EP0070325B1 - Fluidimpulsgetriebenes Werkzeug mit Drehmomentbegrenzung - Google Patents

Fluidimpulsgetriebenes Werkzeug mit Drehmomentbegrenzung Download PDF

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Publication number
EP0070325B1
EP0070325B1 EP19810105631 EP81105631A EP0070325B1 EP 0070325 B1 EP0070325 B1 EP 0070325B1 EP 19810105631 EP19810105631 EP 19810105631 EP 81105631 A EP81105631 A EP 81105631A EP 0070325 B1 EP0070325 B1 EP 0070325B1
Authority
EP
European Patent Office
Prior art keywords
valve
oil
air
section
actuating member
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
Application number
EP19810105631
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English (en)
French (fr)
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EP0070325A1 (de
Inventor
Masatoshi Mizobe
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.)
Giken Kogyo Co Ltd
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Giken Kogyo 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
Application filed by Giken Kogyo Co Ltd filed Critical Giken Kogyo Co Ltd
Priority to DE8181105631T priority Critical patent/DE3170928D1/de
Priority to EP19810105631 priority patent/EP0070325B1/de
Publication of EP0070325A1 publication Critical patent/EP0070325A1/de
Application granted granted Critical
Publication of EP0070325B1 publication Critical patent/EP0070325B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/145—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers
    • B25B23/1453—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers for impact wrenches or screwdrivers

