US823061A - Telephone-receiver. - Google Patents

Description

PATENTED JUNE 12, 1906.

0. T. MASON. TELEPHONE RECEIVER.

APPLICATION FILED MAR.17. 1905.

WITNESSESi I INVE/VTUR J I It UNITED 7 CHARLES T. MASON, OF SUMTER,

- SUMTER TELEPHONE MAN UF SOUTH CAROLINA.

SOUTH CAROLINA. ASSIGNOR To AUTURING COMPANY, OF SUMTER,

' TELEPHONE-RECEIVER.

Specification of Letters Patent.

Patented J'une 12; 1906.

Application filed March 17. 1905. Serial No. 250,624.

To all whom it mag concern: I

Be it known that I, CHARLES T. MASON, a citizen of the United States, residing at Sumter, in the county of Sumter and State of South Carolina, have invented new and use- 1 Improvements in Telephone-Receivers, ofwhich thefollowing is a specification.

This invention is an improved telephonereceiver characterized by the fact that the magnet structure is molded in a soft-metal section which is screwed and cemented at adjustment in a cup forming part of the receiver-casing, whereby the magnet'is held rigidly therein, the casing being completed by a removable cap, which also clamps the dia hragm, and a removable handle or shell.

15 further novel feature is embodied in means for removably supporting the coils and for connecting the same to the terminals of the receiver-cord.

In the accompanying drawings, Figure 1- is a central longitudinalsection of the receiver u rhandle section C. The section B sup the casing.

-block '11,- clamped between t with the parts assembled. Fig. 2 is a front end view with the ear-cap and diaphragm removed. Fig. 3 is a sectional view of the magnet structure. .Fig. 4 is a perspective view of one of the coils.

Referring specifically to the drawings, B

indicatesa combined cup and'casing section made of rubber or other composition. This cup B is eXteriorly threaded at the front end to receive the screw-cap A, by which the diaphragm a is clamped to the front end of the c The casing is completed by the rear 0 orts the magnet structure and forms a rigl and .permanent union therewith and avoids the necessity for separate cu and casing sections, since it forms both t e cup and part of The magnet structure comprises the horseshoe-magnet y' and the poleieces b and fiber e front ends of the magnet by a bolt f, and said fiber piece carries the terminals 15., to which the receivercord 7:. isattached, the terminals "being held by binding-screws I, which are connected by the like having a low wires 1 to the coils. Around. the magnet structure is molded a block 6, of soft metal or fusing-point, said magnet structure being thereby rigidly fixed therein. The block e is exteriorly threaded and is screwed into and through the bottom of the cup B, thereby having a projecting portion G, onto which the handle C is screwed.

In assembling the parts a small space 1) is left between the ledge at the front end of the block e and the bottom of the cup to allow of the adjustment of the magnet structure to bring the pole-piece inproper relation to the face of the cup, and consequently to the diaphragm. This space is filled by a suitable ce ment, which also enters between the threads. While the cement is soft such adjustment as is necessary may be made, after which the cement sets and hardens and holds the magnet structure in permanent adjustment. The

coils c are removably held on the pole-piece in the cup, the lower end plate of each coil havin a perforated ear to receive a screwk to hold the coil upon the block c. This block hasv holes h for the connecting-wires. The screws 1 allow the coils to be disconnected and removed without unsoldering any wires. This is advantageous when the coils have to be replaced for any reason, as when burned out.

It is desirable in receivers to have the magnet structure rigid with the casing. This is conveniently effected by the invention herein shown, because the ma et structure is molded in the block 6, and t is block becomesrigidly fixed to the casing-section B by screwing and cementing therein, and the block also serves to hold the handle and cup together. t I claim as new, and desire to secure by Letters Patent, is'

In a telephone-receiver, the combination with a magnet structure, of a threaded blockv molded around the front end of the magnet and the rearends of the pole-pieces, and having a shoulder around its front end, a cup section forming the middle part of the casing and in which the block is screwed, lea a space between said shoulder and the bottom of the cup, in which space cement is placed to permanently fix the block in the cup, coils on the ole-pieces, having terminals which extend t 011 hholes in the block, and a hendle which incloses the rear end of the magnet structure and is screwed 0n the rear end of the block.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES T. MASON.

Witnesses:

C. G. ROWLAND, MART HALL.

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