EP3278934B1 - Pneumatisches werkzeug mit helmholtz-schalldämpfer - Google Patents

Pneumatisches werkzeug mit helmholtz-schalldämpfer Download PDF

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Publication number
EP3278934B1
EP3278934B1 EP16772772.6A EP16772772A EP3278934B1 EP 3278934 B1 EP3278934 B1 EP 3278934B1 EP 16772772 A EP16772772 A EP 16772772A EP 3278934 B1 EP3278934 B1 EP 3278934B1
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EP
European Patent Office
Prior art keywords
air discharge
air
discharge path
partition wall
chamber
Prior art date
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Active
Application number
EP16772772.6A
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English (en)
French (fr)
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EP3278934A1 (de
EP3278934A4 (de
Inventor
Yasumasa Suzuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nitto Kohki Co Ltd
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Nitto Kohki Co Ltd
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Publication of EP3278934A1 publication Critical patent/EP3278934A1/de
Publication of EP3278934A4 publication Critical patent/EP3278934A4/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/023—Helmholtz resonators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/026—Annular resonance chambers arranged concentrically to an exhaust passage and communicating with it, e.g. via at least one opening in the exhaust passage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/002—Apparatus adapted for particular uses, e.g. for portable devices driven by machines or engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/04—Silencing apparatus characterised by method of silencing by using resonance having sound-absorbing materials in resonance chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2310/00—Selection of sound absorbing or insulating material
    • F01N2310/02—Mineral wool, e.g. glass wool, rock wool, asbestos or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/02—Tubes being perforated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/02—Two or more expansion chambers in series connected by means of tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/06—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for hand-held tools or portables devices

