EP0468859A1 - Schraubwerkzeug mit voreinstellbarem Anzugsmoment - Google Patents
Schraubwerkzeug mit voreinstellbarem Anzugsmoment Download PDFInfo
- Publication number
- EP0468859A1 EP0468859A1 EP91402002A EP91402002A EP0468859A1 EP 0468859 A1 EP0468859 A1 EP 0468859A1 EP 91402002 A EP91402002 A EP 91402002A EP 91402002 A EP91402002 A EP 91402002A EP 0468859 A1 EP0468859 A1 EP 0468859A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- adapter
- screwdriver
- sleeve
- screwing
- sliding part
- 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.)
- Granted
Links
Images
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
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
- B25B21/002—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose for special purposes
-
- 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
- B25B23/141—Mechanical overload release couplings
-
- 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
- B25B23/1415—Break members; Arrangements specially adapted for break-bolts
Definitions
- the present invention relates to a screwing tool with predetermined tightening torque.
- the tool according to the invention is more particularly intended for clamping connecting members on parts to be assembled, requiring the use of two tightening torques.
- This is, for example, the case when it is desired to assemble at least two plates or the like between which a polymerizable interposing resin, such as a putty, is placed in particular for anticorrosive purposes.
- a polymerizable interposing resin such as a putty
- screwdrivers which include a declutching mechanism provided in particular with a compression spring.
- the latter is housed in a hollow cylindrical sleeve of the screwdriver and determines the value of the disengaging torque for the motor shaft of the screwdriver.
- the adjustment of the spring is carried out continuously by a displaceable ring acting against the spring, avoiding the use of auxiliary tools.
- the setting of the compression spring may accidentally change during the screwing operation, either by an involuntary rotation of the adjusting ring, or because of the vibrations generated by the screwdriver.
- the object of the present invention is to remedy these drawbacks and relates to a screwing tool with predetermined tightening torque, in particular intended for the application mentioned previously, allowing rapid and automatic adjustment of the setting of said compression spring to the desired tightening torque, without risk of errors and without using additional tools.
- the screwdriving tool with predetermined tightening torque of the type comprising a screwdriver provided with a declutching mechanism, which in particular comprises a compression spring housed in a hollow cylindrical sleeve of the screwdriver and determining the value of the torque clutch for the shaft of the screwdriver motor, is remarkable, according to the invention, in that it comprises a sliding part housed in said sheath and traversed by said drive shaft, said part being accessible from the outside said sheath and being capable of acting against said spring, and in that it comprises at least one screwing adapter provided with a transmission capable of engaging in said driving shaft of the screwdriver, a first end of said adapter being capable of cooperating with a connecting member to be tightened, while the second end of said adapter is capable of cooperating with said sleeve by acting against ladi the sliding part which then compresses said spring to a predetermined compression threshold corresponding to the value of the tightening torque to be exerted on said connecting member by means of said transmission
- At least two screwing adapters can be mounted separately on the screwdriver, each adapter, when mounted on the sleeve of the screwdriver, compressing the compression spring, by means of said sliding part, by a value corresponding to a specific tightening torque.
- the adjustment of the calibration of said spring is carried out simply by changing the adapter on the screwdriver. Consequently, it is then possible to have a plurality of adapters, each of which, when mounted on the screwdriver, compresses the spring by a determined value, then corresponding to a specific tightening torque.
- said sliding part has a cylindrical shape cooperating with the inner wall of said sleeve and it has a transverse bottom, which is provided with an orifice for the passage of said screwdriver shaft and against which is likely to come apply said adapter, and a cylindrical skirt extending said bottom and surrounding said compression spring.
- said sliding part housed in the sleeve, has an annular shape whose axial orifice allows the passage of the drive shaft of the screwdriver, said adapter being capable of being applied against the face front of the annular sliding part, which acts, by its rear face, against said compression spring.
- said sliding part subjected to the action of said compression spring, is held axially in said sheath by retaining means.
- said compression spring when said cylindrical sliding part is held by its lugs against said ring, said compression spring is compressed to a value corresponding to a determined tightening torque.
- the screwdriver initially offers a predetermined tightening torque without having to act directly on the sliding part by means of an adapter, its second end coming close to the bottom, facing outwards, of the sliding part.
- said ring is mounted by screwing on the outer periphery of said sheath and bears against a stop integral with said sheath.
