USRE22371E - R dally - Google Patents

Description

Sept. 7, 1943. v R.l DALliY Re. 22,371

CRYSTAL PICKUP. UNIT original Filed June '3, i940 l2 sheets-sheet 1 5f liv n INVENT OR.

l ATTORNEYS.

Sept. 7, 1943. R. DALLY.

CRYSTAL PcKUP UNIT original Filed June 3, 1940 2 sheets-Sheet 2 INVENTOR.

ATTORNEYS.

` Reuued Sept. 7,194.3

Nr oFFlcE CRYSTAL PICKUP UNIT Roy pany, Racine. wis., assignor to Webster Electric Company, Racine, Wis., a corporation of Delaware Original No. 2,261,616', dated November 4,1941, t Serial No. 338,519, June 3, 1940. Application for reissue October 16, 1942, Serial No. 462,288

23 Claims The present invention relates to pick-up units for tone arms and the like and is particularly concerned with improved pick-ups of the crystal type.

In the pick-up units of the prior art a pressure or a sharp blow against the needle `screw would .shift the needle chuck assembly in its rubber bearings and result in a permanent displacement of the assembly which might change the characteristics of the pick-up unit. In extreme cases, such a blow might cause breakage of the crystal element which is clamped to the needle chuck assembly in the devices to which I refer.

One of the obiectsiof the present invention is the provision of `an improved crystal pick-up unit which is so constructed that it is impossible to displace the chuck longitudinally beyond predetermined limits.

Another object of the invention is the provision of an improved crystal pick-up unit which is provided with thrust bearing means for its chuck by means of which the displacement of the chuck longitudinally of the bearings is positively prevented.

Another object of the invention is the provision of an improved crystal pick-up unit withA means for assuring the accurate location of stops on each side of the chuck in order to prevent excessive displacement of the chuck which might cause breakage of the crystal element.

Another object of the' invention is the provl. sion of such adjustable accurate stops for the chuck to prevent breakage of the crystal element, which stops are adapted to be adjusted after the entire crystal unit has been assembled, and the chuck assembly has taken its natural position with respect to the strain which is set up inside by the assembly and/the various rubber components of the assembly.

Another object of theinvention is an improved 'Y adjustable stopfor the chuck for a crystal pickup unit which is adaptedto permit the adjustment of the chuck stops to compensate for diameter tolerances which are necessary in the die.- cast chuck. Y

Another object of the invention is the provision of an improved crystal pick-up unit which is 'adapted to reproduce with high'. fidelity and adapted to be used for a^long period of time with-` out necessity for-repair or readjustment.

Another object ofthe invention is the provision 'Y .of an improved crystal pick-'up unit which may be manufactured very economically and which may thus be placed within the means of a larger number of purchasers. v

Other objects and advantages of the invention will be apparent from the followingl description and the accompanying-drawings, in which similar characters of reference indicate similar parts throughout the'several views.

Referring to the single sheet of drawings accompanying this specication:

Figure 1 is a fragmentary top planview of aY phonograph equipped with a pick-up constructed according to the invention,` table and tone arm;

Figure 2 is an enlarged horizontal sectional view of a pick-up embodying the invention taken on the plane of the line 2-2 of Figure 5, looking in the direction of the arrows;

Figure 3 is an enlarged vertical sectionalview taken onvthe planeof the line 3--3 of Figure 2 looking in the direction of the arrows;

Figure 4 is an enlarged fragmentary bottom plan View showing the chuck stops;

Figure 5 is an enlarged vertical sectional view `showing the turntaken on the plane of the line 5-5 of Figure 3 looking in the direction of the arrows;

Figure 6 isa rear elevational view of the pickup unit;

Figure 7 is a front end view of the pick-up unit;

Figure 8 is a sectional view taken on thev plane. of the line 8-8 of Figure 2; and

Figure 9 is a top plan view of theV unit.

Referring to Figure 1, I0 indicates asupport such as the top table of a phonograph housing which may be provided with a rotatable turn-A vtable II carrying a record. l2. The support Il carries a standard I3 which supports a tone arm .I4 for substantially universal movement so that midway between the innermost and outermosty grooves -of therecord.

