US2425481A

US2425481A - Quartz oscillator plateholder

Info

Publication number: US2425481A
Application number: US503246A
Authority: US
Inventors: Louis R Morse
Original assignee: REEVES HOFFMAN CORP
Current assignee: REEVES HOFFMAN Corp
Priority date: 1943-09-21
Filing date: 1943-09-21
Publication date: 1947-08-12
Anticipated expiration: 1964-08-12

Description

I R. MORSE QUARTZ OSCILLATOR PLATE HOLDER Aug. 12, 1947.

Filed Sept. 21, 1943 Z 62, in -26. f2

INVENTOR. Z 00/6 f8 4/0255 Patented Aug. 12, 1947 QUARTZ OSCILLATOR PLATEHOLDER Louis R. Morse, New York, N. Y., assignor, by

mesne assignments, to Reeves Hoffman Corporation, Carlisle, Pa., a corporation of Pennsylvania Application September 21, 1943, Serial No. 503,246

14 Claims. 1

This invention relates to quartz oscillator plate holders and has for its object certain improvements in their construction.

Holders of various designs have been proposed for quartz oscillator plates. For the most part they are not readily assemblable or tend to fail in service. These holders are widely used in radio circuits, for example, transmitters and receivers in planes, tanks, field signal devices, etc., and are, therefore, subjected to considerable rough treatment. They must not only be weather-proof but must be able to withstand a great deal of rough treatment without impairing the frequency rating of the oscillator plate mounted therein.

I have discovered a holder which, for the most part, overcomes the disadvantages of the holders heretofore proposed. Its parts may be readily assembled to complete the holder and once put together the holder is sufiiciently durable to Withstand considerable rough usage without impairing the frequency value of its oscillator plate.

The quartz oscillator plate holder of the invention comprises a casing; a pair of external socket prongs secured to the casing; a pair of spaced sliding contacts in the casing, each sliding contact connecting with the base of a socket prong; a removable chase in the casing between the sliding contacts, the walls of the chase being provided with a plurality of projecting stops and the projecting stops being spaced in relationship to one another to accommodate a pair of electrodes, a. quartz crystal oscillator plate and a spring conductor and to provide a free space between the walls of the case and the edges of the electrodes and oscillator plate, so that contact of the oscillator plate with the chase is limited to the projecting stops.

The invention will be better understood by referring to the accompanying drawing, taken in conjunction with the following description, in which:

Fig. 1 is a side view in cross-section of a holder illustrative of the invention;

Fig. 2 is a cross-sectional view on the line 2-2 of Fig. 1;

Fi 3 is a cross-sectional view on the line 33 of Fig. 1;

Fig. 4 is a top plan view, with the top removed showing the casing of the holder and its interior before the chase assembly is inserted;

Fig. 5 is a cross-sectional view of the chase assembly before it is inserted in the casing;

Figs. 6 and 7 are side and end views, respectively, of the chase itself; and

Figs. 8 and 9 are side and end views, respectively, of one of a pair of electrodes going into the chase assembly.

The holder shown comprises a, casing Ill, a pair of external socket prongs H and I2 secured to the bottom of the casing, a pair of spaced sliding contacts l3 and Id in the casing, aremovable chase l5 in the casing between the contacts, a pair of electrodes l6 and ll, a quartz oscillator plate l8 and a spring conductor IS The casing is made of suitable insulating and weather-proof material. It is provided at its bottom with a pair of holes 20 and 2| to receive the socket prongs, the lower ends of holes terminating in enlarged

recesses

22 and 23 and the upper ends of the holes in enlarged

recesses

24 and 25 to provide an intermediate raised abutment 2%. The casing walls provide a hollow interior 2? to receive the sliding contacts and the chase assembly. The

end walls

28 and 29 of the casing are provided at their top with a pair of holes 3% and Si, respectively, each of which is snugly fitted with a threaded sleeve 32. The tops of the casing walls have an inner raised central portion 35 adapted to fit into a complementary recessed portion 36 in a removable cover 31. A flexible washer or gasket 38 fits between the cover and the top walls of the casing. The cover is provided with a pair of holes 40 and 4| with enlarged recesses adapted to receive the heads of screws 42 and 43 fitting in sleeves 32.

