US3735823A - Impact motive implement - Google Patents

Impact motive implement Download PDF

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Publication number
US3735823A
US3735823A US00013522A US3735823DA US3735823A US 3735823 A US3735823 A US 3735823A US 00013522 A US00013522 A US 00013522A US 3735823D A US3735823D A US 3735823DA US 3735823 A US3735823 A US 3735823A
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US
United States
Prior art keywords
piston
cylinder
oil
main valve
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
US00013522A
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English (en)
Inventor
H Nara Terada
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.)
Nippon Pneumatic Manufacturing Co Ltd
Original Assignee
Nippon Pneumatic Manufacturing Co Ltd
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 claimed from JP3849170A external-priority patent/JPS4929801B1/ja
Priority claimed from JP3849070A external-priority patent/JPS501322B1/ja
Application filed by Nippon Pneumatic Manufacturing Co Ltd filed Critical Nippon Pneumatic Manufacturing Co Ltd
Application granted granted Critical
Publication of US3735823A publication Critical patent/US3735823A/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
    • B25D9/06—Means for driving the impulse member
    • B25D9/12—Means for driving the impulse member comprising a built-in liquid motor, i.e. the tool being driven by hydraulic pressure

Definitions

  • ABSTRACT An impact motive implement for a fluid impact tool or the like.
  • the implement has a main body having an upper cylinder and a lower cylinder.
  • An upper piston and a lower piston are fitted into the two cylinders and connected with a piston rod.
  • An impact tool is disposed under the main body against the upper end of which the lower end of the lower piston strikes when the piston are lowered.
  • a main valve opens and I closes an oil inlet port and an oil outlet port leading to the oil chamber in the lower portion within the lower cylinder, and a limiting valve is moved by the upper piston as it rises.
  • the operating portion of the main valve and the limiting valve are correlated so that the main valve will shut off the oil chamber and the oil inlet port and connect the oil chamber and the oil outlet port by feeding compressed high pressure gas in the upper chamber within the upper cylinder to the operating portion of the main valve when the limiting valve is moved by the upper piston, and the oil chamber and the oil inlet port are connected and the oil chamber and the oil outlet are shut off when the limiting valve is not moved by the upper piston, and when the oil chamber is connected with the oil inlet port, the lower piston is pressed upward by the pressure oil fed into the oil chamber.
  • the conventional impact motive implement compressed air or mechanical driving means.
  • compressed air because air exhausting is performed at every stroke, consumption of compressed air is great, and an air compressor must be kept in operation at all times to supply compressed air. Not only is this inconvenient but it causes noise due to the exhaust sound.
  • the cam thereof is driven with an electric motor or an air motor, and it has the drawback of being subject to frequent troubles due to vibration and it also causes noise.
  • the first object of this invention is to provide an impact motive implement which requires no air compressor.
  • the second object of this invention is to provide an I impact motive implement which can be used to obtain a strong impact force by taking advantage of hydraulic pressure and gas pressure.
  • the third object of this invention is to provide an impact motive implement equipped with a rapid liquid exhausting device for exhausting quickly the liquid used to compress gas to obtain a strong impact force with the high pressure gas compressed with hydraulic pressure.
  • the implement according to the invention is comprised of a main body providedwith an upper cylinder and a lower cylinder, an upper piston fitted into the cylinder atits upper portion and actuated by gas pressure, a lower piston fitted intothe lower cylinder and actuated by hydraulic pressureand a chisel mounted at the lower portion of the main body and movable up-anddown.
  • the gas within the upper cylinder is compressed, and when each piston reaches the top dead position thereof, then the oil within the lower cylinder is exhausted quickly, the upper and lower pistons are lowered quickly by the pressure of the compressed gas within the upper cylinder, and the lower end of the lower piston strikes against the upper end of the chisel.
  • FIG. 1 is a longitudinal section of an embodiment of the impact motive implement according to this invention, a part of the chisel being broken away.
  • FIG. 2 is an elevation of an enlarged longitudinal section of the limiting valve portion of the impact motive implement according to this invention.
  • This impact motive implement' is comprised of the .main body 11 having an upper cylinder 12 and a lower cylinder 13, an upper piston 14 fitted into the upper cylinder 12, a lower piston 15 fitted into the lower cylinder 13 and a chisel 17 fitted into the chisel holder 16 .at the lower end of the main body and movable up-anddown.
  • the upper piston 14 and the lower piston 15 are connected integrally by a piston rod 18, the upper piston 14 is larger in diameter than the lower piston 15, and the piston rod is smaller in diameter than the lower piston 15.
  • the lower piston 15 is slidably positioned in said main valve 19, and the lower end portion 20 of the lower piston 15 faces to the upper end of the chisel 17.
  • This lower end portion 20 is smaller in formed integrally the valve piston 24, and this piston is fitted in the middle cylinder 25.
  • a peripheral groove 26 located at the lower end of and outside of the main valve 19 when said main .valve is in the lowermost position and an oil outlet port 27 communicating with this peripheral groove 26 is formed in the lower cylinder.
  • a peripheral groove 29 coincident .with said communicating ports when the main valve 19 is in the lowermost position is formed in the inner periphery of the lower cylinder.
  • An oil inlet port 30 communicating with this peripheral groove 29 is formed in the lower cylinder 13.
  • a bushing 31 is fitted securedly inside the lower end of the lower cylinder 13, and the lower end portion 20 of the lower piston 15 is slidable in this bushing 31, and also the lower end of the main valve 19 is fitted around an annular projection 36 on the upper end of the bushing 31. The lower end of the main valve 19, when it is in the lowered position, shuts off said peripheral groove 26 from the oil chamber 22.
  • Said chisel 17 has a flange 32 formed at the middle thereof, the upper portion of this flange 32 slidably fitting in a bushing 34 fitted securely in a screw threaded cylinder 33 on the lower end of the main body 11.
  • Said chisel holder 16 is threaded on said screw threaded cylinder 33, and the chisel 17 is prevented from dropping off by engagement of the flange 32 with the edge 35 projecting inwardly on the lower end of said chisel holder 16.
