US3270834A - Pneumatic tool having exhaust noise reducing means - Google Patents

Pneumatic tool having exhaust noise reducing means Download PDF

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Publication number
US3270834A
US3270834A US486317A US48631765A US3270834A US 3270834 A US3270834 A US 3270834A US 486317 A US486317 A US 486317A US 48631765 A US48631765 A US 48631765A US 3270834 A US3270834 A US 3270834A
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US
United States
Prior art keywords
sleeve
shoulder
exhaust
housing
noise reducing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US486317A
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English (en)
Inventor
Bratt Sven-Ake
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.)
Atlas Copco AB
Original Assignee
Atlas Copco AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Atlas Copco AB filed Critical Atlas Copco AB
Priority to US486317A priority Critical patent/US3270834A/en
Priority to DEA26095U priority patent/DE1946215U/de
Priority to GB38767/66A priority patent/GB1116709A/en
Application granted granted Critical
Publication of US3270834A publication Critical patent/US3270834A/en
Priority to ES0331021A priority patent/ES331021A1/es
Priority to NL6612739A priority patent/NL6612739A/xx
Priority to CH1304666A priority patent/CH440741A/de
Priority to SE12156/66A priority patent/SE346246B/xx
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/11—Arrangements of noise-damping means
    • B25D17/12—Arrangements of noise-damping means of exhaust silencers
    • 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
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/082—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases passing through porous members

