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PERCUSSIVE TOOLS [N: (percussive machines for forging B21J; hand-held drilling machines, in general B23B 45/00, for wood B27C 3/08; drilling machines, used for mining or quarrying, with reciprocating tool which is turned intermittently when out of contact with the working face E21B 1/00) ]
Definition statement
This subclass/group covers:
  • Hand tools for carrying out strokes, e.g. hammers or picks.
  • Hand tools for transmitting strokes, e.g. chisels or punches.
  • Portable power-driven percussive tools with fluid-pressure drive, electromotor drive or electromagnetic drive, e.g. compressed-air hammers.
  • Portable percussive tools using centrifugal or rotary impact elements for axial percussion.
  • Portable percussive machines with superimposed rotation, e.g. drill hammers.
  • Details of, or accessories for, portable power-driven percussive tools.
Relationship between large subject matter areas

This subclass is a function-oriented place for classifying percussive hand tools and portable power-driven percussive tools, the primary function of which is to generate percussive action.

Hand tools and portable power-driven tools with percussive action for supporting another primary function, e.g. cutting, are classified in the relevant places for the primary function. For example, hand-held cutting tools employing percussive action for cutting, such as axes or hatchets, are classified in B26B 23/00. However, impact drilling machines with percussive action for supporting the drilling operation are classified in B25D 11/00, B25D 16/00 and/or B25D 17/00.

Hand tools and portable power-driven tools with percussive action which are specially adapted or used for a particular purpose are classified in the relevant application-oriented places. For example, hand tools especially for nailing or stapling are classified in subclass B25C, e.g. nail punches. Pick hammers and chisels especially for mining or quarrying are classified in E21C 37/24 and E21C 37/26. Mortise chisels for wood-working are classified in B27G17/08.

References relevant to classification in this subclass
This subclass/group does not cover:
Non-abrasive sharpening devices for scythes, sickles, or the like with percussive tools
Hand-operated implements for threshing
Meat pounders
Carpet beaters
Instruments for medical or veterinary examination by percussion
Drill bits for combined rotation and percussion
Machines or apparatus for embossing decorations or marks
Hand-held nailing or stapling tools
Combination or multi-purpose hand tools not otherwise provided for
Mortise chisels for wood-working
B27G17/08
Pick hammers for mining or quarrying, specially adapted for dislodging minerals
Chisels for mining or quarrying
Informative references
Attention is drawn to the following places, which may be of interest for search:
Emergency hammer to break car windows
Golf clubs
Bats, rackets, or the like, for other games
Disintegrating by mills having rotary beater elements
Processes or apparatus for generating mechanical vibrations making use of mechanical energy
Removing local distortions
Deforming sheet metal, tubes or profiles by sequential impacts, e.g. hammering
Forging machines with hammers or die jaws acting by impact
Treating or finishing surfaces by hammering
Impact wrenches or screwdrivers
Portable power-driven screw or nut setting or loosening tools with means for imparting impact to screwdriver blade or nut socket
Hand tools for fitting together or separating parts employing impacting means
B25B27/067
Axes or hatches
Working stone or stone-like materials by impact tools, e.g. by chisels
Knocking devices for preventing bridge formation in large containers
Tamping apparatus for consolidating or finishing laid-down unset paving material
Tampers for compacting soil
Methods or apparatus for placing sheet pile bulkheads, piles, mould-pipes, or other moulds by driving
Percussion drilling of earth or rock
Fishing for or freeing objects in boreholes or wells using impact means for releasing stuck parts
Cutting machines slitting solely by one or more percussive tools moved through the seam in mining or quarrying applications
Ice picks
Percussion or firing pins or hammers of firearms
Batons, truncheons, sticks, shillelaghs
Percussive musical instruments
Clappers or other strikers for bells
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Hand hammer
Hand tool for carrying out a stroke with a striking face which is not intended to penetrate the material or object to be struck.
Pick
Hand tool for carrying out a stroke with a pointed striking tip or edge which is intended to penetrate the material or object to be struck.
Hand hammers [N: (handles therefor B25G 1/00; attachment of handles to the hammer head B25G 3/00 )]; Hammer heads of special shape or materials
Definition statement
This subclass/group covers:

This main group covers:

Hand hammers, e.g. with details of hammer head, shock-absorbing means, etc. Examples:

Withdrawing or holding nails, B25D 1/04 (US2007/089571 A)

Shock-absorbing means, B25D 1/12 (US2007/113709 A)

Impacting head in the form of a sleeve slidable on a shaft, B25D 1/16 (US2007/181320 A)

References relevant to classification in this group
This subclass/group does not cover:
Handles for hand hammers
Attachment of handles to the hammer head
Hand chisels
Definition statement
This subclass/group covers:

This main group covers:

Hand chisels. Example:

