US835361A - Telephone-receiver. - Google Patents

Description

PATENTBD NOV. 6, 1906.

C. T. MASON.

' TELEPHONE RECEIVER.

APPLIOATION FILED MARJ. 1906.

INVENTOR ll-lllllllll W1 TNESSES Aizameyl.

Tu: NORRIS PETERS co.. WASNINCYON. D. c.

CHARLES T. MASON, or SUMTER, SOUTH CAROLINA, AssreNo-R roa'rmi SUMTER TELEPHONE MANUFACTURING CAROLINA, A CORPORATION.

COMPANY, OF SUMTER; SOUTH TELEPHONE-FIECE TVE R Specification of Letters Patent. v Application filed March '7, 1906. Serial No. 304.674.

Patented me. e, iota To all whom it may concern.-

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 useful Improvements in Telephone-Receivers, of which the following is a specification.

This invention is a telephone-receiver having for its chief object to produce a complete and operative receiver, the assembly, adjustment, and operation of which are entirely independent of the hard-rubber or composition casing. The magnet structure is associated I with and connected to the coils and diaphragm in such manner that these parts are independent of the casing and are operated with or without the same. A special feature of the invention is a metal cap, which screws on the cup and clamps the diaphragm to the front end thereof, the cup being firmly secured to the magnet structure. The cap has the further feature that it protects the diaphragm from punching with a lead-pencil or other instrument.

A form of the invention is illustrated in the accompanying drawings, in which Figure 1 is a sectional view showing the cap, the interior or magnet structure, and the casing in separated condition. Fig. 2 is a sectional view of the same parts assembled, the section being at a right angle to that shown in Fig. 1. Fig. 3 is a plan view of the metal cap which clamps the diaphragm to the cup.

Referring specifically to the drawings, a indicates the ear piece, which screws on the hard-rubber or composition casing is. The diaphragm is indicated at c, and it is clamped to a cup d by means of a metal cap I), which screws onto the rim of the cup. The cap B fits within the rabbet in the earpiece a, formed to receive it, and when assembled the cup (1 fits within the front end of the casing is with its rim against the end of said casing, and the parts are all clamped together by the screw-threaded engagement of the earpiece and the casing. The pole-pieces e are fastened securely in a plate Z, which is secured to the bottom of the cup by two screws 9, which also clamp the coils f in place by extending through perforated ears formed on the end plates f of the coils. This allows the coils to be readily removed and replaced.

The pole-pieces are clamped onto the end of the horseshoe-magnet 'i by means of a bolt h, which also clamps the fiber-block m between the ends of the magnet; The cord terminals j are secured to the fiber-block by screws j.

The plate Z encircles the pole-pieces e, and when the plate is screwed down to the bottom of the cup the lugs e on the edges of the pole-pieces come against the bottom of the cup. The pole-pieces are very tightly fitted into said plate Z, and when the parts are screwed together the cup and the diaphragm and coils are rigidly mounted upon and se cured to the magnet structure. This forms an operative receiver entirely independent of the casing. In fact the casing can be removed without affecting in any manner the operation of the parts, the metal cap I) answering the purposes of an earpiece. Consequently the parts may be assembled and adjusted before they are put in the casing, and they remain at adjustment independent of any manipulation of the casing. Consequently unscrewing or tampering with the earpiece at the hands of inexperienced persons, will not affect the operation of the receiver.

The metal cap I) is preferably provided with a ring of holes p, the diameter of which ring is greater than that of the hole in the earpiece, so that the former lie beyond the latter, and punching the diaphragm with a lead-pencil or the like is prevented and it is impossible to reach the diaphragm from the outside. However the cap may, if desired, be provided with a single hole opposite the hole in the earpiece, or the cap may have a single hole and the earpiece have a ring of holes, reversing the construction first mentioned.

The construction shown facilitates manufacture, test, and adjustment of the receiver and provides a construction proof against ordinary tampering after the telephone is set up.

I claim 1. In a telephone-receiver, the combination of a magnet having pole-pieces, a cup at the front end of the magnet and through which the pole-pieces project, coils upon the pole-pieces, within the cup, a casing upon the front end of which the rim of the cup rests, a diaphragm upon the cup, a perforated cap screwed on the rim of the cup and under upon said plate, and screws extending through which the diaphragm is clamped, and an earthe end pieces of the coils and the plate into piece which is screwed onto the casing, over the bottom of the cup. the cup and cap. I In testimony whereof I have signed my 5 2. In a telephone-receiver, in combination, name to this specification in the presence of I5 a on supported in the casing at the front end two subscribing witnesses.

of t e magnet and through Which the pole- CHARLES T. MASON. pieces project, a plate which fits in the bot- Witnesses: tom of the cup, around the pole-pieces, coils F. C. MANNING,

10 on the pole-pieces in the cup and mounted MURT HALL.

Images