US3891049A - Pneumatic tool construction - Google Patents

Pneumatic tool construction Download PDF

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Publication number
US3891049A
US3891049A US391289A US39128973A US3891049A US 3891049 A US3891049 A US 3891049A US 391289 A US391289 A US 391289A US 39128973 A US39128973 A US 39128973A US 3891049 A US3891049 A US 3891049A
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US
United States
Prior art keywords
channel
curved
portions
outlet openings
housing
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
US391289A
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English (en)
Inventor
Reinhold Stroezel
Alfred Hettich
Alfredo Civarella
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
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Publication of US3891049A publication Critical patent/US3891049A/en
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
    • 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
    • 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

Definitions

  • the present invention relates to a pneumatic tool construction in general, and more particularly to an auxiliary muffler for use with pneumatic tools.
  • Another object of the invention is to provide such a construction wherein an auxiliary muffler is provided which not only assures that the spent fluid will become fully depressurized before it enters into the ambient atmosphere, but which also will muffle the objectionable noises.
  • An additional object of the invention is to provide such an auxiliary muffle which guides the exiting spent fluid in a desired direction.
  • a pneumatic tool in a combination which briefly stated comprises a housing having a curved portion provided with outlet openings for spent pneumatic fluid, and an auxiliary muffler for the tool.
  • the muffler includes a curved body dimensioned to embrace the curved portion and being provided with at least one channel overlying at least some of the openings and having an end portion provided with discharge apertures.
  • the channel substantially follows the curvature of the curved portion and has a length which corresponds with at least half the length of the curvature of the curved portion.
  • the channel is formed as a groove-shaped recess in an inner surface of the muffler which faces the outer surface of the housing wherein the outlet openings are provided.
  • the muffler may have a strip-shaped portion which is arcuately curved and on the inner surface of which there is mounted a strip-like formed or shaped component of soft or foam material, particularly rubher, that is a material which is resiliently displaceable. This component is bonded or otherwise secured to this inner surface and defines the lateral walls of the channel.
  • FIG. 1 is a side view of a manually held grinding machine of pneumatic type, provided with an auxiliary muffler according to the present invention
  • FIG. 2 is a section taken on line II-II of FIG. 1, on a somewhat enlarged scale and in diagrammatic form;
  • FIG. 3 is a developed view of the interior of the muffler.
  • FIG. 4 is a view similar to FIG. 3 but illustrating an additional embodiment of the invention.
  • FIG. 1 shows a pneumatically operated manually held grinding machine.
  • the particular construction and operation of such pneumatic tools if of no consequence here, because such tools are well known to those skilled in the art and the particular construction of the tool itself forms no part of the invention.
  • the tool has a housing portion I accommodating a drive motor 8 which is shown only diagrammatically and which is a pneumatic drive for driving the tool.
  • a front housing portion 2 is provided, from which a grinding spindle 3 extends which is provided at its free end with a mounting device 4 for mounting a non-illustrated grinding disk.
  • the rear end of the housing is configurated as a hand grip portion 5 having a connecting nipple 6 for a non-illustrated conduit through which pneumatic fluid is to be supplied to the motor 8.
  • a switch or lever 7 is provided on the hand grip portion 5, for the purpose of opening or closing a valve accommodated in the portion 5 (but not shown) which controls the supply of pneumatic fluid from the nipple 6 to the motor 8.
  • the housing portion 1 Adjacent the end of the housing portion 1 which merges into the housing portion 2, the housing portion 1 is provided with a plurality of outlet openings 9 through which the spent pneumatic fluid issuing from the motor 8 can vent into the ambient atmosphere.
  • the openings 9 are arranged in form of three parallel rows each having 10 of the outlet openings.
  • the housing portion 1 is arcuately curved where the openings 9 are provided.
  • An auxiliary muffler 10 is provided, straddling the housing portion 1 over the surface area thereof which is provided with the outlet openings 9. It has an arcuately curved sheet metal strip 11 which is held in the position illustrated in FIG. 2 by having two end portions 12 bent at an angle and having one or more screws 13 (only one shown) extend through the portions 12, or rather through openings provided in them.
  • the inner surface of the strip which faces the outer surface of the housing portion 1 is provided in the illustrated embodiment with two parallel air channels 14, which are separated from one another by a divider wall 16. Approximately midway intermediate the opposite ends of the wall 16 the latter is provided with an opening 17 through which the two channels 14 and 15 communicate with one another.
  • the channels 14 and 15 are formed in that the inner surface of the strip 11 has bonded or otherwise secured to it a strip-like shaped component 18 which in the illustrated embodiment is of soft rubber but could be of synthetic plastic material or the like.
  • the channels 14 and 15 are formed in form of recesses or grooves in the component 18.
  • the open sides of the channels 14 and 15 face toward and are covered by the outer surface of the housing portion 1, when the muffler 10 is in the position illustrated in FIG. 2.
  • the channels 14 and 15 are completely closed at all sides.
  • the developed length of the channels corresponds in the illustrated embodiment to approximately 75% of the circumferential length of the housing portion 1 where the same is embraced or straddled by the muffler 10, as shown in FIG. 2.
  • the muffler 10 is so connected with the housing portion 1 that one end of the channel 15 overlies the openings 9 which are illustrated in form of the chain-like boxes 9 in FIGS. 1 and 3.
  • the other end of the channel 14, which extends in parallelism with the channel 15, is provided with discharge openings 19 which are formed in the strip 11.
  • the openings 19 correspond to the openings 9.
  • an airflow path 20 which is shown in chain lines in FIG. 3 is thus obtained. This is a relatively long path for the air to traverse as it passes through the channels 15 and 14, so that the air exiting through the outlet openings 9 can become completely depressurized before it is finally vented to the ambient atmosphere through the openings 19.-
  • the muffler 10 can accommodate itself to the contour of the outer surface of the housing portion 1, which may for instance be grooved or otherwise textured rather than smooth. This affords a particularly good sealing of the channels 14, 15 with respect to the ambient atmosphere at all points except where a communication is intended, namely through the openings 19. On the other hand, this type of sealing contact between the housing portion 1 and the muffler l0 prevents the transmission of resonance from the housing into the muffler 10.
  • FIG. 4 is analogous to that illus- I trated in FIGS. l-3, from which it differs in that air channels 21 and 22 are configurated differently. In all other respects the embodiment of FIGS. 1-3 is the same as that of FIG. 4, so that the latter need not be discussed in any greater detail, being self-evident.
  • the air channel could be configurated differently from what has been shown in FIGS. 1-3 on the one hand, and in FIG. 4 on the other hand, for instance depending upon the particular type of pneumatic tool with which the muffler is to be used.
  • the muffler 10 itself may also be made as a shaped component of synthetic plastic material. It may be made in. its entirety of an elastically yieldable material, of for instance a cellular material of rubber or synthetic plastic. However, it is also possible to provide only the surface areas of the muffler 10 which come in contact with the housing portion 1 of the tool with an elastically yieldable material which can accommodate itself to the exterior surface contour of the housing portion l.v
  • a combination comprising a housing having an axis and including a curved portion having an external surface and provided with outlet openings for spent pneumatic fluid; and a muffler including a curved body dimensioned to embrace said curved portion and comprising a curved strip of sheet metal having an internal surface facing said external surface and defining therewith an annular clearance extending axially of said housing, and at least one shaped member of elastically yieldable' foamed synthetic plastic material located in said clearance and interposed between and in contact with said surfaces and defining therewith at least one enclosed tortuous channel for the passage of the spent fluid therethrough, said surfaces bounding said channel in the radially inward and outward directions, and said shaped member having first portions extending in said clearance at circumferentially spacedlocations in axial directionsofsaid housing, axially spaced curvedsectionportions connecting respective ends of said first portion's,'and' third portions extending intermediate said first portions away from the respective second portions towards but short of one another so as to define

