CA1058093A - Viscous damping arrangement for record player tone arms - Google Patents

Viscous damping arrangement for record player tone arms

Info

Publication number
CA1058093A
CA1058093A CA284,205A CA284205A CA1058093A CA 1058093 A CA1058093 A CA 1058093A CA 284205 A CA284205 A CA 284205A CA 1058093 A CA1058093 A CA 1058093A
Authority
CA
Canada
Prior art keywords
arm
attached
pick
reservoir
container
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA284,205A
Other languages
French (fr)
Inventor
Constantinos J. Joannou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CA284,205A priority Critical patent/CA1058093A/en
Application granted granted Critical
Publication of CA1058093A publication Critical patent/CA1058093A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G11B3/14Supporting in balanced, counterbalanced or loaded operative position during transducing, e.g. loading in direction of traverse by using effects of gravity or inertia, e.g. counterweight
    • G11B3/18Damping by using viscosity effect

Abstract

Viscous Damping Arrangement for Record Player Tone-arms Abstract of the Disclosure This invention relates to a viscous damping arrangement for record player tone-arms in which the fluid container is part of the arm and is located at the arm s centre of rotation.
A stationary sphere is immersed in the fluid and the container rotated around it.

Description

l~D~ 3 In pre~nt high fidelity record player tone-arms vlscou~ damping ls used to dampen resonant respon~es. ~he ~rrangemeNt U8Ually consi~ts of a~
inverted cup attached to the arm, and the open end of the cup i~ ~m~ersed ln vlscous fluid co~tained in a clrcular trough ~hlch i9 ~ixed to the statlonary base o~ the tone-ar~ ~his arra~gem~ ha~ two dl~advantages:
a) ~he ~luid ca~ be spilled i~ the tone-~r~ (or record player) i~ ~hipp~d with the fluid in it. A~ a result, the flula i~ pack~ged in a ~epaxa~e sealed container and the custo~er i9 expected to trans~er the fluid to the tone-ar~. Al80~ this ~rrangement ~kes lt di~ficult ~o ser~ice a record -~
pl~y2r with such a tone-ar~ on it since the tone-ar~ h~s to remain in a horlzontal posltion;
b) ~hls arrange~e~t doæ8 not provide ~or equal coe~ficient o~ Yi5Cou9 ~rictlon when the ~r~ rotateR in the vertlcal and horizontal pl~nes.

My present inve~tlon h~8 the advantage o~ elimin~ting these di~flcultles.
It is an obJect o~ ~y lnvention to provlde a viscoua damplne arran~e~ent ~or r~cord player tone-ar~ in which th~ vi8cow ~luid can be readily sealed to facllltRke msintenance a~d shlp~ent.
An~ther ob~ect of ~y invention i8 to provide equal vl~cous frictlon coe~
cient ln both ~ertlcal a~d horiz~t~l ve~ents o~ the tone-ar~.
2Q Y~t another obJect o~ E~ lnventlon is to proviae a vi~cous damplng arra~ge~
~e~t ~hich can be used ~lth tone-ar~ ha~lng di~ferent types o~ suspen~ion sy~te~s.
The~e ~nd other aapect~ o~ ~y inYentlon are de~cribed ln the following di~clo~ure 8nd dra~in8~-Flg. 1 ls a pictorial ~iew ~howing the arm ~ith the Yi8CoU~ rlUld containerincorporated i~ a g~bal suspension type of tone-ar~;
Fig.2 is a cross-section~l vlew of the glmbal type tone-ar~ ~owing the ~luid con~alner and the ~tatio~ary sphere;
Fi~. 3 i~ the 8a~e view as that o~ ~lg. 2, but with the shlpplng bloe~s ln 3o plac~ and the ~luld container sealed;
Fig. 4 i~ a plctorial Yie~ ~howi~g the n uid container and sphor~ sy~te~
in a taut-b~nd auspension type tone-arn;
Plg. 5 ~how8 the tone-ar~ o~ Fig. 4 in pro~ile, with the container and sphere arrangement ln greater detail;
~g. 6 i~ tho ~0me view a~ ~ig. 5, but ~th the shipping blocks in~erted ~d the ~luid co~tainer sesled.

, .

