US3657964A - Control system for nutsetter - Google Patents

Control system for nutsetter Download PDF

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Publication number
US3657964A
US3657964A US841354A US3657964DA US3657964A US 3657964 A US3657964 A US 3657964A US 841354 A US841354 A US 841354A US 3657964D A US3657964D A US 3657964DA US 3657964 A US3657964 A US 3657964A
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United States
Prior art keywords
valve
pressure
pressure fluid
motor
signal
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Expired - Lifetime
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US841354A
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English (en)
Inventor
William Workman Jr
James H Boeger
Robert E Bishop
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Gardner Denver Inc
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Gardner Denver Inc
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
    • B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
    • B23P19/06—Screw or nut setting or loosening machines
    • B23P19/065—Arrangements for torque limiters or torque indicators in screw or nut setting machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
    • B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
    • B23P19/06—Screw or nut setting or loosening machines
    • B23P19/069—Multi-spindle machines
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B25/00—Regulating, controlling or safety means
    • F01B25/26—Warning devices

Definitions

  • ABSTRACT A control system for a pneumatic multiple nutsetter which includes control valves operable to sense motive air pressure at each tool motor inlet port. In response to a predetermined motor inlet pressure the control valves operate to turn on visual indicators and to actuate pneumatic card perforating recording apparatus for registering the completion of a fastener torquing operation.
  • the control system includes pneumatic circuitry operable to shut off the motive air supply to deenergize the nutsetter after all individual motor units have completed their fastener torquing operations.
  • the system also includes circuitry operable to fail to deenergize the nutsetter of a motor does not reach the predetermined inlet pressure and to deenergize the nutsetter if any one motor reaches the predetermined inlet pressure prematurely.
  • Control systems are known in the art of fluid operated multiple fastener torquing tools which include visual indication of the tool operating condition.
  • Amtsberg et al disclose electrical control circuitry and indicators for indicating the completion of an operating cycle of a fastener tightening tool. It is desirable, however, to utilize the working fluid as a signal producing and control medium in fluid operated tools thereby simplifying the circuitry and eliminating the hazards to operators created by electrical circuits.
  • it is desirable toprovide control means for multiple nutsetter units which will positively identify the satisfactory or unsatisfactory operation of each individual tool operating cycle and to provide for shutoff of the complete unit if any one tool is inoperable at the onset of an operating cycle.
  • the present invention provides a control system for a pneumatic multiple unit'fastener tightening tool whichutilizes the working fluid to provide a visual indication andpermanent record of .the completion of a satisfactory operating cycle of each individual motor unit in the tool.
  • the control system of the present invention provides for actuating a pneumatic visual indicator and a pneumatic document perforating apparatus in response to sensing a predetermined pressure of the motive fluid at the motor inlet port of each individual motor.
  • the control system of thepresent invention further provides means for shutting off the supply air to a multiple spindle nutsetter in the event that any one individual tool motor stalls prior to a predetermined time period in an operating cycle. Indication and recording-of the prematurely stalled spindle is also provided.
  • control system for a pneumatic multiple unit nutsetter which is operable to vary the predetermined motor inlet pressure sensing value which operates to signal the completion of a fastener tightening operation.
  • FIG. I is a schematic diagram of the control system of the present invention.
  • the control circuitry shown in the drawing is represented largely by current U.S.A. Standard fluid power graphic symbols for components which are well known in the art of fluid control systems.
  • the numeral 10 generally designates a multiple spindle pneumatic powered nutsetter.
  • the nutsetter 10 comprises individual tool units 12 mounted on a frame 14.
  • the tool units 12 are of a general type well known in the art of fluid operated tools and comprise compressed air operated motors 16 adapted to rotatively drive spindles 18 to which are attached wrench sockets 20.
  • the tools 12 are operative to produce torque to drive threaded fasteners 22 to a predetermined degree of tightness in making up a mechanicaljoint represented by the members 24 and 26.
