US3757875A - Air hammer and combined support and muffler therefor - Google Patents

Air hammer and combined support and muffler therefor Download PDF

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Publication number
US3757875A
US3757875A US00201933A US3757875DA US3757875A US 3757875 A US3757875 A US 3757875A US 00201933 A US00201933 A US 00201933A US 3757875D A US3757875D A US 3757875DA US 3757875 A US3757875 A US 3757875A
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US
United States
Prior art keywords
plates
housing
rigid
movable support
support
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
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US00201933A
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English (en)
Inventor
S Gunning
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.)
KENT AIR TOOL Co
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KENT AIR TOOL Co
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 KENT AIR TOOL Co filed Critical KENT AIR TOOL Co
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Publication of US3757875A publication Critical patent/US3757875A/en
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Classifications

    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
    • E02F3/966—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements of hammer-type tools
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S173/00—Tool driving or impacting
    • Y10S173/02—Sound muffling

Definitions

  • Air hammers of the general type herein described are well known in the art, the one shown for illustration in the present application being that disclosed in my copending application, Ser. No. 10,826, filed Feb. 12, 1970, entitled Air Hammer and issued as United States Letters Pat. No. 3,625,295 on Dec. 7, 1971.
  • the hammer comprises an elongated body or barrel which is disposed between and connected at its rear end in fixed relation to a pair of laterally spaced supporting plates.
  • the plates are pivotally connected to the bucket supporting arm of a conventional power shovel so that the hammer can be moved bodily with the arm and rocked about a horizontal axis to different operating positions relative to the arm.
  • the same plates are pivotally connected to the piston and cylinder assemblage which is provided for operating the bucket.
  • the air ham'mer can be directed at different angles to the arm, selectively, and held at the selected angle during operation.
  • This hammer, and other hammers of this general type exhaust the air percussively directly to the atmosphere with the result that the exhaust creates a very loud and ir ritating noise.
  • Mufflers of some types have been used to reduce the noise thus created, but have not proven as satisfactory as desired.
  • the present invention is directed to the muffling of the percussively discharged air so as to reduce noise greatly. More specifically it is directed to the use of the therein, part thereof being broken away for elearncss in illustration;
  • FIG. 3 is a side elevation of the structure illustrate in FIG. 2, part thereof being shown in section;
  • FIG. 4 is a fragmentary front end elevation of the structure illustrated in FIG. 1;
  • FIG. 5 is a fragmentary cross sectional view of the structure illustrated in FIGS. I and 2, and is taken on the line 55 thereof;
  • FIG. 6 is a fragmentary cross sectional view of the structure illustrated in FIGS. 1 and 2 and is taken on the line 66 thereof;
  • FIG. 7 is a fragmentary rear end elevation of the structure illustrated in FIGS. 1 and 2.
  • the present invention is shown as supported on the bucket supporting arm A of a boom B of a conventional power shovel for rocking to different selected operating positions by a piston and side supportingplates for the hammer'as a structural part of the muffler. This is accomplished by extending the supporting plates to a location near the front of the hammer and securing them thereto near the forward end as well as the rear end, thus greatly increasing the rigidity of the support.
  • The, space between the plates is closed at the top and bottom of the plates to provide an enclosing muffling housing into which the exhaust air is discharged and through which it is constrained to flow in a tortuous baffled path so as to discharge near the rear of the hammer with a greatly reduced percussiveness.
  • FIG. 1 is a perspective view of the combined support and muffler of the present invention, with the. hammer supported thereby and with the muffler, in turn, supported on the bucket supporting arm of a conventional power shovel;
  • FIG. 2 is an enlarged top plan view of the combined support and muffler with the air hammer mounted cylinder assemblage C of the power shovel which conventionally is connected to the bucket.
  • the hammer has a body 1 comprising a barrel 2 which is closed at the front end by a suitable header or block 3 with a tool supporting extension 30, and a cylindrical cover 3b. At the rear end the barrel 2 is closed by a header or block 4. The barrel 2 is secured fixedly between the blocks 3 and 4 by tie rods 5. Air under pressure for operating the hammer is admitted through a suitable hose through the rear block 4. Near its forward end the body 1 has an exhaust port 7 which, in the structure shown, is in the block 3'and opens through the cover 3b and exhausts directly into the atmosphere. A tool 8 is carried by the extension 3a of the body 1 and is operated by the air driven mechanism within the body in the conventional fashion.