B25D 3/00 (US2007/062046 A)

References relevant to classification in this group
This subclass/group does not cover:

Examples of places where the subject matter of this group is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Mortise chisels for wood-working
B27G17/08
Informative references
Attention is drawn to the following places, which may be of interest for search:
Working stone or stone-like materials by impact tools, e.g. by chisels
Centre punches
Definition statement
This subclass/group covers:

This main group covers:

Centre punches, also automatic. Example :

Automatic centre punch, B25D 5/02 (FR1509013 A)

Picks [N: (combined with other tools B25F)]
Definition statement
This subclass/group covers:

This main group covers:

Picks. Example:

B25D 7/00 (US2462427 A)

Informative references
Attention is drawn to the following places, which may be of interest for search:
Picks combined with other tools
Portable percussive tools with fluid-pressure drive, [N: i.e. driven directly by fluids], e.g. having several percussive tool bits operated simultaneously [N: (B25D15/00; portable non-percussive drilling tools driven by fluid pressure or pneumatic power B23B 45/04 )]
Definition statement
This subclass/group covers:

This main group covers:

Means for driving the impulse member in a portable percussive tool with fluid-pressure drive, e.g. air pressure, internal-combustion engine, detonation of a cartridge, hydraulic pressure. Control devices for the reciprocating piston, details of valve arrangements therefore. Examples:

Tool bit is hit by an impulse member, B25D 9/04 (EP0836545 A)

Piston-type slide valves, B25D 9/18, and tubular-type slide valves, B25D 9/20

(EP1907141 A)

Automatic stopping when the tool is lifted from the working face, B25D 9/265

(EP0617926 A)

Informative references
Attention is drawn to the following places, which may be of interest for search:
Portable non-percussive drilling tools driven by fluid pressure or pneumatic power
Control systems for adjusting the stroke of the piston, or the force or frequency of impact thereof, adapted for earth drilling
Portable percussive tools with electromotor [N: or other motor] drive
Definition statement
This subclass/group covers:

This main group covers:

Means for driving the impulse member in a portable percussive tool with electromotor drive, e.g. wobbling mechanism, electromagnetic drive, centrifugal or rotary impact elements, worm mechanism, cam mechanism, crank mechanism. Examples:

Wobbling mechanism / swash plate, B25D 11/062 (EP2129494 A)

Electromagnetic drive, B25D 11/064 (EP2036680 A)

Worm mechanism, B25D 11/08 (US2051053 A)

Cam mechanism, coaxial cam member and cam follower of the same shape, B25D11/11B4 (FR2868977 A)

Crank mechanism with fluid cushion, B25D 11/125 (WO2004060615 A)

References relevant to classification in this group
This subclass/group does not cover:
Portable power-driven tools with rotary impact
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:

In this main group, the following terms (or expressions) are used with the meaning indicated:

Cam mechanism
Comprising a rotating cam member which might be coaxial with the tool, and interacting with a cam surface defined by rollers, balls, or the same shape as the cam member.
Crank mechanism
Comprising a rotating plate, an offset pin, a crank arm, a piston, and optionally a fluid cushion.
Wobbling mechanism
Comprising a swash-plate, attached to a rotating shaft with a slight angular displacement, and provoking an oscillating linear movement of a follower
Worm mechanism
A continuous guide surface with steadily rising and falling incline
Portable percussive machines with superimposed rotation, [N: the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit (combined percussion and rotary drilling adapted for earth drilling E21B 6/00 )]
Definition statement
This subclass/group covers:

This main group covers:

Also clutches and mode changers specially adapted for portable percussive machines with superimposed rotation. Example:

Mode changer, B25D 16/006 (GB2472890 A)

Informative references
Attention is drawn to the following places, which may be of interest for search:
Gear boxes, clutches, bearings, feeding mechanisms or like equipment for hand-held portable drilling machines
Gearings, speed selectors, clutches or the like specially adapted for rotary tools
Details of, or accessories for, portable power-driven percussive tools [N: (details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F 5/00 )]
Definition statement
This subclass/group covers:

This main group covers:

Attachments or adapters, percussive tool bits, constructional details. Examples:

Handles resiliently mounted relative to the hammer housing, B25D 17/043 (WO2007115845 A)

Means for retaining and guiding the tool bit, with radial movable locking elements, B25D 17/088 (EP2170562 A)

Damping the reaction force, B25D 17/24 (EP1736283 A)

Informative references
Attention is drawn to the following places, which may be of interest for search:
Details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed
Drill bits for earth drilling
Drill bits for rotation and/or percussion
Noise damping in general
Exhaust silencers in general
Dampers in connections of hammers to backhoes; connections of hammers to backhoes
E02F3/96D6
Lubricating in general
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Last Modified: 10/11/2013