6~

In ~lg. 19 1 i~ the a~a of the tone-ax~ as~em~ly suFportlng cartrid~se 2.
3 18 a cylindricsl ~iscou~ ~luld Gontalner on ~hlch a2q~ 1 ~nd col3nterbalance support ahank 4 a:re attacl~d. 5 ls the counterbalance o~ the a~m. 6 i8 a gimbalin the ~orm o~ a rlng whlch ~port~ container 3 vla two horiæo~t~l bearing8 7 ~t o~ lte sid.e8 of the ring, Ring 6 i8 3u~orted ~y ~Daln fr~me 8 vla ~wo rtical be~i~8~3 (Fi~. 2~. Maln frame 8 is ~ixed to base lO ~hich 1B nonnally mounted on a record player. ll 18 a U-shaped meslber a~ixed to ~ln *~ e 8 aI~d its pu~ose i~ to 3upport sphere 12 (Fig. 2) ria scre7~ 13 and hollow ~h~$t 14~ 15 i3 a ~cr~w rotainin~ ~pring 16 ~ich pr2sæes ~gainst u~per b~lng 9.
10 17 i~ an QdJusti~ crew ror ad~usting the die~ ce bet~een bes~ 9 0nd tllus adJu~ting the play ln ~he bea*i~ 0 Note that the ra~es of beal~lg8 9 ~i-l; 1008elg ln thelr sea~- 18 are pointed ~a~t8 fixed to ,3i~nbal 6 aIld fo~
p0~l; of the bearing ~rar~e~ent. 19 i~ a cover ~or container 3. Co~r 19 has a hole i~ lts cen~re which i~ con~idera~ly larger than hollow sha~t 14, thus allawi~g the co~tainer and cover to rotate sll~htly ln the vertica:L
plane (around bear~lg~ 73. Al~o~ cover 19 i9 shaped 80 that when fltted onto container 3, the in~ide o~ the CoRtai~er and the cover ~orm a spherlcal cavlty which 1~ larger than ~phere 12~ thus allowing space ror viscou~ rluld 20.

The arra~ge~ent described above operate~ as ~ollo~s: Durlng norIal opera~ion o~ the tone-ar~, the arm is free to ro~ate by a s~all ~mount In ~ horizo~tal pla~e via bearings 9a The rota~ion i8 limited onl~ by ~imbal 6 touching ~ember 11. When the arm ro~ates ln the horizontal plane~ container 3 and cover 19 rota~e arou~d sphere 12 whlch ia ~ta~lona~y. since there is Yi~cous ~luia betweea the container a~d the sphere~ viscou~ frictlon is provlded and the ar i~ viAcously d~ed. q~h~ 8~ h~ppex~s when the ar~ rotates in the vertical plane. A~d since the a;rr~,ement i3 ~etrlcal in a vertical and horl~orltal pla~e~ t~e coefflclent o~ ~rlction is the 9~ in both ca~esD

Another feature o~ the s~ran~ement descrlbed i5 that the fluid container can be ~ePled for ~ervice or shipmen~. To Aeal the contalner~ block~ 21 are 3o in~erted between ba~e 10 ~d contalner 3, thus li~lng up the whole ~/con-tainer assembly as ~hown ln Fig. 3. ~hen thi~ hap$)ens9 u~per 9h~t 18 lifts upper bearlna 9 again~t sprlng 16 a~d the t~p of co~rer 19 presse~ again~t re-silient rillg 22~ thu~ ~ealinB the Vi~CoUB ilu~d ln the contalner.

Fig. 4 3h~u~ the sa~ viecous nuid dE~ping arranee~ent ln a taut-band 8ugpen810n type tone-arm ~Re~. Pat~ No. 934,~03 ). 23 i8 the outer hou~lng o~ the tone-arm which 1~ rlxed to the r~cord player~ 24 18 a top cover o~ the houslng whlch i8 provided with kno~ 25. Khob 25 turn~ hollow 8ha~t 26 and thus twists cord~ 28 to proYide antlskatlnB torque. 27 ls a 3tati~nary member ~hich ~s
- 2 ~

~)5~3 held ~irm on how ing 23 by cover 240 Member 27 ~upport3 ~phere 12 via hollow sha~t 14 and serew 13. V~cou~ ~luld co~tai~er ~ i8 ~u6pended on cords 28 an~ 29 ~ia ~ha~te 30 (iixed to 3) and U-~haped m~berB 31. Cords 29 are wo~nd o~ce around 3ha~ts 39 and cord retalning screw~ 32, All cords are ~tretched by leaf~særing elemen~ 33 at the ba~e of hou~in~ 23~

~peration of th~s ~ype o~ tone-ar~ t8 a~ ~ollows: The ar~ i8 free to rota~e in a hori~on~al plane. ~hen this happene~ cord~ 28 twist and o~er no re8i~t-ance. Contain~r 3 r4tates w~th the ar~ ara~nd stationary sphere 12 ~nd d~e to vi~eou3 ~luld 20 being pre~ent bet~een the sphere and eontai~r 3 Yi~cous d~mping i~ providgd. The arm rotatlo~ in the hsrizon~al plane ~B limitea by the lenBth o~ 310~s~ 35. ~he ar~ i5 al80 rree to rotate partla~ly ln a ver-~lcal plAne- Xhi~ ~vemc~t i8 lim~ted by the wi~th Or slote 35~ When thi~
hQppens, the uFper part8 of cords 29 wlnd and the lo~er part~ o~ cords 29 unwind on ~ha~t~ 30, thus again offering no re~istance9 conta~ner ~ rotates around ~phere 12, and ~ain due to viscous ~luid 20 viscous d$mping is providedO

Fi~. 5 and Fl~. 6 æho~ ho~ the ~is~ous fluld 1~ the tau~-band type tone-~rn can be sealed~ Fig. 5 sho~ the tone-arm in normal operation, and Fig. 6 shows the tone-arm with shippi~g blocke 34 lnserted in slots 35. When th~
~hlpplng blocks are i~serted9 the arm with the ~l~id container ~nd cou~er-w~i~h~ t~ up~ards and the top o~ cover 19 pre~ses a~ainst resiliç~t rlns 22thus se~l~ng the ~luld ln ca~talner 3. ~ote that the su3pen~ion s~te~ allo~9 ~om# vertioal m~em~n~ of the arm as~embly. ~hen the as3embly i9 mo~ed ~p-wards~ lower cord 28 pu119 leaP spring 33 which flexes ana t~u~ a110~B ve-~ont in thi~ direction.