  • the interior operating parts of the hammer are fully disclosed in my identified patent and, not being a part of the present invention, are not specifically illustrated herein.
  • the body 1 is supported between two rigid upright side plates 10.
  • the plates 10 have means for pivotal connection to the arm A for rocking relative thereto about a horizontal pivotal axis and have means for connection to the piston rod of the piston and cylinder assemblage C so that the plates can be rocked as a unit about the horizontal pivotal axis to different positions.
  • the means for connecting the plates to the arm A comprise ,a pair of aligned coaxial bores 11 in the plates and which are adapted to receive a pivot 12 usually provided for pivotally mounting the bucket.1
  • the means for connecting the plates to the assemblage are aligned coaxial bores 13 adapted to be pivotally connectedby a pivot 14 to a multiplying linkage D which is driven by the piston and cylinder assemblage C normally for rocking the bucket about the axis of the pivot 12.
  • the plates 10 are connected in firm face to face juxtaposition with opposite side faces of the mounting block 4 of the air hammer by suitable tie bolts 16 so as to hold the block, and thereby the hammer body 1 in its entirety, in fixed position relative to the plates 10.
  • the structure thus far described is that of my above identified patent.
  • the plates 10 are extended forwardly from the block 4 beyond the front block 3 and extension 3a, almost to the forward end of the air hammer body 1, as distinguished from my prior hammer in which the side plates terminated forwardly. at the forward face of the block 4.
  • rigid clamping blocks 17 are disposed between the plates 10.
  • Each cover 20 bridges across the entire space between the plates 10 and is secured in fixed position relative to the plates 10 by means of bolts 21 threadably engaged with suitable lugs 22 secured to the inner faces of the plates 10.
  • Each cover 20 has an integral depending flange portion 23 at its forward end. The flange portion 23 extends toward the axis of the body 1 and terminates substantially at a horizontal diametral plane through the axis so as to surround the body with slight radial clearance and substantially close the front end of the resultant housing provided by the side plates land the covers 20.
  • a suitable soft or resilient foamed rubber or elastomeric gasket 24 is provided on the inner face of each depending flange portion 23.
  • the gasket 24 is such as to bridge the clearance space between the inner peripheral edges of the flange portions 23 and the outer peripheral surface of the extension 3a of the body 1.
  • each cover 20 has a flange portion 26, offset outwardly from its normal plane, which is positioned in outwardly spaced relation from the corresponding top or bottom edge face of the block 4.
  • Suitable spacers 27 are disposed between the flange 26 and the adjacent edge face of the block 4 for assuring the spacing of the flange 26 from the face of the block 4 at all times.
  • the covers 20 and the side plates are in spaced relation to the peripheral wall of the body 1 from a position forwardly of the exhaust port 7 to a position near the forward face of the block.
  • the flanges 26 are also spaced from the block 4 and define with the top and bottom edge faces of the block 4 air discharge openings 29.
  • the openings 29 are conneted with the space defined by the covers 20 and side walls 10 on the one hand and the peripheral exterior wall of the body 1 on the other, so that the exhaust air percussively issuing from the port 7.is discharged through the housing passage and the openings 29 into the atmosphere at the rear of the body.
  • baffles 30 are provided within the exhaust air passage in the housing at a location between the exhaust port 7 and the exhaust openings 29.
  • baffle 30 is shown for purposes of illustration, and comprises a metal plate 31 having a central passage 32 which accommodates the body 1 of the hammer with slight radial clearance.
  • a resilient gasket or sealing pad 33 Secured in overlying relation to one side of the plate 31 is a resilient gasket or sealing pad 33, which may be foamed rubber.
  • the pad 33 has a central opening 34 which is sufficient to bridge the clearance space between the edge wall defining the passage 32' and the exterior peripheral wall of the body 1, thus providing an effective seal therebetween and preventing vibrations of the body 1 from being transmitted to the plate 31.
  • the plate 31 extends entirely across the space between the two side plates 10, but is ofless height than the distance between the inner faces of the covers 20 thereby providing restricted passages 35 past the baffle 30 at its top and bottom. As a result, the air from the exhaust port 7 is discharged into a large exhaust passage in which a large volume of air dampensits immediate percussive shock.
  • the air then flows at a relatively high speed and at a more nearly uniform velocity through the restricted passage 35, which further dampens the percussive effects, and then again expands, thus further reducing the percussive and pulsating effect. Finally the air is discharged at relatively high speed and at a still more nearly uniform flow through the restricted openings 29, being reduced to pulsations which cause much less noise than the staccato bark which would be caused were the air discharged from the port 7 directly into the atmosphere.
