DE1603945A1 - Device for adjusting the tension in fasteners - Google Patents

Description

fatenianwali

Λ, -fiig. WiIiDlI

i / Mcm-i - 5082

RBBD INEläRNATIOiiAIi, INC., Houston, $ exas, '.tJ.S-.A

Device for adjusting the tension in fastening agent - · * ·.

The invention relates to a device for Adjusting the tension in fasteners and can e.g. used in motorized impact wrenches who · » d, en, used to power threaded fasteners, such as nuts, bolts and pipe connections or the like * serve «*

is a need for a new and improved voltage adjuster available, which can be used with an impact wrench that works automatically when Achieving a pre-set turn of the with a «thread provided ^ efeetigungsmittel the power supply to the Wrench switches off, ν

It is a further -öedürfnie for a new and improved adjustment or control device -available for an impact wrench, the means in provided with üewinde Üefestigungs · a "- gleichmäQi ^ ere t generated voltage and Klenunkräf and further easy to adjust and to operate 1st . There is also a need for a new and improved adjustable device for an impact wrench that will allow more uniform tension in a threaded fastener regardless of changes caused by friction, lubrication, or irregular or damaged threads on the fasteners or fasteners due to fluctuations in the power supply 2iii tool J-throws are »"'. ■ - ■' - ';"" .-. - _; ■ "'.;■.""" - ..; ^: ; ^: "-

" :: ■■. ^ V -; - ■■ ■■ '- ■ -; -: ■,;. ■■. ■ :: ■. Bad" 209821/0071

In particular, it has been found that what is needed is a new and improved adjustable control device for a rJo} ii.ag screwdriver that will tighten a threaded fastener to a certain predetermined initial torque, then allow a predetermined additional rotation of the fastener, and then automatically provide power to the tool switches off ο If the tool is removed from the workpiece or removed, the device automatically resets itself for the next similar work process «

Impact wrenches are known which are driven either electrically or pneumatically. The screwdrivers contain devices for turning a workpiece, for example a threaded holding device similar to a screw force further rotation _a

The invention is based on a motor-driven tool with a percussion device for driving a threaded fastener which contains a control device which enables the percussion device to exert an initial torque on the fastener. The invention consists therein that further devices are actuated by the control device to finalize the pulling of the fastener. control by automatically limiting the number of degrees or the angular extent by which the striking device can rotate the fastener _Λ _ ,

The invention will now also be illustrated with the aid of the accompanying illustrations eusfüh: -? l; .cft described, with all details emerging from the description and the .. 'figures or

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Features can contribute to the solution of the problem within the meaning of the invention and rait the will to patent in the Registration, have been included.

Show it:

Figure ^Ί a longitudinal section of an embodiment of the invention.

Figure 2 is a sectional view along the line 2-2 in Figure 1,

FIG. 3 is a sectional view along the line 3 - 3 in FIG.

only ¹ °. . . .

FIG. 4 shows a sectional view along the line 4-4 in FIG 1"

Figure 5 is a sectional view along the line 5-5 in Figure 1 » FIG. 6 is a sectional view taken along line 6-6 in FIG

Figure 7 is a view taken along line 7-7 in Figure I ₁ showing the rear head (partially removed) of the tool having an aperture for reading the motion setting for the control device

Figure 8 is an oblique view (partially schematic) of the Coupling part in a position in which the valve is opened * to engage the coupling control device get. ■

Figure 9 is an oblique view (partially schematic) of some Clutch parts that go through a specified arc angle after the clutch is engaged

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Figure 1o is a longitudinal son of a further embodiment of the invention,

FIG. 11 is a sectional view along the line 11-11 in FIG FIG. 1o, which shows a valve release member in a locked position.