Socket prongs H and i2 are provided with sprung retainer washers t5 and 46 adapted to fit in

recesses

22 and 23. The prongs extend into the bottom of the casing, their upper ends being threaded to engage

nuts

41 and 48.

Sliding contacts [3 and [4 are zig-zag in shape as shown, so that their lower ends fit over the prongs. Nuts ll and 48 are tightly screwed on the prongs so that the sliding contacts and prongs are in electrical contact. The upper ends of the sliding contacts extend along the sides and midway of the walls of the casing, terminating just short'of the tops thereof.

Chase I5 is shown in various views in Figs, 1-3 and 5-7. It consists generally of a rectangular frame with rounded outer corners. The chase is constructed of suitable insulating material, preferably with a high dielectric constant. Its walls have a very special configuration to adapt it to the presently preferred practice of the invention. Side walls 59 and El are substantially parallel and of the same height. The lower wall 52 is provided with a protruding shoulder 53, which is adapted to engage intermediate raised abutment 3 26 at the bottom of the casing, between nuts 4'! and 4B, and thus provide

clearance spaces

54 and 55 between the lower corners or the chase and the nuts and prongs. The lower wall is spaced between the side walls to provide clearance spaces 56 on the sides thereof to accommodate the slid ing contacts. The upper wall 60 is provided with an intermediate portion 6|, having a height less than that of the adjoining wall portion, to pro

vide clearance spaces

62 and 63 on the sides of the intermediate portion, likewise to accommodate the sliding contacts. Each of the inner corners of the chase has a small angular projecting stop 64 extending into the interior, thus providing a clearance space 65 along the major portion of the inside of each wall. These projecting stops function as guides and stops for the electrodes and oscillator plate.

Electrodes l6 and I1 may be of conventional metal construction, as shown. Each electrode is rectangular in shape and each corner of at least one side or face has a raised portion which together provide a recessed portion N that extends across most of the side or face of the electrode to the edges thereof. When the oscillating plate is sandwiched between a pair of the electrodes with the recessed portions facing the oscillating plate, they provide air gaps l2 and 13, as shown more particularly in Figs. 2, 3, and 5, because the raised corner portions ll] of the electrodes bear against the oscillating plate at its corners.

Quartz crystal oscillator plate 18 is any conventional type or cut. The one shown is rectangular in shape, substantially of the size of the electrodes. As in standard holders, it is sandwiched between the electrodes.

Spring conductor l9 may also be of the conventional type. The one illustrated is generally rectangular in outline but somewhat smaller than the electrodes, with its center portion curved and bent upwardly as shown. The bent portion is sufiiciently high to give it the required spring action to maintain electrical contact between it, its adjacent sliding contact and adjacent electrode, as well as to force and maintain the other electrode in electrical contact with the other sliding contact.

In assembling the holder, the following procedure may be employed:

Socket prongs H and 12, with

washers

45 and 46 mounted thereon, are inserted in holes 29 and 2| in the bottom of the casing i0. Sliding contacts I3 and M are then passed into the casing so that their lower bent-over ends fit over the threaded ends of the socket prongs. Nuts 4'! and 48 are screwed onto the ends of the prongs to make a tight electrical contact between the prongs and the contacts. Quartz oscillato plate I8 is sandwiched between electrodes l6 and IT, the electrodes being arranged so that their raised corner portions 10 bear against the oscillating plate at its corners. The electrodes and plate are placed in the interior of the chase IS with spring conductor l9 resting on one or the other electrode. The resulting chase assembly is then inserted into the casing with protruding shoulder 53 of the chase pointed toward intermediate raised abutment 26 in the bottom of the interior of the casing. As the chase assembly is pushed into the casing, the spring conductor is in sliding engagement with one of the electrodes while the other electrode is in sliding engagement with the other sliding contact. When the chase assembly has been completely inserted, flexible washer or gasket 38 is placed in position, removable cover 3'! is placed over the top of the casing and screws 42 and 43 are tightly screwed in sleeves 32.

