EP1238757B1 - Pneumatischer Schrauber mit Begrenzung der Einschraubtiefe - Google Patents

Pneumatischer Schrauber mit Begrenzung der Einschraubtiefe Download PDF

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Publication number
EP1238757B1
EP1238757B1 EP02004959A EP02004959A EP1238757B1 EP 1238757 B1 EP1238757 B1 EP 1238757B1 EP 02004959 A EP02004959 A EP 02004959A EP 02004959 A EP02004959 A EP 02004959A EP 1238757 B1 EP1238757 B1 EP 1238757B1
Authority
EP
European Patent Office
Prior art keywords
air
chamber
valve
screw
piston
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
EP02004959A
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English (en)
French (fr)
Other versions
EP1238757A3 (de
EP1238757A2 (de
Inventor
Hiroshi Tanaka
Junichi Tamura
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.)
Max Co Ltd
Original Assignee
Max Co Ltd
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Filing date
Publication date
Application filed by Max Co Ltd filed Critical Max Co Ltd
Publication of EP1238757A2 publication Critical patent/EP1238757A2/de
Publication of EP1238757A3 publication Critical patent/EP1238757A3/de
Application granted granted Critical
Publication of EP1238757B1 publication Critical patent/EP1238757B1/de
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
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C7/00—Accessories for nailing or stapling tools, e.g. supports
    • 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
    • B25B23/0064—Means for adjusting screwing depth
    • 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
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
    • B25B21/023—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket for imparting an axial impact, e.g. for self-tapping screws

