Special receptacle or package – For holding a machine readable recording medium – For holding a grooved phonograph disc
Patent
1980-01-11
1982-10-26
Dixson, Jr., William T.
Special receptacle or package
For holding a machine readable recording medium
For holding a grooved phonograph disc
206303, 150 3, 24204, 229 68R, B65D 8557, B65D 2720, A44B 1700, A44B 1914
Patent
active
043557180
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to aids provided to keep grammophone record free of dust. By playing grammophone records the dust collected on the record causes considerable trouble and disturbances. Modern records of plastics material are charged with static electricity when played and handled, and because thereof they will attract dust. If the dust is not removed, the quality of the sound will be very bad as a result of particles of greater size causing clicks and the finest dust in the grooves of the record produces a distorsion of the sound when the record is played.
More exactly the invention refer to a sleeve for a grammophone record, which reduce the electric charge of the record and thus also its tendency to collect dust.
BACKGROUND ART
A great many auxialiary means have been created in order to remove the dust from the grammophone record before it is played. Thus clothes and brushes exist as well as brushes and pads which are dragging on the record during the playing of the same in order to collect the dust ahead of the stylus. However, these auxiliary means complicate the playing and have but a limited effect with respect to the removal of the finest dust particles from the groove of the record where they are fixed by the electrostatic forces.
However, also methods provided to remove the electrostatic charge exist by means of which the tendency of the record to collect dust is reduced. There are for example charging devices for the charging of the record with a charge opposite to the natural charge of the record so that the dust particles shall be repelled. Such a device is however complicated and will be expensive. The recharging operation also means a special manuvering. An aid in a common use is the diposing of a conducting plate on the turntable, usually called "carbon-plate" as such a plate usually is made of carbon rubber. The intension behind this plate is that the played side of the record will be grounded when this side is turned downwards against the turntable so that the electrostatical charge is removed. However, said plate has a very restricted effect as the grounding of the same usually is very unsufficient and also as a result of that the side of the record which is played latest not will be discharged if this side not is turned down against the carbon-plate by means of a certain operation in order to obtain a discharge. Usually the record is removed from the turntable after that the last side is played which results in that only the one side will be discharged.
The cover grammophone records usually are wrapped in comprises in general an inner sleeve of thin soft paper and together with this sleeve an outer sleeve of stiff cardboard. When a record is to be played it thus first has to be removed from the outer sleeve together with the inner sleeve and subsequently be taken out from the inner sleeve and be placed on the turntable of the recordplayer. As is well known a grammophone record with its fine engraving is easily damaged by scratches and must not be touched with the hands, as grease will then be deposited on the surface. Dust will subsequently be accumulated in the grease and will unfavourably affect the quality of the sound, when the record is played.
When the record is taken out from the inner sleeve, which has the form of a flat bag open at one end, the record thus must be handled in a very uncomfortable manner. The only possible way to take out the record without touching the engraving with the fingers is to introduce the hand into the sleeve without touching the record and place the four fingers against the label and the thumb against the very edge whereafter the record can be taken out while balancing it on the fingertips. After removal of the record sleeve the record has to be taken with both hands by pressing against the peripherical edge on diametrically opposed sides and with this hold deposit the record on the turntable. When putting down the record into the sleeve the operation takes place in inverted order; thus after grasping the record with th
REFERENCES:
patent: 3062371 (1962-11-01), Patience
patent: 3127089 (1964-03-01), Freeman
patent: 3325084 (1967-06-01), Ausnit
patent: 3462068 (1969-08-01), Suominen
patent: 3557413 (1971-01-01), Engle
patent: 4200189 (1980-04-01), Hagelberg
Bengt Petersson New Products Investment AB
Dixson, Jr. William T.
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