- a needle stopper is interposed between said sliding part and the corresponding end of said compression spring.
- connection of the second end of said screwing adapter to said sleeve of the screwdriver is effected by screwing and the transmission connection, provided in said adapter, to said drive shaft, is effected by engagement from the polygonal end of said transmission in a corresponding hole provided in said drive shaft.
- said adapter advantageously consists of a body inside which said transmission is arranged, the first end of the body being provided with a screwdriver bit driven in rotation by said transmission and capable of cooperate with said connecting member to be screwed, while the second end of the body is defined by a removable socket capable of being applied by its end face against said sliding part.
- said screw adapter has a 90 ° bent shape so that the axis of rotation of the first end of said adapter is offset parallel to the drive shaft of said screwdriver, said transmission connecting the first end of the adapter to the screwdriver then being bent.
- the screw-in connecting member intended for the assembly of plates or the like between which a polymerizable resin may be interposed, is of the type comprising a screw and a nut, the latter being capable of be rotated by said tool and having two superimposed polygonal parts, connected to each other by a zone of least resistance.
- the first end of one of the screwing adapters is shaped to engage in the two polygonal parts of said nut in order to tighten the connecting member to a first tightening torque
- the first end of the other adapter is shaped to engage in the polygonal part preceding the zone of least resistance of said nut, in order to tighten the connecting member to a second tightening torque, greater than the first, and cause the rupture of the zone of least resistance of said nut nut.
- means for ejecting the sectioned polygonal part of the nut may be provided in the first end of the screwing adapter.
- Figure 1 is a partial longitudinal sectional view of a first embodiment of said tool according to the invention, comprising a screwdriver with which can be associated in this case one or the other of the two screwing adapters shown.
- Figure 2 shows in longitudinal section the mounting of one of the screwing adapters shown in Figure 1 on the sleeve of the screwdriver, determining a first specific tightening torque.
- FIG. 3 shows in longitudinal section the mounting of the other screwing adapter shown in FIG. 1 on the sleeve of the screwdriver, determining a second specific tightening torque, in this case greater than the first.
- Figures 4A, 4B, 4C and 4D schematically show the different stages of screwing a specific type of connecting member to assemble two plates, using the screwdriver on which the two screw adapters are successively mounted.
- Figure 5 is a partial longitudinal sectional view of a second embodiment of said tool according to the invention, comprising, analogously to Figure 1, a screwdriver with which can be associated one or the other of the two screw adapters shown.
- the screwing tools shown with predetermined tightening torque, comprises a screwdriver 1, the body 2 of which is extended by a hollow cylindrical sheath 3 by means of a screw connection 4.
- a motor not illustrated, is provided in the body 2 of the screwdriver 1, being capable of causing rotation of a drive shaft 5 about a longitudinal axis 6.
- the hollow cylindrical sheath 3 surrounds, coaxially, the drive shaft 5 by delimiting with the latter a circular passage 7.
- a disengaging mechanism 8 which comprises, in known manner, a compression spring 9 and an arrangement of rollers 10 ensuring the friction connection between the drive shaft and the engine.
- This compression spring 9 is housed in the passage 7 of the hollow cylindrical sheath 3 surrounding the drive shaft 5 and it determines the value of the declutching torque of the shaft 5 of said motor of the screwdriver. Consequently, the calibration of said compression spring 9 contributes to determining the value of the tightening torque of the screwdriver corresponding to the value of the disengaging torque.
- the spring setting is thus a function of the screw adapter used which acts directly on the spring via the sliding part accessible from the outside. Consequently, the adjustment of the calibration of said spring, helping to determine the declutching torque of the motor of said drive shaft and, therefore, the tightening torque to be exerted, is carried out without an auxiliary tool, by simply mounting on the screwdriver the chosen adapter.
- the sliding part 12 is cylindrical and it comprises a cylindrical lateral skirt 12A cooperating, by sliding, with the wall 7A of the cylindrical passage 7 of said sheath 3 and terminated at one end by a transverse bottom 12B. This is pierced with an orifice 12C for the passage of the drive shaft 5 and this bottom is located near the outside of the screwdriver so as to be thus accessible by each adapter.
- the compression spring 9 of the declutching mechanism 8 of the screwdriver 1 bears against the bottom transverse 12B of the workpiece by means of a needle stopper 16, while the other end of the spring is applied against a shoulder a connecting piece 8A of said declutching mechanism 8.