Recesses

22 and 23 in the bottom of the casing are preferably filled with a moisture proof sealing compound.

It will be clear to those skilled in this art that the holder of the invention may be readily and accurately assembled and that the oscillator plate may be mounted in such a manner as to assure its operative position under all conditions of actual use. The plate cannot slide away from its installed position. Gaps of predetermined size are always maintained about the plate, its edges as well as its faces. This novel construction assures a holder the oscillator plate of which effectively retains its frequency rating.

I claim:

1. In a quartz oscillator plate holder, the improvement comprising a casing, a pair of external socket prongs secured to the casing, a pair of spaced sliding contacts in the casing, each sliding contact connecting with the base of a socket prong, a removable chase in the casing between the sliding contacts, the walls of the chase being provided with a plurality of projecting stops and the projecting stops being spaced in relationship to one another to accommodate a pair of electrodes, a quartz crystal oscillator plate, and a spring conductor and to provide a free space between the walls of the chase and the edges of the electrodes and oscillator plate, whereby contact of the oscillator plate with the chase is limited to the projecting stops.

2. A quartz oscillator plate holder according to claim 1, in which each inside corner of the chase is provided with one of said projecting stops.

3. A quartz oscillator plate holder according to claim 1, in which opposite walls of the chase are indented to accommodate the sliding contacts.

l. In a quartz oscillator plate holder, the improvement comprising a casing, a pair of external socket prongs secured to the casing, a pair of spaced sliding contacts in the casing, each sliding contact connecting with the base of a socket prong, a removable chase in the casing between the sliding contacts, the walls of the chase being provided with a projecting stop at each inside corner, a pair of electrodes, a quartz oscillator plate disposed between the electrodes, said electrodes and oscillator plate being mounted in said chase, and a spring conductor disposed between and in engagement with one of the electrodes and its sliding contact to keep the other electrode in engagement with its sliding contact, said projecting stops in the corners of the chase being spaced in relationship to one another to accommodate the electrodes and oscillator plate and to provide a free space between the wall of the chase and the edges of the electrodes and oscillator plate, whereby contact of the oscillator plate with the chase is limited to the projecting stops, the lower wall of the chase being provided with a projecting central portion resting against a complementary projecting central portion at the bottom of the casing. J

5. In a quartz oscillator plate holder of the type described, the improvement comprising a removable chase adapted to fit in the casing of the holder, the walls of the chase being provided with a plurality of projecting stops and the projecting stops being spaced in relationship to one another to accommodate a pair of electrodes, a quartz crystal oscillator plate and a spring conductor and to provide a free space between the walls of the chase and the edges of the electrodes and oscillator plate, whereby contact of the oscillator plate with the chase is limited to the projecting stops.

6. In a quartz oscillator plate holder of the type described, the improvement comprising a removable chase adapted to fit in the casing of the holder, the walls of the chase being provided with a projecting stop at each inside corner and the projecting stops being spaced in relationship to one another to accommodate a pair of electrodes, a quartz crystal oscillator plate and a spring conductor and to provide a free space between the Walls of the chase and the edges of the electrodes and oscillator plate, whereby contact of the oscillator plate with the chase is limited to the proj ecting stops.

