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CPC Definition - Subclass B27B

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Last Updated Version: 2025.01
B27B
SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR (saws specially adapted for pruning or debranching A01G 3/08; sawing apparatus specially adapted for felling trees A01G 23/091; features not restricted to a particular type of wood saw B23D, e.g. attaching saw blades B23D 51/00; machine tool frames, beds, pillars or like members, in general B23Q 1/01)
Definition statement

This place covers:

Saws for sawing wood:

- Wood saws characterised by the active element:

- Portable or hand saws for wood: B27B 9/00, B27B 21/00

- Active elements of wood saws: B27B 23/00, B27B 33/00

- Accessories for wood saws: B27B 25/00, B27B 31/00

- Sawing trunks or logs, saws specially adapted therefor: B27B 1/00, B27B 3/00, B27B 7/00, B27B 15/00

Relationships with other classification places

Other large areas covering sawing are B23D 45/00-B23D 65/00 (sawing in general, sawing metal) and B28D 1/02 (sawing stone). B23D is the main entry for sawing. Precedence is given to B23D. Features not restricted to a particular type of saw are classified in B23D. However, such features are classified in B27B if a more specific entry exists in B27B, for example:

References
Limiting references

This place does not cover:

Sawing in general (unless a more specific entry exists in B27B)

B23D 45/00 - B23D 65/04

Constructional features of particular parts per se of sawing machines or sawing devices

B23Q

Details or components, e.g. casings, bodies, of portable power-driven saws not particularly related to the operation performed

B25F 5/00

Safety guards or devices specially designed for wood saws

B27G 19/00

Sawing stone or stone-like materials

B28D 1/02

Accessories specially adapted for use with machines for sawing of gems, jewels, crystals

B28D 5/0058

Sawing gems, jewels, crystals with discs or wheels

B28D 5/022

Sawing gems, jewels, crystals with blades or wires

B28D 5/042, B28D 5/045

Accessories specially adapted for use with machines or devices for sawing stone

B28D 7/00

Informative references

Attention is drawn to the following places, which may be of interest for search:

Saws specially adapted for pruning or debranching

A01G 3/08

Sawing apparatus specially adapted for felling trees

A01G 23/091

Meat or bone saws

A22B 5/20

Surgical saws

A61B 17/14

Saws for dentistry

A61C 3/12

Grinders for cutting-off

B24B 27/06

Auxiliary devices facilitating proper operation of wood saws

B27G 19/00

Glossary of terms

In this place, the following terms or expressions are used with the meaning indicated:

Feeding work

moving a workpiece into engagement with a saw blade while sawing

Conveying or transporting work

moving a workpiece before, after or between sawing operations

Discharging work

moving a workpiece away from a saw blade after sawing

Methods for subdividing trunks or logs essentially involving sawing
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Saw benches with non-feedable circular saw blades for cross-cutting laterally fed workpieces

B27B 5/228

Cross-cutting reciprocating saws with power drive

B27B 11/00

Gang saw mills; Other sawing machines with reciprocating saw blades, specially designed for length sawing of trunks
Definition statement

This place covers:

Gang saw mills; Other sawing machines with reciprocating saw blades, specially designed for length sawing of trunks

Sawing machines working with circular {or cylindrical} saw blades (for length sawing of trunks B27B 7/00); Components or equipment therefor
References
Limiting references

This place does not cover:

Sawing machines working with circular saw blades for length sawing of trunks

B27B 7/00

Arrangements for adjusting the mutual distances of circular saw machines for lengthwise sawing of trunks

B27B 7/04

Circular saws combined with band or strap sawing machines specially designed for length cutting of trunks

B27B 15/06

Machines for cutting through a work-piece with a tool having a rotational vector which is parallel to the surfaces generated by cutting

B27C 1/007

Slotting or mortising machines

B27F 5/02

{with at least one brake member contacting saw blade portions}
Definition statement

This place covers:

Circular saws including one or more brake members that touch the saw blade, such as touching at the teeth of the saw blade as in the image below, or touching at one or more sides of the saw blade.

Illustrative example of subject matter classified in this place:

media56.png

Sawing machines working with circular saw blades, specially designed for length sawing of trunks
References
Limiting references

This place does not cover:

Equipment for adjusting the mutual distance of circular wood saws in general

B27B 5/34

Portable power-driven circular saws for manual operation (details or components, e.g. handles, casings, of portable power-driven tools not particularly related to the operation performed B25F 5/00)
References
Limiting references

This place does not cover:

Circular sawing machines for dividing plates in parts of determined size, e.g. panels

B27B 5/06

Details or components, e.g. casings, bodies, of portable power-driven saws not particularly related to the operation performed

B25F 5/00

Cross-cut reciprocating saws with power drive; Appurtenances therefor
Definition statement

This place covers:

Saws with straight reciprocating saw blades.