Definitions

  • This invention relates to a fluid impulse torque tool used in screw tightening operation and more particularly it relates to a torque tool wherein an air motor is rotated to cause an oil pressure generator to produce a pulse pressure, which is used to tighten screws.
  • a torque tool using an oil pressure generator has already been proposed (US-A-3,116,617).
  • This torque tool is adapted to produce an impulse torque by hydraulic means instead of by conventional mechanical means and is characterised by little noise and vibration, as compared with torque tools using mechanical means for producing impulse torques.
  • This hydraulic torque tool has a relief valve attached to an oil pressure pulse generator and is arranged so that when a predetermined tightening force is attained, the relief valve is actuated to allow the working oil in the oil pressure pulse generator to escape as relief oil, thus preventing generation of a pulse pressure above a fixed value.
  • the conventional tool has only the function of preventing generation of a pulse pressure above a fixed value but has no function of automatically stopping the rotation of the air motor.
  • Another fluid impulse torque tool is known from US-A-3,334,487.
  • This known fluid impulse torque tool comprises an air motor which is rotated by being fed with high pressure air; an oil pressure pulse generating section which is connected to said air motor and generates a pulse torque as the air motor is rotated; an on-off operating valve disposed in an air-feed passageway between said on-off operating valve and said air motor, a piston received in an oil chamber and adapted to be moved depending upon the pressure of the oil; and an actuating member for said automatic shut-off valve section, said actuating member being associated with said piston so that it moves together with the latter.
  • This known torque tool is thus arranged so that the rotation of the air motor is automatically stopped when a predetermined torque is attained.
  • One object of the present invention is to provide a torque tool adapted to provide for more reliable automatic stoppage of the air motor by making use of relief oil from a relief valve attached to the oil pressure generator.
  • a further object of the invention is to provide a torque tool wherein relief oil is used to actuate a piston, the actuation of the latter being transmitted to a shut-off valve installed in an air feed passageway to an air motor so that the shut-off valve is closed as the piston is actuated, thereby cutting off the supply of air to the air motor. Renewed operation of the torque tool by the operator should also be possible almost immediately after stopping of the air motor.
  • Another object of the invention is to provide a torque tool which is simple in construction and can be produced at low cost.
  • a fluid impulse torque tool of the kind known from US-A-3,334,487 but characterised in that a relief valve is installed in said pressure pulse generating section and feeds relief oil into the oil chamber, the arrangement being such that when no relief oil is flowing into the oil chamber, the actuating member maintains the automatic shut-off valve section in its opened state, while when relief oil is flowing into the oil chamber to move the actuating member, the automatic shut-off valve section is closed; and in that a rod is integrally connected to a valve body of the automatic shut-off valve section, with the front end of said rod contacting a wall surface of said actuating member, and a groove formed in the wall surface of said actuating member, the arrangement being such that when the front end of the rod contacts the wall surface of the actuating member other than that of said groove, the automatic shut-off valve is maintained in its opened state, but when the actuating member is moved until the front end of the rod fits in the groove, the automatic shut
  • the torque tool comprises an air motor section 10, an oil pressure pulse generating section 11, a piston section 12, an automatic shut-off valve section 13, a reversing valve section 14, and an on-off operating valve section 15.
  • the automatic shut-off valve section 13 is disposed in an air feed passageway through which high pressure air is fed to the air motor section 10.
  • the torque produced in the air motor section 10 is transmitted to the oil pressure pulse generating section 11; where a pulse pressure for screw tightening is produced.
  • the piston section 12 is actuated by relief oil from the oil pressure pulse generating section 11.
  • the actuation of the piston section 12 is transmitted to the automatic shut-off valve section 13 through suitable connecting means.
  • the on-off operating valve section 15 is manually opened and closed by the operator.
  • the construction and functioning of the air motor section 10 are as follows.
  • An air motor 20 is housed in a casing 19 and is rotated at high speed when fed with high pressure air. Since the air motor 20 is of substantially the same construction as those commonly used, it will be described only briefly herein.
  • a rotor 21 is supported at both ends thereof for rotation in cylinder covers 22.
  • the rotor 21 has vanes 23 radially movably received therein.
  • a cylinder 24 is disposed radially outwardly of the rotor 21 and the vanes 23 are rotated with their outer ends kept in contact with the inner wall surface of said cylinder 24 at all times.
