US1525159A - Crystal detector - Google Patents

Description

Feb. 3, 1925. 1,525,159

H M. WOHLTMAN ET AL CRYSTAL DETECTOR Filed April 24, 1922 W gwywz Patented Feb. 3, 1925.

PATENT OFFICE.

HENRY M. W'OI-ILTMAN AND MAX HIBSCHFELI), OF BROOKLYN, NEW YORK.

CRYSTAL DETECTOR.

Application filed April 24, 1922. Serial No. 556,214.

T 0 all whom it may concern:

Be it known that we, HENRY M. lVoHLT- MAN andl/Lix Hmsorrrnnn, citizens of the United States, residing at, respectively, Brooklyn, county of Kings, city of New York, and State of New York, and Broolc lyn, county of Kings, city of New York, and State of New York, have invented new and useful Improvements in Crystal Detectors, of which the following is a full, clear, and exact specification.

Our invention relates to wireless wave detecting devices and refers particularly to crystal detectors.

The object of our invention is a wireless wave detecting device employing a crystal, in which all parts are easily accessible and replaceable, in which the entire surface of the crystal may be utilized and which is capable of the most delicate adjustment.

Devices of this character are usually produced by setting, or fixing, the crystal within a cup, or container, whereby only a portion of thecrysta-l surface is exposed for purposes of wave detection. This particular form of construction very considerably reduces the efliciency and economy of these de tectors.

Another disadvantage of detectors of the above described construction is the difiiculty experienced in replacing old crystals by new ones.

The device of our invention overcomes all of these and other difficulties and presents a means whereby the greatest efficiency and ease of adaptability and replacement may be economically obtained.

In the accompanying drawings, illustrating one form of the device of our invention, similar parts are designated by similar numerals. I

Figure 1 is a top plan View of one form of a device or" our invention,

Figure 2 is a section through the line 2-2 of Figure 1. I

Figure 3 is a section through the line 33 of Figure 2, the spring and crystal being removed.

The particular form of the device of our invention, shown in the accompanying drawings, comprises an insulating base 10, to which are attached two oppositely opposed supporting members.

One supporting member comprises the angular plate 11 which is extended outward- 1y into the curved member 12 and the other supporting member comprises the angular plate 11 which is extended into the curved member 12.

Felt 13 separates the tube 14 from the plate 11 and felt 13 separates the tube 14 from the plate 11' and the two plates 11 and 11 are spaced from each other.

A glass tube 14 is connected to the plate 11 by the strap 15 and tothe plate 11 by the strap 15, the tube 14 having a large bore 16 connecting with a smaller bore 17 It has also a lug 4O placeable within a recess 41 of the plate 11 to prevent it from rotat- A threaded rod 18 meshes within the threaded opening 19 of the supporting member 12, the inward extension of the rod. 18 being smooth and reduced in diameter 20 and carrying a cup 21 at its inner extremity and a knob 22 at its outer extremity.

A. threaded rod 23 meshes within the threaded opening 24 of the supporting member 12 and is extended inwardly into a small diameter rod 25, to which is fixedly attached a thin flexible. wire 26. A knob 27 is carried by the rod 23.

Within the larger bore 16 of the tubes 14 is a spiral spring 28 abutable upon the cup 21 and the crystal 29.

Carried by the plates 11 and 11, respectively, are the binding posts 30 and 30 and the binding screws 31 and 31.

A screw 42 passes through the insulating material 10, a plate 11 or 11, the felt 13 or 13 into a threaded recess within a binding post 30 or 30, thus combining the various elements.

The operation of the device is as follows The rod 18 is removed, the crystal 29 is placed in the bore 16 of the glass tube 14, the spiral spring 28 inserted and the rod 18 screwed inwardly until the crystal 21 is firmly placed in the shoulder of the tube 14 caused by the reduction of the large bore 16. The wire 26, which is not absolutely straight is moved inwardly and outwardly, at the same time having a revolving movement by means of the rod 23 and thusmoved until the proper contact between the crystal 29 and the wire 26 is obtained.

If the crystal 29 does not present a sensitive point, or portion, the rod 18 is withdrawn slightly, thus removing the crystal 110 29 from fixed contact with the tube 14, and a slight movement given to the device will cause a change of position of the crystal which can thenebe set in fixed-position and the wire 26 be employed as before.

It is evident that by the above described means, all parts of the crystal 29 may be easily and readily exposed to the wire 26, thus increasing the usefulness of the crystal over those which are fixedly enclosed in a cup, whereby only a portion of the crystal is exposed.

It is further evident that a new crystal may be readily introduced by simply removing the rod 18, the spring 28 and the old crystal 29. 7

We do not limit ourselves to the particular size, shape, number, materials or arrangement of parts, as shown and described all of which are given simply as a means for clearly describing our invention.

lVhat we claim is:

1. In a wave detecting device, in combination, an insulating base, two spaced supports carried by the base, a glass tube having a large bore in one portion thereof and a smaller bore in the other portion thereof, a crystal within the larger bore, resilient means maintaining the crystal across the opening between the larger bore and the smaller bore, a crystal means whereby a Wire maybe brought into contact with different facial points of the crystal and binding posts and screws carried by each support.

2. In a wave detecting device, in combination, an insulating base, two spaced sup ports carried by the base, a glass tube having a large bore in one portion, thereof and a smaller bore in the other portion thereof, re silient means carried by one support whereby an uncovered crystal may be maintained within the large. bore, an uncovered crystal and means carried by the other support whereby a wire can be brought into contact with the crystal face, q 7

In a wave detecting device, in combination, an insulating base, two spaced supports carried by the base, a glass tube having a large bore in one portion thereof and a smaller bore in the other portion thereof, threaded means carried by the supportfmovable within the large bore, an. uncovered crystal within the large bore, a spiral spring between the threaded member and the crys tal, a wire and a threaded member carried by the other supportlwhereby the wire may be moved within .the with the crystal.

4. In a wave detecting device, in combi nation, an insulating base, two spaced sup ports carried by the base, a glass tube hav ing a large. bore in one portionthereofand a smaller bore in the other portion thereof, threaded means carried by one support movable within the, large bore, an uncovered crystal within the large bore, aspiral spring "etween the threaded memberandthecrystal, a bent w re, a threaded member carried by the other support wherebythebent wire may be moved transversely through' and revolubly within the small bore to contact with the crystal and a binding post and screw carried by each supportin Signed at New York city, in the county of New York and State of New York, this 15th day of April, 1922.

HENRY M. wonr'ri in. MAX nres cnrnnnu small bore to contact.

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