'I'he pick-up unit I5 may be supported to an I4 by suitablesupporting angles which are secured to a supporting flange It that is -provided with apertures I1 for screw bolts-or other securing devices. Y

' The pick-up unit yI5 is preferably housed in a stamped 'sheet metal housing indicated in its entirety by the numeral IB. Thishousing may consist 0f a lower housing member I9 and an upper housing member 28, either one of which may carry the supporting iiange I6.

The two housing members I9 and 2.0 may be identical in shape and structure except for the fact that one oi these housing members carries the laterally projecting supporting flange |6 and` the lowermost. of these housing members is provided with an aperturell (Fig. 3) for the needle chuck. v

In some embodiments of the invention, both` the upper and lower housing members may be of similar shape and the supporting Viange 'I6 may be eliminated. Each of these housing members is Apreferably formed at itsy ends with the relatively ilat attaching flange portions 22, 23,

At the outer` edge of each housing member ad'- jacent the open side, the housing is provided with an outwardly extending lip 35, the outer'- most surface 36 of which is located in the same planeas the attaching flanges 22, 23, 24. This lip is of course not necessary where the supporting iiange i6 is located,- as y,that ange serves the same purpose. x

For the purpose of permitting a wider angular adjustment of the cartridge I5 inside a tone arm I4, one end of the otherwise substantially rectangular supporting ilange I6 is beveled ofi at 31, Fig. 1. When the two housing members are at the left end in Figure 2, and 24 vat the rightl l The attaching ange portion 24 is located between a pair of longitudinally extending grooves 25, 26 pressed in the housing member and extending from the outside to the inside. These grooves are for the reception oi the insulated conductors 21, 28 which lead to the conductors ony the opposite sides of crystals inside the cartridge. The conductors are for the purpose of impressing the electromotive forces generated by the crystal upon an amplifying system.

The conductors 21, 28 are preferably rubber covered conductors having a live resilient rubber covering of circular cross-section which is slightly larger than the aperture made by the two opposed grooves 25, 26. Thus the rubber covered conductors may be clamped in the grooves by the two half-portions of the housing when the housing is assembled and this end of the housing is sealed against moisture.

'For the purpose of assuring the securement of the conductors `21, 28 in the grooves 25, 28, one of each of the grooved housing members may be provided with a transverse ridge or deformation which makes a slight ridge 9| on the inside oi' each of these two grooves. This ridge 9| further clamps the rubber covered conductors and serves as an anchor.

The ends oi the conductors may be directly connected to the foil on the crystals, thus eliminating any necessity for any connectors on the crystal unit. Each unit may be provided .with conductors oi suillcient length for1 connection to other apparatus.

The attaching flange -portions 22 and 23 are in the same plane as the part 24 and comprise substantially iiat portions oi the housing member which are located on the` opposite sides oi pressed, partially cylindrical groove' 29|iormed `in` this end of each'housing and extending from the oui-.side t the interior of the housing.

The groove 29 is for the purpose of receiving a rubber bearing 301er a chuck trunnion 3l, the

rubber bearing 30 being in the form of a tubular resilient rubber` member tting in the groove after it has been applied tothe cylindrical chuck i trunnion 3|. lThe trunnion and bearing assemsecured together, as shown in Fig. 5, the lips on one side, andthe lip 35 and flange I6 on the other side engage each other and the attaching ilange portions 23, 24 engage the same flange portions on the other housing member in such manner that'the housing is completely closed except for the conductor grooves 25, 26and the bearing groove 2,9. by the ,rubber insulatedk 'conductors placed-in them and by the rubber covered trunnion 3|.

The two housing members are also formed with the diagonally inwardly extending ilanges 3,8, 39 which are joined` along a ridge 4|| except at a point midway between the sides of the cartridge where this ridge 40 and the flanges 38, 39 are varied in shape to form a partially cylindrical groove 4| extending axially of the cartridge. The partially cylindrical grooves 4| inthe two housing members form a substantially cylindrical aperture between the chambers 32 and 33 except for the fact that the two ridges 40 do not contact each other internally and the cylindrical opening is not completely deiined. s,

The ypartially cylindrical surface 4|, however, in each cartridge forms suillcient of a cylindrical bearing to receive a cylindrical bearing portion 42 on the needle chuck 43 when this bearing is covered with a tubular rubber member 44.