  • the motors 16 are operable to receive motive air by way of motor inlet passages 37 from a supply conduit 28 which in turn is operable to be in communication with a supply conduit 30 by way of a shutoff valve 32.
  • Conduit 30 is operable to receive a supply of compressed air at. constant pressure from a source, not shown.
  • the valve 32 as a typical example is a two position valve operable to be shifted to position a by a spring actuator 34 and to position b by a pneumatic actuator 36.
  • motor inlet pressure may be sensed and used as a signal to shut off the supply of motive fluid to the tool when a predetermined pressure valve at the motor inlet is achieved thereby controlling the torque output of a normally operating tool.
  • motor inlet pressure may also be used to effect the operation of indicating and recording means when a predetermined minimum torque value has been exerted on a threaded fastener.
  • valves 42 and 44 are similar in operating principle to the control valve disclosed in U.S. Pat. No. 3,493,056. That is, a preset pressure is operable to hold valves 42 and 44 in position a. When said preset pressure value is exceeded by the pressure at the inlet of motors 16 valves 42 and 44 are shifted to position b. Pressure air at the preset biasing pressure is supplied to the position a actuators of valves 42 and 44 by way of a pressure regulator valve 46 having a settable constant pressure output. Alternatively, a pressure regulator valve 48 may be in communication with the position a actuators of valves 42 and 44 by way of the two-position valve 50 and shuttle valve 52.
  • the control system of the present invention also includes a two-position servo valve 54 spring biased to position a and pressure air biased to position b.
  • the pressure air actuator of valve 54 is operable to receive a pressure signal at supply pressure from either valve 42 or 44 in position a, by way of a servo circuit comprising shuttle valve 56 and conduits 55, 57 and 58.
  • a two-position signal switching valve 60 having a spring bias to position a and a pressure air actuator for shifting to position b is also part of the control system.
  • Conduit 62 leading to the pressure air actuator of valve 60 includes a variable time delay device 64 which is operable to control the flow of pressure air to the actuator of valve 60.
  • the control system further includes a second servo valve 66 and a valve 68 both of which are pressure air actuated to be in both positions a and b.
  • a start valve 70 interposed in conduit 72 between the main supply conduit 30 and the position b actuator of valve 68.
  • the start valve 70 includes a manual actuator 74 for moving to position b, and is spring biased to position a.
  • a device known as an impulse valve designated by numerals 76 and 78 operates in response to receiving a pressure air signal from valve 70 to provide a momentary signal to shift valve 68 to position b after which impulse valve 76 shifts to position b blocking further supply of signal air from the start valve 70 and venting the position b actuator of valve 68.
  • a second manually actuated valve 80 is operable, when actuated to position b, to supply pressure air from conduit 30 to the position a actuators of valves 66 and 68.
  • the control system of FIG. 1 provides bimodal register means operable to indicate visually and to record the functioning or malfunctioning ofthe individual tools 12 as they are operated to tighten threaded fasteners to a predetermined degree of tightness.
  • Visual indicators 82 and 84 are respectively in communication with control valves 42 and 44 and are operable to turn on in response to said valves shifting to position b.
  • the indicators 82 and 84 are somewhat similar in operating principle to the fluid operated visual indicator disclosed in US. Pat. No. 3,372,501 to (LB. Greene and more particularly to the disclosure of U.S. Pat. No. 3,492,968 to W. Workman, Jr.
  • a third indicator 86 similar to indicators 82 and 84, is operable to receive a pressure signal from valve 54, in position a, to indicate the completion of operation of both tools 12.
  • the pressure air signals receivable by indicators 82, 84 and 86 are respectively operable to be transmitted to pressure fluid operated recording means 87 represented schematically in FIG. 1 by the single acting, spring return, actuators 88, 90 and 92.
  • the-actuators 88, 90 and 92 are operable to make machine readable perforations in a document such as a data processing card 94 or similarly a paper tape, not shown, by means of their respective perforating elements 91, 93 and 95. in so doing a record of the completion of operation is made for the individual tools 12 as well as a record that all tools, if operating normally, have completed torquing their respective fasteners to a predetermined degree of tightness.
  • the indicator and recording means is also operable to register the malfunction of each tool as will be described herein.
  • Valve 54 would be biased to position b by pressure air from a supply conduit 96 through either valve 42 or 44, in position a, and shuttle valve 56.
