US2384756A

US2384756A - Crystal

Info

Publication number: US2384756A
Application number: US552487A
Authority: US
Inventors: Walter E Kuenstler
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-09-02
Filing date: 1944-09-02
Publication date: 1945-09-11
Anticipated expiration: 1962-09-11

Description

Sept. 11, 1945.

w. E. KUENSTLE-R CRYSTAL Filed Sept 2. 1944 IN V EN TOR.

'f diiorw.

" position of the same.

Patented Sept. ll, 1945 UNITED STATES PATENT OFFICE 23 Walter E. Kama; :llflslfle Park, N. J.

Application September No. 552,481

Claims.

This invention relates to crystals of the character employed in radio work, such as c ystals of quartz, tourmaline, or other piezo-electric material, and-one of the objects of the inventicnis to provide an improved mounting and housing means of superior construction for crystals of this character.

' In my co-pending applications for patent, Serial Nos. 529,610, filed April 5th, 1944, and 547,692, filed August 2nd, 1944, I disclose housings or casings for crystals, the housings or casings therein shown being composed of plastic materials, such as glass, or any of the numerous plastics having insulating characteristics as well as resistance to moisture and climatic conditions. The present invention contemplates the use of a casing or housing of this character, and contemplates also the provision of means by which a greatly improved method of assembly for the various parts of the structure may be had, thereby materially speeding up the production of the crystals and at the same time insuring precision and accuracy of assembly.

For example, in the conventional method of assembling a crystal of this character, it is necessary to provide lead wires extending from the contact pins to the electrodes between which the crystal is sandwiched, such lead wires being usually soldered or otherwise fused to the pins and to the electrodes. In the present improved structure, such fusingtogether of the parts is dispensed with, yet perfect electrical contact between the parts is assured by the particular dis- In the accompanying drawing, wherein several embodiments of the invention are shown, Fig. 1 is a sectional view through a crystal assembly, constructed in accordance with the invention;

4 and 5, and a pair of

spring plates

6 and 1 between which the crystal and electrodes are sandwiched and which hold the crystal and electrodes in place and apply pressure upon them.

At the bottom of the recess is provided a raised central portion 8, moulded as a part of the housing, and provided with a pair of transverse ribs 9 on which the crystal and electrodes rest, as clearly Seen in Fig. 1. At HI and H are shown the contact pins, which have their respective end portions l2 and I3 embedded in the body portion I of the housing, each of these end portions having a rounded terminal or tip I l projecting into the recess or chamber 2 so that it is accessible to a doubled-over spring tongue formed lower end of the plate 8 rests against and estab- Fig. 2 is a vertical sectional view, taken at right I ing material, such as glass or of any one of the other. suitable plastic materials satisfactory for the purpose. The body portion l is provided with an interior chamber or recess 1, so shaped as to snugly accommodate the crystal 3, the'electrodes lishes electrical contact with the terminal l4 of the contact pin II.

The recess or chamber 2 is open at one end, herein referred to as the"top," and in the assembly of the device, the parts contained within the housing are inserted through this top opening. after which a. closure member or cover, indicated at I1, is placed in position to close the opening, and then the body portion l and the closure member are secured together, such as by being fused or flame-sealed if the housing parts I and H are composed of glass or similar fusible in position to close the housing, its inner end II will come into contact with the upper ends of the spring plates 6 and I and flex or bow the same outwardly to a considerable extent, or as shown in Fig. 2. The result of this flexure of the plates 8 and l is to cause parts of the plates such as shown at If and 22, to be urged inwardly, or toward the crystal and electrodes, with some pressure so that the two

plates

6 and 1 thus tend to clamp or compress the crystal 3 and

electrodes

4 and 5 between them. The result is that the plates 0 and I, being under end-wise compression, are flexed to cause them to not only hold the crystal and electrodes from shifting, but also apply the required pressure on these elements to maintain the required frequency.