  • the inner wall surface of the cylinder 24 is circular, as viewed in cross-section, but the center line at the origin of the inner radius of the cylinder 24 is deviated from the center line of the rotor 21.
  • the vanes 23 are rotated with their outer ends centrifugally pressed against the inner wall surface of the cylinder 24 at all times while the vanes 23 are radially outwardly and inwardly moved as they are rotated.
  • the wall of the cylinder 24 is formed with air passage holes 25, 26 and 27 at three places.
  • the holes 25 serve as air feed holes and the holes 26 and 27 as exhaust holes. More particularly, high pressure air fed in through the holes 25 acts on the vanes 23 to rotate the rotor 21.
  • the numeral 28 denotes bearings for supporting the rotor 21.
  • the construction and functioning of the oil pressure pulse generating section 11 are as follows.
  • the section 11 is known in the art and may be substantially the same as that disclosed in US-A-3,116,617. Therefore, it will be described only briefly herein.
  • a main shaft 30 is installed in a liner 31.
  • the clearance between the main shaft 30 and the liner 31 is filled with oil.
  • the main shaft 30 has a driving blade 32 radially movably received therein.
  • the driving blade 32 is radially outwardly urged by springs 33, so that its front end is in contact with the inner wall surface of the liner 31.
  • the numeral 34 denotes a liner case and 35, 36 denote liner case lids or end plates.
  • the end 37 of one liner case lid 35 is spline-wise connected to the rotor 21 of the air motor, so that when the rotor 21 is rotated, the liner case lid 35 is rotated, thus rotating the liner 31, liner case 34 and the other liner case lid 36.
  • the radially outermost surface of the main shaft 30, which is disposed within the liner 31 contacts the inner wall surface of the liner 31 at certain rotative positions, and concurrently therewith an oil pressure difference is temporarily produced across the driving plate 32 within the liner 31, resulting in a pulse pressure which acts on the main shaft 30 and produces a torque in the latter.
  • the numeral 38 denotes a cover, through which the end 39 of the main shaft 30 extends to receive a suitable attachment thereon for con- necton to a bolt head or the like.
  • the liner 31 has a relief valve 40 installed therein.
  • the relief valve 40 When a predetermined amount of oil pressure is reached, i.e. the oil pressure in the liner 31 rises above a fixed value, the relief valve 40 is opened to release part of the oil in the liner 31, preventing generation of a pulse pressure above a fixed value.
  • the ball 41 of the relief valve 40 is subjected to a pressing force produced by a spring 43 through a ball seat 42, so that normally the ball 41 closes an oil passageway 44 leading to the interior of the liner 31.
  • the oil pressure moves the ball 41 against the bias force of the spring 43, as shown in Fig.
  • a needle valve 46 is placed in the oil passageway 45 to control the flow rate of oil through the oil passageway.
  • the numeral 47 denotes a bolt for supporting the spring 43 and the spring pressure on the ball 41 can be adjusted by said bolt 47.
  • a nut 48 bears against the rear surface of the liner case lid 35 to prevent the liner 31 and the liner case lids 35 and 36 from slipping in the liner case 34.
  • the oil chamber 50 is centrally formed in the liner case lid 35.
  • a piston 51 is housed in the oil chamber 50 and is movable in the oil chamber 50.
  • the oil chamber 50 serves as a cylinder for the piston 51.
  • the oil passageway 45 opens into the rear chamber 50a of the oil chamber 50, so that when relief oil flows through the oil passageway 45 into the rear chamber 50a, the piston 51 is pushed by the relief oil to move forward (to the right as viewed in Fig. 1).
  • a spring 52 is installed in the front chamber 50b of the oil chamber 50 to urge the piston 51 in the direction of retraction to the left as viewed in Fig. 1 at all times.
  • the movement of the piston 51 is transmitted to the automatic shut-off section 13 by a rod 54, which extends through a throughgoing hole or passage 55 centrally formed in the rotor 21 of the air motor.
  • the rear end of the rod 54 is in contact with a shut-off valve actuating member 56, which is slidably received in a cylindrical hole or passage 57 formed in a casing rear cover 58.
  • the open end of the cylindrical hole 57 is closed by a threaded plug 59.
  • a spring 60 is interposed between the actuating member 56 and the threaded plug 59, urging the actuating member 56 to the left at all times.
  • the side wall 62 of the actuating member 56 is formed with an annular groove 61.
  • the numeral 62 denotes a part of the wall surface other than that of the groove 61.
  • a valve body 63 is received in a valve chamber 64 formed in the casing rear cover 58.
  • the valve body 63 closes the valve on contacting a valve seat 65 and opens the valve on separation, from the valve seat.
  • one shown at 66 communicates with the reversing valve section 14 and the other air passageway 67 communicates with the air passage holes 25 in the air motor 20.
  • the high pressure air passes through the space between the valve body 63 and the valve seat 65, during which time the air pressure acts on the valve body 63, which is thereby subjected to a force which urges it into contact with the valve seat 65.
  • the valve body 63 is subjected to a back pressing force produced by a spring 68.
  • the back pressing force from the spring 68 is weaker than the valve closing force of the air acting on the valve body 63, and it is impossible for the force of the spring 68 alone to prevent the valve body 63 from closing the valve. For this reason, a rod 69 is attached to the valve body 63.
