Source: {"pile_set_name": "USPTO Backgrounds"}

The invention concerns a device for securing a compact disk to an upright player, with a means of mounting the disk and a means of preventing it from dropping out.
Upright compact-disk players are generally inexpensive embodiments without costly disk accommodations or compartments. The disks are forced against a turntable and accordingly centered by means of a pressure-application lever in this simple and economical design. When the user disengages the aforesaid mechanism in order to remove the disk, it can readily slide off center and drop out unless carefully handled. One reason for this is that the disk does not stop instantaneously subject to a stop pulse when the lever is disengaged. A falling compact disk can not only be damaged but can cause injuries.
To reliably secure the compact disk to the turntable, the pressure-application mechanism is usually provided with a permanent magnet that functions in conjunction with a soft-iron turntable.