The housing members are also provided with inwardly extending ilange portions 45, 46 and the ilat portion 41 which is spaced inwardly of the upper and 'lower walls 48, 49 in/ such manner that flat clamping surface 50 is provided on each housing member.v

These flat clamping surfaces 50 are parallel to each other and parallel to the crystals 5|, 52

and the crystals 5I, 52 are clamped by these surfaces through the agency of the flat resilient deformable clamping blocks 53, 54.

These blocks may be made of rubber orn other suitable live resilient material such as printer's roll composition, and the blocks' are securedto the clampingsurfaces 5l|` by suitable rubber cement, k

The chamber 34 serves as a connection chamber for connecting the conductors 21, 28 to the conducting layers 55, 56, 51 which are outside of and interposed between vthe crystals 5|, 52. Referring to Fig. 3, the end of the cartridge is closed by means oi the substantially flat end wall portions 58 at the right and by the curved 4,encl wall portions 59jat the left in Fig. 4.

As the crystal members in the present pick-,up unit are disposed in a plane parallel to the plane of the record, they will of course be out appropriately with respect to the axes ofthe crystal from which they aremade, vsothat ther twisting action ofthe chuck under the iniluencc ofthe yneedle will generate electromotive forces` that are collected bymeans of the conductors 55, 58,- 51, and transmitted through conductors 21, 28. The conductorsv 55, 56,51, may be connected .in

These are of course closed various ways, such as series or parallel, as disclosed in my prior Patent No. 2,145,389 of Janvuary 31, 1939, accordingto the characteristics desired.

The crystal member assembly I, 52, 55-51, is clamped at its right end between the resilient blocks 53, 54 which are compressed against the crystal assemblyby the clamping surfaces 50 of:

printers roll composition of suiilcient width toI extend beyond the borders `oi the clamping jaws 6|, 62 of thechuck iuiit and oi suilicient length so that it may be folded to substantially U-shape aboutthe end of the crystal assembly and interposed between the jaws 60, 62, and the crystal assembly.

This resilient cushion El) between the chuck and the crystal assembly is adapted to give predetermined cushioning connection between theY crystal assembly and the chuck. The rubber strip 60 is compressed and clamped between the opposed jaws 6|, 62. The pressure placed upon the crystal assembly and rubber strip Gil can be varied or adjusted by the application of pressure to the jaws 5|, `62 to bend them into closer engagement with the rubber strip 60 and crystal assembly.

The chuck unit 43 preferablycomprises a die-` cast metal member which is provided with a substantiallycylindrical trunnion 43 at its outer end, a cylindrical trunnion 42 and the clamping jaws 5|, 62. The trunnion 43 is provided with an axially extending threaded aperture 63 for receiving the threaded Vshank 64 of a needle screw 65 having knurled head 66, v

Threaded aperture 63 communicates with a needle socket aperture 61`which is also cylindrical and which is located in adiagonally downward andiorward-needle supporting lug 68. The needle supporting lug 68 also extends upward slightly at 69v for the purpose of providing sumcient body for the needle socket 61 to communi-v cate with the bore 63 in order that the needlev screw 65 may clamp against the needle'1il.

The diagonally forward slant of the needle lug l` and socket 61I is such that it gives the needle a suitable tracking characteristic. That is, the needle is disposed at an obtuse angle to thev record, extending backward from the direction of movement of the vrecord so thatit may move along the groove without so much of a tendency to cut in the groove.

` The chuck 43 is also'provided with a collar 1| vof larger size than the trunnion 42 and witha' frusto-conical portion 12 between thecollar 1| and trunnion 42. It also has another frusto'- conical portion'13- between the trunnion 42 land the clamping flanges 6| and 62. The groove or aperture 14 between the clamping flanges 4| and G2 is v`preferably of substantially U-shape conforming substantially to the curvature of the rubber strip 60 except that therefis, a atrec` tangular` clamping .surface 15 on each side of each clamping iiange 6|-and 62 and there is a` suitable clearance at `'||i over `the restof the groove 14.-

The housing I l also provided with inner diag-k nnallv' extendingsuriaces .at l each end of` the cyundncai aperture 'u as indicated'at 11. one

element of these diagonal surfaces-is in the same location asa frusta-conical surface would be.

In some embodiments of the invention, complete I frusto-conical surfaces might be provided on bothends o f the bearing 4|, but the diagonally extending surfaces may perform the same function in simpler embodiments of the invention.

