US3245483A - Pneumatic impact tool - Google Patents

Pneumatic impact tool Download PDF

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Publication number
US3245483A
US3245483A US222885A US22288562A US3245483A US 3245483 A US3245483 A US 3245483A US 222885 A US222885 A US 222885A US 22288562 A US22288562 A US 22288562A US 3245483 A US3245483 A US 3245483A
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US
United States
Prior art keywords
barrel
chamber
rear end
groove
valve
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
US222885A
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English (en)
Inventor
Elmer F Etzkorn
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.)
Skil Corp
Original Assignee
Skil Corp
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
Priority to NL288658D priority Critical patent/NL288658A/xx
Priority to BE637015D priority patent/BE637015A/xx
Application filed by Skil Corp filed Critical Skil Corp
Priority to US222885A priority patent/US3245483A/en
Priority to GB47239/62A priority patent/GB1005018A/en
Priority to GB10664/64A priority patent/GB1005019A/en
Priority to CH1060263A priority patent/CH435161A/de
Priority to DES87076A priority patent/DE1277770B/de
Application granted granted Critical
Publication of US3245483A publication Critical patent/US3245483A/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
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/14—Control devices for the reciprocating piston
    • 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
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit

Definitions

  • the present invention relates to a hand operable power tool and, more particularly, to a pneumatically actuated impact tool.
  • An important object of the present invention is to provide a new and improved pneumatic impact tool of the type which includes a barrel portion having a chamber therein and a striker member which is pneumatically reciprocated in the barrel chamber to deliver -impact blows to the shank end of a tool which is slidably mounted in the forward end of the barrel.
  • Another important object of the present invention is to provide a new and improved pneumatic impact tool of the character described wherein the barrel is provided with suitable exhaust port means and wherein an airdiverting member, which is disposed in the rear of the barrel chamber i-n communication with both the forward and rear ends thereof, is provided for automatically directing air under pressure first into the rear end of the barrel chamber for propelling the striker member :forwardly therein and then into the forward end of the barrel chamber for propelling the striker member rearwardly therein.
  • a more detailed lobject of the present invention is to provide a new and improved pneumatic impact tool of Ithe character described wherein the air-diverting member is disposed in a transverse groove formed in a valve block which is mounted in the rear end of the barrel, which airdiverting member is disposed between two air passages which are directed, respectively, into the rear end of the barrel chamber and into the forward end of the barrel chamber, and wherein Igenerally radial slots formed in .the rear end of the barrel are provided to direct air under pressure Ifrom a pressure source to the -groove in which the air-diverting member is disposed.
  • a yet fur-ther object of the present invention is to provide new and improved air-diverting valve, which valve is of one piece construction, light in Weigh-t, and inexpensive to manufacture, and which valve is quickly responsive to changes in air pressure and less apt to stick or oxidize in place during periods of non-use of the impact tool.
  • An even further object of the present invention is to provide a new and improved valve block adapted to receive the air-diverting valve, which valve block is of unitary construction thereby having the attendant advantages of easy and low cost manufacture.
  • FIG. 1 is a central vertical section taken through a pneumatic impact tool embodying the invention
  • FIG. 2 is an enlarged side elevational view of the valve block of FIG. l;
  • FIG. 3 is ⁇ a top plan view thereof
  • FIG. 4 is an enlarged vertical section taken generally on the line 4 4 of FIG. l;
  • FIG. 5 is a perspective View looking toward the front or rear face of the air-diverting valve member of FIG. 1;
  • FIGS. 6, 7 and 8 are generally diagrammatic central vertical sections taken through .the barrel portion of the pneumatic impact tool of FlG. 1 and illustrating the operation thereof with the generally radial slots formed in the rear end of the bar-rel for directing air under pressure r, ICC
  • FIG. 9 is a vertical section taken Vgenerally on the line 9 9 of FIG. 1.
  • a pneumatic impact tool 10 embodying the invention and in the form of a hammer includes a generally hollow handle portion 11 which is provided at its upper end with a transverse socket or recess 12 with only the outer end portion thereof being provided with an internal or fem-ale thread 13.
  • the handle portion 11, which is characterized by an internal chamber 14, is provided at its lower en-d with a standard adapter 15 for connection to a source of air pressure to place the chamber 14 in communication with the source of -air pressure.
  • a ringer-operable plunger valve 17 is mounted in a transverse bore 13 formed in the handle portion 11, which bore 18 is connected to the chamber 14 by a passage 19 .and to the inner end of lthe socket 12 by a passage 20 whereby, when .the plunger valve 17 is actuated, air runder pressure is directed into the inner end of the socket 12.