  • Indicators 82, 84 and 86 would be vented and off," and the perforating actuators 88, 90 and 92 would have their respective perforating elements retracted away from card 94.
  • the tool operator Upon applying the spindles 18 to the fasteners 22 the tool operator would actuate start valve 70 to position b providing pressure air to shift valve 68 to position b.
  • Valve 76 would only provide a momentary signal to valve 68 as pressure air, after a brief delay caused by time delay 78, would shift valve 76 to position b thereby precluding the continued biasing of valve 68 to position b by the operator holding valve 70 in position b. Shifting of valve 68 to position b provides pressure air from supply conduit 30, conduit 96, and conduit 98 through valve 66, in position a, to the actuator of valve 32 shifting same to position b. Valve 32 in position b provides for supply air to flow to motors 16 whereby the fasteners 22 are operated on to be tightened. Pressure air from valve 68 also flows through conduit 62 to the actuator of valve 60. However, a pressure signal of sufficient magnitude to shift valve 60 to position b is delayed by time delay 64.
  • valves 42 and 44 provide a pressure signal to the respective indicators 82 and 84 and, accordingly, to the respective document perforating actuators 88 and 90 operating same to perforate the card 94.
  • valves 42 and 44 have shifted to position b a pressure signal is no longer provided to hold servo valve 54 biased in position b.
  • the position b actuator of valve 54 is operable to vent through valve 42 or 44.
  • Valve 54 thereby shifts to position a and provides a signal from supply conduit 30 and conduit 98 to operate master indicator 86 and perforating actuator 92.
  • a pressure signal also flows through conduit 100 to hold valve 66 in position a and shift valve 68 to position 0 whereby the position b actuator of valve 32 is vented to atmosphere and valve 32 operates to position a to shut off flow of motive fluid to motors l6.
  • Orifice 99 prevents rapid loss of pressure through valve 80, in position a.
  • a time delay 102 retards the signal to shift valve 68 to position a to assure that equal torquing of all fasteners is accomplished.
  • time delay 64 would be set to provide an adequate pressure signal to shift valve 60 to position b before the shifting of any one of control valves 42 and 44 to position b.
  • a motor 16 or spindle 18 were locked due to a damaged tool component or fastener a motor inlet pressure sufficient to shift its respective control valve to position b would be quickly sensed due to the stalled condition of said motor. Accordingly, pressure air would flow through a second servo circuit comprising conduits 101 or 103, conduit 105, shuttle valve 104, and valve 60, the latter still in position a as a result of the delay in shifting to position b caused by time delay 64.
  • Pressure air from the control valve of the stalled motor would then operate to shift servo valve 66 to position b thereby venting the actuator 36 of valve 32 causing same to shut off motive air to the tools 12.
  • a pressure signal from the faulty tool would also operate to turn on its respective indicator and to record which tool had malfunctioned by means of its respective perforating actuator. Furthermore, pressure air could not be supplied to restart the motors without operator acknowledgment of the malfunction by actuation of reset valve 80 to position b.
  • the control system of the present invention also includes means for automatically changing the biasing pressure which operates to hold control valves 42 and 44 in position a in opposition to the pressure at the motor inlet ports.
  • the multiple spindle nutsetter 10 is typical of conventional nutsetters in the sense that normally all tool motors will not reach their maximum torquing effort or approach stalling simultaneously. Therefore, a motor may slow down or approach a stalling condition whereby less motive air is being consumed by that motor and consequently more motive air is now available at the inlet ports of the remaining motors which may still be driving their respective fasteners.
  • the reduced consumption of motive air caused by the aforementioned condition usually results in a momentary rapid increase or pulse of motive air pressure at the inlet ports of the motors which are still running. This momentary pressure increase is often sufficient to effect shifting of the respective control valves of the motors which are still running even though the motors themselves have not had the increased pressure imposed on them sufficiently long enough for proper torquing of their respective fasteners.
  • time delay means 64 is set to operate to shift valve 60 to position b before either valve 42 or 44 shifts to position b in a normal fastener tightening operation.
  • pressure air will flow through shuttle valve 104 and valve 60 to the pressure air actuator of valve 50 shifting same to position b.
  • Pressure regulator valve 48 which is set to produce a predetermined constant output pressure greater than the constant output pressure of regulator 46, will provide an increased biasing pressure supply through valve 50, in position b, and shuttle valve 52. Valves 42 and 44 will then have a greater biasing pressure operating to bias them in position a.