The imposition of end-wise pressure on the bowed spring plates 6 and i by the closure member I! also tends to force these plates in a direction toward the terminal ends [4 of the contact pins l and ii so that as a result, the doubleover spring tongues i and i6 are held resiliently but firmly in contact with these ends l4. Ac-

cordingly, the spring plate 6 being in contact with the electrode 4, and having its spring tongue in contact with the terminal end of the contact pin ii establishes electrical connection between the electrode 4 and the contact pin i I. Similarly, the spring plate 1, being in contact with the electrode 5 and having its spring tongue I! in contact with the contact pin in, establishes electrical connection between the electrode 5 and the pin iii.

In the manufacture of the assembly described, the housing body i is moulded around the pinends i2 and I3, and the terminals H of these pins are exposed in the chamber or recess 2. The crystal and electrodes are sandwiched between the spring plates 6 and 'l and these parts are then inserted in the housing body i through the then open top of the same. The closure member is then placed in position and this causes the plates 6 and i to be flexed as hereto- -fore described to cause them to compress the crystal and electrodes between them, and to be also urged toward the terminal ends I4 so that the spring tongues l5 and I6 will be urged into firm contact against these pin-ends. The closure member is then fused to the body i by being flame-sealed thereto, and the assembly of the device is then completed.

It is to be noted that the establishment of the required electrical connections between the several parts of the device is secured automatically by merely placing the parts together in their required positions, such placement of the parts not only placing the crystal and electrodes under desired compression, but also compressing the spring tongues against the ends of the contact pins and thereby establishing positive electrical contact therewith. Thus the possibility of corroded fused joints between the parts is completely obviated.

In the structure shown in Figs. 4 and 5, the crystal 3 is provided with

electrodes

24 and 25 in the form of layers or coatings intimately attached or applied to the opposite faces of the crystal. With this arrangement it may be found desirable to establish a very positive contact with these coatings and the

spring plates

6 and 1, and accordingly the spring plates may be provided with pointed or conical projections 26 which are firmly forced against the electrodes by the fiexure of the

spring plates

6 and 7 in the manner described in respect to the structype shown at I and 5, or the surfaces of the

plates

6 and 1 may be roughened .is in fact invisible) a watertight sealed closure results, maintaining the contents safely under all conditions of use.

What I claim is:

1. In a crystal assembly, a housing having a recess, a crystal and electrodes located in said recess, a contact pin having a part projecting into the recess, a resilient plate member imposing pressure against the crystal and electrodes, said plate. having a part urged resiliently against the portion oi the contact pin located in the recess, a part of the housing being operative against the plate member to cause the same to exert pressure against the crystal and electrodes and to cause the pin-contacting part to be urged toward the pin.

2. In a crystal assembly, a housing provided with a recess containing a crystal sandwiched between electrodes, a pair of spring plates between which the crystal and electrodes are held, a spring extension on each plate, contact pins each having an end disposed in the recess, one or the spring extensions being held in resilient contact with ach pin-end, and a closure member on the housing operative against the spring plates to cause them to compress the crystal and electrodes between them.

' 3. In a crystal assembly, a housing provided with a recess containing a crystal sandwiched between electrodes, a pair of spring plates between which the crystal and electrodes are held, a spring extension on each plate, contact pins each having an end disposed in the recess, one of the spring extensions being held in resilient contact with each pin-end, and a closure member on the housing operative against the spring plates to cause them to compress the crystal and electrodes between them, said closure member being also operative to urge said plate toward the contact pins to hold the resilient spring extensions in firm contact with the ends of said pins.

4. In a crystal assembly, a housing of glass or similar plastic material, said housing being provided with a recess, a pair of contact pins having parts embedded in the body of the housing and ends exposed within the recess, a pair of electrodes and a crystal between the same located within the recess, a pair of spring plates between which the crystal and electrodes are sandwiched, each of said spring plates being provided with a doubled-over tongue portion at one end held in contact with the end of one of the pins, and a part of th housing exerting endwise pressure on the spring plates for flexing parts of the plates toward the electrodes and for urging the spring tongues on the plates toward the pins.