  • the pneumatic impact tool 1d is further characterized by a barrel 22 mountable in Ithe socket 12 in the handle portion 11 and having a cylindrical barrel chamber 23 for-med therein which is open at the rear end of the barrel 22.
  • the outer surface at the rear end of the barrel 22 is provided with an external or male thread 24 which terminates a short distance forwardly of the rear end of the barrel 22 'for a purpose which will be m-ade cle-ar hereinafter.
  • the Irear end of the barrel 22 is adapted 4to be threadedly tightened into the socket 12 ⁇ formed in the handle portion 11 of the pneumatic impact tool 10 with the rear end surface of the barrel 22 being spaced a subst-antial distance forwardly of the inner end of Ithe socket 12, as illustrated in FIG.
  • the outer surface at the forward end of the barrel 22 is provided with round-bottomed threads 26 for tool .retaining purposes to be described hereinafter.
  • An axial through bore 27 formed in the front end of yt-he barrel 22 and opening into the front end of the barrel chamber 23 is adapted to slidably receive a rearwardly disposed shank portion 28 of an impact tool 29 of knownrtype.
  • a free piston or striker -member 30 is pneumatically reciprocal within the barrel chamber 23, in a manner to be described, for delivering continuous impact blows to the rear end ofthe shank portion 28 of the impact tool 29 as long as the plunger valve 17 is actuated.
  • the barrel 22 is provided with a pair of longitudinally spaced exhaust ports 32 and 33 which exhaust ports 32 and 33 extend through the wall of the barrel 22 from the atmosphere and open into the barrel chamber 23 with the exhaust port 32 being disposed forwardly of the exhaust port 33 for purposes which will be evident hereinafter.
  • a shield or detiector 34 is mounted on the barrel 22 outwardly of the exhaust ports 32 and 33 to deflect the air exhausted therethrough.
  • An air passage 35 extends from the rear end of the barrel 22 into communication with the barrel chamber 23 at the forward end thereof whereby to provide passage means for directing air under pressure into the forward end of the barrel chamber 23.
  • the air passage 35 includes a longitudinally extending blind bore portion 35 which is disposed radially outwardly of the barrel chamber 23 and parallel to the axis thereof.
  • the bore portion 36 is open at the rear end of the barrel 22 and terminates at its inner end at a point which is generally in alignment with the forward end of the barrel chamber 23.
  • the air passage 35 also includes a generally transverse bore portion 37' which extends into the forward portion of the barrel chamber 23 from the inner or forward end of the longitudinally extending bore portion 36. It is noted that the generally transverse bore portion 37 of the air passage 35 and the forwardmost exhaust port 32 are co-axially aligned with a common axis x-x thereof being inclined to the longitudinal axis of the barrel chamber 23 in a manner such that the exhaust port 32 is disposed rearwardly of the generally transverse bore portion 37 of the air passage 35.
  • One novel feature of the present invention is a new and improved method for forming a barrel for a pneumatic impact tool such as the barrel 22 -for the tool 10 of FIG. 1.
  • a generally transverse internal air passage such as the generally transverse bore portion 37 of the air passage 35
  • drill a vhole through the wall of the barrel 22 from the lower surface thereof (as viewed in FIG. 1) through the inner end of the longitudinal bore portion 36 of the air passage 35 and then into the barrel chamber 23.
  • the obvious disadvantages of the foregoing method have been overcome by the novel method which has been developed for forming the generally transverse bore portion 37 of the air passage 35 in the barrel 22 of the pneumatic impact tool of FIG. 1.
  • the generally transverse forwardmost exhaust port 32 is drilled through the wall of the barrel 22 from a point on the periphery of the barrel 22 which is generally diametrically opposite from the forward end of the longitudinal axis of the longitudinal bore portion 36 and on the opposite side of the barrel chamber 23 therefrom with the drilling then being continued throu-gh the barrel chamber 23 and through the inner wall thereof until the inner end of the longitudinal bore portion 36 is intersected whereby to provide the generally transverse bore portion 37 of the air passage 35 which opens into the forward end o-f the barrel chamber 23.
  • the generally transverse bore portion 37 of the air passage 35 is co-axial with the exhaust port 32 with the angle at which Ithese two co-axial bores 37 and 32 are drilled relative 4to the axis of the barrel chamber 23-being chosen so as to ylongitudinally position the inner end of the exhaust port 32 at the proper point on the inner surface of the barrel chamber 23 for pneumatic reciprocal actuation of the striker member 30.
  • a novel valve block and air-diverting valve arrangement is provided.
  • a valve block 40 is mountedy on the barrel 22 at the rear end thereof and is adapted to be received in the space dened between the rear end of the barrel 22 and the inner end of the socket 12.
  • the valve block 40 as illustrated in FIGS. 2 4, is characterized by a rearward portion 42 which is adapted to be fitted against the rear end of the barrel 22 and which has an outer diameter which is slightly less than the bore diameter of the socket 12 at the inner end thereof whereby to define an annular passage 41 which is in communication with the air inlet passage 2t) from the plunger valve 17.