Definitions

  • This invention relates to pneumatic tools having exhaust noise reducing means and more particularly to rotary air motor powered tools and actuators in which the noise reduction is performed by a sound absorbing member of relatively rigid porous material such as sintered bronze.
  • Pneumatic tools have been provided with a member or ring of porous sintered bronze across the exhaust air passage or passages from the rotary air motor in the tool housing.
  • These members or rings have hitherto been mounted to present a single integral porous barrier to the exhaust air stream but the noise reducing action thus achieved is usually insufiicient particularly when such barrier has its outer face open directly to the ambient atmosphere.
  • the elforts to improve noise reduction markedly by increasing the thickness of the barrier or changing its geometrical shape have been unsuccessful.
  • the barrier has therefore been mounted internally of the tool with exhaust expansion passages and chambers extending downstream thereof to the atmosphere and providing additional noise reduction. This solution is constructionally complicated and costly and makes replacement and cleaning of clogged noise reducing members inconvenient.
  • the primary object of the invention is to provide a pneumatic tool or actuator with improved exhaust noise reducing means in direct communication with the atmosphere and capable of a very high degree of noise reduction. Another object of the invention is to provide simplified easy access to the noise reducing elements of such improved noise reducing means. A further object of the invention is to provide improved noise reducing means convenient and simple in application on tools with forwardly as well as rearwardly or laterally directed exhaust.
  • a pneumatic tool for these and other purposes there is provided in a pneumatic tool a generally cylindrical housing, a rotary air motor mounted within said housing, a cylindrical annular exhaust funnel in said housing and coaxial therewith, air exhaust passages longitudinally disposed within the housing connecting the outlet side of said air motor with one end of said funnel, said funnel having opening means communicating directly with the atmosphere at its end opposite to said exhaust passage, at least two noise reducing rings of porous sintered material mounted in axially stacked relation in and across said funnel for reducing the noise of the exhaust air passing from said exhaust passages through said tunnel to the atmosphere, and means in said funnel for keeping said rings axially spaced in said funnel under the formation of a substantially annular expansion chamber for the exhaust air adjacent at least one of the axial faces of each ring in said funnel for increasing the noise reduction therein.
  • FIG. 1 is a partially sectioned side elevational view of a pneumatic tool incorporating the exhaust noise reducing means of the present invention.
  • FIG. 2 is a sectional view taken on the line 22 of FIG. 1.
  • FIG. 3 is a perspective view of a noise reducing insert 3,270,834 Patented Sept. 6, 1966 ice included in the noise reducing means shown in FIG. 1.
  • FIG. 4 is a fragmental sectional view of a noise reducing means of modified construction incorporating three noise reducing inserts.
  • FIG. 5 is a sectional view taken on the line 5-5 of FIG. 1.
  • FIG. 6 is a partially sectioned side elevational view of a pneumatic tool including a modified disposition of the noise reducing means of FIG. 1.
  • FIG. 7 is a partially sectioned side elevational view of a pneumatic tool including another modified disposition of the noise reducing means.
  • FIG. 8, finally, is a fragmental sectional view of a still further modification of the noise reducing means.
  • the pneumatic tool chosen for illustration is a pneumatic screw driver 10 powered by the usual rotary vane rmotor. Compressed air enters through a threaded bushing 11 located at the rear end of the tool 10 and passes via a supply passage 12 into a valve chamber 13. A spring pressed valve 14 positioned within the tool 10 with its stem extending therefrom to be actuated through a hand operated lever 15 controls the fiow of air from the chamber 13 into a passage 16 which is in flow communication with inlet passage means 17 in a cylinder 20 forming the motor cylinder of the rotary vane type motor of the tool 10.
  • the cylinder 20 has provided therein a rotor 21 in which a plurality of vanes 22 are slidably mounted in radial grooves 23.
  • compressed air entering the inlet passage means 17 successively acts against the vanes 22 to rotate the rotor 21 around its axis.
  • the working air expands and moves the vanes 22 in peripheral direction passing from the inlet passage means 17 to outlet passage means 25 which are in fiow communication with an annular internal recess 26 in the tool 10.
  • From the recess 26 a plurality of exhaust passage means 27 extend axially to the rear of the tool 10 terminating adjacent one end of a cylindrical outer surface 28 forming part of the tool 10 and disposed around the threaded end of the inlet bushing 11.
  • a radial shoulder 29 intersecting the exhaust passage means 27 is provided adjacent to the surface 28.
  • the central portion 30 of the tool 10 forms a cylindrical hand grip portion whereby the tool 10 can be grasped manually with the operators hand in convenient position for actuating or releasing the lever 15 of the valve 14.
  • the lever 15 With the lever 15 depressed and consequently the valve 14 open, the compressed air causes the rotor 21 to rotate and through suitable gears and transmission axles, not shown, the rotor 21 produces power rotation of a screw driver 31 in a manner well known in the art.
  • the exhaust air passed to the shoulder 29 would normally emit an objectionable high-pitched operating noise to the ambient atmosphere and exhaust noise reducing means are therefore provided axially of the exhaust passage means 27.
  • An open ended sleeve 32 having an inturned annular flange 34 thereon is mounted around and in spaced parallel relation to the outer surface 28 with the flange 34 resting against the shoulder 29.
  • the internal aperture of the flange 34 is disposed radially outwardly of the passage means 27 and the sleeve 32 thus defines an exhaust funnel around the surface 28 connecting the exhaust passages 27 to the atmosphere.
  • At least two axially spaced noise reducing rings 36 are mounted in stacked relation in and across the funnel within the sleeve 32.
  • the rings 36 are rectangular in cross section and of relatively rigid porous material, preferably porous sintered bronze.
  • the axial spacing between the rings 36 is preferably provided by axial lugs 37 formed integral with each ring 36 at the one axial face thereof, FIG. 3.
  • the lugs of the inner ring 36 are supported by the flange 34 of the sleeve 32 while the lugs of the outer ring 36 are resting directly against the inner ring 36.
  • Substantially uninterrupted annular expansion chambers are formed for the exhaust air adjacent at least one of the axial faces of each ring 36. This improves to a substantial degree the total noise reduction produced by the present noise reducing means.