FIG. 12 is a view similar to FIG. 11, but showing the Valve actuating member switched or actuated shown

Reference is now made to FIG. 1. The tool shown has a front housing 1, a middle housing 2 and a rear control housing 3. Inside the front housing 1 there is a plunger 4 which is rotatably mounted in a suitable bearing. The front end 5 of the plunger 4 has a square drive surface for attachment to a drive chuck or the like that can be connected to a workpiece. The plunger 4 has driven lugs 6 a rotor 8 and blades 9 comprises a hammer 10 is wedged within the rotor 8 and is rotatably supported thereby and driven by means of these wedges which enable the hammer to reciprocate in the rotor 8. A nook assembly 11 is disposed near the rear end of the hammer 1o. The hammer 1o welat driving lugs 1oa at its front end. A cam roller 12 is mounted in the rotor 8 for rotation therewith. The neck roll 1? can be brought into engagement with the cam assembly 11 in order to rotate the latter * and the cam assembly 11 is pushed forward by the cam roller 12 in order to close under certain operating conditions of the tool _; cause the hammer 1 ο moves forward and the driving lugs ioa exert a rotary blow on the driven lugs 6 of the plunger 4 ο after such a blow, a spring 13 leads the

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Hammer to return to the position shown in Figure 1, J5er Mot ^ r 7 is stored on suitable bearings, and it is a Compression spring 14 roped to the endgame or lixialapiel to catch the motor "

The Mittelgehäüse 2 has a drooping handle 15 on which a switching ^_element: includes Ηβ * actuates an inlet valve 17th The handle 1 $ is provided with a threaded base 13 for connection to a suitable 3ruokm ^ ttelqüeile (not shown) »

When you press the switching element 16, the valve 1? ι opened so that the pressure medium in the channel 19 may enter and from here € is ä by the Umsteuerven passed til 2o, which, if it is set for a Vörwärtadrehung of the tool, allowing the compressed air into the channel (see Figur5) and finally can enter the engine 7, whereupon the tuft escapes through openings 22 and then all openings 23 are drained.

Bine shaft 24 extending from the plunger 4 rearwardly away 'by the hammer and the motor and through the Nockehanördnunig 11, old which it is ally such that a certain amount of limited rotational movement ier Nockehanordnung 11 with respect to di e!''Hasten the formation of a "I <eerlauf" connection with this is present> The wavy ^ 24 is connected by a bolt 2> with the tappet Φ and the shaft 24 rotates jointly with the tappet 4 * The rear end of the shaft 24 is splined, like this shown at 25a * The rotor 8 has a "rearwardly extending" cylindrical part 26 "

Bas rear Sehäuse 3 has a Kupplungszyllnder 27, deir is not mounted within said housing rotatably * A Veniii.betätigungsteil: can 26 "is arranged xäid imierhalb of the clutch cylinder 27 while deraitt ea flat with respect to a limited SeIativdrehUng run" A

QiüGlUAL

Coupling sleeve 29 is mounted on the coupling cylinder 27 and arranged so that it can perform limited rotation with respect to this = An inflatable coupling arrangement 3o is provided and contains an inner sleeve 31 * derf-n "front end with the rear splined part 25a of the shaft 24 is keyed and rotates with that shaft - a compliant sleeve 33 is disposed substantially coaxially with the sleeve 31 and is secured to it by means of rings 34 to create an airtight seal between the ends of the compliant sleeve 33 and the sleeve 31. A coupling spindle 35 is mounted within the sleeve 31 and rests against the end of the shaft 24, the rear end of the spindle 35 extends to an Abeöhlufiplatte 36 and is secured within a cylindrical sleeve 37 in a sealed manner.

A clutch spring 38 is attached within the rear extension 26 of the rotor 8 stands. The other end of the clutch spring 38 has an axially extending tabs 41 'which extends into a slot 42 of the KupplungshUlse 29 (see FIGS θ and 9) φ A Blnatellring 43 iet within a counterbore .44 dea housing "3 attached. A “spiral” or clock spring 45 is arranged within the adjusting ring 43 and a band of the spiral spring 45 is attached to the adjusting ring 43 by means of a pin 46. The other band of the spring is secured within the slot 47 of the valve actuation actuator 28 (see Figure 4). The valve actuating part 28 has a stop pin 48 which extends away from it to the rear and is in contact with the Fortaatx 43a of the adjustment ring 43 (see FIG. 7) Clockwise preloads »sodaS de« ¹ pin 48-ßüfänglicn on which port set 43 & o rests

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As can be seen from Figure 4, eats in the äu. ^f 3eren periphery of a worm wheel 43 Einsfcellriiiges 49 out work te * A worm spindle is 5o * of the housing 3 is arranged within an opening 5 and fixed in the axial direction by a pin 52nd The worm spindle 5 Q can be actuated by means of an insertion screw or the like in order to rotate the ring 43 in various angular settings.