  • the rod 69 extends through a hole 70 to enter the cylindrical hole 57 through its wall, the front end of said rod 69 contacts the wall surface of the actuating member 56.
  • the valve body 63 cannot move in the valve closing direction, so that the valve body 63 is maintained in the illustrated open position of the valve even if the air pressure is acting on the valve body 63.
  • the actuating member 56 it is necessary for the actuating member 56 to be positioned at the left, as shown in Fig. 5, with the front end of the rod 69 contacting the wall surface 62 other than that of the groove of the actuating member 56.
  • a valve body 74 is rotatably received in a bushing 75.
  • the valve body 74 is manipulated with a knob 76.
  • the bushing 75 is formed with four holes 77 located such that setting the valve body 74 at its solid line position shown in Fig. 7 establishes the communication between the holes 77a and 77b and between the holes 77c and 77d and setting it in its broken line position shown in Fig. 7 by means of the knob 73 establishes the communication between the holes 77a and 77d and between the holes 77b and 77c.
  • the hole 77a is connected to an air passageway 78 leading to the on-off operating valve section 15, the hole 77b is connected to the air passageway 66 leading to the automatic shut-off valve section 13, and the hole 77c is connected to an air passageway 79, which communicates with the air passage holes 27 in the air motor 20 as well as with an exhaust passageway 80.
  • the latter extends along the outer side of the liner case 34 of the oil pressure pulse generating section 11 to reach exhaust holes 81 formed in the front wall of the cover 38. Thus, all the exhaust air from the air motor is discharged through said exhaust passageway 80.
  • the hole 77d is connected to an air passageway 82 leading to the air passage holes 26 in the air motor 20.
  • the exhaust passing through the air holes 27 is discharged through the exhaust holes 81 via the exhaust passageway 80.
  • the exhaust passing through the air passage holes 26 passes through the air passageway 82 and then through the reversing valve section 14 and is likewise discharged through the exhaust holes 81 via the exhaust passageway 80.
  • These exhausts serve to cool the oil pressure pulse generating section 11 when passing through the exhaust passageway 80. If the knob 76 is turned to move the valve body 74 to the broken line position shown in Fig. 7, the holes 77a and 77d communicate with each other, so that the high pressure air passes successively through the holes 77a and 77d, the air passageway 82 and the air holes 26 to enter the cylinder 24 of the air motor. In this case, therefore, the air passage holes 26 serve as air feed ports and the air passage holes 25 and 27 as exhaust ports, and the rotor 21 is rotated in the reverse direction.
  • a hose joint 85 attached to the end of a handle portion of the casing 19 provides a connection to an air feed hose from a compressor or the like, so that high pressure air is first fed to the valve section 15.
  • a valve body 87 is housed in a valve chamber 86 and is adapted to contact and separate from a valve seat 89 at the end of a bushing 88.
  • the bushing 88 is formed with air passage holes 90 communicating with the air passageway 78 leading to the reversing valve section 14.
  • a rod 91 integral with the valve body 87 extends through the bushing 88, with the front end of the rod 91 contacting an operating lever 92.
  • the operating lever 92 is pivotally supported on a pin 93, allowing the operator to manipulate the operating lever 92 with the fingers.
  • the rod 91 contacting the operating lever 92 is depressed, separating the valve body 87 from the valve seat 87 to open the valve, admitting high pressure air into the air passageway 78.
  • the combined action of the air pressure and spring 94 moves the valve body 87 into contact with the valve seat 89, thus closing the valve.
  • the fluid impulse torque tool is arranged so that manipulating the lever 92 opens the on-off operating valve section 15, admitting high pressure air into the reversing valve section 14 via the air passageway 78, and if the reversing valve section 14 has been set by the knob 76 at the position for forward rotation shown in solid lines in Fig. 7, the high pressure air is fed to the automatic shut-off valve section 13. If the valve section 13 is in its opened state, the high pressure air is allowed to pass through the valve section 13 to the air motor section 10, where it rotates the rotor 20 in the forward direction and is then discharged.
  • the rotation of the air motor 20 is transmitted directly to the oil pressure pulse generating section 11 to rotate the liner 31, and a torque produced by the pulse pressure is imparted to the main shaft 30 to perform the screw tightening operation.
  • a bolt or the like is tightened up, the rotation of the main shaft 30 is prevented, with the result that the oil pressure in the liner 31 increases.
  • the relief valve 40 is automatically opened to allow part of the oil on the high pressure side in the liner 31 to escape as relief oil. As a result, there is no possibility of the pressure in the liner 31 increasing above the fixed value.
  • This relief oil flows into the oil chamber 50 of the piston section 12, pushing the piston 51.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Claims (8)