  • Removable abutment means are provided on the outer surface 28 consisting of a resilient split ring 38 received in a groove 39 in the surface 28 in a position to keep the rings 36 stacked within the sleeve 32 and on the flange 34 thereof and with the flange 34 resting against the shoulder 29.
  • FIG. 4 there are provided three porous rings 40 preferably of sintered bronze in the funnel formed between the outer cylindrical surface 28 and the sleeve 32.
  • These rings 40 are rectangular in cross section but without the lugs 37 shown in FIG. 3.
  • the axial spacing for purposes of creating annular expansion chambers between the rings 40 is provided by cylindrical spacing sleeves 41 inserted between each ring 40 and between the innermost ring 40 and the flange 34.
  • the sleeve 32, the rings 40, and the spacing sleeves 41 are secured in place against the shoulder 29 by a split ring 38 disposed as before in a groove 39 at the outer end of the surface 28.
  • the rings 36, 40 can easily be replaced when clogged simply by axial removal of the sleeve 32 upon removal of the resilient ring 38 and the bushing 11, whereupon a sleeve 32 with a cleaned set of rings therein can be slipped in place against the shoulder 29 and locked by the ring 38.
  • the pneumatic tool 10 is a hand drill carrying rotatably a drill chuck 42 at the forward end thereof.
  • the forward end of the rotor 21 is mounted to cooperate with planetary gearing 43, 44 in order to produce the desired rotational speed reduction of the chuck 42.
  • the tool 10 carries a front over sleeve 46 threaded to the forward end thereof and the inner end of the cover sleeve 46 forms an abutment 47 for securing noise reducing means similar to the means embodied in FIG.
  • a flanged sleeve 32 rests with its flange against the radial shoulder 29 and carries stacked noise reducing inserts 36 of porous relatively rigid material therein having integral lugs 37 for the axial spacing therebetween and between the flange of the sleeve 32
  • the sleeve 32 and its inserts 36 are secured in place between the abutment 47 and the shoulder 29
  • the outlet passage means 25 from the motor cylinder 20 extend in forward direction communicating with the internal space around the planetary gearing 43, 44 from which the exhaust passes radial bores 50 to the inner end of the exhaust funnel inside the sleeve 32 and thence through the inserts to the ambient atmosphere in forward direction.
  • Such forwardly directed exhaust can be chosen for work of a character permitting air to be blown past the parts operated upon by the tool.
  • the exhaust noise reducing means are similarly to the embodiment depicted in FIG. disposed adjacent the central gripping portion 30 of the tool 10 but are directed to provide rearward exhaust.
  • the surface 28 and the shoulder 29 are therefore disposed at the rear end of the central portion 30 and outlet passage means 25 from the cylinder 20 extend rearwardly to radial through bores 50 adjacent 1 the shoulder 29
  • the sleeve 32 with its rings 36 is kept against the shoulder 29 by a flange 51 on a rear housing 52, which is threaded int-o the rear end of the central portion 30.
  • the bushing 11, the pas-sages 12 and 16, the valve 14 and its lever 15 are all provided in connection with the rear housing 52 and are identical in operation with the corresponding details in the embodiment depicted in FIG. 1.
  • the embodiment of the noise reducing means of the tool or actuator 10 shown in FIG. 8 incorporates a modified sleeve 32 resting with one end thereof against the shoulder 29 while being provided with an annular inner flange 53 at the opposite end thereof.
  • the flange 53 fits snugly around the surface 28 and cooperates with the locking abutment provided by the split resilient ring 38 in its groove 39 for keeping the sleeve fixed against the shoulder 29.
  • axially spaced noise reducing rings 36 of porous material preferably sintered bronze
  • axial spacing means such as lugs 37, FIGS. 3 and 7.
  • An additional spacing sleeve 55 may be provided around the surface 28 between the outermost ring 36 and the flange 53.
  • a pneumatic tool a generally cylindrical housing, a rotary air motor mounted within said housing, a cylindrical external surface on said housing with one end thereof terminating in an annular shoulder radially outwardly of said surface, air exhaust passages longitudinally disposed within the housing connecting the outlet side of said air motor with the end of said external surface adjacent said shoulder, a sleeve extending from said shoulder in substantially parallel spaced relation to said external surface, opening means in said sleeve communicating directly with the atmosphere at the end of said sleeve opposite to said shoulder, a plurality of noise reducing rings of relatively rigid porous material mounted in axially stacked relation between said external surface and said sleeve for supporting said sleeve around said surface and for reducing the noise of the exhaust air issuing from said exhaust passages through said sleeve to the atmosphere, and means in said sleeve for keeping said rings axially spaced therein under the formation of a substantially annular expansion chamber for the exhaust air adjacent at least one of the axial faces of each
  • said spacing means being axial lugs integral with said rings and provided on one of the axial faces of each ring.
  • a valve mechanism for controlling said inlet passage including a movable valve member adapted to be manually actuated from seated to unseated position when said housing is grasped manually to permit air flow through said inlet passage, said external surface being provided on said housing rearwardly of said air motor therein, and said sleeve having its end opposite to said shoulder directed axially away from said motor to phere at its end opposite to said shoulder, and a resilient locking ring removably fixed to said surface opposite to said shoulder and cooperating with the axially outermost ring for keeping said noise reducing rings stacked between said flange and said locking ring thereby also keeping saidflange against said shoulder.
  • a generally cylindrical housing providing a gripping portion centrally thereon, a rotary air motor mounted within said housing, an air inlet pasaxial spacing between said rings when stacked in said sage in said housing to said motor, a valve mechanism funnel.
  • a pneumatic tool for controlling said inlet passage and including a movable -8.
  • a pneumatic tool a generally cylindrical housing, valve member, lever means cooperating with said valve a rotary air motor mounted within said housing, a cylinmember for moving it from seated to unseated position drical annular exhaust funnel in said housing, air exhaust when said gripping portion is grasped manually to permit passages longitudinally disposed within the housing conair flow through said inlet passage to said motor, a cylinmeeting the outlet side of said air motor with one end of drical external surface at one end of said housing and havsaid funnel, said funnel having opening means communiing a reduced diameter with respect to said gripping porcating directly with the atmosphere at its end opposite to tion, an annular shoulder between said surface and said 10 said exhaust passages, at least two noise reducing rings gripping portion, air exhaust passages longitudinally disof porous sintered material mounted in axially stacked posed within said housing connecting th o tl t