  • plates 37 are provided for securing the side plates 10 and covers 20 fixedly at positions relative to the midportion of the hammer body and for supporting the. baffle 30, plates 37 are provided. These plates 37 are juxtaposed against the inner faces of the side plates 10 at their outer faces and have concavities 38 at their inner faces, the walls of which firmly embrace the outer peripheral wall of the barrel 2. They may be welded to the barrel, if desired. In the form shown, the plates 37 are held in firm clamping engagement with the barrel 2 and with the side plates 10 by means of suitable tie bolts 39. 1
  • the baffle 30 is disposed so that the lateral edges of the pad 33 is disposed against the forwardly facing edges of the baffle supporting plates 37. Accordingly, the pad 33 is held firmly in place by compression at its lateral edges between the metal plate 31 and forwardly facing edges of the plates 37.
  • cams 40 are provided on the covers and arranged with the cam surfaces sloping inwardly of the body 1 in a direction toward the front of the body so that, as the covers are drawn firmly in place by the bolts 21, the cams engage the plate 31 of the baffle 30 and center it and urge it firmly against its resilient foam rubber padv 33.
  • An air hammer including a rigid body having an exhaust port and adapted to support a tool at one end; a rigid elongated hollow muffler housing enclosing said body from a location near said one end of the body to a location near the other end of the body and secured to the body in fixed position relative thereto, and having a discharge opening spaced from said port; the peripheral wall of said housing being spaced from the body so as to provide an exhaust passage therebetween and affording communication between the opening and the port; means constraining the air discharged from the port to discharge through the opening; first connecting means on and rigid with the housing at said other endof the body and adapted for pivotally connecting the housing to a power driven movable support for rocking of the housing in a fixed path about a predetermined axis extending transversely of the.
  • said housing being sufficiently rigid and strong to blast of the air discharged from said port before the air reaches said discharge opening.
  • baffle means comprise a sheet of metal extending transversely of, and surrounding, the body at a predetermined location, and blocking the major portion of the cross section of said passage at said location, and having an outer peripheral edge portion spaced from the wall of the housing and providing a passage between said edge portion and said wall.
  • the housing has side walls which are rigid supporting plates, respectively,-and each of which is connected at its opposite ends to the opposite ends of the body for supporting the body by, and in fixed relation to, the plates;
  • a movable support is pivotally connected to the plates by said first connecting means
  • power driven means are carried by the movable support and are pivotally connected to the plates by said second connecting means;
  • said plates are disposed at opposite sides of the body
  • the muffler housing includes two strong rigid working load forces transmitting supporting plates disposed at opposite sides of the body, respectively; each plate is rigidly connected to the body near opposite ends of the body, respectively;
  • said first connecting means are on, and rigid with said plates; and said second connecting means are on and rigid with said plates.
  • the muffler housing includes two rigid, heavy working load force transmitting and supporting plates extending alongside opposite sides of the body from said block toward said one end of the body;
  • the muffler housing is rigidly fixedly connected to the body at the opposite ends of the body, respectively, and supports the body;
  • the first connecting means secures one end of the housing to the movable support and supports the housing for movement with the movable support, and for rocking relative to the movable support about the pivotal axis to different working positions relative to the movable support; whereby the working forces applied by the support to the tool is transmitted through the housing from one end of the body to the other end of the body without subjecting the body between its ends to said forces;
  • power means' are mounted on the movable support and connected to the housing so as to be operable to manipulate the housing and thereby the hammer, to different positions relative to the power driven movable support and against the work with working force.
  • a pneumatic hammer including an elongated rigid body adapted to support a tool at one end;
  • each plate fixedly to the body at the opposite ends of the body, respectively;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Working Measures On Existing Buildindgs (AREA)
US00201933A 1971-11-24 1971-11-24 Air hammer and combined support and muffler therefor Expired - Lifetime US3757875A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20193371A 1971-11-24 1971-11-24