1. Ein fluidimpulsgetriebenes Werkzeub mit Drehmomentbegrenzung mit:
einem Luftmotör (20), der durch Zufuhr von Luft mit hohem Druck gedreht wird;
einem Öldruckimpuls-Erzeugungsabschnitt (11), der mit dem Luftmotor verbunden ist und ein Impuls-Drehmoment bei der Drehung des Luftmotors erzeugt;
einem in Ein/Aus-Betrieb arbeitenden Ventil (15), das in einem Luftzuführ-Durchlaß (78) angeordnet ist, durch den Luft mit hohem Druck zu dem Luftmotor (20) geführt wird;
einem automatischen Abschalt-Ventilabschnitt (13), der in einem Luftdurchlaß (66) zwischen dem im Ein/Aus-Betrieb arbeitenden Ventil (15) und dem Luftmotor (20) angeordnet ist;
einem in einer Ölkammer (50) aufgenommenen Kolben (51), der ausgelegt ist, in Abhängigkeit vom Öldruck bewegt zu werden; und
einem Betätigungsglied (56) für den automatischen Abschalt-Ventilabschnitt (13), wobei das Betätigungsglied (56) dem Kolben (51) so zugeordnet ist, daß es sich mit dem letzteren bewegt;
dadurch gekennzeichnet, daß ein Entlastungsventil (40) in dem Druckimpuls-Erzeugungsabschnitt (11) eingesetzt ist und Entlastungsöl in die Ölkammer (50) liefert, wobei die Anordnung so ist, daß dann, wenn kein Entlastungsöl in die Ölkammer (50) fließt, das Betätigungsglied (56) den automatischen Abschalt-Ventilabschnitt (13) in seinem geöffneten Zustand hält, während dann, wenn Entlastungsöl in die Ölkammer (50) zur Bewegung des Betätigungsgliedes (56) fließt, der automatische Abschalt-Ventilabschnitt (13) geschlossen ist; und daß ein Stab (69) integral mit einem Ventilteil (63) des automatischen Abschalt- Ventilabschnittes (13) verbunden ist, wobei das vordere Ende des Stabes (69) eine Wandfläche (62) Betätigungsgliedes (56) berührt, und wobei eine Nut (61) in der Wandfläche (62) des Betätigungsgliedes (56) ausgebildet ist, mit einer solchen Anordnung, daß dann, wenn das vordere Ende des Stabes (69) die Wandfläche des Betätigungsgliedes außerhalb der Nut (61) berührt, das automatische Abschalt-Ventil (13) in dem offenen Zustand gehalten ist, jedoch dann, wenn das Betätigungsglied (56) bewegt wird, bis das vordere Ende des Stabes (69) in die Nut (61) paßt, der automatische Abschalt-Ventilabschnitt (13) automatisch geschlossen ist.
2. Ein fluidimpulsgetriebenes Werkzeug mit Drehmomentbegrenzung nach Anspruch 1 und dadurch gekennzeichnet, daß das Ventilteil (63) des automatischen Abschalt-Ventilabschnittes (13) immer dann, wenn dieser mit Luft von hohem Druck versorgt wird, einer durch den Luftdruck erzeugten Kraft unterworfen ist, die das Ventilteil (63) in Ventilschließrichtung drängt.
3. Fluidimpulsgetriebenes Werkzeug mit Drehmomentbegrenzung nach einem der vorangehenden Ansprüche und gekennzeichnet durch eine Feder (52), die eine Rückdruckkraft auf den Kolben (51) erzeugt, so daß dann, wenn Entlastungsöl in die Ölkammer (50) fließt, der Kolben (51) gegen die Kraft der Feder (52) bewegt wird, jedoch dann, wenn kein Öl in die Ölkammer (50) fließt, die Rückstellkraft der Feder (52) den Kolben (51) in seine Ausgangsstellung zurückbewegt, wobei das Entlastungsöl aus der Ölkammer (50) herausgeschoben wird.
4. Fluidimpulsgetriebenes Werkzeug mit Drehmomentbegrenzung nach Anspruch 3 und dadurch gekennzeichnet, daß das Entlastungsöl in der Ölkammer (50) unter Einwirkung der Rückstellkraft der Feder (52) an dem Kolben (51) vorbei zu dem öldruckimpulserzeugenden Abschnitt (11) verschoben wird.
5. Fluidimpulsgetriebenes Werkzeug mit Drehmomentbegrenzung nach Anspruch 2 und dadurch gekennzeichnet, daß das Ventilteil (63) des automatischen Abschaltventilabschnittes (13) einer schwachen Rückdruckkraft von einer Feder (68) unterworfen ist, so daß dann, wenn die Zufuhr von Luft mit hohem Druck abgesperrt ist, das Ventilteil (63) in Ventilöffnungsrichtung unter der Rückstellkraft dieser Feder (68) bewegt wird.
6. Fluidimpulsgetriebenes Werkzeug mit Drehmomentbegrenzung nach einem der vorangehenden Ansprüche und dadurch gekennzeichnet, daß das im Ein/Aus-Betrieb arbeitende Ventil (15) mit dem Luftmotor verbunden ist und daß ein Nadelventil (46) zwischen das Ölentlastungsventil (40) und die Ölkammer (50) eingesetzt ist.
7. Fluidimpulsgetriebenes Werkzeug mit Drehmomentbegrenzung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß ein Abluft-Durchlaß (82) in Verbindung mit Luft-Durchtrittsbohrungen (26, 27) des Luftmotors (20) sich an dem öldruckimpulserzeugenden Abschnitt (11) vorbei erstreckt, wodurch den Luftmotor (20) über die Luftdurchlaßbohrungen (26, 27) verlassende Abluft den öldruckimpulserzeugenden Abschnitt (11) beim Durchlaufen des Abluft-Durchlasses kühlt.
EP19810105631 1981-07-17 1981-07-17 Fluidimpulsgetriebenes Werkzeug mit Drehmomentbegrenzung Expired EP0070325B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8181105631T DE3170928D1 (en) 1981-07-17 1981-07-17 Fluid impulse torque tool
EP19810105631 EP0070325B1 (de) 1981-07-17 1981-07-17 Fluidimpulsgetriebenes Werkzeug mit Drehmomentbegrenzung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19810105631 EP0070325B1 (de) 1981-07-17 1981-07-17 Fluidimpulsgetriebenes Werkzeug mit Drehmomentbegrenzung