Definitions

  • the invention relates to a screw string machine according to the preamble of claim 1.
  • a screw striking machine is known from EP-A-0 967 052 .
  • the screw striking machine employs the following mechanism.
  • a main body of the screw striking machine is pressed against a member to be screwed, and the screw is struck into a member to be screwed by a driver bit integrally coupled to a piston operated upon operation of a trigger lever in a state that the screw is floated up from the surface of the member to be screwed.
  • a stopper holding the screw striking machine is released, the screw striking machine is further pressed against the member to be screwed, whereby the driver bit is moved, by means of an air motor, a distance corresponding to the floating of the screw to be stuck.
  • a stop valve cuts off the supply of compressed air to the air motor when the screw striking machine is driven to the stroke end, and an exhaust valve operates when the piston reaches to the lower dead point.
  • the stop valve and the exhaust valve cooperate to automatically stop the rotation of the air motor, whereby the stable screwing depth of the screw is controlled.
  • Such an automatic stopping device as disclosed in JP-A-2000-326248 is known.
  • a contact arm 18 finishes screwing.
  • an auxiliary open/closing valve (exhausting valve) 35 operates to exhaust the compressed air from a pilot air chamber 23a of a opening/closing valve (stop valve) 22 and to cause the opening/closing valve 22 to close. As a result, the rotation of the air motor is stopped.
  • a pressure within the auxiliary open/closing valve 35 has increased.
  • the air exhaust hole 46 is closed by the contact arm 18, the compressed air is discharged from the pilot air chamber 23a. Accordingly, the opening/closing valve 22 operates, and the supply of compressed air to the air motor is stopped, and the air motor stops. That is , the rotation of the air motor is stopped in a state that the piston 10 is floated up from the bottom dead end.
  • the screw 32 also floats up from the surface of the screwed object 51, viz., a screw floating state is set up.
  • an object of the present invention is to provide a screw striking machine in which the air motor is effectively prevented from stopping its rotation, and the air motor does not stop until a predetermined screwing operation finishes even if before the screwing operation ends, the screw striking machine is strongly pressed against the screwed object and the piston is pushed into the main body of the screw striking machine.
  • the present invention provides a screw striking machine as defined in independent claim 1.
  • FIG. 1 shows a screw striking machine 1.
  • a pneumatic cylinder 3 and an air motor 4 are accommodated in a housing 2.
  • a trigger valve 7 located within a grip portion 5 is opened and closed by a trigger lever 6, which is disposed in the front position of a grip portion 5 of the housing 2.
  • the interior portion of the grip portion 5 is formed as an air chamber 8.
  • An air hose is connected to an air hose connector 9 mounted on the bottom portion of the grip portion 5, whereby compressed air can be supplied from an air compressor to the air chamber 8 through the air hose.
  • a spline groove is formed in the outer peripheral surface of a driver bit 11, which is coupled to a piston 10.
  • the driver bit 11 is inserted into a spline-grooved hole located in the center of a gear 12 mounted within the front part of the housing 2.
  • the piston 10 and driver bit 11 is slidable relative to the gear 12.
  • a power of the air motor 4 for rotationally driving the driver bit 11 is transmitted to the final gear 12 through a plurality of reduction gears 13 arranged in the front of the housing 2.
  • a swingable free arm 17 is mounted on the trigger lever 6.
  • a contact arm 18, facing the front surface of the free arm 17, extends to the front through the rear surface (in Fig. 1 ) of the pneumatic cylinder 3, and projects from the nose portion 14 in a screw ejecting direction.
  • a chuck 20, operable for opening and closing, is pivotally mounted on a screw guide 19, which is provided at the front end of the contact arm 18, slidable back and forth, and is normally closed by a spring (not shown).
  • the screw guide 19 is pressed against a member to be screwed, such as a building material, and the contact arm 18 is pushed into the member to be screwed, so that the contact arm 18 comes on contact with the leading end of the free arm 17.
  • the trigger lever 6 is rotationally operated, then the stem of the trigger valve 7 is pushed through the free arm 17 to thereby switch the state of the trigger valve 7, so that the pneumatic cylinder 3 and the air motor 4 cannot be operated only by the operation of the trigger lever 6.
  • This structure is known as a wrong screw ejection preventive mechanism.
  • An automatic stop device 21 is provided on the side surface (in Fig. 1 , the back surface of the pneumatic cylinder 3) of the housing 2 shown in Fig. 2 .
  • the automatic stop device includes two stop valves for opening and closing the air supply passage to the air motor 4.
  • FIG. 3 shows a state in which the automatic stop device 21 is put in a waiting state.
  • a stop valve 22 of the automatic stopping device 21 includes a cylindrical main stem 24 as inserted into a valve sleeve portion 23, and a pilot stem 25 having a small diameter as inserted into the lower part of the main stem 24.
  • O rings 26 are disposed around the main stem 24.
  • the main stem 24 is put at a raised position under the urging by a compression spring 27.
  • a compression spring 27 As shown in the figure, an entrance port 28 and an exit port 29, which are located in an upper part of the valve sleeve portion 23, are located at such positions allowing those ports to always communicate with each other.
  • the pilot stem 25 is energized downward by a compression spring 30, which is inserted into the main stem 24, to thereby close a vent port 31 formed in the lower part of the valve sleeve portion 23.
  • a valve member 33 having a shutter 45 is mounted on the lower end of the pilot spool 25, and faces the upper end of the contact arm 18.
  • the compressed air of the air chamber 8 is supplied to a pilot air chamber 23a formed on the lower surface of the main stem 24 through the interior part of the main stem 24.
  • the entrance port 28 formed in the upper part of the stop valve 22 is connected to the air chamber 8.
  • the exit port 29 thereof is connected to the air motor 4.
  • An air exhaust valve 35 is disposed parallel to the stop valve 22.
