US3788648A - Locking device for tone arms - Google Patents

Locking device for tone arms Download PDF

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Publication number
US3788648A
US3788648A US00208864A US3788648DA US3788648A US 3788648 A US3788648 A US 3788648A US 00208864 A US00208864 A US 00208864A US 3788648D A US3788648D A US 3788648DA US 3788648 A US3788648 A US 3788648A
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US
United States
Prior art keywords
arm
tone arm
tone
turntable
rest
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 - Lifetime
Application number
US00208864A
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English (en)
Inventor
K Kawai
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Application granted granted Critical
Publication of US3788648A publication Critical patent/US3788648A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/02—Arrangements of heads
    • G11B3/10—Arranging, supporting, or driving of heads or of transducers relatively to record carriers

Definitions

  • ABSTRACT A locking device for a tone arm comprising a tone [3()] Foreign Application Priority Data arm lifter and a tone arm rest.
  • the arm lifter is ar- Dec. 17, 1970 Japan 45/126317 ranged 80 that the outer end Portion of the lift Plate is formed with a curved hook-like portion, the outer end 52 US. Cl 274/23 B of which is bent inwardly- The Seating plate of the arm 51 1111. c1.
  • G1 lb 3/10 rest is Provided with a rising eurved Portion, at least in 58 Field of Search 274/23 B, 23 R its inner Side p
  • the hook-like portion of the arm lifter and the rising portion of the arm rest form an ap- 5 References Cited erture having a restricted opening between the outer end of the hook-like portion and the tOp Of the rising portion, wherein the tone arm is captively located and 3,271,035 Johnston 274/23 R clamped when the arm is oubotluse' FOREIGN PATENTS 0R APPLICATIONS 559,312 6/1958 Canada 274 23 R 2 Clams 12 Draw PATENTEDJANEQIW 3,788,648
  • FIG. 3 PRIOR ART PRIO A T PATENTEUJANZQIBH 3. 788,648
  • the present invention is directed to a locking device for a tone arm, and more particularly to a simple and improved arrangement for locking a pick-up tone arm in its out-of-use position to prevent damage due to accidental displacement.
  • the tone arm I is, as shown in FIGS. 1-3, rested only on a tone arm rest 3 by means of a lifting device 2 or socalled arm lifter or arm elevator, without locking or damping, so that the arm 1 is in unstable condition and in danger of unexpected falling off the arm rest 3 and subject to damage.
  • a lifting device 2 or socalled arm lifter or arm elevator without locking or damping, so that the arm 1 is in unstable condition and in danger of unexpected falling off the arm rest 3 and subject to damage.
  • These types of locking devices are, however, not suitable to an automatic record changer and are liable to remain inadvertently unlocked.
  • the present invention has an object to provide a simple and effective locking device without any additional parts, wherein the tone arm may be locked or unlocked on the arm rest only by manipulating the arm lifter without need of any other particular operation for locking the same.
  • a tone arm lifter and a tone arm rest there is provided a tone arm lifter and a tone arm rest.
  • the arm lifter has a lifting plate and the outer end portion thereof is formed with a curved hook-like portion, the outer end of which is bent inwardly.
  • the arm rest has a seating plate,which is provided with a rising curved portion at least within the inner side portion thereof.
  • the rising portion of the resting plate is complementary to the hook-like portion of the lifting plate of the arm lifter to form an aperture having a restricted opening between the top of the seating plate rising portion and the outer end portion of the hook-like portion, wherein the tone arm is captively located and clamped for preventing the arm from disengaging from rest position when the arm is out-of-use.
  • FIG. I is the top view of the tone arm resting on an arm rest of a conventional record player unit.
  • FIG. 2 is a side view of the tone arm of FIG. 1.
  • FIG. 3 is the cross sectional view substantially on the line A-A of FIG. 2, in which the rear portion of the arm and the arm supporting device are omitted.
  • FIG. 4 is the front elevational view of a conventional arm rest having a locking device, and the dotted line illustrates the arm locked by the locking device.
  • FIG. 5 is the top view of the tone arm locked by the locking device of the present invention.
  • FIG. 6 is the side view of the tone arm of FIG. 5.
  • FIG. 7 and FIG. 8 are the cross sectional views suly stantially on the lines BB and C-C respectively of FIG. 6, in which the rear portions of the arm and the arm supporting device are omitted.
  • FIGS. 9, l0, l1 and 12 are front views, respectively, illustrating the relation between the tone arm, the arm lifter and the arm rest of the embodiment in various operating conditions.
  • FIGS. 5 12 there are shown a tone arm 1, a vertically movable arm lifter 2, and a fixed arm rest 3.
  • the outer end portion (further portion from the turn table T) of the lifting plate 21 of the arm lifter 2 is, as best seen in FIG. 8, formed with a curved hook-like portion, the outer end a of which bends inwardly so as to arrest the upward movement of the tone arm 1.
  • the seating plate 3 of the arm rest 3 is, as best seen in FIG. 7, provided with a curved rising portion at least at its inner side (closer portion to the turn table T).
  • the rising portion of the seating plate 3' cooperates with the curved hook-like portion of the lifting plate 2 to form an aperture having an opening C between the top b of the rising portion and the outer end a of the hook-like portion so that the tone arm 1 may be captively located in the aperture, that is, since the dimension C is less than the diameter of the tone arm 1, the arm can not be withdrawn from the opening.
  • the tone arm 1 is, as shown in FIG. 10, elevated vertically to up position, by manipulating the arm lifter 2, and then, as shown in FIG. 11, the arm 1 is turned in the clockwise direction to bring it into a record-playing position along the lifting plate 2'.
  • the arm lifter 2 is manipulated, as shown in FIG. 12, for lowering the tone arm 1 so that the stylus of the pick-up (not shown) mounted thereto may contact a record (not shown) at any selected position.
  • the tone arm 1 is elevated again by operating the arm lifter 2, and turned outwardly along the lifting plate 2' until the arm 1 enters into the booklike portion. Then, the tone arm is lowered onto the arm rest 3 and left intact in the hook-like portion. This state is illustrated in FIG. 9, and thus, the tone arm 1 is locked.
  • the present invention provides a novel and improved arrangement of locking device for a tone arm, in which the tone arm may be assured of being locked at its rest position and unlocked at the beginning of playing only by usual manipulation of the tone arm and the arm lifter without any special operation for locking or unlocking.
  • the tone arm may remain unlocked inadvertently, and damaged by accidental displacement.
  • this arrangement need not require any additional parts, so that the manufacturing cost is inexpensive.
  • a locking device for a tone arm for a record player or the like comprising:
  • a turntable mounted for rotation about a vertical axis
  • tone arm mounted adjacent said turntable and pivotable about a vertical axis and a horizontal axis from a position of rest adjacent the turntable to a position of play on the turntable
  • a vertically movable arm lifter having a lifting plate underlying said tone arm for contact therewith
  • the outer end portion of said lifting plate being formed with a curved hook-like portion, the end of which is remote from said turntable being bent inwardly,
  • the seating plate of said arm rest being provided with a rising curved portion, at least at its inner side relative to said turntable, whereby, when said tone arm is retracted from a playing position, the tone arm comes to rest on said arm lifter in an uppermost position with the tone arm resting within said hook-like portion, whereupon said arm lifter is lowered to seat said tone arm on said arm rest, the hook-like portion of said lifting plate and the rising portion of said seating plate then forming an aperture having a restricted opening between the outer end of said hook-like portion and the top of said seating plate rising portion with the dimension of the opening being less than the diameter of the tone arm.