  • a handle cap 37 On the upper portion of the main body 11 is secured a handle cap 37, and in a longitudinal hole in the center of this cap 37 is secured a bushing 38. In the middle of this bushing 38 is formed a peripheral groove 39, and in the lower end thereof is concentrically formed a valveport 40 smaller in diameter than theinner diame ter thereof and this valve port 40 communicates with the inside of the upper cylinder 12.
  • a limiting valve 43 is slidably fitted in said bushing 38 from above for closing said valve port 40.
  • a spring 44 disposed between a spring receiver 45 secured on the cap 37 and a recess 47 inthe limiting valve 43 presses this valve 43 against the valve port 40.
  • a slender limiting valve stem 46 on the lower end of said limiting valve 40 extends into the upper cylinder 12 through the valve port 40.
  • the limiting valve 43 can thus be lifted from the valve port 40 by pushing said limiting valve stem 46 upwardly by the engagement therewith of the upper end of said piston 14 when said piston 14 is raised.
  • the pressure within the upper cylinder l2 and the recess 47 is kept equal by providing a communicating port 48 extending from the lower end of said limiting valve stem 46 to the recess 47 in the limiting valve.
  • a longitudinal communicating port 49 is formed in the upper half of the peripheral wall of the main body 11, the upper end thereof is connected to said peripheral groove 41 by a communicating port 50, and the lower end of said communicating port 49 is connected to the opening 51 at the lower end of the middle cylinder 25.
  • Another communicating port 53 is formed in the upper half portion of the wall of the main body 11, and the upper end thereof has an opening 54 opening into the upper cylinder 12, and the lower end thereof has an opening 56 opening into the chamber 55 between the lower cylinder 13 and the middle cylinder 25.
  • This air pipe 58 is connected to a container for compressed gas such as compressed air or nitrogen and the like.
  • a check valve 60 and a reducing valve 61 are used in this air pipe 58 to prevent back current flowing from the opening 57 to the container 59.
  • An oil pipe connected to the oil inlet port 30 is connected to the exhaust port of a hydraulic pump, and in the oil pipe is provided a suitable control valve which can change-over freely between a state in which a given hydraulic pressure is supplied through the oil inlet port 30 to the oil chamber 22 and a state in which no hydraulic pressure is supplied to the oil chamber 22.
  • the drawing shows the parts in positions in which hydraulic pressure is not supplied to the oil chamber 22.
  • gas kept at a given pressure with the reducing valve 61 is supplied to the upper chamber within the upper cylinder 12, and as the pressure is applied to the upper side of the upper piston 14 it presses the upper piston 14 downward, and the piston rod 18, the lower piston 15 and the lower end all integrated with each other are lowered, and the upper end of the chisel 17 is pressed downward by said lower end 20.
  • a part of the gas pressure is directed to the chamber 55 through the opening 54, the communicating port 53 and the opening 56, and acts on the lower side of the upper piston 14.
  • the pressure receiving area of the lower side of said piston 14 is smaller than that of the upper side thereof, the piston is pressed downward.
  • the oil in the oil chamber 22 is forced out of chamber 22 during the lowering of the lower piston 15 and is returned to the oil tank through the peripheral groove 26 and the oil outlet port 27.
  • the pressure in the upper chamber within the upper cylinder 12 is returned to its constant pressure and the limiting valve is returned to its original state and the valve port 40 is closed, and as the gas pressure in the lower portion within said middle cylinder 25 is returned to its original valve, the main value 19 is also lowered and the lower end thereof is fitted over said annular projection 36 and cuts off the oil chamber 22 from the peripheral groove 26, and the port 28 of the main valve 119 is brought into coincidence with the peripheral groove 29.
  • the impact motive implement according to this invention requires a hydraulic pump, but as most machines for civil engineering have hydraulic pumps, hydraulic pressure may be easily by connecting to these hydraulic pumps.
  • oil outlet port 27 and thepipe connecting the oil outlet port 27 with the oil tank should be made larger and also the main valve 19 should be raised quickly by the action of the high pressure gas so that the entire lower periphery of the oil chamber is to be communicated instantaneously'with the peripheral groove 26, but when the oil exhausting speed is too high, cavitation may be caused and-the portion contacting the to oil might be damaged and then the pressure in the oil chamber at the time of exhausting will be increased.
  • the main valve 19 is cylindrical and when the main valve 19 is raised, due to the presence of said peripheral groove 26, the oil chamber 22 is communication with the peripheral groove 26 and the oil in the oil chamber 22 flows into the peripheral groove 26, with a speed which is considerably reduced,
  • the mechanism of the main valve 19 is shown as being disposed in the main body 11,,but the mechanism of the main valve 19 can be disposed in an intermediate portion of the exhausting pipe to the oil chamber by forming it separately from the main body.
  • An impact motive implement comprising a main body having an upper cylinder and a lower cylinder, an
  • said main body has a middle cylinder between said upper and lower cylinders through which said piston rod extends, said main valve being a cylindrical sleeve slidable in said lower cylinder between the wall of said cylinder and said lower piston, the'oil outlet port being in the bottom of said lower piston and being opened when said main valve is raised above the lowermost position thereof, and said main valve having an opening therein which in the lowermost position of the main valve is aligned with said oil inlet port, and the upper end of said main valve having a piston portion slidable in said middle cylinder, said passage through the main body opening into said middle cylinder beneath the main valve piston.
  • An impact motive implement as claimed in claim 2 wherein said main body has a further passage therethrough from a point in said upper cylinder just above said upper piston when said upper piston is in the lowermost position to the middle cylinder above the uppermost position of the main valve piston, whereby when the pistons have reached their lowermost position, gas under pressure will flow into said middle cylinder and return said main valve to the lowermost position.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
US00013522A 1970-05-01 1971-04-19 Impact motive implement Expired - Lifetime US3735823A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3849170A JPS4929801B1 (fr) 1970-05-01 1970-05-01
JP3849070A JPS501322B1 (fr) 1970-05-01 1970-05-01

