Notes[t] G01 - G12: INSTRUMENTS
Notes[n] G05:
  • This class covers methods, systems, and apparatus for controlling, in general.
  • In this class, the following terms or expressions are used with the meanings indicated:
    • "controlling" means influencing a variable in any way, e.g. changing its direction or its value (including changing it to or from zero), maintaining it constant, limiting its range of variation;
    • "regulation" means maintaining a variable automatically at a desired value or within a desired range of values. The desired value or range may be fixed, or manually varied, or may vary with time according to a predetermined "programme" or according to variation of another variable. Regulation is a form of control;
    • "automatic control" is often used in the art as a synonym for "regulation".
  • Attention is drawn to the Notes following the title of section G, especially as regards the definition of the term "variable".
G05B CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (fluid-pressure actuators or systems acting by means of fluids in general F15B; valves per se F16K; characterised by mechanical features only G05G; sensitive elements, see the appropriate subclasses, e.g. G12B, subclasses of G01, H01; correcting units, see the appropriate subclasses, e.g. H02K).
Notes[n] G05B:
  • This subclass covers features of control systems or elements for regulating specific variables, which are clearly more generally applicable.
  • This subclass does not cover :
    • systems for controlling or regulating non-electric variables in general, which are covered by subclass G05D;
    • systems for regulating electric or magnetic variables in general, which are covered by subclass G05F;
    • systems specially adapted for the control of particular machines or apparatus provided for in a single other subclass, which are classified in the relevant subclass for such machines or apparatus, provided that there is specific provision for control or regulation relevant to the special adaptation (see Note (5), below). Otherwise, classification is made in the most appropriate place in this subclass.
  • In this subclass, the following terms or expressions are used with the meanings indicated:
    • "automatic controller" means a system, circuit, or device in which a signal from the detecting element is compared with a signal representing the desired value and which operates in such a way as to reduce the deviation. The automatic controller generally does not include the sensitive element, i.e. that element which measures the value of the condition to be corrected, or the correcting element, i.e. that element which adjusts the condition to be corrected;
    • "electric" includes "electromechanical", "electrohydraulic" or "electropneumatic".
  • In this subclass, details of specific control systems are classified in the group relevant to the system, if not otherwise provided for.
  • This Note lists places in the IPC where there is specific provision of the kind referred to in Note (2)(c), above; where such provision is at a general level, the places are listed under the heading "General references"; where the provision is related to programme control, the places are listed under the heading "Places related to group G05B 19/00 ".
G05D SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES (for continuous casting of metals B22D 11/16; valves per se F16K; sensing non-electric variables, see the relevant subclasses of G01; for regulating electric or magnetic variables G05F).
Notes[n] G05D:
G05F SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES (regulating the timing or recurrence frequency of pulses in radar or radio navigation systems G01S; regulation of current or voltage, specially adapted for use in electronic time-pieces G04G 19/02; closed-loop systems for regulating non-electric variables by electric means G05D; regulating power supply of digital computers G06F 1/26; for obtaining desired operating characteristics of electromagnets with armatures H01F 7/18; regulating electric power distribution networks H02J; regulating the charging of batteries H02J 7/00; regulating of the output of static converters, e.g. switching regulators, H02M; regulation of the output of electric generators H02N, H02P 9/00; controlling transformers, reactors or choke coils H02P 13/00; regulating frequency response, gain, maximum output, amplitude or bandwidth of amplifiers H03G; regulating tuning of resonant circuits H03J; controlling generators of electronic oscillations or pulses H03L; regulating characteristics of transmission lines H04B; controlling electric light sources H05B 37/02, H05B 39/04, H05B 41/36; electric control of X-ray apparatus H05G 1/30).
Notes[n] G05F:
  • This subclass covers :
    • systems only;
    • use of hydraulic, pneumatic, mechanical, and electrical motors for varying electric characteristics of devices which restore the quantity regulated;
    • the combination of static converters and current or voltage regulators, if the essential characteristic resides in the combination.  
  • This subclass does not cover elements per se , which are covered by the relevant subclasses.
G05G CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY ("Bowden" or like mechanisms F16C 1/10; gearings or mechanisms not peculiar to this purpose F16H; speed changing or reversing mechanisms for gearings conveying rotary motion F16H 59/00 - F16H 63/00).
Notes[n] G05G:
  • This subclass covers :
    • members of general applicability for mechanical control;
    • mechanical systems for moving members to one or more definite settings.
  • Systems peculiar to the control of particular machines or apparatus provided for in a single other class are classified in the relevant class for such machines or apparatus, for example:
    • A61G 13/02 Controls for adjusting operating tables
    • A61G 15/02 Controls for adjusting operating chairs
    • A63F 13/02 Accessories for games using an electronically generated display
    • B25J Manipulators, e.g. controls therefor
    • B60K 26/00 Arrangement or mounting of propulsion-unit control devices in vehicles
    • B60T 7/00 Vehicle brake-action initiating means
    • B62D 33/073 Adaptations of control devices for movable vehicle cabs
    • B62K 21/00 Cycle-steering devices
    • B62K 23/00 Rider-operated controls specially adapted for cycles
    • B62L 3/00 Brake-actuating mechanisms specially adapted for cycles
    • B63H 25/02 Marine steering initiating means
    • B66B 1/00 Controls for elevators
    • B66C 13/18 Control systems or devices for cranes
    • B66C 13/56 Arrangements of handles or pedals for crane operation
    • E02F 9/20 Control devices for dredging or soil shifting machines
    • F16C 3/28 Adjustable cranks or eccentrics
    • F16D 43/00 Automatic clutches
    • F16K 31/00, F16K 33/00 Controls for valves
    • F16P 3/00 Safety devices acting in conjunction with the control or operation of a machine
    • F16P 7/02 Stopping machines on occurrence of dangerous conditions therein
    • G02B 21/32 Micromanipulators structurally combined with microscopes
    • G04B 1/00 - G04B 18/00 Driving mechanisms in clocks or watches
    • G06C Digital computers in which all the computation is effected mechanically
    • G06F 3/01 Manual computer input arrangements
    • G06K 11/00 Converting a pattern of mechanical parameters into electric signals
    • G21C 7/08 Displacement of solid control elements in nuclear reactors
    • H01H Mechanisms for operating switch contacts
    • H03J 1/00 Mechanical control of resonant circuits.