` The rubber sleeve 44 of live resilient rubber is of such size that it extends over'the cylindrical trunnion 42 and truste-conical surfaces 12, 13, and by virtue of its tension, conforms itself to these surfaces. The assembly of the tnmnion venting axial shift -of the chuck'and the resiliency of the rubber sleeve .returns the chuck to its original position after any blow or shock. The amount of compression placed on the rubber sleeve 44, as well as-the blocks 53, 54, rubber 5 cushion $0 and rubber sleeve 30, is predetermined for the purpose of securingthe most desirable characteristics in the' pick-up unit.

The two halves of the housingmay be secured together by bolts and nuts or any convenient o fastening means, but are preferably permanently secured together. with Vthese rubber parts in a state of predetermined compression by means of a plurality of tubular rivets 'I8 passing through aperture 19 in the attaching iianges 22, 23 and 24, and spun or riveted over on'each-side of the.

. flanges.'

The unit is alsopreferably provided with means for providing an adjustable stop limiting the motion of the chuck 43 and this adjustable member may be located on the lower face 8| of the lower housing member and secured in place by a pair of screw bolts 82 which are threaded into` threaded bores inthe lower housing. This stop member 80 may comprise a small sheet metal member provided with a pair of enlarged apertures B3 for reception of the screw bolts 82.

The enlarged apertures permit the lateral movement of the stop member 80 on the screw bolts 82 until they are driven home. 'I'he stop member 8l) may be a sip of metal having a pair of laterally projecting legs B4 separated by a substantially U-shaped notch or groove I5.

The inner surface of the notch Vor groove acts asa stop surface for the depending lug 6l of the chuck 43. The boundary 85 of the notch acts to limit the eective size of aperture 2| in the lowerside of the housingand this stop member derlnitely limits the amount of lateral displacement of the reproducing stylus.

By means of this adjustable plate, it is possible tov provide accurate stops on each side of thel chuck to prevent excessivedisplacement which in turn would readily cause breakage of the crystal element. 'The plate is preferably adiusted after the entire crystal cartridge assembly has been made and after the chuck assembly has taken its natural position with respect to the ,strain that isset up inside the assembly and by the compression that is placed upon the ,rubber and other components. The not h 85 may be beveled at 86 to correspond in slant at its rear surface to the surface of the depending lug `B8 in some embodiments of the invention. y

Another advantage of 'this adjustable. stopy is that the stop may be mad'e accurate, and ad` it may be manufactured justed to compensate for the-diameter tolerances A that are necessary in the die-cast chuck. f

course, the platell is so adjusted that it is not in metallic contact with any vpart of the chuck l; except when the chuck is subjectedto excessive lateral displacement in any of three direcf tions. In the other ,direction the edge surface 81 of the apertureZl at the front may be made to serve as a stop surface.

In addition to the rubber elementspreviously described, the unit is also preferably provided with an additional rubber block 90 which is rectangular in plane and elevation and which is compressed between the lower flange 8,2 of the chuck and the lower wall 49 of the housing.

This block may be made of rubber or printers roll composition and by means of it the resilient torsional characteristics of the assembly are modied and altered so as to eliminate some un-4 desirable characteristics. This block is also compressed when the unit is assembled and it is secured by cement to the lowerhousing half. It is preferably of suillcient length to engage over the :uu width of the aange sz.

It should also be noted that the thrust surfaces 13, 11, 14, 11 on the chuck may also be located at some other bearing vsuch as the bearing in other embodiments of the'invention.

It will thus be observed that I have invented an improved crystal unit cartridge which is adapted to be manufacturedvery economically because most of its parts are made by stamping operations and there is a minimum amount of machining necessary on any part of the unit.

V The chucks are die-cast and the unit requires a minimum amount of rubber in its manufacture.

The needle. chuck is protected against excessivelateral displacement by positive metallic stops and it is protected against longitudinal displacement, such as might change its characteristics or damage the crystal, by a resilient rubber bearing having thrust surfaces.- `rI'he present structure protects the crystal element against breakage by' pressure or sharp blows on thel chuck or needle and the present crystal unit is` adapted to give faithful reproduction although very low cost.

While I have illustrated a preferred embodiment of my inventiornmany modifications may be made without departing from thespirit of the invention, and I do not wish to be limited to the' precise details of construction set forth, but desire to avail myself of all changes within the scope of the appended claims.