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  • Supporting Of Heads In Record-Carrier Devices (AREA)
US00208864A 1970-12-17 1971-12-16 Locking device for tone arms Expired - Lifetime US3788648A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1970126317U JPS4934805Y1 (enrdf_load_stackoverflow) 1970-12-17 1970-12-17

Publications (1)

Publication Number Publication Date
US3788648A true US3788648A (en) 1974-01-29

Family

ID=33279963

Family Applications (1)

Application Number Title Priority Date Filing Date
US00208864A Expired - Lifetime US3788648A (en) 1970-12-17 1971-12-16 Locking device for tone arms

Country Status (2)

Country Link
US (1) US3788648A (enrdf_load_stackoverflow)
JP (1) JPS4934805Y1 (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4899328A (en) * 1986-06-13 1990-02-06 Kabushiki Kaisha Toshiba Data reproducing apparatus and method for locking a reproducing head
US5590095A (en) * 1991-08-30 1996-12-31 Canon Kabushiki Kaisha Magneto-optical disk apparatus with floating type magnetic head and a device for limiting an amount of deflection of a resilient member supporting the magnetic head
US5625607A (en) * 1992-02-13 1997-04-29 Canon Kabushiki Kaisha Magneto-optical disk apparatus including two magnetic field applying devices, one of which has a substantial ring-shaped core member with a gap in a portion thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA559312A (en) * 1958-06-24 Wennerbo Erik Phonograph tone arm locking device
US3271035A (en) * 1964-01-13 1966-09-06 Philco Corp Phonograph apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA559312A (en) * 1958-06-24 Wennerbo Erik Phonograph tone arm locking device
US3271035A (en) * 1964-01-13 1966-09-06 Philco Corp Phonograph apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4899328A (en) * 1986-06-13 1990-02-06 Kabushiki Kaisha Toshiba Data reproducing apparatus and method for locking a reproducing head
US5590095A (en) * 1991-08-30 1996-12-31 Canon Kabushiki Kaisha Magneto-optical disk apparatus with floating type magnetic head and a device for limiting an amount of deflection of a resilient member supporting the magnetic head
US5625607A (en) * 1992-02-13 1997-04-29 Canon Kabushiki Kaisha Magneto-optical disk apparatus including two magnetic field applying devices, one of which has a substantial ring-shaped core member with a gap in a portion thereof

Also Published As

Publication number Publication date
JPS4934805Y1 (enrdf_load_stackoverflow) 1974-09-21

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