US1881942A - Pickup arm - Google Patents

Pickup arm Download PDF

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Publication number
US1881942A
US1881942A US539310A US53931031A US1881942A US 1881942 A US1881942 A US 1881942A US 539310 A US539310 A US 539310A US 53931031 A US53931031 A US 53931031A US 1881942 A US1881942 A US 1881942A
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Prior art keywords
arm
translating
axis
pivot
stylus
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Expired - Lifetime
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US539310A
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Raber Joseph
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RCA Corp
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RCA Corp
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/02Arrangements of heads
    • G11B3/10Arranging, supporting, or driving of heads or of transducers relatively to record carriers
    • G11B3/12Supporting in balanced, counterbalanced or loaded operative position during transducing, e.g. loading in direction of traverse

Description

Oct. 11, 1932. J. RABER 1,881,942
' PICK-UP ARM Filed Ma 22, 1931 Fig.1.
I N VENTOR.
Jo eph Haber;
Patented Oct. 11, 1932 warren stares QPATENT'VTQFFICEHY JOSEPH BABER, or HADDONFIELD, NEW JERSEY, Assielvoa, BY MESNE ASSIGNMENTS, ro name ccaronATior-i or mansion, on NEW YonK,,n. Y., A cortroaa'rion'or DELAW'ABE PICKUP ARM Application filed May 22, 1931. Serial No. 539,310;
-The present invention vrelates to electric sound translatlng apparatus and more particularly to a unitary part thereof which may be termed the sound translating unit. Such a' unit includes the 61601311? sound translatingdevice, or electric pickup, and the suspension means therefore, by which it is 'mountedin the sound translating apparatus and permitted to move in operating relation to thesound record.
A unit of the above character provides for carryingthe electric pickup device at one end of a beam or arm which is pivotally mounted adjacent its opposite end in a suitable swivel pedestal or supporting means and thearm is suitably counterweighted to compensate for the weight of the pickup device and provide the desired pressure of the stylus of the pickup device upon the record or sound I track.
Sound translatingunits ofthis character known heretofore have assumed various forms and have embodied a varlety of mounting means for the supporting arm or beam I requiring a relatively large clearance space in the cabinet structure of the apparatus, for properoperation. a
It is an object of the present invention to provide an improved electric sound translating unit of the type embodying an electric sound translating dev1ce,-a suspension arm and a supporting pedestal therefor, which, while permitting full operat ng movement oi the tranlatin device, is of compact construc- I tion adapted to operate in a space of greatly reduced dimensions from that heretofore known. V I
1t 15 a further ob ect of the present invention to pro *ide an electric sound translating unit of the above character, the elements ofv which are arranged to provide for easier operation and which have an improved operating characteristic.
The invention wlll, however, be better un- In the drawing Fig; 1 is aview inperspec} J tive on a reduced scale of an electrical sound translating unit embodying the invention; Fig-.2 1s a cross sectionalviewionlthe same scale of a portion ofthe' unit shown in- Fig. 1,
further illustrating the construction there: of Fig. Sisa cross sectional view of a portion of the unit shown in 2 taken on the section line 3+3; Fig. 4 is a cross sectionalview of the electric soundjtranslating device or pickup; and F ig. 5 is a side view on substantially the same scale,of a modification of a portion oft-he unit shown in Figs, 2 and 3.
Referring to Figuresl, 2, 3, aud t of the drawing 8 is a soundtranslating device which mounted upon an elongated suspension arm9 in turn supported by a swivel pedestal 10 provided with: a suitable. counter weight means 11 for the translating device. The pedestal is mounted ina sound translating apparatus 12 and is arranged'to carry the translating device 8 inoperating relation to a sound record 13 WlthWhlOll, in Flgure 1,
the stylus 14 of thesoundtranslating device isshewn in operating engagement.'-
The suspension arm is enlarged or flared at its end opposite the translating device and provided with flanged, edges 14 adapted to enclose the upper end of the pedestal 10, and
the counter weight means 11. The latter is a secured tothe arm and is arranged to lie-between two spaced parallel ears 15 provided upon the pedestal 10.