  • valves 42 or 44 Since one of valves 42 or 44 has already operated to position b to initiate the change in bias pressure as described above, a momentary reshifting of said one valve to position a may occur. However, said one valve has already operated to register a satisfactory predetermined torquing effort of its associated tool motor by means of the recording apparatus 87.
  • the motive air supply to the nutsetter 10 may be interrupted and the system reset to the condition at which a normal operating cycle begins.
  • Manual actuation of the reset valve 80 to position b operates to provide pressure air to actuate valves 66 and 68 to position a simulating, except for operation ofthe register means, the completion of a normal operating cycle by venting the actuator 36 of supply valve 32.
  • Valve 32 accordingly, shifts to position a shutting off the motive air supply to the motors 16.
  • the actuator of valve 60 is vented through valve 68 thereby returning valve 60 to position a.
  • the position b actuators of valves 42 and 44 are operable to be vented internally through motors 16 thereby providing for said valves to be biased to position a by regulated pressure air from valve 46.
  • control system of FIG. 1 is shown as being operable to control a multiple tool nutsetter having two individual tool units.
  • Those skilled in the art of designing fluid control circuits will appreciate that virtually any number of tool units may be controlled by the system of HO. 1 by the addition of a control valve, indicator, and perforating actuator for each additional tool unit.
  • additional shuttle valves may be suitably arranged in circuit with valve 56 and one another to provide a signal to the position b actuator of valve 54 as long as at least one tool has not reached the predetermined control valve position b shifting pressure. in a similar manner additional shuttle valves would be required to be in circuit with valve 104 to provide a signal to the position b actuator of valve 50 by way of valve 60.
  • a control system for a torque producing tool comprising a fluid operated motor, said motor having a fluid inlet passage;
  • torque responsive control means comprising a two-position valve operable to communicate pressure fluid from said pressure fluid supply to said visual indicator means, said valve including pressure fluid biasing means operable to receive a pressure fluid signal for biasing said valve in a first position, and said valve including pressure fluid actuator means in communication with said motor inlet passage and operable in response to receiving a predetermined pressure signal from said motor inlet passage corresponding to a predetermined torque produced by said tool and greater than said biasing pressure signal to shift said valve to a second position in opposition to said biasing pressure signal to provide a pressure fluid signal to said visual indicator means.
  • a control system for a torque producing tool comprising a fluid operated motor, said motor having a fluid inlet passage;
  • fluid operated recording means responsive to receiving a pressure fluid signal to record a predetermined torque produced by said tool
  • torque responsive control means comprising a two-position valve operable to communicate pressure fluid from said pressure fluid supply to said recording means, said valve including pressure fluid biasing means operable to receive a pressure fluid signal for biasing said valve in a first position, and said valve including pressure fluid actuator means in communication with said motor inlet passage and operable in response to receiving a predetermined pressure signal from said motor inlet passage corresponding to a predetermined torque produced by said tool and greater than said biasing pressure signal to shift said valve to a second position in opposition to said biasing pressure signal to provide a pressure fluid signal to said recording means.
  • a control system for a torque producing tool comprising a fluid operated motor, said motor having a fluid inlet passage;
  • fluid actuated register means responsive to receiving a pressure fluid signal to register a predetermined torque produced by said tool
  • torque responsive control means comprising a two-position valve operable to communicate pressure fluid from said pressure fluid supply to said register means, said valve including pressure fluid biasing means operable to receive a pressure fluid signal for biasing said valve in a first position, and said valve including pressure fluid actuator means in communication with said motor inlet passage and operable in response to receiving a predetermined pressure signal from said motor inlet passage corresponding to a predetermined torque produced by said tool to shift said valve to a second position: in opposition to said biasing pressure signal to provide a pressure fluid signal to' said register means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
US841354A 1969-07-14 1969-07-14 Control system for nutsetter Expired - Lifetime US3657964A (en)