  • the air exhaust valve 35 includes a valve stem 37, which slidably moves within a valve sleeve part 36.
  • the valve stem 37 is energized downward by a compression spring 38 to thereby normally shut off the communication between vent ports 31 and 40 of the stop valve 22.
  • An air passage 41 is formed in the pneumatic cylinder 3.
  • the air passage 41 discharges compressed air acting on the back surface of the piston 10 when the piston 10 reaches a position near the lower dead point.
  • One end of the air passage 41 faces an opening port 3b.
  • the other end of the air passage contains a valve chamber 47 for operating an air exhaust valve 35, which opens to communicate the pilot air chamber 23a with the open air and closes to shut off its communication with the open air.
  • An air exhaust hole 46 is formed in the valve chamber 47.
  • the air exhaust hole 46 is formed so as to be opened and closed in synchronism with a vertical movement of the contact arm 18. That is, the L-shaped shutter 45 is constructed so as to open and close the air exhaust hole 46 in synchronism with the vertical movement of the contact arm 18.
  • the vent port 31 of the stop valve 22 is connected to the air exhaust valve 35.
  • the pilot air chamber 23a on the lower surface of the main stem 24 of the stop valve 22 communicates with the open air through the vent port 31 and the vent port 40.
  • a timer chamber 50 is formed upstream of the valve chamber 47 in the air passage 41.
  • the timer chamber 50 produces a time delay until the compressed air flows into the valve chamber 47 and a pressure within the chamber increases.
  • the timer chamber 50 stores for a short time the compressed air flowed from the opening port 3b to the air passage 41 when the piston 10 reaches a position near the lower dead point. This compressed air is stored in the timer chamber 50. Accordingly, the air exhaust valve 35 also delays in its operation.
  • the piston 10 passes through the opening port 3b of the pneumatic cylinder 3, the high compressed air within the pneumatic cylinder 3 flows into the air passage 41 and is supplied to the valve chamber 47 through the timer chamber 50. However, this compressed air is discharged into the open air from the air exhaust hole 46 as shown in Fig. 7 . Accordingly, it is put in a state of free discharge.
  • the contact arm 18 pushes up the valve member 33 to thereby slide the pilot stem 25 of the stop valve 22 upward. If the pilot stem 25 is slid upward, communication is set up between the pilot air chamber 23a of the lower surface of the main stem 24 and the vent port 31.
  • the contact arm 18 pushes upward the pilot stem 25 of the stop valve 22, while at the same time, the L-shaped valve member 45 closes the air exhaust hole 46 of the air exhaust valve 35.
  • the compressed air which has been put in a state of free discharge into the open air, fills the valve chamber 47, so that a pressure within the chamber increases and pushes up the valve stem 37 of the air exhaust valve 35 as shown in Fig. 8 .
  • the compressed air within the pilot air chamber 23a of the stop valve 22 flows from the vent port 31 into the open air through the vent port 40.
  • the pilot pressure acting on the lower surface of the main stem 24 is discharged from the vent port 40 to the open air via the vent port 31 and the air exhaust valve 35.
  • This causes a difference between the pressures respectively acting on the upper and lower surfaces of the main stem 24, and the main stem 24 descended.
  • the O ring 26 disposed on the most upper portion cuts off the communication between the entrance port 28 and the exit port 29. Accordingly, the air supply to the air motor 4 is cut off, and the air motor 4 is stopped.
  • the contact arm 18 is lowered down and is thereby separated from the pilot stem 25.
  • the L-shaped valve member 45 opens the air exhaust hole 46 to thereby resume the discharge of the compressed air within the valve chamber 47, so that the stem 37 of the air exhaust valve 35 is moved down to return back to its initial position. Accordingly, the compressed air is discharged to the open air without any control, that is, in a state of free discharge, and the communication between the vent ports 31 and 40 is cut off.
  • pilot stem 25 If the pilot stem 25 is moved down, the communication between the pilot air chamber 23a and the vent port 31 is cut off and, at the same time, the air chamber 8 and the pilot air chamber 23a are allowed to communicate with each other and thus the compressed air is supplied from the entrance port 28 to the pilot air chamber 23a, thereby causing the main stem 24 to float up and return back to its initial position.
  • the trigger valve 7 is closed and the head valve 42 is thus lowered down to return back to its initial position shown in Fig. 3 .
  • the piston 10 and the driver bit 11 are respectively moved upward and return back to their respective initial positions due to the pressure of a blow-back chamber 44 which is formed in the outer periphery of the lower part of the pneumatic cylinder 3.
  • the pressure supply from the inside of the pneumatic cylinder 3 to the air passage 41 of the air exhaust valve 35 is cut off.
  • the compressed air fed from the timer chamber 50 increases the pressure within the valve chamber 47, as shown Fig. 8 , and the air exhaust valve 35 operates.
  • An O ring 48 causes the air exhaust hole 46 to close, and causes the pilot air chamber 23a of the valve sleeve to discharge the compressed air therefrom, thereby driving the valve sleeve 23 to close.
  • the pilot air chamber 23a is exhausted, and the main stem 24 of the stop valve 22 descends and the stop valve 22 also operates, and the air motor 4 stops its operation.
  • the stopping operation of the air motor 4 is delayed by the timer chamber. Accordingly, the air motor is not stopped until a predetermined fastening operation of the screw is completed during this time.
  • a passage 52 is formed in the timer chamber 50 in addition to the air passage 41.
  • the passage 52 is communicated with a piston return chamber via a check valve 53, and a compressed air stored in the timer chamber 50 is utilized for the return of the piston.
  • the machine size is reduced when comparing with the case where the return chamber and the timer chamber are separately formed. That is, a part of the piston return chamber is used also as the timer chamber, so that there is no need of additionally forming a timer chamber.
  • the check valve 53 blocks the entering of the compressed air from the return chamber.