- the spring 9 is thus housed in the sliding piece 12.
- means 18 are provided for retaining the latter.
- these means 18 can be constituted by radial lugs 12D extending outwards the other end of the skirt 12A, opposite the transverse bottom 12B, and passing through oblong slots 3A formed in correspondence in the sheath 3.
- the lugs 12D radials are regularly spaced from each other by partial longitudinal slots 12E formed in the cylindrical side skirt 12A of the part 12. This is made of a material with high elastic limit to allow the part to be mounted in the sheath.
- the radial lugs 12D are then applied, in the position illustrated in FIG. 1, against a ring 19 which is mounted, by screwing, on the external periphery 3C of the sleeve 3. This displaceable ring bears against a stop 20 secured to the scabbard 3.
- the spring 9 is compressed by the sliding part 12 held axially in the sheath by the cooperation of the radial lugs 12D with the ring 19 which thus acts as initial adjustment of the calibration of said spring.
- the compression of the spring 9 corresponds to a value of the declutching torque of the motor shaft of the screwdriver, corresponding to a determined tightening torque.
- each adapter 14 and 15 consists of a body, respectively 14B and 15B, inside which the transmission 14A or 15A is arranged.
- the first end 14C of its body 14B is provided with a screwing tip 14D rotated by the transmission 14A and capable of cooperating with the connecting member to be screwed on an assembly, while the second end 14E of the body is defined by a removable socket 14F capable of being mounted on the sleeve 3 of the screwdriver 1.
- the first end 15C of its body 15B is provided with a screwing tip 15D rotated by the transmission 15A and capable of cooperating with the connecting member to be screwed, while that its second end 15E is defined by a removable socket 15F capable of being mounted on the sleeve 3 of the screwdriver 1.
- Each socket 14F or 15F is mounted, on one side, by means of a screw connection 14G or 15G in the body 14B or 15B of its adapter.
- each of the sockets has a thread 14H and 15H respectively intended to cooperate with a thread 7B formed at the entrance to the wall 7A of the passage 7 of said sheath 3.
- each transmission 14A or 15A has an end with a polygonal section 14A1 or 15A1, for example hexagonal (or then a grooved end), intended to engage in a bore of corresponding section 5A, provided in the drive shaft. 5, which ensures a perfect bond.
- each adapter 14, 15 is bent at 90 ° so that the axis of rotation of the end piece, respectively 14D and 15D, is offset parallel to the longitudinal axis 6 of the drive shaft 5. It goes without saying that the body could extend coaxially with the shaft 5. Thus, in the illustrated case, each transmission 14A and 15A is bent. Such an embodiment of each of the transmissions, although it is not shown, does not raise difficulties.
- screwdriver bits 14D and 15D which can be driven in rotation by their respective transmissions, have different screwing depth depths 14D1 and 15D1. This is due to the fact that the tool shown is more particularly intended to screw specific connecting members, as will be seen with reference to FIGS. 4A to 4D. Obviously, the screwdriver bits could be identical.
- FIGS. 2 and 3 The mounting of the adapters 14 and 15 on the screwdriver 1 is illustrated in FIGS. 2 and 3, and presents no difficulties.
- the end 14A1 of the transmission engages in the bore 5A of the drive shaft of the screwdriver, simultaneously with the screwing of the thread 14H of the sleeve 14F in the thread 7B of the sleeve.
- the spring 9 is already prepared by the sliding part 12, held by its lugs 12D which are applied against the ring 19, the end face 14J of the sleeve comes flush with the bottom 12B of the part, while that an external annular shoulder 14K of the sleeve is applied against the end face 3B of the sleeve.
- the 14D tip is likely to provide then a first tightening torque corresponding to the disengaging torque of the mechanism itself imposed by the calibration of the compression spring.
- Such a tool is for example intended for fixing connecting members 21, such as that shown in FIG. 4A.
- Two plates 22 and 23 are intended to be assembled by means of these connecting members. Between these plates is interposed a polymerizable resin 24. Consequently, it is necessary in this case to tighten the connecting member 21 to a first tightening torque, then, after the polymerization of the resin, to carry out a final tightening of the member has a second tightening torque, greater than the first.
- the connecting member 21 comprises a screw 25, the head 25A of which is applied against the external face 22A of the plate 22, and a nut 26 intended to be screwed onto the screw 25 to apply against the outer face 23A of the plate 23.