Definitions

  • the present invention relates to an air tool with a Helmholtz silencer.
  • compressed air is supplied to an air motor from an external air compressor connected to an air supply path in a housing of the tool, and exhaust air from the air motor is passed through an air discharge path in the housing and discharged to the outside.
  • an air discharge passage is provided therein with a tubular member (silencer) extending along the air discharge passage to divide the air discharge passage into an inner passage and an outer passage which are coaxial with each other.
  • the tubular member is provided at each of its upstream and downstream ends with a plurality of circumferentially spaced openings.
  • a part of exhaust air flowing through the air discharge passage from upstream to downstream is diverted (dispersed) into the outer passage through the upstream openings and joined with the exhaust air flowing through the inner passage through the downstream openings, thereby attempting to achieve a silencing effect by the diversion (dispersion) of exhaust air and the friction of the air with the openings and the passage walls.
  • an air discharge path is filled with glass wool (sound-deadening material), thereby attempting to achieve a silencing effect.
  • H03-4743 A discloses a Helmholtz silencer for reducing engine intake noise which is formed by providing a resonance box (resonator) communicated with an intake path through a small-diameter passage extending from a side of the intake path.
  • US 5 142 952 A shows a ratchet tool.
  • the tool includes a housing having two substantially semi-cylindrical members.
  • An air motor in the housing has motor end members located adjacent each end thereof.
  • a manifold includes a chamber of a size that dampens Helmholtz frequencies in the exhaust air.
  • US 3 880 245 A is related to an exhaust noise attenuating system with muffler for pneumatic tools.
  • the pneumatic tool has incorporated therein a system including an arrangement of passages together with an expansion chamber, a sound resonator chamber, and a plug type screen muffler having internal screens.
  • An object of the present invention is to provide an air tool with a Helmholtz silencer having an unprecedentedly simple structure.
  • an air tool with a Helmholtz silencer as set forth in claim 1 includes the following: a housing having a motor chamber for accommodating an air motor, an air supply path for supplying compressed air to the motor chamber, and an air discharge path for passing exhaust air from the motor chamber to discharge the exhaust air to the outside from a downstream outlet; and a silencer member provided in the air discharge path along a longitudinal direction of the air discharge path to divide the interior of the air discharge path into a resonance chamber extending along the longitudinal direction of the air discharge path and an air discharge passage extending in the longitudinal direction adjacently to the resonance chamber, the air discharge passage being divided from the resonance chamber to receive exhaust air from the motor chamber and pass the exhaust air to the downstream outlet.
  • the silencer member has an opening communicating between the air discharge passage and the resonance chamber. The opening and the resonance chamber constitute, in combination, a sound-damping chamber using Helmholtz resonance.
  • the air tool according to the present invention has the above-described Helmholtz silencer and is therefore capable of suppressing noise transmitted to the outside through the air discharge path.
  • the air discharge path specifically extends rectilinearly from the downstream outlet upstream toward the motor chamber.
  • the silencer member is inserted into the air discharge path from the downstream outlet toward an upstream side where the motor chamber is located, thereby dividing the air discharge path into the resonance chamber and the air discharge passage.
  • the silencer member may have a plate-shaped partition wall configured such that when the silencer member is inserted in the air discharge path, the partition wall extends rectilinearly from the downstream outlet toward the upstream side, where the motor chamber is located, and the partition wall engages at peripheral edges thereof with an air discharge path wall defining the air discharge path, thereby dividing the interior of the air discharge path into the resonance chamber and the air discharge passage.
  • the partition wall is provided with the opening.
  • the silencer member has a plate-shaped second partition wall parallel spaced from the plate-shaped partition wall.
  • the second partition wall is configured such that when the silencer member is inserted in the air discharge path, the second partition wall engages at peripheral edges thereof with the air discharge path wall, which defines the air discharge path.
  • the two partition walls form a first and second resonance chambers, respectively, between themselves and the air discharge path wall.
  • the air discharge passage is defined between the two partition walls, and the second resonance chamber and the air discharge passage are communicated with each other through an opening formed in the second partition wall.
  • first and second resonance chambers may be communicated with each other through a communicating path traversing the air discharge passage.
  • the silencer member may have a connecting wall connecting respective downstream ends of the two partition walls.
  • the air discharge passage may have a sound-deadening material provided in a space defined by the connecting wall and the two partition walls.
  • the sound-deadening material may be configured to pass exhaust air flowing from upstream to downstream and to perform sound deadening.
  • the housing may have an air discharge pipe.
  • the air discharge pipe may define the air discharge path.
  • the air discharge pipe may be detachable with respect to the housing.
  • a belt sander 10 is illustrated in the drawings as one embodiment of an air tool according to the present invention.
  • the belt sander 10 includes an endless grinding belt 14 stretched around a pulley 12 set at a forward end (left end as seen in Fig. 1 ).
  • the endless grinding belt 14 is driven by an air motor 18 provided in a housing 16.