Publications (1)

Publication Number Publication Date
US3735823A true US3735823A (en) 1973-05-29

Family

ID=26377752

Family Applications (1)

Application Number Title Priority Date Filing Date
US00013522A Expired - Lifetime US3735823A (en) 1970-05-01 1971-04-19 Impact motive implement

Country Status (4)

Country Link
US (1) US3735823A (fr)
DE (1) DE2121172A1 (fr)
ES (1) ES195738Y (fr)
FR (1) FR2090995A5 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3827507A (en) * 1972-09-18 1974-08-06 Technology Inc Const Hydraulically powered demolition device
US3872934A (en) * 1973-10-30 1975-03-25 Nippon Pneumatic Mfg Impact tool
US3925985A (en) * 1973-01-09 1975-12-16 Rapidex Inc Impact actuator
WO1979000131A1 (fr) * 1977-09-06 1979-03-22 Joy Mfg Co Dispositif hydraulique a percussion
US4261249A (en) * 1978-09-08 1981-04-14 Joy Manufacturing Company Hammer
US4577547A (en) * 1982-07-27 1986-03-25 Jaworski Bill L Impact tool
US4747466A (en) * 1983-09-06 1988-05-31 Jaworski Bill L Impact tool
US6658972B1 (en) * 1999-06-24 2003-12-09 Heidelberger Druckmaschinen Ag Full force web severer
US20050145400A1 (en) * 2003-12-19 2005-07-07 Clark Equipment Company Impact tool
RU2443863C2 (ru) * 2010-03-30 2012-02-27 Институт гидродинамики им. М.А. Лаврентьева Сибирского отделения Российской академии наук (ИГиЛ СО РАН) Устройство ударного действия
US10814468B2 (en) 2017-10-20 2020-10-27 Milwaukee Electric Tool Corporation Percussion tool
US10926393B2 (en) 2018-01-26 2021-02-23 Milwaukee Electric Tool Corporation Percussion tool
RU208326U1 (ru) * 2021-06-25 2021-12-14 Федеральное государственное бюджетное учреждение науки Институт горного дела им. Н.А. Чинакала Сибирского отделения Российской академии наук (ИГД СО РАН) Устройство ударного действия

