US1571020A

US1571020A - Crystal detector for wireless telephony and telegraphy

Info

Publication number: US1571020A
Application number: US588609A
Authority: US
Inventors: William D Mcgowan
Original assignee: Individual
Current assignee: Individual
Priority date: 1922-09-16
Filing date: 1922-09-16
Publication date: 1926-01-26
Anticipated expiration: 1943-01-26

Description

Jan. 26 1926.

' 1,571,020 W. D. MCGOWAN E CRYSTAL DETECTOR FOR WIRELESS TELEPHONY AND TELEGRAPHY Filed Sept. 16, 1922 2 Sheets-Sheet 1 INVENTOR.

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Jan. 26,1926. v 1,571,020

W O. M GOWAN CRYSTAL DETECTOR FOR WIRELESS TELEPHONY AND TELEGRAPH! Filed Sept. 16, 1922 2 Sheets-Sheet 2 INVENTOR. 7443. M Gawain A TTORNE Y.

Patented Jan. 26, 1926.

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days: Decreases son wrnnnnss tnnniirrioivr Asmsmeanaa Application filed September 16,1922. "serial as. 538,609.

T'o all whom 71$ may concern:

Be it known that I, WILLIAM D. Mo- GowAnj, a citizen ofth'e United States, and resident of Jersey City, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Crystal Detectors for Wireless Telephony and 'llelegraphy, of which the following is a specification.v

The present invention relates to crystal or mineral detectors for radio or wireless telephony and telegraphy.

Crystal or mineral detectors now in common use employ an adjustable contact point consisting of a single wire conductor and a fixed crystal or mineral element having but one of its sides positioned for contact with the wire. These devices require frequent and fine adjustment in order to make contact between the wire and the sensitive part of the mineral element, which contact is frequently accidentally broken, by jarring of the instrument, and continuity of the message is interrupted.

My invention has for its object the pro vision of novel means for overcoming these objectionable features; further objects being to provide a device of the character named which is simple in construction and susceptible of quick adjustment; which is adapted for utilizing all surface parts of a crystal or mineral element and which, when adjusted stays put and is capable of withstanding shocks; a still further object is to provide means for protecting the crystal or mineral element from dust and atmospheric influences.

In carrying out my invention I provide two slidably and rotatably adjustable conductor-members having respectively a multiplicity of yielding contact points, means for mounting said members, spring-means for holding said members in arbitrarily set relation, and means for enclosing a mineral or crystal element, all as hereinafter fully described and specifically set forth in the appended claims.

In the accompanying drawings forming part ,of this specification. Figure 1 is a plan view illustrating an embodiment of my improvement;

Fig. 2 is a side view;

Fig. 3 is an inverted plan view;

Fig. 4 is a longitudinal sectional View taken on the line er Fig. 1.

Fig. '5 is a cross sectional view thel'ine 55 of Fig. 1;

Fig. '6 isa'nend view'of oneof thec'o'ntact members; and I Fig. '7 is a side View thereof.

In the drawings, ;1 and 2 indicate cylindrical bearings which are composed fof'any suitable metal and are mounted on a block or base '3, of adaptable insulating material, by means of screws 4 and 5-, the screw 4 being in electrical connection with a binding post 6, by means of a metal plate 7 and screw '8, andthe screw 5 in electrical connection with 'abinding post 9, by means of a plate 10 and screw 11.

Connecting the inner ends of the

cylinders

1 and 2 is a transparent glass tube 12 of the same inner diameter or bore as said cylinders, whereby the contact members hereinafter described may have free sliding movement.

The contact members comprise, respectively, a resilient metal tube 13 havin fixed in its outer end a plug 14 in which is lmbedded the outer ends of the strands of a brush-like conductor 15 which is composed of a multiplicity of strands of fine wire of graduated lengths, whereby the projecting or contact end of the brush is of approximately truncated cone shape, as shown in Fig. 7 of the drawings, a knob 16 of insulating material being fixed around the outer end of the tube 13, whereby the contact member may be manually manipulated. The tube 13 is composed of a sheet of resilient metal havin overlapping edges which are fixed within the knob 16 and around the plug 14- adjacent its outer end part, a spring-yielding tongue 17 being provided for holding the contact members in arbitrarily set position within their respective

cylindrical bearings

1 and 2.

It is manifest that by employing a detector of the character described a fragment of crystal or mineral element, as a, may be readily manipulatedby means of the slidably and rotatably adjustable contact members until the sensitive parts of the mineral element are in electrical contact with the ends of the conductor brushes 15 which, owing to the yielding nature of their contact ends, maintain the contact and obviate taken on liability of having the same broken by jarring of the instrument.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a device of the character described, two spaced cylindrical electro-conductive bearings, a cylindrical insulating member connecting the bearings, an electro-conductive brush support slidable within each bearing and a plurality of resilient electro-conductive brush bristles carried by each brush support inwardly of the device abuttable upon a freely movable crystal detector.

2. In a device of the character described, a cylindrical holder comprising two spaced cylindrical electro-conductive members connected together by a non-conductive cylindrical member, a slidably movable conductive brush support within each spaced cylinder, a plurality of resilient electro-conductive bristles carried by each brush support within the device and a freely movable crystal detector within the device abuttable upon both sets of bristles.

3. In a device of the character described, a cylindrical holder comprising two spaced cylindrical electro-conductive members connected together by a non-conductive cylindrical member, a slidably movable conductive brush support within each spaced cylinder, a plurality of wire bristles carried by each brush support Within the device, a freely movable crystal detector Within the device abuttable upon both sets of bristles and means for maintaining the brush supports in any predetermined position Within the supports.

4:. In a device of the character described, a cylindrical holder comprising two spaced cylindrical electro-conductive members connected-together by a non-conductive cylindrical member, a slidably movable conductive brush support Within each spaced cylinder, a plurallty of Wire bristles carried by each brush support within the device, a freely movable crystal detector Within the device abuttable upon both sets of bristles and spring means for maintaining the brush supports in any predetermined position within the supports.

Signed at New York, in the county of New York and State of New York, this 1st day of August A. D. 1922.

WILLIAM D. MoGOWAN.