  • the structural and functional relation between the endless grinding belt 14 and the air motor 18 is disclosed, for example, in Japanese Patent Application Publication No. 2008-194769 , and various techniques relating thereto are widely known to those skilled in the art; therefore, a detailed explanation thereof is omitted herein.
  • the housing 16 has a cylindrical motor-accommodating part 22 having a motor chamber 20 accommodating an air motor (vane motor) 18.
  • the motor-accommodating part 22 has a peripheral wall portion provided with an air supply port 24 and an air discharge port 26 which are individually communicated with the motor chamber 20.
  • the housing 16 further has a handle part 34 accommodating an air supply-discharge pipe 32 provided with an air supply path 28 and an air discharge path 30.
  • the handle part 34 is configured to set the air supply-discharge pipe 32 so that the air supply path 28 and the air discharge path 30 are communicated with the air supply port 24 and the air discharge port 26, respectively.
  • the air supply path 28 is connected to an external air compressor, and an operation button 35 attached to the lower side of the housing 16 is pressed to open a switching valve 38 provided in the air supply path 28, thereby supplying compressed air into the motor chamber 20 through the air supply path 28 and the air supply port 24 to drive the air motor 18.
  • Exhaust air from the motor chamber 20 is discharged to the outside through the air discharge port 26 and the air discharge path 30.
  • the air discharge path 30 has an air discharge direction changing pipe member 36 attached to its right end (as seen in the drawings).
  • the air discharge direction changing pipe member 36 allows the air discharge direction to be changed to a desired direction by rotating the air discharge direction changing pipe member 36 about the longitudinal axis of the air discharge path 30.
  • the air discharge path 30 of the above-described belt sander 10 is provided therein with a Helmholtz silencer (resonator) configured as explained below.
  • the air discharge path 30 extends substantially rectilinearly from an outlet 30a at the right end toward the air discharge port 26 and has a silencer member 40, as shown in Fig. 5 , inserted therein from the outlet 30a toward the air discharge port 26 and secured therein.
  • the silencer member 40 has a plate-shaped first partition wall 42 and a plate-shaped second partition wall 44 which extend in the longitudinal direction of the air discharge path 30 and which are spaced from each other in a direction traversing the air discharge path 30, and a top connecting wall 45a and a bottom connecting wall 45b which connect the first partition wall 42 and the second partition wall 44 near the outlet 30a.
  • the bottom connecting wall 45b is configured to contact a bottom surface 30c of the air discharge path 30.
  • the first partition wall 42 and the second partition wall 44 substantially sealingly engage an air discharge path wall 30b defining the air discharge path 30 at their respective upper edges 42a and 44a, lower edges 42b and 44b, and forward end edges 42c and 44c.
  • the first partition wall 42 and the second partition wall 44 divide the interior of the air discharge path 30 into a first resonance chamber 46 and a second resonance chamber 48 which are laterally spaced from each other, and an air discharge passage 50 extending in the longitudinal direction of the air discharge path 30 between the two resonance chambers to receive and pass exhaust air from the motor chamber 20 to the outlet 30a of the air discharge path 30.
  • the silencer member 40 has an inclined plate 52 provided at the left end (as seen in the figure) of the silencer member 40.
  • the inclined plate 52 connects the lower portions of the first and second partition walls 42 and 44. Between a lower surface 52a of the inclined plate 52 and the air discharge path wall 30b is formed a communicating path 53 communicating between the first resonance chamber 46 and the second resonance chamber 48.
  • the first resonance chamber 46 and the second resonance chamber 48 form, in combination, a single resonance chamber.
  • the first partition wall 42 and the second partition wall 44 are each formed with a single small opening 54.
  • the openings 54 and the resonance chamber form a Helmholtz silencer using Helmholtz resonance.
  • the silencer member 40 is capable of being loaded and unloaded through the outlet 30a of the air discharge path 30, and a sound-deadening material 56, e.g. glass wool, can be set in a portion of the silencer member 40 at the bottom connecting wall 45b at the right end thereof in such a way that the sound-deadening material 56 is sandwiched between the first partition wall 42 and the second partition wall 44.
  • the first partition wall 42 and the second partition wall 44 have engaging projections 60 provided at their right ends, respectively. The engaging projections 60 are urged outward.
  • the silencer member 40 is secured by engaging the engaging projections 60 with respective holes (not shown) provided in the air discharge path wall 30b to extend therethrough.
  • the silencer member 40 can be removed from the air discharge path 30 by pushing the engaging projections 60 inward to disengage from the holes. Accordingly, the sound-deadening material 56 can be replaced easily by removing the silencer member 40 from the air discharge path 30.
  • the first partition wall 42 and the second partition wall 44 have ribs 58 provided on their outer surfaces, respectively, so that the ribs 58 engage the air discharge path wall 30b to support the partition walls 42 and 44.
  • the air tool 10 according to the present invention is provided with a Helmholtz silencer formed as stated above and is therefore capable of damping noise transmitted from the air discharge path to the outside.
  • a Helmholtz resonator is known to have, in principle, one opening provided for one resonance chamber. It has, however, been confirmed that a silencing effect can be obtained also with a Helmholtz resonator provided with a plurality of openings.
  • the present invention is not limited thereto but may be widely applied to air tools provided with an air discharge path for discharging exhaust air from an air motor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Portable Power Tools In General (AREA)
  • Exhaust Silencers (AREA)
  • Auxiliary Devices For Machine Tools (AREA)