Having thus vdescribed my invention,y what 1 claim as new and desire to secure by Letters Patent of the United States, is:

1. In a crystal pick-up unit. the combination of a housing of substantially rigid material, said housingV being provided with ineens for securing one end of a crystal therein and having ya pair of axially extending `bores for supporting vthe trunnions of a chuck, a crystal secured-in said housing, a chuck; having one end secured to said crystal,` said chuck having a pair of trunnions andrhaving a. needle-supportingY socket, onecf said trunnions being provided with thrust surfaces whereby axial displacement of thechuck in the housingv is prevented.

2. In a crystal pick-up unit, the combination of a housing'of substantially rigid material, said housing being providedwith means for securing in large quantities at a` oneend of a crystal .ithereinfand having. a pair of axially extending bores for vsupporting the trunnions of -a chuck, a crystal secured in said housing, a chuck having one end secured to said crystal, said chuck having a pair oi' trunnions and having a needle-supporting socket, one of,

said trunnions being provided with thrust surfaces whereby axial displacement of the chuck in the housing is prevented, said housing being made ofstamped sheet metal members secured together and having a pair of flat surfaces engaging resilient non-metallic blocks for clamping one endof the crystal.

3. In a crystal pick-up unit, the combination' of a housing of substantially rigid material, said housing being provided vwith means for securing one end of a crystal therein and having a pair of axially extending bores for supporting the trunnions `of a chuck, a. crystal secured in said housing, a chuck having one lendsecured to said crystal, said chuck having a pair of trunnions and having a needle-supporting socket,pone of said trunnions "being provided with thrust sur- 'faces whereby axial displacement of the chuck in the housing is prevented, said chuck trunnions` being covered with rubber sleeves and one of said sleeves extending over said thrust surfaces.

4. In a crystal pick-up unit, the combination of a housingl of substantially rigid material, said housing being providedwith means for securing .one end of a .crystal therein and said housing having'a longitudinally extending bore for supporting the trunnion of a chuck, a crystal secured in said housing, and a chuck having one end secured to said crystal, said chuck having means for supporting a stylus, and said housing being formed at the opposite ends of said bore with thrust shoulders, said trunnion being provided with a bearing portion and with thrust shoulders oppositely disposed on the opposite sides of saldfbearing portion for engagement with the thrust shoulders Van said housing to `prevent axial displacement of the chuckin the housing.

5. In a. crystal pick-up unit, the combination of a housing of substantially rigid material, said housing being provided with means for securing one end of a crystal therein and said housing having a longitudinally extending bore for supi porting the trunnion of a chuck, a`crystal secured in said housing, and a chuck having one Lend secured to said crystal, said chuck having means vfcvr supporting a stylus, and said housing being formed at the opposite ends or said bore s with thrust shoulders, said'trunnion being provided with a bearing portion andy with thrust shoulders oppositely disposed on the opposite sides of said bearing -portion for engagement with the thrust shoulderson said housing to prevent axial displacement of the chuck in the housing, said chuck trunnion having its bearing portion and its thrust shoulders covered with a resilient sleeve and said sleeve being compressed in the longitudinally extending bore of said housing.

6. A `chuck for .crystal reproducing cartridges comprising a rigid member having a stylus supporting portion provided with a diagonally extending socket adapted to receive 'a stylus shank,

said'chuck having -an outwardly extending por` ytion provided with a threaded bore 'comm-unicating with said socket and threaded means in said latter bore for engaging the shank of a` stylus, and a bearing for said ,chuck comprisiifa` substantially cylindricaliportion bordered by thrust shoulders at each end thereof, said shoulders Yforming thrust members for ensuing with a housing bearing to prevent axial movement of said chuck.

'1. A reproducer chuck assembly comprising a metal chuck having a pair of axially aligned trunnions and'having a body member provided with a needle socket, one of said trunnions being formed with a pair of oppositely disposed thrust surfaces, a rubber sleeve element on said latter trunnion and extending outward over said thrust surfaces -anda housing having a bearing aperture for engaging said bearing, said housing also having surfaces which are opposed to the outer surface of said rubber-covered trunnion whereby axial movement of the trunnion in its bearing is prevented;

8. A reproducer chuck assembly comprising a metal chuck having a pair of axially aligned trunnions and having a body member provided 'with a needle socket, one of said trunnions being formed with a pair of oppositely disposed thrust surfaces, a rubber sleeve element on said latter trunnion and extending outward over said thrust surfaces and a housing having a bearing aperture for' engaging said bearing, said housing also having surfaces which are opposed to the outer surface of said rubber-covered trunnion whereby axial movement of the trunnion in its bearing is prevented, said housing comprising a pair of stamped sheet metal members and said bearing aperture being formed by two registering grooves pressed in a ridge formed between` two diagonal r surfaces on said housing.