It 1~ intere~ting to note here that the viscou~ da3ping arrangeeent described here also dampen~ ooclllation~ along the axi~ of the arm ~hlch may be ~et ~p by the co~pliance of the taut-ba~d sllspension and the maa5 oi~ the ~ assembly.

It 13 posslble to use ~ dif~eren^t ~hape of st~tlona2~r element i~r0ed in the ~i~cous rlui~ inste~l of sphere 12. Yor inst~nce, a di8c or a cu~ may be 30 usedJ whlch a~e sl~pler to n~Sacture. Al~o, to increa&e the coef~icie~t o~
ri6cou~ ~ri¢tion, a ~phere (or ~ng other ~ ith ~lns or protru~ions on lt~ ~ace ~ay be u~ed.

It is alao po~ible to a~r~ge the suspen~ion system 90 tha.t the container and
- 3 - :

a SSem J~
a~m ~ i8 ~ovea~le in the do~xd dlreckiorl a~d a re~lllont rlng ~an b~ provided ~Lt the top oi the sph~re under co~rer 19. By ~ring the co2rtainer ards, the re~llie~t r~ rill clo~e the hole o~ cover 19 and t}~us se~l the container froD~ inside~

Claims (4)

What I claim is:
1. A viscously damped record-player tonearm comprising: a stationary frame member; a pick-up arm with counterweight; a hollow container con-taining viscous fluid, said container being open at the top and being attached to said pick-up arm near said counterweight; a suspension system comprising a gimbal arrangement which rotatably attaches said pick-up arm and said counterweight to said stationary frame via said viscous fluid container in such a way as to allow said pick-up arm to rotate freely in the vertical and horizontal planes about a single point of rotation and having the geometrical centre of said reservoir coincident with said point of rotation; an essentially spherical member immersed in said fluid in said container, said spherical member being affixed to said stationary frame and having the geometrical centre of said spherical member coincident with said point of rotation of said pick-up arm and said reservoir thus providing equal coefficient of viscous friction when said pick-up arm rotates in the vertical and horizontal planes by virtue of shearing forces produced in said fluid between the outside surface of said spherical member and the inside surface of said hollow container.
2. A viscously damped record-player tonearm as described in claim 1 in which said gimbal suspension system is so constructed as to also allow said pick-up arm, said counterweight and said reservoir to move, when forced, upwards in the vertical direction, thus having the top opening of said reservoir sealed by a cover attached to said stationary frame.
3. A viscously damped record-player tonearm as described in claim 1 in which said stationary frame is essentially a vertical cylinder com-prising top and bottom covers and in which said suspension system com-prises: two short horizontal shafts attached to either side of said reservoir, two vertical flexible cords each having a part wound around each of said shafts, the upper ends of said cords being attached to one end of a third vertical flexible cord via a first rigid U shaped member, the other end of said third cord being attached to the inside of said top cover of said stationary cylindrical frame, the lower ends of said cords being attached to one end of a fourth flexible cord via a second U-shaped rigid member, the other end of said fourth flexible cord being attached to the inside of said bottom cover of said stationary cylindrical frame.
4. A viscously damped record-player tonearm as described in claim 3 in which said fourth flexible cord of said suspension system is attached to the inside of said bottom cover of said stationary cylindrical frame via a spring element thus allowing said pick-up arm, said counterweight and said reservoir to move, when forced, upwards in the vertical direction and thus having the top opening of said reservoir sealed by a cover attached to the inside of said stationary cylindrical frame.
CA284,205A 1977-08-05 1977-08-05 Viscous damping arrangement for record player tone arms Expired CA1058093A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA284,205A CA1058093A (en) 1977-08-05 1977-08-05 Viscous damping arrangement for record player tone arms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA284,205A CA1058093A (en) 1977-08-05 1977-08-05 Viscous damping arrangement for record player tone arms

Publications (1)

Publication Number Publication Date
CA1058093A true CA1058093A (en) 1979-07-10

Family

ID=4109286

Family Applications (1)

Application Number Title Priority Date Filing Date
CA284,205A Expired CA1058093A (en) 1977-08-05 1977-08-05 Viscous damping arrangement for record player tone arms

Country Status (1)

Country Link
CA (1) CA1058093A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2442486A1 (en) * 1978-11-23 1980-06-20 Sumachev Jury READING ARMS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2442486A1 (en) * 1978-11-23 1980-06-20 Sumachev Jury READING ARMS

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