US670564A - Telephone-receiver. - Google Patents

Description

Patented mar. 2s, |904.

n c. H. Nonni.

TELEPHUNE RECEIVER. (Applxcatxon led Sept B 1899 (No Modul.)

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VNrrED STATES "AIENT ENCE.

CHARLES H. NORTH, OF CLEVELAND, OHIO, ASSIGNOR TO THE NORTH ELECTRIC COMPANY, OF SAME PLACE.

TELEPHONE-Receives.

SPECIFICATION forming part of Letters Patent No. 670,564, dated Meren 2e, 1901'.

Application filed September 27, 1899. Serial No. '781,798- (No model.)

T a/ZZ when?, t may concern.-

Be it known that LOHAELES H. NORTH, a citizen of thenited States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented a certain new and useful Improvement in Telephone Receivers, .of which the following is a full, clear, andexact description, reference being had to the accompanying drawings.

The object of my invention is to provide a telephone receiver, which while being simple and cheap in construction,shall, first, minimize the disadvantages resulting from the different rates of expansion of the material comprising the receiver; second, shall be conveniently adjustable to regulate the distance between the magnet-poles and the diaphragm, and, third, shall have no exposed binding-posts. l l

The invention consists in the means I employ for attaining these ends or material parts thereof, as hereinafter specified, and

definitely set out in the claims.

The drawings clearly disclose my invention.

Figure 1 is avertical central section of the receiver complete. Fig. 2 is a side elevation of the interior of the receiver, and Fig. 3 is a vertical central section at right angles to Fig. 2. Fig. 4. is a perspective View of the electromagnets and the brass block which holds them in place. Figs. 5 and 6 are horizontal sections, respectively, on the lines 5 5 and 6 6 of Fig. 2. Fig. 7 is a top view of the interior of the receiver, the diaphragm being partly broken away.

Referring to the parts by letters, A represents the body of the casing, preferably made of hard rubber, and B the cap therefor, which screws onto the outside of the body by the internal threads b.

C represents a frame which is preferably a brass cup or cone-frustum having a flange c taking over the upper end of the body A. This flange has external threads c', which mesh with the threads b on the cap B. Extending across the mouth of` the cup, between it and the cap, is the'diaphragm D.

The permanent magnet is preferably a single horseshoe-magnet, or, if desired, two inform of a mutilated cylinder having two opposite sides which are screw-threaded, as at g, but between them being recessed, as at g. The recessed part lies between the bars E E, while the screw-threaded part projects over beyond the edges thereof. A screw-bolt II clamps the block, the electromagnets, and

the permanent magnet all together by screwing through one barE and through the intermediate parts into the other bar. The cup C screws onto the block G by reason ofthe threads g thereon and internal threads on a flange c2, depending from the cup. A pair of jam-nuts J and J' also screw onto the block G and lock each other and the cup C. This method of supporting the magnet reduces to a minimum the disarrangement of the parts by unequal expansion or contraction. The difference in expansion between the cores F and the cup C (these being the parts which are factors in the`result) is insignificant, while if the magnet were supported at its lower end by the rubber casing, as has been customary, the dierent rates of expansion between the steel and rubber are sufficient to be very annoying.

The receiver is easily adj usted to the point of greatest efficiency. The casing A is unscrewed from the cap B, and the jam-nuts J and J loosened, and the cup C turned in one direction .or the other, as required, (thus moving the diaphragm toward or from the magnet-poles,) and is then locked by the j am-nuts. Since the cup C is screw-threaded to the cap, the removal of the casing A does not in the least interfere with the electric operation of the receiver, and the latter lnay thus be adjusted by sound, which is much more aecurate than by measurement.V

By making the external diameter of the cup C the same as that of the head of the casing A the thread b on the cap is made continuous, which is not only the simplest and cheap- IOO est form, but allows the casing A to abut against the flange c of the cup, and thus act as a jam-nut for it.

The ends of the coilf of the electromagnets are secured to insulated wires K, which pass down through a pair of longitudinal holes g2 in the block. G. At their lower ends these wires are secured by screws L (which take into an insulating-block M, held between the bars E) to the two ends of the flexible cord N. In order to prevent a sudden shock on the cord from pulling it loose from the screws or from dslocating the latter, the two ends of the cord cross over from one side of the block onto the other through the opening 'm therein. The two ends come together beneath the magnet and pass out of the casing through the opening a as one cord.

By making the connection with the flexible cord entirely within the casing a very neat appearance is given to the receiver, and, moreover, the possibility of a shock from an accidental contact with exposed binding-posts or the accidental disconnection of the cord therefrom is obviated.

I claim- 1. In a telephone-receiver, in combination, a casing-body, a cap secured to the same, a cup within the casing having a projection extending between the cap and body, a diaphragm between the cup and cap, and a magnet carried by said cup and adjustable with reference thereto, substantially as described.