9. A chuck for crystal reproducing cartridges comprising a rigid member having a stylus supporting portion provided with a diagonally extending socket adapted to receive a stylus shank, said chuck having an outwardly extending portion provided with a threaded bore communicating with said socket and threaded means in said latter bore for-engaging the shank of a stylus, and a bearing for said chuck comprising a substantially cylindrical portion bordered by thrust shoulders at each end thereof, said shoulders forming thrust members for engaging with a housing bearing to prevent axial movement of said chuck, and a compressible bushing of live resilient material extending over said bearing portion and curved outwardly on said thrust shoulders for engaging a restricted portion of' said housing.

10. In a crystal reproducing cartridge, a pair of rigid housing members formed with a recesss for receiving a crystal member, said housing members being provided with resilient blocks for engaging on the opposite sides of one end of said crystal member and said housing having at its opposite end a restrictedaperture forming a bearing for a chuck, a stylus chuck connected to said crystal and extending longitudinally of said housing, said stylus chuck being formed with a stylus socket and means for securing a stylus shank' in said socket, said chuck being formed with a portion of reduced size at said restricted aperture bordered by enlargements at each end of said latter portion, and a covering of live resilient material compressed between the restricted aperture in said housing and the reduced portion of said chuck, for securing the chuck against axial movement and permitting free floating movement of said chuck.

11. In a crystal unit, the combination ci a pair of metallic housing members of substantially similar shape except that one of said housing members is provided with a needle aperture, each housing member being provided with a borderl rim for engaging the border rim on the other housing to effect a closure at the edges of the housing members and each housing member being provided with a flat attaching flange located at the end thereof, a crystal unit assembly in said housing including a crystal secured to a chuck,

said chuck having bearings and resilient means interposed between said assembly and said housing and brought into resilient clamping engagement with said assembly when the housing is assembled, said housing members and said chuck being provided with thrust bearing surfaces for one oi' said trunnion members being provided with a threaded aperture for a clamping screw, said threaded aperture communicating with the stylus socket, one of said trunnion members being provided with opposed thrust surfaces for reacting against surfaces in the housing to prevent axial movement of the chuck.

13. A chuck for crystal reproducing cartridges, comprising a metal member formed with a diagonally extending socket for a stylus, said chuck also having a pairof aligned trunnion members. one of said trunnion members being provided with a threaded aperture for a clamping screw, said threaded aperture communicating with the stylus socket, one of said trunnion members being provided withopposed thrust surfaces for reacting against surfaces inl the housing to prevent axial movement of the chuck, said chuck having a sleeve of live resilient material on said trunnion and extending outwardly over said thrust surfaces. a

14. A chuck for crystal reproducing cartridges,

comprising a cast metal member formed with a cylindrical trunnion portion extending rearwardly from a diagonally depending socket portion, said socket portion having `a socket for receiving a stylus, and said chuck having a forwardly extending threaded bore communicating with said socket, a threaded clamping member in said latter bore for engaging a stylus, and a pair of tapered surfaces located on said trunnion at each end of said cylindrical portion, said tapered portionsand cylindrical portion of said trunnion being covered with aytubular soft resilient covering adapted to serve as a movable bearing member for permitting predetermined movement of saidchuck and preventing excessive'longitudinal movement of said chuck.

l5. In a crystal pick-uo unit, the combination of a housing of substantially rigid material. said nion of a chuck. a crystal secured in said housing, a chuck separate from the crystal and having one end secured to said crystal, said chuck having a trunnion and having a needle-supporting socket extending transversely to the axis of said trunnion, said trimnionbeing provided with a thrust surface whereby axial displacement of the chuck in the housing is prevented, said chuck trunnion being covered with a rubber sleeve and said sleeve extending over said thrust surface.