  • the valve block 40 is further characterized by a reduced-in-diameter forward portion 43 which is integral with the rearward portion 42 and which is adapted to be tted in the rear end of the barrel 22 to provide a closure fo-r .the same.
  • a forwardly projecting guide pin 44 which is provided on the front face of the portion 42, is receivable in a mating recess formed in the rear end surface of the barrel 22 whereby to properly angularly position the lvalve block 40 relative to the rear end of the barrel 22.
  • a transversely extending semi-circular slot or groove 46 is formed in the upper half of the forward portion 43 of the valve block 40 a slight distance forwardly of the rearward portion 42 thereof.
  • An air passage 48 extends forwardly from the front face of the groove 46 through the forward portion 43 of the valve block 40 and opens into the rear end of the barrel chamber 23 at 4the front surface of the forward portion 43.
  • An air passage 5i) extends rearwardly from the rear face of the groove 46 and then downwardly and forwardly within the rear portion 42 with the opposite end thereof being open at the front face of the portion 42 of the valve block 40 and aligned for communication with the rear open end of the longitudinal bore portion '36 of the air passage 35 formed in the rear endV surface of the barrel 22.
  • the air passage 5i) is characterized by an upper rearwardly extending portion 50a, by a downwardly extending portion 50b, and by a lower ⁇ forwardly extending portion 50c.
  • the groove 46 is therefore in communication with the forward end of the barrel chamber 23 through lthe air passages 50 and 35 and with the rear end of the barrel chamber 23 through the ⁇ air passage 48.
  • the male or external thread .Z4-on the rear end of the barrel 22 terminates forwardly of the rear end of the barrel 22.
  • the non-threaded rear end peripheral portion of the barrel 22 is slightly less in diameter than 4the bore diameter of the inner end of the socket 12 whereby an annular passage 51 is defined therebetween, which annular passage 51 is in communication open into the groove 46 through the opposite front and Y rear faces thereof.
  • a generally planar or se-mi-disc-like air-diverting valve member 55 is freely disposed in the semi-circular groove 46 formed in the valve block 40 with the thickness of the valve member 55 being less than the width of the groove 46.
  • the valve member 55 is preferably non-ferrous and more preferably formed of a phenolic laminate characterized, for instance, by a canvas or linen base which is impregnated with a phenolic resin.
  • valve 55 from a phenolic laminate, or other suitable non-ferrous material forms an inexpensive and light valve which is quickly responsive to changes in air pressure and vacuum.
  • ferrous valves have been used and they have beenV known to oxidize or rust dueto moisture in the air lines. ⁇
  • ferrous valves frequently rust or freeze in the valve block making the tool inoperative until disassembly of the same and manual freeing of the valve.
  • Reciprocal operation of the striker member 30 may best be described with reference to FIGS. 6, 7 and 8.
  • air under pressure is directed through the passage 48 into the rear end of the barrel chamber 23 to propel the striker member 43 forwardly, with the forward exhaust port 32 being open and the rear exhaust port 33 being closed bythe striker member 30 during the rst portion of the forward movement thereof.
  • the forwardmost exhaust port 32 Prior to the striker member 30 reachingl its forwardmost tool shank impact position, the forwardmost exhaust port 32 is closed by the striker member 30, whereby the air trapped in the forward end of the barrel chamber 23 becomes compressed as a result of the continued forward movement of the striker member 30l under its own momentum.
  • the rearmost exhaust port 33 is open and the pressure increase at the forward end of the barrel chamber 23 which is communicated to the rear face of the valve 55 by means of the passages 35 and 50 in combination with a partial vacuum formed attheI front face of the Valve 55 by the increased iiow of air across the same and out through the port 33 is suicient to shift the valve to its position against the forward face of the groove 46, as illustrated in FIG. 7.
  • the lightness of the air-diverting valve 55 and its resulting lack of inertia permit a more rapid response to these pressure and vacuum effects thereby providing a more positive valve movement which increases the operating eiciency of the impact t-ool.
  • the pneumatic impact tool of this invention also includes a novel tool retainer which is illustrated in FIGS. 1 and 6 through 9.
  • retainers consist of a coil or beehive retainer threadable over the front end of the barrel of an impact tool.
  • the shank portion of a standard working tool is inserted in the barrel of the tool for contact by the striker.
  • the extent to which the shank may be inserted in the tool is controlled by an integral annular shoulder provided on the shank intermediate the ends thereof, which shoulder is adapted to engage the nose of the barrel.
  • the beehive retainer is slid over the working end of the tool and threadingly engaged with the front end of lthe impact tool barrel which is usually provided with a number of threads on the outer surface thereof.
  • the tool retainer of this invention which is adapted to hold a working tool to an impact tool regardless of the size of the working portion of the tool, includes a split collar retainer 60 and la beehive or coil retainer 62.