2. In a telephone receiver, a horseshoemagnet, a cup supporting said magnet, and adjustable along it by reason of screw-threads, a diaphragm extending over the mouth of the cup, said cup having a peripheral flange,combined with a casing consisting of a body and a cap screwing thereonto, said peripheral flange extending between said cap and body and being clamped thereby, substantially as described.

3. ln a telephone-receiver, a casing consisting of a body and a cap adapted to be secured directly thereto, a cup wit-hin the casing screwing into the cap, whereby said cup is held by the casing and entirely inelosed within it, combined with a diaphragm between the cup and cap, and a magnet carried by the cup, substantially as described.

4f. In a telephone-receiver, acasing consisting of a body and a cap screwing directly thereonto by reason of internal threads on the cap and external threads on the body, a cup within the casing having a flange extending between the cap and body and having screw threads on its exterior, said screwthreads being adapted to form a continuation of the screw-threads on the body whereby the same internal threading on the cap may mesh with both the cup and body, combined with a diaphragm between the cup and cap, and a magnet carried by the cup, substantially as described.

5. In a telephone-receiver, in combination, a cup having' a fiange screw-threaded on its exterior and an opening through it screwthreaded on its interior, a horseshoe-magnet carrying a screw threaded block engaging with said interior screw-threads whereby the cup adjustably supports the magnet, a cap screwing onto said cup, a diaphragm between said cap and cup, and a casing-body having external screw-threads and screwing directly into said cap, whereby said cup is entirely inelosed within the cap and bodyand clamped thereby, substantially as described.

6. In a telephone-receiver, a pair of magnet-bars E, an insulating-block M between the same, said block having an opening fm, a double flexible cord dividing and passing onto opposite sides of said block and passing through the opening m in opposite directions,

electromagnets carried by said bars E, and

conductors leading therefrom to opposite sides of' said block and there secured to the flexible cord, in combination with a diaphragm which said magnets are adapted to operate, and an insulating-casing inclosing the parts and having an opening through which the flexible cord extends, substantially as described.

7. In a telephone-receiver, the combination with a frame, a diaphragm in contact therewith, and a magnet carried by said frame, of a cap detachably secured to said frame and a shell detachably secured to said cap, the cap and shell inclosing the other parts, substantially as described.

8. In a telephone-receiver, the combination with a frame, a magnet adjustably mounted in said frame, and a diaphragm, of a cap detachably secured to said frame and arranged to hold the diaphragm to the frame', and a shell detachably secured to the cap, substantially as described.

9. In a telephone-receiver, the combination with a frame, a magnet provided with a head screw-threaded into the frame, and a diaphragm in contact with said frame, of a cap screw-threaded onto said frame and inclosing the diaphragm, and a shell screw-threaded onto the cap and inclosing the magnet, substantially as described.

lO. In a telephone-receiver, the combination with a hollow cone-frustum frame having an interior screw-threaded portion at its smaller end and an exterior threaded portion at the larger end, of a diaphragm in contact with the end surface of the large end of the frame, a magnet provided with a magnethead having a screw-thread engaging the interior screw-threads in the magnet-frame, a cap provided with screw-threads engaging the exterior screw-threads of the frame, and a shell inclosing the magnet and provided with screw-threads engaging the cap, substantially as described. Y

ll. In a telephone-receiver, the combination with a frame, a magnet having a head screwed partly into said frame, and a locknut on said head and arranged to engage the frame, of a diaphragm, a cap detachably se- IOO IIO

cured to the frame and inclosing the diaphragm, and a shell detachably secured to the cap and inclosing the magnet and locknut, substantially as described.

l2. In a telephone-receiver, the combination, with a pair of magnet-legs, a diaphragm, coils, and means for holding said magnetlegs, coils and diaphragm in proper relation to each other, of a filling-piece between the ,legs of the magnet and provided with a trans-v verse opening, a pair of conductor-cords in electrical communication with the respective terminals of the coils, said conductor-cords being interlaced through the opening in the filling-piece, and a shell arranged to inclose the magnet, coils and lling-piece and provided with an opening through which the conductor-cords pass to the outside, substan. tially as described.

13. In a telephone-receiver, the combination with a magnet, coils and diaphragm, and means for holding them in their proper relation to each other, of binding-posts mounted in fixed relation to the coils and connected to the terminals thereof, a pair of conductorcords, means for making an electrical connection between the electrical conductors of the conductor-cords and the said vbindingposts, means for securing the cond uctor-cords to the receiver, and a shell inclosing the magnet, coils, binding-posts and securing means and provided with an opening through which the conductor-cords extend, whereby the receiver may be suspended from said cords Without straining the electrical conductors Within the conductor-cords or the binding-posts, substantially as described.

In testimony whereof I hereunto ax my signature in the presence of two witnesses.

CHARLES NORTH.

Witnesses:

H. M. WISE, ALBERT H. BATES.

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