Publications (1)

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US3757875A true US3757875A (en) 1973-09-11

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US00201933A Expired - Lifetime US3757875A (en) 1971-11-24 1971-11-24 Air hammer and combined support and muffler therefor

Country Status (5)

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US (1) US3757875A (enrdf_load_stackoverflow)
JP (1) JPS5315442B2 (enrdf_load_stackoverflow)
CA (1) CA949407A (enrdf_load_stackoverflow)
FR (1) FR2162977A5 (enrdf_load_stackoverflow)
GB (1) GB1381329A (enrdf_load_stackoverflow)

Cited By (17)

* 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
US4084645A (en) * 1976-12-09 1978-04-18 Evans Rotork, Inc. Apparatus for securing T-edging and similar edging bands
US4087010A (en) * 1977-01-31 1978-05-02 Stormon Harry J Apparatus for mounting a hand-held paving breaker on backhoe attachments
US4404799A (en) * 1973-05-14 1983-09-20 Thor Power Tool Company Pneumatic tool with muffler
US4624339A (en) * 1983-11-10 1986-11-25 Charbonnages De France Sound-proofing casing for a pneumatic percussive drill
US4889192A (en) * 1988-11-08 1989-12-26 Sylvio Ricard Tractor-controlled hammer assembly
US5419404A (en) * 1990-05-23 1995-05-30 Bretec Oy Hydraulic impact hammer
ES2077485A2 (es) * 1991-07-11 1995-11-16 Ingemas S A Mecanismo de empuje suplementario para martillos de percusion.
US5810101A (en) * 1996-09-11 1998-09-22 Engineering Crossing Systems, (Partnership) Horizontal drilling machine
US6227307B1 (en) * 1998-12-04 2001-05-08 Daemo Engineering Co., Ltd Sound and dust proof breaker
US20040040726A1 (en) * 2002-08-28 2004-03-04 Foltz Mark S. Hammer mounting apparatus
USD645480S1 (en) * 2009-11-23 2011-09-20 Caterpillar Inc. Hammer
USD645481S1 (en) * 2009-11-23 2011-09-20 Caterpillar Inc. Hammer
US20120145426A1 (en) * 2010-12-14 2012-06-14 Caterpillar Inc. Lower damper for demolition hammer
US20130300181A1 (en) * 2010-11-03 2013-11-14 Brokk Aktiebolag Demolition hammer arrangement for a remote-controlled working machine equipped with a manoeuvrable arm
US20180126536A1 (en) * 2016-11-08 2018-05-10 Caterpillar Inc. Hammer sideplate tightening mechanism
GB2555306B (en) * 2015-06-01 2019-12-04 Mountt&C Holdings Ltd Hydraulic breaker, in particular for an excavator

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4993903U (enrdf_load_stackoverflow) * 1972-12-06 1974-08-14
JPS5335524Y2 (enrdf_load_stackoverflow) * 1973-02-12 1978-08-31
JPS5751814Y2 (enrdf_load_stackoverflow) * 1979-07-25 1982-11-11
GB2139938B (en) * 1983-03-31 1987-02-04 Daly Limited P N Improvements in or relating to methods and apparatus for pipe replacement and boring
FI83691C (fi) * 1986-05-09 1991-08-12 Tampella Oy Ab Stoedanordning foer nackstycket i en borrmaskin.
FI78342C (fi) * 1986-05-09 1989-07-10 Tampella Oy Ab Ramkonstruktion foer en borrmaskin.