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Tires In General (AREA)
  • Duct Arrangements (AREA)
US486317A 1965-09-10 1965-09-10 Pneumatic tool having exhaust noise reducing means Expired - Lifetime US3270834A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US486317A US3270834A (en) 1965-09-10 1965-09-10 Pneumatic tool having exhaust noise reducing means
DEA26095U DE1946215U (de) 1965-09-10 1966-07-23 Vorrichtung zur schalldaempfung im auslasskanal druckluftbetriebener werkzeuge.
GB38767/66A GB1116709A (en) 1965-09-10 1966-08-31 Improvements in pneumatic tools having exhaust noise reducing means
ES0331021A ES331021A1 (es) 1965-09-10 1966-09-08 Perfeccionamientos en los elementos apaga-ruidos de los utiles neumaticos.
NL6612739A NL6612739A (de) 1965-09-10 1966-09-09
CH1304666A CH440741A (de) 1965-09-10 1966-09-09 Vorrichtung zur Schalldämpfung im Auslasskanal druckluftbetriebener Werkzeuge
SE12156/66A SE346246B (de) 1965-09-10 1966-09-09

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US486317A US3270834A (en) 1965-09-10 1965-09-10 Pneumatic tool having exhaust noise reducing means

Publications (1)

Publication Number Publication Date
US3270834A true US3270834A (en) 1966-09-06

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Application Number Title Priority Date Filing Date
US486317A Expired - Lifetime US3270834A (en) 1965-09-10 1965-09-10 Pneumatic tool having exhaust noise reducing means

Country Status (7)

Country Link
US (1) US3270834A (de)
CH (1) CH440741A (de)
DE (1) DE1946215U (de)
ES (1) ES331021A1 (de)
GB (1) GB1116709A (de)
NL (1) NL6612739A (de)
SE (1) SE346246B (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3381773A (en) * 1966-03-30 1968-05-07 Philips Corp Acoustic resistance
US3672465A (en) * 1970-10-15 1972-06-27 Blatt Leland F Gas exhaust silencer
US3809179A (en) * 1973-04-18 1974-05-07 Dresser Ind Exhaust muffler for pneumatic tools
US3960239A (en) * 1973-08-15 1976-06-01 Barry Wright Corporation Noise-reducing fluid-flow devices
FR2554753A1 (fr) * 1983-11-15 1985-05-17 Desoutter Ltd Outil a moteur pneumatique
US4693339A (en) * 1986-10-16 1987-09-15 Newport News Shipbuilding And Dry Dock Company Muffler for gas inducting machinery generating low frequency noise
US5309714A (en) * 1990-05-21 1994-05-10 Snap-On Tools Corporation Ratchet tool with exhaust chamber manifold with sound dampening properties
US5581055A (en) * 1995-08-04 1996-12-03 Kevin G. Self Muffler for air operated hand tools and other pneumatic devices
WO2001056749A1 (en) * 2000-01-27 2001-08-09 S P Air Kk Hand-held pneumatic rotary drive device having an adjustable air exhaust
US6530436B2 (en) * 2001-03-29 2003-03-11 Snap-On Technologies, Inc. Pneumatic tool with muffler bypass mechanism
US20030136570A1 (en) * 2000-09-08 2003-07-24 Osamu Izumisawa Pneumatic rotary tool
US20070056758A1 (en) * 2005-08-24 2007-03-15 Sunmatch Industrial Co., Ltd. Rear exhaust type pneumatic tool
US20070151075A1 (en) * 2000-01-27 2007-07-05 Sp Air Kabushiki Kaisha Pneumatic rotary tool
US20070251709A1 (en) * 2006-04-27 2007-11-01 Sun Yung-Yung Pneumatic tool
US20080029281A1 (en) * 2006-04-27 2008-02-07 Sun Yung-Yung Pneumatic tool
US20080190635A1 (en) * 2005-04-05 2008-08-14 Anders Urban Nelson Pneumatic Power Tool with Exhaust Silencer
WO2009086619A1 (en) * 2008-01-04 2009-07-16 Audeval Solutions Inc. Muffler for pneumatic handheld tool
CN110500139A (zh) * 2019-09-18 2019-11-26 王建丰 一种低噪音钻机的气动装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018291A (en) * 1974-12-23 1977-04-19 Allied Steel & Tractor Products, Incorporated Pneumatic hammer
SE440759B (sv) * 1984-03-20 1985-08-19 Atlas Copco Ab Reverserbart tryckluftverktyg