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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)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
US391289A 1972-09-28 1973-08-24 Pneumatic tool construction Expired - Lifetime US3891049A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE7235753 1972-09-28

Publications (1)

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US3891049A true US3891049A (en) 1975-06-24

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US391289A Expired - Lifetime US3891049A (en) 1972-09-28 1973-08-24 Pneumatic tool construction

Country Status (5)

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US (1) US3891049A (it)
JP (1) JPS4971568A (it)
FR (1) FR2201712A5 (it)
GB (1) GB1445004A (it)
IT (1) IT995519B (it)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4244442A (en) * 1978-10-13 1981-01-13 Rensselaer Polytechnic Institute Method and apparatus for treating exhaust gases particularly for air-operated tools
US4327817A (en) * 1978-10-13 1982-05-04 Rensselaer Polytechnic Institute Method and apparatus for treating exhaust gases particularly for air-operated tools
US5581055A (en) * 1995-08-04 1996-12-03 Kevin G. Self Muffler for air operated hand tools and other pneumatic devices
WO2002078911A1 (en) * 2001-03-29 2002-10-10 Snap-On Technologies, Inc. Pneumatic tool with muffler bypass mechanism
US7238095B1 (en) * 2006-11-20 2007-07-03 Storm Pneumtic Tool Co., Ltd. Pneumatic grinder with improved muffling structure
US7341173B1 (en) * 2006-10-05 2008-03-11 Arnold John L Exhaust gas diffuser and filter system for a pneumatic nail gun
KR20190056770A (ko) 2017-11-17 2019-05-27 현대자동차주식회사 소음기 내부구조파이프에 설치되는 파이프고정용 클램프의 설치구조
CN110480469A (zh) * 2019-08-30 2019-11-22 天津信强橡塑有限公司 橡胶密封条在线背胶系统
US11867102B2 (en) 2019-08-28 2024-01-09 Snap-On Incorporated Pneumatic tool exhaust muffler

