(under the class definition) Devices which are provided with an envelope and which have means for replacing a defective electrode, or which the envelope and parts of the device made so the device can be readily disassembled to repair or
replace a part of the device.
(1) Note. Included in this subclass are devices provided with glass or other envelopes which are made so that the envelope can be readily opened or an opening made therein so that a new electrode can be inserted in the device. Also included are devices which have an electrode in the envelope not mounted on its supports or in position for use and which include means so that the electrode can be brought into position on the supports to replace a defective electrode. The defective electrode is usually removed from contact with its lead wires or supporting means and a new electrode substituted for the defective electrode, the defective electrode being stored within the device or entirely removed from the device. Where the device has a plurality of electrodes which are provided with individual lead wires or supporting means, one electrode remaining inactive while another is active, means being provided to change the connections to the terminals of the electrodes so that the inactive electrode may be used if it is so desired, see subclass 236 of this class.
SEE OR SEARCH THIS CLASS, SUBCLASS:
118+, for spark plugs which are demountable see subclass 119 where the spark plug is provided with sealing off means so that a part (e.g., the core) can be removed and repaired without stopping the ending, subclass 121 where the repair is made by reversing the position of a part (e.g., of the insulator), subclass 122 where the spark plug has a removable electrode on the shell, and subclasses 144+ for spark plugs with particular joint structure permitting disassembly of the plug.
236, where the device includes a plurality of electrodes and which are provided with means so that one electrode can be used to the exclusion of another until the first electrode fails and has means for substituting the second electrode therefor. See (1) Note above.
314, for devices under the class definition which are especially designed to be nonrepairable. SEE OR SEARCH CLASS
220, Receptacles,
2.1+, for envelopes, per se, for lamps and discharge devices.
314, Electric Lamp and Discharge Devices: Consumable Electrodes,
1+, for discharge devices of the consumable electrode type (e.g., arc lamps and similar devices provided with means for feeding the electrodes together) which have means for replacing and electrode with another when the first electrode
is consumed or fails to operate properly.
445, Electric Lamp or Space Discharge Component or Device Manufacturing,
2, for methods for repairing electric lamps and discharge devices and subclass 61 for the corresponding apparatus.