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950775A (en) * 1958-01-13 1960-08-30 Aro Equipment Corp Exhaust noise reducing and air diffusing means for pneumatic motors
US3202239A (en) * 1963-06-10 1965-08-24 Clarke Ronald Albert William Acoustic shield for a tool powered by a gas-operated motor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950775A (en) * 1958-01-13 1960-08-30 Aro Equipment Corp Exhaust noise reducing and air diffusing means for pneumatic motors
US3202239A (en) * 1963-06-10 1965-08-24 Clarke Ronald Albert William Acoustic shield for a tool powered by a gas-operated motor

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3381773A (en) * 1966-03-30 1968-05-07 Philips Corp Acoustic resistance
US3672465A (en) * 1970-10-15 1972-06-27 Blatt Leland F Gas exhaust silencer
US3809179A (en) * 1973-04-18 1974-05-07 Dresser Ind Exhaust muffler for pneumatic tools
US3960239A (en) * 1973-08-15 1976-06-01 Barry Wright Corporation Noise-reducing fluid-flow devices
FR2554753A1 (fr) * 1983-11-15 1985-05-17 Desoutter Ltd Outil a moteur pneumatique
DE3441468A1 (de) * 1983-11-15 1985-05-23 Desoutter Ltd., London Pneumatik-kraftwerkzeug
US4693339A (en) * 1986-10-16 1987-09-15 Newport News Shipbuilding And Dry Dock Company Muffler for gas inducting machinery generating low frequency noise
US5309714A (en) * 1990-05-21 1994-05-10 Snap-On Tools Corporation Ratchet tool with exhaust chamber manifold with sound dampening properties
US5581055A (en) * 1995-08-04 1996-12-03 Kevin G. Self Muffler for air operated hand tools and other pneumatic devices
US6695072B2 (en) 2000-01-27 2004-02-24 S. P. Air Kabushiki Kaisha Hand-held pneumatic rotary drive device having an adjustable air exhaust
WO2001056749A1 (en) * 2000-01-27 2001-08-09 S P Air Kk Hand-held pneumatic rotary drive device having an adjustable air exhaust
USRE39009E1 (en) 2000-01-27 2006-03-14 S.P. Air Kabusiki Kaisha Hand-held pneumatic rotary drive device
US20070151075A1 (en) * 2000-01-27 2007-07-05 Sp Air Kabushiki Kaisha Pneumatic rotary tool
US7404450B2 (en) 2000-01-27 2008-07-29 S.P. Air Kabusiki Kaisha Pneumatic rotary tool
US20030136570A1 (en) * 2000-09-08 2003-07-24 Osamu Izumisawa Pneumatic rotary tool
US6796386B2 (en) 2000-09-08 2004-09-28 S.P. Air Kabusiki Kaisha Pneumatic rotary tool
US6530436B2 (en) * 2001-03-29 2003-03-11 Snap-On Technologies, Inc. Pneumatic tool with muffler bypass mechanism
US20080190635A1 (en) * 2005-04-05 2008-08-14 Anders Urban Nelson Pneumatic Power Tool with Exhaust Silencer
US8528659B2 (en) * 2005-04-05 2013-09-10 Atlas Copco Industrial Technique Aktiebolag Pneumatic power tool with exhaust silencer
US20070056758A1 (en) * 2005-08-24 2007-03-15 Sunmatch Industrial Co., Ltd. Rear exhaust type pneumatic tool
US20080029281A1 (en) * 2006-04-27 2008-02-07 Sun Yung-Yung Pneumatic tool
US20070251709A1 (en) * 2006-04-27 2007-11-01 Sun Yung-Yung Pneumatic tool
WO2009086619A1 (en) * 2008-01-04 2009-07-16 Audeval Solutions Inc. Muffler for pneumatic handheld tool
US20100288581A1 (en) * 2008-01-04 2010-11-18 Audeval Solutions Inc. Muffler for pneumatic handheld tool
US8047327B2 (en) * 2008-01-04 2011-11-01 Audeval Solutions Inc. Muffler for pneumatic handheld tool
CN110500139A (zh) * 2019-09-18 2019-11-26 王建丰 一种低噪音钻机的气动装置

Also Published As

Publication number Publication date
ES331021A1 (es) 1967-07-01
GB1116709A (en) 1968-06-12
CH440741A (de) 1967-07-31
SE346246B (de) 1972-07-03
NL6612739A (de) 1967-03-13
DE1946215U (de) 1966-09-15

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