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US84135469A 1969-07-14 1969-07-14

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US3657964A true US3657964A (en) 1972-04-25

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US841354A Expired - Lifetime US3657964A (en) 1969-07-14 1969-07-14 Control system for nutsetter

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US (1) US3657964A (enrdf_load_stackoverflow)
JP (1) JPS4830440B1 (enrdf_load_stackoverflow)
BE (1) BE744042A (enrdf_load_stackoverflow)
DE (1) DE2021737B2 (enrdf_load_stackoverflow)
ZA (1) ZA697724B (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3887160A (en) * 1970-09-18 1975-06-03 Sperry Rand Australia Ltd Fluid operated actuator for movable members
DE2541930A1 (de) * 1974-09-19 1976-04-01 Standard Pressed Steel Co Mehrstufige bolzen-anziehanordnung
US4170165A (en) * 1976-10-26 1979-10-09 Bascos Santiago A System for operation of gas controlled devices embodying an automatic programmable value sequencer adapted to cease operation upon the occurrence of a malfunction
DE29623659U1 (de) 1995-03-03 1999-04-08 Volkswagen Ag, 38440 Wolfsburg Vorrichtung zum Herstellen von Verschraubungen
DE29623664U1 (de) 1995-12-11 1999-04-08 Volkswagen Ag, 38440 Wolfsburg Fertigungseinrichtung zum Herstellen eines Gegenstandes
DE29623660U1 (de) 1995-12-11 1999-04-15 Volkswagen Ag, 38440 Wolfsburg Vorrichtung zum Herstellen von Verschraubungen
DE19650926B4 (de) * 1995-12-11 2005-09-15 Volkswagen Ag Verfahren zur Ausführung mindestens einer Verschraubung
DE19606381B4 (de) * 1995-03-03 2005-10-13 Volkswagen Ag Verfahren zur Ausführung mindestens einer Verschraubung an einem Gegenstand
DE19650927B4 (de) * 1995-12-11 2005-10-13 Volkswagen Ag Verfahren zum Herstellen von Gegenständen mit mindestens einer Verschraubung
US20080251558A1 (en) * 2007-04-12 2008-10-16 Makita Corporation Driving power tool

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6047072B2 (ja) * 1981-12-25 1985-10-19 株式会社日本製鋼所 スタツドテンシヨニング装置の群制御装置

Citations (12)

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US1354948A (en) * 1919-06-06 1920-10-05 Brock George Lois Gear-shift
US2707940A (en) * 1953-07-17 1955-05-10 Zoltan Faber Valve mechanism
US2887093A (en) * 1956-10-18 1959-05-19 Cabot Shops Inc Hydraulically operated pumping apparatus
US3129645A (en) * 1962-05-02 1964-04-21 Double A Prod Co Electrically modulated fluid valve
US3180612A (en) * 1962-09-26 1965-04-27 Ingersoll Rand Co Torque tools
US3217603A (en) * 1962-05-25 1965-11-16 Dowty Mining Equipment Ltd Mining apparatus
US3259025A (en) * 1963-02-02 1966-07-05 Kessler Leo Rotary impact tool
US3322205A (en) * 1965-04-07 1967-05-30 Chicago Pneumatic Tool Co Automatic recycling nut runner
US3406762A (en) * 1967-05-12 1968-10-22 Ingersoll Rand Co Control apparatus for fluid powered tools
US3480087A (en) * 1968-02-20 1969-11-25 Gardner Denver Co Fluid operated tool with pressure indicator
US3493056A (en) * 1968-05-16 1970-02-03 Gardner Denver Co Fluid operated tool
US3505928A (en) * 1967-07-21 1970-04-14 Stanley Works System for performing tool operation and signaling completion thereof