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

Claims (1)

  1. Schraubeneintreibvorrichtung (1) mit einer automatischen Stoppvorrichtung (21), wobei die Schraubeneintreibvorrichtung (1) umfasst:
    einen Luftmotor (4);
    einen Pneumatikzylinder (3), der einen Kolben (10) aufweist;
    eine Rückschlagkammer (44), die in einem äußeren Umfang des Pneumatikzylinders (3) ausgebildet ist;
    ein Treiberbit (11), das ein Bit aufweist, das in Eingriff bringbar ist mit einem Kopf einer einzutreibenden Schrauben (32) und drehbar mit dem Kolben (10) des Pneumatikzylinders (3) gekoppelt ist;
    wobei das Treiberbit (11) betriebsmäßig mit dem Luftmotor (4) gekoppelt ist, und der Kolben (10) des Pneumatikzylinders (3) angetrieben wird, um das Treiberbit (11) zu veranlassen, die Schraube (32) zu treiben, und das Treiberbit (11) von dem Luftmotor (4) drehend angetrieben wird, um die Schraube (32) einzuschrauben,
    wobei die automatische Stoppvorrichtung (21) umfasst:
    einen Druckluftzuführkanal zu dem Luftmotor (4);
    ein Sperrventil (22) vom gesteuert betriebenen Typ, das in dem Druckluftzuführkanal vorgesehen ist;
    einen Kontaktarm (18), der frei gleiten kann entlang eines Nasenabschnitts (14), der Schraubeneintreibvorrichtung (1) und von einem vorderen Ende des Nasenabschnitts (14) vorsteht;
    eine Steuerluftkammer (23a), die in dem Sperrventil (22) vorgesehen ist, um das Sperrventil (22) durch einen Schiebevorgang zu schließen, der bewirkt wird über eine Ansteigbewegung des Kontaktarms (18) und einer Verbindung mit einer Freiluft;
    einen Luftdurchgang (41), der in dem Pneumatikzylinder (3) vorgesehen ist, um auf eine rückwärtige Oberfläche des Kolbens (10) wirkende Druckluft abzuführen, wenn der Kolben (10) eine Position in der Nähe seines unteren Totpunktes erreicht;
    eine Ventilkammer (47), die in dem Luftdurchgang (41) ausgebildet ist;
    ein Luftauslassventil (35), das geöffnet die Steuerluftkammer (23a) mit der Freiluft verbindet und geschlossen die Verbindung sperrt, wobei das Luftauslassventil (35) über die Ventilkammer (47) betrieben wird;
    ein Luftauslassloch (46), das in der Ventilkammer (47) ausgebildet ist, um Druckluft aus dem Luftdruchgang (41) auszulassen, wobei das Luftauslassloch (46) synchron zu einer vertikalen Bewegung des Kontaktarms (18) geöffnet und geschlossen werden kann; und
    wobei der Luftmotor (4) gestoppt wird durch Schließen des Sperrventils (22) über die Ansteigbewegung des Kontaktarms (18), um in einen Hauptkörper der Schraubeneintreibvorrichtung (1) geschoben zu werden, wenn die Schraube (32) eingeschraubt wird, und
    wobei das Luftauslassventil (35) arbeitet bei Druckzunahme im Inneren der Ventilkammer (47) und das Sperrventil (22) betätigt wird, so dass es sich schließt durch abführen der Druckluft aus der Steuerluftkammer (23a) des Sperrventils (22), wenn der Kolben (10) die Position in der Nähe des unteren Totpunkts erreicht und die Druckluft aus dem Luftdurchgang (41) zu der Ventilkammer (47) strömt und das Luftauslassloch (46) synchron zu der Betätigung des Kontaktarms (18) geschlossen wird,
    dadurch gekennzeichnet, dass die Druckluft von dem Luftdurchgang (41) zu der Ventilkammer (47) über eine Zeitgeberkammer (50) strömt, die stromaufwärts der Ventilkammer (47) in dem Luftdurchgang (41) ausgebildet ist, wobei die Zeitgeberkammer (50) eine Zeitverzögerung erzeugt, bis die Druckluft in die Ventilkammer (47) strömt und ein Druck innerhalb der Ventilkammer (47) zunimmt,
    wobei die Schraubeneintreibvorrichtung (1) ferner umfasst:
    einen Durchgang (52), der zusätzlich zu dem Luftdurchgang (41) in der Zeitgeberkammer (50) ausgebildet ist; und
    ein Rückschlagventil (53), wobei der Durchgang (52) über das Rückschlagventil (53) mit der Rückschlagkammer (44) in Verbindung steht und eine in der Zeitgeberkammer (50) gespeicherte Druckluft zur Rückführung des Kolbens (10) verwendet wird.
EP02004959A 2001-03-05 2002-03-05 Pneumatischer Schrauber mit Begrenzung der Einschraubtiefe Expired - Lifetime EP1238757B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001060812 2001-03-05
JP2001060812A JP4457509B2 (ja) 2001-03-05 2001-03-05 ネジ打ち機の自動停止装置