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI751895A (fr) * 1975-06-26 1976-12-27 Xandor Ag
IT1219714B (it) * 1988-06-14 1990-05-24 Techmo Car Spa Martello azionato idraulicamente particolarmente adatto all' impiego in ambiente polverosi,corrosivi e simili

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2132962A (en) * 1937-11-22 1938-10-11 Mueller Otto Pneumatic hammer
US3490549A (en) * 1968-08-13 1970-01-20 Westinghouse Air Brake Co Hydraulic percussive drill
US3547207A (en) * 1968-11-07 1970-12-15 Vulcan Iron Works Percussion hammer
US3605916A (en) * 1969-11-18 1971-09-20 Bogdan Vyacheslavovich Voitsek Hydraulic hammer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2132962A (en) * 1937-11-22 1938-10-11 Mueller Otto Pneumatic hammer
US3490549A (en) * 1968-08-13 1970-01-20 Westinghouse Air Brake Co Hydraulic percussive drill
US3547207A (en) * 1968-11-07 1970-12-15 Vulcan Iron Works Percussion hammer
US3605916A (en) * 1969-11-18 1971-09-20 Bogdan Vyacheslavovich Voitsek Hydraulic hammer

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3827507A (en) * 1972-09-18 1974-08-06 Technology Inc Const Hydraulically powered demolition device
US3925985A (en) * 1973-01-09 1975-12-16 Rapidex Inc Impact actuator
US3872934A (en) * 1973-10-30 1975-03-25 Nippon Pneumatic Mfg Impact tool
WO1979000131A1 (fr) * 1977-09-06 1979-03-22 Joy Mfg Co Dispositif hydraulique a percussion
US4150603A (en) * 1977-09-06 1979-04-24 Joy Manufacturing Company Fluid operable hammer
US4261249A (en) * 1978-09-08 1981-04-14 Joy Manufacturing Company Hammer
US4577547A (en) * 1982-07-27 1986-03-25 Jaworski Bill L Impact tool
US4747466A (en) * 1983-09-06 1988-05-31 Jaworski Bill L Impact tool
US6658972B1 (en) * 1999-06-24 2003-12-09 Heidelberger Druckmaschinen Ag Full force web severer
US7156190B2 (en) 2003-12-19 2007-01-02 Clark Equipment Company Impact tool
US20050145400A1 (en) * 2003-12-19 2005-07-07 Clark Equipment Company Impact tool
RU2443863C2 (ru) * 2010-03-30 2012-02-27 Институт гидродинамики им. М.А. Лаврентьева Сибирского отделения Российской академии наук (ИГиЛ СО РАН) Устройство ударного действия
US10814468B2 (en) 2017-10-20 2020-10-27 Milwaukee Electric Tool Corporation Percussion tool
US11633843B2 (en) 2017-10-20 2023-04-25 Milwaukee Electric Tool Corporation Percussion tool
US10926393B2 (en) 2018-01-26 2021-02-23 Milwaukee Electric Tool Corporation Percussion tool
US11059155B2 (en) 2018-01-26 2021-07-13 Milwaukee Electric Tool Corporation Percussion tool
US11141850B2 (en) 2018-01-26 2021-10-12 Milwaukee Electric Tool Corporation Percussion tool
US11203105B2 (en) 2018-01-26 2021-12-21 Milwaukee Electric Tool Corporation Percussion tool
US11759935B2 (en) 2018-01-26 2023-09-19 Milwaukee Electric Tool Corporation Percussion tool
US11865687B2 (en) 2018-01-26 2024-01-09 Milwaukee Electric Tool Corporation Percussion tool
RU208326U1 (ru) * 2021-06-25 2021-12-14 Федеральное государственное бюджетное учреждение науки Институт горного дела им. Н.А. Чинакала Сибирского отделения Российской академии наук (ИГД СО РАН) Устройство ударного действия

Also Published As

Publication number Publication date
DE2121172A1 (de) 1971-12-09
ES195738Y (es) 1975-07-01
FR2090995A5 (fr) 1972-01-14
ES195738U (es) 1975-02-01

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