Band or strap sawing machines (for length cutting of trunks B27B 15/00); Components or equipment therefor
References
Limiting references

This place does not cover:

Band or strap sawing machines specially designed for length cutting of trunks

B27B 15/00

Devices for guiding strap saw blades in general

B23D 55/08

Devices for tensioning strap saw blades in general

B23D 55/10

{with at least one brake member contacting saw blade portions}
Definition statement

This place covers:

Band saws including one or more brake members that touch the band saw blade, such as touching at the teeth of the band saw blade, or touching at one or more sides of the band saw blade.

Illustrative example of subject matter classified in this place:

Note, in the figure below, a brake member 16 contacts the side of the sawing band 4.

media57.png

Band or strap sawing machines specially designed for length cutting of trunks
Definition statement

This place covers:

Band or strap sawing machines specially designed for length cutting of trunks

Chain saws; Equipment therefor {(slotting or mortising machines equipped with chain cutters B27F 5/06)}
References
Limiting references

This place does not cover:

Slotting or mortising machines equipped with chain cutters

B27F 5/06

{with adjustment by at least one cam}
Definition statement

This place covers:

Arrangements for stretching a chain saw including at least one cam, where the cam can be a rotational or linear cam, and where the cam can include an internal or external camming surface.

Illustrative example of subject matter classified in this place:

Note, in the figure below, a rotational cam (30) with an external camming surface.

media58.png

{with adjustment by at least one threaded screw}
Definition statement

This place covers:

Illustrative example of subject matter classified in this place:

Note, in the figure below, threaded screw 382 is driven to rotate via rotation of knob 400, and rotation of the threaded screw 382 moves elements 310 and 370 in the direction of arrow 3105 to move guide bar 200 to adjust chain tension.

media59.png

{with adjustment of a non-driven sprocket or pulley relative to the guide bar}
Definition statement

This place covers:

Illustrative example of subject matter classified in this place:

Note, in the figure below, where sprocket 16 is positionally adjusted relative to the guide bar 18, in order to tension the chain.

media60.png

Other reciprocating saws with power drive; Fret-saws
Definition statement

This place covers:

Saws with oscillating saw blades

B27B 19/006

Hand saws without power drive ({hand saws with oscillating saw blades,} B27B 19/14 takes precedence); Equipment for hand sawing, e.g. saw horses {(work benches B25H 1/00; saw guides B27B 11/02)}
References
Limiting references

This place does not cover:

Saw guides

B27B 11/02

Saws benches or saw bucks for chain saws

B27B 17/0041

Fret saws with hand drive

B27B 19/14

Work benches, horses in general

B25H 1/00

Other cutting of wood by non-rotary toothed tools; Tools therefor (cutting with hot wire B27M 1/06)
References
Limiting references

This place does not cover:

Cutting with hot wire

B27M 1/06

Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees ({B27B 29/00}, B27B 31/00 take precedence)
References
Limiting references

This place does not cover:

Gripping, clamping, or holding devices for the trunk or log in saw mills or sawing machines; travelling trunk or log carriages

B27B 29/00

Arrangements for conveying, loading, turning, adjusting, or discharging the log or timber, specially designed for saw mills or sawing machines

B27B 31/00

Guide fences or stops for timber in saw mills or sawing machines; Measuring equipment thereon (safety guards or devices specially designed for wood saws B27G 19/00; constructional features of measuring devices G01B)
References
Limiting references

This place does not cover:

Devices for mitring wood

B27G 5/00

Safety guards or devices specially designed for wood saws

B27G 19/00

Constructional features of measuring devices

G01B

Gripping, clamping or holding devices for the trunk or log in saw mills or sawing machines (safety guards or devices specially designed for wood saws B27G 19/00); Travelling trunk or log carriages {(for logs being held in a cantilever manner B27B 17/0075)}
References
Limiting references

This place does not cover:

Travelling trunk or log carriages for logs being held in a cantilever manner

B27B 17/0075

Safety guards or devices specially designed for wood saws

B27G 19/00

Informative references

Attention is drawn to the following places, which may be of interest for search:

Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts

B23D 47/00

Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends

B23D 51/00

Sawing machines or sawing devices working with strap saw blades, characterised only by constructional features of particular parts

B23D 55/00

Sawing machines or sawing devices not covered by one of groups B23D 45/00 - B23D 55/00

B23D 57/00

Arrangements for conveying, loading, turning, adjusting, or discharging the log or timber, specially designed for saw mills or sawing machines (B27B 29/00 takes precedence {; arrangements for raising or lowering the feed rollers of gang saw mills B27B 3/14; driving mechanisms for the feed rollers of gang saw mills B27B 3/16})
References
Limiting references

This place does not cover:

Arrangements for raising or lowering the feed rollers of gang saw mills

B27B 3/14

Driving mechanisms for the feed rollers of gang saw mills

B27B 3/16

Gripping, clamping, or holding devices for the trunk or log in saw mills or sawing machines; travelling trunk or log carriages

B27B 29/00

Article or material handling devices associated with conveyors

B65G 47/00

Informative references

Attention is drawn to the following places, which may be of interest for search:

Devices for determining the axis of a trunk

B27L 5/022

Sawing tools for saw mills, sawing machines, or sawing devices
References
Limiting references

This place does not cover:

Saw chains for slotting or mortising devices

B27F 5/08