Publications (3)

Publication Number Publication Date
EP1238757A2 EP1238757A2 (de) 2002-09-11
EP1238757A3 EP1238757A3 (de) 2005-03-16
EP1238757B1 true EP1238757B1 (de) 2008-07-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02004959A Expired - Lifetime EP1238757B1 (de) 2001-03-05 2002-03-05 Pneumatischer Schrauber mit Begrenzung der Einschraubtiefe

Country Status (4)

Country Link
EP (1) EP1238757B1 (de)
JP (1) JP4457509B2 (de)
KR (1) KR100558495B1 (de)
DE (1) DE60227734D1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005014901B4 (de) * 2005-04-01 2012-09-13 Lorenz Stöger Pneumatische Schraubanlage und Verfahren zur Kontrolle eines Schraubvorgangs
CN113090800B (zh) * 2021-05-12 2022-05-31 浙江伟山机械有限公司 一种具有自动断流功能的机械式阀门
CN113090801B (zh) * 2021-05-12 2022-06-03 盐城市精工阀门有限公司 一种可自动关闭的阀门

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3732934A (en) * 1969-08-28 1973-05-15 Aro Corp Fluid-driven tool with built-in work control mechanism
JP3373622B2 (ja) * 1993-10-26 2003-02-04 松下電工株式会社 インパクトレンチ
JP3264157B2 (ja) * 1995-12-01 2002-03-11 日立工機株式会社 回転打撃工具
US6205894B1 (en) * 1998-06-24 2001-03-27 Max Co., Ltd. Automatic stop device for screw striking machine

Also Published As

Publication number Publication date
JP2002264032A (ja) 2002-09-18
DE60227734D1 (de) 2008-09-04
KR100558495B1 (ko) 2006-03-07
EP1238757A3 (de) 2005-03-16
JP4457509B2 (ja) 2010-04-28
KR20020071468A (ko) 2002-09-12
EP1238757A2 (de) 2002-09-11

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