  • the coil retainer is for-med of a series of interconnected coils 70, and it is generally cylindrical in configuration.
  • the rear end portion of the coil may be threadingly mounted on the forward end of the lbarrel 22 by engagement of the Icoils of the retainer with the round-'bottomed external threads 26 formed on the barrel of the impactv -tool for holding the entire retainer assembly to the impact tool.
  • the forwardmost -coils 72 of the coil retainer 62 progressively decrease in diameter in a forward direction for retaining engagement with the split collar 6G.
  • the forwardmost coils 72 dene an opening 68, which opening is of a diameter large enough to receive an annular shoulder 67 formed on the shank 28 of a working tool 29.
  • the coil retainer therefore, retains only the split collar member 60 in place on the barrel of the tool and not the working tool :itself -as will be shown hereinafter.
  • the split collar retainer is characterized by a generally cylindrical body member 63 having an axially extending opening 64 formed in the wall thereof, with the rear end of the body mem'ber 63 being adapted to -abut the front end surface of the Ibarrel 22.
  • the forward or nose end of the body member is tapered inwardly as at 65 on the outer surface thereof and on the inner surface thereof is Iformed an inwardly extending flange-like portion 66 dening an opening having a diameter less than the diameter of the major portion of the body member 63 and less than the diameter of the shoulder 67 formed on the shank 28 of the working tool.
  • the working tool member 29 is insertedthrough the coi-l retainer 62 before this retainer is attached to the impact tool. If the working portion of the t-ool 29 is too large to pass through the opening 63 in the nose of the coil retainer, the shank 2S of the working tool is passed through the opening 68 from left to right, as shown in the drawings. It will be recalled that this opening 68 has a diameter larger than the diameter of -the annular shoulder 67 on the shank of the working tool.
  • the coil retainer is slid to its forward-most position on the working tool and the split collar retainer 60 is tted downwardly or dropped over the shank of the tool forward of the shoulder 67 thereon.
  • the opening 64 in the split collar has a width greater than the diameter of the -tool shank.
  • the split collar 60 will be received within the coil 62 with the tapered portion 65 of the collar in engagement with the inside of the reduced p0rtion 72 of the coil retainer.
  • the shank 28 of the working tool is then inserted within the bore 27 of the barrel 22 for actuation by the striker 30.
  • the coil retainer with the split collar held therein is threaded over the roundedbottom threads 26 on the barrel 22.
  • the retainer assembly permits limited reciprocal movement of the working tool 29 in a longitudinal direction, but the working tool will be retained to the irnpact tool Iby engagement of the shoulder 67 on the shank of the working tool with the inwardly extending flangelike portion 66 formed on the split collar 60.
  • the split ⁇ collar 60 is, in turn, resiliently held to the barrel 22 by the coil spring retainer 62.
  • the spring 62 is provided at its rear end with ⁇ an outwardly projecting end portion 74 which serves as a manually grippable handle for rotatably mounting the coil retainer 62 ⁇ and the split collar retainer 60 associated therewith on the forward end of the barrel 22.
  • the tool retainer of this invention permits the easy and rapid engagement of a working tool to an impact tool, and it will be apparent that the retainer is adapted to retain working tools in place regardless of the size of the working end of such tools.
  • a pneumatic impact device comprising a barrel having a cylinder-like chamber therein ⁇ and adapted to have the shank of an impact tool slidably inserted into the forward end of the chamber therein, a striker member pneumaticaflly reciprocable within said barrel chamber for imparting impact blows to the end of a tool shank extending into the forward end of same, said lbarrel having a generally longitudinally extending passage with its forward end communicating with the forward end of said barrel chamber, and said barrel having exhaust port means arranged to be opened and closed by the striker member upon reciprocation of the same, the improvement c-omprising, a valve ⁇ block mounted in the rear end of said barrel and characterized Iby a generally cylindrical forward portion fitted within and closing the rear end of said barrel chamber and by an enlarged diameter rear portion fitted against the rear end of said barrel, said valve block having a generally vertically disposed transverse groove Iformed in the upper portion of said -forward portion thereof, which groove cooperates with the inside wall of said barrel to define an enclosed
  • valve member is formed of a phenolic laminate.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling Tools (AREA)
US222885A 1962-09-11 1962-09-11 Pneumatic impact tool Expired - Lifetime US3245483A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
NL288658D NL288658A (ru) 1962-09-11
BE637015D BE637015A (ru) 1962-09-11
US222885A US3245483A (en) 1962-09-11 1962-09-11 Pneumatic impact tool
GB47239/62A GB1005018A (en) 1962-09-11 1962-12-14 Pneumatic impact tool
GB10664/64A GB1005019A (en) 1962-09-11 1962-12-14 Tool retainer
CH1060263A CH435161A (de) 1962-09-11 1963-08-28 Pneumatisches Hämmergerät
DES87076A DE1277770B (de) 1962-09-11 1963-09-04 Pneumatischer Hammer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US222885A US3245483A (en) 1962-09-11 1962-09-11 Pneumatic impact tool