Claims (8)

  1. Pneumatisches Werkzeug (10) mit einem Helmholtz-Schalldämpfer, wobei das pneumatische Werkzeug (10) Folgendes aufweist:
    ein Gehäuse (16), welches eine Motorkammer (20) zur Aufnahme eines pneumatischen Motors bzw. Druckluftmotors (18), einen Luftlieferpfad (28) zum Liefern von Druckluft an die Motorkammer (20) und einen Luftauslasspfad (30) zum Leiten von Auslassluft bzw. Abluft aus der Motorkammer (20), um die Abluft aus einem stromabwärts liegenden Auslass (30a) nach außen auszulassen; und
    ein Schalldämpferglied (40), welches in dem Luftauslasspfad (30) entlang einer Längsrichtung des Luftauslasspfades (30) vorgesehen ist, um ein Inneres des Luftauslasspfades (30) in eine Resonanzkammer (46, 48), die sich entlang der Längsrichtung des Luftauslasspfades (30) erstreckt, und in einen Luftauslassdurchlass (50) zu unterteilen, der sich in der Längsrichtung benachbart zu der Resonanzkammer (46, 48) erstreckt, wobei der Luftauslassdurchlass (50) von der Resonanzkammer (46, 48) abgeteilt ist, um Abluft aus der Motorkammer (20) aufzunehmen und die Abluft zu dem stromabwärts liegenden Auslass (30a) zu leiten und
    der Luftauslassdurchlass (50) sich geradlinig von dem stromabwärts liegenden Auslass (30a) stromaufwärts zu der Motorkammer (20) erstreckt und
    das Schalldämpferglied (40) eine Öffnung (54) hat, die zwischen dem Luftauslassdurchlass (50) und der Resonanzkammer (46, 48) eine Verbindung herstellt, wobei die Öffnung (54) und die Resonanzkammer (46, 48) in Kombination eine Schalldämpfungskammer unter Verwendung von Helmholtz-Resonanz bilden, dadurch gekennzeichnet, dass das Schalldämpferglied (40) in den Luftauslasspfad (30) von dem stromabwärts liegenden Auslass (30a) zu einer stromaufwärts liegenden Seite eingesetzt ist, wo die Motorkammer (20) angeordnet ist, wodurch der Luftauslasspfad (30) in die Resonanzkammer (46, 48) und den Luftauslassdurchlass (50) aufgeteilt wird.
  2. Pneumatisches Werkzeug (10) nach Anspruch 1, wobei das Schalldämpferglied (40) eine plattenförmige Unterteilungswand (42) hat, die so konfiguriert ist, dass, wenn das Schalldämpferglied (40) in den Luftauslasspfad (30) eingesetzt ist, die Unterteilungswand (42) sich geradlinig von dem stromabwärts liegenden Auslass (30a) zu der stromaufwärts liegenden Seite erstreckt, wo die Motorkammer (20) angeordnet ist, und die Unterteilungswand (42) an den Umfangskanten davon mit einer Luftauslasspfadwand (30b) in Eingriff ist, die den Luftauslasspfad (30) definiert, wodurch das Innere des Luftauslasspfades (30) in die Resonanzkammer (46) und den Luftauslassdurchlass (50) unterteilt wird, wobei die Unterteilungswand (42) mit der Öffnung (54) versehen ist.
  3. Pneumatisches Werkzeug (10) nach Anspruch 2, wobei das Schalldämpferglied (40) eine plattenförmige zweite Unterteilungswand (44) parallel beabstandet von der plattenförmigen Unterteilungswand (42) hat, wobei die zweite Unterteilungswand (44) so konfiguriert ist, dass, wenn das Schalldämpferglied (40) in den Luftauslasspfad (30) eingesetzt ist, die zweite Unterteilungswand (44) an ihren Umfangskanten mit der Luftauslasspfadwand (30b) in Eingriff kommt, welche den Luftauslasspfad (30) definiert, wobei die zwei Unterteilungswände (42, 44) eine erste Resonanzkammer (46) und eine zweite Resonanzkammer (48) bilden, und zwar entsprechend zwischen ihnen und der Luftauslasspfadwand (30b), wobei der Luftauslassdurchlass (50) zwischen den zwei Unterteilungswänden (42, 44) definiert ist, wobei die zweite Resonanzkammer (48) und der Luftauslassdurchlass (30) miteinander durch eine Öffnung (54) in Verbindung sind, die in der zweiten Unterteilungswand (44) geformt ist.
  4. Pneumatisches Werkzeug (10) nach Anspruch 3, wobei die ersten und zweiten Resonanzkammern (46, 48) miteinander durch einen Verbindungspfad (53) in Verbindung sind, der durch den Luftauslassdurchlass (50) verläuft.
  5. Pneumatisches Werkzeug (10) nach Anspruch 3 oder 4, wobei das Schalldämpferglied (40) eine Verbindungswand (45a, 45b) hat, welche jeweilige stromabwärts liegende Enden der zwei Unterteilungswände (42, 44) verbindet.
  6. Pneumatisches Werkzeug (10) nach Anspruch 5, wobei der Luftauslassdurchlass (50) ein schalldämpfendes Material (56) hat, welches in einem Raum vorgesehen ist, der durch die Verbindungswand (45a, 45b) und die zwei Unterteilungswände (42, 44) definiert wird, wobei das schalldämpfende Material (56) konfiguriert ist, um Abluft, welche von stromaufwärts nach stromabwärts fließt, durchzulassen und eine Schalldämpfung auszuführen.
  7. Pneumatisches Werkzeug (10) nach einem der Ansprüche 1 bis 6, wobei das Gehäuse (16) ein Luftauslassrohr (32) aufweist, wobei das Luftauslassrohr (32) den Luftauslasspfad (30) definiert.
  8. Pneumatisches Werkzeug (10) nach Anspruch 7, wobei das Luftauslassrohr (32) bezüglich des Gehäuses (16) demontierbar ist.
EP16772772.6A 2015-03-31 2016-03-29 Pneumatisches werkzeug mit helmholtz-schalldämpfer Active EP3278934B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015070984A JP6382143B2 (ja) 2015-03-31 2015-03-31 ヘルムホルツ型消音装置を備えたエア工具
PCT/JP2016/060001 WO2016158891A1 (ja) 2015-03-31 2016-03-29 ヘルムホルツ型消音装置を備えたエア工具

