Hinge for opening and closing a dust cover

Details Hinge for opening and closing a dust cover Hinge for opening and closing a dust cover

1981-08-10

1984-01-10

Rosenbaum, Mark

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Hinge

With diverse art portion or attachment

16289, 16292, 16296, 16297, 16321, 16332, 16352, 369 751, E05F 110

Patent

active

044246064

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION



BACKGROUND OF THE INVENTION

This invention relates to a hinge for opening and closing the dust cover of record players.


BRIEF DESCRIPTION OF THE PRIOR ART

This kind of dust cover hinge generally has a means for offsetting or balancing the weight of the dust cover so as to prevent the dust cover from closing abruptly and causing the stylus to jump out of the record groove, and to facilitate the operation of setting the record onto the turntable as well as the lead-in operation of the tone arm.
What is generally called a rear hinge, mounted between the rear portion of the record player cabinet and the rear portion of the dust cover, has a disadvantage that being exposed at the back of the record player, the rear hinge mars the beauty of the record player as furniture. The rear hinge also has another drawback that when the dust cover is opened the rear portion of the dust cover projects further from the back of the cabinet, thus requiring an extra space when installing the record player to allow for that projection.
Another commonly used hinge, a so-called side hinge, is fitted between the rear side portion of the record player cabinet and the rear side portion of the dust cover. With the side hinge, the pivoting axis of the dust cover is located a certain distance in front of the rotating axis for the rear hinge. Thus, to this extent, the rear portion of the dust cover can be prevented from projecting backward. But it has a disadvantage that the rear lower end of the dust cover must either be split in two or removed, so that dust is likely to get in through this portion.
It is known that the curve of torque required to open or close the dust cover corresponds to a sine curve as indicated by the solid line in FIG. 6. It is therefore desirable that the device for opening or closing the dust cover have the torque characteristic as shown by the dotted curve of FIG. 6 in order for the device to perform the functions described above.


SUMMARY OF INVENTION

The object of this invention is to provide a dust cover hinge for the record player which has the necessary torque characteristic and various functions required of this kind of dust cover opening-closing device and which overcomes various drawbacks of the aforementioned conventional devices.
To achieve this objective, this invetion comprises: a cabinet; a dust cover; a slider inserted in the rear end portion of the cabinet on each side in such a manner that it can be moved vertically; a spring urgint the slider upward; a support member removably attached to the dust cover and rotatably fitted to the cabinet by means of a hinge pin; and a follower provided to the support member which contacts the head portion of the slider.
With this construction, this invention can achieve the aforementioned object, as will be explained in the following, detailed description and the accompanying drawings, in which:


BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view of the record player using the hinge of this invention for opening and closing the dust cover;
FIG. 2 is a horizontal cross-sectional view of the hinge;
FIG. 3 is a rear elevation of the same portion;
FIG. 4 is a side view of the vertical cross section of the same portion;
FIG. 5 is a vertical cross section of the same portion as viewed from the side with the dust curve opened;
FIG. 6 is a graph showing the torque corve of the dust cover and the ideal torque curve of the hinge for opening and closing the dust cover;
FIG. 7 is a partial cross section of another embodiment as viewed from the side;
FIG. 8 is a plan view of the same portion;
FIG. 9 is an explanatory diagram showing the relation between the cam plate and the support pin;
FIG. 10 is a graph showing the torque curve exhibited by the embodiment shown in FIGS. 7 through 9; and
FIG. 11 is an explanatory diagram showing still another embodiment.


BEST MODE FOR CARRYING OUT THE INVENTION

Now, we will explain in detail one embodiment of this invention referring to the accompanying drawings. In FIGS. 1 through 5, the dust cover hing

REFERENCES:
patent: 2743476 (1956-05-01), Turner
patent: 4356594 (1982-11-01), Grosemans

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