Reference is now made again to FIG. One valve is arranged within a bore 54 of the housing 3. The valve 53 is normally opened by a spring 55 held, which extends between the rear end of the valve and the end plate 36 to which it is fixed by means of a pin 56 "

A release pin 57 is in a bore 58 in the housing 3 installed, as can be seen from FIG pressed »which in turn by means of a cap screw 6o in The end 6t of the release pin 57 is in contact with a shoulder 62 on the valve 53. The release pin 57 is stepped down at 63 to make a ring shoulder 64 The valve actuating part 28 is provided with a driver 65 which, under certain tool operating conditions, comes into contact with the shoulder 64 '.

From iigur 2 it can be seen that the rear housing 3 has a bore 66 in which a valve chamber 67 is arranged. A valve 68 is installed in the valve chamber 67 and has an extension 69 which extends upwardly away from the valve. The valve 68 is slidable and sealed within the valve chamber 67, and a

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Peder 7o is between the lower end of the valves and one Retainer cap 71 placed around the valve normally in the upper position shown in Figure 2 to hold «The Coupling sleeve 29 has an upper shoulder 72 and a lower lug 73 * An adjustment pin 74 is in a hole 75 of the housing 3 is screwed in. As can be seen, the adjusting pin 74 is in contact with one side of the extension 72, and the upper pin ^ section 69 of the valve 68 is in contact with the other side of the approach 72o * The valve chamber 67 has an opening 76 through it which is in communication with a channel 77 which extended to the bore 54 of the valve 53. The housing 3 is Provided with an axially extending channel 78, which extends to the end plate 36 extends.

Reference is now made to FIG. 6. The axially extending one Channel 78 is plate with a channel 79 in the end 36 in connection, the channel 79 runs to the rear Part of the coupling spindle 35 «The coupling spindle 35 is provided with channels 8oy 81 and 82 which carry the print medium into "the interior of the sleeve 31 can lead" the sleeve 31 has through openings 83, which with the interior an elastic or resilient sleeve 33 are in connection "

The tool works as follows!

If it is desired to have a threaded fastener, like a nut or a screw, ~ «m · to close »so the switching element 16 is pressed, so that it must Example the ^ uökluft dusch äaä VefttiX 17 in the channel 19 * through daa l> m «teüeri ^ canal 21 etröraea

can * to turn the tool clockwise. When the otar 7 rotates, the rotor 8 takes the Cam roller 12 with, and the cam roller 12 engages in the

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209821/0071

Noökenanordnung 11 a 'which in turn is fixed to the shaft 24 for rotation therewith .. "' ^ The ¹ H Lie is pinned by means of the pin 25 with the plunger 4 so on. · -That when the Mot ov rotates, the plunger 4 and consequently the workpiece '' together with the motor 7 revolve, If a vorbe correct resistance to rotation of the workpiece occurs, the plunger 4, which is via the drive 5 and a chuck (not shown) in the usual way with the Workpiece is connected, slower The motor 7 continues the drive of the cam roller 12, whereupon it rolls over an elevation on the Jidcken arrangement 11, which has the consequence that the hammer 1 o moves forward and a Kingriff dei ^v driving lugs loa with the driven lugs 6 of the plunger 4 to exert a twisting blow on them 1 Position shown: when the coupling spring 58 returns, which is wound to the right and is accommodated within the rear rotor extension 26, it shifts in relation to the rear extension 26 _f because the rear end of the spring is held back against free rotation by being held back by the tab 4 ^{1 is} held, which is arranged in the slot 42 of the coupling sleeve 29 * which, however, can only perform a limited rotation in relation to the motor »

When the hammer zurückprellt, pielit and the rotor 8 au- rüok, as is the rear Porteatz 26 of the rotors 8 _O When the rotor strikes back 8 is moved calibration the Kupplungefed * r 38 with the rear Forteatz 26, wherein them as a one-way clutch operates, and on the lobes 41 / she moves further Me jCupplung3hülee 29 in a rearward direction "of the * is a iiichtung counter Uhrzeigereinno the Aneate 72 on the part of the rückwilrtigen Hülae 29 _t