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138728B (en) * 1983-04-22 1986-07-23 Inst Gornogo Dela Sibirskogo O Pneumatic impact tool

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2128742A (en) * 1937-04-09 1938-08-30 Ingersoll Rand Co Muffling device
US2815088A (en) * 1955-12-21 1957-12-03 Stephen J Gibel Muffler
US2949975A (en) * 1957-10-17 1960-08-23 Walter A Plummer Pneumatic tool muffle
US3202239A (en) * 1963-06-10 1965-08-24 Clarke Ronald Albert William Acoustic shield for a tool powered by a gas-operated motor
US3225861A (en) * 1963-09-13 1965-12-28 Cons Mining & Smelting Co Sound suppressing device comprising elastic tubular sleeve for air actuated percussive type tools
US3263770A (en) * 1964-10-19 1966-08-02 Atlas Copco Ab Noise deadening means for percussive tools
US3365022A (en) * 1965-12-20 1968-01-23 Holman Brothers Ltd Silencing means for percussive pneumatic tools
US3379278A (en) * 1967-01-19 1968-04-23 Skowron Carl Muffler for pneumatically powered tools
US3459275A (en) * 1968-08-05 1969-08-05 Niles Pressluftwerkzeuge Veb Soundproof compressed-air machine
US3635299A (en) * 1970-04-20 1972-01-18 Gardner Denver Co Muffler for pneumatic tool
US3662855A (en) * 1970-05-04 1972-05-16 Robert D Adams Muffled tool for vibratory or impact machines

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2128742A (en) * 1937-04-09 1938-08-30 Ingersoll Rand Co Muffling device
US2815088A (en) * 1955-12-21 1957-12-03 Stephen J Gibel Muffler
US2949975A (en) * 1957-10-17 1960-08-23 Walter A Plummer Pneumatic tool muffle
US3202239A (en) * 1963-06-10 1965-08-24 Clarke Ronald Albert William Acoustic shield for a tool powered by a gas-operated motor
US3225861A (en) * 1963-09-13 1965-12-28 Cons Mining & Smelting Co Sound suppressing device comprising elastic tubular sleeve for air actuated percussive type tools
US3263770A (en) * 1964-10-19 1966-08-02 Atlas Copco Ab Noise deadening means for percussive tools
US3365022A (en) * 1965-12-20 1968-01-23 Holman Brothers Ltd Silencing means for percussive pneumatic tools
US3379278A (en) * 1967-01-19 1968-04-23 Skowron Carl Muffler for pneumatically powered tools
US3459275A (en) * 1968-08-05 1969-08-05 Niles Pressluftwerkzeuge Veb Soundproof compressed-air machine
US3635299A (en) * 1970-04-20 1972-01-18 Gardner Denver Co Muffler for pneumatic tool
US3662855A (en) * 1970-05-04 1972-05-16 Robert D Adams Muffled tool for vibratory or impact machines

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4244442A (en) * 1978-10-13 1981-01-13 Rensselaer Polytechnic Institute Method and apparatus for treating exhaust gases particularly for air-operated tools
US4327817A (en) * 1978-10-13 1982-05-04 Rensselaer Polytechnic Institute Method and apparatus for treating exhaust gases particularly for air-operated tools
US5581055A (en) * 1995-08-04 1996-12-03 Kevin G. Self Muffler for air operated hand tools and other pneumatic devices
WO2002078911A1 (en) * 2001-03-29 2002-10-10 Snap-On Technologies, Inc. Pneumatic tool with muffler bypass mechanism
US6530436B2 (en) * 2001-03-29 2003-03-11 Snap-On Technologies, Inc. Pneumatic tool with muffler bypass mechanism
CN1309533C (zh) * 2001-03-29 2007-04-11 斯耐普昂技术公司 带有消声器旁通机构的气动工具
US7341173B1 (en) * 2006-10-05 2008-03-11 Arnold John L Exhaust gas diffuser and filter system for a pneumatic nail gun
US7238095B1 (en) * 2006-11-20 2007-07-03 Storm Pneumtic Tool Co., Ltd. Pneumatic grinder with improved muffling structure
KR20190056770A (ko) 2017-11-17 2019-05-27 현대자동차주식회사 소음기 내부구조파이프에 설치되는 파이프고정용 클램프의 설치구조
US11353149B2 (en) 2017-11-17 2022-06-07 Hyundai Motor Company Structure for installing pipe fixing clamp installed in internal structural pipe of sound absorber
US11867102B2 (en) 2019-08-28 2024-01-09 Snap-On Incorporated Pneumatic tool exhaust muffler
CN110480469A (zh) * 2019-08-30 2019-11-22 天津信强橡塑有限公司 橡胶密封条在线背胶系统

Also Published As

Publication number Publication date
GB1445004A (en) 1976-08-04
IT995519B (it) 1975-11-20
JPS4971568A (it) 1974-07-10
FR2201712A5 (it) 1974-04-26

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