US1563375A

US1563375A - Glow-discharge transmitter casing

Info

Publication number: US1563375A
Application number: US637052A
Authority: US
Inventors: Louis F Kindermann
Original assignee: Westinghouse Electric and Manufacturing Co
Current assignee: CBS Corp
Priority date: 1923-05-07
Filing date: 1923-05-07
Publication date: 1925-12-01
Anticipated expiration: 1942-12-01

Description

Dec. 1 1925. 1,563,375

L. F. KINDERMANN GLOW DISCHARGE TRANSMITTER CASING Filed May '7, 1923 v INVENTOR Lou/s F/(mdermann.

ATTORNEY WITNSSES:

Patented Dec. 1, 1925.

LOUIS F. KINDERMANN, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WESTING- HOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION VANIA.

or PENNSYL- GLOW-DISCHARGE TRANSMITTER CASING.

Application filed May 7,

Z '0 all whom it may concern:

Be it known that I, LoUIs F.1{INDER- MANN, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Glow-Discharge Transmitter Casings, of which the following is a specification.

My invention relates to telephone systems and apparatus, having particular reference to the mechanism required for sound wave translating devices.

Broadly speaking an object of my inven tion is to provide a protecting and supporting casing for a telephone transmitter ol" the glow discharge type.

An object of my invention is to provide a casing for the support and protection of glow discharge telephonic transmitter which will give adequate reception of sound waves and which will also provide for the support and protection of necessary resistance and control units required for the charge.

A further object of my invention is to provide for the attachment of leads and terminals and to furnish protection against the influence of nearby high power radio frequency electrostatic and magnetic fields.

In the co-opending application of P. Thomas, Serial No. 600,822, tiled November 1 1, 1922, for improvement in glow discharge transmitters, there is described the principle of operation and the essential structures for applying that principle whereby a glow discharge is made to serve as a telephonic transmitter. It is desirable for the best operation of this device that the electrodes between which the glow discharge is maintained-be supported in a detachable structure, which in turn is desirably supported in a casing which will also support the resistance and control elements and the terminal and connector structures. sirable that the casing have a metallic shield to protect the various elements of the glow discharge transmitter from the influence of nearby electrostatic or electromagnetic fields which may sometimes be encountered when the transmitter is used in the neighborhood of a high power radio transmitting station.

In the practice of my invention, I provide a block of maple wood or other suitable insulating material in which suitable recesses glow dis- It is also de- 1923. Serial No. 887,052;

are cut for the various elements required to make up the transmitter, assembly. This maple block serves forboth insulation and support. It is surrounded by a metal case and cover which'are grounded. The metal case and cover form the necessary shield 'for protection against the previously mentioned electrostatic and electromagnetic field.

Other objects and applications of my invention, as well as details of construction will be apparent from the following description when taken in connection with the accompanying drawings, wherein- Figure 1 is a front view of my apparatus, and

Fig. 2 is a central vertical section thereof.

In Fig, 1, 1 is a. maple block in which there is a recess for holding the glow'discharge capsule 2 and also recesses for its supporting and connecting clips 3, 4 and 5. Other recesses are provided as shown for resistance rods Gland 7 Channels are prorided for connecting wires 8, 9 and 10;

All these openings are made by drilling through the body of the block and plugging the unnecessary parts of the drilled holes with maple or other suitable material. Additional openings are provided for

clips

12 and 13 and for the shielded

cables

14 and 15 and also for anchoring clips 16 and 17. The clip 17 is connccted'as shown at 2-6 in Fig. to the case 18. I 'l desired, the clip 16 may also be thus connected but it is un necessary to connect both clips because the metallic outer covers of the

wires

14 and 15 are connected at a point outside the figure.

A metal shielding case 18 is'l'irovided sur- 1 rounding the run and back of the block 1.

A wooden cover 19 shown in Fig. 2, is also provided which extends slightly beyond the block 1 so as to bring its circumferential surface flush with the outside of the case 18. It. is covered with a. metal shield 21. A group of holes 22 are provided passing through the maple block from the opening in which the glow discharge capsule is supported. These holes are protected at their front ends by a felt pad 23. An inlet open-- ing in the cover is shielded with a light fabric covering 24, this shielded opening allowing sound wavcs' to enter the transmitter and affect the glow discharge. The various screws and fastenings as shown.