16. A reproducer chuck assembly comprising a metal chu'ck having a: trunnion and having a body member `provided with a needle socket.

said trunnion being formed with an inwardly facing thrust surface, a rubber sleeve element on said trunnion and extending outward over `said thrust surface, and a housing having a bearing aperture for supporting said trunnion, said housing also having a surface which is opposed to the thrust surface of said rubber-covered trunnion whereby inward movement of the trunnion in its bearing is prevented.

17. A. chuck for crystal reproducing cartridges comprising a rigid member having a stylus supporting portion provided with a diagonally extending socket adapted to receive a stylus shank,

' said chuck having an outwardly extending portion provided with a threaded bore communieating with said. socket and threaded means in saidl'atter bore for engaging the shank of a stylus, anda bearing for said chuck comprising a substantially cylindrical portion bordered by a thrust shoulder at one end thereof, said shoulder forming thrust means for engaging with a hous^ ing bearing to prevent axial movement of said chuck, and a compressible bushing of live resilient material extending over said bearing portion and curved outwardly on said thrust shoulder for engaging a restricted portion of said housing. v

v 18. In` a crystal reproducing cartridge, a pair of rigid housing members formed with a recess for receiving a crystal member, said housing members being provided withresilient blocks for engaging on the opposite sides of one end of said crystal member and said housing having at its opposite end a restricted aperture forming a bearing for a chuck, a stylus chuck connected to said crystal and extending longitudinally of said housing, said stylus chuck being formed with a stylus socket and means for securing a stylus shank in said socket, said chuck being formed with a portionfof reduced size at said restricted aperture bordered by an enlargement located outwardly of said latter portion, and a covering of live resilient material compressed between the restricted aperture in said housing and the reduced portion of said chuck for securing the chuck against inward movement and permitting free floating movement of said chuck.

19. In a crystal unit, the combination of a pair of metallic housing members, one of said housing members being provided with a needle aperture, each housing member being provided with a border rim for engaging the border rim v on the other housing to ei'ect a closure at the edges of the housing members and each housing member being provided with a fiat attaching flange located at the end thereof, a` crystal unit assembly in said housing including a crystal secured to a chuck, said chuck having a trunnion and resilient means interposed between said chuck and said housing and brought into resilient clamping engagement with said chuck when the housing is assembled, said housing members and said chuck being provided with a thrust surface for preventing inward displacement of said chuck beyond a predetermined point.

20. A chuck for crystal reproducing cartridges, comprising a metal m'ember formed with a transversely extending socket for a stylus, said chuck also having a trurmion member, said member being provided with a threaded aperture for a clamping screw, said threaded aperture communicating with the stylus socket, said trunnion members being provided with a thrust surface for reacting against a surface in the housing to prevent inward movement of the chuck.

21. A-.chuck for crystal reproducing cartridges, comprising a metal memberformed with a socket for a stylus, said chuck also having a trunnion member, said metal member being, provided with a threaded aperture for a clamping screw, said threaded aperture communicating with the stylus socket, said trunnion member being provided with an inwardly facing thrust surface for reacting against a surface in the housing to prevent inward movement of the chuck, said chuck having a sleeve of live resilient material on said trunnion and extending outwardly over said thrust surface.

22. A chuck for crystal reproducing cartridges, comprising a rigid member formed with a cylindrical trunnion portion extending rearwardly from a socket portion, said socket portion having a socket for receiving a stylus, and said chuck having a forwardly extending threaded bore communicating with said socket, a threaded clamping member in said latter bore for engaging astylus, and a tapered surface located on said trunnion at one end of lsaid cylindrical portion, said tapered portion and cylindrical portion of \said trunnion being covered with a tubular soft resilient covering adapted to serve as a movable bearing member for permitting predetermined movement of said chuck and preventing excessive longitudinal movement of said chuck.

23. In a, crystal reproducing. cartridge, a pair of housing members formed with a recess for receiving a crystal member, resilient means for clamping 'one end of the crystal member in said housing, a chuck engagingfthe other end of said crystal member, said chuck having a trunnion for` support by said housing, said housing having a `restricted portion for engaging said trunnion, and said trunnion and housing having opposed thrust surfaces for,v preventing inward movement of said chuck, which mightl damage the crystal, said chuck having a stylus socketi and having a threaded member engaged in a threaded bore communicating with said socket, and resilient means surrounding said trunnion and compressed in `said restriction in said housing, said resilient means alsoextending outward betweenthe thrustA surface on the housing and the, opposed thrust surface o'n the chuck.

'ROY DALLY.

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