Publications (1)

Publication Number Publication Date
US3245483A true US3245483A (en) 1966-04-12

Family

ID=22834126

Family Applications (1)

Application Number Title Priority Date Filing Date
US222885A Expired - Lifetime US3245483A (en) 1962-09-11 1962-09-11 Pneumatic impact tool

Country Status (6)

Country Link
US (1) US3245483A (ru)
BE (1) BE637015A (ru)
CH (1) CH435161A (ru)
DE (1) DE1277770B (ru)
GB (2) GB1005019A (ru)
NL (1) NL288658A (ru)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3299781A (en) * 1964-12-04 1967-01-24 Ingersoll Rand Co Air inlet and exhaust manifold
US3498186A (en) * 1967-05-19 1970-03-03 Oren Van Northcutt Multiple lobed chamber air motor
US3696709A (en) * 1969-12-04 1972-10-10 Tpi & Co Control device for a reciprocating machine
US4388972A (en) * 1980-04-25 1983-06-21 Atlas Copco Aktiebolag Vibrationless impact tool
US4446773A (en) * 1980-11-07 1984-05-08 Maco-Meuden Compressed air distributor for a reciprocating concrete breaking type machine
CN102069475A (zh) * 2009-11-20 2011-05-25 南京德朔实业有限公司 一种动力榔头
US20120097410A1 (en) * 2010-10-26 2012-04-26 Honsa Thomas W Tool
US9440344B2 (en) 2010-07-08 2016-09-13 Makita Corporation Dust collecting device and impact tool
US20180370007A1 (en) * 2015-12-15 2018-12-27 Hilti Aktiengesellschaft Percussive power tool
US11123853B2 (en) * 2016-08-09 2021-09-21 Hilti Aktiengesellschaft Hand-held power tool
US11602831B1 (en) * 2022-01-21 2023-03-14 Storm Pneumatic Tool Co., Ltd. Air impact tool having improved vibration-damping structure

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU721323A1 (ru) * 1977-12-09 1980-03-15 Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Механизированного И Ручного Строительно- Монтажного Инструмента,Вибраторов И Строительно-Отделочных Машин Устройство дл креплени рабочего инструмента в машинах ударного действи
SE439035B (sv) * 1980-11-27 1985-05-28 Atlas Copco Ab Mejselhallare for slaende maskinverktyg
DE3344503A1 (de) * 1983-12-09 1985-06-20 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Handgefuehrte schlag- oder hammerbohrmaschine
DE102022103591A1 (de) 2022-02-16 2023-08-17 Storm Pneumatic Tool Co., Ltd. Pneumatisches Schlagwerkzeug mit vibrationsdämpfender Struktur