209871 / ÖÖ71

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occurs in such a rebound in abutment with the plunger 69 of the valve 68. If such a rebound 6The check has reached a predetermined amount of movement, the projection 12 presses the valve 68 so far downwards that compressed air can flow through the channel 76 into the channel 77 , whereupon the compressed air holds the valve 68 in a lower position, which in turn has the consequence that the channel 78 is exposed to the compressed air. The _N channel 78 is in communication with the channel 79, which in turn is in communication with the channels So, 81, 82 and 83 of the spindle 35 and the sleeve 31, which enables the pressure medium to expand the flexible coupling sleeve 33 of the coupling arrangement 3o can o When the flexible coupling sleeve 33 expands, it comes in the interior of the valve actuating part 28 in friction contact with it · Since the coupling arrangement 3o is wedged by means of the wedge idea 25a old will 24? now causes the expansion de? JCoupling arrangement 3o, which is in engagement with the valve actuating part 28, that the valve actuating part 28 rotates with the shaft 24, which in turn rotates the plunger 4 Coupling arrangement 3o and the valve actuating part 28 together. When the workpiece is turning. continues, the valve actuation part 28 rotates by a variable number of degrees, whereupon the driver 65 on the valve actuation part 28 comes into contact with the shoulder 64 of the release pin 57 and lifts it off the shoulder 62 of the valve 53 (compare FIG. 5) * If the 4-way pen 57 is switched on in this way, the valve 53 is closed by the compressed air i »Werkseug, which overcomes the bias of the spring 55 and the tool is switched off. When the stop member 16 is released, the compressed air, which has widened the coupling arrangement 3o, can return BU atmospheric pressure »whereupon mlsth ά ± &

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Coupling arrangement 3o by itself from the valve operating part 28 solves so that the Spiralfeäer 45 can rotate the valve actuator counterclockwise until the Stop pin 48 on the actuating part 28 in contact with the Port set 43a of the adjustment ring 43 is "

The adjustment ring 43 can initially be adjusted in the middle of the tendon spindle 5o to the stop pin 48 and to set the extension 43a so that the various degrees of rotational movement are achieved after the expandable or inflatable clutch assembly 3o has been actuated as described above. From this it can be seen that the further the actuating part 28 and its driver 65 are adjusted counterclockwise before the expandable coupling is engaged, and so on these parts must run clockwise before the driver 65 switches the release pin 57.

In the tool shown, the area of the Angular movement of the control device after actuation of the expandable coupling from 0 to about 3oo urad »It becomes it should be noted that if a movement of more than 36o degrees is desired before the Auelöeeatift 57 is to be switched, a Spralnut arrangement for the stop pin 48 in the adjustment ring 43 can be used *.

Reference is now made to FIG. Depending on the desired extent of the initial pass time before the rebound of the impact device, as just described, actuates the expandable coupling, the Einatella screw 74 can be screwed in or out, namely Jenacli Wuneeh, uo a predetermined movement rebound d% s approach 12 too. allow before this scnalset the valve 68 ·, the predetermined torque on the

BATH 03! GIHAL

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the threaded fastener being tightened can be determined by noise or empirically, and after such seating or a predetermined torque of the workpiece has been established? It can then be empirically determined how far the workpiece needs to be rotated _f after this seat or the predetermined torque has been reached o If, for example, it is decided that the threaded workpiece should be rotated 180 degrees after the initial seat or that predetermined torque is reached »then the adjusting ring 43 is adjusted by the worm spindle 5o so that it rotates through-Ί.80 degrees» after the rebound of the device has actuated the valve 68 around the expandable coupling arrangement 3o In the example shown in FIG. 7, the numbers shown in FIG. 7 are subdivided into approximately 30 ° segments can rotate about 180 degrees after a predetermined torque has been reached and the expandable clutch assembly 3o has been engaged,