The axis of :rotation for the pedestal is provided by a central hollow pivot pin 16, and
substantially in alignment therewith amidst a right'angle thereto there is provided a horizontalpivot axis'provided by a pivot pin 17 for'the suspension arm about whichit may be moved-to lift'the translating device from the record and to return it thereto. This op eration is necessary for changing records andfor changing the needle of the stylus 14 and V is the usual pivot axis employed in known suspension means for sound translating devices of this character; 7 v a In the present example, however, and in accordance with the invention, there sgprovided a second pivot axis or pivot pin :18 1
parallel with the firstand' spaced therefrom preferablyin advance of the axis 16 andiin advance of the axis 17 toward the translating 16o.
device. 7 This axis is providedby a second pivot pin 18; This is covered by a body of vibration absorbing material such as a sleeve or tube 19 of rubber or other suitable resilient material. The pin 18 iscarried at its ends 1 and secured to the flanges 14 of the flanged portion of the'armand the sleeve 19 rests adjacent its ends in a saddle in the pedestal provided by parallel notches 20 in the ears 15. f Itwill be seen that the arm 9 may be lifted about the axis 17 whereby the pivot axis 18 will be caused to move with the farm about i the axis 17. This permits advantage to be taken of the full length of. the suspension arm weight is obtained, however, hy permitting thearm to pivot about the axis 18 when the stylus of the translating device is in engagementwith the record 13. This is provided by permitting a slight operating movement of the arm about the pivot axis 18 by the arrangement of the pivot axis 17 as indicated in the drawing. The pivot pin 17 is. carried by the flanges 14 of the suspension arm 9 in the same manner as the pin 18. The pin 1? is then journaled in the ears 15 in loose bearings provided-by enlarged openings or apertures 22in the ears, of a diameter suificient to permit'a slight movement of the arms about the pivot axis 18 as the stylus of the translating device follows the irregularities in the movement of the record surface in a vertical direction. V i
The suspension arm is thus arranged to rotate in a single plane about two separate spaced parallel axes provided by two spaced parallel pivot pins 17 and 18 which in turn are at aright angle to the pivot pin 16 for the pedestal. The pedestal is provided with a loose bearing for the pivot pin17 and a saddle 7 type of bearing for the pivotpin 18, the latter being provided by extending the pedestal forwardly as indicated more clearly in the cross-sectional view: provided by Figure 2; The movement of the arm about the axis 18 is such that when the arm .is in the-operating position and the stylus is resting upon a record, as shown in Figure 1, the excess weight of the translating device upon the record above that desired for proper stylus pressure isJcounterbalanced' by the weight lltothe rear of pivot pin 18, and rotation takes place during the record translation about the pivot pin 18. The difference in diameter between the pin 17 and that of the apertures or openings 22 in the pedestal provides suflicient play to permit the. stylus to accommodate itself to any vertical irregularity that may be encountered in the surface of'the record. The pivot pin 20 and its resilient sleeve 19 resting in the notches 20 may be'freely disengaged provided by the pin 17.
'By the construction shown and described, whereby a separate pivot axis is employed for the translating process, the counter weight 11 may thus be located in a more forward position over the pedestal 10 and hence takes up a minimum of space to the rear. This weight is made effective by the change of the pivot axis. 7 I
It will be noted that the translating device and arm, including the counter weight, lie in substantially a common horizontal plane passing substantially through the pivot axes 17 and 18. VJith this arrangement, asound translating unit of minimum height is obtained and as indicated more clearly inFigure 4 by providing that the axis of rotation 23 of the stylus 14ilies in the extension of the arm 9 and substantially in a common plane therewith, an improved operatingcharacter istic is obtained This is for the reason that with the'axis 23 of the stylussubstantial'ly in the plane of the arm, a lesser torsional; vibrationis imparted to the arm by movement of the stylusf V I I In the present example, the stylus is'provided with an armature 24 located in an electrical pickup coil 25 and provided with a suitable field magnet 26 and a cover means 27.
The pickup coil 25 is provided with output leads indicated at 28. This represents any suitable electrical-or other sound translating device, the general arrangement of which is such that it lies substantially in continuation and in the plane of the suspension arm 9.