Publications (3)

Publication Number Publication Date
EP3278934A1 EP3278934A1 (de) 2018-02-07
EP3278934A4 EP3278934A4 (de) 2018-11-21
EP3278934B1 true EP3278934B1 (de) 2021-02-24

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EP16772772.6A Active EP3278934B1 (de) 2015-03-31 2016-03-29 Pneumatisches werkzeug mit helmholtz-schalldämpfer

Country Status (6)

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EP (1) EP3278934B1 (de)
JP (1) JP6382143B2 (de)
KR (1) KR101959160B1 (de)
CN (1) CN107405766B (de)
TW (1) TWI601608B (de)
WO (1) WO2016158891A1 (de)

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Publication number Priority date Publication date Assignee Title
US20210062695A1 (en) * 2019-08-28 2021-03-04 Snap-On Incorporated Pneumatic tool exhaust muffler
US11867102B2 (en) * 2019-08-28 2024-01-09 Snap-On Incorporated Pneumatic tool exhaust muffler

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KR101959160B1 (ko) 2019-03-15
JP2016190288A (ja) 2016-11-10
TW201703944A (zh) 2017-02-01
EP3278934A1 (de) 2018-02-07
TWI601608B (zh) 2017-10-11
CN107405766B (zh) 2020-06-26
KR20170128466A (ko) 2017-11-22
CN107405766A (zh) 2017-11-28
JP6382143B2 (ja) 2018-08-29
WO2016158891A1 (ja) 2016-10-06
EP3278934A4 (de) 2018-11-21

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