5. In a crystal assembly, a housing 01' insulating material having a' recess, a crystal and electrodes carried in said recess, at least one spring plate overlying one of the electrodes and in resilient contact therewith, means for urging said spring plate toward the electrodes with which it contacts, and a bent spring tongue on the plate. a contact pin having a part entering the recess and located in contact with the bent spring tongue.

6; In a crystal assembly, a housing having a recess, a crystal and electrodes carried therein,

a spring plate overlying one of the electrodes and in contact therewith, means for urging said spring plate toward the electrode with which it contacts, a bent spring tongue on the plate, a contact pin having a part entering the recess and located in contact with the bent spring tongue, the means for urging the spring plate toward the electrode also urgingthe bent spring tongue toward and into contact with the end of the pin.

'7. In a crystal assembly, a housing including a block of insulating material having a recess provided with a bottom formed with a raised central part, a crystal and lectrodes located in the recess and resting upon the raised central part thereof, contact pins embedded in the block and having inner ends exposed within the recess on opposite sides of the raised central part, a pair of plates between which the crystal and electrodes are located, each plate having an extended doubledover spring tongue held against a pin end, the housing having a part operative to urge the spring tongues toward the pin ends and also to flex the plates and cause them to exert pressure on the crystal and electrodes held between them.

8. In a crystal assembly, a housing. a crystal and electrodes located therein, spring plates between which the crystal and electrodes are held, and a part of the housing operative against one edge of each of the plates to flex the plates and cause parts of the same to compress the crystal and electrodes between them.

9. In a crystal assembly, a housing. a crystal and electrodes therein, spring plates between which the crystal and electrodes are held, and a part of the housing operative against one end of the plates to bow the plates and cause them to compress the crystal and electrodes between them, contact pins in the housing and parts of the plates held into resilient contact with said pins by the housing means operative against the plates.

10. In a crystal assembly, a housing, a crystal and electrodes therein, contact pins in the housing and having parts projecting therefrom, spring plates in the housingv held in contact with the electrodes, and spring tongues formed on and extending from the plates and held resillentLv against parts of the pins within the housing.

11. In a crystal assembly, a housing, a crystal and electrodes therein, contact pins in the housing and having parts projecting therefrom, a pair of spring plates in the housing between which the crystal and electrodes are sandwiched, spring tongues integrally formed on and extending from the plates, said tongues being doubled upon themselves and held in contact with parts of the .pins on the inside of the housing.

12. In a crystal assembly, a housing, a crystal and electrodes therein, contact pins in the housing and having parts projecting therefrom, a pair of spring tongues resiliently urged against the ends of the contact pins, and plates extended from said tongues and resiliently held in contact with the electrodes.

13. In a crystal assembly, a housing formed of glass or similar material, said housing having an interior recess, a crystal and electrodes fitted within said recess, a pair of spring plates between which the crystal and electrodes are sandwiched, contact pins having terminals projecting into the recess, the spring plates having integral tongues held in contact with the terminals of .the pins, and a closure member closing the recess and fusibly attached to the housing, said closure member being operative against portions of the spring plates to cause said plates to grip the electrodes and crystal between them and to hold the tongues into contact with the pin terminals.

14. In a crystal assembLv, a crystal having its opposite faces metallic-coated, a pair of spring plates between which the crystal is sandwiched, the faces of said plates having projections resting against the coated faces of the crystal, a pair of contact pins, the spring plates each having a resilient tongue held against one of the contact pins, and means for placing the spring plates under pressure, said means constituting part of a housing in which the crystal, the plates and the contact pins are contained.

15. In a crystal assembly, a housing, a metallic-faced crystal therein, contact pins in the housing and having parts projecting therefrom, a pair of spring tongues resiliently urged against the ends of the contact pins, and plates extended from said tongues and resiliently held in contact with the metallic-faced crystal.

WALTER, E. KUENB'I'IER.