Citations (4)

* 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
US3223181A (en) * 1962-03-27 1965-12-14 Vernon L Price Vibrationless air hammer assembly
US3599756A (en) * 1969-09-02 1971-08-17 Worthington Corp Rock drill feed mast with integral muffler and oil separator
US3667571A (en) * 1970-11-06 1972-06-06 Robert Fattelay Sound-insulating device for noisy apparatus

Patent Citations (4)

* 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
US3223181A (en) * 1962-03-27 1965-12-14 Vernon L Price Vibrationless air hammer assembly
US3599756A (en) * 1969-09-02 1971-08-17 Worthington Corp Rock drill feed mast with integral muffler and oil separator
US3667571A (en) * 1970-11-06 1972-06-06 Robert Fattelay Sound-insulating device for noisy apparatus

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4404799A (en) * 1973-05-14 1983-09-20 Thor Power Tool Company Pneumatic tool with muffler
US4018291A (en) * 1974-12-23 1977-04-19 Allied Steel & Tractor Products, Incorporated Pneumatic hammer
US4084645A (en) * 1976-12-09 1978-04-18 Evans Rotork, Inc. Apparatus for securing T-edging and similar edging bands
US4087010A (en) * 1977-01-31 1978-05-02 Stormon Harry J Apparatus for mounting a hand-held paving breaker on backhoe attachments
US4624339A (en) * 1983-11-10 1986-11-25 Charbonnages De France Sound-proofing casing for a pneumatic percussive drill
US4889192A (en) * 1988-11-08 1989-12-26 Sylvio Ricard Tractor-controlled hammer assembly
US5419404A (en) * 1990-05-23 1995-05-30 Bretec Oy Hydraulic impact hammer
ES2077485A2 (es) * 1991-07-11 1995-11-16 Ingemas S A Mecanismo de empuje suplementario para martillos de percusion.
US5810101A (en) * 1996-09-11 1998-09-22 Engineering Crossing Systems, (Partnership) Horizontal drilling machine
US6227307B1 (en) * 1998-12-04 2001-05-08 Daemo Engineering Co., Ltd Sound and dust proof breaker
US20040040726A1 (en) * 2002-08-28 2004-03-04 Foltz Mark S. Hammer mounting apparatus
US6802377B2 (en) * 2002-08-28 2004-10-12 Mark S. Foltz Hammer mounting apparatus
USD645480S1 (en) * 2009-11-23 2011-09-20 Caterpillar Inc. Hammer
USD645481S1 (en) * 2009-11-23 2011-09-20 Caterpillar Inc. Hammer
US20130300181A1 (en) * 2010-11-03 2013-11-14 Brokk Aktiebolag Demolition hammer arrangement for a remote-controlled working machine equipped with a manoeuvrable arm
US9086241B2 (en) * 2010-11-03 2015-07-21 Brokk Aktiebolag Demolition hammer arrangement for a remote-controlled working machine equipped with a manoeuvrable arm
US20120145426A1 (en) * 2010-12-14 2012-06-14 Caterpillar Inc. Lower damper for demolition hammer
US8708061B2 (en) * 2010-12-14 2014-04-29 Caterpillar Inc. Lower damper for demolition hammer
GB2555306B (en) * 2015-06-01 2019-12-04 Mountt&C Holdings Ltd Hydraulic breaker, in particular for an excavator
US20180126536A1 (en) * 2016-11-08 2018-05-10 Caterpillar Inc. Hammer sideplate tightening mechanism
US10377029B2 (en) * 2016-11-08 2019-08-13 Caterpillar Inc. Hammer sideplate tightening mechanism

Also Published As

Publication number Publication date
FR2162977A5 (enrdf_load_stackoverflow) 1973-07-20
JPS5315442B2 (enrdf_load_stackoverflow) 1978-05-25
JPS4863505A (enrdf_load_stackoverflow) 1973-09-04
GB1381329A (en) 1975-01-22
CA949407A (en) 1974-06-18

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