- This nut 26 then advantageously comprises and in a known manner two hexagonal parts 26A and 26B superimposed and connected to each other by a zone of least resistance 26C.
- the screwing adapter 14 being mounted on the sheath 3 of the screwdriver 1, the imprint 14D1 of its rotary endpiece 14D is engaged around the two parts 26A and 26B of the nut, as shown in FIG. 4B.
- the tightening torque provided by the end piece, via the transmission 14A, and given by the calibration of the spring, is substantially similar to the theoretical breaking torque for breaking the two parts of the nut. But, as the end piece 14D traps the two parts of the nut, the rupture of the nut does not occur.
- the base 26D of the nut 26 is then pressed against the outer face 23A of the plate.
- the adapter 14 is dismantled from the screwdriver in order to arrange the adapter 15, the tightening torque of which can be provided by its nozzle 15D is greater than the previous one.
- the imprint 15D1 of the end piece less deep than that 14D1, only covers the part 26B of the nut, so that, when the tool is actuated, the torque of tightening delivered by the end-piece leads to the rupture of the zone of least resistance 26C and the tightening of the final torque of the connecting member 21 on the plates 22 and 23.
- Figure 4D shows the connecting member 21 after rupture of the part 26B of said nut.
- ejection means 28 consisting for example of a rod 28A, mounted coaxially with the axis of rotation of the nut. In this way, when acting on the rod, the end face 28B causes the broken part 26B to be ejected from said nut.
- a spring not shown, recalls the rod in position.
- the tooling according to the invention can be applied to any type of connecting member, the adjustment of the tightening torque being obtained simply by mounting the appropriate adapter, thereby avoiding the risks of error and guarantees reliable serial work.
- the sliding piece 112 has an annular shape.
- the annular part 112 is housed in the sheath 3 of the screwdriver 1 and its axial orifice 112A authorizes the mounting of the part around the drive shaft 5 of the motor of the screwdriver.
- the rear face 112B of the annular part is in contact with the compression spring 9, by means of the needle stop 16, while the front face 112C, turned towards the outside of the sheath, is in contact, in this case , retaining means 18.
- These means 18, which axially hold the annular sliding part 112 subjected to the action of the spring 9, comprise, in this second embodiment, a ring 18A threaded at its periphery 18B, which is thus screwed in the corresponding thread 7B provided in the internal wall 7A of the sleeve 3. Furthermore, the ring 18A is provided with an axial hole 18C, the diameter of which is such that it allows, in addition to the passage of the drive shaft 5 of the screwdriver, but also the passage of the end piece of each adapter between said shaft and the wall internal 18C1 delimiting the hole 18C of the ring.
- the screwing of the ring 18 in the sleeve 3 consequently causes the compression of the spring 9 by means of the sliding part 112, so that, as in the previous example, the axial position of the ring 18 can be adjusted initially. relative to the sleeve 3 to initially prepare the spring 9 to a compression value corresponding to a predetermined tightening torque.
- a locking element is provided, such as a screw 18D, for braking the ring in the tapped wall 7B of the sleeve.
- a radial slot 18E is formed in the ring separating it, at this location, into two parts 18A1 and 18A2.
- a tapped hole 18F In the part 18A1 is provided a tapped hole 18F, parallel to the axial hole 18B, which receives the screw 18D.
- FIG. 5 there is shown in FIG. 5, but partially, the two adapters 14 and 15 capable of being mounted individually on the screwdriver 1.
- the adapter 14 is screwed by the thread 14H of its end piece 14F in the thread 7B of the sleeve, so that its face 14J comes flush with the threaded ring 18A fixed inside the sleeve. Simultaneously, the end 14A1 of the transmission 14A of the adapter engages in the hexagonal bore 5A of the drive shaft.
- the screwdriver is capable of tightening the connecting members 21 to a first tightening torque corresponding to the initial compression of the spring.
- the length of the thread 15H of the sleeve 15F of the adapter 15 is identical to the length of the thread 14H.
- the end face 15J of the sleeve is extended by an annular cylindrical element 15L which is linked to the socket and which engages between the drive shaft 5 of the screwdriver and the internal wall 18C1 of the ring 18A. The length of the cylindrical element 15L is determined to compress the spring with an appropriate stroke.