From the description it emerges that the tool shown according to the invention works like a conventional impact wrench until a predetermined resistance to rotation of the workpiece occurs, whereupon the device that responds to the rebound of the impact device _? A device sets in motion> which enables the workpiece to be rotated further by only a certain number of degrees from this predetermined seat to the final seat, this number of degrees being determined by adjusting the setting ring 43. After this rotation by a predetermined number of degrees has taken place, the tool switches off automatically. When the tool; on the workpiece is removed in order to carry out another similar work

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Operation to be carried out? the valve 16 is released, whereupon the compressed air in the tool is reduced to atmospheric pressure. If this is the case, the clutch arrangement 3ö detaches itself from the valve actuating part 28, whereupon the spiral spring 45 raised the valve return part counterclockwise - -. leads _t until the 4Ö message comes to rest on the port set 43a of the setting ring 4-3 ο

The device shown here * the * which controls the device in Be <· drive sets the rotation of the nut after an initial torque has been reached _f unmiirfcfelbJSr responsive to the rebound of the Schlagvörriehtung äaj ea is apparent _t that versGhiederie auJf ^ a Drehraömenij "änsprfeciiende Einridhtungen can be used, the Vorriohtungen tim in operation to setzfIi ₄ so Sine Ereimng the workpiece about a vörbestimmte öradzähi öiireiiht wirä, iiaöhdeni ^ ift 'vorbestiiämtes initial: torque is present "- ZUmv example, a SöhwUngräd on eiiiek cam er dör Riieköeitis the Schlagvorriöhtüiig befeötigt So that the flywheel moves in the axial direction on the crouch * when an initial moment of rotation has been reached * and this axial momentum of the flywheel can switch the valve 68 or actuate other devices in order to control it via the shafts §4 and din ram 4 ffiit your work piece to v efbijiaen * \

It is "rkennbasis, dÄß _f näehdem the pressure medium in the tool to atmospheric pressure has dropped and the

has rotated the driver 65 counterclockwise, the r-t ed # f te the Vörttil 68 in dl »i» Figüi ^v -t sweeps back _t and the Pfede ^ W bfiftgt dtft Äuiiöetltift in 3 ö «si * ig * ii i» äg «Isutuofe * To« equal

the spring 55 guides the valve 53 In. that shown in FIG Position back * which allows the tool for a work sequence reset as just described

It is to "11 and 12 Referring now to the figures, in which another embodiment of the invention is shown" the just described is generally similar and auehi similarly arbeiteto The main difference in the tu üMi figures exporting shown to 12 1o tion lies in the shut-off valve device. This embodiment has a rear housing 3 a, which has an adjusting knob solder that is attached to the housing by means of a closure plate io2. Within the housing 3 a, a locally open plucking cylinder 27a is installed α a. Kupplüngsfeder 38m is located within the rear zylindrisehen portion 26 of the rotor $ provided a Kupplungshülee 29a is unit on the coupling asylum Indian 27a over a (direction finding the Kupplungefeder 38a disposed _o the coupling sleeve 29a is bsi gifieiiiitfct 1œ3, Mr front cheap rate of the spring 38a is in tiiieEi äöfiüit * 16 $ * && * KopplunlÄz ^ linaers 27a fastened. The backward wS ^ tigft feil ä & t ? Ede ** 38a fet fastened within the SQÜlititi 1g3 of the coupling sleeve 29a «A valve actuation & part 28s set & vm execution of a controlled rotary movement arranged within the cylinder 27a.

In a bore 1o4 of the C-tube "a 3 &i" t a valve arrangement 1o5 rorg * 8th "n. The valve arrangement 1o5 vi a spring iä &% n. The valve arrangement shown in "Wiijga" has a rotatably mounted "107" because a spring 10 is pressed into the position shown in FIG. Da * Auelöeeglied 1o7 Hill on the occasion of * "old one iöhulter ttt% " t "" ^ Veötilhülee tfe * iis V "" til 1ö5 wtrd gift "!" one gin »teiiseh # & ttbe Itt eißg ** fc # iS * - Ue # .." is

209621/0071

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As shown in FIGS. 11 and 12, the housing 3a has a bore 112 in which a switching pin 113 is arranged o The rear end of the valve actuation part 28a is provided with an actuation pin 114 “In the setting shown is the knob 1o1 opposite to Turned clockwise until the pin is in the figure shown 11 is the position shown, this setting applies to a rotation of about 27o degrees after the coupling device due to a predetermined torque the threaded fastener has been actuated.