In assembling the device, the wires 8, 9 and 10 are inserted in their respective ducts and connected to the several clips at the same time that the latter are fastened to the block by screws. recess and the projecting ends ol' it-s electrodes eo-operate with the clips 3, 4: and 5 to hold the cell in place and also establish the connections. The wires Li and 15 are then inserted in the

clips

12, 13. 16 and 17, the

clips

12 and 13 providing the connections to the wires and the clips 16 and 17 providing connections to the metallic covering on the outside of said wires. The insertion of resistances 7 and S completesthc set and the cover 19 is then' put in place. The shield 2t is secured to the cover by the screws fastening the fabric 24 in place and is put on to the device at the same time as the cover and by frictional contact with the case 18 holds the cover on.

In operation, this device makes it-convenient to prepare the transn'iittcr. for the reception of sound, and give it the necessary support and protection. The clip also permits ready removel or insertion of lead wires 14: and 15 and of resistances 'Tand 8. The glow discharge capsule is likewise held in spring clips which provide convenient means for its removal and replacement by other glow discharge capsule.

The rear end of the glow discharge capsule is protected by :1 padding of felt .23 which is likewise held in proper operative relation by the construction of the device. The group of holes 22 serves to provide protection against sounds which might enter the rear end of the glow discharge capsule. The front of the glow discharge capsule 2 is protected against dust and other objectionable. infiuences such as drafts by the light fabric 24 which is also held in position by the device. The casing shield 18 and cover shield 21, which are integral parts of the device, are of metal and are connected to the Qltltlll'llttl conductor covers LL and 15, thus. il'orniing a shield which is essential for protection of the glow discharge from electrostatic and electromagnetic influences which may be produced by outside sources.

By the construction as above described and by modifications thereof which will readily be apparent: to those skilled in the art, it is possible to provide asu porting and insulating structure for the glow discharge capsule which will maintain it in operative relation with the necessary circuit parts and also protect it against undesired influences such as dust, extraneous sounds and electrostaticand magnetic fields.

While I have shown only one embodiment of my invention in the accompanying drawings, it is obvious that many changes and modifications may be adopted without de- The cell 2 put into its.

parting from thespirit thereof. It is desired, therefore, that only such limitations shall be imposed u on my invention as' are indicated in the prlor art or set forth in the appended claims.

I claim as my invention:

1. A glow discharge transmitter case comprising a body of insulating material receSSed to provide chambers for the various .ments of a glow discharge transmitter, suit-- able clips for supporting said elements and,

having operative connection thereto,a metalic covering shield and sound-conveying and damping means cooperating therewith.

3. A glow discharge transmitter case for holding the parts of a glow discharge transmitter comprising a body of insulating material, sound conveying and damping means. and a covering shield of metallic material, said body holding the transmitter parts in. proper position for operative relation.

4. A housing for a telephone t*a-nsmitter of the glow discharge type comprising a block of insulating material having recesses therein and a metallic shield therearound clips secured to said body adjacent to each of said recesses, said body also having canals connecting said recesses and wires in said canals for connecting said clips.

5. In a telephone transmitter of the glow discharge type, asound responsive device, a housing enclosing electrical apparatus and said means, wires leading into said housing and connected tosaid apparatus, metallic,

sleeves covering each of said wires, av metallic casing enclosing said housing and insulated from the electrical a tlparatus therein, means connecting said casing to said sleeves and means for the ingress, control and damping of sound.

(3. In atelepehoue transmitter of the glow discharge type, a sound responsive device, a housing enclosing electrical apparatus, and said means, wires leading into said housing and connected to said apparatus, metallic sleeves covering each of said wires, a metallic casing enclosing said housing and insulated from the electrical apparatus therein, clips connecting said sleeves and holding said Wires in place, said clips being electrically connected to said casing and means for the ingress, control and damping of sound.

In testimony whereof, I have hereunto subscribed my name this 27th day of April 1923. I

LOUIS l. KINDE tMANN.