- the element 15L acts progressively on the front face 112C of the annular piece 112 which then compresses the spring 9.
- the end 15A1 of the transmission 15A of the adapter 15 engages in the drive shaft 5 of the screwdriver.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9009520A FR2665096B1 (fr) | 1990-07-25 | 1990-07-25 | Outillage de vissage a couple de serrage predeterminable. |
FR9009520 | 1990-07-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0468859A1 true EP0468859A1 (de) | 1992-01-29 |
EP0468859B1 EP0468859B1 (de) | 1994-06-08 |
Family
ID=9399099
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19910402002 Expired - Lifetime EP0468859B1 (de) | 1990-07-25 | 1991-07-17 | Schraubwerkzeug mit voreinstellbarem Anzugsmoment |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0468859B1 (de) |
DE (1) | DE69102360T2 (de) |
FR (1) | FR2665096B1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3061056A1 (fr) * | 2016-12-28 | 2018-06-29 | Safran Nacelles | Embout de vissage pour outil de vissage et outil de vissage comportant un tel embout |
CN115091174A (zh) * | 2022-06-22 | 2022-09-23 | 江西中发天信航空发动机科技有限公司 | 一种发动机轴及轴承安装座自动拧紧装置及方法 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR982347A (fr) * | 1949-03-04 | 1951-06-08 | Machine rotative notamment pour visser ou dévisser les vis, écrous ou organes analogues | |
DE1628079A1 (de) * | 1967-01-31 | 1971-06-09 | Licentia Gmbh | Zum Schrauben oder Bohren geeignetes Getriebe |
DE3342880A1 (de) * | 1983-11-26 | 1985-06-05 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Kupplung fuer elektrowerkzeuge |
US4538483A (en) * | 1983-07-18 | 1985-09-03 | V.S.I. Corporation | Fastener wrenching means |
EP0272209A2 (de) * | 1986-12-17 | 1988-06-22 | HILTI Aktiengesellschaft | Handgerät |
EP0297041A2 (de) * | 1987-06-20 | 1988-12-28 | HILTI Aktiengesellschaft | Handgerät |
-
1990
- 1990-07-25 FR FR9009520A patent/FR2665096B1/fr not_active Expired - Lifetime
-
1991
- 1991-07-17 EP EP19910402002 patent/EP0468859B1/de not_active Expired - Lifetime
- 1991-07-17 DE DE1991602360 patent/DE69102360T2/de not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR982347A (fr) * | 1949-03-04 | 1951-06-08 | Machine rotative notamment pour visser ou dévisser les vis, écrous ou organes analogues | |
DE1628079A1 (de) * | 1967-01-31 | 1971-06-09 | Licentia Gmbh | Zum Schrauben oder Bohren geeignetes Getriebe |
US4538483A (en) * | 1983-07-18 | 1985-09-03 | V.S.I. Corporation | Fastener wrenching means |
DE3342880A1 (de) * | 1983-11-26 | 1985-06-05 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Kupplung fuer elektrowerkzeuge |
EP0272209A2 (de) * | 1986-12-17 | 1988-06-22 | HILTI Aktiengesellschaft | Handgerät |
EP0297041A2 (de) * | 1987-06-20 | 1988-12-28 | HILTI Aktiengesellschaft | Handgerät |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3061056A1 (fr) * | 2016-12-28 | 2018-06-29 | Safran Nacelles | Embout de vissage pour outil de vissage et outil de vissage comportant un tel embout |
WO2018122499A1 (fr) * | 2016-12-28 | 2018-07-05 | Safran Nacelles | Embout de vissage pour outil de vissage et outil de vissage comportant un tel embout |
CN115091174A (zh) * | 2022-06-22 | 2022-09-23 | 江西中发天信航空发动机科技有限公司 | 一种发动机轴及轴承安装座自动拧紧装置及方法 |
CN115091174B (zh) * | 2022-06-22 | 2023-04-25 | 江西中发天信航空发动机科技有限公司 | 一种发动机轴及轴承安装座自动拧紧装置及方法 |
Also Published As
Publication number | Publication date |
---|---|
EP0468859B1 (de) | 1994-06-08 |
FR2665096A1 (fr) | 1992-01-31 |
DE69102360D1 (de) | 1994-07-14 |
FR2665096B1 (fr) | 1992-11-06 |
DE69102360T2 (de) | 1994-11-03 |
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