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1354948A (en) * 1919-06-06 1920-10-05 Brock George Lois Gear-shift
US2707940A (en) * 1953-07-17 1955-05-10 Zoltan Faber Valve mechanism
US2887093A (en) * 1956-10-18 1959-05-19 Cabot Shops Inc Hydraulically operated pumping apparatus
US3129645A (en) * 1962-05-02 1964-04-21 Double A Prod Co Electrically modulated fluid valve
US3217603A (en) * 1962-05-25 1965-11-16 Dowty Mining Equipment Ltd Mining apparatus
US3180612A (en) * 1962-09-26 1965-04-27 Ingersoll Rand Co Torque tools
US3259025A (en) * 1963-02-02 1966-07-05 Kessler Leo Rotary impact tool
US3322205A (en) * 1965-04-07 1967-05-30 Chicago Pneumatic Tool Co Automatic recycling nut runner
US3406762A (en) * 1967-05-12 1968-10-22 Ingersoll Rand Co Control apparatus for fluid powered tools
US3505928A (en) * 1967-07-21 1970-04-14 Stanley Works System for performing tool operation and signaling completion thereof
US3480087A (en) * 1968-02-20 1969-11-25 Gardner Denver Co Fluid operated tool with pressure indicator
US3493056A (en) * 1968-05-16 1970-02-03 Gardner Denver Co Fluid operated tool

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3887160A (en) * 1970-09-18 1975-06-03 Sperry Rand Australia Ltd Fluid operated actuator for movable members
DE2541930A1 (de) * 1974-09-19 1976-04-01 Standard Pressed Steel Co Mehrstufige bolzen-anziehanordnung
US4170165A (en) * 1976-10-26 1979-10-09 Bascos Santiago A System for operation of gas controlled devices embodying an automatic programmable value sequencer adapted to cease operation upon the occurrence of a malfunction
DE29623659U1 (de) 1995-03-03 1999-04-08 Volkswagen Ag, 38440 Wolfsburg Vorrichtung zum Herstellen von Verschraubungen
DE19606381B4 (de) * 1995-03-03 2005-10-13 Volkswagen Ag Verfahren zur Ausführung mindestens einer Verschraubung an einem Gegenstand
DE29623664U1 (de) 1995-12-11 1999-04-08 Volkswagen Ag, 38440 Wolfsburg Fertigungseinrichtung zum Herstellen eines Gegenstandes
DE29623660U1 (de) 1995-12-11 1999-04-15 Volkswagen Ag, 38440 Wolfsburg Vorrichtung zum Herstellen von Verschraubungen
DE19650926B4 (de) * 1995-12-11 2005-09-15 Volkswagen Ag Verfahren zur Ausführung mindestens einer Verschraubung
DE19650927B4 (de) * 1995-12-11 2005-10-13 Volkswagen Ag Verfahren zum Herstellen von Gegenständen mit mindestens einer Verschraubung
US20080251558A1 (en) * 2007-04-12 2008-10-16 Makita Corporation Driving power tool
US7854360B2 (en) * 2007-04-12 2010-12-21 Makita Corporation Driving power tool having a control circuit

Also Published As

Publication number Publication date
BE744042A (fr) 1970-06-15
DE2021737B2 (de) 1973-11-08
ZA697724B (en) 1971-06-30
DE2021737C3 (enrdf_load_stackoverflow) 1974-06-06
JPS4830440B1 (enrdf_load_stackoverflow) 1973-09-20
DE2021737A1 (de) 1971-02-04

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