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THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH (making helical grooves by turning B23B 5/48, by milling B23C 3/32, by forging, pressing, or hammering B21K 1/56, by grinding B24B 19/02; arrangements for copying or controlling B23Q; thread-forming by corrugating tubes B21D 15/04, by rolling B21H 3/02)
Definition statement
This subclass/group covers:

Thread cutting by chip removal.

Production of threads with no removal of chips by means of tools similar in form and manner of use to thread cutting tools.

Working of screws, bolt heads and nuts in conjunction with thread cutting.

For further details of the interpretation of these terms, please refer to the notes under the relevant main group heading.

References relevant to classification in this subclass
This subclass/group does not cover:
Thread forming by corrugating tubes
Making threaded elements by forging/hammering
Making nuts by forging or hammering
Making screwthreads by rolling
Turning helical grooves
Turning tools for threading
Milling helical grooves
Making gears (inc wormwheels)
Making milling cutters for threading
Making threading tools
Multi stage processes involving threading and also other operations classed in B23B, B23C, B23D, B23F, making particular items
Details of machine tools and accessories not related to the operation being performed including:
- evacuation of swarf,
- guarding & protective coverings
- conveying workpiece into and from machine
- tool changing
- measuring or sensing
Adaptive control and/or computer controls for turning, boring or drilling processes
Grinding helicoidal grooves
Fasteners per se
Special rules of classification within this subclass

Classification in this subclass is generally according to a literal interpretation of the group and subgroup headings by a reader with a background in, and familiar with, metal cutting processes.

Indexing Codes from the 200 series (i.e ICO codes from the following groups: B23G 2200/00 to B23G 2200/50, B23G 2210/00 to B23G 2210/48, B23G 2225/00 to B23G 2225/60 and B23G 2240/00 to B23G 2240/60) should be added to documents at every possible opportunity for deep indexing.

A mirror image code scheme (i.e. B23G 1/00 to B23G 11/00) has recently been created for additional information. However, this scheme should NOT be used for classification of new documents.

At the end of each section of this document drawings have been provided, which give examples of the items classified in the most widely used subgroups. The example drawings have each been taken from a document classified within the subgroup, for which the example is provided.

Thread cutting; Automatic machines specially designed therefor
Definition statement
This subclass/group covers:

The cutting of threads and automatic machines specially designed therefor. A thread is to be understood as "a helical groove in a cylindrical hole" or a "helical ridge on a cylindrical bar, rod or shank". The term "cutting" should be understood as being by means of the removal of material, especially in the form of chips.

Illustrative example of subject matter classified in this group.

Notes:

None of the drawings is original and no copyright is claimed.

The majority of the drawings are each taken from a document classified in the group or subgroup, to which the example refers.

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B23G 1/16 Thread cutting by tapping

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B23G 1/185 Machine for tapping nuts with one working spindle (see also B23G 9/00)

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B23G 1/22 and B23G 1/24 Pipe threading machine

(for accessories see B23G 1/52)

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B23G 1/262 Tap wrench

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Special rules of classification within this subclass/group

Classification within this group is according to literal interpretation of the titles of the sub-groups.

Arrangements or accessories for enabling machine tools not specially designed only for thread cutting to be used for this purpose, e.g. arrangements for reversing the working spindle
Definition statement
This subclass/group covers:

Arrangements or accessories for enabling machine tools not specially designed only for thread cutting to be used for this purpose, e.g. arrangements for reversing the working spindle.

Illustrative example of subject matter classified in this group.

Notes:

The drawing is not original and no copyright is claimed. The drawing is taken from a document classified in the subgroup B23G 3/005, to which the example refers, and which is the only subgroup within B23G 3/00, within which documents are regularly classifie since the advent of CNC control.

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B23G 3/005 device to allow threading on a press

References relevant to classification in this group
This subclass/group does not cover:
Tool holders suitable for tapping tools that allow for expansion or contraction, as commonly used in the threading process, either with or without an overload clutch.
Thread-cutting tools; Die-heads
Definition statement
This subclass/group covers:

Thread-cutting tools and die-heads. The thread cutting tools of this group are the parts of the thread cutting arrangement containing the cutting edges. This can be in the form of a tool removable from a machine, manually operable, or both. Example: a tap characterised by the features of the tap itself would be classed in B23G 5/06. A machine using such a tap with special features of the machine or the process of tapping is classed in B23G 1/16. A tap wrench for manually using the tap is classed in B23G 1/261.