7. In a quartz oscillator plate holder of the type described, the improvement comprising a removable chase adapted to fit in the casing of the holder, the walls of the chase being provided with a plurality of projecting stops and the projecting stops being spaced in relationship to one another to accommodate a pair of electrodes, a quartz crystal oscillator plate and a spring conductor and to provide a free space between the walls of the chase and the edges of the electrodes and oscillator plate, whereby contact of the oscillator plate With the chase is limited to the projecting stops, opposite walls of the chase being indented to accommodate the sliding contacts.

8. In a quartz oscillator plate holder of the type described, the improvement comprising a removable chase adapted to fit in the casing of the holder, the walls of the chase being provided with a projecting stop at each inside corner and the projecting stops being spaced in relationship to one another to accommodate a pair of electrodes, a quartz crystal oscillator plate and a spring conductor and to provide a free space between the walls of the chase and the edges of the electrodes and oscillator plate, whereby contact of the oscillator plate with the chase is limited to the projecting stops, opposite walls of the chase being indented to accommodate the sliding contacts.

9. In a quartz oscillator plate holder of the type described, the improvement comprising a removable chase adapted to fit in the casing of the holder, the lower wall of the chase being provided with a projecting central portion adapted to rest against a complementary projecting central portion at the bottom of the casing, so that free spaces are provided on both sides of said projecting central portions.

10. In a quartz oscillator plate holder of the type described, the improvement comprising a removable chase adapted to fit in the casing of the holder, the lower wall of the chase being provided with a projecting central portion adapted to rest against a complementary projecting central portion at the bottom of the casing, so that free spaces are provided on both sides of said projecting central portions, the walls of the chase being provided with a plurality of projecting stops and the projecting stops being spaced in relationship to one another to accommodate a pair of electrodes, a quartz crystal oscillator plate and a spring conductor and to provide a free space between the walls of the chase and the edges of the electrodes and oscillator plate,

whereby contact of the oscillator plate with the chase is limited to the projecting stops.

11. In a quartz oscillator plate holder of the type described, the improvement comprising a removable chase adapted to fit in the casing of the holder, the lower wall of the chase being provided with a projecting central portion adapted to rest against a complementary projecting central portion at the bottom of the casing, so that free spaces are provided on both sides of said projecting central portions, the walls of the chase being provided with a projecting stop at each inside corner and the projecting stops being spaced in relationship to one another to accommodate a pair of electrodes, a quartz crystal oscillator plate and a spring conductor and to provide a free space between the walls of the chase and the edges of the electrodes and oscillator plate, whereby contact of the oscillator plate with the chase is limited to the projecting stops.

12. A container for radio crystals comprising a casing body having a cavity that is open at one end of the casing body, stationary contacts exposed at opposite sides of the casing cavity and having terminals that project through the casing body, a drawer-like receptacle adapted to slide into and out of the casing cavity and having an opening through its central portion to which the opposite stationary contacts are exposed when the drawer is in operative position, a crystal, a pair of contact elements between which the crystal is disposed, one of said contact elements being laterally resilient, said crystal and opposite contact elements being disposed within the open central portion of the drawerlike receptacle for unitary movements therewith into and out of the casing cavity and being laterally removable from said drawer-like receptacle when the receptacle is removed from the cavity, said contact elements engaging opposite fixed contacts of the casing when in operative position and said laterally resilient contact element maintaining a yielding pressure on the parts interposed between the opposite casing contacts, and a cover for said casing cavity.

13. The structure defined in claim 12 in which the said stationary casing contacts ar in the nature of flat strips lying along opposite sides of the casing cavity and in which the terminals thereof are in the nature of contact prongs that extend through the casing body at its end opposite the opening thereof, said contact strips being electrically connected to opposite of said prongs and extending therefrom toward the open end of the casing cavity.

14. The structure defined in claim 12 in which the drawer-like receptacle snugly fits in the casing cavity and closely embraces the edges of the crystal and opposite contact elements contained therein.

LOUIS R. MORSE.

REFERENCES CITED UNITED STATES PATENTS Name Date Diehl Oct. 31, 1939 Number