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US 3,993,315 AGranted
Automatic phonographs
AssigneeBang & Olufsen A/S
InventorsSvend Hansen, Nicolai Krebs Sorensen
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AssigneeBang & Olufsen A/S
InventorsSvend Hansen, Nicolai Krebs Sorensen
Estimating the term…
An automatic phonograph comprising a carrier chassis for a turn table and a pick-up arm, said carrier chassis being supported resiliently by a main chassis, a turn table driving motor, means for moving the tone arm horizontally from an outer inoperative position of rest to a position above the inlet of the sound groove of a record placed on the turn table, means for lowering and raising the tone arm to and from engagement with the record, means for selecting or detecting the tone arm position in which the tone arm is lowerable into engagement with the inlet sound groove of the record, according to the size of the record, stop means responsive to the tone arm reaching an inner position in which it has finished playing of the record and operable to cause the tone arm to be raised and moved outwardly to its inoperative position and to cause the driving motor to be switched off and switch means for energizing the driving motor and the tone arm moving means, the driving means for moving the tone arm both horizontally and vertically being controlled by switch means actuated in response to selection and/or detection of the appropriate conditions for the said tone arm moving means to be actuated, all in such a manner that there is no mechanical driving connection between the turn table and the tone arm moving means and that at least the major manual controls are constituted by switch means located on the main chassis and being without mechanical operational connection with the operation performing means on the carrier chassis.
A phonograph comprising in combination:
In a phonograph comprising a main chassis and a carrier chassis with said carrier chassis supporting a phonograph turntable and being suspended by spring means to the main chassis, the improvement comprising said spring means including a plurality of leaf springs secured at one end to one of said main chassis and carrier chassis, each of said leaf springs projecting substantially horizontally and having a free end, and a plurality of pendulum members, each pendulum member having one end connected to a respective free end of one of said leaf springs and the other end connected to the other of said main and carrier chassis.
A phonograph or similiar apparatus comprising a main chassis and a carrier chassis, said carrier chassis being suspended in spring means in the main chassis, said spring means comprising a plurality of leaf springs secured at one end to one of said main chassis and carrier chassis, each of said leaf springs projecting substantially horizontally and having a free end, and a plurality of pendulum members, each pendulum member having one end connected to a respective free end of one of said leaf srings and the other end connected to the other of said main and carrier chassis, and wherein a plurality of mechanical clamping means are provided for temporarily clamping the carrier chassis to the main chassis, the clamping means being manually actuable from outside the main chassis and each clamping means comprising two clamping members movable towards and away from each other so that when actuated for clamping the two clamping members engage opposed surface portions of the carrier chassis approximately at the levels normally occupied by the surface portions when the carrier chassis is resiliently suspended in the non-clamped condition.
An automatic phonograph having a carrier chassis, a turn table and a tone arm mounted on said carrier chassis, control means operable to raise and lower the tone arm and to move the tone arm horizontally in its raised position from an initial position of rest into an appropriate ready-to-start position above the inlet groove area of a record resting on said turn table, detector means associated with the tone arm so as to participate in the horizontal movement thereof and being responsive to passage across the outer edge of the record for producing a first control signal in response to the passage, signalling means for producing a second control signal in response to the tone arm reaching a position corresponding to the ready-to-start position above the inlet groove of each of at least two different size records, said control means being operatively connected with both said detector means and said signalling means for stopping the horizontal movement of the tone arm and the lowering of the tone arm in response to simultaneous reception of both said first and second control signals.
A phonograph according to claim 43, wherein said detector means produce said first control signal in response to movement of said detector means across the record edge from outside the record edge towards a central portion of the record.
Dependencies are inferred from the claim text.