After the predetermined torque has been reached, the switching valve 68 is opened by a suture on the coupling sleeve 29a, whereupon the compressed air is fed to the channels 115 and 116 and to the interior of the inflatable or expandable coupling arrangement 3o via the spindle 35 in a manner would described above, whereafter, when the clutch assembly rotates, the stopper pin 114 comes into abutment with the end 117 of the switching pin 113 which is rotatably mounted Auslöaeglied 1o7 downwardly out of engagement with the shoulder 1o9 (see Figure 12) ₃ moves Then moves the air pressure in the tool, the valve 1o5 to right, the bias of the Fefter is overcome 1o6 to the Druckluftsufuhrzum tool disable "the switching member 16 is then released, and the tool is removed from the workpiece, whereupon the pressure medium in the w _he iczeug to atmospheric 3> ruok falls off. The spiral spring 45 then returns the valve actuation part 8a and the switching pin 114 carried by the latter to the position shown in FIG. The springs 1o6 and 1o8 also lead the valve io5 and the release member 1o7 back into the positions shown in Figure To, so that the release member 1o7 comes back into engagement with the shoulder 1o9 of the valve sleeve 11ο Ό

If one of the tools is operated in reverse or counter-clockwise direction, for example when removing the nut or the like, it is usually not desirable for the clutch control to puncture the first embodiment and the channels 115 and 116 of the second embodiment ₀ If it is set in a Umkehreteilung not exposed to the pressure means, the air channel 118 is exposed to the pressure agent _t to the motor in a reverse direction or counterclockwise direction to drive. (see Figure 5 ) ° The clutch arrangement 3c is therefore made ineffective when operating in a reverse direction. When operating in a reverse direction, the front end of the clutch spring 38 comes into engagement with the slot 4o by means of the tab 39. The slot 4o is located in the stationary coupling cylinder 27. The spring 38 is thereby held back against free rotation in the counterclockwise direction, and since this is a right-hand wound spring, the rear rotor extension 26 slides on the spring 38 "

From the above it can be seen that in one operation of the tool according to the invention clockwise tightened the workpiece to a predetermined torque and is beaten, and that when this predetermined torque is reached, a device is set in motion is, whereby the work piece in addition to a predetermined Angular number can be rotated, whereupon the tool is automatically switched off »when the tool is removed from the workpiece for the next similar operation the coupling device turns itself on

209821/0071

back to their original position * If so: is it? the Tool for loosening a nut or the like too. Use ^ the impact device of the tool comes into operation, in order to loosen or «to release such a fastener Loosen the clutch mechanism used to control the Rotary dimension of the nut is used when the tool is operated clockwise, but remains in / ineffective, if the tool works counterclockwise »

In summary, it is stated that the invention provides a new and improved adjustable control device for an impact wrench whereby, upon a predetermined resistance to rotation of the workpiece, the rebound of an impact device actuates a control device which rotates with the workpiece a predetermined number of degrees and then turns off the power to the tool and when the tool is removed from the workpiece it automatically resets itself for the next similar operation ₀

According to a further feature, the invention enables a fastener to be screwed and hammered into a seat position with any predetermined torque. After this initial torque reaches 1st, the rebound of the striker presses a Kupplungesteuervorrichtung, creating a zueHtzliöhe preselected rotation of Befestigungsini ttels permitted is "This has been a so-called" turn-of-the-nut "method known _a If this additional rotation executed If the tool is then removed from the workpiece, the control device automatically resets itself for the next similar operation.

