the housing to the mount-ing plate, rightangled brackets 36 are formed in the'latter, these being provided with threaded holes 37, adapted to be engaged by the -screws 33 passing through the sides of the housing These screws are provided with split washers 39 to prevent their falling out when not in use. A U-shaped guide 40 is provided tor the wiring to the set, which is preferably run in cable form. For the sake of clearness, this wiring is not shown in the drawings.

What is claimed is:

1. In a telephone set, the combination with a housing having an opening therein. of an apparatus mounting plate located within said housing and comprising a ilat body portion having an opening therein adapted to register with the opening in the housing, a transmitter iront plate mounted external of the housing, and a transmitter capsule mounted within said openings and held under pressure against said transmitter front plate. v

2. In a telephone set, the combination with a housing having an opening therein, of an apparatus mounting plate located vWithin said housing and-comprising a `flat` body portion having an opening therein registering with the opening in the housing, a transmitter front plate mounted external oit the housing, a transmitter capsule mounted within the housing and extending within said openings, and a plurality of spring members mounted upon and insulated from said mounting plate adapted to-hold said capsule in position against the rear wall of the transmitter iront plate, whereby said capsule may be removed `from the front upon removal ofthe transmitter front plate.

3. In a telephone set, a mounting plate comprising avila-t body portion having an Y opening suitable for-mounting a transmitter, abent up extension on said plate provided with means for mounting a switchhook, and lugs formed on said extension and at right angles theretoadapted to provide an alternative means et securing said switchhook in a position at right angles to said other position. Y

In witness whereof I hereunto subscribe my name this 20th day of April A. D., 1917.

WALTER e. onAwroi-m,

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