This construction has the advantage that,
as above mentioned, in height or vertical depth, the unit is reduced to a minimum dimension and lmproved response is provlded because of the reduction of torsional vlbration from the stylus being translated to the arm. 7
It should be noted that the stylus 14 is arranged to lie at an acute angle with respect to the pivot axis 23. In operation, this arrangement provides for smooth operation of the stylus in the record track and that the pivot axis 23 lies substantially parallel to the record surface. 1
Referring now to the modification shown in'Fig. 5, the two axes corresponding.respectively with'those defined by the pins .17 and 18, in Figs. 1, 2, and 3 are connected by a link ed through extension's'31,'by cross member 82. The pedestal 33,. onwhich a suspension arm 9vis pivotally mounted, is provided at its'upper end with a yoke 34,having spaced ears 85, (one of which is shown), andthe side members 30 are pivotallyconnected herewith.
by pivot pins 36, (one of. which is shown), and tothe arm by a pin 37. Thepins 36 define the axis of rotation corresponding to that defined by the. pin 17 in Figs. 1, .2, and'3, and the pin defines the axis corresponding to the axis as defined by the pin 18 in saidfig ures. In this construction, the pin 37 is not the pin 18 in Figs. 1, 2 and 3 and by the pin disengageable from the'link or'from the arm, the said link being rotatable with the arm, in moving the stylus to and f'roin'piayin g position.
The link 29 is held, in a horizontal position during the translation of a record by abutment of the rear edge of the cross member 32 against the yoke 34:. There is no connection between the arm 9 and the pedestal on the pivotal axis defined by the pins 36. In consequence, when the arm45 is in playing position, allrotation will occur around the axis defined by the pin 87.
The moments about the pivotal point, definedby the pin 37 in Fig. 5, are similar to the moments described in connection with and coaxial with the longitudinal axis of the. arm. Furthermore, two parallel pivot axes are provided for the arm, one of which lies in' a more forward position toward the translating device with respect to the other, and that these axes'lie in the plane of the armin common with the counter weight 'means. This arrangement reduces the space" required to the rear of the arm'f-or the reason that the counter welght is carried in a more forward osition with respect to the main pivot axis. It should be noted that the axis defined by 87 inFigc5, is located as far forward as practicable toward the. translating device, to utilize a greater portion of the mass of the arm as part of the counter weight structure whereby the moment on the side of this axis toward the translating device above that required for faithful tracking of the stylus in a record groove, and the mass of the counterweight, maybe reduced to a minimum. The
Figs. 1, 2, and 3, so that the counterbalance purposes may thus be'materially. reduced as compared with commonly known construc-' tions. of this character and, in consequence, :the pro ect1on ofxthe arin rearwardly of. the pedestal may be minimized. time, zontal rotation of the unit about its vertical axis, as is desirable for faithful translation of" a recordis preserved. p
AlthoughI have shown and described cer- At the same the desiredlength of the radius of horiadded mass required for 'counterbalancingi v tain specific embodiments of my invention,
I am :fully aware that'many modifications My invention, therei fore, is notto be restricted except insofar as byuthe;
thereof are possible.
is necessitated by the prior art and spirit of the appended claims;
Iclaimas my invention: p
In an apparatus of th'efcharacter described, a-sound translating device, an -arm for supporting said device, a supporting means for the arm, a-nd vmeans providing spaced parallel of rotation between the arm and the support therefor, said arm being.
rotatable relative to the supporting-.means selectively about said axes.
l 2. In an apparatus of the characterdescribed, a fixed supporting pedestal, a sound translating device, an arm forisupporting said device, and means. providing space respect to said'pedestal, one of said axesjbe ing arranged torotate about the other.
3. In an-apparatus of the. character described, a fixed suportingpedestal, a sound translating device, an arm forsu-pporting said device, means providing spaced parallel axes ofrotation for said armawithrespect to saidpedestal, one ofsaid axes being arranged to rotate about the otherfa movable stylus for said device, and means providing a pivot axis for said stylus substantially in the plane of said armn 4; In an apparatus of the:character described, the combination of a support, asound translating device, a suspension arm for said device, and means providing substantially parallel axes of rotation for'lsaid arm about said'support, said axes being so spaced and related that the arm may be moved about one of said axes during sound translation, and
d parallel axes of rotation for said arm withabout-.the other in moving'the translating device to or froma sound translating posi-v tion. v
5. In an apparatus of the character descrlbed, the combination of a supporting ped-' estal, a sound translating device, a suspension I arm for said translatmg device, said arm having a pair of pivot axesabouteither of which selectively the arm is movable in the same plane, and pivot means-for said arm arranged to permit movement of said arm inia plane at zs angle to said first-named plane.- 7
1-6. In an pparat s {bf streamer de. 39-
scribed, the, combination of a pedestal, Ya sound translating device, a suspension arm for said translating device, said arm having a pair of pivotaxes .about which the arm is -movable in substantially the same plane, a
movable stylus for said device, and means providing a pivot axis for said stylus substantially inthe plane of the arm.