Illustrative example of subject matter classified in this group.

Notes:

None of the drawings is original and no copyright is claimed.

The majority of the drawings are each taken from a document classified in the group or subgroup, to which the example refers.

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B23G 5/064 & B23G 5/068 Tap with weakened shank and means to remove broken tap

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B23G 5/043 threading die with guide (5)

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B23G 5/066 Tap with stop

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Special rules of classification within this subclass/group

Classification within this group is per literal interpretation of the subgroup headings by a reader skilled in the art of metal cutting.

Forming thread by means of tools similar both in form and in manner of use to thread-cutting tools, but without removing any material (features of machines or devices not specially adapted to the particular mode of forming the thread B23G 1/00)
Definition statement
This subclass/group covers:

Forming threads by means of tools similar both in form and in manner of use to thread-cutting tools, but without removing any material.

The term "similar in form and in manner of use to thread cutting tools" of B23G 7/00 should be strictly interpreted. The forming tool being used should bear a very close resemblance to known cutting tools. Examples of such tools are forming taps (roll taps i.e. a tool similar to a cutting tap, rotated on its own axis and fed linearly with feed per revolution equal to thread pitch), and forming tools resembling milling cutters rotated on their own axes and used with a helical feed in which the pitch of the helix corresponds to that of the thread being produced. Although these are the most common examples, the use of thread-forming dies, similar to in form to thread cutting dies or indeed any tool falling under the term, "similar both in form and in manner of use" that isn't classed elsewhere in ECLA can be classed here.

Illustrative example of subject matter classified in this group.

Notes:

None of the drawings is original and no copyright is claimed.

The majority of the drawings are each taken from a document classified in the group or subgroup, to which the example refers.

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B23G 7/02 Roll tap

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B23G 7/02 Tool for forming a thread by a procedure similar to milling

References relevant to classification in this subclass
This subclass/group does not cover:
Thread forming by corrugating tubes
Making threaded elements by forging/hammering
Making nuts by forging or hammering
Making screwthreads by rolling

As the tools used in these processes are not similar in form and manner of use to a thread-cutting tool.

Special rules of classification within this subclass/group

Classification is per a literal interpretation of the group/subgroup heading by a person skilled in the art of metal cutting.

Working screws, bolt heads, or nuts in conjunction with thread cutting, e.g. slotting screw heads or shanks, removing burrs from screw heads or shanks; Finishing, e.g. polishing, any screw-thread
Definition statement
This subclass/group covers:

Working screws, bolt heads, or nuts in conjunction with thread cutting, e.g. slotting screw heads or shanks, removing burrs from screw heads or shanks; Finishing, e.g. polishing, any screw-thread.

The term "in conjunction with thread cutting" in the title of group B23G 9/00 should be interpreted in a very strict and limited manner. Documents should only be classified in B23G 9/00 if the content refers to the mechanical working of the screw, bolt or nut. The working of screws, bolt heads or nuts MUST be in conjunction with the cutting of the thread. For example the coating of screw threads should be classified either according to the fastener per se or according to the process being used.

Illustrative example of subject matter classified in this group.

Notes:

None of the drawings is original and no copyright is claimed.

The majority of the drawings are each taken from a document classified in the group or subgroup, to which the example refers.

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Special rules of classification within this subclass/group

Classification is per a literal interpretation of the group/subgroups headings by a person skilled in the art of metal cutting.

Feeding or discharging mechanisms combined with, or arranged in, or specially adapted for use in connection with, thread-cutting machines (for machines tools in general B23Q)
Definition statement
This subclass/group covers:

Feeding or discharging mechanisms combined with, or arranged in, or specially adapted for use in connection with, thread-cutting machines (for machines tools in general B23Q)

B23G 11/00 refers to feeding or discharging mechanisms in so far as they are specifically destined for thread cutting machines. B23Q 7/00 is used for feeding or discharging mechanisms in general.

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Last Modified: 10/11/2013