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1485010A (en) * 1919-09-11 1924-02-26 Said Crowe Tool holder for pneumatic hammers
US1796487A (en) * 1928-03-01 1931-03-17 Chicago Pneumatic Tool Co Coil-spring retainer
US2275102A (en) * 1940-08-24 1942-03-03 Flannery Bolt Co Telltale hole opener for staybolts
US2478818A (en) * 1944-03-06 1949-08-09 Hpm Dev Corp Method of manufacturing pressure cylinders
US2500036A (en) * 1945-12-22 1950-03-07 Cleveland Pneumatic Tool Co Cushioned handle for portable percussive tools
US2699153A (en) * 1952-08-29 1955-01-11 Russell Carl Dexter Reversing valve mechanism
US2717613A (en) * 1952-04-25 1955-09-13 Baker Oil Tools Inc Fluid control valve
US2752664A (en) * 1954-02-17 1956-07-03 Lowell N Brown Rotary hand drill
US3086501A (en) * 1959-06-24 1963-04-23 Henry E Kyburg Fluid-operated hammer
US3137483A (en) * 1958-01-24 1964-06-16 Zinkiewicz Wiktor Ground burrowing device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1485010A (en) * 1919-09-11 1924-02-26 Said Crowe Tool holder for pneumatic hammers
US1796487A (en) * 1928-03-01 1931-03-17 Chicago Pneumatic Tool Co Coil-spring retainer
US2275102A (en) * 1940-08-24 1942-03-03 Flannery Bolt Co Telltale hole opener for staybolts
US2478818A (en) * 1944-03-06 1949-08-09 Hpm Dev Corp Method of manufacturing pressure cylinders
US2500036A (en) * 1945-12-22 1950-03-07 Cleveland Pneumatic Tool Co Cushioned handle for portable percussive tools
US2717613A (en) * 1952-04-25 1955-09-13 Baker Oil Tools Inc Fluid control valve
US2699153A (en) * 1952-08-29 1955-01-11 Russell Carl Dexter Reversing valve mechanism
US2752664A (en) * 1954-02-17 1956-07-03 Lowell N Brown Rotary hand drill
US3137483A (en) * 1958-01-24 1964-06-16 Zinkiewicz Wiktor Ground burrowing device
US3086501A (en) * 1959-06-24 1963-04-23 Henry E Kyburg Fluid-operated hammer

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3299781A (en) * 1964-12-04 1967-01-24 Ingersoll Rand Co Air inlet and exhaust manifold
US3498186A (en) * 1967-05-19 1970-03-03 Oren Van Northcutt Multiple lobed chamber air motor
US3696709A (en) * 1969-12-04 1972-10-10 Tpi & Co Control device for a reciprocating machine
US4388972A (en) * 1980-04-25 1983-06-21 Atlas Copco Aktiebolag Vibrationless impact tool
US4446773A (en) * 1980-11-07 1984-05-08 Maco-Meuden Compressed air distributor for a reciprocating concrete breaking type machine
CN102069475B (zh) * 2009-11-20 2013-08-21 南京德朔实业有限公司 一种动力榔头
CN102069475A (zh) * 2009-11-20 2011-05-25 南京德朔实业有限公司 一种动力榔头
US9440344B2 (en) 2010-07-08 2016-09-13 Makita Corporation Dust collecting device and impact tool
EP2789790B1 (en) * 2010-07-08 2016-10-19 Makita Corporation Dust collecting device and impact tool
US10315300B2 (en) 2010-07-08 2019-06-11 Makita Corporation Dust collecting device and impact tool
US20120097410A1 (en) * 2010-10-26 2012-04-26 Honsa Thomas W Tool
US20160332288A1 (en) * 2010-10-26 2016-11-17 Honsa Ergonomic Tech Tool
US20180370007A1 (en) * 2015-12-15 2018-12-27 Hilti Aktiengesellschaft Percussive power tool
US10821589B2 (en) * 2015-12-15 2020-11-03 Hilti Aktiengesellschaft Percussive power tool
US11123853B2 (en) * 2016-08-09 2021-09-21 Hilti Aktiengesellschaft Hand-held power tool
US11602831B1 (en) * 2022-01-21 2023-03-14 Storm Pneumatic Tool Co., Ltd. Air impact tool having improved vibration-damping structure

Also Published As

Publication number Publication date
BE637015A (ru)
NL288658A (ru)
GB1005019A (en) 1965-09-22
DE1277770B (de) 1968-09-12
CH435161A (de) 1967-04-30
GB1005018A (en) 1965-09-22

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