7". In combination, a sound translating de vice, a suspension arm therefor havinga longitudinal axis, a support for said arm, means prov nga pair'of pivotaxes for the arm ar- 7 ranged to permit rotational movementof the arm with respect to the support, a stylus for the longitudinal axisof said ar said device, and means providing a pivot axis for said stylus substantlally coaxial wlth.
;8. In a device of the character described, an elongated SllSPQIlSlOII arm, asound translating dev1ce secured .to said arm and having a body lying substantially in the plane thereof, said device having a'movable armature,
' and meansproviding a pivot axis for said said device.
armature lying substantially in extension of the:longitudinalaxis of the arm. V
9. In a sound translating apparatus, the
combination of a sound translating device, a
movable suspension armto which adjacent one end said devlce 1s connected, means providing a horizontal axis of movement for said armat apoint along said arm, in spaced relaaxis for swinging the arm in a horizontal direction, a horizontal pivot means arrangedto pivotally connect the arm and thepedestal to permit movement of the arm in a vertical plane,a secondpivot means located between the first-named pivot meansand said device,
- saidsecond-named pivot means being movable with respect to the pedestal in a vertical plane about the axis provided by said firstname-d pivot means.
' 11,.In a device of the character described,
a sound translating device, a suspension arm I therefor, a pedestal for said arm, means prowith said arm and extension viding a horizontal extension for the pedestal, 'meansproviding a pivotal connection between the pedestal-and arm defining an axis .ofrotation for movement of the arm in a vertical plane, and means providing a second axis ofrotation for the arm providing for movement of the arm in the same vertical plane, said last-named means being movable first-named axis. 7 r q 12. In a phonograph apparatus, a sound translating device, an arm'su'pporting said means about the device, means providing a pair of pivotal? axes spaced along said arm about wh ch the arm is adapted to have pivotal'movement se' lectively; one of said axes being more remote from thetranslating device than the other in a direction along said arm. V
' 13. The combination with a-sound translating device, of a. supporting arm therefor, said arm and 'device being arranged to lie in a common plane, a supporting means for the armprovided with a pivot-axis perpendicular to said plane, means providing a. pivot axis between said arm andsaid' su'pport'in the plane of the arm and at a right angle to the first-named pivot axis, and means providing. a second pivot axis between the arm and the support.
14. A sound translatin unit' comnrisin in combination a sound translating device having a stylus adapted to engage arecord surface at an angle thereto and a. pivot axis for said stylus arranged to lie substantially parallel. with a record surface when the stylus is in engagement therewlth in operatlon, a suspension arm for'the translating device arranged to lie in a common plane with the axis of said stylus, a support for the arm adapted to be pivotally mounted, and means providing two spaced parallel pivot axes for] the arm in connection with said support.
15. A sound translating unit comprising in combination, a sound translating device,
a suspension arm therefor to which saiddevice is connected adjacent one end, said arm and said device being arranged to lie substantially in a common plane,ja supporting pedestal for the arm connected therewith in spacedrelation to the translating device, a
pair of spaced parallel pivot axes in said connection about which said arm, is movable 1n the-same plane, and meansfor causing one of said pivot axes to become effective as V a pivot axis for the armwhen in a playing" position and for-the other pivot axis to become effective when the arm isin': a raised position from the playing position.
16. A sound translating-unit comprising 1n comblnation, a sound translat ng device,
a suspension arm therefor, a counterweight means for said arm, an operatingpivot axis forsaid; arm between said counterweight and said translating device, and means for caus ing said pivot axis to shift to a predetermined position away from said translating device when said arm is raised from the operating position.
In testimony subscribed my name this 19th r r JOSEPH RABER.
whereof, have hereunto day of May,
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434033A (en) * 1945-05-23 1948-01-06 Wilcox Gay Corp Tone arm mounting
US2619352A (en) * 1947-06-19 1952-11-25 Magnavox Co Phonograph pickup arm and mounting
US2625400A (en) * 1948-08-19 1953-01-13 Philco Corp Phonograph tone arm

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434033A (en) * 1945-05-23 1948-01-06 Wilcox Gay Corp Tone arm mounting
US2619352A (en) * 1947-06-19 1952-11-25 Magnavox Co Phonograph pickup arm and mounting
US2625400A (en) * 1948-08-19 1953-01-13 Philco Corp Phonograph tone arm

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