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In other respects is a new and improved control device created for an impact wrench »by which a selected initial orehraonient range for one Workpiece can be set, after which the final tightening of the workpiece by turning O to about 36o degrees or more can be selected »

In particular, the invention provides a new and improved impact wrench operated by a pressure medium with a control device which has an elastic coupling device, which in turn by a predetermined The rebound of the striking member of the striking device is set in motion, as a result of which a workpiece is then attracted by a specified number of angular degrees, and which further comprises devices responsive to angular movement respond to the power supply to the tool switch off and also contains devices to reset the control device when the tool is off the workpiece is removed so that another one is more similar Operation can be repeated «,

The invention also provides an impact wrench a control device employing a "lurn-of-the-nut" method allows to move a workpiece in a forward direction to turn a predetermined number of angular degrees, and this screwdriver gives full power in one reverse direction of rotation from

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Claims (1)

«Λ9 160T9V5" P a t e η t a η β ρ r ti c h έ Motorized tool with an impact device to .Ant rub a threaded Bef it ti-. supply means that includes a control device that the Impact device enables an initial pre-determined To generate torque on the fastener, g e k e η η ζ e i c h η e t through another through the control device (27 uswo) actuated device (jo), the final tightening of the fastener controls by automatically limiting the number of degrees by which the striking device rotates the fastening means can. · 2 ο tool according to claim 1 _? gek β η η ζ eic Ii n β t du roh a device (43) sur preselection of the number of angular degrees around which the impact device rotates the fastening means for the final tightening. 3s tool according to claim 1 or 2 as ₉ By J ge h · k * η en% eic Ii n β ΐ ₉ characterized in that the further device (5ο) Äittel (28 _e 57 »55) _r entM2rt the AEL1" 8tiätlg the! .Eistungezufuhr sum Switch off the tool, sowing the fastener is rotated by a v © rl> eatimrate number of angular degrees » 4 c tool nacia one or mefererea of the preceding claims, ia ä ur eh. Se k "aaseicha"; t ₉ that the further device (5o) depending on a predetermined resistance to rotation Öes fastening device comes into function _o 5 c tool according to one or more of the preceding claims ge ke η η ζ ei leveled by the combination of its motor (7) and a spindle (24) set in circulation by this, the spindle (24) on the other 209821/0071 binding rait serves the fastening means, a first device (16) for controlling the flow of work medium to the motor (7), a second device (29 »75, 68) _p which enables the rotation of the spindle for tightening the fastening element to an initial preselected torque and one third device (3o) which is actuated by the second device and which controls the rotation of the spindle for securing the fastening device to a preselected level of final tightening strength. 6 η Motor-operated tool according to one or more of the preceding claims · with a compressed air motor »a rotatable sole-receiving device which can be connected to the fastening means, an impact feed device which exerts a series of rotary impacts on the receiving device, an actuating valve and a shut-off valve, characterized by a coupling device (3o etc.), which is assigned in terms of drive to the impact-absorbing device (4), in order to periodically carry out a relative rotary movement and a common rotary movement therewith; * to open the actuating valve (68), to actuate the coupling (3o etc.) and to produce a joint rotary movement of the same with the impact-absorbing device (4), and by means of a switching device (65 ), which is arranged so that l it switches the shut-off valve (53) when the achlagaufnahmende device has executed a rotation, among other things, a number of angular degrees after the clutch (3o etc.) is actuated. -. . ■ ■ BADORKjSNAL 209821/0071 7, Y / Erkeeug according to claim 6 »d ad ur ο h ge ken ns e 1 c η η et that the clutch device {3a etc. *} is pneumatically operated and can be actuated by devices (29s 68) which are timed to a certain extent a htiökpralle of the echla ^ transmitting device (to) to ^ speak " 8. Tool according to claim 6 or 7, ge ίε β η η β ei 0 h-η etdur ö η a device (2o _r HÖ)> which makes the coupling ineffective «when the tool is operated in a reverse Drehriohtungo 9ο tool according to one of claims 6, 7 or 9, g θ -ke η η e β i η · td U ro h an automatic device 5o, 45 U3Wo) sum Rücküokatellen the actuating valve C € 8) j of the Äbsciialtrentils ^ 53) and of the coupling <3o etc. "), if the sales are removed from the fasteners _{or similar} ίο. Tool according to one of claims 6-9, g β k β η n z β i ch η et dur ο h a device <4 3) for preselecting the angular degrees over which the coupling (Jo etc.) the impact-absorbing device (4) set in rotation / ■. ■ ■: V BÄDORK21NAL 209821/0071