Publications (2)

Publication Number Publication Date
EP0070325A1 EP0070325A1 (de) 1983-01-26
EP0070325B1 true EP0070325B1 (de) 1985-06-12

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EP19810105631 Expired EP0070325B1 (de) 1981-07-17 1981-07-17 Fluidimpulsgetriebenes Werkzeug mit Drehmomentbegrenzung

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DE (1) DE3170928D1 (de)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE432071B (sv) * 1982-09-24 1984-03-19 Atlas Copco Ab Hydraulisk impulsmutterdragare
JPS59140173U (ja) * 1983-03-04 1984-09-19 瓜生製作株式会社 油圧式トルクレンチ
DE3335005A1 (de) * 1983-09-28 1985-04-18 Robert Bosch Gmbh, 7000 Stuttgart Kraftbetriebenes handwerkzeug mit einem druckluftmotor
US4604943A (en) * 1985-02-04 1986-08-12 Ingersoll-Rand Company Impulse tool having shut off system
US5217079A (en) * 1987-05-05 1993-06-08 Cooper Industries, Inc. Hydro-impulse screwing device
DE3717630A1 (de) * 1987-05-26 1988-12-15 Gardner Denver Gmbh Hydro-impulsschrauber
EP0398655B1 (de) * 1989-05-15 1995-09-27 Uryu Seisaku, Ltd. Drucküberwachungsmittel für Drehmoment-Schraubenschlüssel
EP0638394B1 (de) * 1993-08-06 1998-04-22 Fuji Kuuki Kabushiki Kaisha Hydro-Impulsschrauber mit Selbst-Abschalt-Vorrichtung
US5531279A (en) * 1994-04-12 1996-07-02 Indresco Inc. Sensor impulse unit
JP3401544B2 (ja) * 1998-10-15 2003-04-28 不二空機株式会社 油圧式パルスレンチの締付制御装置
JP5547004B2 (ja) * 2010-09-07 2014-07-09 瓜生製作株式会社 油圧式トルクレンチの打撃トルク調節装置
CN112775885B (zh) * 2018-09-26 2022-12-06 湖南海豹汽车零部件制造有限公司 一种自动锁螺丝机及其操作方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3253662A (en) * 1961-10-20 1966-05-31 Cooper Bessemer Corp Controlled torque tool
US3116617A (en) * 1961-12-12 1964-01-07 Ingersoll Rand Co Fluid impulse torque tool
US3174606A (en) * 1962-12-20 1965-03-23 Ingersoll Rand Co Torque control for driving means
US3334487A (en) * 1965-09-07 1967-08-08 Ingersoll Rand Co Impulse tool with improved cut-off device
US3970151A (en) * 1975-07-03 1976-07-20 Gardner-Denver Company Torque responsive motor shutoff for power tool

Also Published As

Publication number Publication date
EP0070325A1 (de) 1983-01-26
DE3170928D1 (en) 1985-07-18

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