US655726A - Telephone-receiver. - Google Patents

Description

No. 655,726. Patented Aug. I4, |900. W. J. MURDOCK.

TELEPHONE RECEIVER.

(Application led Apr. 11, 1900.)

(No Model.)

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IVILLIAM J. MURDOOK, OF BOSTON, MASSACHUSETTS.

TELEPHONE-RECEIVER.

SPECIFICATION forming part of Letters Patent No. 5,726, dated August 14, 19010. Application tiled April l1, 1900. Serial Ilo. 12.4.56. (No model.)

T0 all whom t may concern:

Be it known that I, WILLIAM J. MURDocK, a citizen of the United States, residing at Boston, in the county of Suifolk and State of Massachusetts, have invented a new and useful Improvement in rlelephone-Receivers, of which the following is a specitication.

My invention relates to a telephone-receiver or similar device in which the material of the shell, body, or casing is molded or cast about the magnet or other partse-as, for example, the binding-post sockets or the posts themselves or the suspending hook or ring` of the receiver or device.

It is the ordinary method to Iirst form the body, shell, or casing of the receiver and then to place the magnets, hooks, binding-posts, dac., therein. This method is objectionable because it necessitates making the insulating or body portions of the receiver in several parts, and each such part requires a separate molding or forming operation. Then, again, the work of assembling the many parts is laborious, slpw, and expensive. Another great disadvantage of this method lies in the fact that the best and most reliable construction is not obtained. The detachable and auxiliary retaining means, which usually consist of blocks of rubber and are ordinarily held in place by screws, are liable to work loose, the binding-screws or other parts held by screws are apt to pull out, and a defective and objectionable instrument is the result. By my invention, however, I arneiibled to form the whole instrument at one operation, the shell, body, or case being molded or cast about all or as many of the other parts as desired. The parts are thus all secured, bound, and held in place by the material of the case, all retaining lugs or portions being formed This method dispenses with the various tedious and expensive operations mentioned above, thus securing both a better and a cheaper article.

In the accompanying drawings, which show several embodiments of myinvention and in which the same reference characters are applied to corresponding parts throughout the several views, Figure 1 is a plan view of a Watchcase-receiver with the cap and diaphragm removed and embodying my invention. Fig. 2 is a sectional view of the same Fig. 5 is a sectional view on the line c c ot' i Fig. 6, showing the invention applied to an ordinary Bell receiver, and Fig. 6 is an end view of the same. Fig. 7 is a sectional view taken through one ot the binding-posts 7 and showing the socket into which the binding-post is screwed.

The watchcase-receiver shown in Figs. 1

and 2 consists of a shell or case 2 of the ordinary shape and size. Within the same is a magnet 3, which may be the usual permanent magnet in instruments of this class and to which are attached by screws 4. the soft-iron pole-pieces 5. On the latter are placed the coils or spools of wire which cause the diaphragm to vibrate during the use of the instrument. In practice the coils of wire are connected together and thc other ends of the coils are soldered to thin `oblong washers, through which binding-posts '7 pass to mechanically and electrically connect them to the sockets 8 of the binding-posts. This feature, however, is omitted from the drawings for the sake of clearness, as it forms no part of my present invention. On the inside of the shell or casing arecast or molded integral therewith the projecting portions G. In these figures this portion 6 does not extend entirely around the inside of the shell, but is lacking at the points 9, so that the pole-pieces 5 may be readily attached or removed. The parts 6, however, are of sufficient proportions to firmly bind and hold the ring-magnet 3 in The projections 6 in the or'-` proper position. dinary watchcase-receiver are separate and removable and are held in place by screws. In constructing this receiver the magnet vis properly supported in any suitable way in the mold and the material of which the shell is composed is molded or cast about it, thus forming .the projecting and retaining lugs G integral with the other parts of the shell. The pole-pieces 5, carrying the spools of wire, are then placed in position and the receiver is Aready to be connected up. The receiver is of course supplied with the usual'diaphragm lO and cap 11.

In the modiiication of my invention shown IOS in Figs. 3 and 4, which is a watchcase -receiver of the same general type as the former, the retaining and binding portions 6 extend entirely around the inside of the shell or case, as will be apparent by a reference to Fig. 3. This is considered a desirable embodiment of my invention, as neither the ring-magnet nor thc soft-iron pole-piece can work loose or out of adjustment after the receiver is once i connection with socket-head 14.

formed. It necessitates, however, attaching the pole-pieces to the magnet 3 before the shell iscast about the same. When this manner ot making the receiver is employed, the spools or coils of wire are necessarily slipped on over the pole-pieces after the receiver is formed, while in the construction formerly described the coils were Wound directly on the pole-pieces. This general mode of construction may also be applied to the ordinary Bell receiver as readily as to watchcase-receivers. One of this style so constructed is shown in Figs. 5 and 6. AHere themagnet is indicated by 5 andthe pole-pieces on which the coils are Wound by `5", while the diaphragm and cap are shown of the usual construction and arrangement. The method of making the device is the same as in the prey coils of wire are formed separate from the pole-pieces and are slipped on afterward when it is desired to complete the receiver.

In instruments of this class difficulty has arisen in rmly securing the binding-posts, as the material of the case is not well adapted for the holding of screws. In my invention I avoid this difficulty by providing sockets for the binding-posts having enlarged heads or ends which are also molded or cast into the material of the shell in the process of forming the latter. One way of doing this is indicated in Fig. '7, in which the bindingscrew 7 is shown inserted into an internallyscrew-threaded socket 8, the latter being proment.

vided With an enlarged hexagonal head or end 14, around and over which the material of the shell is formed in molding. A hole 15 is also formed in the case, which extends to and into the hexagonal head of the socket. In the use of the instrument4 the bindingscrews 7 connect the coils with the sockets 8 and the usual receiver-cord plug-terminals are inserted in the holes 15 to make electrical It will be observed that a strong binding-post attachment is thus secured, as kthe portion 8 may be readily screw-threaded and the socket cannot pull out on account of the head 14 being embedded in the shell. Itis to be understood, of course, that the posts 7 may themjselves be molded in the shell without the socket S butI prefer the latter construct-ion. The same posts may be applied to the receiver ot' Fig. 5 or, indeed, to any electrical instru- The ring 16, Figs. 1 to 3, is attached to the shell in the same way, and the result is a complete receive-r, which is cheaper to manufacture and better than those ordinarily in use.

The invention is defined in the following claims:

l. A telephone-receiver comprising in its structure a shell or case of insulating material and a magnet for operating the diaphragm, the shell or case being provided with integral retaining portions projecting over and about the magnet, whereby thel same is rigidly supported and held within'the case.

2. In a telephone-receiver, the combination of a s-hell of insulating material, a magnet, binding-posts, and a suspending hook or ring, the shell being provided with integral retaining portions extending over andaabout the several metallic parts whereby the same are irml y held in place.

3. In a telephone-receiver, the combination of a shell of insulating material, a magnet having poles to influence the diaphragm, binding-post sockets having enlarged heads, and a suspending hook or ring, the shell being provided With retaining portions integral therewith whereby all other parts are firmly and permanently secured within the shell.

WILLIAM J. MURDOCK.

Witnesses:

FREDERICK B. HILL, RoBT. L. AMES.

IOO

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